CN1300021C - Anhydration system for sludge by using remaining heat of flue gas from steam power plant - Google Patents

Anhydration system for sludge by using remaining heat of flue gas from steam power plant Download PDF

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CN1300021C
CN1300021C CNB2005100495541A CN200510049554A CN1300021C CN 1300021 C CN1300021 C CN 1300021C CN B2005100495541 A CNB2005100495541 A CN B2005100495541A CN 200510049554 A CN200510049554 A CN 200510049554A CN 1300021 C CN1300021 C CN 1300021C
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sludge
mud
power plant
drying kiln
flue gas
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CN1686878A (en
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翁焕新
苏闽华
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The present invention discloses a sludge drying system using the residual heat of smoke gas from a heat power plant. The sludge drying system is provided with a heat supply system, a sludge pretreatment system, a feeding system, a sludge drying and granulating system and a dust and gas removing system. In the present invention, sludge is dried through the residual heat of smoke gas from a heat power plant; consequently, basic conditions are provided for sanitizing, decreasing and reusing sludge from an urban sewage treatment plant, and sludge of a sewage treatment plant has reduced water content under the condition of no consumption of new energy resource. Sludge granules of hard texture are also formed so that a sludge drying and granulating process is realized with low economic cost, and the bottleneck problem that the sludge is hardly sanitized, decreased or reused due to high economic cost is solved. Actually, an efficient path for cyclic waste utilization and waste treatment by waste is opened up; obvious social and environmental benefit is generated, and economic benefit is obtained.

Description

Utilize the sludge drying system of remaining heat of flue gas from steam power plant
Technical field
The present invention relates to a kind of sludge drying system that utilizes remaining heat of flue gas from steam power plant.
Background technology
In order to protect existent environment of people, city domestic sewage and trade effluent must be through the processing of sewage work, could discharge after reaching state sewage emission standard, water surrounding is not polluted, and can be made the resource regeneration utilization.
Urban sewage treatment system comprises sewage disposal and sludge treatment two portions, China is to the treatment technology of city domestic sewage and trade effluent, the external imported technology of main employing, various water technologies are in the process that sewage is purified, most pollutents in the sewage are transferred in the mud, it is big that this mud that has determined sewage work to produce has quantity, and the characteristics of enrichment high density pollution thing and heavy metal.But, owing to also do not have a kind of effective sludge treatment technology to use for reference so far in the world, therefore, China's sludge from wastewater treatment plant is mainly taked the method for disposal that interim heap buries at present, cause under the sewage in the serious threat, particularly mud to ecotope and to ooze, be unable to estimate especially to the harm that groundwater resource bring, and in fact peri-urban can not have space and the place that is fit to stack this class mud, and the interim secondary environmental pollution problem of burying and producing of piling of mud is sharp-pointed day by day.Under the situation that mud harm increasingly sharpens, some places attempt to reach by burning the purpose of mud decrement, but sludge incineration facility investment volume height, energy-output ratio is big, and the working cost costliness adds that mud is when burning, can to atmospheric environment bring pollute and burn after residue reason such as still need dispose, according to the national conditions of China, sludge incineration is handled and is difficult to economically bear, and goes back imperfection technically.More local hope can be used for agricultural or greening with the mud as fertilizer sources, and still, each contained heavy metal species has limited soil to the adaptability (table 1) that mud utilizes in the mud, studies show that, removes 1mg/L from waste water
The content of heavy metal in the table 1 typical urban sludge of sewage treatment plant
Project Heavy metal (mg/kg) Remarks
Cu Pb Zn Cr Cd Ni As Hg
Mean value 326.6 192.9 2261 296.3 4.1 297.4 16.9 3.9 According to 4 years analysis data
Content range 236.2- 397.2 80.78- 314.0 69.5- 3790 27.9- 592.4 1.35- 7.2 57.5- 750.3 8.9- 31.9 0.8- 4.3
Heavy metal, will in mud, accumulate the heavy metal of 10000mg/L, their meeting enrichments in soil, and enter food chain by the absorption of crop, finally jeopardize the health of human body, even some mud is from sanitary sewage, though heavy metal content is lower, but the various medicaments that add in contained pathogenic agent and the sewage treatment process in the mud all can bring harm to environment.Some coastal city or those have and the city of waterway mutually, ocean, may adopt mud directly to throw the disposal method in sea, and this can pollute coastal waters; Marine ecosystems are threatened; therefore, this method is subjected to environment protection circle and the public's severe criticism, is prohibited.
Along with increasing rapidly of China's rapid economy development and urban population, the quantity of municipal effluent is constantly increasing, meanwhile people are more and more higher to the requirement of environmental quality, trade effluent and domestic sewage treating rate also will improve constantly, the quantity that this means sludge of sewage treatment plant will grow with each passing day, therefore, open up one municipal sludge carried out the effective way of innoxious, minimizing and recycling treatment, imperative.Practice shows sludge drying, it is the necessary process that realizes sewage treatment plant sludge harmless, minimizing and recycling treatment, mud from sewage work's generation, by mechanical dehydration, water ratio is generally between 75%-85%, by in the change process, if the water ratio of mud is dropped to below 20%, need to consume a large amount of energy, make that the cost of sludge drying is higher, thereby sewage sludge harmlessness, minimizing and recycling treatment are difficult to carry out.We utilize the sludge drying system of remaining heat of flue gas from steam power plant by foundation, make the cost of sludge drying be reduced to minimum level, thereby overcome traditional sludge drying cost height, and be difficult to carry out the bottleneck problem of sewage sludge harmlessness, minimizing and recycling treatment.
Summary of the invention
The purpose of this invention is to provide a kind of sludge drying sludge system that utilizes remaining heat of flue gas from steam power plant.
This system has heating system, mire preprocess system, feed system, sludge drying and granulating system, dedusting gas-freeing system; Heating system has first induced draft fan, joins by flue and air door, and air door joins with the first revolution drying kiln and the second revolution drying kiln respectively; Mire preprocess system has slot type heap mud field, is provided with the mixed machine that turns on slot type heap mud field; Feed system has portable pressure pump, portable pressure pump and joins with homogenizer, fixation pressure pump, banded extruder, Powder binding machine, first belt-bucket elevator and first opening for feed successively; Sludge drying and granulating system have the first revolution drying kiln, the first revolution drying kiln and join with cooling conveyor, cutting type pulverizer, second belt-bucket elevator, second opening for feed, the second revolution drying kiln, switch, travelling belt, vibratory screening apparatus and backflow conveying belt one end successively; The backflow conveying belt the other end and Powder binding machine join; The dedusting gas-freeing system has first tornado dust collector, second tornado dust collector, first tornado dust collector and the first revolution drying kiln join, second tornado dust collector and the second revolution drying kiln join, and first tornado dust collector and second tornado dust collector join with water dust scrubber, second induced draft fan, second vent-pipe and chimney successively by first vent-pipe.
This invention utilizes the remaining heat of flue gas from steam power plant dewatered sludge, not only innoxious, minimizing and the recycling treatment for sludge from wastewater treatment plant provides primary condition, make flue gas simultaneously in the process of dewatered sludge, by the revolution drying kiln, temperature has been reduced to 50-80 ℃, through tornado dust collector, enter water dust scrubber, pass through induced draft fan, send into chimney, reduced temperature significantly on the one hand, made flue dust obtain more effective control on the other hand, finally made the discharging of flue gas reach national atmospheric emission standard; Utilize the remaining heat of flue gas from steam power plant dewatered sludge, owing to adopt the two-section type anhydration system, even one of them revolution drying kiln needs maintenance, another revolution drying kiln still can make the smooth and easy discharge of flue gas, therefore can not influence heat power plant and normally move; The present invention makes mud obtain mummification under cold condition, thereby makes mud keep original calorific value (being the most important value that mud can be utilized as resource), and the mud granule after the mummification can be used as the auxiliary fuel of thermal power plant boiler fire coal.In addition, according to test-results, play the coagulating agent of consolidation in the mud, greater than 200 ℃ the time, begin volatilization, therefore, utilize the mud of residual heat from boiler fume mummification, guaranteed that the coagulating agent in the mud is not damaged, can play consolidation, thereby make the hardness of mud granule satisfy the technical requirements of firing light energy saving brick and producing the cement pressed brick, this mud granule also can be as the overburden soil of refuse landfill; Utilize the residual heat from boiler fume dewatered sludge, can be under the situation that need not consume new forms of energy, the water ratio of sludge of sewage treatment plant is reduced, and form scleroid mud granule, sludge drying and granulating process are moved under lower Financial cost, be difficult to be put to actual bottleneck problem thereby overcome because of the economic cost height makes sewage sludge harmlessness, minimizing and recycling treatment.In fact this opened up a cyclic utilization of waste, the effective way of the treatment of wastes with processes of wastes against one another, not only can produce significant social and environmental benefit, and can obtain tangible economic benefit, the present invention has dropped into practice on Jiangyin, Jiangsu and Changshu and other places, practice shows, adopts this technology not only to make industry and sanitary sewage mud obtain effectively innoxious and recycling treatment, and make the complete qualified discharge of flue gas, obtain significant social, environment and economic triple benefit.
Description of drawings
Accompanying drawing is the sludge drying system structural representation that utilizes remaining heat of flue gas from steam power plant, among the figure: first induced draft fan 1, flue 2, air door 3, portable pressure pump 4, homogenizer 5, fixation pressure pump 6, banded extruder 7, Powder binding machine 8, first belt-bucket elevator 9, first opening for feed 10, the first revolution drying kiln 11, the second revolution drying kiln 12, cold conveying belt 13, cutting type pulverizer 14, second belt-bucket elevator 15, second opening for feed 16, switch 17, travelling belt 18, vibratory screening apparatus 19, backflow conveying belt 20, first tornado dust collector 21, second tornado dust collector 22, first vent-pipe 23, water dust scrubber 24, second induced draft fan 25, second vent-pipe 26, mud is stacked field 27, turn over the machine 28 that mixes.
Embodiment
Utilize the sludge drying system of remaining heat of flue gas from steam power plant to have heating system, mire preprocess system, feed system, sludge drying and granulating system, dedusting gas-freeing system.Heating system has first induced draft fan 1, with the 100-150 ℃ of flue gas through electrostatic precipitator, by flue 2, by air door 3 control exhaust gas volumns, sends into the first revolution drying kiln 11 and the second revolution drying kiln 12 respectively; Mire preprocess system has slot type heap mud field 27, is provided with the machine 28 that mixes that turns on slot type heap mud field; Feed system has portable pressure pump 4, portable pressure pump and joins with homogenizer 5, fixation pressure pump 6, banded extruder 7, Powder binding machine 8, first belt-bucket elevator 9 and first opening for feed 10 successively; Sludge drying and granulating system have the first revolution drying kiln 11, first the revolution drying kiln 11 successively with cooling conveyor 13, cutting type pulverizer 14, second belt-bucket elevator 15, second opening for feed 16, the second revolution drying kiln 12, switch 17, travelling belt 18, one end of vibratory screening apparatus 19 and backflow conveying belt 25 joins, the other end of backflow conveying belt 25 and Powder binding machine 8 join, wherein the cutting type pulverizer becomes compliant mud cutting and grinding the particle of particle diameter 6~7mm, switch is used for controlling from second and turns round the mud throughput direction that drying kiln comes out, if the water ratio of mud does not also reach requirement, switch is delivered to cooling conveyor 13 with the mud switching, reflux once more and enter the second revolution drying kiln, if the water ratio of mud has reached requirement, switch is delivered to vibratory screening apparatus 19 with the mud switching, mud after the mummification is a shape, particle diameter is a finished product greater than the granule of 1mm, can fully utilize, particle diameter less than the particle of 1mm by backflow conveying belt 20, as the powder of wrapping up in of strip mud; The dedusting gas-freeing system has first tornado dust collector 21, second tornado dust collector 22, first tornado dust collector 21 and the first revolution drying kiln 11 join, second tornado dust collector 22 and the second revolution drying kiln 12 join, and first tornado dust collector and second tornado dust collector join with water dust scrubber 24, second induced draft fan 25, second vent-pipe 26 and chimney successively by first vent-pipe 23.
The apparatus structure of this system is by heating system, mire preprocess system, and feed system, mummification and granulating system, the dedusting gas-freeing system, seven parts such as cooling handling equipment and screening plant are formed, and the concrete member of each part is as follows:
1. heating system with the thermal power plant boiler flue gas, after the electrostatic precipitator dedusting, is delivered to respectively in two revolution drying kilns by flue with induced draft fan, utilizes fume afterheat (temperature is 130~170 ℃) to carry out two-section type sludge drying and granulating.
2. mire preprocess system is 75~85% sludge from wastewater treatment plant with water content at mud stacks and stacked 2-5 days, and the effect by turning over the machine of mixing evaporates a part of moisture content, improves the sludge drying effect.
3. feed system, use portable pressure pump, to send into even machine through pretreated mud, make dissimilar mud homogenizing, by the fixation pressure pump mud after even be sent into banded extruder again, mud is made the bar column that diameter is 0.6~1.0mm, and by Powder binding machine, the mummification fine powder mud with refluxing makes bar column mud wrap up in powder, avoid being stained with mutually sticking, with belt-bucket elevator mud is sent into mummification and granulating system from opening for feed then.
4. mummification and granulating system, by two revolution drying kilns that volume is different, cutting type pulverizer and switch are formed, first revolution drying kiln diameter is 2.0~2.4m, length is 20~26m, second revolution drying kiln diameter is 1.8~2.2m, length is 18~24m, the cutting type pulverizer can be ground into the particle that particle diameter is 6~7cm with the big mud granule of plasticity, mud mummification in the revolution drying kiln, and natural granulating, switch is used for controlling from second and turns round the mud throughput direction that drying kiln comes out, if the water ratio of mud does not also reach requirement, switch is delivered to cooling conveyor with the mud switching, refluxes once more to enter the second revolution drying kiln, if the water ratio of mud has reached requirement, switch is delivered to vibratory screening apparatus with the mud switching.
5. dedusting gas-freeing system, form by two tornado dust collector, a water dust scrubber and an induced draft fan, afterbody at two revolution drying kilns is installed two tornado dust collector, remove most of dust of tail gas, by water dust scrubber, induced draft fan is used in further dedusting degasification then again, to reach the tail gas of atmospheric emission standard, send into chimney.
6. the cooling handling equipment by being installed in the fully sheathed case top, becomes several cold wind spray jets of miter angle and conveying belt to form with the mud working direction.Mud in the process that is transported to the second revolution drying kiln, through the cold wind stripping, can play the effect of further dehydration after coming out from the first revolution drying kiln in accelerating cooling process, residual gas further is eliminated.
7. screening system; after mud comes out from the second revolution drying kiln; through vibratory screening apparatus; the mud granule of particle diameter less than 1mm refluxed as wrapping up in powder; particle diameter can be used as the raw material of firing light energy saving brick and producing cement pressing products greater than the mud granule of 1mm, also can be used as the auxiliary fuel and the refuse landfill overburden soil of heating stove.

Claims (5)

1. a sludge drying system that utilizes remaining heat of flue gas from steam power plant is characterized in that, it has heating system, mire preprocess system, feed system, sludge drying and granulating system, dedusting gas-freeing system; Heating system has first induced draft fan (1), joins by flue (2) and air door (3), and air door (3) joins with the first revolution drying kiln (11) and the second revolution drying kiln (12) respectively; Mire preprocess system has slot type heap mud field (27), is provided with the mixed machine (28) that turns on slot type heap mud field; Feed system has portable pressure pump (4), portable pressure pump (4) and joins with homogenizer (5), fixation pressure pump (6), banded extruder (7), Powder binding machine (8), first belt-bucket elevator (9) and first opening for feed (10) successively; Sludge drying and granulating system have the first revolution drying kiln (11), the first revolution drying kiln (11) and join with cooling conveyor (13), cutting type pulverizer (14), second belt-bucket elevator (15), second opening for feed (16), the second revolution drying kiln (12), switch (17), travelling belt (18), vibratory screening apparatus (19) and backflow conveying belt (20) one ends successively; Backflow conveying belt (20) the other end and Powder binding machine (8) join; The dedusting gas-freeing system has first tornado dust collector (21), second tornado dust collector (22), first tornado dust collector (21) join with the first revolution drying kiln (11), second tornado dust collector (22) join with the second revolution drying kiln (12), and first tornado dust collector and second tornado dust collector join with water dust scrubber (24), second induced draft fan (25), first vent-pipe (26) and chimney successively by first vent-pipe (23).
2. a kind of sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, described first revolution drying kiln diameter is 2.0~2.4m, and length is 20~26m.
3. a kind of sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, described second revolution drying kiln diameter is 1.8~2.2m, and length is 18~24m.
4. a kind of sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, described cutting type pulverizer becomes compliant mud cutting and grinding the particle of particle diameter 6~7mm.
5. a kind of sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, described cooling conveyor (13) top is provided with a plurality of cold wind spray jets.
CNB2005100495541A 2005-04-04 2005-04-04 Anhydration system for sludge by using remaining heat of flue gas from steam power plant Active CN1300021C (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100364906C (en) * 2006-02-17 2008-01-30 浙江大学 Method for drying sludge using combined flume residual heat and supplied heat
CN100429166C (en) * 2006-04-04 2008-10-29 浙江大学 Sludge drying system using combination of smoke residual heat and external heat supply source
CN100462316C (en) * 2007-06-05 2009-02-18 浙江大学 Sludge storing and preheating system utilizing sludge drying tail gas afterheat
CN102167488B (en) * 2011-01-21 2012-11-21 上海伏波环保设备有限公司 Non-contact type sludge drying system utilizing flue gas afterheat
CN102531317B (en) * 2011-05-16 2013-06-19 南京鑫翔新型建筑材料有限责任公司 Sludge drying system
CN109107494A (en) * 2018-09-30 2019-01-01 江苏润翔环保设备有限公司 A kind of pelletizer for sludge drying

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2632085Y (en) * 2003-06-04 2004-08-11 清华同方股份有限公司 Movable sludge treating apparatus by drying process
CN1587127A (en) * 2004-07-08 2005-03-02 浙江大学 Reflux type temperature controllable sludge drying device and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2632085Y (en) * 2003-06-04 2004-08-11 清华同方股份有限公司 Movable sludge treating apparatus by drying process
CN1587127A (en) * 2004-07-08 2005-03-02 浙江大学 Reflux type temperature controllable sludge drying device and method

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Application publication date: 20051026

Assignee: Hangzhou Xinyuan Environmental Engineering Co., Ltd.

Assignor: Zhejiang University

Contract record no.: 2015330000003

Denomination of invention: Anhydration system for sludge by using remaining heat of flue gas from steam power plant

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