Stepped heating heat pump steam supply system

Abstract

The utility model relates to the field of heat pump steam supply, in particular to a stepped heating heat pump steam supply system which is characterized in that a water supplementing pipeline is preheated through a water supplementing preheating device and a heat pump heating device and then provides preheating water for a flash evaporation device, and the water supplementing preheating device can utilize waste heat to preliminarily preheat supplementing flushing water; the heat pump heating device can heat replenished water in a circulating pipeline of the flash evaporation device through the heat exchanger and can also heat replenished flushing water again, so that the replenished water temperature is further increased, high-temperature hot water in the flash evaporation device is replenished into the flash evaporation system, the replenished water temperature of the system is increased, and the energy consumption of the system is reduced. The impact of low water replenishing temperature on stable operation of the system is avoided; the water replenishing preheating device and the heat pump heating device can achieve stepped preheating of water replenishing temperature, waste heat energy is fully utilized, the overall energy consumption of the system is reduced, and the steam generation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of heat pump steam supply, and in particular to a step-by-step temperature increase heat pump steam supply system. Background Art

[0002] At present, the high-temperature steam used in my country's production process is still mainly produced by fuel-fired boilers. The use of these boilers not only wastes a large amount of primary energy, but also produces boiler exhaust gas containing a large amount of air pollutants. These exhaust gases are directly discharged into the atmosphere, polluting the environment and wasting energy. Heat pumps can absorb heat energy from low-grade energy to heat cold water, reducing the consumption of high-quality energy in the heating process. They are a clean and efficient heating equipment. Among them, air source heat pumps are widely used in the "coal to electricity" project for winter heating. Compared with the short-term use of domestic heating in northern China in winter, the domestic hot water required for daily life and the high-temperature steam required for industrial use are in uninterrupted demand throughout the year. If fuel-fired boilers are still used to provide the domestic hot water and high-temperature steam required for industrial use, a large amount of environmental pollution exhaust gas will be generated and a large amount of high-quality energy will be wasted.

[0003] There are some technical means in the existing technology for supplying high-temperature and high-pressure steam through heat pump technology, especially the coupling of heat pump technology and water vapor compression technology to further increase the temperature and pressure of the supplied steam. However, when these technologies are used for heating, the preheating problem of make-up water is rarely considered. The make-up water is directly introduced into the system, which not only reduces the heating temperature in the system and affects the safe and stable operation of the system, but also affects the amount of steam generated to a certain extent, which is not conducive to steam generation. Utility Model Content

[0004] In order to solve or at least partially solve the above technical problems, the present application provides a stepped temperature increase heat pump steam supply system, comprising:

[0005] a flash evaporation unit for producing steam and water;

[0006] a steam supply pipeline connected to the output end of the flash evaporation device for processing steam;

[0007] a heat pump heating device connected to the circulation pipeline of the flash evaporation device through a heat exchanger, and used to heat water in the circulation pipeline of the flash evaporation device;

[0008] Make-up water preheating device;

[0009] A water supply pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the water supply preheating device and the heat exchange side of the heat exchanger, so as to provide preheated water to the circulation pipeline of the flash evaporation device through heating of the water supply preheating device and the heat exchanger.

[0010] Optionally, the water supply preheating device includes a first water supply preheater and a second water supply preheater;

[0011] The second make-up water preheater is provided on a circulation pipeline of the flash evaporation device upstream of the heat exchanger, and the make-up water pipeline is connected to the first make-up water preheater and the second make-up water preheater in sequence.

[0012] Optionally, the heat pump heating device is a cascade heat pump device, which includes a first-stage heat pump device and a second-stage heat pump device, and the heat exchanger includes a first condenser of the first-stage heat pump device and a second condenser of the second-stage heat pump device. The first-stage heat pump device is connected to the second-stage heat pump device through the first condenser, and the second-stage heat pump device is connected to the circulation pipeline of the flash evaporation device through the second condenser, and the water supply pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the second condenser.

[0013] Optionally, the make-up water pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the first make-up water preheater, the heat exchange side of the first condenser, the heat exchange side of the second make-up water preheater and the heat exchange side of the second condenser in sequence.

[0014] Optionally, the flash evaporation device includes a flash tank and a flash circulation pipeline connected to the flash tank, the flash circulation pipeline is connected to a circulating heating water pump, the second make-up water preheater, the second condenser and a flash valve in sequence, and the make-up water pipeline is connected to the pipeline between the flash tank and the circulating heating water pump.

[0015] Optionally, the steam supply pipeline includes a steam outlet pipe and a steam bypass pipe connected to the steam output end of the flash tank, and the steam outlet pipe is provided with a steam compressor for pressurizing the steam to generate high-pressure steam.

[0016] Optionally, a liquid spraying device is further included, which includes a liquid spraying pipeline and a liquid spraying pump. The input end of the liquid spraying pipeline is connected to the flash tank, and the output end of the liquid spraying pipeline is connected to the water vapor compressor, which is used to spray the water in the flash tank into the water vapor compressor.

[0017] Optionally, the first-stage heat pump device includes a first evaporator, a first compressor, a first condenser and a first expansion valve connected in sequence through a first heat pump circulation pipeline, and the first heat pump circulation pipeline between the first condenser and the first expansion valve is connected to the first compressor through a first air supply pipe.

[0018] Optionally, the secondary heat pump device includes a second compressor, a second condenser and a second expansion valve connected in sequence through a second heat pump circulation pipeline, the upstream pipeline of the second compressor passes through the first condenser, and the second heat pump circulation pipeline between the second condenser and the second expansion valve is connected to the second compressor through a second air supply pipe.

[0019] Optionally, one heat exchange side of the first make-up water preheater is connected to the make-up water pipeline, and the other heat exchange side of the first make-up water preheater is connected to the high-temperature waste heat pipeline.

[0020] The step-by-step heating heat pump steam supply system provided in the present application preheats the feed water pipeline through a feed water preheating device and a heat pump heating device respectively, and then provides preheated water to the flash evaporation device. The feed water preheating device can use waste heat to preliminarily preheat the feed water. The heat pump heating device can heat the feed water in the circulation pipeline of the flash evaporation device through a heat exchanger and can also heat the feed water again, so that the feed water temperature is further increased, and the temperature is very close to the high-temperature hot water in the flash evaporation device. The feed water temperature of the system is increased, and the impact of low feed water temperature on the stable operation of the system is avoided. The feed water preheating device and the heat pump heating device can realize step-by-step preheating of the feed water temperature, make full use of waste heat energy, reduce the overall energy consumption of the system, and help improve the steam generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present application, the following briefly introduces the relevant drawings. It should be understood that the drawings described below are only used to illustrate some embodiments of the present application, and those skilled in the art can also obtain many other technical features and connection relationships not mentioned herein based on these drawings.

[0022] Figure 1 This is a structural diagram of an embodiment of the step-by-step heating heat pump steam supply system of the present application;

[0023] Figure 2 This is a structural diagram of another embodiment of the stepped temperature increase heat pump steam supply system of the present application.

[0024] Description of reference numerals:

[0025] 1. Waste heat inlet pipe; 2. First evaporator; 3. Waste heat outlet pipe; 4. First liquid return pipe; 5. First air inlet pipe; 6. First compressor; 7. First air outlet pipe; 8. First condenser; 9. First condenser pipe; 10. First expansion valve; 11. Air supply pipe before the first valve; 12. First air supply expansion valve; 13. Air supply pipe after the first valve;

[0026] 21. Second air inlet pipe; 22. Second compressor; 23. Second air outlet pipe; 24. Second condenser; 25. Second condensing pipe; 26. Second expansion valve; 27. Second liquid return pipe; 28. Second valve front air supply pipe; 29. Second air supply expansion valve; 30. Second valve rear air supply pipe;

[0027] 31. Make-up water pump; 32. First make-up water pipe; 33. High-temperature waste heat pipe; 34. First make-up water preheater; 35. Low-temperature waste heat pipe; 36. Second make-up water pipe; 37. Third make-up water pipe; 38. Fourth make-up water pipe; 39. Fifth make-up water pipe;

[0028] 41. Flash tank; 42. Water spray pipe; 43. First stop valve; 44. First circulation pipe; 45. Circulating heating water pump; 46. Second feed water preheater; 47. Second circulation pipe; 48. Third circulation pipe; 49. Second stop valve; 50. Flash valve;

[0029] 51. Third stop valve; 52. Drain pipe;

[0030] 61. Water vapor outlet pipe; 62. Fourth stop valve; 63. Water vapor compressor; 64. Water vapor exhaust pipe; 65. Fifth stop valve; 66. Sixth stop valve; 67. Water vapor bypass pipe; 68. Compressor liquid injection pipe; 69. Liquid injection pump; 70. Flow regulating valve. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0034] The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings in the embodiments of the present application.

[0035] Example 1

[0036] This embodiment provides a stepped heating heat pump steam supply system, which consists of a heat pump heating device, a flash evaporation device, a steam supply pipeline and a water supply pipeline. The flash evaporation device is used to generate low-temperature, low-pressure steam and high-temperature water. The heat pump heating device is used to heat the pipeline of the flash evaporation device. The steam supply pipeline is used to process the low-temperature, low-pressure steam generated by the flash evaporation device or directly provide it to users. The water supply pipeline is used to replenish water into the circulation pipeline of the flash evaporation device.

[0037] like Figure 1 As shown, the flash evaporation device includes a flash tank 41 and a flash evaporation circulation pipeline connected to the flash tank 41 . The flash evaporation circulation pipeline includes a first circulation pipe 44 , a second circulation pipe 47 and a third circulation pipe 48 .

[0038] Specifically, a first circulation pipe 44 is connected to the flash tank 41 at one end and to the feed water preheating device at the other end. The first circulation pipe 44 is equipped with a first shutoff valve 43 and a circulating heating water pump 45. The circulating heating water pump 45 is connected to the feed water preheating device, which is then connected to the heat exchanger of the heat pump heating device via a second circulation pipe 47. A third circulation pipe 48 is connected to the interior of the flash tank 41 via the heat exchanger. The third circulation pipe 48 is sequentially equipped with a second shutoff valve 49 and a flash valve 50. The end of the third circulation pipe 48 is connected to a water spray pipe 42 located within the flash tank 41 and configured to spray hot steam into the flash tank 41. By controlling the flash valve 50, the high-temperature hot water in the third circulation pipe 48 enters the flash tank 41 for flash evaporation, thereby forming high-temperature steam and high-temperature water within the flash tank 41.

[0039] like Figure 1As shown, the steam supply pipeline specifically includes a steam outlet pipe 61, which is connected to the steam output port at the top of the flash tank 41. The steam outlet pipe 61 is provided with a fourth stop valve 62. The steam outlet pipe 61 is connected to a steam compressor 63, which is used to pressurize the steam generated by the flash tank 41. The steam compressor 63 is connected to a steam exhaust pipe 64, which is connected to the user end to provide high-temperature and high-pressure steam to the user. The steam exhaust pipe 64 is provided with a fifth stop valve 65.

[0040] like Figure 1 As shown, the steam supply pipeline also includes a steam bypass pipe 67, one end of which is connected to the steam outlet pipe 61 and the other end is connected to the steam exhaust pipe 64. The steam bypass pipe 67 is provided with a sixth shut-off valve 66. The steam bypass pipe 67 is used to directly supply the steam generated by the flash tank 41 to the user, providing relatively low-temperature and low-pressure steam.

[0041] The lower end of the flash tank 41 is connected to a drain pipe 52 , on which a third stop valve 51 is provided. The drain pipe 52 is used to discharge sewage or provide high-temperature water.

[0042] The lower end of the flash tank 41 is connected to the water vapor compressor 63 through the compressor spray pipe 68. The compressor spray pipe 68 is provided with a spray pump 69 and a flow regulating valve 70. The compressor spray pipe 68 replenishes water into the water vapor compressor 63, which can effectively reduce the exhaust superheat of the water vapor compressor 63, ensure the safe and stable operation of the unit, and improve the performance of the water vapor compressor 63.

[0043] The heat pump heating device in this embodiment is a cascade heat pump system, which is connected to the circulation pipeline of the flash evaporation device through a heat exchanger and is used to heat water in the circulation pipeline of the flash evaporation device.

[0044] like Figure 1 As shown, the cascade heat pump device includes a first-stage heat pump device and a second-stage heat pump device. The first-stage heat pump device includes a first evaporator 2, the first evaporator 2 is connected to a first compressor 6 through a first air inlet pipe 5, the first compressor 6 is connected to a first condenser 8 through a first air outlet pipe 7, the first condenser 8 is connected to a first expansion valve 10 through a first condensing pipe 9, and the first expansion valve 10 is connected to the first evaporator 2 through a first liquid return pipe 4, thereby forming a circulation pipeline of the first-stage heat pump device.

[0045] like Figure 1As shown, the two-stage heat pump device includes a first condenser 8 of a first-stage heat pump device, the first condenser 8 is connected to a second compressor 22 through a second air inlet pipe 21, the second compressor 22 is connected to a second condenser 24 through a second air outlet pipe 23, the second condenser 24 is connected to a second expansion valve 26 through a second condenser pipe 25, and the second expansion valve 26 is connected to the first condenser 8 through a second liquid return pipe 27, thereby forming a circulation pipeline of the two-stage heat pump device.

[0046] In this embodiment, the second circulation pipe 47 is connected to the second condenser 24, and the third circulation pipe 48 is connected to the flash valve 50 by the second condenser 24. Heat exchange is performed between the first-level heat pump device and the second-level heat pump device through the first condenser 8, and heat exchange is performed between the second-level heat pump device and the flash circulation pipeline of the flash system through the second condenser 24.

[0047] In one embodiment, Figure 1 As shown, a first air supply pipeline is provided in the first-stage heat pump device. Specifically, the first condenser pipe 9 is connected to the first air supply expansion valve 12 via the first pre-valve air supply pipe 11, and the first air supply expansion valve 12 is connected to the first compressor 6 via the first post-valve air supply pipe 13. The first air supply pipeline allows a portion of the condensed working fluid to flow through the first condenser pipe 9 and the first pre-valve air supply pipe 11, through the first air supply expansion valve 12, to expand, cool, and reduce pressure, and then flow into the first compressor 6 through the first post-valve air supply pipe 13. In the first compressor 6, the superheat of the compressed first-stage working fluid is absorbed and evaporated. The compressed working fluid is then discharged from the first compressor 6 and flows into the first condenser 8 through the first outlet pipe 7 to form a cycle, thereby achieving the effect of air supply and enthalpy increase.

[0048] Similarly, if Figure 1 As shown, a second air supply pipeline is provided in the two-stage heat pump device. Specifically, the second condenser pipe 25 is connected to the second air supply expansion valve 29 via the second pre-valve air supply pipe 28, and the second air supply expansion valve 29 is connected to the second compressor 22 via the second post-valve air supply pipe 30. The second air supply pipeline allows a portion of the condensed working fluid to flow through the second condenser pipe 25 and the pre-valve air supply pipe 28, through the second air supply expansion valve 29, where it is expanded, cooled, and reduced in pressure, before flowing into the second compressor 22 through the post-valve air supply pipe 30. In the second compressor 22, the compressed secondary working fluid absorbs the superheat and evaporates. The compressed working fluid is then discharged from the second compressor 22 and flows into the second condenser 24 through the second outlet pipe 23, forming a cycle, thereby also achieving the effect of air supply and enthalpy increase.

[0049] The feed water preheating device mentioned in this embodiment includes a first feed water preheater 34 and a second feed water preheater 46. The first feed water preheater 34 can be an external preheating device. The inlet end of the heat exchange side of the first feed water preheater 34 is connected to the high-temperature waste heat pipe 33, and the outlet end is connected to the low-temperature waste heat pipe 35. The second feed water preheater 46 is connected to the second circulation pipe 47 of the flash evaporation device. The first feed water preheater 34 and the second feed water preheater 46 are used to heat the feed water pipeline.

[0050] like Figure 1 As shown, the water supply pipeline of this embodiment includes a water supply pump 31, which is connected to the first water supply preheater 34 through a first water supply pipe 32. The first water supply preheater 34 is connected to the first condenser 8 through a second water supply pipe 36. The first condenser 8 is then connected to the second water supply preheater 46 through a third water supply pipe 37. The second water supply preheater 46 is connected to the second condenser 24 through a fourth water supply pipe 38. The second condenser 24 is connected to the first circulation pipe 44 of the flash evaporation device through a fifth water supply pipe 39, thereby supplying water to the flash evaporation device.

[0051] This embodiment utilizes the first feed water preheater 34 to utilize low-grade waste heat for the initial preheating of the feed water, raising the feed water temperature and reducing the system's operating energy consumption. The first condenser 8 utilizes the primary heat pump unit in the cascade heat pump heating device for the secondary preheating of the feed water. The primary heat pump unit provides a lower preheating temperature and consumes less energy, effectively reducing the system's overall energy consumption and increasing the feed water preheating temperature.

[0052] It is worth mentioning that the second make-up water preheater 46 of this embodiment is arranged on the circulation pipeline of the flash evaporation device upstream of the second condenser 24. By using the second make-up water preheater 46 and the high-temperature water after flash evaporation in the flash tank 41, the third preheating of the make-up water is achieved. On the one hand, the temperature of the make-up water is improved, and the impact of the low make-up water temperature on the stable operation of the system is reduced. On the other hand, the temperature of the circulating water flowing into the second condenser 24 is reduced, the heat exchange temperature difference of the second condenser 24 is increased, the required heat exchange area is reduced, the heat exchange efficiency is improved, and the equipment cost is reduced.

[0053] Furthermore, this embodiment achieves the fourth preheating of the make-up water by using the second condenser 24 and the secondary heat pump device in the cascade heat pump heating device. After the fourth preheating, the make-up water temperature is further improved and is added into the system at a temperature very close to the high-temperature hot water in the flash tank 41, thereby improving the make-up water temperature of the system and avoiding the impact of the low make-up water temperature on the stable operation of the system.

[0054] To sum up, the make-up water pipeline of this embodiment passes through the first make-up water preheater 34, the first condenser 8, the second make-up water preheater 46 and the second condenser 24 in sequence, realizing a stepped preheating of the make-up water temperature, making full use of waste heat energy, reducing the overall energy consumption of the system, and being conducive to improving steam generation efficiency.

[0055] The working principle of this embodiment is as follows:

[0056] When the system is working normally, the heat pump heating device works first, wherein the first-stage heat pump device works, and the waste heat flows into the first evaporator 2 through the waste heat inlet pipe 1, and then flows out through the waste heat outlet pipe 3, heating the first-stage working medium in the first evaporator 2 to evaporate it, and the evaporated first-stage working medium flows into the first compressor 6 through the first air inlet pipe 5 to be compressed, and then flows into the first condenser 8 through the first air outlet pipe 7, and the first-stage working medium condenses in the first condenser 8 to release heat and heat the second-stage working medium to evaporate it, and at the same time heats the supplementary water in the first condenser 8 to increase its temperature. A portion of the primary working fluid flows through the first condenser pipe 9, through the first expansion valve 10, and then expands, cools, and reduces pressure. After that, it flows back into the first evaporator 2 through the first return liquid pipe 4, forming a cycle. Another portion flows through the first condenser pipe 9 and the first valve front air supply pipe 11, through the first air supply expansion valve 12, and then expands, cools, and reduces pressure. After that, it flows into the first compressor 6 through the first valve rear air supply pipe 13. In the first compressor 6, it absorbs the superheat of the compressed primary working fluid and evaporates. Then, it is compressed and discharged from the first compressor 6, and flows into the first condenser 8 through the first outlet pipe 7, forming a cycle, achieving the effect of air supply and enthalpy increase. The circulation path of the two-stage heat pump device and the one-stage heat pump device is basically the same. The secondary working fluid absorbs the condensation heat of the primary working fluid and evaporates in the first condenser 8. In the second condenser 24, it condenses and releases heat to heat the water working fluid from the second circulation pipe 47 in the flash evaporation device, raising its temperature. At the same time, it also heats the make-up water in the second condenser 24, raising its temperature.

[0057] In this embodiment, the waste heat from the high-temperature waste heat pipe 33 may be the same as or different from the waste heat from the waste heat inlet pipe 1 , depending on actual conditions.

[0058] In this embodiment, the make-up water pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the first make-up water preheater 34, the heat exchange side of the first condenser 8, the heat exchange side of the second make-up water preheater 46, and the heat exchange side of the second condenser 24 in sequence, thereby realizing four-stage temperature increase. The make-up water from the outside flows through the first make-up water pipe 32, the make-up water pump 31, and flows into the first make-up water preheater 34. In the first make-up water preheater 34, it is heated for the first time by the waste heat from the high-temperature waste heat pipe 33. Then, it flows into the first condenser 8 through the second make-up water pipe 36 and is heated for the second time. Then, it flows into the second make-up water preheater 46 through the third make-up water pipe 37 and is heated for the third time by the high-temperature water working medium in the flash tank 41 of the first circulation pipe 44. Finally, it flows into the second condenser 24 through the fourth make-up water pipe 38 and is heated for the fourth time. After the four preheating steps are completed, it flows into the first circulation pipe 44 through the fifth make-up water pipe 39, thereby realizing high-temperature make-up water in the flash evaporation system.

[0059] When the flash device is operating, the first stop valve 43 and the second stop valve 49 are opened. The high-temperature water medium in the flash tank 41 is mixed with the make-up water from the fifth make-up water pipe 39 in the first circulation pipe 44, then flows through the first circulation pipe 44, passes through the circulating heating water pump 45, and flows into the second make-up water preheater 46. In the second make-up water preheater 46, it releases heat and cools down to heat the make-up water from the third make-up water pipe 37. Then, it flows into the second condenser 24 through the second circulation pipe 47, is heated by the heat released by the condensation of the secondary working medium in the second condenser 24, reaches a high temperature state, and then flows through the third circulation pipe 48, passes through the second stop valve 49, the flash valve 50, and the water spray pipe 42, and flows into the flash tank 41. In the flash tank 41, it is depressurized and flash evaporated to produce steam with a lower temperature and pressure.

[0060] There are two steam supply modes to choose from when the steam supply pipeline is working:

[0061] When the first steam supply mode is working, the fourth stop valve 62, the fifth stop valve 65, and the sixth stop valve 66 are closed, and the steam with lower temperature and pressure generated in the flash tank 41 flows through the steam outlet pipe 61, through the fourth stop valve 62, and into the steam compressor 63. After being compressed, the temperature and pressure are increased to reach a higher temperature and pressure, and then the steam flows through the steam exhaust pipe 64, through the fifth stop valve 65, and is supplied to users for use.

[0062] At the same time, when the first steam supply mode is working, the flow regulating valve 70 is opened. At this time, the high-temperature water in the flash tank 41 flows through the compressor spray pipe 68, the spray pump 69 and the flow regulating valve 70 and is sprayed into the compression chamber of the water vapor compressor 63. The water is sprayed in the compression chamber to achieve atomization and absorption of the temperature and pressure of the compressed water vapor, thereby reducing the exhaust superheat of the final compressor and ensuring the safe and stable operation of the system.

[0063] When the second steam supply mode is working, the fourth stop valve 62 and the flow regulating valve 70 are closed, the fifth stop valve 65 and the sixth stop valve 66 are opened, and steam with lower temperature and pressure is supplied to users through the steam outlet pipe 61, the steam bypass pipe 67 and the steam exhaust pipe 64.

[0064] This embodiment uses heat pump technology to provide heating, which can achieve the supply of low-pressure steam and high-temperature hot water. Based on the coupling of a water vapor compressor, it can also achieve the supply of high-temperature and high-pressure steam, meeting the various heating needs of users. Heat pumps can be various forms such as air source heat pumps, waste heat source heat pumps, and geothermal source heat pumps. They effectively utilize the large amount of air energy, low-grade waste heat energy, and geothermal energy in the air, reducing the consumption of high-quality energy and achieving energy conservation. In addition, using heat pump technology to provide heating to generate steam and domestic hot water effectively avoids the use of coal-fired boilers, eliminates the emission of coal-fired boiler flue gas, and achieves the effect of protecting the environment.

[0065] Example 2

[0066] This embodiment provides a stepped heating heat pump steam supply system, which is the same as the above embodiment, except that the first make-up water preheater 34 can be eliminated and the heat pump heating device can also be non-cascaded, which is a simplification of the above embodiment.

[0067] like Figure 2 As shown, the second water supply pipe 36 of the water supply pipeline is directly connected to the second water supply preheater 46, and the heat pump heating device only adopts a two-stage heat pump device, and the evaporator of the two-stage heat pump device is connected to the corresponding waste heat pipeline.

[0068] The feed water pipeline of this embodiment is heated by the second feed water preheater 46 and the second condenser 24 in sequence, and can also achieve step-by-step preheating of the feed water temperature, thereby fully utilizing waste heat energy and reducing system energy consumption.

[0069] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A step-by-step heating heat pump steam supply system, characterized in that: include: a flash evaporation unit to generate steam and water; a steam supply pipeline connected to the output end of the flash evaporation device for processing steam; a heat pump heating device connected to the circulation pipeline of the flash evaporation device through a heat exchanger, and used to heat water in the circulation pipeline of the flash evaporation device; Make-up water preheating device; A water supply pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the water supply preheating device and the heat exchange side of the heat exchanger, so as to provide preheated water to the circulation pipeline of the flash evaporation device through heating of the water supply preheating device and the heat exchanger.

2. The step-by-step temperature increase heat pump steam supply system according to claim 1, characterized in that: The water replenishment preheating device includes a first water replenishment preheater (34) and a second water replenishment preheater (46); The second water-making preheater (46) is provided on a circulation pipeline of the flash evaporation device upstream of the heat exchanger, and the water-making pipeline is connected to the first water-making preheater (34) and the second water-making preheater (46) in sequence.

3. The step-by-step temperature increase heat pump steam supply system according to claim 2, characterized in that: The heat pump heating device is a cascade heat pump device, which includes a primary heat pump device and a secondary heat pump device. The heat exchanger includes a first condenser (8) of the primary heat pump device and a second condenser (24) of the secondary heat pump device. The primary heat pump device is connected to the secondary heat pump device via the first condenser (8), and the secondary heat pump device is connected to the circulation pipeline of the flash evaporation device via the second condenser (24). The water supply pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the second condenser (24).

4. The step-by-step temperature increase heat pump steam supply system according to claim 3, characterized in that: The water supply pipeline is connected to the circulation pipeline of the flash evaporation device through the heat exchange side of the first water supply preheater (34), the heat exchange side of the first condenser (8), the heat exchange side of the second water supply preheater (46) and the heat exchange side of the second condenser (24) in sequence.

5. The step-by-step temperature increase heat pump steam supply system according to claim 4, characterized in that: The flash evaporation device comprises a flash tank (41) and a flash evaporation circulation pipeline connected to the flash tank (41); the flash evaporation circulation pipeline is sequentially connected to a circulating heating water pump (45), the second water supply preheater (46), the second condenser (24) and a flash valve (50); the water supply pipeline is connected to the pipeline between the flash tank (41) and the circulating heating water pump (45).

6. The step-by-step temperature increase heat pump steam supply system according to claim 5, characterized in that: The steam supply pipeline comprises a steam outlet pipe (61) and a steam bypass pipe (67) connected to the steam output end of the flash tank (41); a steam compressor (63) is provided on the steam outlet pipe (61) for pressurizing steam to generate high-pressure steam.

7. The step-by-step temperature increase heat pump steam supply system according to claim 6, characterized in that: The invention also includes a liquid spraying device, which includes a liquid spraying pipeline and a liquid spraying pump (69). The input end of the liquid spraying pipeline is connected to the flash tank (41), and the output end of the liquid spraying pipeline is connected to the water vapor compressor (63), so as to spray the water in the flash tank (41) into the water vapor compressor (63).

8. The step-by-step temperature increase heat pump steam supply system according to claim 3, characterized in that: The primary heat pump device comprises a first evaporator (2), a first compressor (6), a first condenser (8) and a first expansion valve (10) which are sequentially connected via a first heat pump circulation pipeline, wherein the first heat pump circulation pipeline between the first condenser (8) and the first expansion valve (10) is connected to the first compressor (6) via a first air supply pipe.

9. The step-by-step temperature increase heat pump steam supply system according to claim 8, characterized in that: The two-stage heat pump device comprises a second compressor (22), a second condenser (24) and a second expansion valve (26) which are connected in sequence through a second heat pump circulation pipeline, wherein an upstream pipeline of the second compressor (22) passes through the first condenser (8), and the second heat pump circulation pipeline between the second condenser (24) and the second expansion valve (26) is connected to the second compressor (22) through a second air supply pipe.

10. The step-by-step temperature increase heat pump steam supply system according to claim 2, characterized in that: One heat exchange side of the first water supply preheater (34) is connected to the water supply pipeline, and the other heat exchange side of the first water supply preheater (34) is connected to the high-temperature waste heat pipeline.

Images