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CN-121993773-A - Multi-source coupling heat pump based wide-working-condition steam generation system and dynamic adjustment method

CN121993773ACN 121993773 ACN121993773 ACN 121993773ACN-121993773-A

Abstract

The invention discloses a multi-source coupling heat pump based wide-working-condition steam generation system and a dynamic regulation method, which belong to the technical field of industrial steam production and comprehensive energy utilization, and comprise a heat pump circulation subsystem, wherein the heat pump circulation subsystem comprises an evaporator, a low-temperature heat regenerator, a compressor, a high-temperature heat regenerator, an electric heater and a burner which are connected in sequence, wherein the electric heater and the burner are connected behind an outlet of the high-temperature heat regenerator in a shunting way; and the outlets of the electric heater and the burner are converged and then sequentially connected with the high-pressure cooler, the first low-pressure cooler, the second low-pressure cooler and the throttle valve, and are connected back to the evaporator. According to the invention, three types of energy, namely chemical energy, new energy power generation electric energy such as solar energy and wind energy and low-grade heat energy of a ground source, are integrated, a ground source heat pump is used for providing a basic heat load, the new energy power generation electric heating and the associated gas combustion are utilized for temperature elevation, and the steam output ends with different temperatures and pressures are configured, so that the efficient cascade utilization of the energy and the wide-working-condition steam production are realized.

Inventors

  • ZHANG KAI
  • DENG YAMIN

Assignees

  • 中科南京未来能源系统研究院

Dates

Publication Date
20260508
Application Date
20260122

Claims (8)

  1. 1. Wide operating mode steam generation system based on multisource coupling heat pump, characterized by comprising: The heat pump circulation subsystem comprises an evaporator (1), a low-temperature heat regenerator (4), a compressor (5), a high-temperature heat regenerator (6), an electric heater (9) and a burner (10) which are connected in sequence, wherein the electric heater (9) and the burner (10) are connected behind an outlet of the high-temperature heat regenerator (6) in a shunt mode; The outlet of the electric heater (9) and the outlet of the combustor (10) are connected with the high-pressure cooler (11), the first low-pressure cooler (12), the second low-pressure cooler (14) and the throttle valve (16) in sequence after being converged and are connected back to the evaporator (1); The heat pump cycle subsystem further comprises a water separator (2) and a dryer (3) connected between the second low pressure cooler (14) and the throttle valve (16); The associated gas and carbon capture subsystem comprises a purifier (22), a supercharger (23), a fifth valve (24), an associated gas storage tank (25), a sixth valve (26) and a fuel preheater (27) which are connected in sequence; -the purifier (22) is for receiving oilfield associated gas, the outlet of the fuel preheater (27) being connected to the burner (10); the device also comprises a carbon dioxide buffer tank (28) and a carbon dioxide injection pump (29) which are connected with the outlet end of the compressor (5); The steam generation subsystem comprises a water storage tank (17), a high-pressure water pump (18), a low-pressure water pump (19), a low-pressure steam buffer tank (20) and a high-pressure steam buffer tank (21); the high-pressure water pump (18) sends water in the water storage tank (17) into the first low-pressure cooler (12) for preheating and is evaporated by the high-pressure cooler (11) to generate high-pressure steam; The low-pressure water pump (19) sends water in the water storage tank (17) into the second low-pressure cooler (14) for evaporation to generate low-pressure steam; The energy supply and control subsystem comprises a central controller and a new energy power generation unit, wherein the new energy power generation unit is electrically connected with the compressor (5), the electric heater (9) and the carbon dioxide injection pump (29), and the central controller is used for dynamically regulating the system to operate according to the new energy power generation amount and the associated gas flow.
  2. 2. The wide-operating mode steam generating system based on the multi-source coupling heat pump according to claim 1, wherein the burner (10) is configured to directly discharge high-temperature carbon dioxide and water vapor generated by the combustion of associated gas into a heat pump circulation pipeline to participate in circulation; part of working medium at the outlet of the compressor (5) is guided to a carbon dioxide buffer tank (28), pressurized by a carbon dioxide injection pump (29) and then used for injecting and sealing up a depleted oil well.
  3. 3. The wide-operating mode steam generating system based on the multi-source coupling heat pump according to claim 1, wherein the low-temperature regenerator (4) is configured to utilize the working medium waste heat before the working medium absorption throttle valve (16) of the outlet of the evaporator (1); the high-temperature heat regenerator (6) is configured to absorb the residual heat of the working medium at the outlet of the high-pressure cooler (11) by utilizing the working medium at the outlet of the compressor (5).
  4. 4. The wide-operating mode steam generating system based on the multi-source coupling heat pump according to claim 1, wherein the inlet side of the burner (10) is provided with a second valve (8), and the inlet side of the electric heater (9) is provided with a first valve (7); A third valve (13) is arranged between the high-pressure cooler (11) and the first low-pressure cooler (12), a fourth valve (15) is arranged between the first low-pressure cooler (12) and the second low-pressure cooler (14), and the central controller is respectively electrically connected with the first valve (7), the second valve (8), the third valve (13), the fourth valve (15), the fifth valve (24) and the sixth valve (26) to adjust the opening degree.
  5. 5. The wide operating range steam generating system based on a multi-source coupled heat pump according to claim 1, wherein the liquid phase outlet of the water separator (2) is connected to the water storage tank (17) for recovering moisture generated by combustion.
  6. 6. The multi-source coupled heat pump wide operating mode steam generation system of claim 1, further comprising: a pressure sensor and a component detection sensor disposed in the heat pump circulation line; The central controller is configured to control the rotation speed or the starting frequency of the carbon dioxide injection pump (29) based on the detection value of the pressure sensor, so that the carbon dioxide mass injected into the circulation through the burner (10) and the carbon dioxide mass discharged through the carbon dioxide injection pump (29) in unit time are kept in dynamic balance, and the high-pressure side pressure of the heat pump circulation is maintained within a set threshold range.
  7. 7. The dynamic adjustment method based on the wide working condition steam generation system of the multi-source coupling heat pump is applied to the wide working condition steam generation system based on the multi-source coupling heat pump as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps: s1, driving a ground source heat pump module by using a new energy power generation unit, and enabling a circulating working medium to absorb ground source heat through an evaporator (1) and to be compressed and heated through a compressor (5); S2, carrying out multi-source cooperative regulation according to the generated energy of the new energy and the flow of the associated gas, regulating full-load operation of an electric heater (9) by a central controller when the generated energy of the new energy is sufficient, optimizing parameters of a heat pump unit, starting a booster (23) to store redundant associated gas into an associated gas storage tank (25) when the generated flow of the associated gas exceeds the system requirement, and supplementing fuel and auxiliary power supply of a power grid by the associated gas storage tank (25) when the flow of the associated gas is too low or the new energy is in shortage; S3, performing graded heating and steam production, wherein after the electric heater (9) and the burner (10) are heated, the high-temperature circulating working medium releases heat in a graded mode in the system, high-pressure steam is generated through the cooperation of the high-pressure water pump (18) and the high-pressure cooler (11), and low-pressure steam is generated through the cooperation of the low-pressure water pump (19) and the second low-pressure cooler (14).
  8. 8. The dynamic adjustment method based on the multi-source coupling heat pump wide-working-condition steam generation system according to claim 7, wherein the pressure range of the high-pressure steam is 1.2-4.0 MPa, and the temperature range is 194-250 ℃; the pressure range of the low-pressure steam is 0.1-0.4 MPa, and the temperature range is 99-151 ℃.

Description

Multi-source coupling heat pump based wide-working-condition steam generation system and dynamic adjustment method Technical Field The invention belongs to the technical field of industrial steam production and comprehensive energy utilization, and particularly relates to a wide-working-condition steam generation system based on a multi-source coupling heat pump and a dynamic adjustment method. Background A large amount of associated gas can be generated in the oil field development process, and the traditional treatment mode is mainly direct emptying combustion, so that energy waste is caused, pollutants such as CO 2、NOx and the like are also generated, the targets of carbon peak reaching and carbon neutralization are not met, meanwhile, the oil field and the surrounding area often have rich new energy resources such as wind energy, solar energy and the like, but the energy value of the oil field is not fully excavated, the underground low-grade heat energy can be stably obtained by the ground source heat pump technology, but the heating efficiency is low when the oil field heat pump technology is singly used, and the requirement of industrial high-temperature steam (generally more than 300 ℃) cannot be directly met. In the existing industrial high-temperature steam production technology, the cost is high and pollution is large due to the fact that fossil fuels (such as natural gas and crude oil) are singly relied on, pure electric heating is limited by the electricity price and stability of a power grid, and the output temperature of a single heat pump system is insufficient. Disclosure of Invention The invention aims to solve the problems of low energy utilization rate and poor steam production efficiency of energy coupling existing in the single dependence on fossil fuel in the high-temperature steam production technology, and provides a multi-source coupling heat pump based wide-working-condition steam generation system and a dynamic adjusting method. In order to achieve the above purpose, the present invention adopts the following technical scheme: based on wide operating mode steam generation system of multisource coupling heat pump, include: The heat pump circulation subsystem comprises an evaporator, a low-temperature heat regenerator, a compressor, a high-temperature heat regenerator, an electric heater and a burner which are connected in sequence, wherein the electric heater and the burner are connected behind an outlet of the high-temperature heat regenerator in a shunting way; the outlet of the electric heater and the outlet of the burner are connected with the high-pressure cooler, the first low-pressure cooler, the second low-pressure cooler and the throttle valve in sequence after being converged and are connected back to the evaporator; The heat pump cycle subsystem further comprises a water separator and a dryer connected between the second low pressure cooler and the throttle valve; the associated gas and carbon capture subsystem comprises a purifier, a supercharger, a fifth valve, an associated gas storage tank, a sixth valve and a fuel preheater which are connected in sequence; the purifier is used for receiving oilfield associated gas, and the outlet of the fuel preheater is connected to the combustor; The device also comprises a carbon dioxide buffer tank and a carbon dioxide injection pump which are connected to the outlet end of the compressor; The steam generation subsystem comprises a water storage tank, a high-pressure water pump, a low-pressure steam buffer tank and a high-pressure steam buffer tank; The high-pressure water pump sends water in the water storage tank into the first low-pressure cooler for preheating and evaporates through the high-pressure cooler to generate high-pressure steam; the low-pressure water pump sends water in the water storage tank into a second low-pressure cooler for evaporation to generate low-pressure steam; The energy supply and control subsystem comprises a central controller and a new energy power generation unit, wherein the new energy power generation unit is electrically connected with the compressor, the electric heater and the carbon dioxide injection pump, and the central controller is used for dynamically regulating the system to operate according to the new energy power generation amount and the associated gas flow. As a further description of the above technical solution: The burner is configured to directly discharge high-temperature carbon dioxide and water vapor generated by the combustion of associated gas into a heat pump circulation pipeline to participate in circulation; And part of working medium at the outlet of the compressor is guided to a carbon dioxide buffer tank, pressurized by a carbon dioxide injection pump and then used for injecting and sealing up an exhausted oil well. As a further description of the above technical solution: The low-temperature heat regenerator is configured to absorb the residual heat of the worki