CN101956985A - Sufficient utilization of garbage heat resource - Google Patents
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The invention provides the sufficient utilization of garbage heat resources. Because the heat of burnt garbage belongs to low-quality energy, if the low-quality energy is converted into high-energy-quality electric energy according to a heat engineering principle, the recovery rate of garbage heat must be lower, and the garbage heat resources can not be sufficiently used; but if the burnt high-temperature smoke gas is firstly heated to support the combustion of air and then is introduced into a single drying tower to dry sludge through a spray drying technology, then, the low-temperature smoke gas is introduced into a rotary kiln to dry moist domestic garbage, and the sufficient utilization of the garbage heat resources belongs to same-quality heat conversion, thereby the heat resources of the burnt garbage can be sufficiently used. The heat engineering calculation indicates that the utilization rate of the heat resources is 3 times higher than that of a garbage power technology.
Description
Technical field under in the of 1
How to make full use of the problem of contained heat resources in the rubbish when the invention belongs to waste incineration, P.86, the principle [1] that only can partly be converted into high-quality energy according to thermal technology principle low-quality energy in the heat conversion process proposes and illustrates the current technological process of extensively adopting configuration garbage power system in the incineration treatment of garbage process and unreasonable, has the very important disadvantages of the seldom calorimetric amount resource that only can regain in the rubbish in this garbage incineration process flow process.In this specification and further point out for example to starch if adopts flue gas after the waste incineration behind warm-up combustion-supporting air, to introduce in the mud slurry drying tower oven dry mud again, and then the rubbish heat utilization ratio will exceed the garbage power technological process and reach more than 3 times when introducing the garbage incineration process flow process of the moist rubbish of revolution kiln drying of the moist rubbish of oven dry, therefore should be the developing direction of garbage incineration process from now on.Just can fully the hearth area of incinerator be used for fully the burning of rubbish when in incinerator, only burning the house refuse after drying, thereby can significantly improve the interior temperature levels of incinerator and the firing rate of rubbish, can increase substantially the ability that incinerator is burnt away the refuse at double.Just can cancel the water-cooling wall low temperature structure that is arranged on the extensive heat absorption in the high-temperature burner hearth simultaneously after abolishing electrification technique as well as, this can not only further improve the temperature in the burner hearth, and more helping preventing dioxin directly along near the low temperature the water-cooling wall, low flue gas viscosity area of space is directly overflowed outside the stove.Higher in addition fire box temperature can allow to adopt the mixed combustion technology of combustiblerefuse and non-combustible waste fully, thereby independent garbage sorting operation needn't be set before waste incineration again.Because flame holding is very high when burning the rubbish after the oven dry, therefore more needn't adopt the very strong reciprocating fire grate of stirring property in the burner hearth, and only need adopt in the packaged boiler chain type fire grate that extensively adopts, this is very beneficial for increasing substantially the reliability and the service life of fire grate, and the flying dust concentration in the minimizing burner hearth, be very beneficial for thoroughly burning of rubbish.
2. background
2.1 generating
Modern incinerator must be considered the recycling problem of rubbish thermal resource in the burning process because garbage treatment quantity is big, and most of for this reason bulky refuse incinerators all are equipped with TRT, so as to regaining the partial heat energy that produces in the waste incineration process.But according to thermal technology principle, the existence form of various energy all has corresponding energy metric attribute.When thermal technology's conversion process of relating between different quality energy, in fact the energy percentage that can transform is main relevant with the metric attribute difference that transforms the front and back energy.House refuse water content height, the calorific value fluctuation is big, and incineration temperature is low, belongs to the energy rank of inferior quality, and electric energy then belongs to other energy of high energy level.Even the operation in a large amount of power plants practice already proof heat energy in the fuel in the equipment advanced person's who adopts more satisfactory fossil fuel extensive power plant ratio of being converted into electric energy also only be about 30～35% [2] P.24, the operation practice after countless incinerators build up is more same can prove waste incineration the time, and contained a large amount of heat energy only actuallies about about 20% can be converted into electric energy.This shows that the electricity generation system only actually in running that is accounting for significant proportion in the garbage burning factory investment can reclaim very a spot of heat energy in the rubbish, thereby makes the desired value of the utilization rate of rubbish thermal resource well below the investor.Generate electricity in addition required steam usually system directly absorb a large amount of radiant heat in the burner hearth from being directly installed on water-cooling wall in the incinerator high-temperature burner hearth, this production of steam mode of directly absorbing heat in the burner hearth can significantly reduce the temperature levels in the burner hearth, thereby delay the firing rate of rubbish, reduce the disposal ability of incinerator, and the dioxin that inevitably can make severe toxicity is along near the low temperature the water-cooling wall, outside the calm effusion stove in low viscosity zone.
2.2 oven dry
The house refuse water content is very high, usually moisture can reach about 50%～65% of moist rubbish weight, even so, but moist rubbish still can directly drop into the coarse burning operation of carrying out the burning while drying in the incinerator, must be pointed out that this is still up to now always in the widely used incineration treatment of garbage pattern that falls behind very much.This comes down to two kinds of reaction properties rubbish baking operation and waste incineration operation different fully and that contradict each other are incorporated in the operation process of poor quality that carries out in the same burner hearth.The rubbish oven dry is heat absorption technology, and moist rubbish bulk deposition to be dried will certainly significantly reduce the temperature levels in the burner hearth in high-temperature burner hearth, makes coefficient of excess air rising in the burner hearth, and influences waste incineration speed.Rubbish stoving process in addition, requirement is to being deposited in the action of stirring that moist rubbish in the burner hearth do not stop, but the frequent stirring action of fire grate can have influence on the stability of the rubbish flame that has caught fire, the smooth combustion of rubbish is unfavorable for catching fire, and can make the rubbish in the burning be difficult to complete after-flame, and the interior flying dust of burner hearth is increased considerably.This shows rubbish oven dry and these two kinds of technologies that contradict each other of waste incineration are incorporated in the same burner hearth and carry out.Not only can reduce fire box temperature significantly, delay the firing rate of rubbish, the stability of flame is burned in influence, and undue fierce stirring action also can influence the thorough after-flame of rubbish.
2.3 letter sorting
House refuse complicated component, and mixing in a large number not combustible material and moisture is the calorific value before improving it as far as possible and burning, and normal the employing: a. is provided with the garbage sorting operation before burning; B. constantly stir in the storage rubbish to impel the component of refuse homogenising and to quicken the evaporation of moisture with crane.But in fact waste incineration process should include the non-combustible waste that mixes can be carried out disinfection under the condition of high temperature when burning, sterilization, subtract the function of appearance, and will be some before burning already for around artificial the sorting out of noncombustibles material (can that for example contains residual food) of rubbish institute severe contamination obviously be a kind of irrational technical process that deviates from fully with above-mentioned functions (ideal process should be treat in the can residual food burn finish after the iron sheet of recovery can from the rubbish residue again).If go into seriously the reason that adopts this extremely irrational burning presort operation, then be not difficult to find its main cause really when burning moist rubbish the furnace temperature in the burner hearth low excessively, and fire grate does not stop to stir down the very unsettled state that catches fire of flame, the set strong water-cooling wall of a large amount of heat absorptions has increased the difficulty of moist waste incineration and the difficulty of after-flame especially in the burner hearth in addition, thereby can only belong to a kind of unavoidable remedial measure with the letter sorting operation before the increase waste incineration slightly to improve the combustibility of some moist rubbish.
3. summary of the invention
The present invention system is big according to contained amount of heat in the house refuse, but the extremely low feature of the quality of heat energy proposes to abandon the critical defect that heat can not reclaim in a large number in the rubbish when garbage power is this to be converted into high-energy rank mode with low energy levels, and replace direct with rubbish smoke pre-heating combustion air, the new technology that the rubbish heat ad eundem of moist rubbish transformed before oven dry mud slurry and oven dry were burned, the technical process flow process of this rubbish ad eundem heat energy trans-utilization mode is seen Fig. 1, in the flow process rubbish heat system by the transform mode of inter-stages such as same quality transform (do not exist in the rubbish heat conversion process at first produce high steam and continue after make steam do expansion work to be converted into mechanical transformation of energy course of action, just the heat content of rubbish is converted into the heat content of combustion air or is converted into the heat content of mud slurry or moist rubbish by the mode of direct contact), thisly can increase substantially contained low-quality energy utilization ratio in the rubbish with the transformation mode between the quality energy.And adopt independent rubbish drying plant will have following all advantages: 1) needn't provide 30～60% hearth area to be used to pile up moist rubbish in the burner hearth of incinerator again it is dried in burner hearth; 2) in the burner hearth water-cooling wall of a large amount of heat absorptions needn't be set again, thereby help the raising of temperature in the burner hearth; 3) cancellation of shifting out low temperature water-cooling wall in burner hearth and the burner hearth of moist rubbish must significantly improve fire box temperature, and increasing substantially of temperature can significantly improve firing rate and the waste incineration quality of garbage drying in incinerator.Calculating shows that the capacity of incinerator of incinerator under identical hearth area can improve 2～3 times the level that reaches approximately; 4) because of no longer considering the moist rubbish of oven dry in the burner hearth, therefore needn't select the strong excessively reciprocating fire grate of stirring capacity again for use, thereby can reduce the probability that fire grate damages, and help stablizing the fired state of rubbish and reduce the interior flying dust of burner hearth; 5) letter sorting operation before the waste incineration needn't be set again, and can make full use of the various noncombustibles material that the high temperature that produces when burning will be mingled in the rubbish and carry out disinfection, sterilization subtracts appearance; 6) fully needn't be again by to rubbish in the storage constantly stir calorific value fluctuation with balanced rubbish, thereby significantly reduce the load of garbage crane; 7) owing to no longer exist generating to need, needn't have to suppress the waste incineration ability of incinerator when therefore incinerator moves again because must at first stablizing the requirement of supply quantity of steam, thereby can make full use of the capacity of incinerator of incinerator, increase substantially the timely disposal ability of rubbish; Simultaneously more needn't carry out continual stirring to the moist rubbish that is deposited in the rubbish storage, this just can significantly reduce the bad smell that produces when rubbish stirs in the whole factory building.8) thus because the low-temperature space in the high-temperature burner hearth can be thoroughly eliminated in cancellation water-cooling wall setting, make in the burning process the formed dioxin no longer can be, thereby dioxin is thoroughly decomposed in the burner hearth of high temperature fully along near the phenomenon of the low-temperature space effusion burner hearth the water-cooling wall;
3.1 house refuse is the necessity of oven dry separately:
The rubbish baking operation is a kind of endothermic reaction, must absorb a large amount of heats from the external world in the vaporization evaporation process of contained humidity in the rubbish.House refuse belongs to the loose media material in addition, internal thermal resistance is very big, for shortening parches the time, the stirring rubbish that must not stop in drying course in time is exposed under the radiation of burner hearth thermal exposure to increase substantially the speed that it absorbs heat the moist garbage energy that is deposited in inside.For shortening the usually total hope of drying time air as much as possible can be passed through in the sanitary fill object, this obviously can increase considerably the coefficient of excess air of flue gas, thereby furnace gas temperature is reduced.
The waste incineration process then belongs to exothermic reaction, and its firing rate has determined the furnace temperature level basically.Rubbish institutional framework after the oven dry is loose, can allow enough combustion airs to pass through between its space, therefore its burning process of rubbish after the oven dry approaches other solid fuels, fire grate is stirred requirement and little, and too Ji Lie stirring not only can make the rubbish that has been in the state of catching fire be easy to extinguish again, and the interior flying dust of burner hearth is increased considerably.
The above is enough to show that the moist rubbish of direct burning belongs to a kind of two classes technology different fully and that contradict each other that makes in fact and combines the coarse operation of carrying out, baking operation also differs widely to the requirement that fire grate stirs degree with the burning operation, their essence of chemical reaction contradict each other especially, be incorporated in the quantity that can increase considerably combustion air in the burner hearth after carrying out together in the same burner hearth, this not only can reduce fire box temperature significantly, and reduces the garbage disposal ability of incinerator significantly.More make simultaneously to fire grate require complicated, the different stirring needs that are difficult to satisfy simultaneously oven dry and burning.Therefore waste incineration performance after the oven dry can directly use the chain type fire grate near timber.
3.2 making full use of of rubbish waste heat:
The bulky refuse incineration plant of many introductions often adopts rubbish power generating device supporting to reclaim the heat in the rubbish, but according to thermal technology principle, only can only transform small amount of thermal energy when being converted into electric energy with the extremely low rubbish heat energy of quality, all the other a large amount of residue heat energy then will directly enter in conversion process and go in the surrounding medium and can't reclaim, therefore in fact be a kind of bad selection of returns of investment extreme difference, in power generation process, can only reach the effect of huge heat energy in a small amount of recovery rubbish.
1) for improving waste incineration speed, the industrial furnace designer always will consider the mode of air heat exchanger with preheated air is set in high-temperature flue, and therefore air preheater being set in high-temperature flue be the first step of utilizing the waste incineration waste heat.2) usually in the daily life in arbitrary city except can producing the huge house refuse of quantity every day, always also can produce a large amount of pending sewage simultaneously, and the decontamination process of the various sewage concentrated forming process of mud slurry in fact just.And fact proved that the rehabilitation difficulty of liquid sludge slurry will be far longer than solid-state house refuse, even still do not find the mud slurry treatment process of energy economical rationality at present in developed country yet.Think among the present invention and carry out drying in the high-temperature flue gas that produces after the waste incineration if adopt the spray-drying principle directly pending high concentration sludge slurry to be sprayed into spray-dired technology mode, the process that then must utilize mud slurry particulate directly to contact with high-temperature flue gas is carried out heat exchange efficiently, make the dry and formation powdery solid granules of mud slurry dewatering and dry, hold solidified processing intent thereby reach subtracting significantly of mud slurry, Fig. 2 is mud slurry drying tower profile.3) it is considered herein that be necessary to be provided with separately the moist rubbish drying unit of rotary kiln type machine that for thoroughly drying moist rubbish Fig. 3 is the rotary kiln view of oven dry rubbish.Utilize the middle low-temperature flue gas after sludge-drying is starched directly fully to contact oven dry with moist rubbish fierce moist rubbish that stirs in the rotary kiln type dryer with direct contact and convection type, moist rubbish in service will drive for the poppet body on the rotary kiln barrel, rise and constantly upset along wall, fall, upgrade, it stirs intensity considerably beyond moving grate, surface after moist rubbish is brought in constant renewal in then can directly contact with flue gas, so intensification and rate of drying should be very high, its drying efficiency is higher than oven dry in the stove far away.Fig. 4 is the incinerator section.
3.3 inventive features
For making full use of the heat resources in the waste incineration process, the present invention has following feature: make high-temperature flue gas behind the consumer waste incineration earlier by the heat exchanger warm-up combustion-supporting air, and then flue gas is introduced mud starch the mud slurry drops direct contact heat transfer that makes in the drying tower with from the nozzle ejection, make drop intensification evaporation and be converted into solid state powder, mill exhauster structure by the drying tower bottom is discharged, leaving the lower flue gas of temperature behind the mud slurry drying tower is introduced in the rotary kiln that the moist rubbish of oven dry uses again, the moist rubbish that drives for the supporting plate on the rotary kiln outer wall is along falling after wall rises again and being shed in flue gas stream, except that directly from the high-temperature wall surface draw heat of contact, the outer surface its state that is scattered under more can be directly flows fully to contact with flue gas and is heated and heats up moist rubbish in drying course.Flue gas can be passed to combustion air with most of heat in above-mentioned three kinds of conversion processes, mud slurry and moist rubbish, flue gas are introduced at last again and purify the back discharge in the hydrofilter.
3.4 for example
Power plant is an example with the band garbage disposal of Lip river, Chengdu: have 3 400 tons of/day incinerators in the factory, handle 1,200 ton of rubbish every day, thermal value range 〉=4 that house refuse requires, 815kJ/kg[3] P.79, join 2 each 12MW generators.Calculate its heat utilization ratio:
Rubbish caloric value during the whole day oepration at full load:
Q1＝3*400×1,000×4,815＝5.8*10
9kJ/d
2 following at full capacity electric energy that produce of generator whole days are
Q2＝2*12*10
3kJ/s＝2*12*10
3*24*3600/d＝2*10
9kJ/d
But in the incinerator actual moving process because the fluctuation of refuse thermal value, the water-cooling wall dust stratification, the influence of factors such as the air excess quantitative change is moving, generator is actually and can not move in the best condition, generated output when getting actual motion is 70%, so the electric energy of 2 actual generations of generator should be in the waste incineration process
Q3＝Q2*70％＝2*10
9*70％＝1.4*10
9kJ/d
The electric energy that consumes of self still needing in the known spam burning process again is 23% ([3] P.29), and the quantity that its heat content is converted into electric energy output in the ∴ waste incineration process should be:
1.4*10
9×(1-23％)＝1.08*10
9kJ/d
This shows that the electric energy ratio that its heat resources can be converted into to electrical network output in the waste incineration process only is: 1.08*10
9÷ 5.8*10
9* 100%=18.6% also is that its reality can be no more than 1/5th of rubbish heat resources to the electric energy of electrical network supply.This example clearly illustrates is using low-quality energy to be converted in the process of high-quality energy that actual recuperable heat resources ratio is very low in the rubbish, this theoretical energy transformation mode of blindly promoting waste incineration and generating electricity of thermal basis of running counter to comes down to a kind of with the atmospheric towards periphery transformation mode of the direct row of most of heat in the rubbish, can not make full use of the heat resources of rubbish, only can aggravate atmospheric thermal pollution.Therefore this house refuse power generation mode can only be a kind ofly must rely on government to subsidize to keep the operational mode of waste incineration and generating for a long time, and it is big more to have an investment, subsidizes also many more economic characteristics, obviously should belong to a kind of selection scheme of returns of investment extreme difference.
The thermal efficiency data that obtained are calculated according to the thermal technology of 250 tons of/day rubbish-mud slurry comprehensive regulation stove by following data system: when moist house refuse calorific value is 5, during 100kJ/kg, waste incineration heat every day all advances the stove rubbish except that warm-up combustion-supporting air and oven dry, still can dry 310 tons in mud slurry, the corresponding heat utilization ratio of rubbish is up to 77% at this moment, the transformation mode that this technical process principal character has been correct selection between the same quality energy, therefore have the rubbish heat that can make full use of in conversion process, the heat resources that can increase substantially rubbish transforms ratio.More than two examples illustrate that respectively it is a kind of thermal basis theory of running counter to that the heat in the energy house refuse poor quality is converted into electric energy, the thermal technology process that the rate of recovery is very low.If independent revolution kiln drying have the moist rubbish of bulk cargo body characteristics and with after-heat with drying process with atomizing oven dry mud slurry then can receive very significantly economic effect.
4 economic benefits:
The investment cost of garbage burning factory is usually about 450,000～600,000/ton when adopting electricity generation system, wherein the electricity generation system expense accounts for more than 50% of total investment expenses, as send galvanic process elsewhere for spray-drying mud slurry and dry investment that moist rubbish technology then is converted into rubbish per ton about about 200,000～250,000/ton, the investment cost that investment cost will exceed when adopting garbage disposal mud sizing process when adopting garbage power technology under garbage treatment quantity the same terms reaches more than 2 times.
Known every degree electricity online price when enjoying the national renewable sources of energy and subsidize policy favour be 0.5 yuan [3] P.37, domestic rubbish disposal expense per ton is 71 yuan, now gets the processing of mud slurry and charges and be taken as 110 yuan of considerations.Three 400 tons/day incinerator is equipped with in two 12MW generator operation processes, because refuse thermal value, the fluctuation of coefficient of excess air, factors such as water-cooling wall surface dirt, the actual generated energy of can output power considering only can be by 70% oepration at full load time every day should be:
2*12,000kw*70%*24h=403,000kwh=403,000 degree, therefore system is 23% from power consumption, and corresponding output electric energy should be every day when actual motion: 403, and 000*77%=310,000 degree, sale of electricity every day income income $1=310 then, 000*0.5=155,000 yuan/day;
As handling the calculating of 310 tons of mud slurries simultaneously every day when incinerating combustion value is 5100kJ/kg by handling 250 tons of/day incinerators above-mentioned every day, it is converted into treating capacity is 1, handle dirty mud amount the every day during 200 tons of/day rubbish and should be 310* (1,200 ÷ 250)=1,488 ton/day
It is corresponding handles mud slurry income income $2=1,440*110=158, and 000 yuan/day, can enjoy under the protection of the higher policy advantage of national renewable energy power generation calculation of price the two economic well-being of workers and staff to the full in garbage power technology close.But can make full use of the most of heat (reaching about 77%) that is discharged in the waste incineration process when must be pointed out the rubbish heat with drying process with atomizing oven dry mud slurry, and when adopting garbage power technology in the rubbish most of (up to about 3/4ths) heat can not obtain utilizing, only be to have utilized preferential sale of electricity price advantage, just can make its economic benefit passable from the teeth outwards.
The comparison of 5 two kinds of different process flow processs
The heat that produces during waste incineration when adopting garbage power technology need be converted into the heat content that is arranged in the boiler soft water in the high-temperature burner hearth water-cooling wall earlier, make the water boiling form steam, guide superheated steam to enter the acting of expanding in the steam turbine then, form with the expansion work driving steam turbine rotor motion of steam is converted into mechanical energy, this kinetic energy makes coaxial mounted coil cutting magnetic line to be converted into electric energy, the parameter request in the time of still must arranging with satisfied online through the lifting of overvoltage and frequency etc. before electric energy output again.All can have corresponding loss in above-mentioned each flow process, a large amount of heat energy that especially are hidden in after the steam expansion in the exhaust steam are to belong to irretrievable used heat.In addition in case adopt the strict restriction of restricted stability that the capacity of incinerator of incinerator after the garbage power technology will be serious and can't improve its garbage disposal ability arbitrarily on the required steam of generating.
When the waste incineration heat being introduced the moist rubbish of the independent revolution kiln drying that is provided with and introducing in the drying tower spray-drying mud slurry, heat in the flue gas all is directly heat to be passed to moist rubbish and the mud slurry drops that is contacted by the mode of direct contact heat transfer, no longer need to transform link in the middle of other, thereby heat conversion process very letter is tied the utilization rate that can increase substantially the rubbish heat, does not more exist in drying course and orders about the needs that steam is done expansion work.When advancing the fluctuation of stove refuse thermal value, can pass through the timely mud slurry straying quatity of adjusting in addition fully with the preceding flue-gas temperature of stable purification, therefore a large amount of work of complete unnecessary cost go to carry out the work that rubbish turns over the storehouse, and incinerator can go out the round-the-clock incineration treatment of garbage of carrying out of rate by maximum fully, thereby can greatly separate the production capacity of emitting incinerator, make incinerator can be in the good running status of fully loaded all the time.Based on oven dry back refuse thermal value increase substantially and the garbage drying combustion stability very good, therefore fully the garbage sorting operation needn't be set again, can directly burn the house refuse that has various not combustible materials, and the high temperature when burning makes and numerously can be sterilized for the not combustible material of house refuse severe contamination, sterilization subtracts the purpose of appearance.
Electrification technique as well as program complexity, equipment needed thereby is numerous, takes up an area of extensively, and investment is big.With Lip river, Chengdu band garbage incinerating power plant is example, and its design scale is 1200 tons/day of day burning disposal domestic wastes, and disposes the generator and the corresponding steam generator system equipment of 2 each 12MW power.Full factory overall floorage is 38,000 square metres.Building 80 mu of [3] investment costs of clean land used is 450,000 yuan/ton.With my 250 tons of/day designed life incinerators and the comprehensive regulation factory that handles 310 tons of/day mud slurries every day is example: only 1,638 square metre of overall floorage, 4,929 square metres of plant area's areas.Compare after now enlarging 4.8 times: amount to construction area and should be 4.5 * 1,638=7,862 square metres, only be 21% of above-mentioned Chengdu factory construction area, plant area's area of amounting to is 4.8 * 4,929=23,659 square metres=35.5 mu, only build 44% of clean land used for above-mentioned Chengdu, the investment cost of amounting to only is 25～300,000 yuan/ton, half of not enough above-mentioned power generation mode.
6 brief summaries
House refuse all contains a fairly large number of moisture usually, and calorific value is lower, and the fluctuation of calorific value is very big, and obviously system belongs to fuel poor quality.Even increase the garbage sorting operation and adopt the method for in storage, constantly stirring rubbish also only can improve some rubbish heat energy qualities a little, but still can not make house refuse break away from basic status poor quality far away.The rate of recovery of its energy must be very limited when according to the thermal technology principle desire rubbish heat poor quality being converted into the electric energy of high-level energy quality, therefore this to utilize the mode of rubbish heat obviously be to run counter to the basic goal that makes full use of the rubbish heat resources, also is bigger understanding mistaken ideas in the environmental protection field up to now.
The mud generation is about 0.3%～0.5% (in moisture content 97%) of sewage load in the municipal sewage treatment process, and quantity is very surprising.If Treatment of Sludge is improper, very easily cause secondary pollution.And all lack economical and practical mud slurry dewatering process so far both at home and abroad, current Treatment of Sludge expense accounts for 40%～60% of Sewage Plant operating cost, very high [4].The mud of taking a long view slurry disposes to walk the road that the drying and dehydrating of " innoxious, minimizing, solid state " solidifies.Propose adopting the huge heat that produces in the incineration process of domestic garbage mud slurry that forms in the purification process of in time disposing of sewage on a large scale among the present invention obviously is a kind of comprehensive regulation mode very efficiently that can make full use of the rubbish heat resources, and the waste incineration heat is directly used in the sludge-drying slurry has very significantly economic benefit and huge social benefit.
7 description of drawings
The flow chart that the heat that Fig. 1 produces during for waste incineration makes full use of.Leave high-temperature flue gas behind the burner hearth earlier by the heat exchanger warm-up combustion-supporting air, and then enter in the mud slurry drying tower, heat up dehydration from the direct back that contacts with high-temperature flue gas of the mud slurry drops of nozzle ejection, be dried to powdery granule, and from the output mechanism of drying tower bottom, discharge successively.Flue gas after the cooling is introduced the drying process that carries out moist rubbish in the rotary kiln again, the supporting plate that moist rubbish at first is installed on the rotary kiln outer wall rises to the revolving drum top, and fall under gravity, fall rubbish in flue gas stream by the mode of the direct contact drying of absorbing heat rapidly with dispersity.The flue gas that leaves the very low temperature behind the rotary kiln then enters and carries out in the hydrofilter discharging after the udst separation.Fig. 2 is mud slurry drying tower, and high-temperature flue gas and mud slurry are all introduced from the cat head face, co-flow, and the mud slurry particle after the oven dry is then discharged for the discharge with endless screw machine that is arranged at the bottom of the tower.Fig. 3 is the revolution drying kiln, and moist rubbish is driven by the inwall supporting plate and rises, and directly sheds then in flue gas stream and carries out drying.Fig. 4 is the incinerator profile, because the waste incineration after the oven dry is functional, therefore can adopt burning coal fully, the chain type fire grate that extensively adopts during solid fuels such as timber, this fire grate is divided into 3 sections, so also has the stirring action that falling of rubbish stirred in the burning process.A wind air quantity under each fire grate of the more convenient control of 3 section grates in addition.
8 notes
[1] Tong Jungeng, Lu Wancheng compiles publishing house of " thermal basis " Shanghai Communications University, and 2001,
[2] study of the Song Dynasty allows and shows " thermophysical new ideas " Chinese Water Conservancy water power publishing house, and 2009,
[3] " garbage incinerating power plant is installed and running technology " China Electric Power Publishing House is write by power construction two companies in Sichuan, and 2009,
[4] Chinese environmental protection internet " Shenzhen's sludge treatment present situation and countermeasure ".
Claims (1)
1. the present invention has following feature: make high-temperature flue gas behind the consumer waste incineration earlier by the heat exchanger warm-up combustion-supporting air, and then flue gas is introduced mud starch the mud slurry drops direct contact heat transfer that makes in the drying tower with from the nozzle ejection, make drop intensification evaporation and be converted into solid state powder, mill exhauster structure by the drying tower bottom is discharged, leaving the lower flue gas of temperature behind the mud slurry drying tower is introduced in the rotary kiln that the moist rubbish of oven dry uses again, the moist rubbish that drives for the supporting plate on the rotary kiln outer wall is along falling after wall rises again and being shed in flue gas stream, except that directly from the high-temperature wall surface draw heat of contact, the outer surface its state that is scattered under more can be directly flows fully to contact with flue gas and is heated and heats up moist rubbish in drying course.Flue gas can be passed to combustion air with most of heat in above-mentioned three kinds of conversion processes, mud slurry and moist rubbish, flue gas are introduced at last again and purify the back discharge in the hydrofilter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607040A (en) * | 2012-03-23 | 2012-07-25 | 上海康恒环境工程有限公司 | Method for incinerating domestic garbage and municipal sludge together |
| CN106949475A (en) * | 2017-04-01 | 2017-07-14 | 广东焕杰环保科技有限公司 | A kind of sludge incinerating system and its incinerating method |
| CN110822444A (en) * | 2019-11-01 | 2020-02-21 | 通玉实业发展(上海)有限公司 | Application of white mud in waste incineration treatment and waste incineration treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102607040A (en) * | 2012-03-23 | 2012-07-25 | 上海康恒环境工程有限公司 | Method for incinerating domestic garbage and municipal sludge together |
| CN102607040B (en) * | 2012-03-23 | 2015-03-11 | 上海康恒环境股份有限公司 | Method for incinerating domestic garbage and municipal sludge together |
| CN106949475A (en) * | 2017-04-01 | 2017-07-14 | 广东焕杰环保科技有限公司 | A kind of sludge incinerating system and its incinerating method |
| CN106949475B (en) * | 2017-04-01 | 2019-03-01 | 广东焕杰环保科技有限公司 | A kind of sludge incinerating system and its incinerating method |
| CN110822444A (en) * | 2019-11-01 | 2020-02-21 | 通玉实业发展(上海)有限公司 | Application of white mud in waste incineration treatment and waste incineration treatment method |
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