Steam generation system with air source steam engine coupled with steam compressor

Abstract

The utility model relates to the technical field of steam generation and supply systems, in particular to a steam generation system with an air source steam engine coupled with a steam compressor. The steam generation system comprises an air source heat pump steam engine, a flash tank, a steam compressor and a buffer tank which are sequentially connected, the steam generation system further comprises a heat exchanger and a water tank, the heat exchanger comprises a heat release pipe and a heat absorption pipe, and an inlet of the heat release pipe is connected with a discharge port of the buffer tank; a buffer tank discharge regulating valve is arranged on a pipeline connecting an inlet of the heat release pipe and a discharge port of the buffer tank, an outlet of the heat release pipe is connected with the water tank, an inlet of the heat absorption pipe is connected with a water outlet of the flash tank, and an outlet of the heat absorption pipe is connected with a water return port of the air source heat pump steam engine. According to the steam generation system with the air source steam engine coupled with the steam compressor, the steam compressor is coupled, a large-temperature-rise heat supply path of heat pump flash evaporation and steam compression is formed, and a new possibility is provided for providing steam with higher pressure and temperature.

Description

Technical Field

[0001] This utility model relates to the technical field of steam generation and supply systems, specifically to a steam generation system that couples an air-source steam engine with a steam compressor. Background Technology

[0002] Steam compressor steam generation systems have been widely used in many fields, especially in industry and energy. Due to their high efficiency, energy saving, and environmental friendliness, and driven by the government's emphasis on energy conservation, emission reduction, and green development, steam compressor steam generation systems have received favorable policy support. Many universities, research institutions, and enterprises have engaged in industry-academia-research collaborations to jointly promote the advancement and application of this technology.

[0003] However, due to current technological limitations, despite the huge market demand for steam with higher pressure and temperature, the most mature industrial heat pumps currently available can only provide low-pressure steam.

[0004] Therefore, a new technology is urgently needed to solve this problem. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this application provides a steam generation system that couples an air-source steam engine with a steam compressor. This system, by coupling the steam compressor, forms a heat pump flash evaporation and steam compression path with a large temperature rise, opening up new possibilities for providing steam with higher pressure and temperature.

[0006] To achieve the above objectives, this utility model provides a steam generation system that couples an air-source steam engine with a steam compressor.

[0007] The steam generation system includes an air-source heat pump steam engine, a flash tank, a steam compressor, and a buffer tank connected in sequence. The system also includes a heat exchanger and a water tank. The heat exchanger comprises heat-releasing pipes and heat-absorbing pipes. The inlet of the heat-releasing pipe is connected to the vent of the buffer tank. A vent regulating valve for the buffer tank is installed on the pipe connecting the inlet of the heat-releasing pipe to the vent of the buffer tank. The outlet of the heat-releasing pipe is connected to the water tank. The inlet of the heat-absorbing pipe is connected to the outlet of the flash tank, and the outlet of the heat-absorbing pipe is connected to the return port of the air-source heat pump steam engine. The steam generation system also includes a programmable logic controller (PLC), which is connected to the air-source heat pump steam engine, the flash tank, the steam compressor, the buffer tank, and the buffer tank vent regulating valve.

[0008] Preferably, the water outlet of the water tank is connected to the water inlet of the flash tank through a flash tank water supply pipe. The flash tank water supply pipe is equipped with a flash tank water supply check valve, a flash tank water supply electric valve, a first water supply pump shut-off valve, a water supply pump check valve, a water supply pump, and a second water supply pump shut-off valve.

[0009] Preferably, the pipe connecting the inlet of the heat absorption pipe to the outlet of the flash tank is equipped with a first shut-off valve for the circulation pump, a pressure gauge after the circulation pump, a check valve for the circulation pump, a circulation pump, a circulation pump filter, a pressure gauge before the circulation pump, and / or a second shut-off valve for the circulation pump.

[0010] Preferably, a pressure tank is further provided on the water supply pipe of the flash tank, and a pressure transmitter is installed inside the pressure tank, which is connected to the water supply pump.

[0011] Preferably, the air source heat pump steam engine and the flash tank are connected by a heat pump outlet pipe, and the heat pump outlet pipe is equipped with a heat pump outlet flow meter, a heat pump outlet pressure transmitter and / or a heat pump outlet temperature transmitter connected to a programmable logic controller.

[0012] Preferably, the flash tank is equipped with a flash tank pressure transmitter, a flash tank temperature transmitter, a flash tank level gauge, and / or a flash tank safety valve, all connected to a programmable logic controller.

[0013] Preferably, the flash tank and the steam compressor are connected through the flash tank outlet pipe, and the flash tank outlet pipe is equipped with a flash tank outlet regulating valve and / or a flash tank outlet drain valve connected to a programmable logic controller.

[0014] Preferably, the steam compressor is equipped with a frequency converter.

[0015] Preferably, the buffer tank is equipped with a buffer tank pressure transmitter and / or a buffer tank temperature transmitter connected to a programmable logic controller.

[0016] Preferably, the steam generating system further includes a steam distributor, and the outlet of the buffer tank is connected to the steam distributor via a steam pipeline. The steam pipeline is equipped with a steam pipeline electric heater, a buffer tank air supply pipe regulating valve, a buffer tank air supply flow meter, a buffer tank air supply pressure transmitter, a buffer tank air supply temperature transmitter, and / or a buffer tank air supply shut-off valve.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] Firstly, the steam generation system of the air-source steam engine coupled with a steam compressor involved in this invention, by employing a buffer tank, a venting regulating valve, and a heat exchanger, allows the steam generation system to adjust the load of the steam compressor when the terminal steam demand changes, thereby meeting the requirements of different steam temperatures and pressures. The steam generation system is responsive, stable, and reliable.

[0019] Secondly, in scenarios requiring higher pressure and temperature steam, the steam generation system can utilize a heat pump steam engine coupled with a steam compressor unit to achieve high-temperature steam supply.

[0020] In addition, the steam generation system can absorb and utilize low-grade heat energy, flash evaporate high-temperature hot water, and mechanically compress low-pressure steam during the heating process, and achieve efficient and reliable connection in each link and continuous, safe and stable operation of the whole system. Attached Figure Description

[0021] This application can be better understood by describing its embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the steam generation system of an air-source steam engine coupled with a steam compressor according to this application.

[0023] Explanation of icon numbers:

[0024] 10. Air source heat pump steam generator; 11. Flash tank; 12. Steam compressor; 13. Buffer tank; 14. Heat pump outlet water pipe; 15. Heat pump outlet water flow meter; 16. Heat pump outlet water pressure transmitter; 17. Heat pump outlet water temperature transmitter; 18. Flash tank pressure transmitter; 19. Flash tank temperature transmitter; 20. Flash tank level gauge; 21. Flash tank safety valve; 22. Flash tank electric heater; 23. Flash evaporator... 24. Flash tank outlet pipe; 25. Flash tank outlet regulating valve; 26. Flash tank outlet pipe drain valve; 27. Steam compressor water supply pipe; 28. Compressor water supply flow meter; 29. ​​Compressor water supply electric valve; 30. Frequency converter; 31. Buffer tank vent valve; 32. Heat exchanger; 33. Water tank; 34. Buffer tank vent regulating valve; 35. Programmable logic controller; 36. Buffer tank pressure transmitter; 37. Buffer tank temperature... Transmitter; 37. Flash tank water supply pipe; 38. Flash tank water supply check valve; 39. Flash tank water supply electric valve; 40. First water supply pump shut-off valve; 41. Water supply pump check valve; 42. Water supply pump; 43. Second water supply pump shut-off valve; 44. Pressure tank; 45. Pressure tank pressure transmitter; 46. RO reverse osmosis water purifier; 47. Water purifier shut-off valve; 48. Circulation pump first shut-off valve; 49. Circulation pump downstream pressure gauge; 50. Circulation pump check valve; 51. Circulation pump; 52. Circulation pump filter; 53. Circulation pump upstream pressure gauge; 54. Circulation pump second shut-off valve; 55. Steam distributor; 56. Steam pipe; 57. Steam pipe electric heater; 58. Buffer tank air supply pipe regulating valve; 59. Buffer tank air supply flow meter; 60. Buffer tank air supply pressure transmitter; 61. Buffer tank air supply temperature transmitter; 62. Buffer tank air supply shut-off valve. Detailed Implementation

[0025] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] This utility model provides a method such as Figure 1 The steam generation system shown is an air-source steam engine coupled with a steam compressor 12.

[0031] The steam generation system includes an air-source heat pump steam generator 10, a flash tank 11, a steam compressor 12, and a buffer tank 13 connected in sequence. The air-source heat pump steam generator 10 and the flash tank 11 can be connected via a heat pump outlet pipe 14. The heat pump outlet pipe 14 can be equipped with a heat pump outlet water flow meter 15, a heat pump outlet water pressure transmitter 16, and / or a heat pump outlet water temperature transmitter 17, all connected to a programmable logic controller 34. The flash tank 11 is equipped with a flash tank pressure transmitter 18, a flash tank temperature transmitter 19, a flash tank level gauge 20, and / or a flash tank safety valve 21, all connected to the programmable logic controller 34. An electric heater 22 can also be installed inside the flash tank 11. The flash tank 11 and the steam compressor 12 can be connected via the flash tank outlet pipe 23. The flash tank outlet pipe 23 can be equipped with a flash tank outlet regulating valve 24 and / or a flash tank outlet drain valve 25 connected to the programmable logic controller 34. The water inlet of the steam compressor 12 can be connected to a steam compressor water supply pipe 26. The steam compressor water supply pipe 26 can be equipped with a compressor water supply flow meter 27 and / or a compressor water supply electric valve 28.

[0032] The air-source heat pump steam generator 10 can absorb low-grade heat energy from the air to produce high-temperature hot water. The high-temperature hot water is then transported to a flash tank 11 to flash-evaporate low-pressure steam. This low-pressure steam is mechanically compressed in a steam compressor 12 to produce high-temperature steam, which then enters a buffer tank 13. The steam is then delivered to the end-user device.

[0033] In some embodiments, a frequency converter 29 is provided on the steam compressor 12. The frequency converter 29 can be used to control the operating frequency of the steam compressor 12.

[0034] When the steam compressor 12 starts, the frequency converter 29 can control the steam compressor 12 to run at several fixed frequencies for several minutes, and then switch to frequency adjustment according to the steam supply pressure. In such cases... Figure 1 In the embodiment shown, after the steam compressor 12 is started, it first runs at a first fixed frequency of 30Hz for 1 minute, then rises to a second fixed frequency of 60Hz for 2 minutes, then rises to a third fixed frequency of 90Hz for 3 minutes, and then switches to adjusting the frequency according to the steam supply pressure.

[0035] When adjusting the operating frequency of the steam compressor 12 according to the steam supply pressure, the higher the steam supply pressure, the lower the operating frequency of the steam compressor 12, and the longer the minimum frequency is maintained. For example, in... Figure 1In the illustrated embodiment, when the steam supply pressure is in the low pressure range (1-2.8 bar), the unit operates at a high frequency of 150 Hz with a minimum holding time of 1 minute. When the steam supply pressure is in the second-lowest pressure range (2.8-3.5 bar), the unit operates at a second-highest frequency of 130 Hz with a minimum holding time of 2 minutes. When the steam supply pressure is in the medium pressure range (3.5-3.8 bar), the unit operates at a medium frequency of 110 Hz with a minimum holding time of 3 minutes. When the steam supply pressure is in the second-highest pressure range (3.8-4 bar), the unit operates at a second-lowest frequency of 90 Hz with a minimum holding time of 4 minutes. When the steam supply pressure is above the high pressure range (4 bar), the unit operates at a low frequency of 70 Hz with a minimum holding time of 5 minutes.

[0036] In some embodiments, a buffer tank vent valve 30 is provided on the buffer tank 13. When the steam supply pressure of the steam compressor exceeds the high-pressure upper limit setting, the buffer tank vent valve 30 can be opened to a certain extent to release the system pressure and protect the steam compressor 12 and terminal equipment. When the steam supply pressure is lower than the high-pressure lower limit setting, the buffer tank vent valve 30 is closed, and the system returns to normal operation. In the embodiment shown in the figure, the high-pressure upper limit setting of the steam supply pressure of the steam compressor is set to 4.5 bar, the high-pressure lower limit setting is set to 3.8 bar, and the opening ratio of the buffer tank vent valve 30 is set to 10%.

[0037] When the steam compressor 12 stops, the buffer tank vent valve 30 can be opened to a certain extent. The frequency converter 29 can control the steam compressor 12 to run at several fixed frequencies for several minutes before stopping the motor. Figure 1 In the embodiment shown, after the steam compressor 12 receives the shutdown signal, the electric regulating valve of the buffer tank 13 is opened to 50%. The steam compressor 12 first runs at a fixed frequency of 70Hz for 3 minutes, then at a fixed frequency of 30Hz for 5 minutes, and finally stops the motor.

[0038] In addition, to ensure the safe operation of the steam generation system, frequency reduction protection control and emergency stop protection control of the steam compressor can be implemented.

[0039] Frequency reduction protection control refers to the inverter 29 reducing the frequency of the steam compressor for several minutes when the main motor current, compressor discharge temperature, or compressor discharge pressure exceeds a set value. After the parameters return to the set value range, the inverter continues to adjust the operating frequency of the steam compressor 12 according to the steam supply pressure. In the embodiment shown in the figure, the main motor current setting for triggering frequency reduction protection control is set to 530A, the compressor discharge temperature setting is set to 160℃, and the compressor discharge pressure setting is set to 4.2 bar. When frequency reduction protection control is executed, the steam compressor is reduced to 60Hz and runs for 5 minutes.

[0040] The emergency stop protection control for the steam compressor refers to the direct shutdown of the main motor when the emergency stop switch is pressed, the compressor suction pressure falls below a set value, the main motor current exceeds a set value, the compressor discharge temperature exceeds a set value, or the compressor discharge pressure exceeds a set value. In the embodiment shown in the figure, the compressor suction pressure setpoint for triggering the emergency stop protection control of the steam compressor is set to 0.5 bar, the main motor current setpoint is set to 550 A, the compressor discharge temperature setpoint is set to 180 °C, and the compressor discharge pressure setpoint is set to 4.6 bar.

[0041] The steam generation system also includes a heat exchanger 31 and a water tank 32. The heat exchanger 31 can be a plate heat exchanger.

[0042] The heat exchanger 31 includes a heat-dissipating pipe and a heat-absorbing pipe. The inlet of the heat-dissipating pipe is connected to the vent of the buffer tank 13. A buffer tank vent regulating valve 33 is installed on the pipe connecting the inlet of the heat-dissipating pipe to the vent of the buffer tank 13. The outlet of the heat-dissipating pipe is connected to the water tank 32. The inlet of the heat-absorbing pipe is connected to the outlet of the flash tank 11. The outlet of the heat-absorbing pipe is connected to the return water port of the air source heat pump steam engine 10.

[0043] The steam generation system also includes a programmable logic controller 34, which is connected to the air source heat pump steam engine 10, the flash tank 11, the steam compressor 12, the buffer tank 13, and the buffer tank relief regulating valve 33.

[0044] In some embodiments, the buffer tank 13 is provided with a buffer tank pressure transmitter 35 and / or a buffer tank temperature transmitter 36 connected to a programmable logic controller 34.

[0045] In the embodiment shown in the figure, when the gas consumption at the end of the device decreases, the buffer tank pressure transmitter 35 detects that the pressure inside the buffer tank 13 has risen to a certain set value. The programmable logic controller 34 then opens the buffer tank vent regulating valve 33, allowing high-temperature steam to flow out from the vent of the buffer tank 13. This steam then flows through the buffer tank vent regulating valve 33 and the heat exchanger 31 before entering the water tank 32, heating the water inside. In some embodiments, the outlet of the water tank 32 is connected to the water inlet of the flash tank 11 via a flash tank water inlet pipe 37. The flash tank water inlet pipe 37 is equipped with a flash tank water inlet check valve 38, a flash tank water inlet electric valve 39, a first water inlet pump shut-off valve 40, a water inlet pump check valve 41, a water inlet pump 42, and a second water inlet pump shut-off valve 43. A pressure tank 44 can be further installed on the flash tank water supply pipe 37. A pressure transmitter 45 can be installed inside the pressure tank 44, and the pressure transmitter 45 can be connected to the water supply pump 42. By heating the water in the water tank 32, the water supply problem of the flash tank 11 can be improved, thereby improving the overall heating efficiency of the system.

[0046] In some embodiments, the water tank 32 can also be connected to a municipal pipeline via a pipe. An RO reverse osmosis water purifier 46 and a water purifier shut-off valve 47 can be installed on the pipe connecting the water tank 32 to the municipal pipeline to ensure the purity of the water in the water tank 32.

[0047] In some embodiments, the pipe connecting the inlet of the heat absorber tube to the outlet of the flash tank 11 is equipped with a first shut-off valve 48 for the circulation pump, a pressure gauge 49 after the circulation pump, a check valve 50 for the circulation pump, a circulation pump 51, a filter 52 for the circulation pump, a pressure gauge 53 before the circulation pump, and / or a second shut-off valve 54 for the circulation pump. A flexible connection can be used between the circulation pump 51 and the check valve 50, and / or between the circulation pump 51 and the filter 52. The high-temperature hot water in the heat absorber tube can further exchange heat with high-temperature steam in the heat exchanger 31, thereby increasing the temperature of the flash micro-pressure steam, thus improving system efficiency and reducing system energy consumption.

[0048] In some embodiments, the steam generating system further includes a steam distributor 55, and the outlet of the buffer tank 13 is connected to the steam distributor 55 via a steam pipe 56. The steam pipe 56 is equipped with a steam pipe electric heater 57, a buffer tank air supply pipe regulating valve 58, a buffer tank air supply flow meter 59, a buffer tank air supply pressure transmitter 60, a buffer tank air supply temperature transmitter 61, and / or a buffer tank air supply shut-off valve 62.

[0049] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A steam generation system of an air-source steam engine coupled with a steam compressor, characterized in that, The steam generation system includes an air-source heat pump steam engine, a flash tank, a steam compressor, and a buffer tank connected in sequence. The system also includes a heat exchanger and a water tank. The heat exchanger includes a heat-releasing pipe and a heat-absorbing pipe. The inlet of the heat-releasing pipe is connected to the vent of the buffer tank. A vent regulating valve is installed on the pipe connecting the inlet of the heat-releasing pipe to the vent of the buffer tank. The outlet of the heat-releasing pipe is connected to the water tank. The inlet of the heat-absorbing pipe is connected to the outlet of the flash tank, and the outlet of the heat-absorbing pipe is connected to the return water port of the air-source heat pump steam engine. The steam generation system also includes a programmable logic controller (PLC), which is connected to the air-source heat pump steam engine, the flash tank, the steam compressor, the buffer tank, and the vent regulating valve.

2. The steam generating system according to claim 1, characterized in that, The outlet of the water tank is connected to the water inlet of the flash tank through a flash tank water supply pipe. The flash tank water supply pipe is equipped with a flash tank water supply check valve, a flash tank water supply electric valve, a first water supply pump shut-off valve, a water supply pump check valve, a water supply pump, and a second water supply pump shut-off valve.

3. The steam generating system according to claim 1, characterized in that, The pipe connecting the inlet of the heat absorption pipe to the outlet of the flash tank is equipped with a first shut-off valve for the circulation pump, a pressure gauge after the circulation pump, a one-way valve for the circulation pump, the circulation pump, a circulation pump filter, a pressure gauge before the circulation pump, and / or a second shut-off valve for the circulation pump.

4. The steam generating system according to claim 2, characterized in that, A pressure tank is further installed on the water supply pipe of the flash tank, and a pressure transmitter is installed inside the pressure tank. The pressure transmitter is connected to the water supply pump.

5. The steam generating system according to claim 1, characterized in that, The air source heat pump steam engine and the flash tank are connected by a heat pump outlet pipe. The heat pump outlet pipe is equipped with a heat pump outlet flow meter, a heat pump outlet pressure transmitter and / or a heat pump outlet temperature transmitter connected to a programmable logic controller.

6. The steam generating system according to claim 1, characterized in that, The flash tank is equipped with a flash tank pressure transmitter, a flash tank temperature transmitter, a flash tank level gauge, and / or a flash tank safety valve, all connected to a programmable logic controller.

7. The steam generating system according to claim 1, characterized in that, The flash tank and the steam compressor are connected by a flash tank outlet pipe. The flash tank outlet pipe is equipped with a flash tank outlet regulating valve and / or a flash tank outlet drain valve connected to a programmable logic controller.

8. The steam generating system according to claim 1, characterized in that, The steam compressor is equipped with a frequency converter.

9. The steam generating system according to claim 1, characterized in that, The buffer tank is equipped with a buffer tank pressure transmitter and / or a buffer tank temperature transmitter connected to a programmable logic controller.

10. The steam generating system according to claim 1, characterized in that, The steam generation system further includes a steam distribution manifold, and the outlet of the buffer tank is connected to the steam distribution manifold via a steam pipeline. The steam pipeline is equipped with a steam pipeline electric heater, a buffer tank air supply pipe regulating valve, a buffer tank air supply flow meter, a buffer tank air supply pressure transmitter, a buffer tank air supply temperature transmitter, and / or a buffer tank air supply shut-off valve.

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