High-temperature sewage waste heat recovery and reuse system

Abstract

The purpose of the present invention is to provide a high-temperature sewage waste heat recovery and reuse system. The technical solution of the present invention is: the system consists of an oil well, a dehydration heat exchanger, a heating furnace, a filter, a three-phase separator, a primary heat exchanger, a buffer tank, a water injection device, a sedimentation tank, an oil storage tank, a secondary heat exchanger, an ultra-high temperature heat pump, a tertiary heat exchanger and a controller. The system uses the existing sewage waste heat resources of the joint station as a heat source, combined with a heat pump system, to increase the temperature of the liquid crude oil from the joint station; the high-temperature sewage waste heat recovery and reuse system replaces the gas heating furnace to meet the heat demand in oil field production and life activities, and solves the environmental problems of large gas or fuel oil usage, carbon emissions and flue gas emissions. The sewage waste heat recovery and reuse system has a clear structure, and the three levels of heat exchange can improve the utilization efficiency of the boiler, reduce operating costs, reduce the emission of toxic gases, and reduce floor space. It is a fully automatic control system without the need for special personnel on duty.

Description

Technical Field

[0001] The invention relates to the field of energy and environmental protection, and in particular to a system for recovering and reusing waste heat from high-temperature sewage. Background Art

[0002] In the process of oil field production, a large amount of energy is consumed: First, in the process from oil field output to finished crude oil output system, the dehydration and external transmission of crude oil need to be heated. There are three heat demands, namely, providing hot water to the wellhead, heating the oil-water mixture, and heating the finished crude oil. It can be used for heating the dormitories, duty rooms, pump rooms, etc. of production plants and mines. At present, these heat demands are basically provided by water-jacketed heating furnaces fueled by natural gas and crude oil. The temperature range of crude oil heating is 40-70℃. This form of energy utilization is actually to obtain low-grade thermal energy by burning high-grade energy, and the energy efficiency is low. Since there is a large amount of low-temperature waste heat in the oil production system and a large amount of low-temperature heat demand is required, the previous waste heat recovery has adopted absorption heat pump waste heat recovery technology, which is used for residential heating and oil field production heat, and has achieved good economic and social benefits. However, this absorption recovery system has a large number of equipment loads, so it also leads to considerable energy consumption. If used for a long time, it will consume a lot of water and electricity energy, and the operating cost is high. As the development of oil fields enters the middle and late stages, the amount of oily wastewater in oil wells is increasing. Many heating processes require a lot of energy. my country's oil field oily wastewater has great potential for waste heat recovery. This requires in-depth research on energy conservation in oil field production, saving energy consumption in the process of gathering and transportation of crude oil, and reducing costs are issues that need to be solved. Summary of the invention

[0003] The purpose of the present invention is to provide a sewage waste heat recovery and reuse system that uses the existing sewage waste heat resources of the joint station as a heat source, combined with a heat pump system, to increase the temperature of the liquid crude oil coming from the joint station; uses high-temperature sewage waste heat recovery technology to replace the gas heating furnace to meet the heat demand in oil field production and life activities, and solves environmental protection problems such as large gas or fuel oil usage, carbon emissions and flue gas emissions.

[0004] The technical solution of the present invention is: a high-temperature sewage waste heat recovery and reuse system, which is characterized by: it is composed of an oil well, a dehydration heat exchanger, a heating furnace, a filter, a three-phase separator, a primary heat exchanger, a buffer tank, a water injection device, a sedimentation tank, an oil storage tank, a secondary heat exchanger, an ultra-high temperature heat pump, a tertiary heat exchanger and a controller. The oil well is also provided with an oil well liquid output pipe, the oil well liquid output pipe is located on one side of the oil well, one end of the oil well liquid output pipe is fixedly connected to the oil well, the other end of the oil well liquid output pipe is fixedly connected to the dehydration heat exchanger, the dehydration heat exchanger is located on one side of the oil well liquid output pipe, the dehydration heat exchanger is fixedly connected to the ground, and the dehydration heat exchanger is also provided with a heating delivery pipe, the heating delivery pipe is located on the dehydration heat exchanger. One side of the filter, one end of the heating delivery pipe is fixedly connected to the dehydration heat exchanger, the other end of the heating delivery pipe is fixedly connected to the heating furnace, the heating furnace is located on one side of the dehydration heat exchanger, the heating furnace is fixedly connected to the ground, the filter is located between the heating furnace and the three-phase separator, the filter is fixedly connected to the ground, a filter output pipe is also provided on the filter, the filter output pipe is located on one side of the filter, one end of the filter output pipe is fixedly connected to the filter, the other end of the filter output pipe is fixedly connected to the three-phase separator, the three-phase separator is located on one side of the filter, the three-phase separator is fixedly connected to the ground, the primary heat exchanger is located on one side of the three-phase separator, the primary heat exchanger is connected to the ground The first-stage heat exchanger is fixedly connected to the surface, and a first-stage heat exchange delivery pipe and a first-stage heat exchange output pipe are also provided on the first-stage heat exchanger. The first-stage heat exchange delivery pipe and the first-stage heat exchange output pipe are both located on one side of the first-stage heat exchanger. One end of the first-stage heat exchange delivery pipe is fixedly connected to the first-stage heat exchanger, and the other end of the first-stage heat exchange delivery pipe is fixedly connected to the three-phase separator. One end of the first-stage heat exchange output pipe is fixedly connected to the first-stage heat exchanger, and the other end of the first-stage heat exchange output pipe is fixedly connected to the buffer tank. The buffer tank is located on one side of the first-stage heat exchanger, and the buffer tank is fixedly connected to the ground. The buffer tank is also provided with a main delivery pipe, and the main delivery pipe is located on one side of the buffer tank. One end of the main delivery pipe is fixedly connected to the buffer tank, and the other end of the main delivery pipe It is fixedly connected to the water injection device, the water injection device is located on one side of the buffer tank, the water injection device is fixedly connected to the ground, the water injection device is also provided with a first-level external transmission pipe, the first-level external transmission pipe is located on one side of the water injection device, the first-level external transmission pipe is fixedly connected to the water injection device, the sedimentation tank is located on one side of the three-phase separator, the sedimentation tank is fixedly connected to the ground, the sedimentation tank is also provided with a three-phase separation output pipe and a sedimentation output pipe, the three-phase separation output pipe is located on one side of the sedimentation tank, one end of the three-phase separation output pipe is fixedly connected to the sedimentation tank, the other end of the three-phase separation output pipe is fixedly connected to the three-phase separator, the sedimentation output pipe is located on the other side of the sedimentation tank, and one end of the sedimentation output pipe is fixedly connected to the sedimentation tank,The other end of the sedimentation output pipe is fixedly connected to the oil storage tank, the oil storage tank is located on one side of the sedimentation tank, the oil storage tank is fixedly connected to the ground, the oil storage tank is also provided with a secondary heat exchange delivery pipe, one end of the secondary heat exchange delivery pipe is fixedly connected to the oil storage tank, the other end of the secondary heat exchange delivery pipe is fixedly connected to the secondary heat exchanger, the secondary heat exchanger is located on one side of the oil storage tank, the secondary heat exchanger is fixedly connected to the ground, the ultra-high temperature heat pump is located on one side of the secondary heat exchanger, the ultra-high temperature heat pump is fixedly connected to the ground, The ultra-high temperature heat pump is also provided with a three-stage heat exchange delivery pipe, which is located on one side of the ultra-high temperature heat pump, one end of which is fixedly connected to the ultra-high temperature heat pump, and the other end of which is fixedly connected to the three-stage heat exchanger, which is located on one side of the ultra-high temperature heat pump, and is fixedly connected to the ground. The controller is located in the plant, and the controller is fixedly connected to the dehydration heat exchanger, the heating furnace, the three-phase separator, the first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger by lines.

[0005] Furthermore, the dehydration heat exchanger, the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger are all titanium plate heat exchangers.

[0006] Furthermore, the heating furnace is a vacuum hot water boiler.

[0007] Furthermore, the heating furnace is also provided with an expansion valve and an oil well liquid preheating delivery pipe, the expansion valve is located on one side of the heating furnace, the expansion valve is fixedly connected to the heating furnace, the oil well liquid preheating delivery pipe is located on one side of the expansion valve, one end of the oil well liquid preheating delivery pipe is fixedly connected to the expansion valve, and the other end of the oil well liquid preheating delivery pipe is fixedly connected to the filter.

[0008] Furthermore, the expansion valve is a thermal expansion valve.

[0009] Furthermore, the filter is an automatic cleaning filter.

[0010] Furthermore, the secondary heat exchanger is also provided with a secondary external transfer pipe, a secondary external transfer heat pump and a secondary heat exchange output pipe, the secondary external transfer pipe is located on one side of the secondary heat exchanger, one end of the secondary external transfer pipe is fixedly connected to the secondary heat exchanger, the other end of the secondary external transfer pipe is fixedly connected to the secondary external transfer heat pump, the secondary external transfer heat pump is located on one side of the secondary heat exchanger, the secondary external transfer heat pump is fixedly connected to the ground, the secondary heat exchange output pipe is located on the other side of the secondary heat exchanger, one end of the secondary heat exchange output pipe is fixedly connected to the secondary heat exchanger, the other end of the secondary heat exchange output pipe is fixedly connected to the ultra-high temperature heat pump, and the secondary external transfer heat pump is a water source high temperature heat pump.

[0011] Furthermore, the three-stage heat exchanger is also provided with a three-stage external transfer pipe and a three-stage external transfer heat pump. The three-stage external transfer pipe is located on the other side of the three-stage heat exchanger, one end of the three-stage external transfer pipe is fixedly connected to the three-stage heat exchanger, and the other end of the three-stage external transfer pipe is fixedly connected to the three-stage external transfer heat pump. The three-stage external transfer heat pump is located on the other side of the three-stage heat exchanger, and the three-stage external transfer heat pump is fixedly connected to the ground. The three-stage external transfer heat pumps are all water source high-temperature heat pumps.

[0012] Furthermore, the controller is a programmable controller.

[0013] Furthermore, the controller is also provided with a system device, the system device is located on one side of the controller, the system device is fixedly connected to the controller, and the system device is a multi-head dual-system device.

[0014] The beneficial effects of the present invention are as follows: the system uses the existing waste heat resources of sewage in the joint station as a heat source, combined with a heat pump system, to raise the temperature of the liquid crude oil from the joint station; uses high-temperature waste heat recovery technology to replace gas heating furnaces to meet the demand for heat in oil field production and life activities, and solves environmental problems such as large gas or fuel usage, carbon emissions and flue gas emissions. The waste heat recovery and reuse system of sewage has a workflow mainly divided into three parts to complete the waste heat recovery and reuse of sewage, namely, primary heat exchange, secondary heat exchange and tertiary heat exchange. The primary heat exchange is when the inlet temperature of the crude oil is about 50°C, and then it is heated by the dehydration heat exchanger and the heating furnace, so that the outlet temperature of the crude oil is about 60°C, and then the crude oil is filtered by the filter and separated by the three-phase separator, and then the sewage separated from the sedimentation tank with a temperature of about 70°C is mixed with the sewage separated by the three-phase separator with a lower temperature of about 50°C to form 60-65°C sewage. Its advancedness lies in: when the ambient temperature is low, a new gas boiler is used to provide the heat required for three-phase separation for the incoming liquid in oil well 1. When the ambient temperature is high, the process only uses a new gas boiler to provide heat for production on the station, reducing the operating cost for the entire oil production plant; the secondary heat exchange is about 60℃ inlet temperature, and then passes through the secondary heat exchanger, its outlet temperature is about 75℃, the secondary heat exchange uses a heat pump to heat softened water to 75℃, and the softened water and crude oil exchange heat to provide the required heat energy for daily life and production; the three-pole heat exchange is about 75℃ inlet temperature, and ultra-high temperature heat pump is used to heat softened water to 90℃, and the softened water and crude oil exchange heat, and the crude oil outlet temperature is about 85-90℃, which provides the required heat energy for daily life and production. The whole system structure is clear, and the three-level heat exchange can improve the boiler utilization efficiency, reduce the operating cost, effectively increase the radiation heating area of ​​the unit, greatly reduce the emission of toxic gases, save space, reduce the floor area, and fully automatic control system, without the need for special personnel on duty. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the present invention.

[0016] Among them: 1. Oil well 2. Oil well liquid output pipe 3. Dehydration heat exchanger

[0017] 4. Heating pipe 5. Heating furnace 6. Expansion valve

[0018] 7. Oil well liquid preheating delivery pipe 8. Filter 9. Filter output pipe

[0019] 10. Three-phase separator 11. Primary heat exchange pipe 12. Primary heat exchanger

[0020] 13. Primary heat exchange output pipe 14. Buffer tank 15. Main delivery pipe

[0021] 16. Water injection device 17. Primary external transmission pipe 18. Three-phase separation output pipe

[0022] 19. Sedimentation tank 20. Sedimentation output pipe 21. Oil storage tank

[0023] 22. Secondary heat exchange pipe 23. Secondary heat exchanger 24. Secondary external pipe

[0024] 25. Secondary heat pump 26. Secondary heat exchange output pipe 27. Ultra-high temperature heat pump

[0025] 28. Three-stage heat exchange pipe 29. Three-stage heat exchanger 30. Three-stage external pipe

[0026] 31. Three-stage external heat pump 32. Controller 33. System equipment DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is briefly described below in conjunction with the accompanying drawings.

[0028] like Figure 1The high-temperature sewage waste heat recovery and reuse system shown is characterized in that it consists of an oil well 1, a dehydration heat exchanger 3, a heating furnace 5, a filter 8, a three-phase separator 10, a primary heat exchanger 12, a buffer tank 14, a water injection device 16, a sedimentation tank 19, an oil storage tank 21, a secondary heat exchanger 23, an ultra-high temperature heat pump 27, a tertiary heat exchanger 29 and a controller 32. The oil well 1 is also provided with an oil well liquid output pipe 2, the oil well liquid output pipe 2 is located on one side of the oil well 1, one end of the oil well liquid output pipe 2 is fixedly connected to the oil well 1, and the other end of the oil well liquid output pipe 2 is fixedly connected to the dehydration heat exchanger 3, the dehydration heat exchanger 3 is located on one side of the oil well liquid output pipe 2, the dehydration heat exchanger 3 is fixedly connected to the ground, and the dehydration heat exchanger 3 is The dehydration heat exchanger 3 is also provided with a heating delivery pipe 4, which is located on one side of the dehydration heat exchanger 3, one end of the heating delivery pipe 4 is fixedly connected to the dehydration heat exchanger 3, and the other end of the heating delivery pipe 4 is fixedly connected to the heating furnace 5, which is located on one side of the dehydration heat exchanger 3, and the heating furnace 5 is fixedly connected to the ground. The heating furnace 5 is also provided with an expansion valve 6 and an oil well liquid preheating delivery pipe 7, which is located on one side of the heating furnace 5, and the expansion valve 6 is fixedly connected to the heating furnace 5, and the oil well liquid preheating delivery pipe 7 is located on one side of the expansion valve 6, one end of the oil well liquid preheating delivery pipe 7 is fixedly connected to the expansion valve 6, and the other end of the oil well liquid preheating delivery pipe 7 is fixedly connected to the filter 8, and the filter 8 is fixedly connected to the filter 8. The filter 8 is located between the heating furnace 5 and the three-phase separator 10, and the filter 8 is fixedly connected to the ground. The filter 8 is also provided with a filter output pipe 9, and the filter output pipe 9 is located on one side of the filter 8. One end of the filter output pipe 9 is fixedly connected to the filter 8, and the other end of the filter output pipe 9 is fixedly connected to the three-phase separator 10. The three-phase separator 10 is located on one side of the filter 8, and the three-phase separator 10 is fixedly connected to the ground. The first-stage heat exchanger 12 is located on one side of the three-phase separator 10, and the first-stage heat exchanger 12 is fixedly connected to the ground. The first-stage heat exchanger 12 is also provided with a first-stage heat exchange delivery pipe 11 and a first-stage heat exchange output pipe 13. The first-stage heat exchange delivery pipe 11 and the first-stage heat exchange output The pipes 13 are all located on one side of the primary heat exchanger 12, one end of the primary heat exchange delivery pipe 11 is fixedly connected to the primary heat exchanger 12, the other end of the primary heat exchange delivery pipe 11 is fixedly connected to the three-phase separator 10, one end of the primary heat exchange output pipe 13 is fixedly connected to the primary heat exchanger 12, the other end of the primary heat exchange output pipe 13 is fixedly connected to the buffer tank 14, the buffer tank 14 is located on one side of the primary heat exchanger 12, the buffer tank 14 is fixedly connected to the ground, a main delivery pipe 15 is also provided on the buffer tank 14, the main delivery pipe 15 is located on one side of the buffer tank 14, one end of the main delivery pipe 15 is fixedly connected to the buffer tank 14, and the other end of the main delivery pipe 15 is fixedly connected to the water injection device 16,The water injection device 16 is located at one side of the buffer tank 14, and the water injection device 16 is fixedly connected to the ground. The water injection device 16 is also provided with a first-level external transmission pipe 17, and the first-level external transmission pipe 17 is located at one side of the water injection device 16, and the first-level external transmission pipe 17 is fixedly connected to the water injection device 16. The settling tank 19 is located at one side of the three-phase separator 10, and the settling tank 19 is fixedly connected to the ground. The settling tank 19 is also provided with a three-phase separation output pipe 18 and a settling output pipe 20, and the three-phase separation output pipe 18 is located at one side of the settling tank 19, and one end of the three-phase separation output pipe 18 is fixedly connected to the settling tank 19, and the other end of the three-phase separation output pipe 18 is fixedly connected to the three-phase separator 10. The pipe 20 is located at the other side of the sedimentation tank 19, one end of the sedimentation output pipe 20 is fixedly connected to the sedimentation tank 19, and the other end of the sedimentation output pipe 20 is fixedly connected to the oil storage tank 21, the oil storage tank 21 is located at one side of the sedimentation tank 19, the oil storage tank 21 is fixedly connected to the ground, and the oil storage tank 21 is also provided with a secondary heat exchange delivery pipe 22, one end of the secondary heat exchange delivery pipe 22 is fixedly connected to the oil storage tank 21, and the other end of the secondary heat exchange delivery pipe 22 is fixedly connected to the secondary heat exchanger 23, the secondary heat exchanger 23 is located at one side of the oil storage tank 21, the secondary heat exchanger 23 is fixedly connected to the ground, and the secondary heat exchanger 23 is also provided with a secondary external delivery pipe 24, a secondary external delivery heat pump 25 and a secondary heat exchange output The secondary external transmission pipe 26 is located at one side of the secondary heat exchanger 23, one end of the secondary external transmission pipe 24 is fixedly connected to the secondary heat exchanger 23, the other end of the secondary external transmission pipe 24 is fixedly connected to the secondary external transmission heat pump 25, the secondary external transmission heat pump 25 is located at one side of the secondary heat exchanger 23, the secondary external transmission heat pump 25 is fixedly connected to the ground, the secondary heat exchange output pipe 26 is located at the other side of the secondary heat exchanger 23, one end of the secondary heat exchange output pipe 26 is fixedly connected to the secondary heat exchanger 23, the other end of the secondary heat exchange output pipe 26 is fixedly connected to the ultra-high temperature heat pump 27, the ultra-high temperature heat pump 27 is located at one side of the secondary heat exchanger 23, the ultra-high temperature heat pump 27 is fixedly connected to the ground ... The high-temperature heat pump 27 is also provided with a three-stage heat exchange delivery pipe 28, which is located on one side of the ultra-high temperature heat pump 27, and one end of the three-stage heat exchange delivery pipe 28 is fixedly connected to the ultra-high temperature heat pump 27, and the other end of the three-stage heat exchange delivery pipe 28 is fixedly connected to the three-stage heat exchanger 29, which is located on one side of the ultra-high temperature heat pump 27, and the three-stage heat exchanger 29 is fixedly connected to the ground. The three-stage heat exchanger 29 is also provided with a three-stage external transmission pipe 30 and a three-stage external transmission heat pump 31, which is located on the other side of the three-stage heat exchanger 29, and one end of the three-stage external transmission pipe 30 is fixedly connected to the three-stage heat exchanger 29, and the other end of the three-stage external transmission pipe 30 is fixedly connected to the three-stage external transmission heat pump 31.The three-stage external heat pump 31 is located on the other side of the three-stage heat exchanger 29. The three-stage external heat pump 31 is fixedly connected to the ground. The controller 32 is located in the factory. The controller 32 is fixedly connected to the dehydration heat exchanger 3, the heating furnace 5, the three-phase separator 10, the first-stage heat exchanger 12, the second-stage heat exchanger 23 and the third-stage heat exchanger 29 by lines. The controller 32 is also provided with a system device 33. The system device 33 is located on one side of the controller 32, and the system device 33 is fixedly connected to the controller 32. The dehydration heat exchanger 3, the first-stage heat exchanger 12, the second-stage heat exchanger 23 and the third-stage heat exchanger 29 are all titanium plate heat exchangers. The heating furnace 5 is a vacuum hot water boiler. The expansion valve 6 is a thermal expansion valve. The filter 8 is an automatic cleaning filter. The two-stage external heat pump 25 and the three-stage external heat pump 31 are both water source high-temperature heat pumps. The controller 32 is a programmable controller. The system device 33 is a multi-head dual-system device. ,

[0029] Working mode: The system is mainly composed of an oil well 1, a dehydration heat exchanger 3, a heating furnace 5, a filter 8, a three-phase separator 10, a primary heat exchanger 12, a buffer tank 14, a water injection device 16, a sedimentation tank 19, an oil storage tank 21, a secondary heat exchanger 23, an ultra-high temperature heat pump 27, a tertiary heat exchanger 29 and a controller 32. The working process is mainly divided into three parts to complete the recovery and reuse of waste heat from sewage, namely, primary heat exchange, secondary heat exchange and tertiary heat exchange.

[0030] First, the first-stage heat exchange is to make the crude oil inlet temperature about 50°C, and then after the dehydration heat exchanger 3 and the heating furnace 5 are heated, the crude oil outlet temperature is about 60°C, and the heat exchange pipe of the dehydration heat exchanger 3 adopts corrosion-resistant, high heat transfer efficiency corrugated heat exchange pipe, which solves the problem of structural blockage and corrosion, and has high efficiency. Then, the crude oil is filtered by the filter 8 and separated by the three-phase separator 10, and then the sewage with a temperature of about 70°C separated from the sedimentation tank 19 is mixed with the sewage with a lower temperature of about 50°C separated by the three-phase separator 10 to form 60-65°C sewage. It exchanges heat with the crude oil produced in the oil well 1, enters the buffer tank 14 through the primary heat exchanger 12, and then uses the water injection device 16 to add sewage to achieve the heat energy required for daily and industrial use. The temperature is controlled at around 40°C. Its advancement lies in: when the ambient temperature is low, a new gas boiler is used to provide the heat required for three-phase separation for the incoming liquid in the oil well 1. When the ambient temperature is high, the process only uses the new gas boiler to provide heat for the station production. The crude oil enters the dehydration heat exchanger 3 from the oil well 1 through the oil well incoming liquid output pipe 2. In this way, only natural gas and electricity can be used to meet the production needs of the station, and the daily production and operation losses can be reduced, thereby reducing the operating costs of the entire oil production plant. The heating furnace 5 is a vacuum hot water boiler, which can operate at low temperature under negative pressure, is safe and reliable, has a more compact structure, and has the advantages of extremely low noise and exhaust emissions; the expansion valve 6 adopts a thermal expansion valve, which can automatically adjust the refrigerator according to the cold water temperature and the operating status of the unit; the filter 8 adopts an automatic cleaning filter, which solves the problems of oil film on the mesh wall causing blockage of the mesh when filtering oily liquids and high molecular polymers in the oily wastewater.

[0031] Secondly, the secondary heat exchange is the crude oil after filtration by the filter 8 and separation by the three-phase separator 10, and then passes through the settling tank 19, and finally the crude oil output by the oil storage tank 21, its inlet temperature is about 60°C, and then passes through the secondary heat exchanger 23, its outlet temperature is about 75°C. The secondary heat exchange uses a heat pump to heat the softened water to 75°C, and the softened water exchanges heat with the crude oil, and is output through the secondary external heat pump 25 on one side of the secondary heat exchanger 23 to provide the required heat energy for daily life and production.

[0032] Finally, the three-stage heat exchange is to heat the crude oil inlet temperature from the secondary heat exchanger 23 to about 75°C, and use the ultra-high temperature heat pump 27 to heat the softened water to 90°C. The softened water exchanges heat with the crude oil and then passes through the tertiary heat exchanger 29. The crude oil outlet temperature is about 85-90°C, and is output through the tertiary external heat pump 31 on one side of the tertiary heat exchanger 29 to provide the required heat energy for daily life and production.

[0033] In addition, the dehydration heat exchanger 3, the primary heat exchanger 12, the secondary heat exchanger 23 and the tertiary heat exchanger 29 all use titanium plate heat exchangers, which have better corrosion resistance in wet chlorine than other commonly used metals. This is because chlorine has a strong oxidizing effect, and the titanium plate can be in a stable passive state in wet chlorine, so it will not be corroded. When the heat exchanger is equipped with fluororubber as a sealing rubber pad, compared with ordinary EPDM and NBR, fluororubber has excellent chemical resistance, oil resistance and temperature resistance, and the long-term use temperature is above 250°C, which is about 100°C higher than ordinary rubber strips. Therefore, the heat exchanger can also be used in high-temperature acidic and alkaline environments. The secondary external heat pump 25 and the tertiary external heat pump 31 both use water source high temperature heat pumps. They can be connected in parallel to the subcooler and the oil cooler through the water source pipeline, and then connected in series with the evaporator, so that the water source is used as the refrigerant to achieve the large temperature difference between the condenser and the evaporator. The sensible heat of the supercooling of the working medium and the sensible heat of the exhaust oil cooling are fully recovered to greatly increase the temperature of the water source entering the evaporator, increase the evaporation temperature and evaporation pressure of the heat pump cycle, reduce the compression ratio of the heat pump, and at the same time improve the isentropic efficiency and volumetric efficiency of the compressor, so as to achieve efficient operation of the heat pump, reduce the exhaust temperature of the compressor, avoid rotor expansion and locking, complete the deep subcooling of the working medium, ensure the long-term reliability of the expansion valve and other liquid pipe fittings, and achieve efficient operation. The controller 32 adopts a programmable controller with fault self-diagnosis, alarm and protection functions, can realize the operating parameters, and can also remotely control the loading and unloading of the compressor and the heating amount of the unit. The system equipment 33 is a multi-head dual-system device, which can automatically adjust the number of operating compressors according to load changes. The whole system has a clear structure. The three-level heat exchange can improve the utilization efficiency of the boiler, reduce the operation cost, effectively increase the radiation heating area of ​​the unit, greatly reduce the emission of toxic gases, save space, reduce the floor space, and adopt the fully automatic control system without the need for special personnel on duty. It uses the existing sewage waste heat resources of the joint station as the heat source, combined with the heat pump system to increase the temperature of the liquid crude oil coming from the joint station; the high-temperature sewage waste heat recovery technology is used to replace the gas heating furnace to meet the heat demand of oil field production and life activities, and solve the environmental problems such as large gas or fuel consumption, carbon emissions and flue gas emissions. The sewage waste heat recovery and reuse system.

[0034] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. High-temperature sewage waste heat recovery and reuse system, characterized by: The invention is composed of an oil well, a dehydration heat exchanger, a heating furnace, a filter, a three-phase separator, a primary heat exchanger, a buffer tank, a water injection device, a sedimentation tank, an oil storage tank, a secondary heat exchanger, an ultra-high temperature heat pump, a tertiary heat exchanger and a controller. The oil well is also provided with an oil well liquid output pipe, the oil well liquid output pipe is located on one side of the oil well, one end of the oil well liquid output pipe is fixedly connected to the oil well, the other end of the oil well liquid output pipe is fixedly connected to the dehydration heat exchanger, the dehydration heat exchanger is located on one side of the oil well liquid output pipe, the dehydration heat exchanger is fixedly connected to the ground, the dehydration heat exchanger is also provided with a heating delivery pipe, the heating delivery pipe is located on one side of the dehydration heat exchanger, one end of the heating delivery pipe is fixedly connected to the dehydration heat exchanger, and the heating delivery pipe is provided on the ground. The other end of the delivery pipe is fixedly connected to the heating furnace, which is located on one side of the dehydration heat exchanger, and the heating furnace is fixedly connected to the ground. The filter is located between the heating furnace and the three-phase separator, and the filter is fixedly connected to the ground. The filter is also provided with a filter output pipe, and the filter output pipe is located on one side of the filter. One end of the filter output pipe is fixedly connected to the filter, and the other end of the filter output pipe is fixedly connected to the three-phase separator, which is located on one side of the filter, and the three-phase separator is fixedly connected to the ground. The first-stage heat exchanger is located on one side of the three-phase separator, and the first-stage heat exchanger is fixedly connected to the ground. The first-stage heat exchanger is also provided with a first-stage heat exchange delivery pipe and a first-stage heat exchange output The first-stage heat exchange delivery pipe and the first-stage heat exchange output pipe are both located at one side of the first-stage heat exchanger, one end of the first-stage heat exchange delivery pipe is fixedly connected to the first-stage heat exchanger, the other end of the first-stage heat exchange delivery pipe is fixedly connected to the three-phase separator, one end of the first-stage heat exchange output pipe is fixedly connected to the first-stage heat exchanger, the other end of the first-stage heat exchange output pipe is fixedly connected to the buffer tank, the buffer tank is located at one side of the first-stage heat exchanger, the buffer tank is fixedly connected to the ground, a main delivery pipe is also provided on the buffer tank, the main delivery pipe is located at one side of the buffer tank, one end of the main delivery pipe is fixedly connected to the buffer tank, the other end of the main delivery pipe is fixedly connected to the water injection device, the water injection device is located at one side of the buffer tank, the water injection device is fixedly connected to the ground, and the water injection device is fixedly connected to the ground. The ground is fixedly connected, the water injection device is also provided with a first-level external transmission pipe, the first-level external transmission pipe is located on one side of the water injection device, the first-level external transmission pipe is fixedly connected to the water injection device, the sedimentation tank is located on one side of the three-phase separator, the sedimentation tank is fixedly connected to the ground, the sedimentation tank is also provided with a three-phase separation output pipe and a sedimentation output pipe, the three-phase separation output pipe is located on one side of the sedimentation tank, one end of the three-phase separation output pipe is fixedly connected to the sedimentation tank, the other end of the three-phase separation output pipe is fixedly connected to the three-phase separator, the sedimentation output pipe is located on the other side of the sedimentation tank, one end of the sedimentation output pipe is fixedly connected to the sedimentation tank, the other end of the sedimentation output pipe is fixedly connected to the oil storage tank, the oil storage tank is located on one side of the sedimentation tank,The oil storage tank is fixedly connected to the ground, and the oil storage tank is also provided with a secondary heat exchange delivery pipe, one end of the secondary heat exchange delivery pipe is fixedly connected to the oil storage tank, and the other end of the secondary heat exchange delivery pipe is fixedly connected to the secondary heat exchanger, the secondary heat exchanger is located at one side of the oil storage tank, the secondary heat exchanger is fixedly connected to the ground, the ultra-high temperature heat pump is located at one side of the secondary heat exchanger, the ultra-high temperature heat pump is fixedly connected to the ground, and the ultra-high temperature heat pump is also provided with a tertiary heat exchange delivery pipe, the tertiary heat exchange delivery pipe is located at one side of the ultra-high temperature heat pump, one end of the tertiary heat exchange delivery pipe is fixedly connected to the ultra-high temperature heat pump, and the other end of the tertiary heat exchange delivery pipe is fixedly connected to the tertiary heat exchanger, the tertiary heat exchanger is located at one side of the ultra-high temperature heat pump, and the tertiary heat exchanger is fixedly connected to the ground, the controller is located in the factory building, and the controller is fixedly connected to the dehydration heat exchanger, the heating furnace, the three-phase separator, the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger by lines;, The dehydration heat exchanger, the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger are all titanium plate heat exchangers; The heating furnace is a vacuum hot water boiler.

2. The high-temperature sewage waste heat recovery and reuse system according to claim 1 is characterized in that: The heating furnace is also provided with an expansion valve and a preheating and delivery pipe for liquid from an oil well. The expansion valve is located on one side of the heating furnace and is fixedly connected to the heating furnace. The preheating and delivery pipe for liquid from an oil well is located on one side of the expansion valve. One end of the preheating and delivery pipe for liquid from an oil well is fixedly connected to the expansion valve, and the other end of the preheating and delivery pipe for liquid from an oil well is fixedly connected to the filter.

3. The high-temperature sewage waste heat recovery and reuse system according to claim 2 is characterized in that: The expansion valve is a thermal expansion valve.

4. The high-temperature sewage waste heat recovery and reuse system according to claim 1 is characterized in that: The filter is an automatic cleaning filter.

5. The high-temperature sewage waste heat recovery and reuse system according to claim 1 is characterized in that: The secondary heat exchanger is also provided with a secondary external transmission pipe, a secondary external transmission heat pump and a secondary heat exchange output pipe. The secondary external transmission pipe is located on one side of the secondary heat exchanger, one end of the secondary external transmission pipe is fixedly connected to the secondary heat exchanger, and the other end of the secondary external transmission pipe is fixedly connected to the secondary external transmission heat pump. The secondary external transmission heat pump is located on one side of the secondary heat exchanger, and the secondary external transmission heat pump is fixedly connected to the ground. The secondary heat exchange output pipe is located on the other side of the secondary heat exchanger, one end of the secondary heat exchange output pipe is fixedly connected to the secondary heat exchanger, and the other end of the secondary heat exchange output pipe is fixedly connected to the ultra-high temperature heat pump. The secondary external transmission heat pump is a water source high temperature heat pump.

6. The high-temperature sewage waste heat recovery and reuse system according to claim 1 is characterized in that: The three-stage heat exchanger is also provided with a three-stage external transmission pipe and a three-stage external transmission heat pump. The three-stage external transmission pipe is located on the other side of the three-stage heat exchanger. One end of the three-stage external transmission pipe is fixedly connected to the three-stage heat exchanger. The other end of the three-stage external transmission pipe is fixedly connected to the three-stage external transmission heat pump. The three-stage external transmission heat pump is located on the other side of the three-stage heat exchanger. The three-stage external transmission heat pump is fixedly connected to the ground. The three-stage external transmission heat pumps are all water source high-temperature heat pumps.

7. The high-temperature sewage waste heat recovery and reuse system according to claim 1 is characterized in that: The controller is a programmable controller.

8. The high-temperature sewage waste heat recovery and reuse system according to claim 1 is characterized by: The controller is also provided with a system device, which is located at one side of the controller. The system device is fixedly connected to the controller, and the system device is a multi-head dual-system device.

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