CN110642491A - Waste heat recovery method for hot water coil of anaerobic tank system - Google Patents
Waste heat recovery method for hot water coil of anaerobic tank system Download PDFInfo
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- CN110642491A CN110642491A CN201910968025.3A CN201910968025A CN110642491A CN 110642491 A CN110642491 A CN 110642491A CN 201910968025 A CN201910968025 A CN 201910968025A CN 110642491 A CN110642491 A CN 110642491A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention relates to a waste heat recovery method for a hot water coil of an anaerobic tank system, which comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a biogas purification system, an oil extraction system, a medium-temperature hot water storage tank, an anaerobic tank system and a backflow water tank, wherein the steam control platform is connected with the pyrohydrolysis system; through the setting of each temperature control device, hot water after passing through the heat transfer process in each system of the follow thermal hydrolysis system, the marsh gas purification system and the oil extraction system can enter the medium temperature hot water storage tank as far as possible by approaching the preset temperature in the medium temperature hot water storage tank through the corresponding temperature control device, and then pass through the heating and cooling device of the medium temperature hot water storage tank, so that the mixed hot water entering the inside of the medium temperature hot water storage tank is subjected to temperature regulation to enable the heat preservation temperature of the mixed hot water inside the medium temperature hot water storage tank to approach the preset temperature range, thereby reducing the working time of the heating and cooling device of the medium temperature hot water storage tank, and avoiding the interruption of the working process of the whole waste heat recovery circulation system caused by overlo.
Description
Technical Field
The invention relates to the technical field of environmental protection and renewable energy treatment, in particular to a waste heat recovery method for a hot water coil of an anaerobic tank system.
Background
With the progress of society and the development of economy, the living standard of people is continuously improved, so that more and more kitchen wastes can be treated properly, and the food sanitation safety and the body health of people can be directly related; meanwhile, with the rapid development of the urban sewage treatment industry in China, the sludge production amount is increasing day by day. Therefore, synergistic solutions for kitchen waste and sludge from sewage plants have gradually appeared in the prior art.
The invention discloses a kitchen waste and sewage plant sludge cooperative treatment method (application publication No. CN106964633A, published Japanese 2017.07.21). The method not only can stably treat the kitchen waste and the domestic sludge to make the kitchen waste and the domestic sludge harmless and reduced, but also can produce available methane and garden biological carbon soil to change waste into valuable.
In the process, domestic sludge subjected to high-temperature pyrohydrolysis and kitchen waste enter an anaerobic digestion tank together for anaerobic digestion to generate biogas, biogas slurry and biogas residues. Biogas generated by the anaerobic tank enters a biogas cabinet for temporary storage, then passes through a biogas purification system, part of the biogas is supplied to a gas boiler to be combusted to generate steam for supplying heat to the system, and part of the biogas is made into natural gas and is merged into a city gas pipe network for residents to use. The biogas residue generated by the anaerobic tank is physically squeezed and dehydrated, and then is sent to a solar drying plant for drying to form biological carbon soil for landscaping. Meanwhile, a crude oil refining process can also be added in the process. After waste oil recovered from cities is separated by oil extraction area equipment, crude oil is extracted and sent to a storage tank for storage, and waste water and waste residue enter an anaerobic tank together with kitchen waste for anaerobic digestion.
However, in the first aspect, the gas-fired boiler mentioned in the above process often uses normal-temperature tap water, and after softening, the tap water enters an economizer to raise the temperature, and then enters a thermal deaerator to deaerate, and finally enters the boiler to become high-temperature steam. After high-temperature steam enters a high-temperature pyrohydrolysis system, the sludge is added by the steam, and after pyrohydrolysis is completed, the sludge is cooled to a proper temperature by cold water and enters an anaerobic tank for anaerobic digestion. The cooling water which obtains the heat of the high-temperature sludge is changed into medium-temperature hot water which cannot be reasonably utilized and discharged to a sewer, thereby causing huge heat energy and water resource waste.
In the second aspect, in the biogas purification system mentioned in the above process, a large amount of steam is often required to be introduced in the decarburization stage to supply heat to the circulating liquid, so as to separate carbon dioxide from the decarburization liquid. However, the steam entering the decarbonizing tower is changed into high-temperature hot water after supplying heat to the circulating liquid, and the high-temperature hot water is not reasonably utilized and discharged to a sewer, so that huge heat energy and water resource waste are caused.
In the third aspect, in the oil extraction process, after the waste oil is recovered, the waste oil firstly needs to enter a heating stirring tank for stirring and heating, and the waste oil is boiled out, so that the recovery rate of the waste oil is improved. In the heating process, steam is often used for directly heating the tank wall, the steam after heat exchange becomes high-temperature hot water, and the high-temperature hot water cannot be reasonably utilized and discharged to a sewer, so that huge heat energy and water resource waste are caused.
In a fourth aspect, the anaerobic tank mentioned in the above process is stabilized at a temperature throughout the year to meet the conditions for anaerobic digestion to produce biogas. In the anaerobic tank heat tracing process, steam is often directly used for primary heat exchange, circulating water on the wall of the tank is heated, the steam after heat exchange becomes high-temperature hot water, and the high-temperature hot water cannot be reasonably utilized and discharged to a sewer, so that huge heat energy and water resource waste are caused.
Finally, the solar drying plant mentioned in the process is internally provided with a floor heating auxiliary heating system, so that the biological carbon soil drying efficiency of the drying plant can be improved. At warm up water heating in-process, often directly use steam to carry out the one-level heat transfer, add the circulating water of warm up water pitcher, utilize the circulating pump to send into the mummification factory afterwards and heat biological carbon soil, the steam that the heat transfer has been accomplished becomes high temperature hot water, often can not obtain rational utilization and discharges to the sewer, causes huge heat energy, water waste.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a waste heat recovery method for a hot water coil of an anaerobic tank system.
The technical scheme adopted by the invention for solving the technical problems is as follows: a waste heat recovery method for a hot water coil of an anaerobic tank system comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a biogas purification system, an oil extraction system, a medium-temperature hot water storage tank, the anaerobic tank system and a backflow water tank; the system comprises a gas boiler system, a steam control platform, a hot water outlet of the thermal hydrolysis system, a methane purification system and a steam inlet of an oil extraction system, wherein the steam control platform is respectively connected with the steam inlet of the thermal hydrolysis system, the methane purification system and the oil extraction system; the first temperature control device, the second temperature control device and the third temperature control device are respectively connected with the temperature control platform; the method is characterized in that: the method comprises the following steps:
1) in a gas boiler system, water inlet of a soft water system is replaced by inlet reflux warm water, when the water quantity is insufficient, the water inlet is supplemented by the soft water system, high-temperature steam is formed after combustion of the gas boiler, and the high-temperature steam is divided into three parts and is respectively sent into a thermal hydrolysis system, a methane purification system and an oil extraction system;
2) the steam control platform determines the feeding sequence, feeding flow rate and feeding flow rate of the high-temperature steam in the step 1) which is fed into the thermal hydrolysis system, the methane purification system and the oil extraction system;
3) the first part of high-temperature steam is sent into a pyrohydrolysis system, exchanges heat with high-temperature sludge and then is converted into medium-temperature hot water, a temperature control platform controls a first temperature control device to regulate the temperature of the medium-temperature hot water converted after the high-temperature steam enters the pyrohydrolysis system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the medium-temperature hot water is conveyed to the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation through the first temperature control device;
4) the second part of high-temperature steam is sent into a methane purification system, exchanges heat with decarbonization liquid participating in decarbonization heat exchange and then is converted into high-temperature hot water, a temperature control platform controls a second temperature control device to regulate the temperature of the high-temperature hot water converted after the high-temperature steam enters the methane purification system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the high-temperature hot water is conveyed to the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation by the second temperature control device;
5) the third part of high-temperature steam is sent into the oil extraction system, exchanges heat with a heating stirring tank in the oil extraction system and is converted into high-temperature hot water, a temperature control platform controls a third temperature control device to regulate the temperature of the high-temperature hot water converted after the high-temperature steam enters the oil extraction system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the high-temperature hot water is conveyed into the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation by the third temperature control device;
6) the medium-temperature hot water storage tank is positioned at a position close to the middle parts of the pyrohydrolysis system, the methane purification system and the oil extraction system at the same time, and keeps the temperature of the mixed hot water entering the medium-temperature hot water storage tank;
7) the medium temperature hot water in the medium temperature hot water storage tank is conveyed to a hot water coil on the outer wall of an anaerobic tank in the anaerobic tank system by a water pump so as to maintain the constant temperature required by anaerobic digestion of the anaerobic tank, and the used warm water flows back to a backflow water tank for storage and heat preservation so as to enter a gas boiler system again for recycling;
8) and (4) directly feeding the warm water in the reflux water tank in the step 7) as reflux warm water into a gas boiler system to realize recycling.
Further, in the step 2), the feeding sequence of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of the temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding sequence of the high-temperature steam is more preferred when the difference is larger;
the feeding flow rate of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding flow rate of the high-temperature steam is faster as the difference is larger;
the feeding flow of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of the temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding flow of the high-temperature steam is increased when the difference is larger.
Further, in the steps 3) to 5), the temperature control platform determines the opening sequence of the first, second and third temperature control devices according to the difference between the preset temperature value of the medium-temperature hot water storage tank and the detection results of the temperature detection devices arranged at the outlet positions of the thermal hydrolysis system, the methane purification system and the oil extraction system, and the opening sequence of the corresponding temperature control device at the outlet of the system with the larger difference is more preferred;
the temperature control platform determines the storage time of hot water in the first, second and third temperature control devices according to the difference between the preset temperature value of the medium-temperature hot water storage tank and the detection results of the temperature detection devices arranged at the outlet positions of the thermal hydrolysis system, the methane purification system and the oil extraction system, and the storage time of the hot water at the outlet of the system in the corresponding temperature control device is longer when the difference is larger.
Further, the temperature of the high-temperature steam formed after the combustion in the gas-fired boiler in the step 1) is 150-160 ℃.
Further, it is characterized in that:
the temperature of the medium-temperature hot water which is conveyed to the medium-temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the first temperature control device in the step 3) and is stored is 50-60 ℃;
the temperature of the medium-temperature hot water which is conveyed to the medium-temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the second temperature control device in the step 4) and is stored is 60-70 ℃;
and (3) the medium temperature hot water which is conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the third temperature control device in the step 5) is stored at the temperature of 60-70 ℃.
Further, the medium temperature hot water storage tank in the step 6) is provided with a heating and cooling device to adjust the temperature of the mixed hot water entering the medium temperature hot water storage tank so that the heat preservation temperature of the mixed hot water in the medium temperature hot water storage tank is 40-50 ℃.
Further, the preset heat exchange value of a hot water coil in the anaerobic tank system in the step 7) is 30-40 ℃.
Further, the temperature of the warm water stored in the reflux water tank in the step 8) is maintained at 20 to 30 ℃.
The invention has the beneficial effects that:
(1) aiming at the problem of great waste of heat energy resources and water resources, the method for recycling and reusing the waste heat in the organic waste treatment process is provided, the problem of great waste of the heat energy resources and the water resources in the operation process can be solved, the production efficiency is improved, the operation cost is reduced, and energy conservation and emission reduction are realized.
(2) In the whole circulation, water is only used for transferring heat, belongs to a heat transfer medium, and has no other adverse factors such as water pollution, so that the water can be directly conveyed to a boiler system for cyclic utilization, the cyclic utilization rate is high, and the energy-saving and environment-friendly effects are achieved.
(3) Through the setting of the steam control platform, the feeding sequence, the feeding flow speed and the feeding flow of high-temperature steam fed into each system are determined according to the difference value between the temperature detection value and the heat exchange preset value in each system of the thermal hydrolysis system, the methane purification system and the oil extraction system, so that the temperature balance and the heat circulation in the heat exchange process through the high-temperature steam in the whole system are effectively realized, and the possibility of safety accidents caused by local overheating due to untimely heat exchange is reduced.
(4) Through the arrangement of the first temperature control device, the second temperature control device and the third temperature control device, hot water after the heat exchange process in each system of the thermal hydrolysis system, the methane purification system and the oil extraction system can enter the medium-temperature hot water storage tank as close as possible to the preset temperature in the medium-temperature hot water storage tank through the corresponding temperature control devices, and then enter the heating and cooling devices of the medium-temperature hot water storage tank through the heating and cooling devices, so that the mixed hot water entering the heating and cooling devices is subjected to temperature regulation to enable the heat preservation temperature of the mixed hot water inside the heating and cooling devices to be close to the preset temperature range, the working time of the heating and cooling devices of the medium-temperature hot water storage tank is reduced, and the interruption of the working process of the whole waste heat recovery circulation system.
Drawings
FIG. 1 is a flow chart of the steps of a method of waste heat recovery for use in a hot water coil of an anaerobic tank system according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
A waste heat recovery method for a hot water coil of an anaerobic tank system comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a biogas purification system, an oil extraction system, a medium-temperature hot water storage tank, the anaerobic tank system and a backflow water tank; the system comprises a gas boiler system, a steam control platform, a hot water outlet of the thermal hydrolysis system, a methane purification system and a steam inlet of an oil extraction system, wherein the steam control platform is respectively connected with the steam inlet of the thermal hydrolysis system, the methane purification system and the oil extraction system; the first temperature control device, the second temperature control device and the third temperature control device are respectively connected with the temperature control platform; the invention utilizes the circulation idea that high-temperature steam is generated from a heat source to perform high-temperature heat source utilization, the rest heat is recovered, the waste heat is conveyed to other systems to perform medium-temperature utilization, and finally the warm water after medium-temperature utilization returns to the high-temperature heat source to be reheated, thereby realizing the cyclic utilization of heat energy and water resources and saving energy.
The method comprises the following steps:
1) in a gas boiler system, water inlet of a soft water system is replaced by inlet reflux warm water, when the water quantity is insufficient, the water inlet is supplemented by the soft water system, high-temperature steam is formed after combustion of the gas boiler, and the high-temperature steam is divided into three parts and is respectively sent into a thermal hydrolysis system, a methane purification system and an oil extraction system;
2) the steam control platform determines the feeding sequence, feeding flow rate and feeding flow rate of the high-temperature steam in the step 1) which is fed into the thermal hydrolysis system, the methane purification system and the oil extraction system;
3) the first part of high-temperature steam is sent into a pyrohydrolysis system, exchanges heat with high-temperature sludge and then is converted into medium-temperature hot water, a temperature control platform controls a first temperature control device to regulate the temperature of the medium-temperature hot water converted after the high-temperature steam enters the pyrohydrolysis system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the medium-temperature hot water is conveyed to the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation through the first temperature control device;
4) the second part of high-temperature steam is sent into a methane purification system, exchanges heat with decarbonization liquid participating in decarbonization heat exchange and then is converted into high-temperature hot water, a temperature control platform controls a second temperature control device to regulate the temperature of the high-temperature hot water converted after the high-temperature steam enters the methane purification system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the high-temperature hot water is conveyed to the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation by the second temperature control device;
5) the third part of high-temperature steam is sent into the oil extraction system, exchanges heat with a heating stirring tank in the oil extraction system and is converted into high-temperature hot water, a temperature control platform controls a third temperature control device to regulate the temperature of the high-temperature hot water converted after the high-temperature steam enters the oil extraction system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the high-temperature hot water is conveyed into the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation by the third temperature control device;
6) the medium-temperature hot water storage tank is positioned at a position close to the middle parts of the pyrohydrolysis system, the methane purification system and the oil extraction system at the same time, and keeps the temperature of the mixed hot water entering the medium-temperature hot water storage tank;
7) the medium temperature hot water in the medium temperature hot water storage tank is conveyed to a hot water coil on the outer wall of an anaerobic tank in the anaerobic tank system by a water pump so as to maintain the constant temperature required by anaerobic digestion of the anaerobic tank, and the used warm water flows back to a backflow water tank for storage and heat preservation so as to enter a gas boiler system again for recycling;
8) and (4) directly feeding the warm water in the reflux water tank in the step 7) as reflux warm water into a gas boiler system to realize recycling.
Specifically, in the step 2), the feeding sequence of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of the temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding sequence of the high-temperature steam is more preferred when the difference is larger; the larger the difference is, the more the required heat exchange time is, so that the larger the difference is, the higher the feeding sequence of the high-temperature steam is, the more the hot water outflow time after the heat exchange at the outlet of the system is close, the collection of the medium-temperature hot water storage tank is further facilitated, the realization of the temperature balance and the heat circulation in the heat exchange process through the high-temperature steam in the whole system is facilitated, and the possibility of safety accidents caused by local overheating due to untimely heat exchange is reduced;
the feeding flow rate of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding flow rate of the high-temperature steam is faster as the difference is larger; the larger the difference is, the more the required heat exchange time is, so that the larger the difference is, the faster the feeding flow rate of the high-temperature steam is, the closer the hot water outflow time after the heat exchange at the outlet of the system is, the convenience is brought to the collection of the medium-temperature hot water storage tank, the realization of the temperature balance and the heat circulation in the heat exchange process through the high-temperature steam in the whole system is facilitated, and the possibility of safety accidents caused by local overheating due to untimely heat exchange is reduced;
the feeding flow of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding flow of the high-temperature steam is increased when the difference is larger; the larger the difference is, the more the required heat exchange steam is, so that the larger the difference is, the more the high-temperature steam is sent, the more the temperature balance and heat circulation in the heat exchange process can be realized through the high-temperature steam in the whole system, and the possibility of safety accidents caused by local overheating due to untimely heat exchange is reduced.
Specifically, in the steps 3) to 5), the temperature control platform determines the starting sequence of the first, second and third temperature control devices according to the difference between the preset temperature value of the medium-temperature hot water storage tank and the detection results of the temperature detection devices arranged at the outlet positions of the thermal hydrolysis system, the methane purification system and the oil extraction system, and the starting sequence of the corresponding temperature control device at the outlet of the system with the larger difference is more preferred; the larger the difference is, the more the required working time of the corresponding temperature control device is relatively increased, so that the larger the difference is, the higher the starting sequence of the corresponding temperature control device is, the higher the priority is, hot water can enter the medium-temperature hot water storage tank at a similar time, the temperature balance and heat circulation in the heat exchange process in the whole system can be realized, and the possibility of interruption of local waste heat circulation caused by more heat exchange time due to larger heat exchange temperature difference is reduced;
the temperature control platform determines the storage time of hot water in the first, second and third temperature control devices according to the difference value between the temperature preset value of the medium-temperature hot water storage tank and the detection result of the temperature detection device arranged at the outlet position of the pyrohydrolysis system, the methane purification system and the oil extraction system, and the storage time of the hot water at the outlet of the system in the corresponding temperature control device is longer when the difference value is larger; the larger the difference is, the more the required working time of the corresponding temperature control device is, so that the longer the difference is, the longer the storage time of the corresponding temperature control device is, and the hot water can enter the medium-temperature hot water storage tank at a similar temperature, thereby being beneficial to realizing the temperature balance and the heat circulation in the heat exchange process in the whole system and reducing the possibility of interruption of the local waste heat circulation caused by more heat exchange time due to larger heat exchange temperature difference.
Specifically, the temperature of the high-temperature steam formed after combustion in the gas-fired boiler in the step 1) is 150-160 ℃.
Specifically, the temperature of the medium temperature hot water in the step 3) is 50-60 ℃ after passing through the first temperature control device and then is conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline for storage.
Specifically, the temperature of the medium temperature hot water in the step 4) which is conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the second temperature control device is 60-70 ℃.
Specifically, the temperature of the medium temperature hot water in the step 5) which is conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the third temperature control device is 60-70 ℃.
Specifically, the medium temperature hot water storage tank in step 6) is provided with a heating and cooling device to adjust the temperature of the mixed hot water entering the medium temperature hot water storage tank so that the heat preservation temperature of the mixed hot water in the medium temperature hot water storage tank is 40-50 ℃.
Specifically, the preset heat exchange value of the hot water coil in the anaerobic tank system in the step 7) is 30-40 ℃.
Specifically, the temperature of the warm water stored in the reflux water tank in the step 8) is maintained at 20 to 30 ℃.
Taking an organic matter processing center of a certain city in Jiangsu as an example, the original processing technology is as follows: directly feeding normal-temperature tap water into a gas boiler system; the defects and shortcomings are as follows:
1) a large amount of hot water after the sludge is thermally hydrolyzed at high temperature through heat exchange cannot be effectively utilized;
2) a large amount of hot water after the decarbonization liquid of the heat exchange methane purification system cannot be effectively utilized;
3) a large amount of hot water after the heat exchange oil extraction system heats the stirring tank cannot be effectively utilized;
4) the anaerobic tank system adopts steam for carrying out primary heat exchange heating tracing system, so that a large amount of energy is wasted;
5) the solar drying auxiliary heating system adopts steam to perform primary heat exchange heating auxiliary heating floor heating system, and a large amount of energy is wasted.
After the transformation, the returned warm water is directly used to enter a gas boiler system, the gas boiler burns methane, and the gas boiler system generates high-temperature steam with the temperature of about 160 ℃; the high temperature steam is then used in three portions: wherein
After directly entering a thermal hydrolysis system, the first part of high-temperature steam firstly heats a thermal hydrolysis tank, then enters a slurry machine to be mixed with sludge, and finally the sludge is heated to about 120 ℃; then, cold water and thermal hydrolysis sludge are used for heat exchange to enable the sludge to reach the feeding condition of an anaerobic tank at about 40 ℃, the temperature of the heat exchanged water is about 50 ℃, and the water is pumped to a medium-temperature hot water storage tank for storage;
the second part of high-temperature steam enters a methane purification system, is converted into high-temperature hot water at about 70 ℃ after exchanging heat with the decarbonization liquid, and is pumped to a medium-temperature hot water storage tank by a water pump for storage;
the third part of high-temperature steam enters an oil extraction system heating stirring tank to be converted into high-temperature hot water at about 70 ℃ after heat exchange, and the high-temperature hot water is pumped to a medium-temperature hot water storage tank by a water pump to be stored;
the medium-temperature hot water storage tank is positioned in the center of a plant area, so that the conveying cost and the heat loss are reduced, and the water temperature in the tank is maintained at about 50 ℃;
the anaerobic tank system needs a temperature environment of about 40 ℃ to stabilize anaerobic digestion in the tank, water is directly taken from a medium-temperature hot water storage tank, heat loss during transmission is removed, and the water inlet temperature is about 40 ℃, so that the requirement of a heat tracing system is met; the hot water after heat exchange flows to a reflux water tank for storage;
the backflow storage tank is arranged at the water inlet of the boiler room, the water temperature in the backflow storage tank is maintained at about 30 ℃, and water is directly supplied to a boiler system. After the transformation, a large amount of heat energy resources and water resources are saved, and the operation cost is greatly reduced.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A waste heat recovery method for a hot water coil of an anaerobic tank system comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a biogas purification system, an oil extraction system, a medium-temperature hot water storage tank, the anaerobic tank system and a backflow water tank; the system comprises a gas boiler system, a steam control platform, a hot water outlet of the thermal hydrolysis system, a methane purification system and a steam inlet of an oil extraction system, wherein the steam control platform is respectively connected with the steam inlet of the thermal hydrolysis system, the methane purification system and the oil extraction system; the first temperature control device, the second temperature control device and the third temperature control device are respectively connected with the temperature control platform; the method is characterized in that: the method comprises the following steps:
1) in a gas boiler system, water inlet of a soft water system is replaced by inlet reflux warm water, when the water quantity is insufficient, the water inlet is supplemented by the soft water system, high-temperature steam is formed after combustion of the gas boiler, and the high-temperature steam is divided into three parts and is respectively sent into a thermal hydrolysis system, a methane purification system and an oil extraction system;
2) the steam control platform determines the feeding sequence, feeding flow rate and feeding flow rate of the high-temperature steam in the step 1) which is fed into the thermal hydrolysis system, the methane purification system and the oil extraction system;
3) the first part of high-temperature steam is sent into a pyrohydrolysis system, exchanges heat with high-temperature sludge and then is converted into medium-temperature hot water, a temperature control platform controls a first temperature control device to regulate the temperature of the medium-temperature hot water converted after the high-temperature steam enters the pyrohydrolysis system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the medium-temperature hot water is conveyed to the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation through the first temperature control device;
4) the second part of high-temperature steam is sent into a methane purification system, exchanges heat with decarbonization liquid participating in decarbonization heat exchange and then is converted into high-temperature hot water, a temperature control platform controls a second temperature control device to regulate the temperature of the high-temperature hot water converted after the high-temperature steam enters the methane purification system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the high-temperature hot water is conveyed to the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation by the second temperature control device;
5) the third part of high-temperature steam is sent into the oil extraction system, exchanges heat with a heating stirring tank in the oil extraction system and is converted into high-temperature hot water, a temperature control platform controls a third temperature control device to regulate the temperature of the high-temperature hot water converted after the high-temperature steam enters the oil extraction system for heat exchange according to a preset temperature value of a medium-temperature hot water storage tank, and the high-temperature hot water is conveyed into the medium-temperature hot water storage tank for storage through a water pump and a corresponding pipeline after being subjected to temperature regulation by the third temperature control device;
6) the medium-temperature hot water storage tank is positioned at a position close to the middle parts of the pyrohydrolysis system, the methane purification system and the oil extraction system at the same time, and keeps the temperature of the mixed hot water entering the medium-temperature hot water storage tank;
7) the medium temperature hot water in the medium temperature hot water storage tank is conveyed to a hot water coil on the outer wall of an anaerobic tank in the anaerobic tank system by a water pump so as to maintain the constant temperature required by anaerobic digestion of the anaerobic tank, and the used warm water flows back to a backflow water tank for storage and heat preservation so as to enter a gas boiler system again for recycling;
8) and (4) directly feeding the warm water in the reflux water tank in the step 7) as reflux warm water into a gas boiler system to realize recycling.
2. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein: in the step 2), the feeding sequence of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of the temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding sequence of the high-temperature steam is more preferred when the difference is larger;
the feeding flow rate of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding flow rate of the high-temperature steam is faster as the difference is larger;
the feeding flow of the high-temperature steam is determined by a steam control platform according to the difference between the detection results of the temperature detection devices arranged in the thermal hydrolysis system, the methane purification system and the oil extraction system and the heat exchange preset value in the corresponding system, and the feeding flow of the high-temperature steam is increased when the difference is larger.
3. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein: in the steps 3) to 5), the temperature control platform determines the starting sequence of the first, second and third temperature control devices according to the difference between the preset temperature value of the medium-temperature hot water storage tank and the detection results of the temperature detection devices arranged at the outlet positions of the thermal hydrolysis system, the methane purification system and the oil extraction system, and the starting sequence of the corresponding temperature control device at the outlet of the system with the larger difference is more preferred;
the temperature control platform determines the storage time of hot water in the first, second and third temperature control devices according to the difference between the preset temperature value of the medium-temperature hot water storage tank and the detection results of the temperature detection devices arranged at the outlet positions of the thermal hydrolysis system, the methane purification system and the oil extraction system, and the storage time of the hot water at the outlet of the system in the corresponding temperature control device is longer when the difference is larger.
4. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein: the temperature of the high-temperature steam formed after the combustion in the gas boiler in the step 1) is 150-160 ℃.
5. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein:
the temperature of the medium-temperature hot water which is conveyed to the medium-temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the first temperature control device in the step 3) and is stored is 50-60 ℃;
the temperature of the medium-temperature hot water which is conveyed to the medium-temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the second temperature control device in the step 4) and is stored is 60-70 ℃;
and (3) the medium temperature hot water which is conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline after passing through the third temperature control device in the step 5) is stored at the temperature of 60-70 ℃.
6. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein: and the medium-temperature hot water storage tank in the step 6) is provided with a heating and cooling device to regulate the temperature of the mixed hot water entering the medium-temperature hot water storage tank so that the heat preservation temperature of the mixed hot water in the medium-temperature hot water storage tank is 40-50 ℃.
7. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein: the preset heat exchange value of the hot water coil in the anaerobic tank system in the step 7) is 30-40 ℃.
8. The method of claim 1 for recovering waste heat in a hot water coil of an anaerobic tank system, wherein: the temperature of the warm water stored in the reflux water tank in the step 8) is maintained at 20-30 ℃.
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