CN113149393A - Sludge dewatering and drying system driven by natural gas pressure energy - Google Patents
Sludge dewatering and drying system driven by natural gas pressure energy Download PDFInfo
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- CN113149393A CN113149393A CN202110284533.7A CN202110284533A CN113149393A CN 113149393 A CN113149393 A CN 113149393A CN 202110284533 A CN202110284533 A CN 202110284533A CN 113149393 A CN113149393 A CN 113149393A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 239000010802 sludge Substances 0.000 title claims abstract description 134
- 238000001035 drying Methods 0.000 title claims abstract description 99
- 239000003345 natural gas Substances 0.000 title claims abstract description 92
- 239000007789 gas Substances 0.000 claims abstract description 31
- 230000018044 dehydration Effects 0.000 claims abstract description 19
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 19
- 238000007791 dehumidification Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 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 13
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005352 clarification Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 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 5
- 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
- 239000011449 brick Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
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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
- C02F11/13—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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge dewatering and drying system driven by natural gas pressure energy, which comprises: the natural gas driven sludge centrifugal dehydration system comprises an expander and a centrifugal dehydrator, wherein the expander converts the pressure energy of natural gas from a medium-high pressure pipe network into mechanical energy to drive the centrifugal dehydrator to realize sludge dehydration; 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 humid air; the natural gas cold quantity separation system comprises a gas wave refrigerator, wherein the gas wave refrigerator converts the pressure energy of natural gas 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 a sludge drying chamber and is then conveyed to a low-pressure pipe network. The invention combines the recycling of natural gas pressure energy with sludge dehydration 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 sludge dewatering and drying system driven by natural gas pressure energy.
Background
In recent years, with the rapid development of economy and the continuous improvement of urbanization level in China, the discharge amount of domestic sewage is increasing day by day, a large amount of sludge is generated in the sewage treatment process, the sludge moisture content is high, the treatment difficulty is high, and the sludge treatment becomes a great problem in 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, sanitary production and automation realization, and is widely applied in developed countries abroad. But because of the working principle and the processing capacity of the centrifugal dehydrator, the energy consumption of the centrifugal dehydrator is extremely large, and the domestic applicability is not high, so that the use frequency is low.
The final treatment of the dewatered sludge mainly comprises landfill, agriculture, building material, heat utilization and other modes. According to the requirements of municipal sludge disposal industry standard ' sludge disposal mixed landfill argillaceous ' of urban sewage plants ', the water content of the sludge mixed landfill needs to be lower than 60%, and when the sludge mixed landfill argillaceous is used as landfill covering soil, the water content of the sludge needs to be lower than 45%. However, the water content of the sludge after mechanical dehydration is still higher than the industrial standard of sludge disposal. Therefore, in order to further reduce the water content of the sludge, the sludge needs to be dried after being dewatered. Two problems are considered in the sludge drying process, namely the energy consumption problem of drying the sludge to lower water content is solved, the heat drying usually needs to provide 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 utilization; and secondly, the volatilization of harmful substances in the sludge in the drying process is caused, the sludge is complex in components and often contains a plurality of volatile harmful substances, and the volatilization of 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 sludge dewatering and drying system driven by natural gas pressure energy, and solves the problem of high energy consumption of sludge drying.
The technical scheme adopted by the invention is as follows:
a sludge dewatering and drying system driven by natural gas pressure energy comprises:
the natural gas driven sludge centrifugal dehydration system comprises an expander and a centrifugal dehydrator, wherein the expander converts the pressure energy of natural gas from a medium-high pressure pipe network into mechanical energy to drive the centrifugal dehydrator to realize sludge dehydration;
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 humid air;
the natural gas cold quantity separation system comprises a gas wave refrigerator, wherein the gas wave refrigerator converts the pressure energy of natural gas 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 is conveyed to a low-pressure pipe network after exchanging heat with damp and hot air generated in a sludge drying chamber.
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 throttling 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, the first condenser and the second condenser are used for heating air after cooling and dehumidifying, and the heated hot air is exhausted into the sludge drying chamber.
The second evaporator comprises a first group of refrigerant pipelines participating in the second heat pump cycle and a second group of refrigerant pipelines exchanging heat with the first group of refrigerant pipelines, and the second group of refrigerant pipelines comprises an output pipe and an input pipe which are respectively connected with an outlet and an inlet of a refrigerant side pipeline of the gas wave refrigerator; the refrigerant in the second group of refrigerant lines is used for absorbing heat energy converted from natural gas pressure energy.
And a low-temperature heat exchanger is arranged at the downstream of the first evaporator and at the upstream of the first condenser along the air flowing direction, the low-temperature heat exchanger utilizes low-temperature natural gas to exchange heat with air to further cool and dehumidify hot humid air, one part of the low-temperature natural gas is from the natural gas after the expander works, and the other part of the low-temperature natural gas is from the natural gas after the air wave refrigerator works.
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 being subjected to heat exchange by the low-temperature heat exchanger.
The natural gas driven sludge centrifugal dehydration system further comprises a speed regulator, and the expander, the speed regulator and the centrifugal dehydrator are sequentially in power connection.
The feeding of the centrifugal dehydrator is provided by a sludge clarification tank, and the discharging of the centrifugal dehydrator is conveyed to the sludge drying chamber through a screw conveyer.
The sludge drying chamber is characterized in that a sludge slicing machine is arranged at an inlet of the sludge drying chamber, and a drying table used for containing sludge blocks cut by the sludge slicing machine is arranged in the sludge drying chamber.
The air side of the sludge drying chamber and the 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 shell of the first condenser and the shell of 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 expansion machine are respectively connected with the medium-high pressure pipe network, and a quick shut-off valve is arranged on the connecting pipeline.
The invention has the following beneficial effects:
the invention adopts the expander to recover the pressure energy in the high-pressure natural gas and outputs the kinetic energy to provide power for the centrifugal dehydrator, thereby effectively solving the problem of high energy consumption and high cost in the operation of the centrifugal dehydrator. The expanded and cooled low-temperature natural gas exchanges heat in the low-temperature heat exchanger to be used for cooling and dehumidifying the humid air, the energy consumption of 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 the cold source of the air for drying the sludge and provides an additional heat source for the evaporator of the heat pump circulation, 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, recovers latent heat when the wet air is condensed to heat the air, and reduces the energy consumption cost in the drying process. The air circulates in the closed space, so that the leakage of harmful gas volatilized by the sludge in the drying process is prevented, and the pollution to the environment is reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: 1. rapidly closing the first valve; 2. an expander; 3. a speed regulator; 4. a centrifugal dehydrator; 5. a sludge clarification tank; 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 slicing machine; 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. quickly closing the valve II; 20. a gas wave refrigerator; 21. a second pressure regulating valve; 22. a second evaporator; 23. a second compressor; 24. a second throttle valve.
Detailed Description
The following describes 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 this embodiment includes: the system comprises a natural gas driven sludge centrifugal dehydration system, a heat pump sludge drying system and a natural gas cold energy separation system;
the natural gas driven sludge centrifugal dehydration system comprises an expander 2 and a centrifugal dehydrator 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 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 humid air;
the natural gas cold quantity separation system comprises a gas wave refrigerator 20, wherein the gas wave refrigerator converts the pressure energy of natural gas 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 by sludge drying in the sludge drying chamber 13 and then is conveyed into a low-pressure pipe network.
In the above embodiment, the heat pump system includes two heat pump cycles, the first heat pump cycle includes a loop 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 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 the hot and humid air exhausted 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 exhausted into the sludge drying chamber 13.
Specifically, fans are respectively arranged at an air side inlet and an air side outlet of the sludge drying chamber 13, the fans are respectively a first fan 17 and a second fan 18, the air side outlet of the sludge drying chamber 13 is connected with one end of an air pipe (for simplification, the air flow direction is only indicated by an arrow in the figure, and the physical structure of the air pipe is not shown), the air pipe is sequentially connected with the shells of the first evaporator 10, the low-temperature 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 a first group of refrigerant pipelines participating in the second heat pump cycle, and further includes a second group of refrigerant pipelines exchanging heat with the first group of refrigerant pipelines, where the second group of refrigerant pipelines includes an output pipe and an input pipe respectively connected to the outlet and inlet of the refrigerant side pipeline of the gas wave refrigerator 20; the refrigerant in the second set of refrigerant lines is used to absorb heat energy converted from the pressure energy of the natural gas.
Preferably, a low-temperature heat exchanger 8 is further disposed downstream of the first evaporator 10 and upstream of the first condenser 15 in the air flow direction, the low-temperature heat exchanger 8 further cools and dehumidifies the hot humid air by exchanging heat between low-temperature natural gas and air, and a part of the low-temperature natural gas is from the natural gas after the expander 2 applies work, and the other part of the low-temperature natural gas is from the natural gas after the air wave refrigerator 20 applies work. The low-temperature natural gas is subjected to heat exchange by the low-temperature heat exchanger 8 and then is conveyed to a low-pressure pipe network communicated with the medium-high pressure pipe network through the original pressure regulating equipment through a pipeline.
Hot and humid air absorbing sludge moisture in the sludge drying chamber 13 is sent out from the drying chamber through a first fan 17, sequentially passes through a first evaporator 10 and a low-temperature heat exchanger 8, is cooled, condenses 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 processing of the humid air comprises two procedures of temperature reduction and dehumidification and heating and temperature rise, and the air pipe of the dehumidification section is connected with a condensate pipe for discharging the condensate water generated by temperature reduction and dehumidification through the condensate pipe. The air pipe is 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 pipe in the shell realize convective heat exchange.
In the above embodiment, the natural gas driven sludge centrifugal dewatering system further includes a speed regulator 3, and the expander 2, the speed regulator 3 and the centrifugal dewatering machine 4 are in power connection in sequence. The feeding of the centrifugal dehydrator 4 is provided by a sludge clarification tank 5, and the discharging of the centrifugal dehydrator 4 is conveyed to a sludge drying chamber 13 by a screw conveyor 6. A sludge slicing machine 11 is arranged at the inlet of the sludge drying chamber 13, and a drying platform for containing sludge blocks cut by the sludge slicing machine 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 the inlet of the expansion machine 2 and the inlet of the 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 connected with a first quick shut-off valve 1 and a second quick shut-off valve 19 respectively. 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; sludge generated in a sewage treatment plant is stably precipitated in a sludge clarification tank 5 and then is conveyed to a centrifugal dehydrator 4, the sludge is dehydrated in the centrifugal dehydrator 4 and then is discharged in a mud sheet form, the water content of the sludge is about 70-80%, the sludge is conveyed to a sludge slicing machine 11 at the top of a sludge drying chamber 13 through a screw conveyor 6, the sludge is cut into bricks or thin strips by the sludge slicing machine 11, and the bricks or the thin strips automatically fall off or are conveyed to a drying table through a conveying mechanism for drying. The damp and hot air generated in the drying process is sent out from an air side outlet through a first fan 17, exchanges heat with the refrigerant side coil pipes of the first evaporator 10, the low-temperature heat exchanger 8, the first condenser 15 and the second condenser 16 in sequence through air pipes, is cooled and condensed (dehumidified) after passing through the first evaporator 10 and the low-temperature heat exchanger 8, is heated after passing through the first condenser 15 and the second condenser 16, and the heated dry air passes through a second fan 18 from an air side inlet. 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 gas pressure energy in the prior art, and the working principle is as follows: a plurality of pulse tubes are distributed in the gas wave refrigerator 20, and after high-pressure natural gas high-speed airflow 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 the shock wave compression, the temperature of the gas in the pipe is increased sharply, and the heat is transferred to the refrigerant in the second group of refrigerant pipelines through the pipe wall. The air flow sprayed into the pipe transfers partial energy to the original air in the pipe through dynamic compression and shock wave compression, so that the temperature of the air flow is reduced, and the partial low-temperature air flow can be led out from the air chamber to be used as a cold source. Therefore, the cold wave refrigerator can generate heat energy and cold energy at the same time. The heat energy is taken away by the refrigerant in the second set of refrigerant lines being circulated, 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 is low-temperature natural gas which is formed by taking natural gas after acting as a carrier, the low-temperature natural gas is output to the low-temperature heat exchanger 8 from an outlet of the gas wave refrigerator 20, a second pressure regulating valve 21 for pressure regulation is arranged on a pipeline, and after cold energy is absorbed by the low-temperature heat exchanger 8, the cold energy is regulated to a reasonable pressure range through a third pressure regulating valve 9 and finally conveyed to a low-pressure pipe network.
Meanwhile, the low-temperature natural gas (or called exhaust gas) expanded and acted in the expander 2 in the branch a is conveyed to the low-temperature heat exchanger 8 through a pipeline and pressure-regulated by the pressure regulating valve I7, is mixed with the low-temperature natural gas acted by the gas wave refrigerator 20, further absorbs the heat of the humid air after exchanging heat with the air sent in from the air pipe on 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 the heat exchangers are adjusted to adjust the heat exchange effect, so that the temperature of air in the sludge drying chamber 13 is ensured to be 70-80 ℃, the drying time of sludge in the drying chamber is 2-3 hours, and the water content of the dried sludge is 30-40%.
The gas wave refrigerator can convert the pressure energy of the pressurized gas into cold energy and heat energy as a new energy-saving technology, the lowest temperature can reach below-100 ℃, the highest temperature can reach 300 ℃, and other energy or power is not required to be added, and the gas wave refrigerator is utilized to convert the pressure energy of the high-pressure natural gas into heat energy and cold energy to meet the requirement of industrial production.
The heat pump circulation of the heat pump sludge drying system is based on mature heat pump technology, closed air circulation is adopted, and volatile matters in the drying process are closed in the drying chamber and the circulating air channel and can be collected, purified and then uniformly discharged. The temperature required by the heat pump drying technology is not as high as more than hundreds of degrees like other drying technologies, and the heat pump cycle can effectively utilize a low-temperature heat source in production and life, effectively recover heat in air, and has a good energy-saving effect, so that the energy consumption cost in the drying process is reduced.
The natural gas driven sludge centrifugal dehydration system of the embodiment utilizes pressure energy to do work, and uses the 'exhaust gas' after doing work to exchange heat with the dried air, and finally recovers the exhaust gas in 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 extra heat for the evaporator of the second heat pump cycle.
In the prior art, the natural gas conveyed by a high-pressure pipe contains great pressure energy, but the energy is usually released by regulating pressure through a restrictor when the natural gas is conveyed to a pressure regulating station, the pressure of the natural gas is reduced by several times or even dozens of times in the pressure regulating process, and the pressure energy can be converted into mechanical energy or converted into heat energy. The expansion machine, the pneumatic motor and other devices can realize the conversion of pressure energy into mechanical energy and can drive the generator to generate electricity or drive the power device to run. In consideration of the utilization mode of the natural gas pressure energy and the energy consumption characteristics of sludge dehydration and drying, the sludge dehydration and drying system driven by the natural gas pressure energy of the embodiment can recycle the energy wasted by pressure drop, and is combined with sludge dehydration and drying treatment, so that the utilization rate of energy is improved, and better energy-saving benefit is achieved.
Claims (10)
1. The utility model provides a sludge dewatering mummification system that natural gas pressure can drive 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 the pressure energy of natural gas 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 humid air;
the natural gas cold quantity separation system comprises an air wave refrigerator (20), wherein the air wave refrigerator converts the pressure energy of natural gas 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 and hot and humid air generated by sludge drying in a sludge drying chamber (13) are conveyed into a low-pressure pipe network after heat exchange.
2. The natural gas pressure energy-driven sludge dewatering and drying system as claimed in claim 1, wherein the heat pump system comprises two heat pump cycles, the first heat pump cycle comprises a loop formed by connecting a first evaporator (10), a first compressor (12), a first condenser (15) and a first throttle valve (14) in sequence; 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);
first evaporimeter (10) are used for right sludge drying room (13) exhaust hot humid air cools down the dehumidification, first condenser (15), second condenser (16) are used for heating the air after cooling the dehumidification, and the hot-air after the heating is discharged into sludge drying room (13).
3. The natural gas pressure driven sludge dewatering and drying system according to claim 2, wherein the second evaporator (22) 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, and the second group of refrigerant pipelines comprises an output pipe and an input pipe which are respectively connected with the outlet and inlet of the refrigerant side pipeline of the gas wave refrigerator (20); the refrigerant in the second group of refrigerant lines is used for absorbing heat energy converted from natural gas pressure energy.
4. The sludge dewatering and drying system driven by natural gas pressure energy according to claim 2, wherein a low-temperature heat exchanger (8) is further arranged at the downstream of the first evaporator (10) and the upstream of the first condenser (15) along the air flowing direction, the low-temperature heat exchanger (8) utilizes low-temperature natural gas to exchange heat with the air, so as to further cool and dehumidify the hot and humid air, one part of the low-temperature natural gas is from the natural gas after the expander (2) does work, and the other part of the low-temperature natural gas is from the natural gas after the air wave refrigerator (20) does work.
5. The sludge dewatering and drying system driven by natural gas pressure energy according to claim 4, wherein the low-temperature natural gas is subjected to heat exchange through the low-temperature heat exchanger (8) and then is conveyed to a low-pressure pipe network communicated with the medium-high pressure pipe network through an original pressure regulating device through a pipeline.
6. The natural gas pressure energy-driven sludge dewatering and drying system as claimed in claim 2, wherein 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 in power connection in sequence.
7. The natural gas pressure energy-driven sludge dewatering and drying system according to claim 2, wherein the feeding of the centrifugal dewatering machine (4) is provided by a sludge clarification tank (5), and the discharging of the centrifugal dewatering machine (4) is conveyed to the sludge drying chamber (13) through a screw conveyor (6).
8. The natural gas pressure energy-driven sludge dewatering and drying system as claimed in claim 7, wherein a sludge slicing machine (11) is arranged at an inlet of the sludge drying chamber (13), and a drying table for containing sludge blocks cut by the sludge slicing machine (11) is arranged in the sludge drying chamber (13).
9. The natural gas pressure energy-driven sludge dewatering and drying system as claimed in claim 2, wherein fans are respectively arranged at the air side inlet and the air outlet 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 shell of 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.
10. The sludge dewatering and drying system driven by natural gas pressure energy as claimed in claim 2, wherein the gas wave refrigerator (20) and the gas inlet of the expander (2) are respectively connected with the medium-high pressure pipe network, and a quick shut-off valve is arranged on the connecting pipeline.
Priority Applications (1)
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