CN1314606C - Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant - Google Patents
Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant Download PDFInfo
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- CN1314606C CN1314606C CNB2005100495560A CN200510049556A CN1314606C CN 1314606 C CN1314606 C CN 1314606C CN B2005100495560 A CNB2005100495560 A CN B2005100495560A CN 200510049556 A CN200510049556 A CN 200510049556A CN 1314606 C CN1314606 C CN 1314606C
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Abstract
The present invention discloses a serial connection type sludge drying system using the residual heat of smoke gas from a heat power plant, which 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 the harmless amount reducing resource treatment of 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 harmless amount reducing resource treatment of sludge can hardly be put into practice due to high economic cost is solved; actually, an efficient path for cyclic waste utilization and waste treatment by waste is opened up; not only is obvious social and environmental benefit generated, but also obvious economic benefit is obtained.
Description
Technical field
The present invention relates to a kind of tandem 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 water treatment 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 with the mud as fertilizer sources, be used for agricultural or greening, but, each contained heavy metal species has limited soil to the adaptability (table 1) that mud utilizes in the mud, studies show that, removes the heavy metal of 1mg/L from waste water, will in mud, accumulate the heavy metal of 10000mg/L, their understand enrichment in soil, and enter food chain by the absorption of crop, finally jeopardize
The content of heavy metal in the table 1 typical urban sludge of sewage treatment plant
The health of human body, though some mud from sanitary sewage, though heavy metal content is lower, 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.
| 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 | |
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 generally between 75%-85%, passes through drying 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 tandem 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, second induced draft fan, first induced draft fan joins by first flue and first air door, first air door joins with the first revolution drying kiln and the second revolution drying kiln respectively, second induced draft fan joins by second flue and second air door, and second air door joins with the 3rd revolution drying kiln and the 4th 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 first belt-bucket elevator, and first belt-bucket elevator joins with press-down type banded extruder, Powder binding machine, second 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 first cooling conveyor, the 3rd belt-bucket elevator, second opening for feed, the second revolution drying kiln, the second cooling conveyor travelling belt, cutting type pulverizer, garden dish tablets press, the 3rd belt-bucket elevator, the 3rd opening for feed, the 3rd revolution drying kiln, the 3rd cooling conveyor travelling belt, belt-bucket elevator, the 4th opening for feed, the 4th revolution drying kiln, vibratory screening apparatus, backflow conveying belt successively, and backflow conveying belt and Powder binding machine join; The dedusting gas-freeing system has first tornado dust collector, second tornado dust collector, the 3rd tornado dust collector, the 4th 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, the 3rd tornado dust collector and the 3rd revolution drying kiln join, the 4th tornado dust collector and the 4th revolution drying kiln join, first tornado dust collector and second tornado dust collector by first vent-pipe successively with first water dust scrubber, the 3rd induced draft fan, second vent-pipe and chimney join, the 3rd tornado dust collector and the 4th tornado dust collector by the 3rd vent-pipe successively with second water dust scrubber, the 3rd induced draft fan, second vent-pipe and chimney join.
The present 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 adopted the tandem anhydration system, even there is the revolution drying kiln to need maintenance, other 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 make mud keep original calorific value (being the most important value that mud can be utilized as resource), mud granule after the mummification can be used as the auxiliary fuel of thermal power plant boiler fire coal, also can be used as the overburden soil of refuse landfill.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; 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, mud drying process is 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 tandem sludge drying system structural representation that utilizes remaining heat of flue gas from steam power plant, among the figure: first induced draft fan 1; first flue 2; first air door 3; the two or two induced draft fan 4; second flue 5; second air door 6; first belt-bucket elevator 7; press-down type banded extruder 8; Powder binding machine 9; second belt-bucket elevator 10; first opening for feed 11; the first revolution drying kiln 12; the first cold conveying belt 13; the 3rd belt-bucket elevator 14; second opening for feed 15; the second revolution drying kiln 16; the second cold conveying belt 17; cutting type pulverizer 18; garden dish tablets press 19; the 4th belt-bucket elevator 20; the 3rd opening for feed 21; the 3rd revolution drying kiln 22; the 3rd cold conveying belt 23; chapelet 24; the 4th opening for feed 25; the 4th revolution drying kiln 26; vibratory screening apparatus 27; backflow conveying belt 28; first tornado dust collector 29; second tornado dust collector 30; the 3rd tornado dust collector 31; the 4th tornado dust collector 32; first vent-pipe 33; first water dust scrubber 34; second induced draft fan 35; second vent-pipe 36; the 3rd vent-pipe 37; second water dust scrubber 38; the 3rd induced draft fan 39; mud is stacked field 40; turn over the machine 41 that mixes.
Embodiment
As shown in drawings, utilize the tandem 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, second induced draft fan 4, first induced draft fan 1 is with the 100-150 ℃ of flue gas through electrostatic precipitator, by first flue 2,, send into the first revolution drying kiln 12 and the second revolution drying kiln 16 respectively by first air door, 3 control exhaust gas volumns, second induced draft fan 4 is with the 100-150 ℃ of flue gas through electrostatic precipitator, by second flue 5,, send into the 3rd revolution drying kiln 22 and the 4th revolution drying kiln 26 respectively by second air door, 6 control exhaust gas volumns; Mire preprocess system has slot type heap mud field 40, is provided with the machine 41 that mixes that turns on slot type heap mud field; Feed system has first belt-bucket elevator, 7, the first belt-bucket elevators 7 and joins with press-down type banded extruder 8, Powder binding machine 9, second belt-bucket elevator 10 and first opening for feed 11 successively; Sludge drying and granulating system have the first revolution drying kiln 12, first the revolution drying kiln 12 successively with first cooling conveyor 13, the 3rd belt-bucket elevator 14, second opening for feed 15, the second revolution drying kiln 16, the second cooling conveyor travelling belt 17, cutting type pulverizer 18, garden dish tablets press 19, the 3rd belt-bucket elevator 20, the 3rd opening for feed 21, the 3rd revolution drying kiln 22, the 3rd cooling conveyor travelling belt 23, belt-bucket elevator 24, the 4th opening for feed 25, the 4th revolution drying kiln 26, vibratory screening apparatus 27, one end of backflow conveying belt 28 joins, the other end of backflow conveying belt 28 and Powder binding machine 9 join, and wherein the cutting type pulverizer becomes the particle of particle diameter less than 6～7mm with compliant mud cutting and grinding; The dedusting gas-freeing system has first tornado dust collector 29, second tornado dust collector 30, the 3rd tornado dust collector 31, the 4th tornado dust collector 32, first tornado dust collector 29 and the first revolution drying kiln 12 join, second tornado dust collector 30 and the second revolution drying kiln 16 join, the 3rd tornado dust collector 31 and the 3rd revolution drying kiln 22 join, the 4th tornado dust collector 32 and the 4th revolution drying kiln 26 join, first tornado dust collector and second tornado dust collector by first vent-pipe 33 successively with first water dust scrubber 34, the 3rd induced draft fan 35, second vent-pipe 36 and chimney join, the 3rd tornado dust collector 31 and the 4th tornado dust collector 32 by the 3rd vent-pipe 37 successively with second water dust scrubber 38, the 3rd induced draft fan 39, second vent-pipe 36 and chimney join.
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 each revolution drying kiln by flue with induced draft fan, utilizes fume afterheat (temperature is 130～170 ℃) to carry out the tandem sludge drying.
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, to send into the press-down type banded extruder through pretreated mud with belt-bucket elevator, mud is made the bar column that diameter is 0.6～1.0mm, and pass through Powder binding machine, with the mummification fine powder mud that refluxes, make 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 then.
4. mummification and granulating system; by four revolution drying kilns that volume is different; cutting type pulverizer and garden dish tablets press are formed; the first kiln body diameter is 2.0～2.4m; length is 22.0～26.0m; second revolution drying kiln diameter is 1.8～2.2m; length is 20～24m; the 3rd kiln body diameter is 1.6～2.0m; length is 18～22m; the 4th kiln body diameter is 1.4～1.8m, and length is 16～20m, and it is the particle of 6-7cm that the cutting type pulverizer can become particle diameter with the big mud granule cutting and grinding of plasticity; behind the dish tablets press of garden, can increase the garden degree and the intensity of mud granule.
5. dedusting gas-freeing system, form by four tornado dust collector, two water dust scrubbers and two induced draft fans, afterbody at four revolution drying kilns is installed four tornado dust collector, remove most of dust of tail gas, by two water dust scrubbers, two induced draft fans are 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.After mud comes out from the first revolution drying kiln, in the process that is transported to the second revolution drying kiln, after mud comes out from the second revolution drying kiln, in the process that is transported to the 3rd revolution drying kiln, and mud is after drying kiln comes out from the 3rd revolution, in the process that is transported to the 4th revolution drying kiln, through the cold wind stripping, in accelerating cooling process, can play the effect of further dehydration, 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 of heating stove and the overburden soil of refuse landfill.
Claims (6)
1. tandem sludge drying system that utilizes remaining heat of flue gas from steam power plant, it is characterized in that having heating system, mire preprocess system, feed system, sludge drying and granulating system, the dedusting gas-freeing system, heating system has first induced draft fan (1), second induced draft fan (4), first induced draft fan (1) joins by first flue (2) and first air door (3), first air door (3) joins with the first revolution drying kiln (12) and the second revolution drying kiln (16) respectively, second induced draft fan (4) joins by second flue (5) and second air door (6), and second air door (6) joins with the 3rd revolution drying kiln (22) and the 4th revolution drying kiln (26) respectively; Mire preprocess system has slot type heap mud field (40), is provided with the mixed machine (41) that turns on slot type heap mud field; Feed system has first belt-bucket elevator (7), and first belt-bucket elevator (7) joins with press-down type banded extruder (8), Powder binding machine (9), second belt-bucket elevator (10) and first opening for feed (11) successively; Sludge drying and granulating system have the first revolution drying kiln (12), first the revolution drying kiln (12) successively with first cooling conveyor (13), the 3rd belt-bucket elevator (14), second opening for feed (15), the second revolution drying kiln (16), the second cooling conveyor travelling belt (17), cutting type pulverizer (18), garden dish tablets press (19), the 3rd belt-bucket elevator (20), the 3rd opening for feed (21), the 3rd revolution drying kiln (22), the 3rd cooling conveyor travelling belt (23), belt-bucket elevator (24), the 4th opening for feed (25), the 4th revolution drying kiln (26), vibratory screening apparatus (27), one end of backflow conveying belt (28) joins, and the other end of backflow conveying belt (28) and Powder binding machine (9) join; The dedusting gas-freeing system has first tornado dust collector (29), second tornado dust collector (30), the 3rd tornado dust collector (31), the 4th tornado dust collector (32), first tornado dust collector (29) join with the first revolution drying kiln (12), second tornado dust collector (30) join with the second revolution drying kiln (16), the 3rd tornado dust collector (31) join with the 3rd revolution drying kiln (22), the 4th tornado dust collector (32) join with the 4th revolution drying kiln (26), first tornado dust collector and second tornado dust collector by first vent-pipe (33) successively with first water dust scrubber (34), the 3rd induced draft fan (35), second vent-pipe (36) and chimney join, the 3rd tornado dust collector (31) and the 4th tornado dust collector (32) by the 3rd vent-pipe (37) successively with second water dust scrubber (38), the 3rd induced draft fan (39), second vent-pipe (36) and chimney join.
2. a kind of tandem sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, the described first revolution drying kiln kiln body diameter is 2.0～2.4m, and length is 22.0～26.0m.
3. a kind of tandem sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, the described second revolution drying kiln kiln body diameter is 1.8～2.2m, and length is 20～24m.
4. a kind of tandem sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, described the 3rd revolution drying kiln kiln body diameter is 1.6～2.0m, and length is 18～22m.
5. a kind of tandem sludge drying system that utilizes remaining heat of flue gas from steam power plant according to claim 1 is characterized in that, described the 4th revolution drying kiln kiln body diameter is 1.4～1.8m, and length is 16～20m.
6. a kind of tandem 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 top is provided with a plurality of cold wind spray jets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100495560A CN1314606C (en) | 2005-04-04 | 2005-04-04 | Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100495560A CN1314606C (en) | 2005-04-04 | 2005-04-04 | Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant |
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| CN1686879A CN1686879A (en) | 2005-10-26 |
| CN1314606C true CN1314606C (en) | 2007-05-09 |
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| CNB2005100495560A Expired - Fee Related CN1314606C (en) | 2005-04-04 | 2005-04-04 | Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364907C (en) * | 2006-04-04 | 2008-01-30 | 浙江大学 | Sludge drying system using combination of smoke residual heat and two external heat supply sources |
| CN100457656C (en) * | 2006-07-04 | 2009-02-04 | 浙江大学 | Series type energy-saving sludge drying and granulating system |
| 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 |
| CN104628237B (en) * | 2015-01-23 | 2017-02-22 | 广东电网有限责任公司电力科学研究院 | Sludge drying incineration system based on thermal power plant |
Citations (3)
| 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 |
| CN2816032Y (en) * | 2005-04-04 | 2006-09-13 | 浙江大学 | Series sludge-drying system using after heat of smoke from steam power plant |
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Patent Citations (3)
| 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 |
| CN2816032Y (en) * | 2005-04-04 | 2006-09-13 | 浙江大学 | Series sludge-drying system using after heat of smoke from steam power plant |
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