CN100523684C - Enclosed multi-chamber fluidized bed drying method for sludge - Google Patents
Enclosed multi-chamber fluidized bed drying method for sludge Download PDFInfo
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- CN100523684C CN100523684C CNB2007101917268A CN200710191726A CN100523684C CN 100523684 C CN100523684 C CN 100523684C CN B2007101917268 A CNB2007101917268 A CN B2007101917268A CN 200710191726 A CN200710191726 A CN 200710191726A CN 100523684 C CN100523684 C CN 100523684C
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Abstract
A closed multi-room fluidized bed sludge drying method is provided, which is a sludge drying method having the advantages of simple equipment structure, convenient operation, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc. After the mechanically dewatered sludge is mixed with the back-mixed sludge, the mixture is dried room by room in an inert particles multi-room fluidized bed dryer (3). The first room and the second room of the inert particles multi-room fluidized bed dryer (3) adopt inert particles (f) as heat storage medium. Gas from a cyclone separator (5) goes through a spray tower (7) and returns into an air heating unit (4) through a circulating fan (10). Part of dried sludge (e) at the lower part of the cyclone separator (5) enters the inert particles multi-room fluidized bed dryer (3) through the back-mixing in a mixer (2). Waste liquid from the bottom of the spray tower (7) enters a waste liquid circulating pool (8), with part of waste liquid circulating into the spray tower (7) and part into a sewage treatment system.
Description
Technical field
The present invention is a kind of to the wet withering method of mud, especially a kind of enclosed multi-chamber fluidized bed drying method for sludge.
Background technology
Mud is a kind of porous dielectric substance of high-moisture, the water content height, and volume is big, and undressed moisture percentage in sewage sludge is up to 95%.And the landfill of mud, compost and turning sludge into fuel utilization all require the moisture content of mud is reduced to below 65%.The mechanical dehydration method can only reduce to 70%～80% with moisture content at present, mud capillary water and adsorbed water be deviate from, and must adopt the heated drying method.
Fluidization technology is since the nineteen twenty-one invention, characteristics such as its heat capacity coefficient is big, the thermal efficiency is high, good seal performance and the time of staying can be regulated arbitrarily provide advantageous conditions the most for the high dry of material, thereby become the most effective means of industrial quarters xeraphium granular material.The same spray-drying of fluidized drying, oven drying are compared, and outstanding advantage is that energy consumption is low, single device production capacity is big, and time saving and energy saving, dust pollution is little.The fluidized drying device type of using has at present: single chamber fluidized bed dryer, multi-stage fluidized bed dryer, multi-cell fluidized bed drier etc.
In the single chamber fluidized bed drying device, residence time of material is inhomogeneous, and the material that undried might take place is directly discharged bed, that is there is the moisture content skewness in fluid bed outlet particle.In order to improve this situation, developed multi-stage fluidized bed dryer.The multilayer operation can improve the thermal efficiency, the time of staying of material in bed distributes and narrows down greatly, but its operation is difficulty relatively, upper materials enters lower floor by overflow pipe in the bed, very easily produces the perforation of clogged up with material or gas, causes the blanking instability, the last bed of material is not easy to set up, crushing is excessive, power consumption height, complex structure.In multi-cell fluidized bed drier type, oscillatory type multi-cell fluidized bed drier the most commonly, its mechanical moving element is many, and noise is big, maintenance of equipment is complicated, and the thermal efficiency ratio multi-stage fluidized bed dryer is low.
During the multi-cell fluidized bed sludge-drying, mud lumps easily in Room the 1st, 2 of multi-cell fluidized bed drier, causes the drier can't operate as normal.Main cause has: 1. there is " gluing phase " stage (moisture content is about 60%) in the drying sludge process, this stage have Sludge Surface hard, be difficult to pulverize and the inside is still the characteristics of sposh.The time of staying in this stage is long more, the easy more caking of mud.2. along with the rising of mud granule temperature, mud bonding phenomenon is strengthened, and when the mud temperature reached 400 ℃, caking property was very strong.
The drying sludge technology adopts the open type dry technology more at present, be drier come out contain humid gas behind exhaust gas processing device, directly enter atmosphere, but because the exhaust gas processing device ability is limit, the dust and unpleasant, the pungent gas that contain some in the discharge tail gas, will endanger when its content reaches finite concentration into healthy.
Summary of the invention
Technical problem: the present invention is directed to problems such as the caking, the thermal efficiency that occur at present are low, pollutant emission in the drying sludge process, propose a kind of enclosed multi-chamber fluidized bed drying method for sludge, this method has characteristics such as device structure is simple, easy to operate, mud adaptability is strong, the thermal efficiency is high, safe, continuous, stable.
Technical scheme: concrete technical scheme of the present invention is as follows:
1) enters blender behind the wet mud process mechanical dehydration device, the dewatered sludge that cyclone separator is discharged is discharged a part of dewatered sludge through belt conveyor, and another part enters blender, after mixing in blender, the Room the 1st that adds inert particle multi-cell fluidized bed drier by screw feeder
2) Room the 1st of inert particle multi-cell fluidized bed drier and Room the 2nd adopt inert particle as heat storage medium, after cold air is heated to 300 ℃～600 ℃ through air heating apparatus, enter inert particle multi-cell fluidized bed drier by the staged air distribution plate, mud is carried out drying
3) in inert particle multi-cell fluidized bed drier, mud is suspend fluidized state under hot air acting, and the dewatered sludge that evaporates behind the moisture is discharged inert particle multi-cell fluidized bed drier through overflow plate, finishes the drying sludge process,
4) reenter heater by circulating fan behind the gas process spray column that cyclone separator comes out, (waste liquid that comes out of bottom enters the waste liquid circulatory pool to spray column, the a part of waste water that is flowed out by the waste liquid circulatory pool enters spray column by the water circulating pump circulation, and another part waste water enters sewage disposal system.
Temperature is 250 ℃～300 ℃ in the inert particle multi-cell fluidized bed drier that adopts, and air distribution plate is the staged air distribution plate.
The spray column operating temperature that adopts is 25 ℃-85 ℃.
Described inert particle is materials such as river sand, quartz sand, slag of the coal-fired end.
Described staged air distribution plate is to, the multistage air distribution plate that distributes highly from high to low according to sludge stream.
Beneficial effect: compare with existing drying sludge technology, advantage of the present invention has:
(1) compare with box drying room, floor space is little, production capacity is big, the thermal efficiency is high, and dried mud humidity is even.Compare with pneumatic conveying drying, can make finished product reach the expection moisture content by regulating the length of material time of staying in fluid bed, operation be easy to control, and particle is damaged few.Compare with multi-stage fluidized bed dryer, manufacturing process is simple, processing ease, and bed resistance is little, and height can significantly reduce, and drying residencing time can be regulated arbitrarily.Compare with vibration multi-cell fluidized bed drier, movement-less part, system's control and easy to maintenance, fault is few, and expenditure of construction and investment cost are low.Solved the problem of luming easily that present multi-cell fluidized bed drier occurs simultaneously in Room the 1st, 2 when sludge-drying.
(2) flexible operation, but continous-stable safe operation.According to the final disposal requirement of mud,, obtain the solid content of different dry mud by regulating flow velocity, air distribution plate potential difference, dividing plate height in hot air temperature, the bed.
(3) inert particle is adopted in Room the 1st of fluid bed the, 2, inert particle is in the vigorous exercise state, mix fully between inert particle and mud and almost to have eliminated air film static on the Sludge Surface, mud is contacted closely with hot gas, heat and mass transport speed between mud particle and the gas is very fast, and efficiency of thermal transfer and evaporation rate are higher, and inert particle has very big thermal inertia simultaneously, further shorten mud in " gluing phase " time of staying, avoid the mud caking.Because gas can be lowered the temperature rapidly, so compare with other drier, can adopt higher gas access temperature, further improves efficiency of utilization.
(4) according to the difference of each chamber sludge moisture content of fluid bed, the hot blast air output of each air compartment of flexible modulation, the heat that each air compartment of reasonable distribution needs, efficiency of utilization height.
(5) adopt the multi-cell fluidized bed structure, the time of staying of mud particle in bed distributes very narrow, add temperature unanimity in the stove, make the product dewatered sludge have good physical aspect (as outward appearance, granularity, color and taste, hygroscopicity etc.) and chemical form (moisture, organic matter, total nitrogen, micronutrient levels etc.).
(6) adopt the closed cycle drying system, eliminate be similar to hydrogen sulfide, the methyl sulfide etc. that produce and have the influence of the fugitive constituent gas of penetrating odor to environment in the drying sludge process, whole system does not have the flue dust discharging, and is safe and reliable.
(7) staged air distribution plate structure helps increasing mud horizontal proliferation speed in multi-cell fluidized bed.Adopt overflow plate control during the mud discharging, production capacity is big, is fit to large-scale production.
Description of drawings
Fig. 1 is an enclosed multi-chamber fluidized bed drying method for sludge schematic diagram of the present invention, wherein has: mechanical dehydration device 1, blender 2, inert particle multi-cell fluidized bed drier 3, screw feeder 3-1, staged air distribution plate 3-2, overflow plate 3-3, air heating apparatus 4, cyclone separator 5, belt conveyor 6, spray column 7, waste liquid circulatory pool 8, water circulating pump 9, circulating fan 10.Wherein also comprise wet mud a, waste water b, cold air c, hot-air d, dewatered sludge e, inert particle f.
The specific embodiment
(1) the easy problem of caking of the 1st, the 2 Room mud that the present invention is directed to present multi-cell fluidized bed drier, propose following solution: 1. each room temperature of fluidized bed dryer is 250 ℃～300 ℃ among the present invention, controls the mud adhesion strength with this.Control the time of staying of mud in bed simultaneously, reduce in the mud fugitive constituent to greatest extent and separate out; 2. among the present invention with 1st Room of the dried mud of part back-mixing again to fluid bed, the moisture content that makes mixed mud makes it directly cross " gluing phase " about 50%, alleviates the bonding of mud in drier; 3. inert particles fluidized bed is adopted in Room the 1st of fluidized bed dryer the, 2 among the present invention, the main distinction of it and traditional fluidized bed dryer is that its inner filling has a certain amount of inert particle or inert carrier, purpose is to utilize the thermal inertia of inert particle, further the heat and mass transfer performance between reinforcement sludge and gas.Compare traditional fluidized bed dryer, inert particle fluidized-bed dryer has plurality of advantages such as heat transfer coefficient is big, the thermal efficiency is high, operation is reliable, has good adaptability for paste class drying sludge.For oscillatory type multi-cell fluidized bed drier, movement-less part, system's control and maintenance are more simple.
(2) at the low problem of the thermal efficiency ratio multi-stage fluidized bed dryer of present multi-cell fluidized bed drier, the present invention is according to the difference of each chamber sludge moisture content, the hot blast air output of corresponding each air compartment of adjustment.That is to say that each air compartment is furnished with independent hot blast by-pass valve control, at the highest feed end of water content (i.e. Room the 1st) higher hot blast input quantity is arranged, and the hot blast input quantity of relative low spot is arranged, thereby the configuration that makes heat more effectively and reasonably at the hott bed end.
(3) the present invention is directed to dry run and produce secondary pollution problem, adopt the closed cycle drying system.Hot gas after the gas-heating apparatus heating behind the decreasing temperature and increasing humidity, obtains dewatered sludge by the cyclone separator separation in drier.After the gas that cyclone separator comes out is removed moisture through spray column, enter gas-heating apparatus again, realize that like this dry gas recycles, avoid the fugitive constituent contaminated environment in the mud, pollutant control parameter request to exhaust gas processing device (spray column) is not high simultaneously, need not to add deodorant.
(4) in order to prevent the reverse mixing of mud particle, the distribution grid of fluid bed is made notch cuttype, and adjust bed internal partition height, increase the bed potential difference, accelerate fluidization mud lateral flow speed.
1, behind the wet mud process mechanical dehydration device, the dewatered sludge of discharging with cyclone separator mixes in blender, is added Room the 1st of inert particle multi-cell fluidized bed drier by screw feeder.Room the 1st of inert particle multi-cell fluidized bed drier and Room the 2nd adopt inert particle as heat storage medium.Cold air enters inert particle multi-cell fluidized bed drier through behind the air heating apparatus by the staged air distribution plate.In inert particle multi-cell fluidized bed drier, mud is suspend fluidized state under hot air acting, evaporate moisture in boiling process, and the temperature in the drier is 250 ℃～300 ℃.Dewatered sludge is finally discharged inert particle multi-cell fluidized bed drier through overflow plate, thereby realizes that wet mud adds the continuous drying process that dewatered sludge is discharged from the other end from an end.The gas temperature of inert particle multi-cell fluidized bed dryer export is about 150 ℃.The gas that cyclone separator comes out reenters air heating apparatus through behind the spray column by circulating fan.The waste liquid that comes out in the spray column bottom enters the waste liquid circulatory pool, and a part of waste liquid circulation enters spray column, and a part of waste liquid enters sewage disposal system.The part dewatered sludge of cyclone separator bottom by blender once more back-mixing enter inert particle multi-cell fluidized bed drier.
2, heater is the air heater in electric heater or the equipment such as oil burner, coal furnace or incinerator, and the hot air temperature after the heating is 300 ℃～600 ℃.
3, the inert particle that uses in the inert particle multi-cell fluidized bed drier is inert substances such as river sand, quartz sand, slag of the coal-fired end.
4, the mechanical dehydration device is belt filter press, centrifugal dehydrator, gravity thickener etc.
Claims (5)
1. an enclosed multi-chamber fluidized bed drying method for sludge is characterized in that this method, is specially:
1) enters blender (2) behind wet mud (a) the process mechanical dehydration device (1), the dewatered sludge that cyclone separator (5) is discharged is discharged a part of dewatered sludge (e) through belt conveyor (6), another part enters blender (2), after in blender (2), mixing, the Room the 1st that adds inert particle multi-cell fluidized bed drier (3) by screw feeder (3-1)
2) Room the 1st of inert particle multi-cell fluidized bed drier (3) and Room the 2nd adopt inert particle (f) as heat storage medium, after cold air (c) is heated to 300 ℃～600 ℃ through air heating apparatus (4), enter inert particle multi-cell fluidized bed drier (3) by staged air distribution plate (3-2), mud is carried out drying
3) in inert particle multi-cell fluidized bed drier (3), mud is suspend fluidized state down in hot-air (d) effect, evaporates dewatered sludge behind the moisture through overflow plate (3-3) discharge inert particle multi-cell fluidized bed drier (3), finishes the drying sludge process,
4) reenter heater (4) by circulating fan (10) behind the gas process spray column (7) that cyclone separator (5) comes out, the waste liquid that comes out in spray column (7) bottom enters waste liquid circulatory pool (8), the a part of waste water that is flowed out by waste liquid circulatory pool (8) enters spray column (7) by water circulating pump (9) circulation, and another part waste water (b) enters sewage disposal system.
2. enclosed multi-chamber fluidized bed drying method for sludge according to claim 1 is characterized in that the interior temperature of inert particle multi-cell fluidized bed drier (3) that adopts is 250 ℃～300 ℃, and air distribution plate is staged air distribution plate (3-2).
3. enclosed multi-chamber fluidized bed drying method for sludge according to claim 1 is characterized in that spray column (7) operating temperature that adopts is 25 ℃-85 ℃.
4. enclosed multi-chamber fluidized bed drying method for sludge according to claim 1 is characterized in that described inert particle (f) is river sand, quartz sand, slag material of the coal-fired end.
5. enclosed multi-chamber fluidized bed drying method for sludge according to claim 1 is characterized in that described staged air distribution plate (3-2) is to, the multistage air distribution plate that distributes highly from high to low according to sludge stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2007101917268A CN100523684C (en) | 2007-12-14 | 2007-12-14 | Enclosed multi-chamber fluidized bed drying method for sludge |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007101917268A CN100523684C (en) | 2007-12-14 | 2007-12-14 | Enclosed multi-chamber fluidized bed drying method for sludge |
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| CN101186422A CN101186422A (en) | 2008-05-28 |
| CN100523684C true CN100523684C (en) | 2009-08-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101825389A (en) * | 2010-03-23 | 2010-09-08 | 杭州钱江干燥设备有限公司 | Boiling dryer outputting material by using inert gas |
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2007
- 2007-12-14 CN CNB2007101917268A patent/CN100523684C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825389A (en) * | 2010-03-23 | 2010-09-08 | 杭州钱江干燥设备有限公司 | Boiling dryer outputting material by using inert gas |
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