CN100364906C - Method for drying sludge using combined flume residual heat and supplied heat - Google Patents
Method for drying sludge using combined flume residual heat and supplied heat Download PDFInfo
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- CN100364906C CN100364906C CNB2006100495264A CN200610049526A CN100364906C CN 100364906 C CN100364906 C CN 100364906C CN B2006100495264 A CNB2006100495264 A CN B2006100495264A CN 200610049526 A CN200610049526 A CN 200610049526A CN 100364906 C CN100364906 C CN 100364906C
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Abstract
The present invention discloses an energy source sludge drying method with the combing use of the residual heat of smoke gas and an externally supplied heat supply source. In the method, sludge of a sewage treatment plant is dried in a two stage type drying process mainly through the residual heat of flue gas of a boiler and a heat source provided by burnt coal of a fluidized bed furnace; consequently, sludge granules with hard texture, which have the granule diameter of 0.5 to 8 millimeters, are formed, and the sludge granules can be used as auxiliary fuels of fired coal and can also be used for burning light energy-saving bricks and producing cement pressing products. The method enables the resources of the residual heat of flue gas in a small scale to be applied to sludge drying so that the treatment cost for sludge drying in a sewage treatment plant is reduced; actually, a new path for cyclic waste utilization and waste treatment by waste is developed. The method is already put into practice in Tongxiang, Zhejiang province; practice indicates that the effective harmless resource treatment of sludge of a sewage treatment plant is realized when the technology is used, obvious social benefit and environmental benefit are generated, and obvious economic benefit is obtained.
Description
Technical field
The present invention relates to a kind of method of utilizing the energy dewatered sludge that fume afterheat combines with outer supplying heat source.
Background technology
The continuous reinforcement that improves constantly and protect environment for human survival consciousness along with people's living standard; city domestic sewage and trade effluent must be through the processing of sewage work; could discharge after reaching state sewage emission standard, become a kind of engineering measure of mandatory protection environment.
The function of municipal sewage plant should comprise: purify waste water (1), makes city domestic sewage and trade effluent after treatment, qualified discharge; (2) dispose the mud that in sewage treatment process, produces safely, prevent that mud from causing secondary environmental pollution.The commitment of city domestic sewage and trade effluent being handled in China mainly by introducing and digesting external water technology, through utilization and practice in recent ten years, reaches its maturity the sewage disposal technology of China.All kinds of sewage are in being purified the process of processing, a part of pollution substance in the sewage obtains decomposing, and most of pollutent is transferred in the mud, this just makes sewage work all will produce a large amount of mud every day, and the mud that produces in this sewage treatment process, have the characteristics of high-moisture percentage and enrichment high density pollution thing and heavy metal, therefore, how to make this class mud can access safe disposal and processing, a difficult problem becomes international.Developed country faces this difficult problem than us and takes Zao 20 years, although they are making huge effort in order to solve this difficult problem on the financial resources He on the manpower, roughly set up sanitary landfill, soil utilization, burning and throwing sea etc. and disposed sludge treatment method, but, it seems today these method for sludge treatment not only technology itself have bigger defective, and implement and can bring bigger environment negative effect.Particularly in China, the turnout of mud is very big, according to according to a preliminary estimate, the existing mud year output in the whole nation is above 100,000,000 tons, annual also with 1 15 speed increment, if adopt mud sanitary landfill method, and do not talk the mud transportation and the landfill expense very high, peri-urban is the space of suitable mud landfill not at all; If adopt the mud soil to utilize, being about to mud is developed to fertilizer and uses on agricultural, China's municipal sewage treatment adopts city domestic sewage and trade effluent to merge the method for handling more, therefore contain a large amount of heavy metals and persistence hazardous and noxious substances in the mud, even some mud is from sanitary sewage, although heavy metal content is lower, but the various medicaments that add in contained pathogenic agent and the sewage treatment process in the mud, harm is brought to environment in the capital, produce fertilizer with mud, on agricultural, use and to produce bad consequence, hazardous and noxious substances in the mud and heavy metal can enrichments in soil, and enter food chain by the absorption of crop, finally are detrimental to health, even be used for afforestation, also can destroy ecotope because of build-up effect; Though burn and to make the obvious decrement of mud, but because the burning facility investment is big, energy-output ratio is big, therefore make the cost of sludge treatment per ton at least more than 400 yuan, and also processing once more of the residue after burning, according to the national conditions of China, this is difficult to bear economically, moreover, the caused Air Pollution Control of sludge incineration requires very high, is difficult to avoid producing dioxin in the particularly sludge incineration process, this technically also difficulty reach requirement; Mud is thrown the sea disposal and is forbidded strictly by environmental protection department.As described above, common in the world these method for sludge treatment that adopt, so far also do not have at home a kind ofly to be considered to effective sludge treatment technology and can to use for reference, therefore, China's sludge from wastewater treatment plant is mainly taked the method for disposal that interim heap buries at present, this causes serious threat to ecotope, particularly ooze under the sewage in the mud, 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, the interim secondary environmental pollution problem of burying and producing of piling of mud is sharp-pointed day by day, the interim place of burying of piling of mud need be found as early as possible on the one hand because of the ever-increasing pressure of sludge quantity in some area; In a single day the interim heap of the mud resident that buries the place periphery recognizes the damaging influence of mud to living environment on the other hand, refusal mud heap buries, existing mud heap is buried the field, numerous and confused economic compensation to local government or enterprise's proposition great number, consequent contradiction has become the social factors of instability.
Along with increasing rapidly of China's rapid economy development and urban population, the quantity of municipal effluent is constantly increasing, meanwhile people are also 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, it is very urgent to open up an effective sludge treatment approach.Current, both at home and abroad innoxious, minimizing and resource utilization as the ultimate aim that municipal sludge is thoroughly handled, practice also proof is only being carried out on the basis of minimizing mud, and then realizes innoxious and recycling treatment, could finally reach the target that mud is thoroughly handled; Practice shows that simultaneously the mud from sewage work produces passes through mechanical dehydration, water ratio is generally between 75%-85%, therefore have only at first promptly that safety realizes sludge drying again economically, make mud decrement after, could successfully carry out innoxious and recycling treatment to sludge of sewage treatment plant.Pass through drying process, if the water ratio of mud is dropped to below 30%, can make the volume of mud reduce to water ratio is 80% below 1/3rd of sludge volume, but, this need consume a large amount of energy, make that the cost of sludge drying is higher, thereby limited the enforcement of sewage sludge harmlessness, minimizing and recycling treatment.In order to reduce the sludge drying processing cost significantly, sewage sludge harmlessness and recycling treatment are achieved, we had once proposed to utilize the patent of invention technology of remaining heat of flue gas from steam power plant dewatered sludge, by setting up the tandem sludge drying system, the water ratio of mud is reduced to below 30%, sludge volume is reduced to below 1/3rd of original volume, mud after the mummification forms hard water-fast of quality naturally, preserved more than 90 percent of the original calorific value of mud simultaneously, become the intermediates of comprehensive utilization of mud, and the cost that makes sludge drying is reduced to minimum level, thereby overcome traditional sludge drying cost height, be difficult to carry out sewage sludge harmlessness, the bottleneck problem of minimizing and recycling treatment has been opened up a cyclic utilization of waste, the effective way of the treatment of wastes with processes of wastes against one another.The comprehensive assessment of this technology after the concrete enforcement in Jiangyin, Jiangsu shows, both realized the zero processing cost of sludge drying, the mud landfill takes and the sludge resource comprehensive utilization has produced tangible economic benefit because of saving again, thereby has obtained significant social, environment and economic triple benefit.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing the energy dewatered sludge that fume afterheat combines with outer supplying heat source.
A kind of method steps of the energy dewatered sludge that fume afterheat combines with outer supplying heat source that utilizes is:
1) be that the mud that 75～85% sewage works produce turns over mixed evaporation 2～5 days in the stacking field with water content, 1～5% of total water content is fallen in spontaneous evaporation;
2) will to mix evaporation back water content be 70～80% sludge of sewage treatment plant through turning over, by feed system, make it be dispersed, be admitted to by the fluidizing furnace fire coal outer thermal source is provided, temperature is 300～400 ℃ the first oven dry rotary kiln, carries out first section mummification, removes 20～35% of total water content;
3) above-mentioned mud goes out the first oven dry rotary kiln, by cooling conveyor, and through the cutting type pulverizer, is admitted to the energy from the stack gas waste heat, and temperature is 130～220 ℃ the second oven dry rotary kiln, carries out second section mummification, removes 15～25% of total water content;
4) through after the above-mentioned two-section type mummification, dry the mud that rotary kiln comes out from second, be a shape, particle diameter is 0.5～8mm, total water ratio has been reduced to 15～30%, by vibratory screening apparatus, with particle diameter less than 2mm and particle diameter mud granule greater than 5mm, as the auxiliary fuel of outer supplying heat source fire coal, particle diameter is the raw material that light energy saving brick and production cement pressed brick are fired in the mud granule conduct of 2～5mm.
Described step 2) first revolution drying kiln diameter in is 1.8～2.4m, and length is 20～28m.
Second revolution drying kiln diameter in the step 3) is 1.6～2.2m, and length is 18～28m.
Another kind utilizes the step of the method for the energy dewatered sludge that fume afterheat and outer supplying heat source combine to be:
1) be that the mud that 75～85% sewage works produce turns over mixed evaporation 2～5 days in the stacking field with water content, 1～5% of total water content is fallen in spontaneous evaporation;
2) will to mix evaporation back water content be 70～80% sludge of sewage treatment plant through turning over, by feed system, make it be dispersed, be admitted to by the fluidizing furnace fire coal outer thermal source is provided, temperature is 300～400 ℃ the first oven dry rotary kiln, carries out first section mummification, removes 20～35% of total water content;
3) will to mix evaporation back water content be 70～80% sludge of sewage treatment plant through turning over, by feed system, make it be dispersed, be admitted to by the fluidizing furnace fire coal outer thermal source is provided, temperature is 300～400 ℃ the second oven dry rotary kiln, carries out first section mummification, removes 20～35% of total water content;
4) above-mentioned mud goes out the first and second oven dry rotary kilns, by cooling conveyor, and through the cutting type pulverizer, be admitted to the energy from the stack gas waste heat, temperature is 130～220 ℃ the 3rd an oven dry rotary kiln, carries out second section mummification, removes 15～25% of total water content;
5) through after the above-mentioned two-section type mummification, dry the mud that rotary kiln comes out from the 3rd, be a shape, particle diameter is 0.5～8mm, total water ratio has been reduced to 15～30%, by vibratory screening apparatus, with particle diameter less than 2mm and particle diameter mud granule greater than 5mm, as the auxiliary fuel of outer supplying heat source fire coal, particle diameter is that the mud granule of 2～5mm can be used as the raw material of firing light energy saving brick and producing the cement pressed brick.
Described step 2), 3) in the first and second revolution drying kiln diameters be 1.8～2.4m, length is 20～28m.The 3rd revolution drying kiln diameter in the step 4) is 1.6～2.2m, and length is 18～28m.
The fume afterheat resource of mentioning among the present invention can be from single stack gas, also can be from a plurality of stack gases.
The present invention is come into operation in the Tongxiang, Zhejiang, and practice shows that this technology makes the fume afterheat resource of three boilers: 150～220 ℃ of flue-gas temperatures, the total blast volume of three boiler smokes are 50000～80000m
3/ hour, form compound energy with the coal-fired heat that produces of fluidizing furnace, 150～200 tons of mummification every day sludge of sewage treatment plant (water ratio 75～80%), the water ratio that makes mud is reduced to 15～30% drying and other treatment cost from 75～80%, than the heat energy dewatered sludge that produces by the fluidizing furnace fire coal fully, saving 20～40% per ton.
Embodiment
According to our understanding in depth, many places have the less fume afterheat resource of more scale, these fume afterheat resources have from the less heat power plant's stack gas of exhaust gas volumn, the stack gas that has from various boiler emissions, owing to disperseing and measuring little, can not satisfy the mud energy needed requirement of mummification some amount, therefore difficulty is utilized.In order to make this part fume afterheat resource also can be used in sludge drying, when we have proposed dewatered sludge, on the basis that the fume afterheat resource that can utilize obtains utilizing fully, for the mud of wanting the mummification some amount and the insufficient energy, the method that employing adds supplying heat source remedies, thereby realize available fume afterheat resource is fully utilized, can satisfy the purpose of mummification some amount mud again.
The present invention mainly is the energy that utilizes fume afterheat to combine with outer supplying heat source, by the two-section type drying process, makes sludge of sewage treatment plant obtain mummification, and the formation particle diameter is the hard mud granule of 0.5-8 millimeter.This mud granule can be used as coal-fired auxiliary fuel, also can be used as the raw material of firing light energy saving brick and producing cement pressing products.
First kind of situation is that a day processing sludge quantity is 50～100 tons (moisture percentage in sewage sludge 75～85%).With water ratio is the mud that 75～85% sewage works produce, turn in the stacking field earlier and mix evaporation 2～5 days, spontaneous evaporation fall total water content 1～5% after, pass through feed system, make mud be dispersed, favourablely so fully contact with hot blast, thereby improve the mummification efficient of mud with mud.Being admitted to then and providing thermal source, temperature by the fluidizing furnace fire coal is that 300～400 ℃, diameter are that 1.8～2.4m and length are the first oven dry rotary kiln of 20～28m, carries out first section mummification, removes 20～30% of total water content; Mud comes out from the first oven dry rotary kiln, by cooling conveyor, makes mud comparatively fast heat radiation in the process that is transferred, take off part moisture content after, be admitted to the energy from being 30000～100000m through boiler flue, exhaust gas volumn after the electrostatic precipitator dedusting
3/ hour, temperature is that 130～220 ℃, diameter are 1.6～2.2m, length is second revolution drying kiln of 18～28m, carries out second section mummification, removes 15～25% of total water content.Through after the above-mentioned two-section type mummification, dry the mud that rotary kiln comes out from second, be a shape, particle diameter is 0.5～8mm, water ratio has been reduced to 15～30%, by vibratory screening apparatus, with particle diameter less than 2mm and particle diameter mud granule greater than 5mm, as the auxiliary fuel of outer thermal source fire coal, particle diameter is that the mud granule of 2～5mm can be used as the raw material of firing light energy saving brick and producing the cement pressed brick.
Second kind of situation is that a day processing sludge quantity is 100～200 tons (moisture percentage in sewage sludge 75～85%).With water ratio is the mud that 75～85% sewage works produce, turn in the stacking field earlier and mix evaporation 2～5 days, spontaneous evaporation fall total water content 1～5% after, pass through feed system, make mud be dispersed, favourablely so fully contact with hot blast, thereby improve the mummification efficient of mud with mud.Sent into respectively then that to provide thermal source, temperature by the fluidizing furnace fire coal be that 300～400 ℃, diameter are that 1.8～2.4m and length are the first and second oven dry rotary kilns of 20～28m, carried out first section mummification, removed 20～30% of total water content; Mud comes out from the first and second oven dry rotary kilns, pass through cooling conveyor, make mud comparatively fast heat radiation in the process that is transferred, take off part moisture content after, be admitted to the energy from being 30000～100000m through boiler flue, exhaust gas volumn after the electrostatic precipitator dedusting
3/ hour, temperature is that 130～220 ℃, diameter are that 1.8～2.4m and length are the 3rd revolution drying kiln of 20～28m, carries out second section mummification, removes 15～25% of total water content.Through after the above-mentioned two-section type mummification, dry the mud that rotary kiln comes out from the 3rd, be a shape, particle diameter is 0.5～8mm, water ratio has been reduced to 15～30%, by vibratory screening apparatus, with particle diameter less than 2mm and particle diameter mud granule greater than 5mm, as the auxiliary fuel of outer thermal source fire coal, particle diameter is that the mud granule of 2～5mm can be used as the raw material of firing light energy saving brick and producing the cement pressed brick.
Under first kind of situation, the heat supply air channels of the first and second revolution drying kilns interconnect, and air door control hot blast rate is arranged, and this on the one hand can the balanced use fume afterheat and the outer supplying heat source compound energy, raising sludge drying effect; If fume afterheat temporarily can't provide on the other hand, still can not influence the mummification work of mud.The temperature of the first revolution drying kiln is controlled by the temperature equipment that is installed between the outer supplying heat source and the first revolution drying kiln.
Under second kind of situation, the first and second revolution drying kilns interconnect with the 3rd heat supply air channel of turning round drying kiln respectively, and air door control hot blast rate arranged, this on the one hand can the balanced use fume afterheat and the outer supplying heat source compound energy, raising sludge drying effect; If fume afterheat temporarily can't provide on the other hand, still can not influence the mummification work of mud.The temperature of the first and second revolution drying kilns is controlled by the temperature equipment that is installed between the outer supplying heat source and the first and second revolution drying kilns
Example, the designed capacity of Tongxiang, Zhejiang sludge treatment factory is 200 tons in day mud of processing water ratio 75-80%, can utilize the fume afterheat resource respectively from the stack gas of three boilers, 150～200 ℃ of flue-gas temperatures, the total blast volume of three boiler smokes is 50000～80000m
3/ hour, from the mud of sewage work's water ratio 75～80%, being introduced into by the fluidizing furnace fire coal thermal source is provided, temperature is 300～400 ℃ the first oven dry rotary kiln, carries out first section mummification, removes 20～30% of total water content; Pass through cooling conveyor then, and through the cutting type pulverizer, be admitted to the energy from the stack gas waste heat, temperature is 150～200 ℃ the second oven dry rotary kiln, carries out second section mummification, removes 15～25% of total water content; Finally make the water ratio 75～80% of mud reduce to 15～30%, the processing cost of sludge drying is than the heat energy dewatered sludge that is produced by the fluidizing furnace fire coal fully, saving processing cost 20～40% per ton.Mud granule after the mummification, be respectively applied for coal-fired auxiliary fuel, fire light energy saving brick and produce the cement pressed brick, this not only makes the sludge of sewage treatment plant that must carry out landfill originally, obtained innoxious completely, in the time of minimizing and recycling treatment, make the fume afterheat resource obtain utilization, thereby opened up a cyclic utilization of waste, the effective way of the treatment of wastes with processes of wastes against one another, obtained remarkable economic efficiency, and the expense of having saved mud transportation and landfill, if in 80 yuan/ton of the comprehensive costs of mud landfill, handle 200 tons in mud every day, just save mud landfill expense the whole year and just reach more than 570 ten thousand yuan, consequent economic benefit also is fairly obvious.
Claims (3)
1. method of utilizing the energy dewatered sludge that fume afterheat combines with outer supplying heat source is characterized in that the step of method is:
1) be that the mud that 75～85% sewage works produce turns over mixed evaporation 2～5 days in the stacking field with water content, 1～5% of total water content is fallen in spontaneous evaporation;
2) will to mix evaporation back water content be 70～80% sludge of sewage treatment plant through turning over, by feed system, make it be dispersed, be admitted to by the fluidizing furnace fire coal outer thermal source is provided, temperature is 300～400 ℃ the first oven dry rotary kiln, carries out first section mummification, removes 20～35% of total water content;
3) above-mentioned mud goes out the first oven dry rotary kiln, by cooling conveyor, and through the cutting type pulverizer, is admitted to the energy from the stack gas waste heat, and temperature is 130～220 ℃ the second oven dry rotary kiln, carries out second section mummification, removes 15～25% of total water content;
4) through after the above-mentioned two-section type mummification, dry the mud that rotary kiln comes out from second, be a shape, particle diameter is 0.5～8mm, total water ratio has been reduced to 15～30%, by vibratory screening apparatus, with particle diameter less than 2mm and particle diameter mud granule greater than 5mm, as the auxiliary fuel of outer supplying heat source fire coal, particle diameter is the raw material that light energy saving brick and production cement pressed brick are fired in the mud granule conduct of 2～5mm.
2. a kind of method of utilizing the energy dewatered sludge that fume afterheat combines with outer supplying heat source according to claim 1 is characterized in that: first revolution drying kiln diameter described step 2) is 1.8～2.4m, and length is 20～28m.
3. a kind of method of utilizing the energy dewatered sludge that fume afterheat combines with outer supplying heat source according to claim 1 is characterized in that: second revolution drying kiln diameter in the described step 3) is 1.6～2.2m, and length is 18～28m.
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| CNB2006100495264A CN100364906C (en) | 2006-02-17 | 2006-02-17 | Method for drying sludge using combined flume residual heat and supplied heat |
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| CN100364906C true CN100364906C (en) | 2008-01-30 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643306B (en) * | 2009-08-25 | 2011-06-22 | 浙江大学 | Method for utilizing rotary kiln radiation of cement plant to heat-dry sludge and to prepare cement by firing sludge |
| CN101671105B (en) * | 2009-09-07 | 2011-05-18 | 浙江大学 | System for drying sludge by utilizing radiation heat of rotary cement kiln |
| CN101654324B (en) * | 2009-09-12 | 2011-12-07 | 林斌炎 | Method and device for drying sludge by utilizing heat radiation of kiln |
| 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 |
| CN111960643A (en) * | 2020-09-25 | 2020-11-20 | 宁波亿星新型材料科技有限公司 | Sludge drying system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654378A (en) * | 2005-01-21 | 2005-08-17 | 浙江大学 | Method for drying sludge by residual heat from boiler fume |
| CN1686878A (en) * | 2005-04-04 | 2005-10-26 | 浙江大学 | Anhydration system for sludge by using remaining heat of flue gas from steam power plant |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654378A (en) * | 2005-01-21 | 2005-08-17 | 浙江大学 | Method for drying sludge by residual heat from boiler fume |
| CN1686878A (en) * | 2005-04-04 | 2005-10-26 | 浙江大学 | Anhydration system for sludge by using remaining heat of flue gas from steam power plant |
Non-Patent Citations (1)
| Title |
|---|
| 几种国外城市污水处理厂污泥干化技术及设备介绍. 郭淑琴.给水排水，第30卷第6期. 2004 * |
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