CN113149393B - Natural gas pressure energy driven sludge dewatering and drying system - Google Patents
Natural gas pressure energy driven sludge dewatering and drying system Download PDFInfo
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- CN113149393B CN113149393B CN202110284533.7A CN202110284533A CN113149393B CN 113149393 B CN113149393 B CN 113149393B CN 202110284533 A CN202110284533 A CN 202110284533A CN 113149393 B CN113149393 B CN 113149393B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 178
- 239000010802 sludge Substances 0.000 title claims abstract description 124
- 238000001035 drying Methods 0.000 title claims abstract description 93
- 239000003345 natural gas Substances 0.000 title claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000007791 dehumidification Methods 0.000 claims abstract description 5
- 238000003303 reheating Methods 0.000 claims abstract description 5
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 4
- 239000003507 refrigerant Substances 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
Abstract
The invention relates to a natural gas pressure energy driven sludge dewatering and drying system, which comprises: the natural gas driven sludge centrifugal dewatering system comprises an expander and a centrifugal dewatering machine, wherein the expander converts natural gas pressure energy from a medium-high pressure pipe network into mechanical energy to drive the centrifugal dewatering machine to realize sludge dewatering; the heat pump sludge drying system comprises a sludge drying chamber and a heat pump system, wherein air in the sludge drying chamber exchanges heat with the heat pump system to realize dehumidification and reheating cyclic utilization of wet air; the natural gas cold separation system comprises a gas wave refrigerator which converts natural gas pressure energy from a medium-high pressure pipe network into heat energy and absorbs the heat energy to obtain low-temperature natural gas, and the low-temperature natural gas exchanges heat with hot and humid air generated in a sludge drying chamber and is conveyed into the low-pressure pipe network. The invention combines the recycling of natural gas pressure energy with the sludge dewatering and drying treatment, improves the utilization rate of energy sources, and has better energy-saving benefit.
Description
Technical Field
The invention relates to the technical field of sludge dewatering and drying, in particular to a natural gas pressure energy driven sludge dewatering and drying system.
Background
In recent years, with the rapid development of economy and continuous improvement of urban level in China, the discharge amount of domestic sewage is increased, a large amount of sludge is generated in the sewage treatment process, the water content of the sludge is high, the treatment difficulty is high, and the sludge treatment becomes a huge problem for building green and environment-friendly cities. One of the key technologies in the whole process flow of sludge treatment is sludge dewatering treatment. Centrifugal dehydration is one of mechanical dehydration, has stable dehydration performance, is sanitary in production, can realize automation, and has been widely applied in developed countries abroad. However, due to the working principle and the treatment capacity of the centrifugal dehydrator, the energy consumption of the centrifugal dehydrator is extremely high, and the domestic applicability is low, so that the use frequency is low.
The final disposal of the dehydrated sludge mainly comprises landfill, agriculture, building materials, heat utilization and the like. According to the requirements of municipal sludge treatment industry standard of urban sewage plant sludge treatment mixed landfill muddy, the water content of the sludge mixed landfill needs to be lower than 60%, and the water content of the sludge when the sludge mixed landfill is used as landfill covering soil needs to be lower than 45%. However, the water content of the sludge after mechanical dehydration is still higher than the industry standard of sludge disposal. Therefore, in order to further reduce the water content of the sludge, the sludge needs to be dried after dehydration. In the sludge drying process, two problems are considered, namely, the energy consumption problem of drying the sludge to a lower water content is solved, the heat drying is often required to provide a higher temperature, and the drying energy consumption cost is higher due to the adoption of an external heat source under the condition of no waste heat and waste heat utilization; secondly, the volatilization of harmful substances in the sludge in the drying process is a problem, the components of the sludge are complex, a plurality of volatile harmful substances are often contained, and the volatilization of the harmful gases and the diffusion of dust can cause environmental pollution during heating and drying.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a natural gas pressure energy driven sludge dewatering and drying system, which solves the problem of high energy consumption of sludge drying.
The technical scheme adopted by the invention is as follows:
a natural gas pressure energy driven sludge dewatering and drying system comprising:
the natural gas driven sludge centrifugal dewatering system comprises an expander and a centrifugal dewatering machine, wherein the expander converts natural gas pressure energy from a medium-high pressure pipe network into mechanical energy to drive the centrifugal dewatering machine to realize sludge dewatering;
the heat pump sludge drying system comprises a sludge drying chamber and a heat pump system, wherein air in the sludge drying chamber exchanges heat with the heat pump system to realize dehumidification and reheating cyclic utilization of wet air;
the natural gas cold separation system comprises a gas wave refrigerator which converts natural gas pressure energy from a medium-high pressure pipe network into heat energy and absorbs the heat energy to obtain low-temperature natural gas, and the low-temperature natural gas exchanges heat with damp and hot air generated in the sludge drying chamber and is then conveyed into the low-pressure pipe network.
The further technical scheme is as follows:
the heat pump system comprises two heat pump cycles, wherein the first heat pump cycle comprises a loop formed by sequentially connecting a first evaporator, a first compressor, a first condenser and a first throttle valve; the second heat pump cycle comprises a loop formed by sequentially connecting a second condenser, a second throttle valve, a second evaporator and a second compressor; the first evaporator is used for cooling and dehumidifying hot and humid air exhausted from the sludge drying chamber, and the first condenser and the second condenser are used for heating the cooled and dehumidified air, and the heated hot air is discharged into the sludge drying chamber.
The second evaporator comprises a first group of refrigerant pipelines participating in the second heat pump cycle, and further comprises a second group of refrigerant pipelines exchanging heat with the first group of refrigerant pipelines, wherein the second group of refrigerant pipelines comprise an output pipe and an input pipe which are respectively connected with an outlet and an inlet of a refrigerant side pipeline of the air wave refrigerator; the refrigerant in the second set of refrigerant lines is used to absorb heat energy converted from natural gas pressure energy.
And a low-temperature heat exchanger is arranged at the downstream of the first evaporator and the upstream of the first condenser along the air flow direction, the low-temperature heat exchanger exchanges heat with the air by utilizing low-temperature natural gas, the hot and humid air is further cooled and dehumidified, one part of the low-temperature natural gas is from natural gas after working of the expansion machine, and the other part of the low-temperature natural gas is from natural gas after working of the gas wave refrigerator.
And the low-temperature natural gas is conveyed to a low-pressure pipe network communicated with the medium-high-pressure pipe network through original pressure regulating equipment through a pipeline after heat exchange of the low-temperature heat exchanger.
The natural gas driven sludge centrifugal dewatering system further comprises a speed regulator, and the expander, the speed regulator and the centrifugal dewatering machine are sequentially connected in a power mode.
The feeding of the centrifugal dehydrator is provided by a sludge clarifying tank, and the discharging of the centrifugal dehydrator is conveyed to the sludge drying chamber through a screw conveyor.
The inlet of the sludge drying chamber is provided with a sludge slicing machine, and the sludge drying chamber is internally provided with a drying table for accommodating sludge blocks cut by the sludge slicing machine.
The air side and the air outlet of the sludge drying chamber are respectively provided with a fan, the air side outlet of the sludge drying chamber is connected with one end of an air pipe, the air pipe is sequentially connected with the first evaporator, the low-temperature heat exchanger, the first condenser and the second condenser, and the other end of the air pipe is connected with the air side inlet of the sludge drying chamber to form a closed air circulation loop.
The gas wave refrigerator and the gas inlet of the expander are respectively connected with the medium-high pressure pipe network, and a quick shutoff valve is arranged on the connecting pipe.
The beneficial effects of the invention are as follows:
according to the invention, the expander is adopted to recycle the pressure energy in the high-pressure natural gas, and kinetic energy is output to provide power for the centrifugal dehydrator, so that the problems of high energy consumption and high cost of the centrifugal dehydrator are effectively solved. The low-temperature natural gas subjected to expansion and cooling is subjected to heat exchange in the low-temperature heat exchanger for cooling and dehumidifying the wet air, so that the energy consumption for reheating the low-temperature natural gas is saved, and the utilization rate of energy is improved.
The invention adopts the air wave refrigerator to effectively convert the pressure energy of the high-pressure natural gas into cold energy and heat energy, outputs the energy as a cold source of air for sludge drying, simultaneously provides an additional heat source for the evaporator of the heat pump cycle, further improves the temperature of the heat source, and widens the temperature range of the utilization of the pressure energy of the natural gas.
The invention adopts the air source heat pump for sludge drying, and the latent heat recovery during wet air condensation is used for heating the air, so that the energy consumption cost in the drying process is reduced. The air circulates in the closed space, thereby preventing harmful gas volatilized by the sludge from leaking in the drying process and reducing the pollution to the environment.
Drawings
Fig. 1 is a schematic diagram of a system structure according to the present invention.
In the figure: 1. quick shutoff valve I; 2. an expander; 3. a speed governor; 4. a centrifugal dehydrator; 5. a sludge clarifier; 6. a screw conveyor; 7. a first pressure regulating valve; 8. a low temperature heat exchanger; 9. a third pressure regulating valve; 10. a first evaporator; 11. a sludge slicer; 12. a first compressor; 13. a sludge drying chamber; 14. a first throttle valve; 15. a first condenser; 16. a second condenser; 17. a first fan; 18. a second fan; 19. a second quick shut-off valve; 20. an air wave refrigerator; 21. a second pressure regulating valve; 22. a second evaporator; 23. a second compressor; 24. and a second throttle valve.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the sludge dewatering and drying system driven by natural gas pressure energy of the embodiment includes: a natural gas driven sludge centrifugal dehydration system, a heat pump sludge drying system and a natural gas cold separation system;
the natural gas driven sludge centrifugal dewatering system comprises an expander 2 and a centrifugal dewatering machine 4, wherein the expander 2 converts pressure energy of natural gas from a medium-high pressure pipe network into mechanical energy to drive the centrifugal dewatering machine 4 to dewater sludge;
the heat pump sludge drying system comprises a sludge drying chamber 13 and a heat pump system, wherein air in the sludge drying chamber 13 exchanges heat with the heat pump system to realize dehumidification and reheating cyclic utilization of wet air;
the natural gas cold separation system comprises a gas wave refrigerator 20 which converts natural gas pressure energy from a medium-high pressure pipe network into heat energy and absorbs the heat energy to obtain low-temperature natural gas, and the low-temperature natural gas exchanges heat with hot and humid air generated by sludge drying in the sludge drying chamber 13 and is conveyed into the low-pressure pipe network.
In the above embodiment, the heat pump system includes two heat pump cycles, the first heat pump cycle including a circuit formed by sequentially connecting the first evaporator 10, the first compressor 12, the first condenser 15, and the first throttle valve 14; the second heat pump cycle includes a circuit formed by sequentially connecting a second condenser 16, a second throttle valve 24, a second evaporator 22, and a second compressor 23; the first evaporator 10 is used for cooling and dehumidifying hot and humid air discharged from the sludge drying chamber 13, the first condenser 15 and the second condenser 16 are used for heating the cooled and dehumidified air, and the heated hot air is discharged into the sludge drying chamber 13.
Specifically, fans, namely a first fan 17 and a second fan 18, are respectively arranged at the air side and the air outlet of the sludge drying chamber 13, one end of an air pipe (for simplicity, only the air flow direction is shown by arrows in the figure, and the physical structure of the air pipe is not shown) is connected with the air side outlet of the sludge drying chamber 13, the air pipe is sequentially connected with the shells of the first evaporator 10, the cryogenic heat exchanger 8, the first condenser 15 and the second condenser 16, and the other end of the air pipe is connected with the air side inlet of the sludge drying chamber 13 to form a closed air circulation loop.
In the above embodiment, the second evaporator 22 includes the first group of refrigerant lines participating in the second heat pump cycle, and further includes the second group of refrigerant lines exchanging heat with the first group of refrigerant lines, and the second group of refrigerant lines includes the output pipe and the input pipe connected to the outlet and the inlet of the refrigerant side line of the air wave refrigerator 20, respectively; the refrigerant in the second set of refrigerant lines is used to absorb heat energy converted from natural gas pressure energy.
As a preferred example, a low-temperature heat exchanger 8 is further arranged along the air flow direction and downstream of the first evaporator 10 and upstream of the first condenser 15, the low-temperature heat exchanger 8 exchanges heat with air by using low-temperature natural gas, and further cools and dehumidifies the hot and humid air, and one part of the low-temperature natural gas is from natural gas after the work is performed by the expander 2, and the other part of the low-temperature natural gas is from natural gas after the work is performed by the gas wave refrigerator 20. The low-temperature natural gas is conveyed to a low-pressure pipe network communicated with a medium-high-pressure pipe network through original pressure regulating equipment through a pipeline after heat exchange of the low-temperature heat exchanger 8.
The hot and humid air which absorbs the sludge moisture in the sludge drying chamber 13 is sent out from the drying chamber through a first fan 17, is cooled after passing through a first evaporator 10 and a low-temperature heat exchanger 8 in sequence, condenses the moisture in the humid air, is heated through a first condenser 15 and a second condenser 16, and is sent back to the drying chamber through a second fan 18; namely, the treatment of the wet air comprises two procedures of cooling, dehumidifying and heating, and an air pipe of the dehumidifying section is connected with a condensate pipe for discharging condensate generated by cooling, dehumidifying through the condensate pipe. The air pipes are sequentially connected with the shell of each heat exchanger (the first evaporator 10, the low-temperature heat exchanger 8, the first condenser 15 and the second condenser 16), namely, each heat exchanger can adopt a shell-and-tube structure, and the air and the refrigerant coil in the shell realize convection heat exchange.
In the embodiment, the natural gas driven sludge centrifugal dewatering system further comprises a speed regulator 3, and the expander 2, the speed regulator 3 and the centrifugal dewatering machine 4 are sequentially in power connection. The feeding of the centrifugal dehydrator 4 is provided by a sludge clarifier 5, and the discharging of the centrifugal dehydrator 4 is conveyed to a sludge drying chamber 13 through a screw conveyor 6. The inlet of the sludge drying chamber 13 is provided with a sludge slicer 11, and a drying table for accommodating sludge blocks cut by the sludge slicer 11 is arranged in the sludge drying chamber 13.
The workflow and principles of the above embodiment are as follows:
as shown in fig. 1, the high-pressure natural gas pipeline is connected with an inlet of an expander 2 and an inlet of a gas wave refrigerator 20 through a branch a and a branch b which are connected in parallel, and the branch a and the branch b are respectively connected with a quick shutoff valve 1 and a quick shutoff valve 19. The high-pressure natural gas of the branch a drives the expander 2 to do work, and the pressure energy of the natural gas is converted into mechanical energy for driving the speed regulator 3 and the centrifugal dehydrator 4 to work; the sludge generated in the sewage treatment plant is conveyed to the centrifugal dehydrator 4 after stable precipitation in the sludge clarifying tank 5, is discharged in the form of sludge sheets after dehydration in the centrifugal dehydrator 4, has the water content of about 70-80%, is conveyed to the sludge slicing machine 11 at the top of the sludge drying chamber 13 through the screw conveyor 6, is cut into bricks or strips through the sludge slicing machine 11, and automatically falls off or is conveyed to the drying table through the conveying mechanism for drying. The hot and humid air generated in the drying process is sent out from an air side outlet through a first fan 17, is sequentially subjected to heat exchange with the refrigerant side coils of the first evaporator 10, the low-temperature heat exchanger 8, the first condenser 15 and the second condenser 16 through air pipes, is subjected to cooling condensation (dehumidification) after passing through the first evaporator 10 and the low-temperature heat exchanger 8, is subjected to heating after passing through the first condenser 15 and the second condenser 16, and is subjected to air side inlet through a second fan 18. Is sent into a sludge drying chamber 13 to form circulation.
The pressure energy of the high-pressure natural gas in the branch b is converted into "heat energy" and "cold energy" in the gas wave refrigerator 20, and the gas wave refrigerator 20 is used as a device for refrigerating by using the pressure energy of the gas commonly in the prior art, and the working principle is as follows: the air wave refrigerator 20 is provided with a plurality of pulse tubes, and after high-pressure natural gas high-speed air flow from a medium-high pressure pipe network is sprayed into the pulse tubes with one closed end, original gas in the tubes is compressed, and shock waves are generated. After shock wave compression, the temperature of the gas in the tube rises sharply, and heat is transferred to the refrigerant in the second group of refrigerant pipelines through the tube wall. The air flow sprayed into the pipe transmits part of energy to the original gas in the pipe through dynamic compression and shock wave compression, so that the temperature of the air flow is reduced, and the part of low-temperature air flow can be led out from the air chamber to be used as a cold source. Therefore, the cold air wave refrigerator can generate heat energy and cold energy at the same time. The heat energy is carried away by the refrigerant in the second set of refrigerant lines of the cycle, exchanges heat with the refrigerant in the heat pump cycle of the second evaporator 22, and provides additional heat energy for the second heat pump cycle; the cold energy takes natural gas after acting as a carrier to form low-temperature natural gas, the low-temperature natural gas is output to the low-temperature heat exchanger 8 from the outlet of the gas wave refrigerator 20, a pressure regulating valve II 21 for regulating pressure is arranged on a pipeline, the cold energy is absorbed by the low-temperature heat exchanger 8, and the low-temperature natural gas is finally conveyed to a low-pressure pipe network after being regulated to a reasonable pressure range through a pressure regulating valve III 9.
Meanwhile, the low-temperature natural gas (or exhaust gas) expanded in the expander 2 in the branch a is conveyed to the low-temperature heat exchanger 8 after being subjected to pressure regulation by the first pressure regulating valve 7 through a pipeline, is mixed with the low-temperature natural gas subjected to work from the air wave refrigerator 20, further absorbs heat of wet air after heat exchange with air fed from an air pipe at the coil side of the low-temperature heat exchanger 8, and is conveyed to a low-pressure pipe network.
In the whole drying process, the working parameters of each heat exchanger are adjusted to adjust the heat exchange effect, so that the air temperature in the sludge drying chamber 13 is ensured to be 70-80 ℃, the drying time of the sludge in the drying chamber is 2-3 hours, and the water content of the dried sludge is 30-40%.
The air wave refrigerator can convert the pressure energy of the pressurized air into cold energy and heat, the lowest temperature can reach below-100 ℃, the highest temperature can reach 300 ℃, no other energy or power is needed, and the air wave refrigerator is utilized to convert the pressure energy of the high-pressure natural gas into heat energy and cold energy to supply the industrial production requirement.
The heat pump cycle of the heat pump sludge drying system is based on a mature heat pump technology, closed air circulation is adopted, and volatile matters in the drying process are sealed in a drying chamber and a circulating air duct, so that the volatile matters can be collected and purified and then uniformly discharged. The temperature required by the heat pump drying technology is not as high as more than hundreds of degrees as that of other drying technologies, and the heat pump cycle can effectively utilize low-temperature heat sources in production and life, effectively recover heat in air, has good energy-saving effect, and further reduces energy consumption cost in the drying process.
The natural gas driven sludge centrifugal dehydration system of the embodiment utilizes pressure energy to do work, and uses the spent gas after doing work for heat exchange with the dried air, and finally recovers the spent gas into a low-pressure pipe network, thereby fully utilizing the pressure energy and the cold energy of the natural gas.
The natural gas cold energy separation system of the embodiment utilizes the air wave refrigerator to convert pressure energy into cold energy to be further utilized by the low-temperature heat exchanger, and then heat energy generated in the working process is taken away by the refrigerant to provide additional heat for the evaporator of the second heat pump cycle.
In the prior art, the high-pressure pipe conveys the natural gas and contains extremely large pressure energy, but usually, the energy is released through the pressure regulation of a restrictor when the natural gas is conveyed to a pressure regulating station, and the pressure drop of the natural gas reaches several times or even tens times in the pressure regulating process, so that the pressure energy of the natural gas can be converted into mechanical energy or the pressure energy can be converted into heat energy. The expansion machine, the pneumatic motor and other devices can convert pressure energy into mechanical energy, and can drive the generator to generate electricity or the power device to operate. In consideration of the utilization mode of natural gas pressure energy and the energy consumption characteristic of sludge dewatering and drying, the sludge dewatering and drying system driven by the natural gas pressure energy can recycle the energy wasted by the pressure drop, and the energy utilization rate is improved by combining the sludge dewatering and drying treatment, so that the energy-saving system has better energy-saving benefit.
Claims (6)
1. The utility model provides a natural gas pressure energy driven sludge dewatering desiccation system which characterized in that includes:
the natural gas driven sludge centrifugal dehydration system comprises an expander (2) and a centrifugal dehydrator (4), wherein the expander (2) converts natural gas pressure energy from a medium-high pressure pipe network into mechanical energy to drive the centrifugal dehydrator (4) to realize sludge dehydration;
the heat pump sludge drying system comprises a sludge drying chamber (13) and a heat pump system, wherein air in the sludge drying chamber (13) exchanges heat with the heat pump system to realize dehumidification and reheating cyclic utilization of wet air;
the natural gas cold separation system comprises a gas wave refrigerator (20) which converts natural gas pressure energy from a medium-high pressure pipe network into heat energy and absorbs the heat energy to obtain low-temperature natural gas, and the low-temperature natural gas exchanges heat with hot and humid air generated by sludge drying in the sludge drying chamber (13) and is then conveyed into the low-pressure pipe network;
the heat pump system comprises two heat pump cycles, wherein the first heat pump cycle comprises a loop formed by sequentially connecting a first evaporator (10), a first compressor (12), a first condenser (15) and a first throttle valve (14); the second heat pump cycle comprises a loop formed by sequentially connecting a second condenser (16), a second throttle valve (24), a second evaporator (22) and a second compressor (23);
the first evaporator (10) is used for cooling and dehumidifying hot and humid air discharged from the sludge drying chamber (13), the first condenser (15) and the second condenser (16) are used for heating the cooled and dehumidified air, and the heated hot air is discharged into the sludge drying chamber (13);
the second evaporator (22) comprises a first group of refrigerant pipelines participating in the second heat pump cycle, and also comprises a second group of refrigerant pipelines exchanging heat with the first group of refrigerant pipelines, wherein the second group of refrigerant pipelines comprise an output pipe and an input pipe which are respectively connected with an outlet and an inlet of a refrigerant side pipeline of the air wave refrigerator (20); the refrigerant in the second set of refrigerant lines is used to absorb heat energy converted from natural gas pressure energy;
a low-temperature heat exchanger (8) is further arranged at the downstream of the first evaporator (10) and at the upstream of the first condenser (15) along the air flow direction, the low-temperature heat exchanger (8) exchanges heat with the air by utilizing low-temperature natural gas, the hot and humid air is further cooled and dehumidified, one part of the low-temperature natural gas is from natural gas after working of the expander (2), and the other part of the low-temperature natural gas is from natural gas after working of the gas wave refrigerator (20);
and the low-temperature natural gas is conveyed to a low-pressure pipe network communicated with the medium-high-pressure pipe network through original pressure regulating equipment through a pipeline after heat exchange of the low-temperature heat exchanger (8).
2. The natural gas pressure energy driven sludge dewatering and drying system according to claim 1, further comprising a speed regulator (3), wherein the expander (2), the speed regulator (3) and the centrifugal dehydrator (4) are sequentially in power connection.
3. The natural gas pressure energy driven sludge dewatering and drying system according to claim 1, characterized in that the feeding of the centrifugal dehydrator (4) is provided by a sludge clarifier (5), and the discharging of the centrifugal dehydrator (4) is conveyed to the sludge drying chamber (13) by a screw conveyor (6).
4. A natural gas pressure energy driven sludge dewatering and drying system according to claim 3, wherein a sludge slicer (11) is arranged at the inlet of the sludge drying chamber (13), and a drying table for accommodating sludge blocks cut by the sludge slicer (11) is arranged in the sludge drying chamber (13).
5. The natural gas pressure energy driven sludge dewatering and drying system according to claim 1, wherein a fan is respectively arranged at the air side and the air side of the sludge drying chamber (13), the air side outlet of the sludge drying chamber (13) is connected with one end of an air pipe, the air pipe is sequentially connected with the first evaporator (10), the low-temperature heat exchanger (8), the first condenser (15) and the second condenser (16) shell, and the other end of the air pipe is connected with the air side inlet of the sludge drying chamber (13) to form a closed air circulation loop.
6. The natural gas pressure energy driven sludge dewatering and drying system according to claim 1, wherein the gas inlets of the gas wave refrigerator (20) and the expander (2) are respectively connected with the medium-high pressure pipe network, and a quick shut-off valve is arranged on the connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110284533.7A CN113149393B (en) | 2021-03-16 | 2021-03-16 | Natural gas pressure energy driven sludge dewatering and drying system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110284533.7A CN113149393B (en) | 2021-03-16 | 2021-03-16 | Natural gas pressure energy driven sludge dewatering and drying system |
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| CN113149393A CN113149393A (en) | 2021-07-23 |
| CN113149393B true CN113149393B (en) | 2024-04-12 |
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