Steam production system and control method thereof

Abstract

The invention provides a steam production system and a control method thereof. The system comprises a flash evaporation compression unit, a high-temperature heat storage tank and a second flash evaporation unit. A water inlet and a water outlet of the flash evaporation compression unit are connected with a heat source water supply pipeline and a heat source water return pipeline correspondingly, and the flash evaporation compression unit comprises a first flash evaporation unit, a first compressor unit and a first heat exchange unit. A water inlet and a water outlet of the first flash evaporation unit are respectively connected with a water inlet and a water outlet of the flash evaporation compression unit, and a steam outlet of the first flash evaporation unit is connected with a steam inlet of the first compressor unit; a steam outlet of the first compressor unit is connected with a first connector of the first heat exchange unit. And a second interface of the first heat exchange unit is connected with a water outlet of the first flash evaporation unit. And a first interface and a second interface of the high-temperature heat storage tank are respectively connected with a third interface and a fourth interface of the first heat exchange unit in the flash evaporation compression unit. And a water inlet and a water outlet of the second flash evaporation unit are respectively connected with a third interface and a fourth interface of the high-temperature heat storage tank.

Description

Technical Field

[0001] The present application relates to the field of industrial heat technology, and in particular to a steam production system and a control method thereof. Background Art

[0002] Industrial heat mainly includes heating, distillation, drying, sterilization and other processes, accounting for more than 60% of the energy consumption structure of most industrial industries. At present, industrial heat mainly comes from decentralized coal-fired / gas-fired boilers and centralized steam transportation of cogeneration. Among them, decentralized boiler heating generally adopts the mode of high-pressure production and terminal throttling, which seriously wastes high-quality energy. As for centralized steam transportation of cogeneration, because thermal power plants are often far away from heat users, during long-distance transportation, due to pipeline heat dissipation and resistance along the way, the temperature, pressure and other parameters of steam will change greatly, which limits the development and application of long-distance steam transportation systems. Therefore, water vapor conversion technology that supplies high-quality steam by recycling low-temperature waste heat in the factory or by long-distance heating of hot water and reusing flash evaporation or flash evaporation after compression at the user has also been proposed. Although the problems of grade mismatch and transportation difficulties have been solved, the technology has not been applied and promoted in the field of industrial heating due to high power consumption and high cost.

[0003] In recent years, the installed capacity of renewable energy has gradually increased. The intermittent, volatile and random characteristics of renewable energy generation will lead to the redundancy of wind power and photovoltaic power, resulting in serious "wind abandonment" and "light abandonment" phenomena, which will also have a great impact on the regulation of the power grid system. Therefore, it is very important to improve the utilization efficiency of heat source water, increase the amount of steam preparation, absorb electricity during low electricity price periods, and reduce electricity consumption during high electricity price periods. Summary of the invention

[0004] The purpose of the present application is to provide a steam production system and a control method thereof, which can improve the economy of the steam production system and enhance the regulation capability of peak shaving and valley filling.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] Technical solution 1: A steam production system, comprising:

[0007] A flash compression unit, having a water inlet and a water outlet, wherein the water inlet and the water outlet of the flash compression unit are respectively used to be connected to a heat source water supply pipeline and a heat source return water pipeline, and the flash compression unit comprises a first flash unit, a first compressor unit and a first heat exchange unit, wherein the water inlet and the water outlet of the first flash unit are respectively connected to the water inlet and the water outlet of the flash compression unit, and the steam outlet of the first flash unit is connected to the steam inlet of the first compressor unit; the steam outlet of the first compressor unit is used to supply steam to a user and is connected to a first interface of the first heat exchange unit; the second interface of the first heat exchange unit is connected to the water outlet of the first flash unit;

[0008] A high-temperature heat storage tank, wherein the first interface and the second interface of the high-temperature heat storage tank are respectively connected to the third interface and the fourth interface of the first heat exchange unit in the flash compression unit;

[0009] A second flash unit, wherein the water inlet and the water outlet of the second flash unit are respectively connected to the third interface and the fourth interface of the high-temperature heat storage tank, and the steam outlet of the second flash unit is used to supply steam to a user.

[0010] Technical Solution 2: The steam production system as described in Technical Solution 1 further includes a low-temperature heat storage tank, and the flash compression unit is used to connect to the heat source water supply pipeline and the heat source water return pipeline through the low-temperature heat storage tank, wherein:

[0011] The first interface and the second interface of the low-temperature heat storage tank are respectively used to connect to the heat source water supply pipeline and the heat source return pipeline, and the third interface and the fourth interface of the low-temperature heat storage tank are respectively connected to the water inlet and the water outlet of the flash compression unit.

[0012] Technical Solution 3: In the steam production system as described in Technical Solution 2, the first interface and the third interface of the low-temperature heat storage tank are connected through a first bypass pipeline, and the second interface and the fourth interface of the low-temperature heat storage tank are connected through a second bypass pipeline.

[0013] Technical Solution 4: The steam production system according to Technical Solution 2 further comprises a second compressor unit, wherein the second flash unit supplies steam to a user through the second compressor unit.

[0014] The steam outlet of the second flash unit is connected to the steam inlet of the second compressor unit, and the steam outlet of the second compressor unit is used to supply steam to a user.

[0015] Technical Solution 5: In the steam production system as described in Technical Solution 2, the second flash unit is used to supply steam to a user through the first compressor unit, wherein the steam outlet of the second flash unit is connected to the steam inlet of the first compressor unit.

[0016] Technical Solution 6: In the steam production system as described in any one of Technical Solutions 1 to 5, the flash compression unit further includes a second heat exchange unit, wherein:

[0017] The first interface and the second interface of the second heat exchange unit are respectively connected to the water inlet and the water outlet of the flash compression unit, and the third interface and the fourth interface of the second heat exchange unit are respectively connected to the water inlet and the water outlet of the first flash unit.

[0018] Technical Solution 7: In the steam production system as described in any one of Technical Solutions 1 to 5, the flash compression unit further includes a heat pump unit, wherein:

[0019] The first interface and the second interface of the heat pump unit are respectively connected to the water inlet and the water outlet of the flash compression unit, and the third interface and the fourth interface of the heat pump unit are respectively connected to the water inlet and the water outlet of the first flash unit.

[0020] Technical Solution 8: The steam production system as described in any one of Technical Solutions 1 to 5, wherein the first flash unit comprises a plurality of first flash evaporators, and the plurality of first flash evaporators are sequentially connected in series, wherein the water inlet of the first-stage first flash evaporator and the water outlet of the last-stage first flash evaporator serve as the water inlet and water outlet of the first flash unit respectively, and the water outlets and water inlets of two adjacent first flash evaporators are connected;

[0021] The first compressor unit includes a plurality of first compressors, which are connected in series in sequence, wherein the steam outlet of each first flash evaporator is respectively connected to the steam inlet of the corresponding first compressor, and the steam outlet and steam inlet of two adjacent first compressors are connected.

[0022] Technical Solution 9: The steam production system according to any one of Technical Solutions 1 to 5, wherein the first compressor unit comprises a plurality of first compressors, the plurality of first compressors are connected in series in sequence, and the steam outlets and steam inlets of two adjacent first compressors are connected;

[0023] The first heat exchange unit includes multiple stages of first heat exchangers, which are connected in series in sequence, wherein the third interface of the first stage of the first heat exchanger and the fourth interface of the last stage of the first heat exchanger are respectively connected to the first interface and the second interface of the high-temperature heat storage tank, the first interface and the second interface of each stage of the first heat exchanger are respectively connected to the steam outlet and the steam inlet of the corresponding first stage of the first compressor, and the fourth interface and the third interface of the first heat exchangers of two adjacent stages are connected.

[0024] Technical Solution 10: In the steam production system as described in any one of Technical Solutions 2 to 5, a first valve is provided in at least one connecting pipeline between the third interface of the low-temperature heat storage tank and the water inlet of the flash compression unit and between the fourth interface of the low-temperature heat storage tank and the water outlet of the flash compression unit;

[0025] A second valve is provided in at least one connecting pipeline between the first interface of the high-temperature heat storage tank and the third interface of the first heat exchange unit and between the second interface of the high-temperature heat storage tank and the fourth interface of the first heat exchange unit;

[0026] A third valve is provided in at least one connecting pipeline between the steam outlet of the first compressor unit and the first interface of the first heat exchange unit and between the second interface of the first heat exchange unit and the water outlet of the first flash unit;

[0027] A fourth valve is provided in at least one connecting pipeline between the third interface of the high-temperature heat storage tank and the water inlet of the second flash unit and between the fourth interface of the high-temperature heat storage tank and the water outlet of the second flash unit.

[0028] Technical Solution 11: The steam production system as described in Technical Solution 10, wherein the steam production system has at least one operating mode among a first operating mode, a second operating mode and a third operating mode, wherein:

[0029] In the first operation mode, the first valve and the second valve are closed, the fourth valve is opened, the flash compression unit stops running, the second flash unit is running, and the low-temperature heat storage tank and the high-temperature heat storage tank are disconnected from the flash compression unit;

[0030] In the second operation mode, the first valve, the second valve and the third valve are all opened, the fourth valve is closed, the flash compression unit operates normally, the second flash unit does not operate, wherein the low-temperature heat storage tank releases heat, and the high-temperature heat storage tank stores heat;

[0031] In the third operating mode, the first valve is opened, the second valve, the third valve and the fourth valve are all closed, the flash compression unit partially operates, the first heat exchange unit and the second flash unit do not operate, wherein the low-temperature heat storage tank does not release heat, and the high-temperature heat storage tank does not store heat.

[0032] Technical Solution 12: For the steam production system as described in Technical Solution 11, during the peak electricity price period, the steam production system is in the first operating mode; during the valley electricity price period, the steam production system is in the second operating mode; during the flat electricity price period, the steam production system is in the third operating mode.

[0033] Technical Solution 13: In the steam production system as described in Technical Solution 2, 4 or 4, the first interface and the third interface of the high-temperature heat storage tank are merged into one interface, and the second interface and the fourth interface of the high-temperature heat storage tank are merged into another interface; the first interface and the third interface of the low-temperature heat storage tank are merged into one interface, and the second interface and the fourth interface of the low-temperature heat storage tank are merged into another interface.

[0034] Technical Solution 14: A control method for a steam production system, the steam production system comprising a flash compression unit, a high-temperature heat storage tank and a second flash unit, the flash compression unit comprising a first heat exchange unit, the control method comprising:

[0035] During the peak electricity price period, the steam production system is controlled to be in a first operation mode, wherein, in the first operation mode, the flash compression unit is controlled to stop operating, the high-temperature heat storage tank is disconnected from the flash compression unit, and the high-temperature water stored in the high-temperature heat storage tank is flashed into steam by the second flash unit to supply users;

[0036] During the valley electricity price period, the steam production system is controlled to be in the second operation mode, wherein in the second operation mode, the flash compression unit is controlled to operate normally, a part of the steam after flash compression of hot water by the flash compression unit is directly supplied to the user, and the other part of the steam is converted into hot water by the first heat exchange unit in the flash compression unit and then stored in the high-temperature heat storage tank.

[0037] Technical Solution 15: According to the control method of Technical Solution 14, the steam production system further includes a second compressor unit, wherein the control method further includes:

[0038] The steam flashed by the second flash unit is further compressed by the second compressor unit and then supplied to users.

[0039] Technical Solution 16: The control method according to Technical Solution 14 or 15, further comprising:

[0040] During the flat electricity price period, the steam production system is controlled to be in a third operation mode, wherein in the third operation mode, the flash compression unit is controlled to partially operate, the flash compression unit is disconnected from the high-temperature heat storage tank, the first heat exchange unit and the second flash unit are not operated, hot water is directly supplied to users through steam flash-compressed by the flash compression unit, and the high-temperature heat storage tank does not store heat.

[0041] Technical Solution 17: According to the control method of Technical Solution 16, the steam production system further includes a low-temperature heat storage tank, and the control method further includes:

[0042] In the first operation mode, the low-temperature heat storage tank is disconnected from the flash compression unit, and the low-temperature heat storage tank is controlled to be connected only to the heat source water supply pipeline and the heat source water return pipeline, wherein the hot water in the heat source water supply pipeline is supplemented into the low-temperature heat storage tank, replaces the original low-temperature water in the low-temperature heat storage tank, and then enters the heat source water return pipeline;

[0043] In the second operation mode, the hot water in the heat source water supply pipeline and the hot water in the low-temperature heat storage tank enter the flash compression unit together, wherein the low-temperature heat storage tank releases heat;

[0044] In the third operation mode, only the hot water in the heat source water supply pipeline enters the flash compression unit, wherein the low-temperature heat storage tank does not release heat.

[0045] The steam production system and control method thereof provided by one or more technical solutions of the present application adopt a steam production method that consumes excess renewable energy electricity and transmits water to produce steam, thereby overcoming the problem of poor economic efficiency of traditional steam production methods.

[0046] The steam production system and control method thereof provided by one or more technical solutions of the present application utilize a high-temperature heat storage tank, a low-temperature heat storage tank, and a flash compression unit to transfer electricity from periods of low electricity prices to periods of high electricity prices, thereby facilitating the absorption of renewable energy and the regulation of the power grid.

[0047] The steam production system and control method provided by one or more technical solutions of the present application improve the economy of the steam production system by adjusting the operation strategies in different time periods, changing the equipment operation mode in different electricity price periods, using more electricity in low electricity price periods, and reducing electricity in high electricity price periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic structural diagram of the steam production system of the first embodiment of the present application.

[0049] Figure 2 This is a schematic structural diagram of a steam production system according to a second embodiment of the present application.

[0050] Figure 3 This is a schematic structural diagram of a steam production system according to the third embodiment of the present application.

[0051] Figure 4 This is a schematic structural diagram of a steam production system according to a fourth embodiment of the present application.

[0052] Figure 5 This is a schematic structural diagram of a steam production system according to the fifth embodiment of the present application.

[0053] Figure 6This is a schematic structural diagram of a steam production system according to the sixth embodiment of the present application.

[0054] Figure 7 This is a schematic structural diagram of a steam production system according to the seventh embodiment of the present application.

[0055] Figure 8 This is a schematic structural diagram of a steam production system according to the eighth embodiment of the present application.

[0056] Fig. 9 This is a schematic structural diagram of a steam production system according to the ninth embodiment of the present application.

[0057] Fig.10 This is a schematic diagram of the state of the steam production system of the present application in the first operating mode.

[0058] Fig.11 This is a schematic diagram of the state of the steam production system of the present application in the second operating mode.

[0059] Fig.12 This is a schematic diagram of the status of the steam production system of the present application in the third operating mode. DETAILED DESCRIPTION

[0060] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0061] This application proposes a steam production system and a control method thereof, which optimizes the system process of using hot water to produce industrial steam, and proposes corresponding operation modes in different power consumption periods. The hot water transmission technology is mature and reliable, and the water transmission and steam production technology is environmentally friendly and has significantly improved thermal efficiency. In addition, while retaining the advantages of water transmission and steam production, this application reduces the heating cost of the system, improves the absorption capacity of renewable energy, and reduces the "wind and solar abandonment" phenomenon caused by the volatility and intermittent characteristics of renewable energy, thereby broadening the application prospects of water transmission and steam production technology.

[0062] The steam production system and control method thereof of various embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0063] First embodiment

[0064] Figure 1 The structural schematic diagram of the steam production system of the first embodiment of the present application is disclosed. Figure 1As shown, the steam production system includes a low-temperature heat storage tank 1, a flash compression unit 2, a high-temperature heat storage tank 3, a second flash unit 4 and a second compressor unit 5.

[0065] The flash compression unit 2 may include a first flash unit 21, a first compressor unit 22 and a first heat exchange unit 23. The first heat exchange unit 23 may be, for example, a plate heat exchanger having a first interface 231, a second interface 232, a third interface 233 and a fourth interface 234. The flash compression unit 2 has a water inlet 201 and a water outlet 202. The water inlet and the water outlet of the first flash unit 21 are respectively connected to the water inlet 201 and the water outlet 202 of the flash compression unit 2, and the steam outlet of the first flash unit 21 is connected to the steam inlet of the first compressor unit 22. The steam outlet of the first compressor unit 22 is connected to the first interface 231 of the first heat exchange unit 23, and the steam outlet of the first compressor unit 22 is used to be connected to the steam delivery pipeline 73, and the prepared steam can be supplied to industrial users through the steam delivery pipeline 73. The second interface 232 of the first heat exchange unit 23 is connected to the water outlet of the first flash unit 21.

[0066] The flash compression unit 2 is used to connect to the heat source water supply pipeline 71 and the heat source return water pipeline 72 through the low-temperature heat storage tank 1. The low-temperature heat storage tank 1 has a first interface 11, a second interface 12, a third interface 13 and a fourth interface 14. Among them, the first interface 11 and the second interface 12 of the low-temperature heat storage tank 1 are respectively used to connect to the heat source water supply pipeline 71 and the heat source return water pipeline 72, and the third interface 13 and the fourth interface 14 of the low-temperature heat storage tank 1 are respectively connected to the water inlet 201 and the water outlet 202 of the flash compression unit 2.

[0067] The high temperature heat storage tank 3 has a first interface 31, a second interface 32, a third interface 33 and a fourth interface 34. The first interface 31 and the second interface 32 of the high temperature heat storage tank 3 are connected to the third interface 233 and the fourth interface 234 of the first heat exchange unit 23 in the flash compression unit 2 respectively.

[0068] The water inlet and the water outlet of the second flash unit 4 are respectively connected to the third interface 33 and the fourth interface 34 of the high-temperature heat storage tank 3. The second flash unit 4 can supply steam to the user after being compressed by the second compressor unit 5. The steam outlet of the second flash unit 4 is connected to the steam inlet of the second compressor unit 5, and the steam outlet of the second compressor unit 5 is used to be connected to the steam delivery pipeline 73, and the steam is supplied to the user through the steam delivery pipeline 73.

[0069] Second embodiment

[0070] Figure 2 The structural schematic diagram of the steam production system of the second embodiment of the present application is disclosed. Figure 2 As shown, Figure 2 The steam production system shown is similar to Figure 1 The steam generation system shown differs in that Figure 2 In the steam production system shown, the flash compression unit 2 may further include a second heat exchange unit 24 .

[0071] The second heat exchange unit 24 has a first interface 241, a second interface 242, a third interface 243 and a fourth interface 244. The first interface 241 and the second interface 242 of the second heat exchange unit 24 are respectively connected to the water inlet 201 and the water outlet 202 of the flash compression unit 2, and the third interface 243 and the fourth interface 244 of the second heat exchange unit 24 are respectively connected to the water inlet and the water outlet of the first flash unit 21.

[0072] Third embodiment

[0073] Figure 3 The structural schematic diagram of the steam production system of the third embodiment of the present application is disclosed. Figure 3 As shown, Figure 3 The steam production system shown is similar to Figure 2 The steam generation system shown differs in that Figure 3 In the steam production system shown, the flash compression unit 2 has multi-stage flash and multi-stage compression.

[0074] Specifically, the first flash unit 21 includes a plurality of first flash evaporators 210, which are connected in series in sequence, and the flashed water passes through the plurality of first flash evaporators 210 in sequence. The water inlet of the first-stage first flash evaporator 210 and the water outlet of the last-stage first flash evaporator 210 serve as the water inlet and water outlet of the first flash unit 21, respectively, and the water outlets and water inlets of two adjacent first flash evaporators 210 are connected.

[0075] The first compressor unit 22 includes a plurality of first compressors 220, which are connected in series in sequence, and the steam outlets and steam inlets of two adjacent first compressors 220 are connected. The steam outlet of each first flash evaporator 210 is connected to the steam inlet of the corresponding first compressor 220.

[0076] Optionally, the multi-stage first compressor 220 can be designed with an inter-stage water spraying link to connect the water outlet of each stage of the first flash evaporator 210 with the steam outlet of the corresponding first compressor 220, so that the flash return water of the first flash evaporator 210 can be used to reduce the superheat of the outlet of the first compressor 220, thereby preventing problems such as carbonization of the lubricating oil of the first compressor 220 and reduction of material stress.

[0077] Fourth embodiment

[0078] Figure 4The structural schematic diagram of the steam production system of the fourth embodiment of the present application is disclosed. Figure 4 As shown, Figure 4 The steam production system shown is similar to Figure 2 The steam generation system shown differs in that Figure 4 In the steam production system shown, the flash compression unit 2 has multi-stage compression and multi-stage heat exchange.

[0079] Specifically, the first compressor unit 22 includes a plurality of first compressors 220, which are connected in series in sequence, and the steam outlets and steam inlets of two adjacent first compressors 220 are connected.

[0080] The first heat exchange unit 23 includes a multi-stage first heat exchanger 230, which is connected in series in sequence, wherein the third interface of the first-stage first heat exchanger 230 and the fourth interface of the last-stage first heat exchanger 230 are respectively connected to the first interface 31 and the second interface 32 of the high-temperature heat storage tank 3, the first interface and the second interface of each stage of the first heat exchanger 230 are respectively connected to the steam outlet and the steam inlet of the corresponding first-stage first compressor 220, and the fourth interface and the third interface of the two adjacent stages of the first heat exchanger 230 are connected.

[0081] In some embodiments, the second flash unit 4 of the present application may have multiple stages of flash evaporation and the second compressor unit 5 may have multiple stages of compression.

[0082] Specifically, the second flash unit 4 includes a plurality of second flash evaporators 40, which are sequentially connected in series, and the flashed water sequentially passes through the plurality of second flash evaporators 40. The water inlet of the first second flash evaporator 40 and the water outlet of the last second flash evaporator 40 serve as the water inlet and water outlet of the second flash unit 4, respectively, and the water outlets and water inlets of two adjacent second flash evaporators 40 are connected.

[0083] The second compressor unit 5 includes a plurality of second compressors 50, which are connected in series in sequence, and the steam outlets and steam inlets of two adjacent second compressors 50 are connected. The steam outlet of each second flash evaporator 40 is connected to the steam inlet of the corresponding second compressor 50.

[0084] Optionally, the multi-stage second compressor 50 can be designed with an inter-stage water spraying link to connect the water outlet of each stage of the second flash evaporator 40 with the steam outlet of the corresponding first stage of the second compressor 50, so that the flash return water of the second flash evaporator 40 can be used to reduce the superheat of the outlet of the second compressor 50, thereby preventing problems such as carbonization of the lubricating oil of the second compressor 50 and reduction of material stress.

[0085] Fifth embodiment

[0086] When the temperature of the high-temperature heat storage tank 3 is high, the second compressor unit 5 may be eliminated. Figure 5 The structural schematic diagram of the steam production system of the fifth embodiment of the present application is disclosed. Figure 5 As shown, Figure 5 The steam production system shown is Figure 2 The main difference between the steam production system shown is that Figure 5 The steam production system shown does not have the second compressor unit 5, and the steam outlet of the second flash unit 4 can be used to be directly connected to the steam delivery pipeline 73, and the required steam is directly prepared through the second flash unit 4, and the steam is supplied to the user through the steam delivery pipeline 73. It can be understood that the situation shown in the fifth embodiment can also be applied to other embodiments of the present application.

[0087] Sixth embodiment

[0088] Figure 6 A structural schematic diagram of a steam production system according to a sixth embodiment of the present application is disclosed. Figure 6 The steam production system shown is similar to Figure 2 The steam generation system shown differs in that Figure 6 In the steam production system shown, the second compressor unit 5 can be shared with the first compressor unit 22, so that the second compressor unit 5 can be eliminated. The steam outlet of the second flash unit 4 is connected to the steam inlet of the first compressor unit 22. The second flash unit 4 can supply steam to users through the first compressor unit 22.

[0089] Seventh embodiment

[0090] Figure 7 The structural schematic diagram of the steam production system of the seventh embodiment of the present application is disclosed. Figure 7 As shown, Figure 7 The steam production system shown is similar to Figure 1 The steam generation system shown differs in that Figure 7 In the steam production system shown, the flash compression unit 2 may further include a heat pump unit 25 .

[0091] The heat pump unit 25 can be, for example, an electric compression heat pump, or a heat pump driven by any other energy source such as steam, hot water, gas, etc. The heat pump unit 25 has a first interface 251, a second interface 252, a third interface 253, and a fourth interface 254. The first interface 251 and the second interface 252 of the heat pump unit 25 are respectively connected to the water inlet 201 and the water outlet 202 of the flash compression unit 2, and the third interface 253 and the fourth interface 254 of the heat pump unit 25 are respectively connected to the water inlet and the water outlet of the first flash unit 21.

[0092] Eighth embodiment

[0093] Figure 8 The structural schematic diagram of the steam production system of the eighth embodiment of the present application is disclosed. Figure 8 As shown, Figure 8 The steam production system shown is similar to Figure 2 The steam generation system shown differs in that Figure 8 In the steam production system shown in the figure, a first valve 81 is provided in at least one connecting pipeline between the third interface 13 of the low-temperature heat storage tank 1 and the water inlet 201 of the flash compression unit 2 and between the fourth interface 14 of the low-temperature heat storage tank 1 and the water outlet 202 of the flash compression unit 2; a second valve 82 is provided in at least one connecting pipeline between the first interface 31 of the high-temperature heat storage tank 3 and the third interface 233 of the first heat exchange unit 23 and between the second interface 32 of the high-temperature heat storage tank 3 and the fourth interface 234 of the first heat exchange unit 23; a third valve 83 is provided in at least one connecting pipeline between the steam outlet of the first compressor unit 22 and the first interface 231 of the first heat exchange unit 23 and between the second interface 232 of the first heat exchange unit 23 and the water outlet of the first flash unit 21; a fourth valve 84 is provided in at least one connecting pipeline between the third interface 33 of the high-temperature heat storage tank 3 and the water inlet of the second flash unit 4 and between the fourth interface 34 of the high-temperature heat storage tank 3 and the water outlet of the second flash unit 4 (as shown in FIG. 1 ). Fig.10 shown).

[0094] Of course, it can be understood that the setting form, setting number and setting position of the valves in the steam production system of the present application are not limited to those shown in the drawings of the present application. The steam production system of the present application can also set valves in other connecting pipelines. As long as all valves added play a shut-off role in the system, they will be covered within the protection scope of the present application.

[0095] Ninth embodiment

[0096] Fig. 9 The structural schematic diagram of the steam production system of the ninth embodiment of the present application is disclosed. Fig. 9 As shown, Fig. 9 The steam production system shown is similar to Figure 8 The steam generation system shown differs in that Fig. 9 In the steam production system shown, the first interface 11 and the third interface 13 of the low-temperature heat storage tank 1 are connected through a first bypass pipeline, and the second interface 12 and the fourth interface 14 of the low-temperature heat storage tank 1 are connected through a second bypass pipeline.

[0097] In the above embodiments, the steam production system of the present application may also not be provided with a low-temperature heat storage tank 1 to balance the heat input from the heat source. When more heat is needed, more heat is taken from the heat source, and no heat is taken during the period when heat is not needed. When the low-temperature heat storage tank 1 is eliminated, the water inlet 201 and the water outlet 202 of the flash compression unit 2 can be used to connect to the heat source water supply pipeline 71 and the heat source return water pipeline 72, respectively.

[0098] In the above embodiment, the low-temperature heat storage tank 1 in the steam production system of the present application can modify the four interfaces into two interfaces, that is, the first interface 11 and the third interface 13 of the low-temperature heat storage tank 1 can be combined into one interface, and the second interface 12 and the fourth interface 14 of the low-temperature heat storage tank 1 can be combined into another interface; similarly, the high-temperature heat storage tank 3 in the steam production system of the present application can also modify the four interfaces into two interfaces, that is, the first interface 31 and the third interface 33 of the high-temperature heat storage tank 3 can be combined into one interface, and the second interface 32 and the fourth interface 34 of the high-temperature heat storage tank 3 can be combined into another interface. These changes do not affect the creative essence of the steam production system of the present application.

[0099] In addition, it can be understood that the above are only some illustrative embodiments of the steam production system of the present application, however, the embodiments of the steam production system of the present application are not limited thereto, and the schemes shown in the various embodiments of the steam production system shown above in the present application can be combined with each other according to actual conditions. Without departing from the creative essence of the present application, any combination or simple and equivalent transformation of the above embodiments will fall within the protection scope of the present application.

[0100] In some embodiments, the steam production system of the present application may have at least one operation mode among a first operation mode, a second operation mode, and a third operation mode.

[0101] The operation mode of the steam production system of the present application will be described in detail below using the scheme illustrated in the ninth embodiment.

[0102] During peak electricity price periods, the steam production system of the present application may be in a first operation mode, and the steam production system of the present application may use less electricity. Fig.10 The state diagram of the steam production system of the present application in the first operating mode is disclosed. Fig.10 As shown, in the steam production system of the present application, the first valve 81 and the second valve 82 are closed, the fourth valve 84 is opened, the flash compression unit 2 stops running, the second flash unit 4 is running, and the low-temperature heat storage tank 1 and the high-temperature heat storage tank 3 are both disconnected from the flash compression unit 2.

[0103] The high-temperature water stored in the high-temperature heat storage tank 3 generates steam through the second flash unit 4, and then enters the second compressor unit 5 to improve its quality and supply it to users. The flash return water with a lower temperature after flashing flows back to the high-temperature heat storage tank 3. At the same time, the low-temperature heat storage tank 1 is only connected to the heat source water supply pipeline 71 and the heat source return pipeline 72 at this time, and hot water is added to the low-temperature heat storage tank 1 to replace the original low-temperature water in the low-temperature heat storage tank 1 and enter the heat source return pipeline 72.

[0104] During the valley electricity price period, the steam production system of the present application may be in the second operation mode, and the steam production system of the present application may consume more electricity. Fig.11 The state diagram of the steam production system of the present application in the second operation mode is disclosed. Fig.11 As shown, in the steam production system of the present application, the first valve 81, the second valve 82 and the third valve 83 are all opened, the fourth valve 84 is closed, the flash compression unit 2 operates normally, the low-temperature heat storage tank 1 and the high-temperature heat storage tank 3 are connected to the flash compression unit 2, and the second flash unit 4 does not operate, wherein the low-temperature heat storage tank 1 releases heat and the high-temperature heat storage tank 3 stores heat.

[0105] When the bypass of the low-temperature heat storage tank 1 exists, the heat source water supply pipeline 71 enters the flash compression unit 2 in parallel with the pipeline at the third interface 13 of the low-temperature heat storage tank 1 through the bypass, and is connected to the water inlet 201 of the flash compression unit 2; part of the steam generated by the flash compression unit 2 is directly supplied to the user, and the other part of the steam is converted into hot water through the first heat exchange unit 23 and stored in the high-temperature heat storage tank 3. The heat source return water pipeline 72 enters the flash compression unit 2 through the bypass and is connected to the pipeline at the fourth interface 14 of the low-temperature heat storage tank 1 in parallel, and is connected to the return water port of the flash compression unit 2.

[0106] When the bypass of the low-temperature heat storage tank 1 does not exist, the heat source water supply pipeline 71 passes through the low-temperature heat storage tank 1 and the water in the low-temperature heat storage tank 1 and is sent out through the third interface 13 of the low-temperature heat storage tank 1, and the hot water is sent to the flash compression unit 2, and part of the generated steam is directly supplied to the user, and the other part of the steam is exchanged into hot water through the first heat exchange unit 23 and stored in the high-temperature heat storage tank 3. The return water of the flash compression unit 2 passes through the water outlet 202 and the fourth interface 14 of the low-temperature heat storage tank 1 and returns to the low-temperature heat storage tank 1. Part of the water passes through the low-temperature heat storage tank 1 and directly returns to the heat source water return pipeline 72, and the other part of the water is pushed out to the upper part of the low-temperature heat storage tank 1, and the water supply in the low-temperature heat storage tank 1 is pushed out from the third interface 13 of the low-temperature heat storage tank 1.

[0107] During the period of flat electricity prices, the steam production system of the present application is in the third operation mode. Fig.12 The state diagram of the steam production system of the present application in the third operation mode is disclosed. Fig.12As shown, in the steam production system of the present application, the first valve 81 is opened, the second valve 82, the third valve 83 and the fourth valve 84 are all closed, the flash compression unit 2 is partially operated, and the operating equipment capacity of the flash compression unit 2 is adjusted, so that during the flat period of power load, the steam production system only prepares the required steam, the first heat exchange unit 23 and the second flash unit 4 are not operated, wherein the low-temperature heat storage tank 1 does not release heat, and the high-temperature heat storage tank 3 does not store heat.

[0108] When the bypass of the low-temperature heat storage tank 1 exists, the heat source water supply pipeline 71 directly enters the water inlet 201 of the flash compression unit 2 through the bypass, and the water outlet 202 of the flash compression unit 2 is connected to the heat source water return pipeline 72.

[0109] When the bypass of the low-temperature heat storage tank 1 does not exist, hot water passes through the low-temperature heat storage tank 1 from the heat source water supply pipeline 71, enters the water inlet 201 of the flash compression unit 2 from the third interface 13 of the low-temperature heat storage tank 1, and the return water passes through the water outlet 202 of the flash compression unit 2 and is connected to the fourth interface 14 of the low-temperature heat storage tank 1, and then is sent to the heat source return water pipeline 72.

[0110] The steam production system of the present application changes the steam production path by adjusting the operation strategy of different electricity consumption periods. During the period of high electricity price, the high-temperature water stored in the high-temperature heat storage tank 3 is used to produce the required steam by flash evaporation; during the period of low electricity price, the flash evaporation compression unit 2 is used to recover the heat of the low-temperature water in the low-temperature heat storage tank 1, and the required steam is produced while storing heat in the high-temperature heat storage tank 3.

[0111] The steam production system of the present application absorbs electricity during periods of low electricity prices and reduces electricity consumption during periods of high electricity prices. While achieving the peak shaving and valley filling function and assisting in the regulation of the power system, it utilizes the peak-valley electricity price difference on the user side, reduces operating costs, improves economy, and broadens the application scenarios of water transmission and steam production.

[0112] The present application also provides a control method for a steam production system. The steam production system may include a flash compression unit 2, a high-temperature heat storage tank 3, and a second flash unit 4, wherein the flash compression unit 2 includes a first heat exchange unit 23. The control method for a steam production system of the present application may include steps S1 to S2.

[0113] In step S1, combined with reference Fig.10 As shown, during the peak electricity price period, the steam production system can be controlled to be in the first operation mode, wherein, in the first operation mode, the flash compression unit 2 is controlled to stop running, the high-temperature heat storage tank 3 is disconnected from the flash compression unit 2, and the high-temperature water stored in the high-temperature heat storage tank 3 is flashed into steam through the second flash unit 4 to supply users.

[0114] In step S2, combined with reference Fig.11As shown, during the valley electricity price period, the steam production system can be controlled to be in the second operating mode, wherein in the second operating mode, the flash compression unit 2 is controlled to operate normally, a part of the steam after flash compression of the hot water by the flash compression unit 2 is directly supplied to the user, and the other part of the steam is converted into hot water through the first heat exchange unit 23 in the flash compression unit 2 and then stored in the high-temperature heat storage tank 3.

[0115] In some embodiments, the control method of the steam production system of the present application may further include step S3.

[0116] In step S3, combined with reference Fig.12 As shown, during the flat electricity price period, the steam production system can be controlled to be in the third operation mode, wherein, in the third operation mode, the flash compression unit 2 is controlled to partially operate, the flash compression unit 2 is disconnected from the high-temperature heat storage tank 3, the first heat exchange unit 23 and the second flash unit 4 are not operated, and the hot water is directly supplied to the user through the steam after flash compression by the flash compression unit 2, and the high-temperature heat storage tank 3 does not store heat.

[0117] The steam production system may further include a second compressor unit 5. Therefore, in some embodiments, the control method of the steam production system of the present application may further include step S4.

[0118] In step S4 , the steam flashed by the second flash unit 4 may be further compressed by the second compressor unit 5 and supplied to users.

[0119] The steam production system may further include a low-temperature heat storage tank 1. Therefore, in some embodiments, step S1 may further include: in the first operating mode, the low-temperature heat storage tank 1 is disconnected from the flash compression unit 2, and the low-temperature heat storage tank 1 is controlled to be connected only to the heat source water supply pipeline 71 and the heat source return water pipeline 72, and the hot water in the heat source water supply pipeline 71 is supplemented into the low-temperature heat storage tank 1, and enters the heat source return water pipeline 72 after replacing the original low-temperature water in the low-temperature heat storage tank 1. Step S2 may further include: in the second operating mode, the hot water in the heat source water supply pipeline 71 and the hot water in the low-temperature heat storage tank 1 enter the flash compression unit 2 together, wherein the low-temperature heat storage tank 1 releases heat. Step S3 may further include: in the third operating mode, only the hot water in the heat source water supply pipeline 71 enters the flash compression unit 2, wherein the low-temperature heat storage tank 1 does not release heat.

[0120] The control method of the steam production system of the present application adopts a steam making method that consumes excess renewable energy power and transmits water to make steam, thereby overcoming the problem of poor economic efficiency of traditional steam making methods.

[0121] The control method of the steam production system of the present application utilizes a high-temperature heat storage tank 3, a low-temperature heat storage tank 1 and a flash compression unit 2 to transfer electricity from a period of low electricity prices to a period of high electricity prices, thereby facilitating the consumption of renewable energy and the regulation of the power grid.

[0122] The control method of the steam production system of the present application improves the economy of the steam production system by adjusting the operation strategies in different time periods, changing the equipment operation mode in different electricity price periods, using more electricity in low electricity price periods, and reducing electricity in high electricity price periods.

[0123] The steam production system and control method thereof provided in the embodiment of the present application are introduced in detail above. Specific examples are used herein to illustrate the steam production system and control method thereof in the embodiment of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A steam production system, characterized in that: include: A flash compression unit has a water inlet and a water outlet, wherein the water inlet and the water outlet of the flash compression unit are respectively used to be connected to a heat source water supply pipeline and a heat source return pipeline, and the flash compression unit comprises a first flash unit, a first compressor unit and a first heat exchange unit, wherein the water inlet and the water outlet of the first flash unit are respectively connected to the water inlet and the water outlet of the flash compression unit, and the steam outlet of the first flash unit is connected to the steam inlet of the first compressor unit; the steam outlet of the first compressor unit is used to supply steam to a user and is connected to a first interface of the first heat exchange unit; the second interface of the first heat exchange unit is connected to the water outlet of the first flash unit; A high-temperature heat storage tank, wherein the first interface and the second interface of the high-temperature heat storage tank are respectively connected to the third interface and the fourth interface of the first heat exchange unit in the flash compression unit; A second flash unit, wherein the water inlet and the water outlet of the second flash unit are respectively connected to the third interface and the fourth interface of the high-temperature heat storage tank, and the steam outlet of the second flash unit is used to supply steam to a user.

2. The steam production system according to claim 1, characterized in that: It also includes a low-temperature heat storage tank, and the flash compression unit is used to connect to the heat source water supply pipeline and the heat source water return pipeline through the low-temperature heat storage tank, wherein: The first interface and the second interface of the low-temperature heat storage tank are respectively used to connect to the heat source water supply pipeline and the heat source return pipeline, and the third interface and the fourth interface of the low-temperature heat storage tank are respectively connected to the water inlet and the water outlet of the flash compression unit.

3. The steam production system according to claim 2, characterized in that: The first interface and the third interface of the low-temperature heat storage tank are connected through a first bypass pipeline, and the second interface and the fourth interface of the low-temperature heat storage tank are connected through a second bypass pipeline.

4. The steam production system according to claim 2, characterized in that: The second flash unit also includes a second compressor unit, and the second flash unit supplies steam to a user through the second compressor unit. The steam outlet of the second flash unit is connected to the steam inlet of the second compressor unit, and the steam outlet of the second compressor unit is used to supply steam to a user.

5. The steam production system according to claim 2, characterized in that: The second flash unit is used to supply steam to a user through the first compressor unit, wherein a steam outlet of the second flash unit is connected to a steam inlet of the first compressor unit.

6. The steam production system according to any one of claims 1 to 5, characterized in that: The flash compression unit further comprises a second heat exchange unit, wherein: The first interface and the second interface of the second heat exchange unit are respectively connected to the water inlet and the water outlet of the flash compression unit, and the third interface and the fourth interface of the second heat exchange unit are respectively connected to the water inlet and the water outlet of the first flash unit.

7. The steam production system according to any one of claims 1 to 5, characterized in that: The flash compression unit also includes a heat pump unit, wherein: The first interface and the second interface of the heat pump unit are respectively connected to the water inlet and the water outlet of the flash compression unit, and the third interface and the fourth interface of the heat pump unit are respectively connected to the water inlet and the water outlet of the first flash unit.

8. The steam production system according to any one of claims 1 to 5, characterized in that: The first flash unit comprises a plurality of first flash evaporators, which are sequentially connected in series, wherein a water inlet of the first flash evaporator of the first stage and a water outlet of the first flash evaporator of the last stage serve as a water inlet and a water outlet of the first flash unit respectively, and the water outlets and water inlets of two adjacent first flash evaporators are connected; The first compressor unit includes a plurality of first compressors, which are connected in series in sequence, wherein the steam outlet of each first flash evaporator is respectively connected to the steam inlet of the corresponding first compressor, and the steam outlet and steam inlet of two adjacent first compressors are connected.

9. The steam production system according to any one of claims 1 to 5, characterized in that: The first compressor unit comprises a plurality of first compressors, the plurality of first compressors are connected in series in sequence, and the steam outlets and steam inlets of two adjacent first compressors are connected; The first heat exchange unit includes multiple stages of first heat exchangers, which are connected in series in sequence, wherein the third interface of the first stage of the first heat exchanger and the fourth interface of the last stage of the first heat exchanger are respectively connected to the first interface and the second interface of the high-temperature heat storage tank, the first interface and the second interface of each stage of the first heat exchanger are respectively connected to the steam outlet and the steam inlet of the corresponding first stage of the first compressor, and the fourth interface and the third interface of the first heat exchangers of two adjacent stages are connected.

10. A control method for a steam production system, the steam production system comprising a flash compression unit, a high-temperature heat storage tank and a second flash unit, the flash compression unit comprising a first heat exchange unit, characterized in that: The control method comprises: During the peak electricity price period, the steam production system is controlled to be in a first operation mode, wherein, in the first operation mode, the flash compression unit is controlled to stop operating, the high-temperature heat storage tank is disconnected from the flash compression unit, and the high-temperature water stored in the high-temperature heat storage tank is flashed into steam by the second flash unit to supply users; During the valley electricity price period, the steam production system is controlled to be in the second operation mode, wherein in the second operation mode, the flash compression unit is controlled to operate normally, a part of the steam after flash compression of hot water by the flash compression unit is directly supplied to the user, and the other part of the steam is converted into hot water by the first heat exchange unit in the flash compression unit and then stored in the high-temperature heat storage tank.

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