CN103435244B - Parallel sludge low-temperature drying method utilizing waste heat of flue gas - Google Patents
Parallel sludge low-temperature drying method utilizing waste heat of flue gas Download PDFInfo
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- CN103435244B CN103435244B CN201310348472.1A CN201310348472A CN103435244B CN 103435244 B CN103435244 B CN 103435244B CN 201310348472 A CN201310348472 A CN 201310348472A CN 103435244 B CN103435244 B CN 103435244B
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Abstract
The invention discloses a parallel sludge low-temperature drying method utilizing waste heat of flue gas. The parallel sludge low-temperature drying method comprises the following steps; 1, sending the flue gas discharged by a thermal power plant, a cement plant and a waste incineration plant into two parallel sludge drying granulating apparatus by induced draft fans to carry out sludge low-temperature drying and granulating process; 2, pouring sludge from a sewage treatment plant or dredging of rivers and lakes into a sludge hopper by a sludge conveying vehicle; 3, uniformly dividing and sending the sludge into two pieces of conveying equipment by a double-screw thruster at the bottom of the sludge hopper through separators arranged at sludge outlets; 4, respectively, continuously and quantitatively sending the sludge into the two parallel sludge drying granulating apparatus by the conveying equipment, enabling the sludge to be in direct contact with the heat flue gas, performing the heat exchange reaction, evaporating water in the sludge and naturally granulating; 5, sending the dried sludge particles into a finished product warehouse by the conveying equipment; 6, carrying out dry-wet multi-stage dust removal and desulfuration on tail gas discharged after the sludge is dried, so that the tail gas reaches the standard to be discharged.
Description
Technical field
The present invention relates to a kind of parallel sludge at low temperature drying method utilizing fume afterheat.
Background technology
City domestic sewage and trade effluent, through process qualified discharge, are preserve the ecological environment to build requisite environmental engineering measure.Be not less than 70% to China's treatment rate of domestic sewage in 2010, in by the end of June, 2012, national urban wastewater treatment amount has reached 1.39 billion cubic meters/sky.City domestic sewage and trade effluent, in the process be purified, can produce a large amount of mud, and the amount of sludge that China produces therefrom has reached 3,480 ten thousand tons/year, and every year with 10 ~ 15% rate of increase and increase.The mud that municipal sewage plant produces, the heterogeneous body complicated by organic relic, microorganism, inorganic particle, colloid etc. formed, after mechanical dehydration, the water ratio of mud, between 75% ~ 85%, because its water ratio is high and bulky, and contains multiple hazardous and noxious substances, therefore, be the great solid waste of a class hazardness, if do not processed thoroughly and controlled, serious secondary pollution will be caused to environment.How safety economy ground processes the environment difficulties that sludge from wastewater treatment plant is countries in the world facing.
Put into practice through many decades the method for sludge treatment set up abroad, mainly contain sanitary landfill, burning and Land_use change etc.These methods are implemented the condition depending on following necessity: mud sanitary landfill needs enough landfill space; Sludge incineration needs expensive facility investment and very high working cost; Land_use change has strict restricted condition to the content etc. of objectionable impurities in mud as heavy metal.The specific national conditions of China's sludge treatment: one is that the quantity of mud and volume are large especially, is applicable to the space of Sludge landfill at all; Two is the processing costss cannot bearing great number economically; Three is due to sanitary sewage and trade effluent merging treatment, thus makes the composition of mud very complicated, and particularly heavy metal content is very high, and Land_use change exists the potential risk of negative impact to ecotope.Obviously easily see, external sludge disposal technology is difficult in implementation of China, current China major part mud is only after preliminary treatment, just store up disorderly or simple landfill temporarily, not only take large-area land resources, and destroy ecotope and polluted underground water resource, serious detrimentally affect is brought to HUMAN HEALTH.Along with the fast development of China's economy and increasing rapidly of urban population, municipal effluent and Industrial Wastewater Treatment amount are constantly increasing, and this means that the quantity of sludge of sewage treatment plant will grow with each passing day.In the face of above reality, open up a sewage sludge harmlessness meeting China's actual conditions, minimizing, recycling treatment new way imperative.
The measurement result display of sludge components, containing a large amount of organic substances in mud, according to the correlation analysis between mud organic matter and calorific value, the mean calorie of China's mud is between 1500 ~ 2500Kcal/kg, which illustrating organic content higher in mud makes mud have available calorific value, and this calorific value makes mud have the value of resourcebility utilization just.But when the water ratio of mud is greater than 80%, mud does not have calorific value, and only have when water ratio is down to less than 30%, the calorific value of mud just has available value.This is because moisture evaporation needs the average heat absorbed to be 2675.9kJ/kg, but not over dry mud is before heat release, heat devaporation moisture must be absorbed, therefore, moisture will be evaporated the heat absorbed by the mud of water ratio 80%, substantially exceeds the calorific value that mud itself has.
Sewage work is through mechanical dehydration, and the water ratio of mud, generally about 80%, reduces containing of mud
The volume of water rate and reduction mud, first realizing minimizing is that mud finally obtains innoxious and key that is recycling treatment, and " heat drying " is deeply dehydrating sludge and reduces the most effective means of volume, it not only can kill the bacterium in mud, and the objectionable impurities in mud can be made to transform to stable state.In order to ensure that mud is when mummification, the effective decrement of moisture evaporation mud, organic matter is destroyed and preserve more than 95% original calorific value, and sludge drying must carry out under cryogenic.Therefore, " low temperature mummification " is the technological core that mud obtains final process.So-called " sludge at low temperature mummification " refers to that thermal source provides the heat lower than over dry mud burning-point (250 DEG C), the moisture in mud is evaporated and reaches reduced training and process that organic matter is not damaged.But sludge heat drying is the process that Net Energy consumes, and energy consumption cost accounts for more than 80 percent of sludge treatment total expenses usually, thus form " energy consumption bottleneck ".
The energy structure of China is based on fire coal, all parts of the country are a mass of big and small heat power plant, and cement is the basic raw material of national economy, and manufacture of cement needs to consume mass energy, a large amount of flue gases is all being discharged all the time in heat power plant and cement mill, and flue-gas temperature is generally between 120 ~ 200 DEG C.In addition, waste incineration is one of main method for the treatment of of urban garbage, waste incineration in-furnace temperature general control is at about 980 DEG C, in recent years, incineration treatment of garbage and high temperature (1650-1800 DEG C) thermolysis, melting process combines, rubbish is after burning disposal, eliminate various pathogenic agent, hazardous and noxious substances is converted into harmless object, and can heat energy be reclaimed, modern incinerator is furnished with good smoke and dust purifier, air conservation, the index of fume emission is identical with general coal-burning power plant, the flue-gas temperature of discharging during waste incineration is higher, general at about 200 DEG C.As can be seen here, the flue gas of heat power plant and cement mill and garbage burning factory discharge contains huge potential, the optimal thermal source of sludge at low temperature mummification just.If utilize these fume afterheats to carry out sludge drying, the running cost of sludge treatment must be made greatly to reduce, thus thoroughly overcome " the energy consumption bottleneck " of sludge heat drying.Mud granule after mummification is as auxiliary fuel, with coal burning electricity generation together with rubbish, as the raw material of manufacture of cement, also light energy saving brick and haydite can be fired, and production cement pressing products, really realize the treatment of wastes with processes of wastes against one another, the sewage sludge harmlessness of recycling waste, minimizing, recycling treatment.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of and utilize the parallel of fume afterheat
Sludge at low temperature drying method.
Utilize the step of the parallel sludge at low temperature drying method of fume afterheat as follows:
1) by the flue gas that heat power plant, cement mill and garbage burning factory discharge, by induced draft fan, the sludge drying granulating apparatus that feeding two is in parallel respectively, carry out sludge at low temperature mummification and granulation process, flue-gas temperature is 120 ~ 200 DEG C, and flue gas air quantity is 8 × 10
4~ 20 × 10
4m
3, the direction that flue gas sends into sludge drying granulating apparatus has two kinds, and a kind of is consistent with the direction that dewatered sludge advances, and another kind is contrary with the direction that dewatered sludge advances;
2) will from sewage work or river and lake dredging mud, sludge quality percentage water ratio is 75 ~ 85%, and by mud waggon, to pour wedge shape or the first half into be column Lower Half is the mud hopper of wedge shape, and the volume of mud hopper is 15 ~ 60m
3, after filling mud, the cover plate on hopper top is closed automatically;
3) Double-helix propeller of mud feed hopper bottom, by mud by being arranged on the division board of mud mouth, is all distributed into two handling equipments;
4) mud is sent into two sludge drying granulating apparatus in parallel by handling equipment respectively continuously and quantitatively, directly contact with heat smoke, carry out heat exchange reaction, sludge water content is evaporated, and self-assembling formation particle diameter is the mud granule of 1 ~ 10mm, long 22 ~ the 30m of sludge drying granulating apparatus, diameter 1.8 ~ 2.5m, rotating speed is 3 ~ 6 turns/min, obliquity is 1.5 ~ 2 °, heat exchanger time between mud and flue gas is 55 ~ 65min, dewatered sludge 30 ~ 100t/d, and percent mass water ratio is down to less than 40 ~ 45% from 75 ~ 85%;
5) mud granule after mummification is sent into stockyard by handling equipment, dewater further in process of cooling, until percent mass water ratio is down to less than 30%, burn together with coal as auxiliary fuel, or comprehensive utilization, the gas with foreign flavor of release is eliminated by bacteria bed;
6) after sludge drying, the tail gas given off from two sludge drying granulating apparatus in parallel, sends into multicyclone by induced draft fan, removes the dust of more than 90%, and then enter multilevel water curtains dedusting and desulfurizer, qualified discharge after dedusting degasification.
The beneficial effect that the present invention compared with prior art has:
1) heat power plant is utilized, the fume afterheat (120 ~ 200 DEG C) of cement mill or garbage burning factory discharge, for sewage plant sludge and Dredged Sludge mummification provide desirable low temperature mummification thermal source, when not consuming new forms of energy, mud is made to obtain effective mummification and decrement, for innoxious and recycling treatment establish key basis, not only thoroughly overcome " energy bottleneck " of sludge drying, and improve the energy utilization efficiency of generating and manufacture of cement, really open a treatment of wastes with processes of wastes against one another, the sewage sludge harmlessness of energy-saving and emission-reduction and environmental protection, the new way of minimizing and recycling treatment,
2) the low temperature dewatered sludge of fume afterheat is utilized, heat smoke directly contacts with wet mud, the mummification efficiency of mud is made to reach maximization on the one hand, mud is in mummification granulation process on the other hand, while reduction thermal pollution, most of flue dust in absorption flue gas and the sulfurous gas of 20 ~ 25%, make the efficiency of dedusting degasification greatly improve because reducing atmosphere pollution burden;
3) fume afterheat is utilized to carry out sludge at low temperature mummification, make moisture evaporation in mud and organism is not destroyed, not only save the original calorific value of mud of more than 95%, and the release of obnoxious flavour from Sources controlling, under a small amount of gas with foreign flavor is released in the background of a large amount of flue gas, by diluting effect and chemical reaction, ensure tail gas qualified discharge;
4) flue gas of dewatered sludge is utilized, intercept from the flue of heat power plant, cement mill or garbage burning factory end, the exhaust gas volumn size intercepted, controlled by air door, when sludge drying granulating system needs the operation such as maintenance, close air door, flue gas is discharged smoothly by former fume exhaust system, therefore, the normal operation of heat power plant, cement mill and garbage burning factory is not affected.
Accompanying drawing explanation
Accompanying drawing is the schema utilizing the parallel sludge at low temperature drying method of fume afterheat total.
Embodiment
As shown in drawings, utilize the step of the parallel sludge at low temperature drying method of fume afterheat as follows:
1) by the flue gas that heat power plant, cement mill and garbage burning factory discharge, by induced draft fan, the sludge drying granulating apparatus that feeding two is in parallel respectively, carry out sludge at low temperature mummification and granulation process, flue-gas temperature is 120 ~ 200 DEG C, and flue gas air quantity is 8 × 10
4~ 20 × 10
4m
3, the direction that flue gas sends into sludge drying granulating apparatus has two kinds, and a kind of is consistent with the direction that dewatered sludge advances, and another kind is contrary with the direction that dewatered sludge advances;
2) will from sewage work or river and lake dredging mud, sludge quality percentage water ratio is 75 ~ 85%, and by mud waggon, to pour wedge shape or the first half into be column Lower Half is the mud hopper of wedge shape, and the volume of mud hopper is 15 ~ 60m
3, after filling mud, the cover plate on hopper top is closed automatically;
3) Double-helix propeller of mud feed hopper bottom, by mud by being arranged on the division board of mud mouth, is all distributed into two handling equipments;
4) mud is sent into two sludge drying granulating apparatus in parallel by handling equipment respectively continuously and quantitatively, directly contact with heat smoke, carry out heat exchange reaction, sludge water content is evaporated, and self-assembling formation particle diameter is the mud granule of 1 ~ 10mm, long 22 ~ the 30m of sludge drying granulating apparatus, diameter 1.8 ~ 2.5m, rotating speed is 3 ~ 6 turns/min, obliquity is 1.5 ~ 2 °, heat exchanger time between mud and flue gas is 55 ~ 65min, dewatered sludge 30 ~ 100t/d, and percent mass water ratio is down to less than 40 ~ 45% from 75 ~ 85%;
5) mud granule after mummification is sent into stockyard by handling equipment, dewater further in process of cooling, until percent mass water ratio is down to less than 30%, burn together with coal as auxiliary fuel, or comprehensive utilization, the gas with foreign flavor of release is eliminated by bacteria bed;
6) after sludge drying, the tail gas given off from two sludge drying granulating apparatus in parallel, sends into multicyclone by induced draft fan, removes the dust of more than 90%, and then enter multilevel water curtains dedusting and desulfurizer, qualified discharge after dedusting degasification.
Application example 1.
Jiangyin, Zhejiang heat power plant utilizes the sludge drying engineering of fume afterheat.This project utilizes heat smoke (flue-gas temperature 130 ~ 180 DEG C, the exhaust gas volumn 15 × 10 of 75t discharged from coal-fired boiler
4m
3/ h), mummification every day about 80 tons of printing and dyeing sludges, water ratio is down to less than 40% from about 80%.The printing and dyeing sludge from sewage work's water ratio being about 80% is sent into sludge storage warehousing by mud transport trolley, by suspension bucket, mud is loaded the hopper quantitatively entering mud device, mud is advanced into mud mouth by the duplex of wedge shape feed hopper bottom, at the division board that mud mouth is provided with, mud is divided into two portions, respectively by two worm conveyors, continuously quantitative mud is sent into two sludge drying granulating apparatus in parallel, meanwhile, induced draft fan before electric precipitator by the heat smoke by air door, send into two sludge drying granulating apparatus in parallel, the long 25m of sludge drying granulating apparatus, diameter 2.4m, obliquity is 1.5 °, heat smoke directly contacts with wet mud, under sludge drying granulating apparatus rotates with the speed of 4 turns/min, carry out the heat exchange reaction of 60min, most of flue dust in flue gas and the sulfurous gas of 20 ~ 25% are by the sludge absorption that wets, and be fixed in mud granule, until complete sludge drying granulation process, after mummification, the water ratio of mud is down to about 45% from about 80%, volume is down to 1/3rd of primary sludge volume, and self-assembling formation particle diameter is the mud granule of 1 ~ 10mm.The tail gas discharged after sludge drying, first enters multicyclone, and then enters electric precipitation and desulfurizer, through dedusting degasification, and qualified discharge.Mud granule after mummification passes through handling equipment, send into stockyard, in the process of naturally cooling, dewater further, finally make water ratio be down to less than 30%, free from extraneous odour air release, the mean calorie of printing and dyeing sludge is 2105kcal/kg, and after mummification, mud granule directly sends into heat power plant, burns together with coal as auxiliary fuel, contribution heat energy, makes printing and dyeing sludge obtain innoxious and recycling treatment up hill and dale.
Application example 2.
Deqing, Zhejiang utilizes the sludge drying engineering of garbage incinerating power plant fume afterheat.Flue gas (flue-gas temperature 150 ~ 170 DEG C, exhaust gas volumn 10 × 10 that this project utilizes 35T incinerator to discharge
4m
3/ h), every day dewatered sludge 50 tons, water ratio is down to less than 40% from about 80%.Mud transport trolley will be the mud of about 80% from sewage work's water ratio, directly pour that quantitatively to enter the mud device first half be right cylinder Lower Half into and be the hopper of wedge shape, mud is advanced into mud mouth by the duplex of feed hopper bottom, at the division board that mud mouth is provided with, mud is divided into two portions, respectively by two worm conveyors, continuously quantitative mud is sent into two sludge drying granulating apparatus in parallel, meanwhile, induced draft fan after sack cleaner by the heat smoke by air door, send into two sludge drying granulating apparatus in parallel, the long 26m of sludge drying granulating apparatus, diameter 2.5m, obliquity is 1.5 °, heat smoke directly contacts with wet mud, under sludge drying granulating apparatus rotates with the speed of 3.5 turns/min, carry out the heat exchange reaction of 65min, until complete sludge drying granulation process, after mummification, the water ratio of mud is down to about 45% from about 80%, volume is down to 1/3rd of primary sludge volume, and self-assembling formation particle diameter is the mud granule of 1 ~ 10mm.The tail gas discharged after sludge drying, first enters multicyclone, and then enters two-stage water curtain dedusting degasifying device, qualified discharge.Mud granule after mummification passes through handling equipment, send into stockyard, in the process of naturally cooling, further dehydration, finally make water ratio be down to less than 30%, the gas with foreign flavor of release is eliminated by bacteria bed, and the mean calorie of mud is 2087kcal/kg, mud granule burning electricity generation together with rubbish after mummification, makes mud obtain innoxious and recycling treatment up hill and dale.
Claims (1)
1. utilize a parallel sludge at low temperature drying method for fume afterheat, it is characterized in that its step is as follows:
1) by the flue gas that heat power plant, cement mill and garbage burning factory discharge, by induced draft fan, the sludge drying granulating apparatus that feeding two is in parallel respectively, carry out sludge at low temperature mummification and granulation process, flue-gas temperature is 120 ~ 200 DEG C, and flue gas air quantity is 8 × 10
4~ 20 × 10
4m
3, the direction that flue gas sends into sludge drying granulating apparatus has two kinds, and a kind of is consistent with the direction that dewatered sludge advances, and another kind is contrary with the direction that dewatered sludge advances;
2) will from sewage work or river and lake dredging mud, sludge quality percentage water ratio is 75 ~ 85%, and by mud waggon, to pour wedge shape or the first half into be column Lower Half is the mud hopper of wedge shape, and the volume of mud hopper is 15 ~ 60m
3, after filling mud, the cover plate on hopper top is closed automatically;
3) Double-helix propeller of mud feed hopper bottom, by mud by being arranged on the division board of mud mouth, is all distributed into two handling equipments;
4) mud is sent into two sludge drying granulating apparatus in parallel by handling equipment respectively continuously and quantitatively, directly contact with heat smoke, carry out heat exchange reaction, sludge water content is evaporated, and self-assembling formation particle diameter is the mud granule of 1 ~ 10mm, long 22 ~ the 30m of sludge drying granulating apparatus, diameter 1.8 ~ 2.5m, rotating speed is 3 ~ 6 turns/min, obliquity is 1.5 ~ 2 °, heat exchanger time between mud and flue gas is 55 ~ 65min, dewatered sludge 30 ~ 100t/d, and percent mass water ratio is down to less than 40 ~ 45% from 75 ~ 85%;
5) mud granule after mummification is sent into stockyard by handling equipment, dewater further in process of cooling, until percent mass water ratio is down to less than 30%, burn together with coal as auxiliary fuel, or comprehensive utilization, the gas with foreign flavor of release is eliminated by bacteria bed;
6) after sludge drying, the tail gas given off from two sludge drying granulating apparatus in parallel, sends into multicyclone by induced draft fan, removes the dust of more than 90%, and then enter multilevel water curtains dedusting and desulfurizer, qualified discharge after dedusting degasification.
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| CN107572740A (en) * | 2017-09-26 | 2018-01-12 | 江苏中圣高科技产业有限公司 | A kind of sludge at low temperature desiccation burning integral method and system using fume afterheat |
| CN107500504A (en) * | 2017-10-20 | 2017-12-22 | 河南红东方化工股份有限公司 | A kind of high-efficiency and continuous dries sludge technology |
| CN110220204A (en) * | 2019-05-17 | 2019-09-10 | 武汉深能环保新沟垃圾发电有限公司 | A kind of system and method for waste incineration cooperatively processing sludge |
| CN110902998A (en) * | 2019-12-13 | 2020-03-24 | 天津五洲同创空调制冷设备有限公司 | Wet sludge drying process |
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| CN101643307A (en) * | 2009-08-25 | 2010-02-10 | 浙江大学 | Method for utilizing fume afterheat of cement plant to heat-dry sludge and prepare cement by firing sludge |
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| CN101643307A (en) * | 2009-08-25 | 2010-02-10 | 浙江大学 | Method for utilizing fume afterheat of cement plant to heat-dry sludge and prepare cement by firing sludge |
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