A hot water to steam system

Abstract

The application discloses a hot water steam production system, which solves the problem of low efficiency of the existing steam production equipment. The hot water steam production system comprises a steam generation unit, a first compressor unit and a heat pump unit. The heat pump unit comprises K heat pumps, K>=1, and the K heat pumps are connected in series and / or in parallel when K>=2. Flash water is input into the heat pump unit from the steam generation unit. The heat pump unit absorbs external heat energy to heat the flash water. The heated flash water returns to the steam generation unit to generate steam. The steam is input into the first compressor unit, and the first compressor unit outputs the steam after compression. The heat pump unit can effectively utilize the heat energy carried by the hot water, and significantly improves the efficiency of the steam production equipment.

Description

Technical Field

[0001] This invention relates to the field of industrial steam supply technology, specifically to a hot water steam generation system. Background Technology

[0002] Industrial users account for over 65% of my country's final energy consumption. Steam is used in many industrial sectors, such as chemical, food, and textile industries, for processes like distillation and drying, resulting in enormous energy consumption. Currently, industrial users still primarily rely on boilers, especially coal-fired boilers, to produce steam. This method directly consumes fossil fuels, leading to substantial carbon and pollution emissions. Furthermore, this method requires the production of high-temperature steam before it is delivered to users for throttling and pressure reduction, resulting in significant irreversible losses. In recent years, with the gradual phasing out of coal-fired boilers, there is an urgent need to find alternative methods to meet the steam demands of industrial users.

[0003] Utilizing existing hot water pipe networks for hot water delivery and producing steam at industrial user terminals using steam generation equipment can replace industrial coal-fired steam boilers, enabling long-distance heat transfer. However, existing steam generation equipment is inefficient and cannot effectively utilize the heat energy carried by the hot water, resulting in significant heat loss and failing to achieve energy conservation and environmental protection goals. Summary of the Invention

[0004] In order to solve the problems in the prior art, the purpose of this application is to provide a hot water steam generation system for producing industrial steam, which significantly improves the efficiency of steam production equipment.

[0005] To achieve the above technical objectives, this application adopts the following technical solution:

[0006] This application provides a hot water steam generation system, including a steam generating unit, a first compressor unit, and a heat pump unit. The heat pump unit includes a K-stage heat pump, where K≥1 and K≥2 are connected in series and / or in parallel. Flash water is input from the steam generating unit to the heat pump unit, where the heat pump unit absorbs external heat energy to heat the flash water. After being heated, the flash water returns to the steam generating unit, where steam is generated. The steam is then input to the first compressor unit, which compresses the steam and outputs it.

[0007] Optionally, the heat pump includes a generator, a condenser, an evaporator, and an absorber. The generator is connected to a high-temperature water supply pipe, and the evaporator is connected to a low-temperature water return pipe. External high-temperature water is input into the generator, releases heat, and is then input into the evaporator. After releasing heat again, the water is output from the evaporator to the heat pump.

[0008] Optionally, a first circulation pipe is connected between the steam generating unit and the absorber, a second circulation pipe is connected between the absorber and the condenser, and a third circulation pipe is connected between the condenser and the steam generating unit. The flash water is input into the absorber through the first circulation pipe, absorbs heat in the absorber, is input into the condenser through the second circulation pipe, absorbs heat again in the condenser, and returns to the steam generating unit through the third circulation pipe.

[0009] The first compressor unit includes a single-stage compressor or a multi-stage compressor, wherein the multi-stage compressors are connected in series or in parallel.

[0010] Optionally, the heat pump includes a generator, an evaporator, and an absorber. The generator is connected to a high-temperature water supply pipe, and the evaporator is connected to a low-temperature water return pipe. External high-temperature water is input into the generator, releases heat, and is then input into the evaporator. After releasing heat again, the water is output from the evaporator to the heat pump.

[0011] Optionally, a first circulation pipe is connected between the steam generating unit and the absorber, and a third circulation pipe is connected between the absorber and the steam generating unit. The flash water is input into the absorber through the first circulation pipe, absorbs heat in the absorber, and then returns to the steam generating unit through the third circulation pipe.

[0012] It also includes a second compressor unit, to which steam generated from the generator is output, and the second compressor unit compresses the steam before outputting it.

[0013] Optionally, it also includes a heat exchanger, which is connected to the generator via a fourth circulation pipe, to the evaporator via a fifth circulation pipe, to the first circulation pipe via a branch pipe, and to the third circulation pipe via a sixth circulation pipe. The high-temperature water delivered from the generator to the evaporator passes through the heat exchanger, and a portion of the flash water is input into the heat exchanger. After being heated in the heat exchanger, it returns to the steam generating unit, where steam is generated.

[0014] Optionally, the steam generating unit includes a single-stage flash evaporator, which includes a flash water inlet, a flash water outlet, and a steam outlet. The flash water inlet is connected to the heat pump unit through a third circulation pipe, the flash water outlet is connected to the heat pump unit through a first circulation pipe, and the steam outlet is connected to the first compressor unit.

[0015] Optionally, the steam generating unit includes N-stage flash evaporators, where N≥2, and the N-stage flash evaporators are connected in series. Each flash evaporator includes a flash water inlet, a flash water outlet, and a steam outlet. The flash water inlet of the M-th stage flash evaporator (excluding the first stage flash evaporator) is connected to the flash water outlet of the (M-1)-th stage flash evaporator, where 2≤M≤N. The flash water inlet of the first stage flash evaporator is connected to the heat pump unit through a third circulation pipe, and the flash water outlet of the last stage flash evaporator is connected to the heat pump unit through a first circulation pipe. The steam outlet is connected to the first compressor unit.

[0016] Optionally, the first compressor unit and the second compressor unit may include a single-stage compressor or a multi-stage compressor, wherein the multi-stage compressors are connected in series or in parallel.

[0017] Optionally, it also includes a water replenishment pipe, the outlet of which is connected to the first circulation pipe or the third circulation pipe, and the replenishment water is converted into flash evaporation water.

[0018] Optionally, it also includes a high-temperature tank, a secondary heat exchanger, and a secondary flash evaporator. The high-temperature tank includes a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet and the first outlet are connected to the secondary heat exchanger, and the second inlet and the second outlet are connected to the secondary flash evaporator. The secondary heat exchanger and the secondary flash evaporator are respectively connected to the first compressor unit.

[0019] As can be seen from the above technical solution, this application provides a hot water steam generation system, which has the following advantages:

[0020] This application, by setting up a heat pump unit, can effectively utilize the heat energy carried by hot water, significantly improving the efficiency of steam production equipment and achieving the goal of energy conservation and environmental protection.

[0021] This application utilizes hot water user terminals to directly generate steam. The equipment can be distributed and the parameters of the generated steam can be directly matched with the steam-using equipment, thereby reducing steam transmission losses and throttling losses. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hot water steam generation system of Embodiment 1 of this application;

[0023] Figure 2 This is a schematic diagram of the hot water steam generation system of Embodiment 2 of this application;

[0024] Figure 3 This is a schematic diagram of the hot water steam generation system of Embodiment 3 of this application;

[0025] Figure 4 This is a schematic diagram of the hot water steam generation system of Embodiment 4 of this application;

[0026] Figure 5This is a schematic diagram of the hot water steam generation system of Embodiment 5 of this application;

[0027] Figure 6 This is a schematic diagram of the hot water steam generation system of Embodiment 6 of this application;

[0028] Figure 7 This is a schematic diagram of the hot water steam generation system of Embodiment 7 of this application;

[0029] Figure 8 This is a schematic diagram of the hot water steam generation system of Embodiment 8 of this application;

[0030] Figure 9 This is a schematic diagram of the hot water steam generation system of Embodiment 9 of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Steam generating unit; 1-1. First-stage flash evaporator; 1-2. Second-stage flash evaporator; 1-N. Nth-stage flash evaporator; 2. First compressor unit; 2-1. First-stage compressor; 2-2. Second-stage compressor; 2-N. Nth-stage compressor; 3. Heat pump unit; 3-1. Generator; 3-2. Condenser; 3-3. Evaporator; 3-4. Absorber; 30-1. First-stage heat pump; 30-2. Second-stage heat pump; 30- K, K-stage heat pump; 4, heat exchanger; 5, high-temperature water supply pipeline; 6, fourth circulation pipeline; 7, fifth circulation pipeline; 8, low-temperature return water pipeline; 9, first circulation pipeline; 10, branch pipeline; 11, sixth circulation pipeline; 12, second circulation pipeline; 13, third circulation pipeline; 14, makeup water pipeline; 15, condensate recovery pipeline; 16, second compressor unit; 17, high-temperature tank; 18, auxiliary heat exchanger; 19, auxiliary flash evaporator; 20, low-temperature tank. Detailed Implementation

[0032] To better understand the purpose, structure, and function of this application, a hot water steam generation system and method of this application will be described in further detail below with reference to the accompanying drawings.

[0033] Example 1

[0034] like Figure 1 The illustration shows Embodiment 1 of this application, which provides a hot water steam generation system, including a steam generating unit 1, a first compressor unit 2, and a heat pump unit 3. The heat pump unit 3 includes a K-stage heat pump, where K≥1 and K≥2 are connected in series and / or in parallel. Flash water is input from the steam generating unit 1 into the heat pump unit 3. The heat pump unit 3 absorbs external heat energy to heat the flash water. After being heated, the flash water returns to the steam generating unit 1, where steam is generated. The steam is input into the first compressor unit 2, which compresses the steam and outputs it.

[0035] The heat pump unit 3 absorbs external heat energy, which can come from hot water pipe networks or waste heat generated by various heavy industrial users, and is delivered in the form of high-temperature hot water.

[0036] In this embodiment, the heat pump unit 3 includes a primary heat pump, which is an absorption heat pump. The heat pump includes a generator 3-1, a condenser 3-2, an evaporator 3-3, and an absorber 3-4. The generator 3-1 is connected to a high-temperature water supply pipe 5, and the evaporator 3-3 is connected to a low-temperature water return pipe 8. External high-temperature water is input into the generator 3-1, and after releasing heat, it is input into the evaporator 3-3 from the generator 3-1. After releasing heat again, it is output from the evaporator 3-3 to the heat pump unit 3.

[0037] A first circulation pipe 9 connects the steam generating unit 1 to the absorber 3-4, a second circulation pipe 12 connects the absorber 3-4 to the condenser 3-2, and a third circulation pipe 13 connects the condenser 3-2 to the steam generating unit 1. Flash water enters the absorber 3-4 through the first circulation pipe 9, absorbs heat in the absorber 3-4, enters the condenser 3-2 through the second circulation pipe 12, absorbs heat again in the condenser 3-2, and returns to the steam generating unit 1 through the third circulation pipe 13.

[0038] like Figure 1 As shown, the hot water steam generation system also includes a heat exchanger 4. The heat exchanger 4 is connected to the generator 3-1 through a fourth circulation pipe 6, to the evaporator 3-3 through a fifth circulation pipe 7, to the first circulation pipe 9 through a branch pipe 10, and to the third circulation pipe 13 through a sixth circulation pipe 11. The high-temperature water transported from the generator 3-1 to the evaporator 3-3 passes through the heat exchanger 4. Part of the flash water is input into the heat exchanger 4, heated in the heat exchanger 4, and then returned to the steam generation unit 1, where steam is generated.

[0039] By installing heat exchanger 4, the heating rate of flash water can be increased, thereby improving the steam production efficiency.

[0040] In this embodiment, the steam generating unit 1 includes a single-stage flash evaporator, which includes a flash water inlet, a flash water outlet, and a steam outlet. The flash water inlet is connected to the heat pump unit 3 through a third circulation pipe 13, the flash water outlet is connected to the heat pump unit 3 through a first circulation pipe 9, and the steam outlet is connected to the first compressor unit 2.

[0041] In this embodiment, the first compressor unit 2 includes a single-stage compressor. The compressor includes a steam inlet and a steam outlet. The steam inlet of the compressor is connected to the steam outlet of the flash evaporator, and the steam outlet of the compressor is connected to the user's steam pipeline.

[0042] like Figure 1As shown, the hot water steam generation system also includes a water supply pipe 14, the outlet of which is connected to the first circulation pipe 9, where the water supply is converted into flash water. As steam production continues, the flash water in the flash evaporator decreases, and flash water can be replenished to the flash evaporator through the water supply pipe 14 to achieve continuous steam production.

[0043] The outlet of the water supply pipe 14 can also be connected to the third circulation pipe 13, which is fed into the flash evaporator from the flash water inlet. Preferably, the water supply is preheated at this time to increase the temperature of the water supply. After being fed into the flash evaporator, steam can be produced.

[0044] The specific structure of the flash evaporator and compressor can be referenced from existing technologies.

[0045] Example 2

[0046] like Figure 2 The above is an embodiment 2 of this application. In this embodiment, the heat pump unit 3 includes a primary heat pump, which is an absorption heat pump. The heat pump includes a generator 3-1, an evaporator 3-3, and an absorber 3-4. A condenser 3-2 is not required. The generator 3-1 is connected to a high-temperature water supply pipe 5, and the evaporator 3-3 is connected to a low-temperature water return pipe 8. High-temperature water from the outside is input into the generator 3-1, and after releasing heat, it is input into the evaporator 3-3 from the generator 3-1. After releasing heat again, it is output from the evaporator 3-3 to the heat pump unit 3.

[0047] A first circulation pipe 9 is connected between the steam generating unit 1 and the absorber 3-4, and a third circulation pipe 13 is connected between the absorber 3-4 and the steam generating unit 1. Flash water is input into the absorber 3-4 through the first circulation pipe 9, and after absorbing heat in the absorber 3-4, it returns to the steam generating unit 1 through the third circulation pipe 13.

[0048] like Figure 2 As shown, the hot water steam generation system also includes a second compressor unit 16. Steam generated from generator 3-1 is output to the second compressor unit 16, which compresses the steam before outputting it. By extracting the steam from generator 3-1, it can be used as part of the product steam.

[0049] In this embodiment, the second compressor unit 16 includes a single-stage compressor. The compressor includes a steam inlet and a steam outlet. The steam inlet of the compressor is connected to the steam outlet of the heat pump unit 3, and the steam outlet of the compressor is connected to the user's steam pipeline.

[0050] Example 3

[0051] like Figure 3 The image shown is Embodiment 3 of this application. In this embodiment, the first compressor unit 2 includes a multi-stage compressor.

[0052] The first compressor unit 2 may include N-stage compressors, where N ≥ 2. The N-stage compressors are connected in series, and steam passes through the N-stage compressors in sequence. Each compressor includes a steam outlet, a steam inlet, and a condensate outlet.

[0053] To facilitate steam compression, a cooling device can be installed at the steam outlet of the compressors other than the last stage compressor. For example, water spraying or air blowing can be used to cool the outlet. Cooling and reducing the temperature is beneficial for compression and reduces compression power consumption.

[0054] The condensate outlet is connected to the inlet of the condensate recovery pipe 15, and the outlet of the condensate recovery pipe 15 is connected to the first circulation pipe 9. The condensate formed in the compressor is input into the first circulation pipe 9 through the condensate recovery pipe 15 and converted into flash water to realize condensate recovery.

[0055] By setting up a multi-stage compressor, the compression ratio of steam can be increased, thereby increasing the temperature and pressure of the steam and meeting the specific needs of users.

[0056] Example 4

[0057] like Figure 4 The following is an embodiment 4 of this application. In this embodiment, the steam generating unit 1 includes N-stage flash evaporators, where N≥2. The N-stage flash evaporators are connected in series. Each flash evaporator includes a flash water inlet, a flash water outlet, and a steam outlet. The flash water inlet of the M-th stage flash evaporator (excluding the first stage flash evaporator) is connected to the flash water outlet of the (M-1)-th stage flash evaporator, where 2≤M≤N. The flash water inlet of the first stage flash evaporator is connected to the heat pump unit 3 through the third circulation pipe 13. Figure 4 (The heat pump unit 3 is not shown in the diagram). The flash water outlet of the last-stage flash evaporator is connected to the heat pump unit 3 through the first circulation pipe 9, and the steam outlet is connected to the first compressor unit 2.

[0058] In this embodiment, the first compressor unit 2 includes a multi-stage compressor, which is connected in parallel.

[0059] from Figure 4 As can be seen from the diagram, the steam generating unit 1 includes: a first-stage flash evaporator 1-1, a second-stage flash evaporator 1-2, ..., an Nth-stage flash evaporator 1-N. The first compressor unit 2 includes: a first-stage compressor 2-1, a second-stage compressor 2-2, ..., an Nth-stage compressor 2-N.

[0060] The compressor includes a steam inlet and a steam outlet. The steam inlet of the M-stage compressor is connected to the steam outlet of the M-stage flash evaporator, and the steam outlet of the M-stage compressor is connected to the user's steam pipeline. Similarly, the steam inlet of the first-stage compressor is connected to the steam outlet of the first-stage flash evaporator, and the steam outlet of the first-stage compressor is connected to the user's steam pipeline.

[0061] N-stage flash evaporators are connected in series. Flash water passes through the N-stage flash evaporators in sequence. In each stage of the flash evaporator, the flash water can produce steam. The steam is then compressed by a compressor to achieve the predetermined temperature and pressure to meet different user needs.

[0062] By setting up an N-stage flash evaporator and an N-stage compressor, steam can be provided to multiple users. The equipment can be distributed in a decentralized manner, and the parameters of the steam production can be directly matched with the steam-using equipment, thereby reducing steam transmission losses and throttling losses.

[0063] Example 5

[0064] like Figure 5 The image shown is Embodiment 5 of this application. In this embodiment, the first compressor unit 2 includes a multi-stage compressor, which is connected in series.

[0065] The steam inlet of the M-stage compressor is connected to the steam outlet of the M-stage flash evaporator. Meanwhile, the steam outlet of the M-stage compressor (excluding the first-stage compressor) is connected to the steam inlet of the M-1-stage compressor, and the steam outlet of the first-stage compressor is connected to the user's steam pipeline.

[0066] This setting allows for an increase in the compression ratio of steam, thereby increasing the temperature and pressure of the steam to meet specific user needs.

[0067] To facilitate steam compression, a cooling device can be installed at the steam outlet of the Mth stage compressor (excluding the first stage compressor). For example, water spraying or air blowing can be used to cool the outlet. Cooling and reducing the temperature is beneficial for compression and reduces compression power consumption.

[0068] Example 6

[0069] like Figure 6 The following is an embodiment of this application. In this embodiment, multi-stage compressors are connected in series. The first compressor unit 2 includes multi-stage compressors, which are connected in series.

[0070] In this embodiment, the flash evaporator includes a flash water inlet, a flash water outlet, a steam outlet, and a steam inlet. The flash water inlet of the Mth stage flash evaporator (excluding the first stage flash evaporator) is connected to the flash water outlet of the (M-1)th stage flash evaporator. The flash water inlet of the first stage flash evaporator is connected to the heat pump unit 3 through the third circulation pipe 13. Figure 6 (The heat pump unit 3 is not shown in the diagram). The flash water outlet of the last-stage flash evaporator is connected to the heat pump unit 3 through the first circulation pipe 9, and the steam outlet is connected to the first compressor unit 2.

[0071] The compressor includes a steam inlet and a steam outlet. The steam inlet of the M-stage compressor is connected to the steam outlet of the M-stage flash evaporator. The steam outlet of the M-stage compressor (excluding the first-stage compressor) is connected to the steam inlet of the M-1-stage flash evaporator. The steam outlet of the first-stage compressor is connected to the user's steam pipeline.

[0072] This setting allows for an increase in the compression ratio of steam, thereby increasing the temperature and pressure of the steam to meet specific user needs.

[0073] Example 7

[0074] like Figure 7 The above is embodiment 7 of this application. In this embodiment, the heat pump unit 3 includes K-stage heat pumps, where K ≥ 2. The K-stage heat pumps are connected in series. By setting up multiple stages of heat pumps, heat energy from the hot water pipe network can be further absorbed, the temperature of the flash water can be increased, and the temperature of the system drainage can be reduced.

[0075] from Figure 7 As can be seen from the diagram, heat pump unit 3 includes: first-stage heat pump 30-1, second-stage heat pump 30-2, ..., Kth-stage heat pump 30-K. Steam generation unit 1 includes only one-stage flash evaporator. First compressor unit 2 includes: first-stage compressor 2-1, second-stage compressor 2-2, ..., Nth-stage compressor 2-N.

[0076] The heat pump can adopt the structure described in Example 1. In this case, the heat pump includes a generator 3-1, a condenser 3-2, an evaporator 3-3, and an absorber 3-4. When the K-stage heat pumps are connected in series, the inlet of the generator 3-1 of the first-stage heat pump is connected to the high-temperature water supply pipe 5, the outlet of the evaporator 3-3 of the first-stage heat pump is connected to the inlet of the generator 3-1 of the next-stage heat pump, and the outlet of the evaporator 3-3 of the last-stage heat pump is connected to the low-temperature return water pipe 8. Through this connection, the high-temperature water from the outside can pass through the K-stage heat pumps in sequence.

[0077] The outlet of the condenser 3-2 of the first-stage heat pump is connected to the third circulation pipe 13, the inlet of the absorber 3-4 of the first-stage heat pump is connected to the outlet of the condenser 3-2 of the next-stage heat pump, and the inlet of the absorber 3-4 of the last-stage heat pump is connected to the first circulation pipe 9. Through this connection, the flash water in the steam generating unit 1 can pass through the K-stage heat pump in sequence.

[0078] The heat pump can also adopt the structure described in Embodiment 2. In this case, the heat pump includes a generator 3-1, an evaporator 3-3, and an absorber 3-4. When the K-stage heat pumps are connected in series, the inlet of the generator 3-1 of the first-stage heat pump is connected to the high-temperature water supply pipe 5, the outlet of the evaporator 3-3 of the first-stage heat pump is connected to the inlet of the generator 3-1 of the next-stage heat pump, and the outlet of the evaporator 3-3 of the last-stage heat pump is connected to the low-temperature return water pipe 8. Through this connection, the high-temperature water from the outside can pass through the K-stage heat pumps in sequence.

[0079] The outlet of the absorber 3-4 of the first-stage heat pump is connected to the third circulation pipe 13, the inlet of the absorber 3-4 of the first-stage heat pump is connected to the outlet of the condenser 3-2 of the next-stage heat pump, and the inlet of the absorber 3-4 of the last-stage heat pump is connected to the first circulation pipe 9. Through this connection, the flash water in the steam generating unit 1 can pass through the K-stage heat pump in sequence.

[0080] In this embodiment, the outlet of the water supply pipe is connected to the third circulation pipe 13, and the water is fed into the flash evaporator from the flash water inlet of the flash evaporator.

[0081] Example 8

[0082] like Figure 8 The above is embodiment 8 of this application. In this embodiment, the heat pump unit 3 includes K-stage heat pumps, where K ≥ 2. The K-stage heat pumps are connected in parallel. By setting up multiple stages of heat pumps, heat energy from the hot water pipe network can be further absorbed, the temperature of the flash water can be increased, and the temperature of the system drainage can be reduced.

[0083] from Figure 8 As can be seen from the diagram, heat pump unit 3 includes: first-stage heat pump 30-1, second-stage heat pump 30-2, ..., Kth-stage heat pump 30-K. Steam generation unit 1 includes only one-stage flash evaporator. First compressor unit 2 includes: first-stage compressor 2-1, second-stage compressor 2-2, ..., Nth-stage compressor 2-N.

[0084] The heat pump can adopt the structure described in Example 1. In this case, the heat pump includes a generator 3-1, a condenser 3-2, an evaporator 3-3, and an absorber 3-4. When the K-stage heat pumps are connected in parallel, the inlet of the generator 3-1 of the first-stage heat pump is connected to the high-temperature water supply pipe 5, the outlet of the evaporator 3-3 of the first-stage heat pump is connected to the inlet of the generator 3-1 of the next-stage heat pump, and the outlet of the evaporator 3-3 of the last-stage heat pump is connected to the low-temperature return water pipe 8. Through this connection, the high-temperature water from the outside can pass through the K-stage heat pumps in sequence.

[0085] The outlet of the condenser 3-2 of each stage heat pump can be connected to the third circulation pipe 13, and the inlet of the absorber 3-4 of each stage heat pump can be connected to the first circulation pipe 9.

[0086] The heat pump can also adopt the structure described in Embodiment 2. In this case, the heat pump includes a generator 3-1, an evaporator 3-3, and an absorber 3-4. When the K-stage heat pumps are connected in parallel, the inlet of the generator 3-1 of the first-stage heat pump is connected to the high-temperature water supply pipe 5, the outlet of the evaporator 3-3 of the first-stage heat pump is connected to the inlet of the generator 3-1 of the next-stage heat pump, and the outlet of the evaporator 3-3 of the last-stage heat pump is connected to the low-temperature return water pipe 8. Through this connection relationship, the high-temperature water from the outside can pass through the K-stage heat pumps in sequence.

[0087] The outlet of the absorber 3-4 of each stage of the heat pump can be connected to the third circulation pipe 13, and the inlet of the absorber 3-4 of each stage of the heat pump can be connected to the first circulation pipe 9.

[0088] In this embodiment, the outlet of the water supply pipe is connected to the third circulation pipe 13, and the water is fed into the flash evaporator from the flash water inlet of the flash evaporator.

[0089] If a Class K heat pump uses both series and parallel connections, it means that some of the heat pumps are connected in series and the rest are connected in parallel. For detailed structure, please refer to the above embodiments, which will not be described in detail here.

[0090] Example 9

[0091] like Figure 9 The figure shown is Embodiment 9 of this application. In this embodiment, the system further includes a high-temperature tank 17, an auxiliary heat exchanger 18, and an auxiliary flash evaporator 19. The high-temperature tank 17 includes a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet and the first outlet are connected to the auxiliary heat exchanger 18, and the second inlet and the second outlet are connected to the auxiliary flash evaporator 19. The auxiliary heat exchanger 18 and the auxiliary flash evaporator 19 are respectively connected to the first compressor unit 2.

[0092] The system may also include a cryogenic tank 20, see reference. Figure 7 , Figure 8 As shown, the cryogenic tank 20 includes a first inlet and a second inlet and a third inlet. The first inlet and the third inlet are connected to the high-temperature water supply pipe 5, and the second inlet and the third inlet are connected to the cryogenic return water pipe 8.

[0093] When the power grid is in a low-demand period, electricity prices are relatively low, allowing the system to increase steam production. This steam is then stored as heat in the high-temperature tank 17 via the auxiliary heat exchanger 18. At this time, hot water transported from outside and hot water stored in the low-temperature tank 20 are simultaneously supplied to the system.

[0094] When the power grid is in peak demand and electricity prices are high, the system can reduce steam production. High-temperature tank 17 outputs hot steam through auxiliary flash evaporator 19. The hot steam is then input into compressor unit 2 for compression, and output to users after reaching the required pressure, thereby reducing steam production costs. At this time, long-distance hot water transported from outside can be transported to low-temperature tank 20 for storage.

[0095] When the power grid is in normal operation, neither the cryogenic tank 20 nor the high-temperature tank 17 needs to participate in heat storage, and the system can operate normally.

[0096] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0097] 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. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A hot water steam generation system, characterized in that, The system includes a steam generating unit, a first compressor unit, and a heat pump unit. The heat pump unit includes a K-class heat pump, where K≥1 and K≥2 are connected in series and / or in parallel. Flash water is input from the steam generating unit to the heat pump unit. The heat pump unit absorbs external heat energy to heat the flash water. After being heated, the flash water returns to the steam generating unit, where steam is generated. The steam is input to the first compressor unit, which compresses the steam and outputs it. The heat pump includes a generator, a condenser, an evaporator, and an absorber. The generator is connected to a high-temperature water supply pipe, and the evaporator is connected to a low-temperature water return pipe. High-temperature water from outside is input into the generator, releases heat, and is then input into the evaporator. After releasing heat again, the water is output from the evaporator to the heat pump. A first circulation pipe connects the steam generating unit to the absorber, a second circulation pipe connects the absorber to the condenser, and a third circulation pipe connects the condenser to the steam generating unit. The flash water is input to the absorber through the first circulation pipe, absorbs heat in the absorber, is input to the condenser through the second circulation pipe, absorbs heat again in the condenser, and returns to the steam generating unit through the third circulation pipe.

2. The hot water steam generation system according to claim 1, characterized in that, The first compressor unit includes a single-stage compressor or a multi-stage compressor, wherein the multi-stage compressors are connected in series or in parallel.

3. A hot water steam generation system, characterized in that, The system includes a steam generating unit, a first compressor unit, and a heat pump unit. The heat pump unit includes a K-class heat pump, where K≥1 and K≥2 are connected in series and / or in parallel. Flash water is input from the steam generating unit to the heat pump unit. The heat pump unit absorbs external heat energy to heat the flash water. After being heated, the flash water returns to the steam generating unit, where steam is generated. The steam is input to the first compressor unit, which compresses the steam and outputs it. The heat pump includes a generator, an evaporator, and an absorber. The generator is connected to a high-temperature water supply pipe, and the evaporator is connected to a low-temperature water return pipe. High-temperature water from outside is input into the generator, releases heat, and is then input into the evaporator. After releasing heat again, the water is output from the evaporator to the heat pump. A first circulation pipe connects the steam generating unit to the absorber, and a third circulation pipe connects the absorber to the steam generating unit. The flash water is input into the absorber through the first circulation pipe, absorbs heat in the absorber, and then returns to the steam generating unit through the third circulation pipe. It also includes a second compressor unit, to which steam generated from the generator is output, and the second compressor unit compresses the steam before outputting it.

4. The hot water steam generation system according to claim 2 or 3, characterized in that, It also includes a heat exchanger, which is connected to the generator via a fourth circulation pipe, to the evaporator via a fifth circulation pipe, to the first circulation pipe via a branch pipe, and to the third circulation pipe via a sixth circulation pipe. The high-temperature water transported from the generator to the evaporator passes through the heat exchanger, and a portion of the flash water is input into the heat exchanger. After being heated in the heat exchanger, it returns to the steam generating unit, where steam is generated.

5. The hot water steam generation system according to claim 2 or 3, characterized in that, The steam generating unit includes a single-stage flash evaporator, which includes a flash water inlet, a flash water outlet, and a steam outlet. The flash water inlet is connected to the heat pump unit through a third circulation pipe, the flash water outlet is connected to the heat pump unit through a first circulation pipe, and the steam outlet is connected to the first compressor unit.

6. The hot water steam generation system according to claim 2 or 3, characterized in that, The steam generating unit includes N-stage flash evaporators, where N≥2, and the N-stage flash evaporators are connected in series. Each flash evaporator includes a flash water inlet, a flash water outlet, and a steam outlet. The flash water inlet of the M-th stage flash evaporator (excluding the first stage flash evaporator) is connected to the flash water outlet of the (M-1)-th stage flash evaporator, where 2≤M≤N. The flash water inlet of the first stage flash evaporator is connected to the heat pump unit through a third circulation pipe, and the flash water outlet of the last stage flash evaporator is connected to the heat pump unit through a first circulation pipe. The steam outlet is connected to the first compressor unit.

7. The hot water steam generation system according to claim 3, characterized in that, The first compressor unit and the second compressor unit include single-stage compressors or multi-stage compressors, and the multi-stage compressors are connected in series or in parallel.

8. The hot water steam generation system according to claim 2 or 3, characterized in that, It also includes a water replenishment pipe, the outlet of which is connected to the first circulation pipe or the third circulation pipe, and the replenishment water is converted into flash evaporation water; It also includes a high-temperature tank, a secondary heat exchanger, and a secondary flash evaporator. The high-temperature tank includes a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet and the first outlet are connected to the secondary heat exchanger, and the second inlet and the second outlet are connected to the secondary flash evaporator. The secondary heat exchanger and the secondary flash evaporator are respectively connected to the first compressor unit.

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