Cold and heat complementary utilization system for oil gas treatment station
By designing a complementary heat and heat utilization system in the oil and gas treatment station, and using technologies such as industrial control machines and pneumatic membrane regulating valves, the complementary heat and cold energy of the circulating water system and the heat tracing water system is achieved, solving the problem of unused heat and energy. The problem of high consumption significantly saves energy consumption and reduces pollution.
Patent Information
- Application Number
- CN202310786622.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-29
- Publication Date
- 2024-12-31
AI Technical Summary
The circulating water system and heat-tracing water system of the existing oil and gas treatment stations are independent of each other, resulting in the ineffective use of heat, resulting in waste of heat energy and environmental pollution, and a large amount of natural gas is needed for heating, which increases energy consumption and pollution.
A complementary heat and heat utilization system for oil and gas treatment stations was designed. Through industrial control machines, liquid level meters and pneumatic membrane regulating valves, the waste heat of the circulating water system is supplied to the heat-tracing water system, and the residual heat of the heat-tracing water system is supplied to the heat-tracing water system. The cold supply circulating water system achieves complementary heat and cooling, reduces fuel consumption of heating furnaces, and reduces air heat dissipation and pollution.
The heat and cooling capacity of the circulating water system and the heat-tracing water system is achieved, saving the heating furnace fuel, reducing energy consumption and pollution, and improving the energy efficiency and environmental performance of the system.
Smart Images
Figure CN119223030A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of oil and gas storage and transportation, and in particular relates to a cold and heat complementary utilization system for an oil and gas processing station. Background Art
[0002] At present, in the oil and gas processing station of the oil field, the processes of the circulating water system for natural gas purification and the hot water system for crude oil gathering and transportation are independent of each other and form their own systems. Among them, the water circulation system for natural gas purification is used for heat dissipation and cooling, that is, the heat of each compressor itself, especially the heat of the outlet gas, the heat of the molecular sieve dehydration regeneration gas, the heat released by the ammonia from gas to liquid, etc. are transferred to the circulating water through the heat exchanger, and then the circulating water flows into the cooling tower, where the air fan is used to cool the circulating water, and then enters the circulating water tank, and then the circulating water pump is pressurized for the next cycle. Specifically, the circulating water in the circulating water tank is transferred to the water circulation system through the circulating water pump, including the first and second heat exchangers of the compressor, the main heat exchanger of the compressor, the ammonia condensation heat exchanger, the regeneration heat exchanger, the expander turbine oil heat exchanger and other heat exchangers for heat exchange. After the heat exchange, the temperature of the circulating water increases, and the circulating water with the increased temperature is gathered together and enters the cooling tower for cooling, and then returns to the circulating water tank after cooling. Since the circulating water will be lost due to evaporation in this process, it is necessary to replenish the circulating water tank as appropriate.
[0003] In the circulating water system, the compressors and booster heat exchangers at all levels and regeneration heat exchangers used for natural gas processing, and the condensing heat exchangers of the ammonia compressor need to be cooled by circulating water, and the return water temperature of the circulating water is usually between 55-65°C.
[0004] The hot water system for crude oil gathering and transportation is used to heat the well source water as hot water for heating the oil and gas gathering and transportation pipelines. In order to heat each oil and gas pipeline, the hot water is heated by a heating furnace, and then heated by the heating water distribution room to the oil and gas gathering and transportation pipeline to prevent the crude oil from stagnating and solidifying in the oil and gas gathering and transportation pipeline. Then, it flows into the return water tank of the hot water through the return water pipe, thus completing a heating cycle and entering the next cycle. Specifically, the low-temperature hot water in the return water tank is pressurized by a hot water pump, and then heated to 70-75℃ by a hot water heating furnace to become high-temperature hot water. After that, the oil and gas gathering and transportation pipelines of each oil well and multiple oil storage tanks are heated, and the living facilities are heated in winter. Then, it flows into the return water tank through the return water pipe, and the cycle is repeated. During this process, a part of cold water needs to be added to the return water tank to supplement the water consumption.
[0005] The existing technology discloses a "flue gas waste heat recovery system". It connects the flue gas outlet of the heating furnace to an air heat exchanger to recover the heat of the flue gas. The primary heat exchanger and the secondary heat exchanger of the system recover the waste heat twice from the flue gas, and finally reduce the temperature of the flue gas to 60°C or below, and then use the recovered heat for the next operation cycle.
[0006] However, the above system has the following problems:
[0007] 1. The cooling and cooling facilities for circulating water are to lower the water temperature through three cooling towers and use air fans to cool and dissipate heat, so that part of the water is discharged into the air, and water needs to be replenished regularly.
[0008] 2. The circulating water first absorbs heat from natural gas facilities such as heat exchangers and condensers, and then dissipates heat and cools down in the cooling tower. Such repeated circulation will produce saprophytes, which are easy to corrode the water tanks of the circulating water heat exchangers and condensers.
[0009] 3. During the repeated circulation of circulating water, the temperature of the natural gas purification facility is reduced, but the heat energy loss will cause the air environment temperature to rise.
[0010] 4. The heating of oil and gas pipelines by the hot water system is a heat transfer and heat release process, which is continuously heated by the heating furnace. The heating furnace consumes a large amount of natural gas as fuel for heating.
[0011] 5. The repeated cycles of hot water heating, heat transfer, reheating and reheat transfer also cause part of the circulating water to be lost into the air. Cold water needs to be replenished regularly, so a certain amount of natural gas needs to be continuously consumed as fuel to increase the temperature.
[0012] 6. The hot water needs to be heated to above 75 degrees for heating, heat transfer and reheating and needs to be circulated repeatedly, which can easily cause scaling of the hot water pipes and other facilities, so it is necessary to invest in anti-scaling costs.
[0013] 7. Although a certain amount of flue gas heat generated during the heating process of the heating furnace can be recovered, the recovered energy is relatively small. The main heat cost in the hot water circulation is still in the heating of the water source well water, and the waste of cold energy has not been effectively solved. At the same time, the natural gas purification facility uses a cooling tower to cool down the circulating water during the circulation process, which will cause heat energy waste, CO2 emissions and air pollution. In short, current technology cannot solve this common problem in oil and gas processing stations. Summary of the invention
[0014] In order to solve the above problems, the object of the present invention is to provide a cold and heat complementary utilization system for an oil and gas processing station.
[0015] In order to achieve the above-mentioned purpose, the cold and heat complementary utilization system of the oil and gas processing station provided by the present invention comprises a dedicated heating pipeline, a cooling tower, a circulating pipeline, a circulating water tank, a dedicated cooling pipeline, a pneumatic thin film regulating valve, a differential pressure level gauge, a water temperature transmitter, a drainage pipeline, a circulating water pump, a return pipeline, a controller and an industrial computer; wherein, the two ends of the dedicated heating pipeline are respectively connected to the circulating water outlet of each heat exchanger in the circulating water system of natural gas purification and the upper part of the cooling tower; the two ends of the circulating pipeline are respectively connected to the lower part of the cooling tower and the upper part of the circulating water tank; the two ends of the dedicated cooling ... tower; the They are respectively connected to the drainage outlet of the well water and the lower part of the circulating water tank; the pneumatic diaphragm regulating valve is installed on the special cooling pipeline; the lower parts of the cooling tower and the circulating water tank are both installed with differential pressure level gauges; the heating pipeline and the circulating pipeline are both installed with water temperature transmitters; the two ends of the drainage pipeline are respectively connected to the lower part of the circulating water tank and the water inlet of the circulating water pump; the two ends of the return pipeline are respectively connected to the water outlet of the circulating water pump and the circulating water inlet of each heat exchanger; the industrial computer is electrically connected to the differential pressure level gauge, the water temperature transmitter and the pneumatic diaphragm regulating valve through the controller.
[0016] The heat exchangers include a natural gas compressor heat exchanger, an ammonia condensation heat exchanger, an air compressor heat exchanger and a molecular sieve regeneration heat exchanger.
[0017] The cold pipeline is made of DN60 pipeline.
[0018] The controller and the industrial computer are arranged in the central control room of the oil field.
[0019] The refrigeration pipeline is also provided with a bypass valve connected in parallel with the pneumatic diaphragm regulating valve.
[0020] The cold and heat complementary utilization system of the oil and gas processing station provided by the present invention has the following beneficial effects:
[0021] It solves the problems of the traditional circulating water system and the hot water system being independent of each other, each forming a system with obvious side effects, the heat of the circulating water system not being utilized and discharged wastefully, the cold capacity of the water source well in the hot water system not being utilized and energy being consumed for heating, etc. By means of industrial computers, liquid level gauges, pneumatic diaphragm regulating valves, etc., the waste heat of the circulating water system is quantitatively supplied to the hot water system; and the waste cold of the hot water system is quantitatively supplied to the circulating water system, so that the heat and cold of the circulating water system and the hot water system complement each other, saving the corresponding heating furnace fuel and achieving energy conservation and consumption reduction; it also makes part of the circulating water no longer need to dissipate heat and cool down in the air of the cooling water tower, so as to achieve energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of the cold and heat complementary utilization system for the oil and gas processing station provided by the present invention. DETAILED DESCRIPTION
[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
[0024] like Figure 1 As shown, the cold and heat complementary utilization system of the oil and gas processing station provided by the present invention comprises a dedicated heating pipeline 1, a cooling tower 2, a circulating pipeline 3, a circulating water tank 4, a dedicated cooling pipeline 5, a pneumatic thin film regulating valve 6, a differential pressure level gauge 7, a water temperature transmitter 8, a drainage pipeline 9, a circulating water pump 10, a return water pipeline 11, a controller and an industrial computer; wherein, the two ends of the dedicated heating pipeline 1 are respectively connected to the circulating water outlets of each heat exchanger in the circulating water system of natural gas purification and the upper part of the cooling tower 2; the two ends of the circulating pipeline 3 are respectively connected to the lower part of the cooling tower 2 and the upper part of the circulating water tank 4; the two ends of the dedicated cooling pipeline 5 ... circulating water outlets of each heat exchanger in the circulating water system of natural gas purification and the upper part of the cooling tower 2 It is connected to the drainage outlet of the well water and the lower part of the circulating water tank 4; the pneumatic diaphragm regulating valve 6 is installed on the special cooling pipeline 5; the lower parts of the cooling tower 2 and the circulating water tank 4 are both installed with a differential pressure level gauge 7; the special heating pipeline 1 and the circulating pipeline 3 are both installed with a water temperature transmitter 8; the two ends of the drainage pipeline 9 are respectively connected to the lower part of the circulating water tank 4 and the water inlet of the circulating water pump 10; the two ends of the return water pipeline 11 are respectively connected to the water outlet of the circulating water pump 10 and the circulating water inlet of each heat exchanger; the industrial computer is electrically connected to the differential pressure level gauge 7, the water temperature transmitter 8 and the pneumatic diaphragm regulating valve 6 through the controller.
[0025] The heat exchangers include a natural gas compressor heat exchanger, an ammonia condensation heat exchanger, an air compressor heat exchanger and a molecular sieve regeneration heat exchanger.
[0026] The cold pipeline 5 is made of DN60 pipeline.
[0027] The controller and the industrial computer are arranged in the central control room of the oil field.
[0028] The refrigeration pipeline 5 is also provided with a bypass valve 12 connected in parallel with the pneumatic diaphragm regulating valve 6.
[0029] The working principle of the cold and heat complementary utilization system of the oil and gas processing station provided by the present invention is described as follows:
[0030] The hot circulating water from the outlets of the heat exchangers including the natural gas compressor heat exchanger, the ammonia condensing heat exchanger, the air compressor heat exchanger and the molecular sieve regeneration heat exchanger flows into the cooling tower 2 through the dedicated heating pipeline 1 for cooling, and then flows into the circulating water tank 4 through the circulating pipeline 3 for concentration, after which the circulating water pump 10 draws the cooled circulating water in the circulating water tank 4 through the drainage pipeline 9 for pressurization, and then delivers it to the inlet of each heat exchanger through the return pipeline 11, thus completing a circulation process. In the above circulation process, under the control of the industrial computer, the water temperature transmitter 8 is used to detect the water temperature in the special heating pipeline 1 and the circulation pipeline 3 in real time according to the set parameters and transmit it to the controller in the form of electrical signals; at the same time, the differential pressure level meter 7 is used to detect the liquid level in the cooling tower 2 and the circulation water tank 4 in real time according to the set parameters and transmit it to the controller in the form of electrical signals; after receiving the above electrical signals, the controller filters out the interference signals therein and pre-processes them, and adjusts the set parameters according to the detection data, and then transmits them to the industrial computer; after receiving the pre-processed electrical signals, the industrial computer first amplifies and converts them, and then performs integral and differential calculations to determine the opening size and speed of the pneumatic diaphragm regulating valve 6, and then sends the above instructions to the pneumatic diaphragm regulating valve 6 through the controller to control the action of the pneumatic diaphragm regulating valve 6, thereby replenishing water for the system. When the pneumatic diaphragm regulating valve 6 fails, the bypass valve 12 can be opened, which will not affect normal production, and then the pneumatic diaphragm regulating valve 6 can be repaired.
[0031] This system solves the problem of extensive manual management of water replenishment of the cooling tower 2 and the circulating water tank 4 in traditional technologies, so that the previous problems of excessive water replenishment, such as tank overflow and waste of water resources; too little water replenishment, such as tank evacuation and frequent pump cavitation failures, are completely solved. The water replenishment of the cooling tower 2 and the circulating water tank 4 is accurately controlled by the industrial control computer, so that both hot and cold exchange, energy conservation and emission reduction, stability and accuracy are achieved, and the labor intensity of operators can be greatly reduced.
[0032] A medium-sized natural gas purification plant can create more than 5 million yuan in benefits by using this invention, minus the cost of technical transformation. This system has low investment cost and short technical transformation cycle. The circulating water system and the hot water system are coordinated through mechanical control and pneumatics to form an organic whole, which saves energy and reduces emissions, and has obvious benefits.
Claims
1. A cold and heat complementary utilization system for an oil and gas processing station, characterized in that: The cold and heat complementary utilization system of the oil and gas processing station comprises a dedicated heating pipeline (1), a cooling tower (2), a circulation pipeline (3), a circulating water tank (4), a dedicated cooling pipeline (5), a pneumatic thin-film regulating valve (6), a differential pressure level gauge (7), a water temperature transmitter (8), a drainage pipeline (9), a circulating water pump (10), a return water pipeline (11), a controller and an industrial computer; wherein the two ends of the dedicated heating pipeline (1) are respectively connected to the circulating water outlet of each heat exchanger in the circulating water system of natural gas purification and the upper part of the cooling tower (2); the two ends of the circulation pipeline (3) are respectively connected to the lower part of the cooling tower (2) and the upper part of the circulating water tank (4); the two ends of the dedicated cooling pipeline (5) are respectively connected to the well source The well water outlet and the lower part of the circulating water tank (4) are connected; the pneumatic diaphragm regulating valve (6) is installed on the cooling pipeline (5); the cooling tower (2) and the lower part of the circulating water tank (4) are both installed with a differential pressure level gauge (7); the heating pipeline (1) and the circulating pipeline (3) are both installed with a water temperature transmitter (8); the two ends of the drainage pipeline (9) are respectively connected to the lower part of the circulating water tank (4) and the water inlet of the circulating water pump (10); the two ends of the return water pipeline (11) are respectively connected to the water outlet of the circulating water pump (10) and the circulating water inlet of each heat exchanger; the industrial computer is electrically connected to the differential pressure level gauge (7), the water temperature transmitter (8) and the pneumatic diaphragm regulating valve (6) through a controller.
2. The cold and heat complementary utilization system of the oil and gas processing station according to claim 1 is characterized in that: The heat exchangers include a natural gas compressor heat exchanger, an ammonia condensation heat exchanger, an air compressor heat exchanger and a molecular sieve regeneration heat exchanger.
3. The cold and heat complementary utilization system of the oil and gas processing station according to claim 1 is characterized in that: The cold pipeline (5) is made of DN60 pipeline.
4. The cold and heat complementary utilization system of the oil and gas processing station according to claim 1 is characterized in that: The controller and the industrial computer are arranged in the central control room of the oil field.
5. The cold and heat complementary utilization system of the oil and gas processing station according to claim 1 is characterized in that: The dedicated cooling pipeline (5) is also provided with a bypass valve (12) connected in parallel with the pneumatic diaphragm regulating valve (6).