Coupling flash evaporation tandem type spherical heat storage water tank system and interface control method

Abstract

The invention discloses a coupling flash evaporation serial connection type spherical heat storage water tank system which comprises a flash evaporation tank, a cell type serial connection heat storage water tank system and a two-stage parallel connection system. The two-stage parallel system is formed by combining two unit systems in parallel, and each unit system is formed by combining two same cell type serial heat storage water tank systems in parallel. The invention provides an interface control method for a coupling flash evaporation tandem type spherical heat storage water tank system. The temperature and flow of heat supply or heat storage of each two-stage parallel system are distributed and set in the heat release or heat storage period, the states of two unit systems in each two-stage parallel system can be heat release or one storage and one release at the same time, and meanwhile, two cell type serial heat storage water tank systems are arranged in each unit system to alternately store heat or release heat. 24-hour uninterrupted heat release of various temperature qualities can be achieved, and meanwhile the problem that cold water and hot water are difficult to transfer between spherical tanks due to the density difference is solved.

Description

Technical Field

[0001] The invention relates to a coupled flash evaporation series spherical hot water storage tank system and an interface control method, belonging to the technical field of energy-saving of heat storage and heating systems in thermal power plants. Background Art

[0002] To improve the thermal-electric decoupling capabilities of thermal power plants, they use hot water storage tanks to store excess heat during periods of low heat demand or peak electricity load, while also providing heat during peak heat demand or periods of low electricity load. Hot water storage tanks can enhance the overall plant-level flexibility and economic efficiency of thermal power plants. Hot water storage tanks used in thermal power plants are typically atmospheric cylindrical structures, which require a large floor space, require high welding standards, and have a thick incline layer, limiting the large-scale application of large hot water storage tanks in thermal power plants. Spherical hot water storage tanks address some of the floor space issues and can save a certain amount of steel. However, the presence of an incline layer limits the heat storage and release capacity. Furthermore, the cross-sectional area of spherical hot water storage tanks varies continuously at different heights, placing extremely high demands on the stability of the heat storage and release system and the flow control system for the water inlet and outlet. This compromises the stability of the incline layer and can easily lead to mixing of hot and cold water, affecting overall efficiency. Comparative proposal CN 116045708A demonstrates a spherical tank heat storage system. Although this system does not utilize an incline layer, it suffers from the following deficiencies in actual engineering applications:

[0003] 1) When charging and discharging cold water and hot water in the spherical tank, they will be affected by the flow imbalance caused by the density difference. In actual application, the cold water flow rate is 5% to 10% larger than the hot water flow rate, making it impossible to transfer cold and hot water between the spherical tanks. The comparison scheme does not provide a solution.

[0004] 2) The comparative solution cannot continue to store or release heat when the nitrogen reaches the boundary spherical tank. It still needs to rely on the spherical tank heat storage system with a large footprint and scale, which makes it difficult to meet the large-scale continuous heat release requirements.

[0005] When faced with large-scale renewable fluctuating heat sources, it is necessary to realize the variable temperature characteristics of heat storage and release to enhance the flexibility of heat storage and release, but the hot and cold water in the comparison scheme are both constant temperature. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of existing technologies by providing a coupled flash evaporation series spherical hot water tank system and interface control method. By flexibly combining a large number of cellular hot water tanks, setting and regulating a large number of shutoff valves, coupling the flash evaporation system with the spherical hot water tanks, and connecting the spherical hot water tanks in series and parallel, a continuous heat storage and release process with flexible temperature variation is achieved.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] The present invention provides a coupled flash evaporation series spherical hot water storage tank system, comprising:

[0009] Flash tank, cell-type series hot water storage tank system (34), two-stage parallel system;

[0010] The cell-type series hot water storage tank system (34) comprises a water pump (7) in front of the tank, an electric regulating valve (8) in front of the tank, an electromagnetic flowmeter (2) in front of the tank, a pressure reducing valve (1) in front of the tank, a speed regulating valve (3) in front of the tank, a water pump (10) in the back of the tank, an electric regulating valve (9) in the back of the tank, an electromagnetic flowmeter (5) in the back of the tank, a pressure reducing valve (6) in the back of the tank, a speed regulating valve (4) in the back of the tank, a micro-cell-type spherical hot water storage tank, a first electric regulating valve (11) between the tanks, a second electric regulating valve (12) between the tanks, a third electric regulating valve (14) between the tanks, a fourth electric regulating valve (15) between the tanks, and a water pump (13) between the tanks.

[0011] The flash tank comprises a tank body (33), a steam inlet pipe (32), a secondary steam outlet, an unflashed water outlet, and a steam inlet valve (31);

[0012] The two-stage parallel system is composed of two unit systems connected in parallel, and the unit system is composed of two identical cell-type series hot water storage tank systems (34) connected in parallel.

[0013] Furthermore, the micro-cell type spherical hot water storage tank comprises a cylinder body (16), an upper main water inlet pipe (19), a lower main water outlet pipe (20), an upper front water inlet pipe (18), an upper rear water inlet pipe (17), a lower front water outlet pipe (21), a lower rear water outlet pipe (22), a sewage pipe (30), a sewage valve (29), a vent pipe (24), a vent valve (23), a gas inlet pipe (26), an auxiliary water inlet pipe (28), a gas inlet valve (25), and an auxiliary water inlet valve (27). The sewage valve (29) is connected to the sewage pipe (30), the vent valve (23) is connected to the vent pipe (24), the vent pipe (24) and the sewage pipe (30) are directly connected to the atmosphere, the auxiliary water inlet valve (27) is connected to the auxiliary water inlet pipe (28), and the gas inlet valve (25) is connected to the gas inlet pipe (26).

[0014] Furthermore, the steam inlet valve (31) is connected to the steam inlet pipe (32), and the steam inlet pipe (32) can be connected to the sewage pipe outlet of the waste heat boiler of the thermal power plant, the medium-pressure steam pipe outlet of the thermal power plant, or the high-pressure black water discharge pipe outlet of methanol and synthetic ammonia in the hydrogen production process, etc. The secondary steam outlet is connected to the gas inlet pipe (26) of the micro-cell type spherical hot water storage tank, and the unflashed water outlet is connected to the auxiliary water inlet pipe (28) of the micro-cell type spherical hot water storage tank.

[0015] Furthermore, the first electric regulating valve (11) between tanks is arranged on the upper rear water inlet pipe (17) of the micro-cellular spherical water storage tank, the second electric regulating valve (12) between tanks is arranged on the upper front water inlet pipe (18) of the micro-cellular spherical water storage tank, the third electric regulating valve (14) between tanks is arranged on the lower front water outlet pipe (21) of the micro-cellular spherical water storage tank, the fourth electric regulating valve (15) between tanks is arranged on the lower rear water outlet pipe (22) of the micro-cellular spherical water storage tank, the water pump (13) between tanks is arranged on the main water supply pipe (35) between tanks, and the main water supply pipe (35) between tanks is connected to the upper front water inlet pipe (18), the upper rear water inlet pipe (17), the lower front water outlet pipe (21), and the lower rear water outlet pipe (22) of the micro-cellular spherical water storage tank.

[0016] Furthermore, each unit system in the two-stage parallel system can realize internal circulation, and the internal circulation means that the cold water or hot water released by one unit system can be partially supplied to another unit system, and at the same time, the supply of one unit system can also be partially provided by another unit system.

[0017] The present invention also provides an interface control method for a coupled flash evaporation series spherical hot water storage tank system, comprising:

[0018] Step S1: During the non-heat storage and release period, all valves and water pumps are closed;

[0019] Step S2: During the heat storage and release period, analyze the heat load demand of the heat network and the heat source output. Since the coupled flash evaporation series spherical water storage tank system can be composed of any two-stage parallel systems, preliminarily set the overall flow range of the coupled flash evaporation series spherical water storage tank system based on the hydraulic and thermal characteristics of the two-stage parallel system;

[0020] Step S3, during the heat release period, the heating temperature and flow rate of each two-stage parallel system are allocated and set, and then in each two-stage parallel system, the state of two unit systems is set to release heat at the same time or store and release heat at the same time, and at the same time, two cell-type series hot water storage tank systems (34) are set inside each unit system for alternating heat release, and the flow rate difference caused by the density difference between cold and hot water during the heat release process is compensated by the hot water flow provided by the unflashed water outlet of the flash tank, and the steam constant pressure required for the heat release process is provided by the secondary steam outlet of the flash tank;

[0021] Step S4, during the heat storage period, the heat storage temperature and flow rate of each two-stage parallel system are allocated and set, and then in each two-stage parallel system, the state of two unit systems is set to be heat storage at the same time or one storage and one release, and at the same time, two cell-type series hot water storage tank systems (34) are set inside each unit system for alternating heat storage, and the flow difference caused by the density difference between cold and hot water during the heat storage process is compensated by the hot water flow provided by the unflashed water outlet of the flash tank, and the steam constant pressure required for the heat storage process is provided by the secondary steam outlet of the flash tank.

[0022] Furthermore, the step S3 includes the following details:

[0023] S31. The above-mentioned distribution and setting of the heating temperature and flow of each two-stage parallel system introduces the idea of heat network quality regulation, and evenly distributes the overall flow to each two-stage parallel system. Each two-stage parallel system provides heat according to the step temperature and satisfies the following relationship:

[0024]

[0025] Where m i is the flow rate of the two-stage parallel system i, h i is the enthalpy of the two-stage parallel system i, T i and P i are the temperature and pressure of the two-stage parallel system i, N H is the number of two-stage parallel systems, Q G is the total heating load;

[0026] S32, wherein the states of the two unit systems can be simultaneously in the heat release state or one storage and the other release state. When the heat release heat load is large, the states of the two unit systems can be simultaneously in the heat release state. When the heat release heat load is small, by setting one unit system to release heat and the other unit system to store heat, the unit-level internal water mixing and temperature adjustment are achieved, thereby achieving the function of precise temperature control;

[0027] S33, the two cell-type series hot water storage tank systems (34) are set to release heat alternately, and the alternating heat release is performed according to the following rules. Each cell-type series hot water storage tank system (34) is assumed to be composed of three series-connected micro-cell-type spherical hot water storage tanks, where O, H, C, and - represent steam, hot water, cold water, and connecting pipes respectively:

[0028] 1) Cellular series hot water storage tank system (34) #1: HHH->OHH->CHH->COH->CCH->CCO;

[0029] 2) Cellular series hot water storage tank system (34) #2: OHH->CHH->COH->CCH->CCO->CCC;

[0030] S34. When all two-stage parallel systems are in a one-storage-one-release state, the heat stored in the heat storage process can timely supplement the heat released in the heat release process, achieving 24-hour uninterrupted heat release.

[0031] Furthermore, the step S4 includes the following details:

[0032] S41. The heat storage temperature and flow rate of each two-stage parallel system are allocated and set. The idea of heat network regulation is introduced. Each two-stage parallel system stores heat according to the step temperature. The overall flow rate is allocated according to the temperature setting of each two-stage parallel system, and the following relationship is satisfied:

[0033]

[0034] Where m i is the flow rate of the two-stage parallel system i, h i is the enthalpy of the two-stage parallel system i, T i and P i are the temperature and pressure of the two-stage parallel system i, N H is the number of two-stage parallel systems, Q C is the total thermal storage heat load;

[0035] S42, wherein the states of the two unit systems can be simultaneously in heat storage or one storing and the other releasing. When the heat storage heat load is large, the states of the two unit systems can be simultaneously in heat storage. When the heat storage heat load is small, by setting one unit system to release heat and the other unit system to store heat, the function of simultaneous heat storage and heat release is achieved;

[0036] S43, the two cell-type series hot water storage tank systems (34) are set up for alternating heat storage, and the alternating heat storage is performed according to the following rules. Each cell-type series hot water storage tank system (34) is assumed to be composed of three series-connected micro-cell-type spherical hot water storage tanks, where O, H, C, and - represent steam, hot water, cold water, and connecting pipes, respectively:

[0037] 1) Cellular series hot water storage tank system (34) #1: CCO->CCH->COH->CHH->OHH->HHH;

[0038] Cellular series hot water storage tank system (34) #2: CCC->CCO->CCH->COH->CHH->OHH.

[0039] The beneficial effects of the present invention are as follows: the present invention improves the flexibility of the hot water storage tank under heat storage and heat release conditions, and at the same time, large-scale heat storage applications can be achieved through a combination of smaller cell-type hot water storage tanks, which allows thermal power plants to flexibly adopt different assembly capacities according to their own heat loads, and facilitates the maintenance and transformation of thermal power plants. In addition, the cell-type series-connected spherical hot water storage tanks of the present invention eliminate the inclined temperature layer of traditional spherical hot water storage tanks, and there is no need to consider the mixing of hot and cold water, which greatly improves the overall availability and work efficiency of the hot water storage tanks. By coupling the flash tank, the present invention can alleviate the situation where the flow of hot and cold water is unequal due to density differences in actual applications, and helps to realize the transfer of hot and cold water between spherical tanks. The two-stage parallel system provided by the present invention can meet large-scale 24-hour continuous heat release requirements.

[0040] Other features and advantages will be described in the following description, and in part will become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 It is a schematic diagram of the cell-type series hot water storage tank system (34) of the present invention;

[0044] Figure 2 This is a structural diagram of a micro-cell spherical hot water storage tank according to the present invention;

[0045] Figure 3 This is a schematic diagram of a coupled flash evaporation series spherical hot water storage tank system of the present invention, which includes two two-stage parallel systems;

[0046] Figure 4 The present invention is a flow chart of an interface control method for a coupled flash evaporation series spherical hot water storage tank system.

[0047] In the figure, 1 is the pressure reducing valve before the tank, 2 is the electromagnetic flowmeter before the tank, 3 is the speed regulating valve before the tank, 4 is the speed regulating valve after the tank, 5 is the electromagnetic flowmeter after the tank, 6 is the pressure reducing valve after the tank, 7 is the water pump before the tank, 8 is the electric regulating valve before the tank, 9 is the electric regulating valve after the tank, 10 is the water pump after the tank, 11 is the first electric regulating valve between the tanks, 12 is the second electric regulating valve between the tanks, 13 is the water pump between the tanks, 14 is the third electric regulating valve between the tanks, 15 is the fourth electric regulating valve between the tanks, 16 is the cylinder body, 17 is the upper rear water inlet pipe, 18 is the upper front water inlet pipe, 1 9 is the upper main water inlet pipe, 20 is the lower main water outlet pipe, 21 is the lower front water outlet pipe, 22 is the lower rear water outlet pipe, 23 is the air release valve, 24 is the air release pipe, 25 is the gas inlet valve, 26 is the gas inlet pipe, 27 is the auxiliary water inlet valve, 28 is the auxiliary water inlet pipe, 29 is the sewage valve, 30 is the sewage pipe, 31 is the steam inlet valve, 32 is the steam inlet pipe, 33 is the tank body, 34 is the cell-type series hot water storage tank system, and 35 is the main water supply pipe between tanks. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment first provides a structural method of a cell-type series hot water storage tank system (34), which includes a tank front water pump (7) ( Figure 1 P1 in the tank), electric regulating valve (8) ( Figure 1 M1 in), electromagnetic flowmeter before tank (2), pressure reducing valve before tank (1), speed regulating valve before tank (3), water pump after tank (10) ( Figure 1 P7 in), electric regulating valve after tank (9) ( Figure 1 M12 in the tank), electromagnetic flowmeter after the tank (5), pressure reducing valve after the tank (6), speed regulating valve after the tank (4), micro cell type spherical hot water storage tank ( Figure 1 S1, S2, S3, S4, S5, S6), the first electric regulating valve (11) between tanks ( Figure 1 M2, M4, M6, M8, M10), the second electric regulating valve (12) between tanks ( Figure 1 M3, M5, M7, M9, M11), the third electric regulating valve (14) between tanks ( Figure 1 M13, M15, M17, M19, M21), the fourth electric regulating valve (15) between tanks ( Figure 1M14, M16, M18, M20, M22), tank water pump (13) ( Figure 1 P2, P3, P4, P5, P6), the main water supply pipeline between tanks (35). Among them, the first electric regulating valve (11) between tanks ( Figure 1 M2, M4, M6, M8, M10) are arranged on the upper rear water inlet pipe (17) of the micro cell type spherical hot water storage tank, and the second electric regulating valve (12) ( Figure 1 M3, M5, M7, M9, M11) are arranged on the upper front water pipe (18) of the micro cell type spherical hot water storage tank, and the third electric regulating valve (14) ( Figure 1 M13, M15, M17, M19, M21) are arranged on the lower front outlet pipe (21) of the micro cell type spherical hot water storage tank, and the fourth electric regulating valve (15) ( Figure 1 M14, M16, M18, M20, M22) are arranged on the lower rear outlet pipe (22) of the micro cell type spherical hot water storage tank, and the tank water pump (13) ( Figure 1 P2, P3, P4, P5, P6) are arranged on the main water supply pipe (35) between tanks, and the main water supply pipe (35) between tanks is connected to the upper front water supply pipe (18), the upper rear water supply pipe (17), the lower front water outlet pipe (21), and the lower rear water outlet pipe (22) of the micro-cell type spherical hot water storage tank.

[0051] like Figure 2 As shown, this example describes in detail the structure of the main components of the cell-type series hot water storage tank system (34), namely, the micro-cell-type spherical hot water storage tank and the flash tank. The micro-cell-type spherical hot water storage tank includes a cylinder (16), an upper main water inlet pipe (19), a lower main water outlet pipe (20), an upper front water inlet pipe (18), an upper rear water inlet pipe (17), a lower front water outlet pipe (21), a lower rear water outlet pipe (22), a sewage pipe (30), a sewage valve (29), a vent pipe (24), a vent valve (23), a gas inlet pipe (26), an auxiliary water inlet pipe (28), a gas inlet valve (25), and an auxiliary water inlet valve (27). The sewage discharge valve (29) is connected to the sewage discharge pipe (30), the air release valve (23) is connected to the air release pipe (24), the air release pipe (24) and the sewage discharge pipe (30) are directly connected to the atmosphere, the auxiliary water inlet valve (27) is connected to the auxiliary water inlet pipe (28), and the gas inlet valve (25) is connected to the gas inlet pipe (26).

[0052] Figure 2The structure connected to the tank body (33) of the flash tank includes a steam inlet pipe (32), a secondary steam outlet, an unflashed water outlet, and a steam inlet valve (31). The steam inlet valve (31) is connected to the steam inlet pipe (32), and the steam inlet pipe (32) can be connected to the sewage outlet of the waste heat boiler of the thermal power plant, the medium-pressure steam outlet of the thermal power plant, or the high-pressure black water outlet of methanol and synthetic ammonia in the hydrogen production process, etc. The secondary steam outlet is connected to the gas inlet pipe (26) of the micro-cell spherical hot water storage tank, and the unflashed water outlet is connected to the auxiliary water inlet pipe (28) of the micro-cell spherical hot water storage tank.

[0053] like Figure 3 As shown in FIG. 1 , this embodiment provides a structure of a coupled flash evaporation series spherical hot water storage tank system. As can be seen from the figure, a coupled flash evaporation series spherical hot water storage tank system is composed of two two-stage parallel systems. Among them, a two-stage parallel system is composed of two unit systems connected in parallel, and a unit system is composed of two identical cell-type series hot water storage tank systems (34) (such as Figure 3 R1 and R2, R3 and R4, R5 and R6, R7 and R8) are connected in parallel.

[0054] Therefore, each unit system in the two-stage parallel system can achieve internal circulation. This internal circulation means that the cold water or hot water released by one unit system can be partially supplied to another unit system, and at the same time, the supply of one unit system can also be partially provided by another unit system. This can increase the flexibility of the overall hot water storage tank heat supply and storage, while reducing the impact of flow rate changes in the heat storage mixed water on the heating network.

[0055] Example 2

[0056] like Figure 4 As shown, this embodiment provides an interface control method for a coupled flash evaporation series spherical hot water storage tank system, comprising:

[0057] Step S1: First, determine whether it is a heat storage and release period. If not, all valves and water pumps are closed; if so, proceed to step S2;

[0058] Step S2: Analyze the heat load demand and heat source output of the heating network. Since the coupled flash evaporation series spherical water storage tank system can be composed of any two-stage parallel systems, the overall flow rate range of the coupled flash evaporation series spherical water storage tank system is initially set based on the hydraulic and thermal characteristics of the two-stage parallel systems. The coupled flash evaporation series spherical water storage tank system maintains a relatively constant overall flow rate under fluctuating heat source and heat load conditions, thereby reducing the impact on the heating network.

[0059] Determine whether it is a heat storage / release period. If it is a heat release period, proceed to step S3; if it is a heat storage period, proceed to step S4;

[0060] Step S3: During the heat release period, the heating temperature and flow rate of each two-stage parallel system are allocated and set. The idea of heat network quality regulation is introduced, and the overall flow rate is evenly distributed to each two-stage parallel system. Each two-stage parallel system provides heat according to the step temperature and satisfies the following relationship:

[0061]

[0062] Where m i is the flow rate of the two-stage parallel system i, h i is the enthalpy of the two-stage parallel system i, T i and P i are the temperature and pressure of the two-stage parallel system i, N H is the number of two-stage parallel systems, Q G is the total heating load;

[0063] Then, in each two-stage parallel system, the states of two unit systems can be set to release heat at the same time or store heat and release heat at the same time. When the heat release heat load is large, the states of the two unit systems can be set to release heat at the same time. When the heat release heat load is small, by setting one unit system to release heat and the other unit system to store heat, the internal water mixing and temperature adjustment of the unit level are realized, which plays the role of precise temperature control.

[0064] At the same time, two cell-type series hot water storage tank systems (34) are set up inside each unit system (such as Figure 3 R1 and R2, R3 and R4, R5 and R6, R7 and R8) are alternate heat release, and alternate heat release is performed according to the following rules. Each cell type series hot water storage tank system (34) (such as Figure 3 R1, R2, R3, R4, R5, R6, R7, R8) are assumed to be composed of three micro-cell spherical hot water storage tanks connected in series ( Figure 1 There are 6 in total, S1 to S6, but here we assume 3 for simplicity), where O, H, C, and - represent steam, hot water, cold water, and connecting pipes, respectively:

[0065] 1) Cellular Series Hot Water Storage Tank System (34) #1 (e.g. Figure 3 R1, R3, R5, R7): HHH->OHH->CHH->COH->CCH->CCO;

[0066] 2) Cellular Series Hot Water Storage Tank System (34) #2 (e.g. Figure 3 R2, R4, R6, R8): OHH->CHH->COH->CCH->CCO->CCC;

[0067] During the heat release process, the flow difference caused by the density difference between cold and hot water is compensated by the hot water flow provided by the unflashed water outlet of the flash tank. At the same time, the steam constant pressure required for the heat release process is provided by the secondary steam outlet of the flash tank.

[0068] When all two-stage parallel systems are in a state of one storage and one release, the heat stored in the heat storage process can timely supplement the heat released in the heat release process, achieving 24-hour uninterrupted heat release;

[0069] Step S4: During the heat storage period, the heat storage temperature and flow rate of each two-stage parallel system are allocated and set. The idea of heat network regulation is introduced. Each two-stage parallel system stores heat according to the step temperature. The overall flow rate is distributed according to the temperature setting of each two-stage parallel system, and the following relationship is satisfied:

[0070]

[0071] Where m i is the flow rate of the two-stage parallel system i, h i is the enthalpy of the two-stage parallel system i, T i and P i are the temperature and pressure of the two-stage parallel system i, N H is the number of two-stage parallel systems, Q C is the total thermal storage heat load;

[0072] Then, in each two-stage parallel system, the states of two unit systems can be set to heat storage at the same time or one storage and one release. When the heat storage heat load is large, the states of the two unit systems can be set to heat storage at the same time. When the heat storage heat load is small, by setting one unit system to release heat and the other unit system to store heat, the function of simultaneous heat storage and heat release is achieved;

[0073] At the same time, two cell-type series hot water storage tank systems (34) are set up inside each unit system (such as Figure 3 R1 and R2, R3 and R4, R5 and R6, R7 and R8) are alternate heat storage, and alternate heat storage is performed according to the following rules. Each cell-type series hot water storage tank system (34) (such as Figure 3 R1, R2, R3, R4, R5, R6, R7, R8) are assumed to be composed of three micro-cell spherical hot water storage tanks connected in series ( Figure 1 There are 6 in total, S1 to S6, but here we assume 3 for simplicity), where O, H, C, and - represent steam, hot water, cold water, and connecting pipes, respectively:

[0074] 1) Cellular Series Hot Water Storage Tank System (34) #1 (e.g. Figure 3 R1, R3, R5, R7): CCO->CCH->COH->CHH->OHH->HHH;

[0075] 2) Cellular Series Hot Water Storage Tank System (34) #2 (e.g. Figure 3 R2, R4, R6, R8): CCC->CCO->CCH->COH->CHH->OHH;

[0076] During the heat storage process, the flow difference caused by the density difference between cold and hot water is compensated by the hot water flow provided by the unflashed water outlet of the flash tank. At the same time, the steam constant pressure required for the heat storage process is provided by the secondary steam outlet of the flash tank.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can also be implemented in other ways. The system embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the systems, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment, or a portion of code, and the module, program segment, or a portion of code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified functions or actions, or can be implemented using a combination of dedicated hardware and computer instructions.

[0078] In addition, the functional modules in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0079] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A coupled flash evaporation series spherical hot water storage tank system, characterized in that it include: Flash tank, cell-type series hot water storage tank system (34), two-stage parallel system; The cell-type series hot water storage tank system (34) comprises a water pump (7) in front of the tank, an electric regulating valve (8) in front of the tank, an electromagnetic flowmeter (2) in front of the tank, a pressure reducing valve (1) in front of the tank, a speed regulating valve (3) in front of the tank, a water pump (10) in the back of the tank, an electric regulating valve (9) in the back of the tank, an electromagnetic flowmeter (5) in the back of the tank, a pressure reducing valve (6) in the back of the tank, a speed regulating valve (4) in the back of the tank, a micro-cell-type spherical hot water storage tank, a first electric regulating valve (11) between the tanks, a second electric regulating valve (12) between the tanks, a third electric regulating valve (14) between the tanks, a fourth electric regulating valve (15) between the tanks, and a water pump (13) between the tanks. The flash tank comprises a tank body (33), a steam inlet pipe (32), a secondary steam outlet, an unflashed water outlet, and a steam inlet valve (31); The two-stage parallel system is composed of two unit systems connected in parallel, and the unit system is composed of two identical cell-type series hot water storage tank systems (34) connected in parallel.

2. The coupled flash evaporation series spherical hot water storage tank system according to claim 1, characterized in that: The micro-cell type spherical hot water storage tank comprises a cylinder body (16), an upper main water inlet pipe (19), a lower main water outlet pipe (20), an upper front water inlet pipe (18), an upper rear water inlet pipe (17), a lower front water outlet pipe (21), a lower rear water outlet pipe (22), a sewage pipe (30), a sewage valve (29), a vent pipe (24), a vent valve (23), a gas inlet pipe (26), an auxiliary water inlet pipe (28), a gas inlet valve (25), and an auxiliary water inlet valve (27). The sewage valve (29) is connected to the sewage pipe (30), the vent valve (23) is connected to the vent pipe (24), the vent pipe (24) and the sewage pipe (30) are directly connected to the atmosphere, the auxiliary water inlet valve (27) is connected to the auxiliary water inlet pipe (28), and the gas inlet valve (25) is connected to the gas inlet pipe (26).

3. The coupled flash evaporation series spherical hot water storage tank system according to claim 1, characterized in that: The steam inlet valve (31) is connected to the steam inlet pipe (32), and the steam inlet pipe (32) can be connected to the sewage pipe outlet of the waste heat boiler of the thermal power plant, the medium-pressure steam pipe outlet of the thermal power plant, or the high-pressure black water discharge pipe outlet of methanol and synthetic ammonia in the hydrogen production process, etc. The secondary steam outlet is connected to the gas inlet pipe (26) of the micro-cell type spherical hot water storage tank, and the unflashed water outlet is connected to the auxiliary water inlet pipe (28) of the micro-cell type spherical hot water storage tank.

4. The coupled flash evaporation series spherical hot water storage tank system according to claim 1, characterized in that: The first electric regulating valve (11) between tanks is arranged on the upper rear water inlet pipe (17) of the micro-cellular spherical water storage tank, the second electric regulating valve (12) between tanks is arranged on the upper front water inlet pipe (18) of the micro-cellular spherical water storage tank, the third electric regulating valve (14) between tanks is arranged on the lower front water outlet pipe (21) of the micro-cellular spherical water storage tank, the fourth electric regulating valve (15) between tanks is arranged on the lower rear water outlet pipe (22) of the micro-cellular spherical water storage tank, the water pump (13) between tanks is arranged on the main water supply pipe (35) between tanks, and the main water supply pipe (35) between tanks is connected to the upper front water inlet pipe (18), the upper rear water inlet pipe (17), the lower front water outlet pipe (21), and the lower rear water outlet pipe (22) of the micro-cellular spherical water storage tank.

5. The coupled flash evaporation series spherical hot water storage tank system according to claim 1, characterized in that: Each unit system in the two-stage parallel system can realize internal circulation. The internal circulation means that the cold water or hot water released by one unit system can be partially supplied to another unit system, and at the same time, the supply of one unit system can also be partially provided by another unit system.

6. An interface control method using a coupled flash evaporation series spherical hot water storage tank system according to any one of claims 1 to 5, characterized in that: include: Step S1: During the non-heat storage and release period, all valves and water pumps are closed; Step S2: During the heat storage and release period, analyze the heat load demand of the heat network and the heat source output. Since the coupled flash evaporation series spherical water storage tank system can be composed of any two-stage parallel systems, preliminarily set the overall flow range of the coupled flash evaporation series spherical water storage tank system based on the hydraulic and thermal characteristics of the two-stage parallel system; Step S3, during the heat release period, the heating temperature and flow rate of each two-stage parallel system are allocated and set, and then in each two-stage parallel system, the state of two unit systems is set to release heat at the same time or store and release heat at the same time, and at the same time, two cell-type series hot water storage tank systems (34) are set inside each unit system for alternating heat release, and the flow rate difference caused by the density difference between cold and hot water during the heat release process is compensated by the hot water flow provided by the unflashed water outlet of the flash tank, and the steam constant pressure required for the heat release process is provided by the secondary steam outlet of the flash tank; Step S4, during the heat storage period, the heat storage temperature and flow rate of each two-stage parallel system are allocated and set, and then in each two-stage parallel system, the state of two unit systems is set to be heat storage at the same time or one storage and one release, and at the same time, two cell-type series hot water storage tank systems (34) are set inside each unit system for alternating heat storage, and the flow difference caused by the density difference between cold and hot water during the heat storage process is compensated by the hot water flow provided by the unflashed water outlet of the flash tank, and the steam constant pressure required for the heat storage process is provided by the secondary steam outlet of the flash tank.

7. The interface control method of a coupled flash evaporation series spherical hot water storage tank system according to claim 6, characterized in that: The step S3 includes the following details: S31. The above-mentioned distribution and setting of the heating temperature and flow of each two-stage parallel system introduces the idea of heat network quality regulation, and evenly distributes the overall flow to each two-stage parallel system. Each two-stage parallel system provides heat according to the step temperature and satisfies the following relationship: Where m i is the flow rate of the two-stage parallel system i, h i is the enthalpy of the two-stage parallel system i, T i and P i are the temperature and pressure of the two-stage parallel system i, N H is the number of two-stage parallel systems, Q G is the total heating load; S32, wherein the states of the two unit systems can be simultaneously in the heat release state or one storage and the other release state. When the heat release heat load is large, the states of the two unit systems can be simultaneously in the heat release state. When the heat release heat load is small, by setting one unit system to release heat and the other unit system to store heat, the unit-level internal water mixing and temperature adjustment are achieved, thereby achieving the function of precise temperature control; S33, the two cell-type series hot water storage tank systems (34) are set to release heat alternately, and the alternating heat release is performed according to the following rules. Each cell-type series hot water storage tank system (34) is assumed to be composed of three series-connected micro-cell-type spherical hot water storage tanks, where O, H, C, and - represent steam, hot water, cold water, and connecting pipes respectively: 1) Cellular series hot water storage tank system (34) #1: HHH->OHH->CHH->COH->CCH->CCO; 2) Cellular series hot water storage tank system (34) #2: OHH->CHH->COH->CCH->CCO->CCC; S34. When all two-stage parallel systems are in a one-storage-one-release state, the heat stored in the heat storage process can timely supplement the heat released in the heat release process, achieving 24-hour uninterrupted heat release.

8. The interface control method of a coupled flash evaporation series spherical hot water storage tank system according to claim 6, characterized in that: In the step S4, Include the following details: S41. The heat storage temperature and flow rate of each two-stage parallel system are allocated and set. The idea of heat network regulation is introduced. Each two-stage parallel system stores heat according to the step temperature. The overall flow rate is allocated according to the temperature setting of each two-stage parallel system, and the following relationship is satisfied: Where m i is the flow rate of the two-stage parallel system i, h i is the enthalpy of the two-stage parallel system i, T i and P i are the temperature and pressure of the two-stage parallel system i, N H is the number of two-stage parallel systems, Q C is the total thermal storage heat load; S42, wherein the states of the two unit systems can be simultaneously in heat storage or one storing and the other releasing. When the heat storage heat load is large, the states of the two unit systems can be simultaneously in heat storage. When the heat storage heat load is small, by setting one unit system to release heat and the other unit system to store heat, the function of simultaneous heat storage and heat release is achieved; S43, the two cell-type series hot water storage tank systems (34) are set up for alternating heat storage, and the alternating heat storage is performed according to the following rules. Each cell-type series hot water storage tank system (34) is assumed to be composed of three series-connected micro-cell-type spherical hot water storage tanks, where O, H, C, and - represent steam, hot water, cold water, and connecting pipes, respectively: 1) Cellular series hot water storage tank system (34) #1: CCO->CCH->COH->CHH->OHH->HHH; 2) Cellular series hot water storage tank system (34) #2: CCC->CCO->CCH->COH->CHH->OHH.

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