CN110981140A - Waste heat recycling method with water replenishing and backflow control functions for organic waste treatment process - Google Patents
Waste heat recycling method with water replenishing and backflow control functions for organic waste treatment process Download PDFInfo
- Publication number
- CN110981140A CN110981140A CN201911211457.6A CN201911211457A CN110981140A CN 110981140 A CN110981140 A CN 110981140A CN 201911211457 A CN201911211457 A CN 201911211457A CN 110981140 A CN110981140 A CN 110981140A
- Authority
- CN
- China
- Prior art keywords
- water
- temperature
- tank
- hot water
- backflow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a waste heat recycling method with water supplementing and backflow controlling functions for an organic waste treatment process, which comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a methane purification system, an oil extraction system, a medium-temperature hot water storage tank, an anaerobic tank system, a solar drying system, a multilayer anaerobic water tank, a multilayer drying water tank, a backflow control platform, a backflow water tank, a water supplementing control platform and a soft water system, wherein the gas boiler system is connected with the steam control platform through a pipeline; the problem of a large amount of waste of heat energy resources and 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.
Description
Technical Field
The invention relates to the technical field of environmental protection and renewable energy treatment, in particular to a waste heat recycling method with water replenishing and backflow control for an organic waste treatment process.
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 recycling method with water replenishing and backflow control for an organic waste treatment process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a waste heat recycling method with water supplementing and backflow controlling functions for an organic waste treatment process comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a methane purification system, an oil extraction system, a medium-temperature hot water storage tank, an anaerobic tank system, a solar drying system, a multilayer anaerobic water tank, a multilayer drying water tank, a backflow control platform, a backflow water tank, a water supplementing control platform and a soft water system; the system comprises a gas boiler system, a steam control platform, a methane purification system, a steam inlet of an oil extraction system, a pyrohydrolysis system, a methane purification system and a hot water outlet of the oil extraction system, wherein the steam control platform is respectively connected with a pyrohydrolysis system, the methane purification system and the steam inlet of the oil extraction system; 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, and the medium-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
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, and the high-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
5) the third part of high-temperature steam is sent into an oil extraction system, exchanges heat with a heating stirring tank in the oil extraction system and then is converted into high-temperature hot water, and the high-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
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) part of 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 an 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 multi-layer anaerobic water tank to be stored and insulated;
8) conveying the other part of the medium-temperature hot water in the medium-temperature hot water storage tank into a floor heating coil in the solar drying system by a water pump so as to maintain the constant temperature of the drying bed for heating the biological carbon soil, and refluxing the used warm water into the multi-layer drying water tank for storage and heat preservation;
9) the backflow control platform determines the entering flow speed gear and the number of used warm water layers of backflow warm water entering the backflow water tank from the multilayer anaerobic water tank and the multilayer drying water tank according to the preset temperature requirement;
10) the water supplementing control platform determines the water outlet flow speed and the water outlet flow of the backflow water tank and the soft water system according to preset requirements;
11) and feeding the mixed warm water of the reflux water tank and the soft water system 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 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.
Specifically, in step 9), the multilayer anaerobic water tank and the multilayer drying water tank are respectively set to be multilayer water storage structures, and are respectively provided with a temperature detection device in the multilayer anaerobic water tank and the multilayer drying water tank, when the preset temperature demand is higher, the backflow warm water stored in the corresponding water tank with higher current temperature displayed by the backflow control platform control temperature detection device flows into the backflow water tank with higher inflow velocity gear and more usage warm water layers, and the backflow warm water stored in the corresponding water tank with lower current temperature displayed by the temperature detection device is simultaneously controlled to flow into the backflow water tank with lower inflow velocity gear and less usage warm water layers.
Specifically, a step of determining whether the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time by comparing the difference value between the current flow rate detected by the reflux control platform under the corresponding flow rate entering gear and the preset flow rate with a preset threshold value is further included between the step 9) and the step 10); when the difference value between the current flow rate and the preset flow rate is smaller than a preset threshold value, the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank do not need to be cleaned in time; when the difference between the current flow rate and the preset flow rate is larger than the preset threshold value, the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time.
Specifically, the water supplementing control platform in the step 10) determines a preset water outlet quality ratio of the backflow water tank and the soft water system entering the gas boiler system according to a preset requirement, and determines the water outlet flow speed and the water outlet flow rate of the backflow water tank and the soft water system according to the preset water outlet quality ratio.
Specifically, the temperature of the high-temperature steam formed after combustion in the gas-fired boiler in the step 1) is 150-160 ℃.
In particular, the amount of the solvent to be used,
the temperature of the medium temperature hot water conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline in the step 3) is 50-60 ℃;
the temperature of the medium temperature hot water conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline in the step 4) is 60-70 ℃;
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 in the step 5) and stored 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 a hot water coil on the outer wall of an anaerobic tank in the anaerobic tank system in the step 7) is 30-40 ℃; the preset heat exchange value of the floor heating coil in the solar drying system in the step 8) is 30-40 ℃.
Specifically, the temperature of the warm water stored in the reflux water tank in the steps 7) and 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, does not have a major pollution source including impurities such as sludge and the like, and only has impurities such as paint chips and the like which are peeled off along with water flow in the water pipe, 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) The backflow water tank is characterized in that the backflow control platform determines the entering flow speed gear and the using warm water layer number of backflow warm water entering the backflow water tank from the multilayer anaerobic water tank and the multilayer drying water tank according to the preset temperature requirement, so that the temperature of mixed warm water entering the backflow water tank is within a preset safety range, the over-high or over-low temperature of the mixed warm water entering the backflow water tank is avoided, the use safety of the backflow water tank is affected, on the other hand, the higher or lower temperature of the mixed warm water entering the backflow water tank is avoided, and therefore the warm water in the backflow water tank is kept within a safe temperature range by additionally arranging a temperature adjusting device.
(5) The backflow control platform determines whether the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time through comparison between the current flow rate detected under the corresponding inlet flow rate gears and the preset flow rate and the preset threshold value, so that the filtering cleanliness of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank can be effectively guaranteed in time according to the comparison between the current flow rate and the preset flow rate, and the smooth water outlet of warm water of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank.
(6) The water supplementing control platform determines the preset ratio of the quality of the water flowing into the return water tank of the gas boiler system and the quality of the water flowing out of the soft water system according to the preset requirement, so that the circulating return water flowing into the gas boiler system at each time is ensured to meet the preset requirement.
Drawings
FIG. 1 is a flowchart of steps of a method for recycling waste heat in an organic waste treatment process with water replenishment and backflow control 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 recycling method with water supplementing and backflow controlling functions for an organic waste treatment process comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a methane purification system, an oil extraction system, a medium-temperature hot water storage tank, an anaerobic tank system, a solar drying system, a multilayer anaerobic water tank, a multilayer drying water tank, a backflow control platform, a backflow water tank, a water supplementing control platform and a soft water system; the system comprises a gas boiler system, a steam control platform, a methane purification system, a steam inlet of an oil extraction system, a pyrohydrolysis system, a methane purification system and a hot water outlet of the oil extraction system, wherein the steam control platform is respectively connected with a pyrohydrolysis system, the methane purification system and the steam inlet of the oil extraction system; 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, and the medium-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
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, and the high-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
5) the third part of high-temperature steam is sent into an oil extraction system, exchanges heat with a heating stirring tank in the oil extraction system and then is converted into high-temperature hot water, and the high-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
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) part of 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 an 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 multi-layer anaerobic water tank to be stored and insulated;
8) conveying the other part of the medium-temperature hot water in the medium-temperature hot water storage tank into a floor heating coil in the solar drying system by a water pump so as to maintain the constant temperature of the drying bed for heating the biological carbon soil, and refluxing the used warm water into the multi-layer drying water tank for storage and heat preservation;
9) the backflow control platform determines the entering flow speed gear and the number of used warm water layers of backflow warm water entering the backflow water tank from the multilayer anaerobic water tank and the multilayer drying water tank according to the preset temperature requirement;
10) the water supplementing control platform determines the water outlet flow speed and the water outlet flow of the backflow water tank and the soft water system according to preset requirements;
11) and feeding the mixed warm water of the reflux water tank and the soft water system 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.
In the step 9), the multilayer anaerobic water tank and the multilayer drying water tank are respectively set to be multilayer water storage structures, the uppermost layer is a water tank water inlet, the lowermost layer is a water tank water outlet, and the water inlets and the water outlets in the multilayer anaerobic water tank and the multilayer drying water tank are respectively provided with a temperature detection device; the water storage mode of the multilayer water tank is adopted, so that more return water can be conveniently stored, meanwhile, the temperature of the return water tends to be stable, when the return warm water of the multilayer water tank flows out, the return warm water at the lowest layer is discharged firstly, and then the return warm water at the upper layer sequentially enters the next layer after passing through respective filtering devices to ensure the cleanliness and the temperature stability of each layer of the return warm water;
a step of determining whether the filtering devices at the outlet positions of the water storage spaces in the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time by comparing the difference value between the current flow rate detected by the reflux control platform under the corresponding inlet flow rate gear and the preset flow rate with a preset threshold value is further included between the step 9) and the step 10); when the difference value between the current flow rate and the preset flow rate is smaller than a preset threshold value, the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank do not need to be cleaned in time; when the difference value between the current flow rate and the preset flow rate is larger than a preset threshold value, the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time; therefore, the filtering cleanliness of the multilayer anaerobic water tank and the multilayer drying water tank can be effectively ensured in time according to the comparison between the current flow rate and the preset flow rate, and the smooth water outlet of the multilayer anaerobic water tank and the multilayer drying water tank is ensured;
the water supplementing control platform in the step 10) determines a preset water outlet quality ratio of the backflow water tank and the soft water system entering the gas boiler system according to a preset requirement, and determines the water outlet flow speed and the water outlet flow rate of the backflow water tank and the soft water system according to the preset water outlet quality ratio; the water supplementing control platform determines the preset ratio of the quality of the water flowing into the return water tank of the gas boiler system and the quality of the water flowing out of the soft water system according to the preset requirement, so that the circulating return water flowing into the gas boiler system at each time is ensured to meet the preset requirement.
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 which is conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline in the step 3) and stored in the medium temperature hot water storage tank is 50-60 ℃.
Specifically, 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 in the step 4) and stored in the medium temperature hot water storage tank is 60-70 ℃.
Specifically, 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 in the step 5) and stored in the medium temperature hot water storage tank 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 on the outer wall of the anaerobic tank in the anaerobic tank system in the step 7) is 30-40 ℃.
Specifically, the preset heat exchange value of the floor heating coil in the solar drying system in the step 8) is 30-40 ℃.
Specifically, the temperature of the warm water stored in the reflux water tank in the steps 7) and 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 auxiliary heating floor heating system of the solar drying system plant directly takes water from the medium-temperature hot water storage tank to heat the drying bed, heat energy is provided for drying the biological carbon soil, and the warm water after heat exchange flows back to the backflow storage tank for storage at about 40 ℃.
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 (10)
1. A waste heat recycling method with water supplementing and backflow controlling functions for an organic waste treatment process comprises a gas boiler system, a steam control platform, a pyrohydrolysis system, a methane purification system, an oil extraction system, a medium-temperature hot water storage tank, an anaerobic tank system, a solar drying system, a multilayer anaerobic water tank, a multilayer drying water tank, a backflow control platform, a backflow water tank, a water supplementing control platform and a soft water system; the system comprises a gas boiler system, a steam control platform, a methane purification system, a steam inlet of an oil extraction system, a pyrohydrolysis system, a methane purification system and a hot water outlet of the oil extraction system, wherein the steam control platform is respectively connected with a pyrohydrolysis system, the methane purification system and the steam inlet of the oil extraction system; 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, and the medium-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
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, and the high-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
5) the third part of high-temperature steam is sent into an oil extraction system, exchanges heat with a heating stirring tank in the oil extraction system and then is converted into high-temperature hot water, and the high-temperature hot water is conveyed to a medium-temperature hot water storage tank through a water pump and a corresponding pipeline to be stored;
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) part of 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 an 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 multi-layer anaerobic water tank to be stored and insulated;
8) conveying the other part of the medium-temperature hot water in the medium-temperature hot water storage tank into a floor heating coil in the solar drying system by a water pump so as to maintain the constant temperature of the drying bed for heating the biological carbon soil, and refluxing the used warm water into the multi-layer drying water tank for storage and heat preservation;
9) the backflow control platform determines the entering flow speed gear and the number of used warm water layers of backflow warm water entering the backflow water tank from the multilayer anaerobic water tank and the multilayer drying water tank according to the preset temperature requirement;
10) the water supplementing control platform determines the water outlet flow speed and the water outlet flow of the backflow water tank and the soft water system according to preset requirements;
11) and feeding the mixed warm water of the reflux water tank and the soft water system into a gas boiler system to realize recycling.
2. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: 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 for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: in step 9), the multilayer anaerobic water tank and the multilayer drying water tank are respectively set to be multilayer water storage structures, and temperature detection devices are respectively arranged in the multilayer anaerobic water tank and the multilayer drying water tank, when the preset temperature requirement is high, backflow warm water stored in a corresponding water tank with higher current temperature displayed by the backflow control platform control temperature detection device flows into the backflow water tank with higher inflow velocity gear and more usage warm water layers, and backflow warm water stored in a corresponding water tank with lower current temperature displayed by the temperature detection device is simultaneously controlled to flow into the backflow water tank with lower inflow velocity gear and less usage warm water layers.
4. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: a step of determining whether the filtering devices at the outlet positions of the water storage spaces in the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time by comparing the difference value between the current flow rate detected by the reflux control platform under the corresponding inlet flow rate gear and the preset flow rate with a preset threshold value is further included between the step 9) and the step 10); when the difference value between the current flow rate and the preset flow rate is smaller than a preset threshold value, the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank do not need to be cleaned in time; when the difference between the current flow rate and the preset flow rate is larger than the preset threshold value, the filtering devices at the outlet positions of the water storage spaces of the multiple layers of the anaerobic water tank and the multiple layers of the drying water tank need to be cleaned in time.
5. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: and in the step 10), the water supplementing control platform determines a preset water outlet quality ratio of the backflow water tank and the soft water system entering the gas boiler system according to a preset requirement, and determines the water outlet flow speed and the water outlet flow rate of the backflow water tank and the soft water system according to the preset water outlet quality ratio.
6. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: the temperature of the high-temperature steam formed after the combustion in the gas boiler in the step 1) is 150-160 ℃.
7. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps:
the temperature of the medium temperature hot water conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline in the step 3) is 50-60 ℃;
the temperature of the medium temperature hot water conveyed to the medium temperature hot water storage tank through the water pump and the corresponding pipeline in the step 4) is 60-70 ℃;
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 in the step 5) and stored is 60-70 ℃.
8. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: 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 ℃.
9. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: the preset heat exchange value of a hot water coil on the outer wall of the anaerobic tank in the anaerobic tank system in the step 7) is 30-40 ℃; the preset heat exchange value of the floor heating coil in the solar drying system in the step 8) is 30-40 ℃.
10. The method for recycling the waste heat in the organic waste treatment process with the functions of water replenishing and backflow control as claimed in claim 1, wherein the method comprises the following steps: the temperature of the warm water stored in the reflux water tank in the steps 7) and 8) is maintained at 20-30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211457.6A CN110981140A (en) | 2019-12-02 | 2019-12-02 | Waste heat recycling method with water replenishing and backflow control functions for organic waste treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211457.6A CN110981140A (en) | 2019-12-02 | 2019-12-02 | Waste heat recycling method with water replenishing and backflow control functions for organic waste treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110981140A true CN110981140A (en) | 2020-04-10 |
Family
ID=70088969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911211457.6A Withdrawn CN110981140A (en) | 2019-12-02 | 2019-12-02 | Waste heat recycling method with water replenishing and backflow control functions for organic waste treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110981140A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899888A (en) * | 2022-11-15 | 2023-04-04 | 河南中烟工业有限责任公司 | Method and system for completely recycling waste heat of flash steam of condensed water in tobacco making in cigarette factory |
-
2019
- 2019-12-02 CN CN201911211457.6A patent/CN110981140A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899888A (en) * | 2022-11-15 | 2023-04-04 | 河南中烟工业有限责任公司 | Method and system for completely recycling waste heat of flash steam of condensed water in tobacco making in cigarette factory |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106523053B (en) | Solar heat and steam power plant's coupled electricity-generation and hot energy storage combined system and implementation method | |
| CN103604233A (en) | Process and system for using waste heat of steam of steam box | |
| CN101303201A (en) | Method of waste heat recovery utilization in cheese dyeing course | |
| CN203998973U (en) | Polycrystalline silicon reducing furnace heat energy utilization system | |
| CN110553238A (en) | Waste heat recovery device and method in organic waste treatment | |
| CN102849912B (en) | Sludge hydrolysis acidification system | |
| CN110981140A (en) | Waste heat recycling method with water replenishing and backflow control functions for organic waste treatment process | |
| CN206616128U (en) | A kind of Treatment of Sludge heat-exchange system | |
| CN202734350U (en) | A heat pump system utilizing a high-temperature waste water source | |
| CN110668666A (en) | Waste heat recovery method for floor heating coil of solar drying system | |
| CN203629109U (en) | Steam box steam waste heat utilization system | |
| CN110642491A (en) | Waste heat recovery method for hot water coil of anaerobic tank system | |
| CN110665945A (en) | Waste heat recovery and recycling method used in organic waste treatment process | |
| CN203820495U (en) | Energy-saving deoxidation system of industrial boiler | |
| CN205957136U (en) | A arrange sewage cycle heat transfer system for power boiler | |
| CN110566921A (en) | Gas boiler waste heat recycling device and method | |
| CN206522833U (en) | A kind of new injection type heat-exchange unit | |
| CN205748060U (en) | A kind of water-water heat-exchange unit using waste water residual heat | |
| CN206131420U (en) | Waste heat recovery utilizes system suitable for family | |
| CN210543427U (en) | Hot water circulating device for vinyl chloride production | |
| CN117989909B (en) | Device and method for comprehensively utilizing heat energy | |
| CN107741006A (en) | A kind of combustion gas distributed busbar protection | |
| CN106322350A (en) | Wastewater-discharge circulating heat exchange system for power station boiler and heat exchange method | |
| CN209005241U (en) | A kind of device improving heat source utilization efficiency | |
| CN204460715U (en) | A kind of chemical laboratory heating boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200410 |
|
| WW01 | Invention patent application withdrawn after publication |