A steam production system

Abstract

The application discloses a steam production system, which solves the problems of great design and construction difficulty and weak adjustment capacity of long-distance steam pipeline. The steam production system comprises a steam generation unit and a compressor unit. The steam generation unit comprises N-stage flash evaporators, and the compressor unit comprises N-stage compressors, wherein N is greater than or equal to 2. The N-stage flash evaporators are connected in series, and flash water passes through the N-stage flash evaporators in sequence. The Mth-stage compressor is connected with the Mth-stage flash evaporator, 1 is less than or equal to M and is less than or equal to N, steam generated by the Mth-stage flash evaporator is input into the Mth-stage compressor, and the Mth-stage compressor outputs the steam after compression. The application uses hot water pipeline network to replace long-distance steam pipeline, reduces the design and construction difficulty, and improves the system stability and production efficiency.

Description

Technical Field

[0001] This application relates to the field of industrial steam supply technology, specifically to a steam production 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 significant 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 produces high-temperature steam, which is then transported to users and subjected to throttling and pressure reduction, resulting in significant irreversible losses. As coal-fired boilers are gradually phased out, it is necessary to find alternative methods to meet the steam demands of industrial users.

[0003] Extracting steam from power plants and then transporting it to industrial users via steam pipelines is a viable alternative to boilers in industrial parks. However, long-distance steam pipelines are complex to design, requiring careful consideration of insulation, pipe diameter selection, and mechanical analysis to ensure safe and stable operation. Furthermore, steam transmission systems have limited regulation capabilities, resulting in significant quality losses during user load fluctuations; the heat pipes consume a large amount of steam during pipeline startup; and under partial load, steam pipelines are prone to condensation and water hammer, among other safety issues. Summary of the Invention

[0004] In order to solve the problems in the prior art, the purpose of this application is to provide a steam production system for producing industrial steam, which can replace long-distance steam pipelines and industrial coal-fired steam boilers.

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

[0006] This application provides a steam production system, including a steam generating unit and a compressor unit. The steam generating unit includes an N-stage flash evaporator, and the compressor unit includes an N-stage compressor, where N ≥ 2. The N-stage flash evaporators are connected in series, and flash water passes through the N-stage flash evaporators sequentially.

[0007] The M-stage compressor is connected to the M-stage flash evaporator, where 1 ≤ M ≤ N. The steam generated by the M-stage flash evaporator is input into the M-stage compressor, which then compresses the steam before outputting it.

[0008] Optionally, the flash evaporator includes a flash water inlet, a flash water outlet, and a steam outlet. 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-1th stage flash evaporator. The flash water inlet of the first stage flash evaporator is connected to the flash water delivery pipeline. The flash water outlet of the last stage flash evaporator is connected to the flash water return pipeline.

[0009] 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.

[0010] Alternatively, the steam inlet of the M-stage compressor is connected to the steam outlet of the M-stage flash evaporator, while 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.

[0011] Optionally, 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-1th stage flash evaporator. The flash water inlet of the first stage flash evaporator is connected to the flash water delivery pipeline. The flash water outlet of the last stage flash evaporator is connected to the flash water return pipeline.

[0012] 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.

[0013] Optionally, it also includes a heat source heating device, a heat source conveying pipeline, and a heat source return pipeline. The heat source heating device includes a high-temperature water outlet and a low-temperature water inlet. The high-temperature water outlet is connected to the heat source conveying pipeline, and the low-temperature water inlet is connected to the heat source return pipeline. The heat source conveying pipeline conveys high-temperature water to the steam generating unit, and the cooled low-temperature water returns to the heat source heating device from the heat source return pipeline.

[0014] Alternatively, it may also include a heat source heating device and a heat source conveying pipeline. The heat source heating device includes a high-temperature water outlet, which is connected to the heat source conveying pipeline. The heat source conveying pipeline conveys high-temperature water to the steam generating unit, and the cooled low-temperature water is discharged to the outside.

[0015] Optionally, it also includes a first circulation pipe and a circulating water heater. The circulating water heater includes a hot water inlet, a hot water outlet, a circulating water inlet, and a circulating water outlet. The hot water inlet is connected to a heat source delivery pipe, and the hot water outlet is connected to a heat source return pipe or discharged externally. The circulating water inlet is connected to the flash water outlet of the steam generating unit through the first circulation pipe, and the circulating water outlet is connected to the flash water inlet of the steam generating unit through the first circulation pipe.

[0016] Optionally, it also includes a water supply pipe and a condensate recovery pipe. The outlet of the water supply pipe and the outlet of the condensate recovery pipe are both connected to the flash water inlet or flash water outlet of the steam generating unit. The water supply and condensate are both converted into flash water in the flash evaporator.

[0017] Optionally, it also includes a preheater, which is equipped with a heat exchanger inside. The heat exchanger is connected to a branch pipe of the heat source delivery pipeline and the water supply pipeline, respectively. The preheater absorbs heat energy in the heat source delivery pipeline and heats the water flowing in the water supply pipeline.

[0018] Alternatively, the heat exchanger is connected to an external heat source pipe and the water supply pipe respectively, and the preheater absorbs the heat energy in the external heat source pipe to heat the water flowing in the water supply pipe.

[0019] Optionally, it also includes a second circulation pipe and a heat pump unit. The heat pump unit includes a K-stage heat pump. When K≥1 and K≥2, the K-stage heat pumps are connected in series and / or in parallel. The heat pump is equipped with an evaporator. The evaporator is connected to the heat source delivery pipe or the hot water outlet of the circulating water heater, as well as the second circulation pipe. The inlet of the second circulation pipe is connected to the circulating water outlet of the last-stage flash evaporator, and the outlet of the second circulation pipe is connected to the circulating water inlet of any stage flash evaporator. The heat pump absorbs the heat energy in the heat source delivery pipe and heats the water flowing in the second circulation pipe.

[0020] Optionally, it also includes a third circulation pipe and a heat pump unit. The heat pump unit includes a K-stage heat pump, where K≥1 and K≥2 are connected in parallel. The heat pump is equipped with an evaporator, which is connected to the heat source delivery pipe or the hot water outlet of the circulating water heater, as well as the third circulation pipe. The third circulation pipe circulates between the M-stage heat pump and the M-stage flash evaporator. The flash evaporator is equipped with a condenser. The third circulation pipe is connected to the evaporator of the M-stage heat pump and the condenser of the M-stage flash evaporator. The heat pump absorbs heat energy from the heat source delivery pipe, heats the refrigerant flowing in the third circulation pipe, and then heats the flash water in the flash evaporator.

[0021] Optionally, the heat pump is an electrically driven heat pump or a thermally driven absorption heat pump.

[0022] Optionally, the heat source heating device is equipped with a seawater desalination device. The fresh water produced by the seawater desalination device is output from the high-temperature water outlet, and the concentrated liquid produced is discharged to the outside.

[0023] Optionally, the steam generating unit is equipped with a heat exchanger, which is connected to the heat source delivery pipeline and the heat source return pipeline. The steam generating unit absorbs the heat energy in the heat source delivery pipeline to heat the flash water in the steam generating unit and produce steam.

[0024] Optionally, it also includes a condensate recovery pipeline, wherein the heat source delivery pipeline and the condensate recovery pipeline are connected together to the flash water inlet of the steam generating unit, and enter the steam generating unit to produce steam, and the heat source return pipeline is connected to the flash water outlet of the steam generating unit.

[0025] Optionally, the compressor is a single-stage compressor or a multi-stage compressor;

[0026] The multi-stage compressor includes H-stage sub-compressors, where H ≥ 2. The H-stage sub-compressors are connected in series, and steam passes through the H-stage sub-compressors sequentially. Each sub-compressor includes a steam outlet and a steam inlet, and a cooling device is installed at the steam outlet.

[0027] Optionally, it also includes a low-temperature tank, a high-temperature tank, an auxiliary heat exchanger, and an auxiliary flash evaporator. The low-temperature tank includes a first inlet and a second inlet and a third inlet. The first inlet and a third inlet are connected to the heat source delivery pipeline, and the second inlet and a third inlet are connected to the heat source return pipeline.

[0028] 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 auxiliary heat exchanger, and the second inlet and the second outlet are connected to the auxiliary flash evaporator. The auxiliary heat exchanger and the auxiliary flash evaporator are respectively connected to the compressor unit.

[0029] As can be seen from the above technical solution, this application provides a steam production system with the following advantages:

[0030] This invention can utilize existing hot water pipe networks for hot water transportation, replacing long-distance steam pipelines. The technology is mature, the transportation safety is high, and it can achieve long-distance heat transportation, significantly reducing the difficulty of design and construction.

[0031] This invention can recover preheated emissions from heavy industrial users, use hot water to transfer heat to industrial users with steam demand, and then extract heat from the hot water to produce steam. The efficiency is significantly higher than that of boilers, while avoiding the combustion of fossil fuels, which can effectively reduce pollution emissions.

[0032] This invention utilizes hot water user terminals to directly generate steam. The equipment can be distributed and the parameters for generating steam can be directly matched with the steam-using equipment, thereby reducing steam transmission losses and throttling losses. Attached Figure Description

[0033] Figure 1This is a schematic diagram of the steam production system of Embodiment 1 of this application;

[0034] Figure 2 This is a schematic diagram of the steam production system of Embodiment 2 of this application;

[0035] Figure 3 This is a schematic diagram of the steam production system of Embodiment 3 of this application;

[0036] Figure 4 These are schematic diagrams of the steam production systems in Embodiments 4, 6, and 7 of this application.

[0037] Figure 5 These are schematic diagrams of the steam production systems in Embodiments 5, 6, and 7 of this application.

[0038] Figure 6 This is a schematic diagram of the steam production system of Embodiment 8 of this application;

[0039] Figure 7 This is a schematic diagram of the steam production system of Embodiment 9 of this application;

[0040] Figure 8 This is a schematic diagram of the steam production system of Embodiment 9 of this application;

[0041] Figure 9 This is a schematic diagram of the steam production system of Embodiment 9 of this application;

[0042] Figure 10 This is a schematic diagram of the steam production system of Embodiment 10 of this application;

[0043] Figure 11 This is a schematic diagram of the steam production system of Embodiment 11 of this application;

[0044] Figure 12 This is a schematic diagram of the steam production system of Embodiment 12 of this application;

[0045] Figure 13 This is a schematic diagram of the steam production system of Embodiment 12 of this application;

[0046] Figure 14 This is a schematic diagram of the steam production system of Embodiment 12 of this application;

[0047] Figure 15 This is a schematic diagram of the steam production system of Embodiment 13 of this application;

[0048] Figure 16 This is a schematic diagram of the steam production system of Embodiment 14 of this application;

[0049] Figure 17This is a schematic diagram of the steam production system of Embodiment 15 of this application.

[0050] 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. Compressor unit; 2-1. First-stage compressor; 2-2. Second-stage compressor; 2-N. Nth-stage compressor; 3. Circulating water heater; 4. Heat source heating device; 5. Preheater; 6. Heat pump unit; 6-1. First-stage heat pump; 6-2. Second-stage heat pump; 6-N. Nth-stage heat pump; 7. Heat source delivery pipeline; 8. Heat source return pipeline; 9. First circulation pipeline; 10. Branch pipeline; 11. Condensate recovery pipeline; 12. Make-up water pipeline; 13. Second circulation pipeline; 14. Third circulation pipeline; 15. Low-temperature tank; 16. High-temperature tank; 17. Auxiliary heater; 18. Auxiliary flash evaporator. Detailed Implementation

[0051] The core idea of ​​this application is:

[0052] Using hot water to transport heat can serve as an alternative to steam. Hot water pipe networks are widely used in centralized heating systems in northern cities, demonstrating mature technology and high transmission safety. Long-distance heat transfer can be achieved through multi-stage pumps. Research has shown that nuclear power plants, thermal power plants, and heavy industrial users all emit significant amounts of waste heat. This waste heat can be recovered, and the hot water can be used to transport heat to industrial users with steam needs. Then, some electricity is consumed to extract heat from the hot water to produce steam. In this process, most of the steam energy comes from the hot water, with only a small portion from electricity, making it significantly more efficient than electric boilers. This process avoids the combustion of fossil fuels, effectively reducing pollution emissions. Furthermore, this process directly produces steam at the hot water user end, allowing for decentralized equipment deployment and direct matching of steam production parameters with the steam-using equipment, thereby reducing steam transmission losses and throttling losses.

[0053] To better understand the purpose, structure, and function of this application, a steam production system and method of this application will be described in further detail below with reference to the accompanying drawings.

[0054] Example 1

[0055] like Figure 1 The above is an embodiment 1 of this application. This embodiment provides a steam production system, including a steam generating unit 1 and a compressor unit 2. The steam generating unit 1 includes an N-stage flash evaporator, and the compressor unit 2 includes an N-stage compressor, where N ≥ 2. The N-stage flash evaporators are connected in series, and the flash water passes through the N-stage flash evaporators in sequence.

[0056] The M-stage compressor is connected to the M-stage flash evaporator, where 1 ≤ M ≤ N. The steam generated by the M-stage flash evaporator is input into the M-stage compressor, which then compresses the steam before outputting it.

[0057] The heat energy required for flash water can come from hot water pipe networks or from waste heat generated by various heavy industrial users. Water from the hot water pipe network can be used directly as flash water, or heat exchange equipment can be used to allow circulating water to absorb heat energy and form flash water.

[0058] from Figure 1 As can be seen from the diagram, steam generating unit 1 includes: first-stage flash evaporator 1-1, second-stage flash evaporator 1-2, ..., Nth-stage flash evaporator 1-N. Compressor unit 2 includes: first-stage compressor 2-1, second-stage compressor 2-2, ..., Nth-stage compressor 2-N.

[0059] 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.

[0060] To facilitate connections between devices, a flash evaporator includes a flash water inlet, a flash water outlet, and a steam outlet. 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-1th stage flash evaporator. The flash water inlet of the first stage flash evaporator is connected to the flash water delivery pipeline. The flash water outlet of the last stage flash evaporator is connected to the flash water return pipeline.

[0061] 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.

[0062] Flash water can produce steam in each stage of the flash evaporator, and then the steam is compressed by a compressor to reach the predetermined temperature and pressure to meet different user needs.

[0063] In this embodiment, the compressor is a single-stage compressor or a multi-stage compressor. Figure 1 The compressor shown is a single-stage compressor.

[0064] The specific structure of the flash evaporator and compressor can be referenced from existing technologies.

[0065] Example 2

[0066] like Figure 2The following is an embodiment of this application. In this embodiment, the steam inlet of the M-th stage compressor is connected to the steam outlet of the M-th stage flash evaporator. At the same time, the steam outlet of the M-th stage compressor (excluding the first stage compressor) is connected to the steam inlet of the (M-1)-th stage compressor. The steam outlet of the first stage compressor is connected to the user's steam pipeline.

[0067] 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.

[0068] 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.

[0069] Example 3

[0070] like Figure 3 The following is an embodiment of this application. 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-1th stage flash evaporator. The flash water inlet of the first stage flash evaporator is connected to the flash water delivery pipeline. The flash water outlet of the last stage flash evaporator is connected to the flash water return pipeline.

[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 4

[0074] like Figure 4 The above is embodiment 4 of this application. In this embodiment, the system further includes a heat source heating device 4, a heat source conveying pipeline 7, and a heat source return pipeline 8. The heat source heating device 4 includes a high-temperature water outlet and a low-temperature water inlet. The high-temperature water outlet is connected to the heat source conveying pipeline 7, and the low-temperature water inlet is connected to the heat source return pipeline 8. The heat source conveying pipeline 7 conveys high-temperature water to the steam generating unit 1, and the cooled low-temperature water returns to the heat source heating device 4 from the heat source return pipeline 8.

[0075] The heat source heating device 4 can be installed in various heavy industrial users to recover the waste heat emitted by heavy industrial users and use hot water to transfer the heat to industrial users with steam demand.

[0076] The heating device 4 can be driven by thermal energy or electrical energy.

[0077] Example 5

[0078] like Figure 5 The figure shown is Embodiment 5 of this application. In this embodiment, the system further includes a heat source heating device 4 and a heat source conveying pipeline 7. The heat source heating device 4 includes a high-temperature water outlet, which is connected to the heat source conveying pipeline 7. The heat source conveying pipeline 7 conveys high-temperature water to the steam generating unit 1, and the cooled low-temperature water is discharged to the outside.

[0079] The water cooled at the end of the process can be supplied to urban water systems, such as reservoirs or freshwater treatment plants.

[0080] To replenish the water in the hot water pipe network, the heat source heating device 4 is equipped with a seawater desalination device. The fresh water produced by the seawater desalination device is output from the high-temperature water outlet, and the concentrated liquid produced is discharged to the outside.

[0081] Example 6

[0082] like Figure 4 , Figure 5 The figure shown is Embodiment 6 of this application. In this embodiment, the system further includes a first circulation pipe 9 and a circulating water heater 3. The circulating water heater 3 includes a hot water inlet, a hot water outlet, a circulating water inlet, and a circulating water outlet. The hot water inlet is connected to the heat source conveying pipe 7, and the hot water outlet is connected to the heat source return pipe 8 or discharged to the outside. The circulating water inlet is connected to the flash water outlet of the steam generating unit 1 through the first circulation pipe 9, and the circulating water outlet is connected to the flash water inlet of the steam generating unit 1 through the first circulation pipe 9.

[0083] like Figure 4 As shown, the hot water outlet is connected to the heat source return pipe 8, and the cooled low-temperature water returns to the heat source heating device 4 from the heat source return pipe 8.

[0084] like Figure 5 As shown, the hot water outlet discharges outwards and can be transported to other devices to continue recovering heat energy, eventually returning to the heat source heating device 4, or ultimately supplied to the city's water system, such as a reservoir or freshwater treatment plant.

[0085] By installing the circulating water heater 3, the mixing of hot water and flash water in the hot water pipe network can be avoided, improving the cleanliness of the flash water and preventing the production steam from being contaminated. At the same time, scale is less likely to form in the steam generation unit 1, reducing the failure rate.

[0086] Example 7

[0087] like Figure 4 , Figure 5The figure shown is Embodiment 7 of this application. In this embodiment, the system also includes a water supply pipe 12 and a condensate recovery pipe 11. The outlet of the water supply pipe 12 and the outlet of the condensate recovery pipe 11 are both connected to the flash water inlet or flash water outlet of the steam generating unit 1. The water supply and condensate are both converted into flash water in the flash evaporator.

[0088] As steam production continues, the flash water in the steam generating unit decreases. Flash water can be replenished to the steam generating unit through the water supply pipe 12 to achieve continuous steam production.

[0089] Condensate recovered from equipment such as compressors and steam transmission pipelines is transported to the steam generation unit through condensate recovery pipeline 11, and flash water can also be added to the steam generation unit.

[0090] Example 8

[0091] like Figure 6 The above is embodiment 8 of this application. In this embodiment, the system also includes a preheater 5. The preheater 5 is equipped with a heat exchanger. The heat exchanger is connected to the branch pipe 10 of the heat source conveying pipe 7 and the water supply pipe 12. The preheater 5 absorbs the heat energy in the heat source conveying pipe 7 and heats the water flowing in the water supply pipe 12.

[0092] Alternatively, the heat exchanger is connected to an external heat source pipe and a water supply pipe 12 respectively. The preheater 5 absorbs the heat energy in the external heat source pipe and heats the water flowing in the water supply pipe 12.

[0093] By setting up preheater 5, the temperature of the makeup water can be increased, preventing low-temperature makeup water from entering the flash evaporator and affecting the production steam.

[0094] Example 9

[0095] like Figure 7 , Figure 8 , Figure 9 The figure shown is Embodiment 9 of this application. In this embodiment, the system further includes a second circulation pipe 13 and a heat pump unit 6. The heat pump unit 6 includes a K-stage heat pump. When K≥1 and K≥2, the K-stage heat pumps are connected in series and / or in parallel. An evaporator is provided inside the heat pump. The evaporator is connected to the hot water outlet of the circulating water heater 3 and the second circulation pipe 13. The inlet of the second circulation pipe 13 is connected to the circulating water outlet of the last stage flash evaporator. The outlet of the second circulation pipe 13 is connected to the circulating water inlet of any stage flash evaporator. The heat pump absorbs the heat energy in the heat source delivery pipe 7 and heats the water flowing in the second circulation pipe 13.

[0096] from Figure 7 , Figure 9 As can be seen from the above, the heat pump unit 6 includes: first-stage heat pump 6-1, second-stage heat pump 6-2, ..., Kth-stage heat pump 6-K.

[0097] like Figure 7 As shown, K-class heat pump series connection refers to the series connection of heat dissipation pipes. For example... Figure 9 As shown, the parallel connection of K-class heat pumps refers to the parallel connection of the heat dissipation pipelines, but the connection between them and the hot water outlet of the circulating water heater 3 is still in series.

[0098] When K-class heat pumps are connected in series, the number of stages of the heat pump is not necessarily the same as the number of stages of the flash evaporator, and there is no fixed correspondence. The number of stages of the heat pump can be less than or greater than the number of stages of the flash evaporator.

[0099] like Figure 8 As shown, the heat pump unit 6 includes only a primary heat pump. The evaporator inside the heat pump is connected to the hot water outlet of the circulating water heater 3 and the second circulation pipe 13. The inlet of the second circulation pipe 13 is connected to the circulating water outlet of the last-stage flash evaporator, and the outlet of the second circulation pipe 13 is connected to the circulating water inlet of the last-stage flash evaporator 1-1. The heat pump absorbs the heat energy in the heat source delivery pipe 7 and heats the water flowing in the second circulation pipe 13.

[0100] The heat pump is either an electrically driven heat pump or a thermally driven absorption heat pump.

[0101] By setting up heat pump unit 6, heat energy from the hot water pipe network can be further absorbed, increasing the temperature of flash water and reducing the temperature of system drainage.

[0102] Example 10

[0103] like Figure 10 The figure shown is Embodiment 10 of this application. In this embodiment, the system further includes a third circulation pipe 14 and a heat pump unit 6. The heat pump unit 6 includes a K-stage heat pump. When K≥1 and K≥2, the K-stage heat pumps are connected in parallel. An evaporator is installed inside the heat pump. The evaporator is connected to the hot water outlet of the circulating water heater 3 and the third circulation pipe 14. The third circulation pipe 14 circulates between the M-stage heat pump and the M-stage flash evaporator. A condenser is installed inside the flash evaporator. The third circulation pipe 14 is connected to the evaporator of the M-stage heat pump and the condenser of the M-stage flash evaporator. The heat pump absorbs the heat energy in the heat source delivery pipe 7, heats the refrigerant flowing in the third circulation pipe 14, and then heats the flash water in the flash evaporator.

[0104] In this embodiment, the N-stage heat pump is connected in parallel, which means that the heat dissipation pipeline is connected in parallel, but it is still connected in series with the hot water outlet of the circulating water heater 3.

[0105] In this embodiment, the number of stages in the heat pump is not necessarily the same as the number of stages in the flash evaporator; the number of stages in the heat pump can be less than or greater than the number of stages in the flash evaporator. For example, heat pump unit 6 includes only one stage of heat pump.

[0106] The heat pump is either an electrically driven heat pump or a thermally driven absorption heat pump.

[0107] The third circulation pipe 14 is also equipped with a compressor, a throttle valve and other devices. The compressor compresses the gaseous refrigerant into a high-temperature, high-pressure liquid refrigerant, which can heat the flash water in the flash evaporator. The throttle valve adjusts the liquid refrigerant into a low-temperature, low-pressure gaseous refrigerant, which can absorb heat from the evaporator.

[0108] Example 11

[0109] like Figure 11 The figure shown is Embodiment 11 of this application. In this embodiment, the system further includes a second circulation pipe 13 and a heat pump unit 6. The heat pump unit 6 includes a K-stage heat pump. When K≥1 and K≥2, the K-stage heat pumps are connected in series. An evaporator is installed inside the heat pump. The evaporator is connected to the high-temperature water outlet and low-temperature water inlet of the heat source heating device 4, as well as the second circulation pipe 13. The inlet of the second circulation pipe 13 is connected to the circulation water outlet of the last stage flash evaporator, and the outlet of the second circulation pipe 13 is connected to the circulation water inlet of any stage flash evaporator. The heat pump absorbs the heat energy in the heat source delivery pipe 7 and heats the water flowing in the second circulation pipe 13.

[0110] from Figure 11 As can be seen from the above, the heat pump unit 6 includes: first-stage heat pump 6-1, second-stage heat pump 6-2, ..., Kth-stage heat pump 6-K.

[0111] like Figure 11 As shown, K-class heat pump series connection refers to the series connection of heat dissipation pipelines.

[0112] When K-class heat pumps are connected in series, the number of stages of the heat pump is not necessarily the same as the number of stages of the flash evaporator, and there is no fixed correspondence. The number of stages of the heat pump can be less than or greater than the number of stages of the flash evaporator.

[0113] The heat pump is either an electrically driven heat pump or a thermally driven absorption heat pump.

[0114] In this embodiment, the system does not have a circulating water heater 3, and the heat pump unit 6 can be directly connected to the heat source delivery pipeline 7.

[0115] In this embodiment, the K-class heat pumps in heat pump unit 6 can also be connected in parallel, as shown in the example below. Figure 9 , Figure 10 The connection structure in the text will not be described in detail here.

[0116] Example 12

[0117] like Figure 12 , Figure 13 , Figure 14The above is an embodiment 12 of this application. In this embodiment, a heat exchanger is provided inside the steam generating unit 1. The heat exchanger is connected to the heat source conveying pipe 7 and the heat source return pipe 8 respectively. The steam generating unit 1 absorbs the heat energy in the heat source conveying pipe 7 and heats the flash water in the steam generating unit 1 to produce steam.

[0118] In this embodiment, the system does not have a circulating water heater 3, and the steam generating unit 1 can be directly connected to the heat source delivery pipeline 7.

[0119] like Figure 13 , Figure 14 As shown, the system can also be equipped with devices such as a preheater 5 and a heat pump unit 6. In the figure, A represents a connection from the same pipeline.

[0120] The connection relationship between the heat pump unit 6 and the steam generating unit 1 can be referred to in Embodiments 9 and 10, and will not be described in detail here.

[0121] Example 13

[0122] like Figure 15 The figure shown is Embodiment 13 of this application. In this embodiment, the system further includes a condensate recovery pipe 11, a heat source conveying pipe 7 and a condensate recovery pipe 11 connected together to the flash water inlet of the steam generating unit 1, which enters the steam generating unit 1 to produce steam, and a heat source return pipe 8 connected to the flash water outlet of the steam generating unit 1.

[0123] In this embodiment, hot water from the heating network is used directly as flash water, which significantly simplifies the system structure.

[0124] Example 14

[0125] like Figure 16 The following is an embodiment 14 of this application. In this embodiment, the compressor is a multi-stage compressor, which includes H-stage sub-compressors, where H ≥ 2. The H-stage sub-compressors are connected in series, and steam passes through the H-stage sub-compressors in sequence. Each sub-compressor includes a steam outlet and a steam inlet, and a cooling device is provided at the steam outlet.

[0126] 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.

[0127] Inside a multi-stage compressor, in order to facilitate the compression of steam, a cooling device can be installed at the steam outlet of the Mth stage sub-compressor (excluding the first stage sub-compressor), for example, by spraying water or blowing air to cool the outlet.

[0128] Example 15

[0129] like Figure 17The figure shown is Embodiment 15 of this application. In this embodiment, the system also includes a low-temperature tank 15, a high-temperature tank 16, an auxiliary heat exchanger 17 and an auxiliary flash evaporator 18. The low-temperature tank 15 includes a first inlet and a second inlet and a second inlet and a third inlet. The first inlet and the third inlet and the fourth inlet and the fifth inlet and the sixth inlet and the seventh inlet and the eighth inlet and the eighth inlet and the ninth ... eighth inlet and the ninth inlet and the eighth inlet and the ninth inlet and the eighth inlet and the eighth inlet and the ninth inlet and the eighth inlet and the eighth inlet and the ninth inlet and the eighth inlet and the eighth in

[0130] The high-temperature tank 16 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 17, and the second inlet and the second outlet are connected to the auxiliary flash evaporator 18. The auxiliary heat exchanger 17 and the auxiliary flash evaporator 18 are respectively connected to the compressor unit 2.

[0131] When the power grid is in a low-demand period, electricity prices are relatively low, and the system can increase steam production, which is then stored as heat energy in the high-temperature tank 16 via the auxiliary heat exchanger 17. At this time, hot water transported from the heat source heating device 4 and hot water stored in the low-temperature tank 15 are simultaneously supplied to the system.

[0132] When the power grid is in peak electricity demand and electricity prices are relatively high, the system can reduce steam production. The high-temperature tank 16 outputs hot steam through the auxiliary flash evaporator 18. The hot steam is then input into the compressor unit 2 for compression, and output to users after reaching the required pressure, thereby reducing steam production costs. At this time, the long-distance hot water transported from the heat source heating device 4 can be transported to the low-temperature tank 15 for storage.

[0133] When the power grid is in normal operation, neither the cryogenic tank 15 nor the high-temperature tank 16 needs to participate in heat storage, and the system can operate normally.

[0134] 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.

[0135] 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.

[0136] 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 steam production system, characterized in that, It includes a steam generating unit and a compressor unit. The steam generating unit includes an N-stage flash evaporator, and the compressor unit includes an N-stage compressor, where N ≥ 2. The N-stage flash evaporators are connected in series, and the flash water passes through the N-stage flash evaporators sequentially. The M-stage compressor is connected to the M-stage flash evaporator, 1≤M≤N. The steam generated by the M-stage flash evaporator is input into the M-stage compressor, and the M-stage compressor compresses the steam and outputs it. 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-1th stage flash evaporator. The flash water inlet of the first stage flash evaporator is connected to the flash water delivery pipeline. The flash water outlet of the last stage flash evaporator is connected to the flash water return pipeline. 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.

2. The steam production system according to claim 1, characterized in that, It also includes a heat source heating device, a heat source conveying pipeline, and a heat source return pipeline. The heat source heating device includes a high-temperature water outlet and a low-temperature water inlet. The high-temperature water outlet is connected to the heat source conveying pipeline, and the low-temperature water inlet is connected to the heat source return pipeline. The heat source conveying pipeline conveys high-temperature water to the steam generating unit, and the cooled low-temperature water returns to the heat source heating device from the heat source return pipeline. Alternatively, it may also include a heat source heating device and a heat source conveying pipeline. The heat source heating device includes a high-temperature water outlet, which is connected to the heat source conveying pipeline. The heat source conveying pipeline conveys high-temperature water to the steam generating unit, and the cooled low-temperature water is discharged to the outside.

3. The steam production system according to claim 2, characterized in that, It also includes a first circulation pipe and a circulating water heater. The circulating water heater includes a hot water inlet, a hot water outlet, a circulating water inlet, and a circulating water outlet. The hot water inlet is connected to a heat source delivery pipe, and the hot water outlet is connected to a heat source return pipe or discharged externally. The circulating water inlet is connected to the flash water outlet of the steam generating unit through the first circulation pipe, and the circulating water outlet is connected to the flash water inlet of the steam generating unit through the first circulation pipe.

4. The steam production system according to claim 2, characterized in that, It also includes a water supply pipe and a condensate recovery pipe. The outlet of the water supply pipe and the outlet of the condensate recovery pipe are both connected to the flash water inlet or flash water outlet of the steam generating unit. The water supply and condensate are both converted into flash water in the flash evaporator.

5. The steam production system according to claim 4, characterized in that, It also includes a preheater, which has a heat exchanger inside. The heat exchanger is connected to a branch pipe of the heat source delivery pipeline and the water supply pipeline. The preheater absorbs heat energy in the heat source delivery pipeline and heats the water flowing in the water supply pipeline. Alternatively, the heat exchanger is connected to an external heat source pipe and the water supply pipe respectively, and the preheater absorbs the heat energy in the external heat source pipe to heat the water flowing in the water supply pipe.

6. The steam production system according to claim 3, characterized in that, It also includes a second circulation pipe and a heat pump unit. The heat pump unit includes a K-stage heat pump. When K≥1 and K≥2, the K-stage heat pumps are connected in series and / or in parallel. The heat pump is equipped with an evaporator. The evaporator is connected to the heat source delivery pipe or the hot water outlet of the circulating water heater, as well as the second circulation pipe. The inlet of the second circulation pipe is connected to the circulating water outlet of the last-stage flash evaporator, and the outlet of the second circulation pipe is connected to the circulating water inlet of any stage flash evaporator. The heat pump absorbs the heat energy in the heat source delivery pipe and heats the water flowing in the second circulation pipe.

7. The steam production system according to claim 3, characterized in that, It also includes a third circulation pipe and a heat pump unit. The heat pump unit includes a K-level heat pump. When K≥1 and K≥2, the K-level heat pumps are connected in parallel. The heat pump is equipped with an evaporator. The evaporator is connected to the heat source delivery pipe or the hot water outlet of the circulating water heater, as well as the third circulation pipe. The third circulation pipe circulates between the M-level heat pump and the M-level flash evaporator. The flash evaporator is equipped with a condenser. The third circulation pipe is connected to the evaporator of the M-level heat pump and the condenser of the M-level flash evaporator. The heat pump absorbs the heat energy in the heat source delivery pipe, heats the refrigerant flowing in the third circulation pipe, and then heats the flash water in the flash evaporator.

8. The steam production system according to claim 6 or 7, characterized in that, The heat pump is an electrically driven heat pump or a thermally driven absorption heat pump.

9. The steam production system according to claim 2, characterized in that, The heat source heating device is equipped with a seawater desalination device. The fresh water produced by the seawater desalination device is output from the high-temperature water outlet, and the concentrated liquid produced is discharged to the outside.

10. The steam production system according to claim 2, characterized in that, The steam generating unit is equipped with a heat exchanger, which is connected to the heat source delivery pipeline and the heat source return pipeline. The steam generating unit absorbs the heat energy in the heat source delivery pipeline to heat the flash water in the steam generating unit and produce steam.

11. The steam production system according to claim 2, characterized in that, It also includes a condensate recovery pipeline, wherein the heat source delivery pipeline and the condensate recovery pipeline are connected together to the flash water inlet of the steam generating unit, and enter the steam generating unit to produce steam, and the heat source return pipeline is connected to the flash water outlet of the steam generating unit.

12. The steam production system according to claim 1, characterized in that, The compressor is a single-stage compressor or a multi-stage compressor; The multi-stage compressor includes H-stage sub-compressors, where H ≥ 2. The H-stage sub-compressors are connected in series, and steam passes through the H-stage sub-compressors sequentially. Each sub-compressor includes a steam outlet and a steam inlet, and a cooling device is installed at the steam outlet.

13. The steam production system according to claim 2, characterized in that, It also includes a low-temperature tank, a high-temperature tank, an auxiliary heat exchanger, and an auxiliary flash evaporator. The low-temperature tank includes a first inlet and a second inlet and a third inlet. The first inlet and a third inlet are connected to the heat source delivery pipeline, and the second inlet and a third inlet are connected to the heat source return pipeline. 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 auxiliary heat exchanger, and the second inlet and the second outlet are connected to the auxiliary flash evaporator. The auxiliary heat exchanger and the auxiliary flash evaporator are respectively connected to the compressor unit.

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