CN101265009A - Clean energy-saving sludge drying method for reclaiming and utilizing tail gas residual heat - Google Patents
Clean energy-saving sludge drying method for reclaiming and utilizing tail gas residual heat Download PDFInfo
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- CN101265009A CN101265009A CNA2008100603728A CN200810060372A CN101265009A CN 101265009 A CN101265009 A CN 101265009A CN A2008100603728 A CNA2008100603728 A CN A2008100603728A CN 200810060372 A CN200810060372 A CN 200810060372A CN 101265009 A CN101265009 A CN 101265009A
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- 239000010802 sludge Substances 0.000 title claims abstract description 119
- 238000001035 drying Methods 0.000 title claims abstract description 106
- 239000011449 brick Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000008187 granular material Substances 0.000 claims description 89
- 239000007789 gas Substances 0.000 claims description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 239000002245 particle Substances 0.000 claims description 42
- 239000002918 waste heat Substances 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 18
- 239000002689 soil Substances 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000002203 pretreatment Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 230000002269 spontaneous effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001354 calcination Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011899 heat drying method Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Abstract
The invention discloses a clean and energy-saving sludge drying method with tail gas residual heat recovery. The method utilizes heat-exchange technology to recover residual heat from tail gas in sludge drying process by using a one-section method and series or parallel dual-section manner, and reuses the recovered heat to sludge drying, so as to make full use of heat energy for sludge drying, thus implementing sludge drying and granulating processes with minimal energy consumption and high efficiency, thereby remarkably improving tail gas treatment effect, and achieving energy-saving, clean and low operating cost purposes of sludge drying. The inventive method dries sludge and at the same time forms aggregates, which meets the requirements of lightweight energy-saving bricks calcination and cement compacted products production and retains over 90% original heat of the sludge, thereby resulting in maximal utilization of sludge as auxiliary coal burning fuel.
Description
Technical field
The present invention relates to the clean energy-saving sludge drying method that a kind of using waste heat from tail gas is recycled.
Background technology
The municipal sewage plant is handling trade effluent and the produced simultaneously mud of sanitary sewage, and the dredging mud in polluted river and lake is except the inorganic component that exists with mineral forms, also contain a large amount of Persistent organic pollutants and various heavy element, this two classes mud is commonly called municipal sludge.The water ratio height of municipal sludge, quantity is big, and enrichment the pollutent of high density, if can not properly be handled or dispose, can bring serious secondary pollution to environment.How safety, economical, handle municipal sludge effectively and become a difficult problem that faces jointly both at home and abroad.
Municipal sludge is mainly taked methods such as sanitary landfill, burning, soil utilization and throwing sea abroad.Sanitary landfill needs enough spaces and necessary environment protection means, and along with the continuous quickening of urbanization process, peri-urban is difficult to find the suitable space of burying mud of piling; Though burn and to make significantly minimizing of mud, but sludge incineration facility investment volume height, energy-output ratio is big, the working cost costliness, add that mud can bring pollution to atmospheric environment when burning, according to the present situation of China, sludge incineration is handled and is difficult to economically bear, and is ripe not enough technically; The soil utilization is exactly with the mud as fertilizer sources, be used for agricultural or greening, but, the utilizability that contained heavy metal and persistence organic pollutant have limited the mud as fertilizer sources in the municipal sludge, according to studies show that, the heavy metal of enrichment can enrichment in soil in the municipal sludge, and enters food chain by the absorption of crop, finally is detrimental to health; Mud is thrown the sea can pollute offshore waters, and the marine ecosystem human foods chain of unifying is threatened, and this method is prohibited.Owing to do not have effective sludge treatment technology to be used for reference abroad, therefore, the method that present China mainly adopts interim heap to bury to municipal sludge, problem such as the secondary environmental pollution of Chan Shenging and a large amount of land occupations is sharp-pointed day by day therefrom, this has not only had a strong impact on the normal operation of municipal sewage treatment, and, come down hard upon to become the social factors of instability because of what mud heap buried a peripheral resident in partial area.
Along with improving constantly of China's rapid economy development and living standards of the people; people are more and more higher to the requirement of environmental quality; in order to preserve the ecological environment and to improve the quality of environment for human survival; various places government constantly strengthens the dynamics to environment protection; requiring all trade effluents and city domestic sewage to pass through handles; could discharge after up to standard; simultaneously in order to administer and improve the environmental quality of polluted river and water body in lake effectively; nearly all section and lake near the city needs dredging, this means that the quantity of municipal sludge will grow with each passing day.Practice shows, mud is carried out innoxious, minimizing and recycling treatment is thoroughly to dispose the unique channel of municipal sludge.
Sludge of sewage treatment plant and lake, river dredging mud have water ratio height, bulky characteristics, and heat drying not only can make mud reduce volume significantly, and can reduce negative characteristic such as stink, pathogenic bacteria, viscosity significantly, mud after the mummification has many-sided purposes especially, therefore, heat drying is one step of key that mud is realized minimizing, innoxious and recycling treatment.We are once in mud that the municipal sewage plant is produced and pollution river, on the basis of lake dredging mud physico-chemical property research, by a large amount of engineering practices, 200410052759.0) and utilize the method (patent No.: ZL 200510048978.6) of residual heat from boiler fume dewatered sludge invented return-flow type temperature controllable sludge drying apparatus and method (invention patent mandate number: in succession, this makes mud when obtaining effective mummification, form scleroid mud granule, and preserved the original calorific value more than 90%, this mud granule also can be used as coal-fired auxiliary fuel, also can fire light energy saving brick and produce cement pressing products etc., for the harmless resource utilization processing of municipal sludge is laid a good foundation, their technological core is, before city sewage sludge reclamation utilized, elder generation was with sludge drying and make granule.The process of mud heat drying, it is the process of energy net disbursement, the expense of power consumption has accounted for about 80% of whole service cost, existing mud heat drying method, be warm air to be sent in the drying installation, heat is passed to the mud material, make the moisture vaporization in the mud and obtain mummification by supplying heat source, the heat energy of some enters atmosphere with the latent heat of water vapor in the sensible heat of flue gas and the flue gas in this process, has caused the waste of the energy.In order to reduce the energy consumption of sludge drying, reduce the running cost of mud heat drying, we have invented the clean energy-saving sludge drying method of using waste heat from tail gas recycling, by adopting the latent heat in the hot swapping recovery drying sludge medium, again with the drying process of this heat energy recovery in mud, this utilization ratio that enables on the one hand is greatly improved, and the processing efficiency of the tail gas that makes sludge drying on the other hand and produced also is further improved.In addition because whole mud drying process adopts totally-enclosed operation, therefore, not only make mud obtain mummification and granulating after, still keep the original calorific value more than 90% of mud, and make sludge drying just truly show clean energy-saving.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the clean energy-saving sludge drying method that provides a kind of using waste heat from tail gas to recycle.
The clean energy-saving sludge drying method that a kind of using waste heat from tail gas is recycled comprises the steps:
1) be that 75～85% municipal sludges are sent into closed mud pre-treatment storehouse with total water content, stacking through 2-5 days, make the mud spontaneous evaporation fall the moisture of total water content 2～5%, and the gas that discharges is sent into biological soil filter bed purification back discharging, or send into heating stove high temperature and eliminate with induced draft fan;
2) will be through pretreated mud, by charger and helical feed, be admitted to temperature and be 300～450 ℃ sludge drying granulating apparatus, carry out sludge drying, remove the moisture of mud total water content 30～35%;
3) after above-mentioned mud goes out the sludge drying granulating apparatus, the water content of mud reduces to 40～55%, and the formation particle diameter is the mud granule of 1～10mm, pass through handling equipment, this mud granule is entered the first mud stockyard, when the mud granule of stacking when the first mud stockyard reaches storehouse volume 30～40%, enter the second mud stockyard;
4) from the hot gas of heating stove, pass through temperature equipment, hot air temperature is controlled at 300～450 ℃, this hot gas enters the sludge drying granulating apparatus, mud is carried out mummification, from sludge drying granulating apparatus tail gas discharged temperature is 120～200 ℃, this tail gas enters hot tube heat exchanger, by waste heat recovery, air part after the preheating is sent into the first or second mud stockyard, and another part is sent the sludge drying granulating apparatus back to, from the hot tube heat exchanger tail gas discharged, enter the dedusting air-removal equipment, qualified discharge;
5) the mud granule of the first mud stockyard, under from the hot tube heat exchanger preheated air, further dehydration, when water content reduces to 15～30%, preheated air stops the first mud stockyard is supplied gas, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter be the mud granule of 2～5mm as firing light energy saving brick and produce the raw material of cement pressing products, it is 40～55% mud granule that the first mud stockyard that empties is accepted again from sludge drying granulating apparatus water content;
6) stop the first mud stockyard supplied gas from the preheated air of hot tube heat exchanger after, send into the second mud stockyard, be that the second mud stockyard mud granule further dewaters, warm air is provided, when the mud granule water content of the second mud stockyard reduces to 15～30%, preheated air stops the second mud stockyard is supplied gas, send into the first mud stockyard again, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as 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 cement pressing products, and it is 40～55% mud granule that the second mud stockyard that empties is accepted again from sludge drying granulating apparatus water content.
Described sludge drying granulating apparatus is revolution mummification kiln, and the diameter of revolution mummification kiln is 2.0～2.6m, and length is 25.0～35.0m.
From the gas of first and second mud stockyards discharging, send into the biological soil filter bed and purify the back discharging.The top in mud pre-treatment storehouse is for adopting positive plate.
The clean energy-saving sludge drying method that another kind of using waste heat from tail gas is recycled comprises the steps:
1) be that 75～85% municipal sludges are sent into closed mud pre-treatment storehouse with total water content, stacking through 2-5 days, make the mud spontaneous evaporation fall the moisture of total water content 2～5%, and the gas that discharges is sent into biological soil filter bed purification back discharging, or send into heating stove high temperature and eliminate with induced draft fan;
2) will be through pretreated mud, by charger and helical feed, be admitted to temperature and be 300～400 ℃ the first sludge drying granulating apparatus, carry out first section mummification, remove the moisture of mud total water content 25～30%;
3) above-mentioned mud goes out the first sludge drying granulating apparatus, by helical feed, is admitted to temperature and is 200～300 ℃ the second sludge drying granulating apparatus, carries out second section mummification, removes the moisture of mud total water content 20～25%;
4) after above-mentioned mud goes out the second sludge drying granulating apparatus, the water content of mud reduces to 35～40%, and the formation particle diameter is the mud granule of 1～10mm, pass through handling equipment, this mud granule is entered the first mud stockyard, when the mud granule of stacking when the first mud stockyard reaches storehouse volume 30～40%, enter the second mud stockyard;
5) from the hot gas of heating stove, pass through temperature equipment, hot air temperature is controlled at 200～400 ℃, wherein the hot gas of 2.5/5～3/5 total amount enters the first sludge drying granulating apparatus, 2.5/5 the hot gas of～2/5 total amount enters the second sludge drying granulating apparatus in parallel or placed in-line with the first sludge drying granulating apparatus, from the first and second sludge drying granulating apparatus tail gas discharged temperature is 100～180 ℃, this tail gas enters hot tube heat exchanger, by waste heat recovery, air part after the preheating is sent into the first or second mud stockyard, another part is sent the second sludge drying granulating apparatus back to, from the hot tube heat exchanger tail gas discharged, enter the dedusting air-removal equipment, qualified discharge;
6) the mud granule of the first mud stockyard, under from the hot tube heat exchanger preheated air, further dehydration, when water content reduces to 15～25%, preheated air stops the first mud stockyard is supplied gas, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter be the mud granule of 2～5mm as firing light energy saving brick and produce the raw material of cement pressing products, it is 35～40% mud granule that the first mud stockyard that empties is accepted again from the second sludge drying granulating apparatus water content;
7) stop the first mud stockyard supplied gas from the preheated air of hot tube heat exchanger after, send into the second mud stockyard, be that the second mud stockyard mud granule further dewaters, warm air is provided, when the mud granule water content of the second mud stockyard reduces to 15～25%, preheated air stops the second mud stockyard is supplied gas, send into the first mud stockyard again, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter is the raw material that light energy saving brick and production cement pressing products are fired in the mud granule conduct of 2～5mm, and the new water content of the first mud stockyard that empties acceptance is 35～40% mud granule.
The described first sludge drying granulating apparatus is revolution mummification kiln, and revolution mummification kiln diameter is 2.0～2.6m, and length is 22.0～28.0m, and the second sludge drying granulating apparatus is revolution mummification kiln, and for revolution mummification kiln diameter is 1.8～2.4m, length is 20～26m
From the gas of first and second mud stockyards discharging, send into the biological soil filter bed and purify the back discharging.The top in mud pre-treatment storehouse is for adopting positive plate.
The present invention is come into operation in Jiangsu, practice shows that this technology is by the using waste heat from tail gas recycling, and not only making provides the energy of dewatered sludge to be utilized fully, and sludge drying discharge tail gas temperature is descended, thereby improved the effect of dedusting degasification greatly.Therefore, on the one hand sludge drying is carried out under lower running cost, make mud obtain effective mummification on the other hand, mud is formed naturally meet the granule of firing light energy saving brick and producing the requirement of cement pressing products hardness, and kept the original calorific value more than 90% of mud, and make the recycling value of mud granule reach maximization, really realized clean energy-saving, when obtaining significantly social and environmental benefit, also obtained tangible economic benefit.
Description of drawings
Fig. 1 is the clean energy-saving sludge drying method schema that the one-part form using waste heat from tail gas is recycled.
Fig. 2 is the clean energy-saving sludge drying method schema that serial or parallel connection two-section type using waste heat from tail gas is recycled.
Embodiment
The present invention utilizes hot swapping, mode by the using waste heat from tail gas recycling, make full use of the heat energy that dewatered sludge is provided, finish sludge drying and granulating process, finally realize the purpose of energy-conservation, cleaner production and reduction running cost with minimum energy consumption.The clean energy-saving sludge drying system that one-part form that the present invention proposes and serial or parallel connection two-section type using waste heat from tail gas are recycled forms by following main device: closed mud pre-treatment storehouse, heating stove, temperature equipment, sludge drying granulating apparatus, handling equipment, hot tube heat exchanger, dedusting degasifying device and biological soil filter bed.
The clean energy-saving sludge drying method that the one-part form using waste heat from tail gas is recycled comprises the steps:
1) be that 75～85% municipal sludges are sent into closed mud pre-treatment storehouse with total water content, stacking through 2-5 days, make the mud spontaneous evaporation fall the moisture of total water content 2～5%, and the gas that discharges is sent into biological soil filter bed purification back discharging, or send into heating stove high temperature and eliminate with induced draft fan;
2) will be through pretreated mud, by charger and helical feed, be admitted to temperature and be 300～450 ℃ sludge drying granulating apparatus, carry out sludge drying, remove the moisture of mud total water content 30～35%;
3) after above-mentioned mud goes out the sludge drying granulating apparatus, the water content of mud reduces to 40～55%, and the formation particle diameter is the mud granule of 1～10mm, pass through handling equipment, this mud granule is entered the first mud stockyard, when the mud granule of stacking when the first mud stockyard reaches storehouse volume 30～40%, enter the second mud stockyard;
4) from the hot gas of heating stove, pass through temperature equipment, make hot air temperature be controlled at 300～450 ℃, this hot gas enters the sludge drying granulating apparatus, mud is carried out mummification, from sludge drying granulating apparatus tail gas discharged temperature is 120～200 ℃, this tail gas enters hot tube heat exchanger, by waste heat recovery, air part after the preheating is sent into the first or second mud stockyard, and another part is sent the sludge drying granulating apparatus back to, from the hot tube heat exchanger tail gas discharged, enter the dedusting air-removal equipment, qualified discharge;
5) the mud granule of the first mud stockyard, under from the hot tube heat exchanger preheated air, further dehydration, when water content reduces to 15～30%, preheated air stops the first mud stockyard is supplied gas, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter be the mud granule of 2～5mm as firing light energy saving brick and produce the raw material of cement pressing products, it is 40～55% mud granule that the first mud stockyard that empties is accepted again from sludge drying granulating apparatus water content;
6) stop the first mud stockyard supplied gas from the preheated air of hot tube heat exchanger after, send into the second mud stockyard, be that the second mud stockyard mud granule further dewaters, warm air is provided, when the mud granule water content of the second mud stockyard reduces to 15～30%, preheated air stops the second mud stockyard is supplied gas, send into the first mud stockyard again, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as 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 cement pressing products, and it is 40～55% mud granule that the second mud stockyard that empties is accepted again from sludge drying granulating apparatus water content.
Described sludge drying granulating apparatus is revolution mummification kiln, and the diameter of revolution mummification kiln is 2.0～2.6m, and length is 25.0～35.0m.
From the gas of first and second mud stockyards discharging, send into the biological soil filter bed and purify the back discharging.The top in mud pre-treatment storehouse is for adopting positive plate.
The clean energy-saving sludge drying method that serial or parallel connection two-section type using waste heat from tail gas is recycled comprises the steps:
1) be that 75～85% municipal sludges are sent into closed mud pre-treatment storehouse with total water content, stacking through 2-5 days, make the mud spontaneous evaporation fall the moisture of total water content 2～5%, and the gas that discharges is sent into biological soil filter bed purification back discharging, or send into heating stove high temperature and eliminate with induced draft fan;
2) will be through pretreated mud, by charger and helical feed, be admitted to temperature and be 300～400 ℃ the first sludge drying granulating apparatus, carry out first section mummification, remove the moisture of mud total water content 25～30%;
3) above-mentioned mud goes out the first sludge drying granulating apparatus, by helical feed, is admitted to temperature and is 200～300 ℃ the second sludge drying granulating apparatus, carries out second section mummification, removes the moisture of mud total water content 20～25%;
4) after above-mentioned mud goes out the second sludge drying granulating apparatus, the water content of mud reduces to 35～40%, and the formation particle diameter is the mud granule of 1～00mm, pass through handling equipment, this mud granule is entered the first mud stockyard, when the mud granule of stacking when the first mud stockyard reaches storehouse volume 30～40%, enter the second mud stockyard;
5) from the hot gas of heating stove, pass through temperature equipment, make hot air temperature be controlled at 200～400 ℃, wherein the hot gas of 2.5/5～3/5 total amount enters the first sludge drying granulating apparatus, 2.5/5 the hot gas of～2/5 total amount enters the second sludge drying granulating apparatus in parallel or placed in-line with the first sludge drying granulating apparatus, from the first and second sludge drying granulating apparatus tail gas discharged temperature is 100～200 ℃, this tail gas enters hot tube heat exchanger, by waste heat recovery, air part after the preheating is sent into the first or second mud stockyard, another part is sent the first and second sludge drying granulating apparatus back to, from the hot tube heat exchanger tail gas discharged, enter the dedusting air-removal equipment, qualified discharge;
6) the mud granule of the first mud stockyard, under from the hot tube heat exchanger preheated air, further dehydration, when water content reduces to 15～25%, preheated air stops the first mud stockyard is supplied gas, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter be the mud granule of 2～5mm as firing light energy saving brick and produce the raw material of cement pressing products, it is 35～40% mud granule that the first mud stockyard that empties is accepted again from the second sludge drying granulating apparatus water content;
7) stop the first mud stockyard supplied gas from the preheated air of hot tube heat exchanger after, send into the second mud stockyard, be that the second mud stockyard mud granule further dewaters, warm air is provided, when the mud granule water content of the second mud stockyard reduces to 15～25%, preheated air stops the second mud stockyard is supplied gas, send into the first mud stockyard again, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter is the raw material that light energy saving brick and production cement pressing products are fired in the mud granule conduct of 2～5mm, and the new water content of the first mud stockyard that empties acceptance is 35～40% mud granule.
The described first sludge drying granulating apparatus is revolution mummification kiln, and revolution mummification kiln diameter is 2.0～2.6m, and length is 22.0～28.0m, and the second sludge drying granulating apparatus is revolution mummification kiln, and for revolution mummification kiln diameter is 1.8～2.4m, length is 20～26m
From the gas of first and second mud stockyards discharging, send into the biological soil filter bed and purify the back discharging.The top in mud pre-treatment storehouse is for adopting positive plate.
Claims (8)
1. the clean energy-saving sludge drying method that using waste heat from tail gas is recycled is characterized in that comprising the steps:
1) be that 75～85% municipal sludges are sent into closed mud pre-treatment storehouse with total water content, stacking through 2-5 days, make the mud spontaneous evaporation fall the moisture of total water content 2～5%, and the gas that discharges is sent into biological soil filter bed purification back discharging, or send into heating stove high temperature and eliminate with induced draft fan;
2) will be through pretreated mud, by charger and helical feed, be admitted to temperature and be 300～450 ℃ sludge drying granulating apparatus, carry out sludge drying, remove the moisture of mud total water content 30～35%;
3) after above-mentioned mud goes out the sludge drying granulating apparatus, the water content of mud reduces to 40～55%, and the formation particle diameter is the mud granule of 1～10mm, pass through handling equipment, this mud granule is sent into the first mud stockyard, when the mud granule of stacking when the first mud stockyard reaches storehouse volume 30～40%, send into the second mud stockyard;
4) from the hot gas of heating stove, pass through temperature equipment, hot air temperature is controlled at 300～450 ℃, this hot gas enters the sludge drying granulating apparatus, mud is carried out mummification, from sludge drying granulating apparatus tail gas discharged temperature is 120～200 ℃, this tail gas enters hot tube heat exchanger, by waste heat recovery, air part after the preheating is sent into the first or second mud stockyard, and another part is sent the sludge drying granulating apparatus back to, from the hot tube heat exchanger tail gas discharged, enter the dedusting air-removal equipment, qualified discharge;
5) the mud granule of the first mud stockyard, under from the hot tube heat exchanger preheated air, further dehydration, when water content reduces to 20～30%, preheated air stops the first mud stockyard is supplied gas, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter be the mud granule of 2～5mm as firing light energy saving brick and produce the raw material of cement pressing products, it is 40～55% mud granule that the first mud stockyard that empties is accepted again from sludge drying granulating apparatus water content;
6) stop the first mud stockyard supplied gas from the preheated air of hot tube heat exchanger after, send into the second mud stockyard, be that the second mud stockyard mud granule further dewaters, warm air is provided, when the mud granule water content of the second mud stockyard reduces to 15～30%, preheated air stops the second mud stockyard is supplied gas, send into the first mud stockyard again, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as 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 cement pressing products, and it is 40～55% mud granule that the second mud stockyard that empties is accepted again from sludge drying granulating apparatus water content.
2. the clean energy-saving sludge drying method that a kind of using waste heat from tail gas according to claim 1 is recycled is characterized in that described sludge drying granulating apparatus is revolution mummification kiln, and the diameter of revolution mummification kiln is 2.0～2.6m, and length is 25.0～35.0m.
3. the clean energy-saving sludge drying method that a kind of using waste heat from tail gas according to claim 1 is recycled is characterized in that described gas from the discharging of the first and second mud stockyards, sends into the biological soil filter bed and purifies the back discharging.
4. the clean energy-saving sludge drying method that a kind of using waste heat from tail gas according to claim 1 is recycled, the top that it is characterized in that described mud pre-treatment storehouse is for adopting positive plate.
5. the clean energy-saving sludge drying method that using waste heat from tail gas is recycled is characterized in that comprising the steps:
1) be that 75～85% municipal sludges are sent into closed mud pre-treatment storehouse with total water content, stacking through 2-5 days, make the mud spontaneous evaporation fall the moisture of total water content 2～5%, and the gas that discharges is sent into biological soil filter bed purification back discharging, or send into heating stove high temperature and eliminate with induced draft fan;
2) will be through pretreated mud, by charger and helical feed, be admitted to temperature and be 300～400 ℃ the first sludge drying granulating apparatus, carry out first section mummification, remove the moisture of mud total water content 25～30%;
3) above-mentioned mud goes out the first sludge drying granulating apparatus, by helical feed, is admitted to temperature and is 200～300 ℃ the second sludge drying granulating apparatus, carries out second section mummification, removes the moisture of mud total water content 20～25%;
4) after above-mentioned mud goes out the second sludge drying granulating apparatus, the water content of mud reduces to 35～40%, and the formation particle diameter is the mud granule of 1～10mm, pass through handling equipment, this mud granule is entered the first mud stockyard, when the mud granule of stacking when the first mud stockyard reaches storehouse volume 30～40%, enter the second mud stockyard;
5) from the hot gas of heating stove, pass through temperature equipment, hot air temperature is controlled at 200～400 ℃, wherein the hot gas of 2.5/5～3/5 total amount enters the first sludge drying granulating apparatus, 2.5/5 the hot gas of～2/5 total amount enters the second sludge drying granulating apparatus in parallel or placed in-line with the first sludge drying granulating apparatus, from the first and second sludge drying granulating apparatus tail gas discharged temperature is 100～180 ℃, this tail gas enters hot tube heat exchanger, by waste heat recovery, air part after the preheating is sent into the first or second mud stockyard, another part is sent the second sludge drying granulating apparatus back to, from the hot tube heat exchanger tail gas discharged, enter the dedusting air-removal equipment, qualified discharge;
6) the mud granule of the first mud stockyard, under from the hot tube heat exchanger preheated air, further dehydration, when water content reduces to 15～25%, preheated air stops the first mud stockyard is supplied gas, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter be the mud granule of 2～5mm as firing light energy saving brick and produce the raw material of cement pressing products, it is 35～40% mud granule that the first mud stockyard that empties is accepted again from the second sludge drying granulating apparatus water content;
7) stop the first mud stockyard supplied gas from the preheated air of hot tube heat exchanger after, send into the second mud stockyard, be that the second mud stockyard mud granule further dewaters, warm air is provided, when the mud granule water content of the second mud stockyard reduces to 15～25%, preheated air stops the second mud stockyard is supplied gas, send into the first mud stockyard again, this mud granule is by dividing sieve apparatus, with particle diameter less than 2mm and particle diameter greater than the mud granule of 5mm auxiliary fuel as fire coal, particle diameter is the raw material that light energy saving brick and production cement pressing products are fired in the mud granule conduct of 2～5mm, and the new water content of the first mud stockyard that empties acceptance is 35～40% mud granule.
6. the clean energy-saving sludge drying method that a kind of using waste heat from tail gas according to claim 5 is recycled, it is characterized in that the described first sludge drying granulating apparatus is revolution mummification kiln, revolution mummification kiln diameter is 2.0～2.6m, length is 22.0～28.0m, the second sludge drying granulating apparatus is revolution mummification kiln, revolution mummification kiln diameter is 1.8～2.4m, and length is 20～26m.
7. the clean energy-saving sludge drying method that a kind of using waste heat from tail gas according to claim 5 is recycled is characterized in that described gas from the discharging of the first and second mud stockyards, sends into the biological soil filter bed and purifies the back discharging.
8. the clean energy-saving sludge drying method that a kind of using waste heat from tail gas according to claim 5 is recycled, the top that it is characterized in that described mud pre-treatment storehouse is for adopting positive plate.
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| CN102001809A (en) * | 2010-12-07 | 2011-04-06 | 北京机电院高技术股份有限公司 | Belt-type drying complete processing device and method for sludge |
| CN101643307B (en) * | 2009-08-25 | 2011-08-31 | 浙江大学 | Method for utilizing fume afterheat of cement plant to heat-dry sludge and prepare cement by firing sludge |
| CN102435082A (en) * | 2011-10-28 | 2012-05-02 | 北京建筑材料科学研究总院有限公司 | Two-phase heat exchanger and system utilizing cement kiln waste heat to dry sludge |
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