CN201186893Y - Heat pump and sludge dewatering integrated system - Google Patents

Heat pump and sludge dewatering integrated system Download PDF

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Publication number
CN201186893Y
CN201186893Y CNU2008200793802U CN200820079380U CN201186893Y CN 201186893 Y CN201186893 Y CN 201186893Y CN U2008200793802 U CNU2008200793802 U CN U2008200793802U CN 200820079380 U CN200820079380 U CN 200820079380U CN 201186893 Y CN201186893 Y CN 201186893Y
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China
Prior art keywords
heat
heat pump
sludge
mud
energy
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CNU2008200793802U
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Chinese (zh)
Inventor
吴静
史琳
施汉昌
韩丽
昝成
田磊
周红明
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Tsinghua University
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Tsinghua University
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Abstract

The utility model provides a system integrating heat pumping with sludge drying, and belongs to the technical field of energy conservation and consumption reduction in a sewage treatment plant. The system comprises a sewage advanced treatment device, a water source heat pump, a dehumidifying heat pipe, a granulating device and a dehydrator. The water source heat pump is employed to reclaim the heat energy of the water outlet in the municipal sewage plant, and meanwhile, the dehumidifying heat pipe is employed for absorbing latent heat and gasification latent heat of wet air during a sludge drying process to be used as heat sources for preheating the sludge drying together. The sludge has final water content of 20-25% by adopting a dry matter back mixing system, a dewatered sludge two stage drying technology, and a continuous drying manner of continuous feeding and discharging, and can be used as a high quality fertilizer and a solid fuel. The system realizes the comprehensive utilization of water, heat and energy in the sewage treatment plant, and reduces the integral energy consumption of the sewage treatment plant by more than 20%.

Description

Heat pump and sludge drying integrated system
Technical field
The utility model belongs to the energy-saving and cost-reducing technical field of sewage work, and the hydro-thermal that relates to the combination of a kind of sewage effluents heat recovery and sludge drying can utilization system.This system utilizes the heat energy of heat pump recovery effluent of municipal sewage plant, as the thermal source of sludge drying.
Background technology
Along with the progressively raising of quickening of urbanization process and environmental protection requirement, municipal sewage plant's quantity increases day by day.At present, all adopt activated sludge process above 90% municipal sewage treatment in the world, because the excess sludge generation generally is 0.3%~0.5% (in a water ratio 97%) of sewage load, the moisture percentage in sewage sludge height, the organic content height, the character instability is easily degenerated smelly, and contain hazardous and noxious substances such as pathogenic bacteria, parasitic ovum, heavy metal, make the minimizing of mud and resource utilization become the major issue in the sewage disposal.The sludge treatment investment accounts for 20%~50% of sewage work's gross investment.Municipal sludge treatment and disposal working cost is high to have become an important factor that limits its development, and the sludge treatment disposal technology of greatly developing cheap low consumption has become the task of top priority.
Generally, the mechanical dehydration technology can only be reduced to the water ratio of mud about 80%, and so high water ratio is unfavorable for the subsequent transportation and the disposal of mud, therefore, mud is effectively addressed and recycling, and the sludge drying link is indispensable.Sludge drying is the key measure of sludge reduction, can make mud significantly subtract appearance, and proterties is improved greatly, product odorless, pathogen-free domestic and serve many purposes, as make fertilizer, soil improvement agent, substitute energy etc.At present, sludge drying comprises direct mummification and indirectly drying.Directly warm air or useless flue gas are adopted in mummification usually, thermo-efficiency low (about 30%) not only, and produce a large amount of tail gas, odor concentration height in the tail gas must carry out deodorization and handle.And indirectly drying easily produces the glued wall sticking phenomenon of mud.Sludge drying will consume a large amount of heat energy, causes the with high costs of sludge treatment.
Compose in the city domestic sewage and depositing a large amount of Lowlevel thermal energies, for example with 100,000 m 3Secondary effluent from sewage treatment plant reduces by 3 ℃, can obtain the heat of about 2.8 hundred million kcal.Simultaneously the sewage water yield is stable, compares with envrionment temperature, shows as cool in summer and warm in winterly, and the water temperature rangeability is little, is stable thermal source.Novel heat pump fluid can be stablized the hot water of about 80 ℃ of generations, and can guarantee the quite high coefficient of performance.
The development of sludge drying technique and heat pump techniques provides the technology possibility for realizing sewage work based on the sludge reduction of energy-optimised configuration, can excavate the energy-saving potential of sewage work simultaneously.
The utility model content
The purpose of this utility model is at the mud decrement of municipal sewage plant and energy-saving and cost-reducing problem, a kind of heat pump and sludge drying integrated system are provided, promptly utilize heat pump techniques with the sewage effluents waste heat recovery, the hydro-thermal that is used for sludge drying can fully utilize, and make up a cover based on the sludge drying system based on energy-optimised configuration of heat pump set and sludge drying equipment, realize the system capacity balance, reach dewatered sludge, reduce cost, recycle the purpose of the energy.
The technical solution of the utility model is as follows: a kind of heat pump and sludge drying integrated system, it is characterized in that: this system comprises advanced treatment of wastewater equipment, water resource heat pump, dryer, dehumidifying heat pump and granulating equipment, the vaporizer heat transferring medium side of water resource heat pump is connected with the rising pipe of advanced treatment of wastewater equipment, the condenser heat transferring medium side of water resource heat pump links to each other with the drier chamber by airduct, described dehumidifying heat pump is put into the exit duct of dryer, after damp-heat air extracted the vaporizer and condenser of the heat pump of process dehumidifying successively by blower fan, it was indoor to turn back to drier by pipeline again.
The utlity model has following advantage and beneficial effect: 1. sludge drying technique and heat pump techniques are combined, bring into play the advantage of the two, utilize a large amount of used heat in the water resource heat pump recovery city domestic sewage factory secondary effluent, promote energy grade, there is the dehumidifying heat pump to absorb the sensible heat and the gasification latent heat of damp-heat air simultaneously, jointly as the thermal source of sludge drying preheating, energy obtains fully and reasonable use, the new integrated technology that formed sewage work's internal water, heat, can fully utilize.2. save energy.The coefficient of performance of heat pump (COP) reaches 3.0~4.0, and promptly the heat that provides of heat pump is 3~4 times of the heat that produces with electrically heated under the power.So compare with electric boiler, can save the electric energy more than 2/3, save 1/2 the energy than fuel boiler.The thermal source of heat pump is from sewage effluents, and after the employing present technique, the whole energy consumption of Sewage Plant reduces more than 20%; 3. two-part of Cai Yonging and continuous drying mode, the sludge drying cycle is shorter, and is bigger in batches, and the tiny and granularity of material is than homogeneous after the moulding, and dry mass is stable, the organic composition in the finished product that can keep dry simultaneously; 4. do not produce secondary pollution.The heat pump dewatered sludge carries out in closed cycle system, and the dust that produces in drying process and the obnoxious flavour of fugitive constituent can be accomplished not leak, and can reduce to minimum pollution to surrounding environment.
Description of drawings
Fig. 1 is the structural principle and the process flow sheet of heat pump and sludge drying integrated system.
Fig. 2 is the fundamental diagram of water resource heat pump.
Fig. 3 absorbs the sensible heat of damp-heat air in the mud drying course and the structural principle synoptic diagram that gasification latent heat is recycled and reused for sludge drying again for the dehumidifying heat pump.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is described further:
A kind of heat pump that the utility model provides and sludge drying integrated system are as shown in Figure 1, the secondary effluent that the sewage that comes out from sewage work obtains through advanced treatment, utilize water resource heat pump to reclaim the heat energy of secondary effluent, form hot blast and enter dryer, as the thermal source of sludge drying; The mud that sewage work comes out is sent into drier after mechanical dehydration is handled indoor, and the hot blast that provides through water resource heat pump heats; Adopting mud back-mixing technology, the mud behind the mechanical dehydration is sent into tablets press with part from the mud that dryer comes out, is 60~65% mud through being mixed and made into water ratio, enters dryer then.Utilize the dehumidifying heat pump to absorb the sensible heat and the gasification latent heat of damp-heat air in the mud drying course, synergy through water resource heat pump and dehumidifying heat pump, utilizing the hot blast that comes out from water resource heat pump and dehumidifying heat pump respectively that dewatered sludge is carried out the two-part oven dry handles, and the continuous drying mode of employing continuously feeding and discharging, the mud of final dryer output water ratio 20~25%, can be used as fertilizer and be used for greening and farmland replacement chemical fertilizer, also can be used as solid fuel.
In order to be easy to mummification, mud is poured on the stainless transmission guipure, travelling belt is pressed the setting speed running, transports the granulated fertilizer that makes mud form water ratio 20~25% back and forth through several layers of travelling belt and sends dryer.
Fig. 2 is the fundamental diagram of water resource heat pump.The working medium of moving in the heat pump, the heat of absorption secondary effluent flashes to low-pressure steam from low-pressure liquid working medium in vaporizer, and compressed machine supercharging becomes the steam of High Temperature High Pressure; In condenser, the working substance steam of High Temperature High Pressure is emitted the air that the heat heating enters the drier chamber, and itself then becomes highly pressurised liquid from condensation of gas working medium; By throttling set, liquid working substance produces blocking effect, has reduced pressure and temperature, becomes low pressure, low temperature liquid, enters the heat that absorbs secondary effluent in the vaporizer once again, forms heat pump cycle; Water outlet after heat pump reclaims heat is disposed to water body or reuse.
A dryer hot blast part is from water resource heat pump, to the vertical air-supply of transmission guipure of containing dirt-carrying mud, other has the dehumidifying heat pump to absorb the sensible heat and the gasification latent heat of damp-heat air in the mud drying course, reclaim heat and supply with dryer, as shown in Figure 3, the dehumidifying heat pump is put into the exit duct of dryer, after the damp-heat air that produces in the mud drying course is extracted by blower fan through the vaporizer of dehumidifying heat pump, the low-pressure liquid working medium draw heat that is moved in the system, make wet air cooling dehydration, become unsaturated air, this low temperature unsaturated air is heated by the working substance steam of High Temperature High Pressure when condenser then, form warm air and sent back to the drier chamber again, form the dehumidifying heat pump cycle by pipeline.
The utility model can be used for the minimizing that the municipal sewage plant generates mud, realize simultaneously water, heat, can distribute rationally.Can also be used for other sewage work except that municipal wastewater treatment plant.
Embodiment 1
A scale is 10, the sewage work of 000t/d, the about 7.2m of mud of generation water ratio 80% 3, the secondary effluent water temperature is about 18 ℃, oven dry mud institute heat requirement is 1.88 * 10 7KJ, the heat that heat pump can extract from secondary effluent are 14 * 10 7KJ (supposing that water temperature reduces by 5 ℃), there is the dehumidifying heat pump to absorb the sensible heat and the gasification latent heat of damp-heat air in the mud drying course simultaneously, reclaim heat and supply with dryer, the dryer operations temperature can be 50~85 ℃ of adjustings, and the effciency of energy transfer of supposing heat pump mud is 80%.By above data as seen, water resource heat pump and dehumidifying heat pump can be supplied with the heat of dryer, are far longer than the heat of mud baking needed.
Existing data shows, municipal sewage plant's power consumption accounts for 60%~90% of total energy consumption, the sludge treatment power consumption accounts for 10%~25% of total power consumption, as seen the processing of mud investment is very big, so adopt the integrated technology of heat pump and sludge drying, can realize sewage work's water, heat, can distribute rationally, realize that simultaneously sewage work inside is significantly energy-saving and cost-reducing.

Claims (1)

1. heat pump and sludge drying integrated system, it is characterized in that: this system comprises advanced treatment of wastewater equipment, water resource heat pump, the dehumidifying heat pump, granulating equipment and dryer, mud after the granulation enters the kiln of dryer through pipeline, and the kiln of this dryer is connected with the import of mud granulizing equipment by mud back-mixing pipeline; The vaporizer heat transferring medium side of water resource heat pump is connected with the rising pipe of advanced treatment of wastewater equipment, and the condenser heat transferring medium side of water resource heat pump links to each other with the drier chamber by airduct; Described dehumidifying heat pump is put into the exit duct of dryer, and after damp-heat air extracted the vaporizer and condenser of the heat pump of process dehumidifying successively by blower fan, it was indoor to turn back to drier by pipeline again.
CNU2008200793802U 2008-03-14 2008-03-14 Heat pump and sludge dewatering integrated system Expired - Lifetime CN201186893Y (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101239773B (en) * 2008-03-14 2010-06-09 清华大学 Heat pump and sludge drying integration method and system
CN101492233B (en) * 2009-02-26 2010-12-08 大连理工大学 Drying plant for high-moisture percentage plaster pasty materials
CN102515462A (en) * 2012-01-11 2012-06-27 北京龙电宏泰环保科技有限公司 Energy-saving system applied to sludge treatment and disposal
CN103189582A (en) * 2010-05-20 2013-07-03 艾森索水业有限责任公司 Method and system for providing effluent from at least one wastewater treatment plant
CN109553270A (en) * 2018-12-06 2019-04-02 江苏天舒电器有限公司 A kind of pump type heat enclosed sludge drying system and its control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101239773B (en) * 2008-03-14 2010-06-09 清华大学 Heat pump and sludge drying integration method and system
CN101492233B (en) * 2009-02-26 2010-12-08 大连理工大学 Drying plant for high-moisture percentage plaster pasty materials
CN103189582A (en) * 2010-05-20 2013-07-03 艾森索水业有限责任公司 Method and system for providing effluent from at least one wastewater treatment plant
CN103189582B (en) * 2010-05-20 2015-01-07 艾森索水业有限责任公司 Method and system for providing effluent from at least one wastewater treatment plant
CN102515462A (en) * 2012-01-11 2012-06-27 北京龙电宏泰环保科技有限公司 Energy-saving system applied to sludge treatment and disposal
CN109553270A (en) * 2018-12-06 2019-04-02 江苏天舒电器有限公司 A kind of pump type heat enclosed sludge drying system and its control method
CN109553270B (en) * 2018-12-06 2021-11-26 江苏天舒电器有限公司 Heat pump type closed sludge drying system and control method thereof

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Granted publication date: 20090128

Effective date of abandoning: 20080314