Oilfield produced water multi-energy fusion air heat exchange waste heat utilization device and process method

Abstract

The present invention relates to the technical field of waste heat and waste gas utilization of oil field produced water, and in particular to a device and process for utilizing waste heat of oil field produced water by multi-energy fusion air heat exchange. The technical scheme is as follows: an air-fuel integrated heat pump is installed in the middle of the front box of a container skid, the three-phase electricity of the gas generator set is connected to the compressor through lines and a grid-connected controller, and the flue gas is connected to the flue gas heat exchanger through a pipeline; the heat generated by the gas generator set itself is connected to the economizer through a coolant to dissipate heat, and the energy storage water tank is connected to the condenser of the air source heat pump through a pipeline and a water pump; the wet curtain system is installed on the side of the container skid and is located on one side of the evaporator of the air source heat pump, and the solar water heater is installed on the top of the container skid to provide hot water for the spray system. The beneficial effect is that low-grade produced water is heat-exchanged through air, eliminating the blockage defect of produced water on the plate and shell heat exchanger, and realizing the comprehensive utilization of produced water waste heat, waste gas, solar energy and air energy.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat and waste gas utilization of oilfield produced water, and in particular to a device and a process method for utilizing waste heat of oilfield produced water through multi-energy fusion air heat exchange. Background Art

[0002] There are abundant waste heat and waste gas resources in the produced water in the oil and gas field stations. Crude oil contains about 85% of sewage that needs to be cooled and then re-injected, while the medium-temperature hot water required in production and life is mainly obtained by directly burning fossil energy, which consumes a lot of energy and has low energy efficiency. In addition, during the treatment of produced oil, associated gas is often produced, which cannot be fully utilized. The produced sewage and treated sewage in the oil field have poor water quality, many polymers, certain corrosiveness, and are low-grade heat sources, which are very difficult to use. The key to solving the problem of sewage heat exchange is the use of heat exchangers. At present, shell and tube / plate heat exchangers are more commonly used in oil fields. These two types of heat exchangers have disadvantages such as heavy weight, large volume, easy clogging and difficulty in cleaning. In the case of severe clogging, they cannot even be fully injected with low-temperature water. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned defects of the prior art and to provide an oilfield produced water multi-energy fusion air heat exchange waste heat utilization device and process method, which overcomes the serious pollution and clogging problems of shell and tube / plate heat exchangers, realizes the comprehensive waste heat and waste gas utilization of produced sewage, treated sewage and associated natural gas, and improves energy utilization.

[0004] The invention relates to an oilfield produced water multi-energy fusion air heat exchange waste heat utilization device, and its technical solution is: comprising a container skid, an external transmission pipeline system, an electric auxiliary heater, a pipeline system and a control system, wherein it also includes an air-fuel integrated heat pump, a wet curtain system, a solar water heater and a spray system.

[0005] The air-fuel integrated heat pump is installed in the middle of the front box of the container skid, and is composed of a gas generator set, an air source heat pump, a flue gas heat exchanger, an energy storage water tank, an economizer and a grid-connected controller. The three-phase electricity of the gas generator set is connected to the compressor through the line and the grid-connected controller, and the flue gas of the gas generator set is connected to the flue gas heat exchanger through a pipeline; the heat generated by the gas generator set itself is connected to the economizer through the coolant to dissipate the heat, the energy storage water tank is connected to the condenser of the air source heat pump through a pipeline and a water pump, the condenser is connected to the flue gas heat exchanger through a pipeline, and the lower end of the flue gas heat exchanger is connected to the energy storage water tank through a pipeline;

[0006] The wet curtain system is installed on the side of the container skid and is located on both sides corresponding to the evaporator of the air source heat pump. The produced water flows through the wet curtain system, and the external air passes through the wet curtain in the wet curtain system and exchanges heat with the produced water of medium and low temperature at the wet curtain. The air temperature is increased to become hot water vapor, and the hot water vapor then exchanges heat with the evaporator of the air source heat pump.

[0007] The solar water heater is installed on the top of the container skid to provide hot water for the spray system, and the spray system is connected to the top of the fin of the evaporator of the air source heat pump through a pipeline.

[0008] Preferably, the above-mentioned air source heat pump includes an evaporator, a compressor, a condenser, and an expansion valve. The output end of the compressor is connected to the tube-side inlet of the condenser through a pipeline, the tube-side outlet of the condenser is connected to the expansion valve through a pipeline, the outer end of the expansion valve is connected to the tube-side inlet of the evaporator through a pipeline, the tube-side outlet of the evaporator is connected to the tube-side inlet of the economizer through a pipeline, and the tube-side outlet of the economizer is connected to the input end of the compressor through a pipeline; the compressor compresses the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant gas, and the high-temperature and high-pressure refrigerant gas enters the condenser to condense and release heat, becoming a liquid refrigerant, and then the pressure drops instantly after passing through the expansion valve, and the refrigerant becomes a low-temperature and low-pressure gas again, and then returns to the compressor after heat exchange through the evaporator.

[0009] Preferably, the energy storage water tank comprises a box body, a water pump, a closed water exchange tank, a circulating water pump, a coil heat exchanger, and an electric auxiliary heating pipe. The box body is installed in the rear box of the container skid, the closed water exchange tank is installed in the box body, the coil heat exchanger is installed in the inner cavity of the closed water exchange tank, and the box body is filled with antifreeze or pure water, and the electric auxiliary heating pipe is installed;

[0010] The water pump is installed on the outside of the energy storage water tank to provide heat exchange flow power between the antifreeze or pure water in the energy storage water tank and the evaporator and economizer of the air source heat pump;

[0011] The circulating water pump is installed on the outside of the energy storage water tank to provide power for the water in the energy storage water tank to flow through the coil heat exchanger.

[0012] Preferably, the high-position inlet of the above-mentioned coil heat exchanger is connected to a circulating water pump, and the low-position outlet of the coil heat exchanger is connected to the inner cavity of the energy storage water tank; the upper side of the closed water exchange tank is connected to a special pump through an input pipe of the external transmission pipeline system, and an output pipe is installed on the lower side of the closed water exchange tank for connecting water or crude oil to be heated.

[0013] Preferably, the above-mentioned closed water exchange water tank adopts a cylindrical closed structure.

[0014] Preferably, the antifreeze or pure water in the energy storage water tank is driven by a water pump to flow through the condenser of the air source heat pump to exchange heat with the refrigerant, thereby increasing the water temperature in the energy storage water tank; then, the water flows through the flue gas heat exchanger to exchange heat, further increasing the temperature, and returns to the energy storage water tank.

[0015] Preferably, the wet curtain system includes a wet curtain, a sewage pump, a water inlet pipe, and a water outlet pipe. The wet curtain is the heat dissipation working component of the wet curtain system. A water inlet pipe is installed on the top of the wet curtain, which is connected to the produced water tank through the water inlet pipe to provide medium and low temperature produced water to the wet curtain. A water outlet pipe is installed at the bottom of the wet curtain, and a sewage pump is installed on the water outlet pipe. The water flowing to the bottom of the wet curtain returns to the produced water tank through the water outlet pipe.

[0016] Preferably, the wet curtain is made of corrosion-resistant plastic, rubber or wood wool.

[0017] The process for utilizing the waste heat of oilfield produced water by multi-energy fusion and air heat exchange mentioned in the present invention comprises the following steps:

[0018] 1. The produced water from the produced water tank after three-phase separation flows through the wet curtain through the water inlet pipe, and then flows back to the circulation through the sewage pump and the water outlet pipe. The wet curtain is used to increase the heat dissipation area. The external air enters the container skid under the action of the exhaust fan and flows through the wet curtain. It exchanges heat with the produced water of medium and low temperature at the wet curtain. The air temperature rises and becomes hot water vapor. The hot water vapor then flows through the fins of the evaporator of the air source heat pump. The refrigerant in the evaporator exchanges heat with the hot water vapor, and the temperature of the refrigerant rises. At the same time, the solar water heater on the upper part of the container skid generates hot water during the day. The hot water sprays water mist to the fins of the evaporator through the spray system, and the heat of the hot water is partially exchanged to the refrigerant in the evaporator.

[0019] 2. The gas generator set of the air-fuel integrated heat pump starts to generate electricity. The gas generator set outputs a three-phase 380V power supply. The air source heat pump uses a 380V power supply. The gas generator set outputs a three-phase 380V power supply, which is input to the air source heat pump through the grid-connected controller to provide part of the power.

[0020] 3. The gas generator set heats up when it is working. The heat generated by itself is dissipated through the coolant flowing through the economizer to increase the temperature of the refrigerant. The flue gas generated when the gas generator set is working flows through the flue gas heat exchanger to exchange heat with the antifreeze or pure water in the condenser, raising the water temperature in the energy storage tank. Finally, the low-temperature flue gas is discharged from the flue gas heat exchanger.

[0021] 4. Under the action of the compressor, the refrigerant of the air source heat pump enters the condenser to release heat and heat the antifreeze or pure water from the energy storage tank. Then, it is depressurized by the expansion valve and enters the evaporator. It is heat-exchanged by the hot water vapor from the wet curtain, and the refrigerant temperature rises. Then, it is heat-exchanged by the economizer to increase the refrigerant temperature, and finally returns to the compressor to circulate.

[0022] 5. Driven by the water pump, the antifreeze or pure water in the energy storage water tank flows through the condenser of the air source heat pump to exchange heat with the refrigerant. The temperature of the antifreeze or pure water rises, and then flows through the flue gas heat exchanger to exchange heat, further raising the temperature and returning to the energy storage water tank. Among them, the energy storage water tank adopts a large-volume box body to play the role of hot water energy storage;

[0023] 6. In the coil-type heat exchanger in the closed water exchange tank, the antifreeze or pure water in the energy storage tank is sent to the coil-type heat exchanger through a circulating water pump, so that the water temperature of the coil-type heat exchanger and the energy storage tank are kept the same; then the water or crude oil to be heated is driven by a special pump of the external transmission pipeline system, enters the closed water exchange tank through the input pipe, exchanges heat with the coil-type heat exchanger, and then flows out through the output pipe to achieve the heating of the water or crude oil to be heated.

[0024] Preferably, if the antifreeze or pure water in the coil heat exchanger in the energy storage water tank does not reach the set temperature, the electric auxiliary heating tube is started to heat the antifreeze or pure water to the set temperature.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] In the first stage of heat exchange of the present invention, the produced water flows through the wet curtain, and the external air flows through the wet curtain to realize non-contact air heat exchange between the produced water and the air; in the second stage, the waste gas of the gas-fired generator set generates electricity, and the electricity generated is connected to the air source heat pump through the grid-connected controller to realize the utilization of the waste gas; in the third stage, the heat generated by the gas-fired generator set itself is dissipated through the economizer, and heat is exchanged with the refrigerant pipeline of the air source heat pump in the economizer; in the fourth stage, the gas-fired generator set generates electricity through ventilation, and the generated flue gas flows through the flue gas generator for heat exchange; in the fifth stage, the water in the energy storage water tank flows through the air source heat pump heat exchanger for heat exchange, and then flows through the flue gas generator for heat exchange, and the water temperature in the energy storage water tank rises ; At the sixth stage, the water in the energy storage water tank flows through the coil heat exchanger of the closed water exchange tank, and the antifreeze or pure water in the closed water exchange tank circulates with the antifreeze or pure water in the storage tank, thereby achieving the purpose of heating the water to be heated or crude oil; at the same time, the energy storage water tank realizes hot water energy storage; At the seventh stage, the energy storage water tank is equipped with electric auxiliary heating to supplement the temperature; In short, in the heat exchange process, low-grade produced water adopts indirect heat exchange with air, and the intermediate exchange medium of the plate and shell heat exchanger is refrigerant, antifreeze or pure water, which eliminates the blockage defect of produced water on the plate and shell heat exchanger and realizes the comprehensive utilization of waste heat, waste gas, solar energy and air energy of produced water. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a principle block diagram of the present invention;

[0028] Figure 2 It is a front view of the appearance of the present invention;

[0029] Figure 3 It is a side view of the appearance of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the main viewing direction of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the present invention in a side view direction;

[0032] Figure 6 It is a schematic diagram of the arrangement of the present invention;

[0033] In the figure above: container skid 1, air-fuel integrated heat pump 2, wet curtain system 3, solar water heater 4, spray system 5, external transmission pipeline system 6, electric auxiliary heater 7, pipeline system 8, control system 9, gas generator set 2.1, air source heat pump 2.2, flue gas heat exchanger 2.3, energy storage tank 2.4, economizer 2.5, grid controller 2.6, box 2.4.1, water pump 2.4.2, closed water exchange tank 2.4.3, circulating water pump 2.4.4, coil heat exchanger 2.4.5, electric auxiliary heating pipe 2.4.6, wet curtain 3.1, sewage pump 3.2, water inlet pipe 3.3, water outlet pipe 3.4, produced water tank 3.5, input pipe 6.1, special pump 6.2, output pipe 6.3. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] Example 1, reference Figure 1-Figure 6 The present invention mentions an oilfield produced water multi-energy fusion air heat exchange waste heat utilization device, comprising a container skid 1, an external transmission pipeline system 6, an electric auxiliary heater 7, a pipeline system 8 and a control system 9, wherein it also includes an air-fuel integrated heat pump 2, a wet curtain system 3, a solar water heater 4 and a spray system 5. The air-fuel integrated heat pump 2 is installed in the middle of the front box of the container skid 1, and is composed of a gas generator set 2.1, an air source heat pump 2.2, a flue gas heat exchanger 2.3, an energy storage water tank 2.4, an economizer 2.5 and a grid-connected controller 2.6. The gas The three-phase electricity of the generator set 2.1 is connected to the compressor 2.2.2 through the line and the grid-connected controller 2.6, and the flue gas of the gas generator set 2.1 is connected to the flue gas heat exchanger 2.3 through a pipeline; the heat generated by the gas generator set 2.1 itself is connected to the economizer 2.5 through the coolant to dissipate the heat, the energy storage water tank 2.4 is connected to the condenser 2.2.3 of the air source heat pump 2.2 through a pipeline and a water pump 2.4.2, the condenser 2.2.3 is connected to the flue gas heat exchanger 2.3 through a pipeline, and the lower end of the flue gas heat exchanger 2.3 is connected to the energy storage water tank 2.4 through a pipeline;

[0036] The wet curtain system 3 is installed on the side of the container skid 1 and is located on both sides corresponding to the evaporator 2.2.1 of the air source heat pump 2.2. The produced water flows through the wet curtain system 3, and the external air passes through the wet curtain 3.1 in the wet curtain system 3, and exchanges heat with the produced water of medium and low temperature at the wet curtain 3.1. The air temperature is increased to become hot water vapor, and the hot water vapor then exchanges heat with the evaporator 2.2.1 of the air source heat pump 2.2;

[0037] The solar water heater 4 is installed on the top of the container skid 1 to provide hot water for the spray system 5, and the spray system 5 is connected to the top of the fins of the evaporator 2.2.1 of the air source heat pump 2.2 through a pipeline.

[0038] In addition, the electric auxiliary heater 7 adopts the electric auxiliary heating tube 2.4.6, and the pipeline system 8 connects the working parts of the whole machine to achieve flow coordination. The control system 9 is a conventional technology well known to technical personnel in this field, and the control system 9 controls the coordinated work of various components.

[0039] Reference Figure 1 The air source heat pump 2.2 mentioned in the present invention includes an evaporator 2.2.1, a compressor 2.2.2, a condenser 2.2.3, and an expansion valve 2.2.4. The output end of the compressor 2.2.2 is connected to the pipe inlet of the condenser 2.2.3 through a pipeline, the pipe outlet of the condenser 2.2.3 is connected to the expansion valve 2.2.4 through a pipeline, the outer end of the expansion valve 2.2.4 is connected to the pipe inlet of the evaporator 2.2.1 through a pipeline, and the pipe outlet of the evaporator 2.2.1 is connected to the expansion valve 2.2.4 through a pipeline. The pipe side inlet of economizer 2.5 and the pipe side outlet of economizer 2.5 are connected to the input end of compressor 2.2.2 through pipelines; the compressor 2.2.2 compresses the low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant gas, and the high-temperature and high-pressure refrigerant gas enters the condenser 2.2.3 to condense and release heat, turning into liquid refrigerant, and then passes through the expansion valve 2.2.4 where the pressure drops instantly, and the refrigerant turns back into low-temperature and low-pressure gas, and then returns to the compressor 2.2.2 after heat exchange in the evaporator 2.2.1.

[0040] Reference Figure 1 , Figure 4 and Figure 5 The energy storage water tank 2.4 mentioned in the present invention comprises a box body 2.4.1, a water pump 2.4.2, a closed water exchange tank 2.4.3, a circulating water pump 2.4.4, a coil heat exchanger 2.4.5, and an electric auxiliary heating pipe 2.4.6. The box body 2.4.1 is installed in the rear box of the container skid 1, the closed water exchange tank 2.4.3 is installed in the box body 2.4.1, the coil heat exchanger 2.4.5 is installed in the inner cavity of the closed water exchange tank 2.4.3, and the box body 2.4.1 is filled with antifreeze or pure water, and an electric auxiliary heating pipe 2.4.6 is installed;

[0041] The water pump 2.4.2 is installed on the outside of the energy storage water tank 2.4 to provide heat exchange flow power between the antifreeze or pure water in the energy storage water tank 2.4 and the evaporator 2.2.1 and economizer 2.5 of the air source heat pump 2.2;

[0042] The circulating water pump 2.4.4 is installed on the outside of the energy storage water tank 2.4 to provide power for the water in the energy storage water tank 2.4 to flow through the coil heat exchanger 2.4.5.

[0043] Among them, the high-level inlet of the coil-type heat exchanger 2.4.5 mentioned in the present invention is connected to the circulating water pump 2.4.4, and the low-level outlet of the coil-type heat exchanger 2.4.5 is connected to the inner cavity of the energy storage water tank 2.4; the upper side of the closed water exchange tank 2.4.3 is connected to the special pump 6.2 through the input pipe 6.1 of the external transmission pipeline system 6, and the output pipe 6.3 is installed on the lower side of the closed water exchange tank 2.4.3 for connecting the water or crude oil to be heated.

[0044] The closed water exchange tank 2.4.3 mentioned in the present invention adopts a cylindrical closed structure.

[0045] The antifreeze or pure water in the energy storage water tank 2.4 mentioned in the present invention is driven by the water pump 2.4.2, flows through the condenser 2.2.3 of the air source heat pump 2.2 to exchange heat with the refrigerant, and the water temperature in the energy storage water tank 2.4 increases; then it flows through the flue gas heat exchanger 2.3 for heat exchange, further increases the temperature, and returns to the energy storage water tank 2.4.

[0046] Reference Figure 1 and Figure 6 The wet curtain system 3 mentioned in the present invention includes a wet curtain 3.1, a sewage pump 3.2, a water inlet pipe 3.3, and a water outlet pipe 3.4. The wet curtain 3.1 is a heat dissipation working component of the wet curtain system 3. The water inlet pipe 3.3 is installed on the top of the wet curtain 3.1, and is connected to the produced water tank 3.5 through the water inlet pipe 3.3 to provide medium and low temperature produced water to the wet curtain 3.1. The water outlet pipe 3.4 is installed at the bottom of the wet curtain 3.1, and the sewage pump 3.2 is installed on the water outlet pipe 3.4. The water flowing to the bottom of the wet curtain 3.1 returns to the produced water tank 3.5 through the water outlet pipe 3.4.

[0047] The wet curtain 3.1 is made of corrosion-resistant plastic, rubber or wood wool.

[0048] The process for utilizing the waste heat of oilfield produced water by multi-energy fusion and air heat exchange mentioned in the present invention comprises the following steps:

[0049] 1. The produced water from the produced water tank 3.5 after three-phase separation flows through the water inlet pipe 3.3, passes through the wet curtain 3.1, and then flows back to the circulation through the sewage pump 3.2 and the water outlet pipe 3.4. Among them, the wet curtain 3.1 is used to increase the heat dissipation area. The external air enters the container skid 1 under the action of the exhaust fan and flows through the wet curtain 3.1. It exchanges heat with the produced water of medium and low temperature at the wet curtain 3.1. The air temperature rises and becomes hot water vapor. The hot water vapor then flows through the fins of the evaporator 2.2.1 of the air source heat pump 2.2. The refrigerant in the evaporator 2.2.1 exchanges heat with the hot water vapor, and the temperature of the refrigerant rises. At the same time, the solar water heater 4 on the upper part of the container skid 1 generates hot water during the day. The hot water sprays water mist to the fins of the evaporator 2.2.1 through the spray system 5, and the heat of the hot water is partially exchanged to the refrigerant in the evaporator 2.2.1.

[0050] 2. The gas generator set 2.1 of the air-fuel integrated heat pump 2 starts to generate electricity. The gas generator set 2.1 outputs a three-phase 380V power supply. The air source heat pump 2.2 uses a 380V power supply. The three-phase 380V power supply output by the gas generator set 2.1 is input to the air source heat pump 2.2 through the grid-connected controller 2.6 to provide part of the power.

[0051] 3. The gas generator set 2.1 heats up when it is working, and the heat generated by itself is dissipated through the coolant flowing through the economizer 2.5, thereby increasing the temperature of the refrigerant; the flue gas generated by the gas generator set 2.1 when it is working flows through the flue gas heat exchanger 2.3 to exchange heat with the antifreeze or pure water in the condenser 2.2.3, thereby increasing the water temperature in the energy storage water tank 2.4, and finally, the low-temperature flue gas is discharged from the flue gas heat exchanger 2.3;

[0052] 4. The refrigerant of the air source heat pump 2.2 enters the condenser 2.2.3 to release heat under the action of the compressor 2.2.2, and heats the antifreeze or pure water from the energy storage tank 2.4. Then, it passes through the expansion valve 2.2.4 to reduce the pressure, enters the evaporator 2.2.1, and is heat-exchanged by the hot water vapor from the wet curtain 3.1. The refrigerant temperature rises, and then passes through the economizer 2.5 to exchange heat to increase the refrigerant temperature, and finally returns to the compressor 2.2.2 to circulate.

[0053] 5. Driven by the water pump 2.4.2, the antifreeze or pure water in the energy storage water tank 2.4 flows through the condenser 2.2.3 of the air source heat pump 2.2 to exchange heat with the refrigerant. The temperature of the antifreeze or pure water rises, and then flows through the flue gas heat exchanger 2.3 to exchange heat, further raising the temperature, and returns to the energy storage water tank 2.4. Among them, the box body 2.4.1 of the energy storage water tank 2.4 adopts a large volume box body, which plays the role of hot water energy storage;

[0054] 6. In the coil heat exchanger 2.4.5 in the closed water exchange tank 2.4.3, the antifreeze or pure water in the energy storage tank 2.4 is sent to the coil heat exchanger 2.4.5 through the circulating water pump 2.4.4, so that the water temperature of the coil heat exchanger 2.4.5 and the energy storage tank 2.4 is kept the same; then the water or crude oil to be heated is driven by the special pump 6.2 of the external transmission pipeline system 6, enters the closed water exchange tank 2.4.3 through the input pipe 6.1, exchanges heat with the coil heat exchanger 2.4.5, and then flows out through the output pipe 6.3, thereby heating the water or crude oil to be heated.

[0055] If the antifreeze or pure water in the coil heat exchanger 2.4.5 in the energy storage water tank 2.4 does not reach the set temperature, the electric auxiliary heating tube 2.4.6 is started to heat the antifreeze or pure water to the set temperature.

[0056] The present invention effectively utilizes the waste heat, waste gas and air energy resources of oilfield produced water, and realizes full utilization of the waste heat and waste gas resources of produced water through multi-element fusion and multi-level.

[0057] Example 2, the present invention mentions a device for utilizing waste heat of oilfield produced water by multi-energy fusion air heat exchange, comprising a container skid 1, an external transmission pipeline system 6, an electric auxiliary heater 7, a pipeline system 8 and a control system 9, wherein it also includes an air-fuel integrated heat pump 2, a wet curtain system 3, a solar water heater 4 and a spray system 5. The air-fuel integrated heat pump 2 is installed in the middle of the front box of the container skid 1, and is composed of a gas generator set 2.1, an air source heat pump 2.2, a flue gas heat exchanger 2.3, an energy storage water tank 2.4, an economizer 2.5 and a grid-connected controller 2.6. The three-phase electricity of the gas generator set 2.1 is connected to the compressor 2.2.2 through the line and the grid controller 2.6, and the flue gas of the gas generator set 2.1 is connected to the flue gas heat exchanger 2.3 through a pipeline; the heat generated by the gas generator set 2.1 itself is connected to the economizer 2.5 through the coolant to dissipate the heat, the energy storage water tank 2.4 is connected to the condenser 2.2.3 of the air source heat pump 2.2 through the pipeline and the water pump 2.4.2, the condenser 2.2.3 is connected to the flue gas heat exchanger 2.3 through a pipeline, and the lower end of the flue gas heat exchanger 2.3 is connected to the energy storage water tank 2.4 through a pipeline;

[0058] The wet curtain system 3 is installed on the side of the container skid 1 and is located on one side of the evaporator 2.2.1 of the air source heat pump 2.2. The produced water flows through the wet curtain system 3, and the external air passes through the wet curtain 3.1 in the wet curtain system 3, and exchanges heat with the produced water of medium and low temperature at the wet curtain 3.1. The air temperature is increased to become hot water vapor, and the hot water vapor then exchanges heat with the evaporator 2.2.1 of the air source heat pump 2.2.

[0059] The solar water heater 4 is installed on the top of the container skid 1 to provide hot water for the spray system 5, and the spray system 5 is connected to the top of the fins of the evaporator 2.2.1 of the air source heat pump 2.2 through a pipeline.

[0060] The difference from Example 1 is:

[0061] According to the on-site construction conditions, the coil heat exchanger 2.4.5 of this embodiment can be directly installed in the storage tank of the water or crude oil to be heated, thereby directly heating the storage tank of the water or crude oil to be heated.

[0062] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A device for utilizing waste heat from oilfield produced water by multi-energy fusion and air heat exchange, comprising a container skid (1), an external transmission pipeline system (6), an electric auxiliary heater (7), a pipeline system (8) and a control system (9), wherein: It also includes an air-fuel integrated heat pump (2), a wet curtain system (3), a solar water heater (4) and a spray system (5). The air-fuel integrated heat pump (2) is installed in the middle of the front box of the container skid (1), and is composed of a gas generator set (2.1), an air source heat pump (2.2), a flue gas heat exchanger (2.3), an energy storage water tank (2.4), an economizer (2.5) and a grid-connected controller (2.6). The three-phase electricity of the gas generator set (2.1) is connected to the compressor (2.2.2) through the line and the grid-connected controller (2.6). The flue gas of the gas generator set (2.1) is vented to the compressor (2.2.2). The flue gas heat exchanger (2.3) is connected via a pipeline; the heat generated by the gas generator set (2.1) itself is dissipated through a coolant connected to an economizer (2.5); the energy storage water tank (2.4) is connected to a condenser (2.2.3) of an air source heat pump (2.2) via a pipeline and a water pump (2.4.2); the condenser (2.2.3) is connected to the flue gas heat exchanger (2.3) via a pipeline; and the lower end of the flue gas heat exchanger (2.3) is connected to the energy storage water tank (2.4) via a pipeline; The wet curtain system (3) is installed on the side of the container skid (1) and is located on both sides corresponding to the evaporator (2.2.1) of the air source heat pump (2.2). The produced water flows through the wet curtain system (3), and the external air passes through the wet curtain (3.1) in the wet curtain system (3) and exchanges heat with the produced water of medium and low temperature at the wet curtain (3.1). The air temperature is increased to become hot water vapor, and the hot water vapor then exchanges heat with the evaporator (2.2.1) of the air source heat pump (2.2); The solar water heater (4) is installed on the top of the container skid (1) to provide hot water for the spray system (5), and the spray system (5) is connected to the top of the fins of the evaporator (2.2.1) of the air source heat pump (2.2) through a pipeline.

2. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 1 is characterized by: The air source heat pump (2.2) comprises an evaporator (2.2.1), a compressor (2.2.2), a condenser (2.2.3), and an expansion valve (2.2.4). The output end of the compressor (2.2.2) is connected to the pipe side inlet of the condenser (2.2.3) through a pipeline, the pipe side outlet of the condenser (2.2.3) is connected to the expansion valve (2.2.4) through a pipeline, the outer end of the expansion valve (2.2.4) is connected to the pipe side inlet of the evaporator (2.2.1) through a pipeline, and the pipe side outlet of the evaporator (2.2.1) is connected to the expansion valve (2.2.4) through a pipeline. The pipe side inlet of the economizer (2.5) is connected, and the pipe side outlet of the economizer (2.5) is connected to the input end of the compressor (2.2.2) through a pipeline; the compressor (2.2.2) compresses the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant gas, and the high-temperature and high-pressure refrigerant gas enters the condenser (2.2.3) to condense and release heat, and becomes a liquid refrigerant, and then passes through the expansion valve (2.2.4) and the pressure drops instantly, and the refrigerant becomes a low-temperature and low-pressure gas again, and then passes through the evaporator (2.2.1) for heat exchange and returns to the compressor (2.2.2).

3. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 2 is characterized by: The energy storage water tank (2.4) comprises a box body (2.4.1), a water pump (2.4.2), a sealed water exchange tank (2.4.3), a circulating water pump (2.4.4), a coil-type heat exchanger (2.4.5), and an electric auxiliary heating pipe (2.4.6); the box body (2.4.1) is installed in the rear box of the container skid (1); the sealed water exchange tank (2.4.3) is installed in the box body (2.4.1); the coil-type heat exchanger (2.4.5) is installed in the inner cavity of the sealed water exchange tank (2.4.3); the box body (2.4.1) is filled with antifreeze or pure water, and is equipped with an electric auxiliary heating pipe (2.4.6); The water pump (2.4.2) is installed outside the energy storage water tank (2.4) to provide heat exchange flow power between the antifreeze or pure water in the energy storage water tank (2.4) and the evaporator (2.2.1) and economizer (2.5) of the air source heat pump (2.2); The circulating water pump (2.4.4) is installed outside the energy storage water tank (2.4) to provide power for the water in the energy storage water tank (2.4) to flow through the coil heat exchanger (2.4.5).

4. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 3 is characterized by: The high-position inlet of the coil-type heat exchanger (2.4.5) is connected to the circulating water pump (2.4.4), and the low-position outlet of the coil-type heat exchanger (2.4.5) is connected to the inner cavity of the energy storage water tank (2.4); the upper side of the closed heat exchange tank (2.4.3) is connected to the special pump (6.2) through the input pipe (6.1) of the external transmission pipeline system (6), and the output pipe (6.3) is installed on the lower side of the closed heat exchange tank (2.4.3) for connecting the water or crude oil to be heated.

5. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 4 is characterized by: The sealed water exchange tank (2.4.3) adopts a cylindrical sealed structure.

6. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 5 is characterized by: The antifreeze or pure water in the energy storage water tank (2.4) is driven by a water pump (2.4.2) to flow through the condenser (2.2.3) of the air source heat pump (2.2) to exchange heat with the refrigerant, thereby increasing the temperature of the water in the energy storage water tank (2.4); the water then flows through the flue gas heat exchanger (2.3) to exchange heat, further increasing the temperature, and returns to the energy storage water tank (2.4).

7. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 6 is characterized by: The wet curtain system (3) comprises a wet curtain (3.1), a sewage pump (3.2), a water inlet pipe (3.3), and a water outlet pipe (3.4). The wet curtain (3.1) is a heat dissipation working component of the wet curtain system (3). A water inlet pipe (3.3) is installed on the top of the wet curtain (3.1) and is connected to a produced water tank (3.5) through the water inlet pipe (3.3) for providing produced water of medium or low temperature to the wet curtain (3.1). A water outlet pipe (3.4) is installed at the bottom of the wet curtain (3.1), and a sewage pump (3.2) is installed on the water outlet pipe (3.4). Water flowing to the bottom of the wet curtain (3.1) returns to the produced water tank (3.5) through the water outlet pipe (3.4).

8. The oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 7 is characterized by: The wet curtain (3.1) is made of corrosion-resistant plastic, rubber or wood wool.

9. The process for utilizing waste heat from oilfield produced water by multi-energy fusion and air heat exchange according to claim 8 is characterized by: The process includes:

1. The produced water from the produced water tank (3.5) after three-phase separation flows through the water inlet pipe (3.3) through the wet curtain (3.1), and then flows back into circulation through the sewage pump (3.2) and the water outlet pipe (3.4), wherein the wet curtain (3.1) is used to increase the heat dissipation area. The external air enters the container skid (1) under the action of the exhaust fan and flows through the wet curtain (3.1), and exchanges heat with the produced water of medium and low temperature at the wet curtain (3.1). The air temperature rises and becomes hot water vapor. The hot water vapor then flows through the fins of the evaporator (2.2.1) of the air source heat pump (2.2). The refrigerant in the evaporator (2.2.1) exchanges heat with the hot water vapor, and the temperature of the refrigerant rises. At the same time, the solar water heater (4) on the upper part of the container skid (1) generates hot water during the day. The hot water is sprayed as water mist to the fins of the evaporator (2.2.1) through the spray system (5), and the heat of the hot water is partially exchanged with the refrigerant in the evaporator (2.2.1); 2. The gas generator set (2.1) of the air-fuel integrated heat pump (2) starts to generate electricity. The gas generator set (2.1) outputs a three-phase 380V power supply. The air source heat pump (2.2) uses a 380V power supply. The three-phase 380V power supply output by the gas generator set (2.1) is input into the air source heat pump (2.2) through the grid-connected controller (2.6) to provide part of the power.

3. The gas generator set (2.1) heats up when it is working, and the heat generated by itself is dissipated through the coolant flowing through the economizer (2.5), thereby increasing the temperature of the refrigerant; the flue gas generated when the gas generator set (2.1) is working flows through the flue gas heat exchanger (2.3) and exchanges heat with the antifreeze or pure water in the condenser (2.2.3), thereby increasing the water temperature in the energy storage water tank (2.4), and finally, the low-temperature flue gas is discharged from the flue gas heat exchanger (2.3); 4. The refrigerant of the air source heat pump (2.2) enters the condenser (2.2.3) to release heat under the action of the compressor (2.2.2), and heats the antifreeze or pure water from the energy storage tank (2.4). It then passes through the expansion valve (2.2.4) to reduce the pressure, and then enters the evaporator (2.2.1) to exchange heat with the hot water vapor from the wet curtain (3.1), raising the temperature of the refrigerant. It then passes through the economizer (2.5) to exchange heat, raising the temperature of the refrigerant, and finally returns to the compressor (2.2.2) to work in a cycle; 5. The antifreeze or purified water in the energy storage water tank (2.4) is driven by the water pump (2.4.2) to flow through the condenser (2.2.3) of the air source heat pump (2.2) to exchange heat with the refrigerant, and the temperature of the antifreeze or purified water increases. The antifreeze or purified water then flows through the flue gas heat exchanger (2.3) to exchange heat, further increasing the temperature, and returns to the energy storage water tank (2.4); wherein the box body (2.4.1) of the energy storage water tank (2.4) adopts a large volume box body, which plays the role of hot water energy storage; 6. In the coil-type heat exchanger (2.4.5) in the closed water exchange tank (2.4.3), the antifreeze or pure water in the energy storage tank (2.4) is sent to the coil-type heat exchanger (2.4.5) through the circulating water pump (2.4.4), so that the water temperature of the coil-type heat exchanger (2.4.5) and the energy storage tank (2.4) are kept the same; then, the water or crude oil to be heated is driven by the special pump (6.2) of the external transmission pipeline system (6), enters the closed water exchange tank (2.4.3) through the input pipe (6.1), exchanges heat with the coil-type heat exchanger (2.4.5), and then flows out through the output pipe (6.3), thereby heating the water or crude oil to be heated.

10. The process method of the oilfield produced water multi-energy fusion air heat exchange waste heat utilization device according to claim 9, characterized in that: If the antifreeze or pure water in the coil heat exchanger (2.4.5) in the energy storage water tank (2.4) does not reach the set temperature, the electric auxiliary heating tube (2.4.6) is started to heat the antifreeze or pure water to the set temperature.

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