A steam accumulator heat release system and method

Abstract

The present invention discloses a steam accumulator heat release system and method, belonging to the technical field of steam energy storage and energy release, wherein a pressure regulating valve group is used to adjust the steam pressure output by the steam accumulator connected thereto; a first steam collecting box is connected to the pressure regulating valve group, and the first steam collecting box is used to mix the steam output by different pressure regulating valve groups; a heat exchange component is used to heat the temperature of the steam discharged from the first steam collecting box to a set temperature; a flow regulating valve group is used to adjust the steam flow output by the heat exchange component; a second steam collecting box is connected to the flow regulating valve group, and the second steam collecting box is used to mix the steam output by different flow regulating valve groups, and the second steam collecting box is provided with a steam output port. The present invention utilizes the pressure regulating valve group and the first steam collecting box to make the steam reach the set pressure; utilizes the heat exchange component to make the steam reach the set temperature; utilizes the flow regulating valve group and the second steam collecting box to make the steam reach the set flow; and finally can provide superheated steam with stable flow and pressure to the outside.

Description

Technical Field

[0001] The invention relates to the technical field of steam energy storage and release, and in particular to a steam accumulator heat release system and method. Background Art

[0002] As the world's awareness of environmental protection and sustainable development increases, higher requirements are placed on the transformation of energy structure and the flexibility of power systems. In particular, the large-scale grid connection of renewable energy such as wind power and photovoltaics, with its inherent intermittent and volatile nature, poses a challenge to the stable operation of the power grid. Therefore, improving the load regulation capacity of traditional thermal power units and nuclear power units to effectively balance the fluctuations of renewable energy power has become a key issue that needs to be urgently addressed in the current power industry.

[0003] However, frequent load regulation not only reduces the power generation efficiency and economic benefits of power plants, but also accelerates equipment wear, shortens equipment life, and may threaten the safety of unit operation. To solve this problem, the industry has begun to explore the introduction of energy storage technologies, such as steam accumulators, to enhance the peak and frequency regulation capabilities of power plants, so as to more flexibly respond to fluctuations in renewable energy power.

[0004] In the practical application of steam accumulators, especially when two or more steam accumulators are configured in parallel, significant technical challenges are faced.

[0005] First, the pressure of saturated steam released by a steam accumulator naturally decreases as its internal pressure decreases. However, in many application scenarios, the steam accumulator is required to provide saturated steam with stable pressure to meet specific process requirements. Currently, no mature and effective technical solution has been proposed for the pressure control of the steam accumulator during the steam release process.

[0006] Secondly, the change of steam flow is also an important factor affecting the stability of the system. As the internal pressure of the steam accumulator decreases, the released steam flow will also decrease accordingly. However, in most industrial applications, stable steam flow is the key to ensuring production efficiency and product quality. Therefore, how to effectively control the steam discharge flow of the steam accumulator is also a technical problem that needs to be solved urgently.

[0007] Therefore, in order to avoid the above adverse effects, effective flow and pressure stabilization measures need to be developed. Summary of the invention

[0008] The object of the present invention is to provide a steam accumulator heat release system and method to solve the problems existing in the above-mentioned prior art, using a pressure regulating valve group and a first steam collecting box to make the steam reach a set pressure; using a heat exchange component to make the steam reach a set temperature; using a flow regulating valve group and a second steam collecting box to make the steam reach a set flow; and finally being able to provide superheated steam with stable flow and pressure to the outside.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] The present invention provides a steam accumulator heat release system, comprising a pressure regulating valve group, a first steam collecting box, a heat exchange component, a flow regulating valve group and a second steam collecting box, wherein the pressure regulating valve group is used to regulate the steam pressure output by the steam accumulator connected thereto; the first steam collecting box is connected to the pressure regulating valve group, and the first steam collecting box is used to mix the steam output by different pressure regulating valve groups; the heat exchange component is used to heat the temperature of the steam discharged from the first steam collecting box to a set temperature; the flow regulating valve group is used to regulate the steam flow output by the heat exchange component; the second steam collecting box is connected to the flow regulating valve group, and the second steam collecting box is used to mix the steam output by different flow regulating valve groups, and the second steam collecting box is provided with a steam output port.

[0011] In one embodiment, the pressure regulating valve group includes a self-operated regulating valve and a pressure measuring device, and the pressure value measured by the pressure measuring device is used for feedback regulation of the valve opening of the self-operated regulating valve.

[0012] In one embodiment, different steam accumulators are connected via connecting valves.

[0013] In one embodiment, the heat exchange component includes a molten salt steam heat exchanger, and the molten salt steam heat exchanger includes a molten salt passage and a first steam passage, and the steam in the first steam passage is used to absorb heat from the molten salt passage.

[0014] In one embodiment, an electric heater is further included, and the electric heater is used to heat the steam in the first steam collecting box and then transmit the steam to the first steam passage.

[0015] In one embodiment, it also includes a steam regenerator, which includes a second steam passage and a third steam passage, the second steam passage is connected in parallel with the electric heater, the second steam passage and the electric heater are respectively provided with stop valves at both ends, the third steam passage is connected to the first steam passage and the flow regulating valve group, and the third steam passage is used to heat the steam in the second steam passage.

[0016] In one embodiment, the flow regulating valve group includes a first flow regulating valve group and a second flow regulating valve group, the first flow regulating valve group is connected to the first steam passage, and the second flow regulating valve group is connected to the third steam passage.

[0017] In one embodiment, the first flow regulating valve group includes a flow regulating valve and a flow measuring device, and the flow value measured by the flow measuring device is used for feedback adjustment of the valve opening of the flow regulating valve.

[0018] The present invention also provides a steam accumulator heat release method, which uses the steam accumulator heat release system as described above, and includes the following contents: opening the valve in the pressure regulating valve group to adjust the steam pressure output by the steam accumulator so that the steam pressure entering the first steam collecting box is stabilized at a set value; the steam output by the first steam collecting box is heated by a heat exchange component and then output to the flow regulating valve group; the flow regulating valve group adjusts the steam flow output by the heat exchange component, and the steam with stable pressure and flow enters the second steam collecting box; and steam with stable flow and pressure is provided to the outside through the second steam collecting box.

[0019] In one embodiment, at the beginning of steam release, the steam output from the first steam collecting box is heated by the electric heater and then enters the molten salt steam heat exchanger, and the steam at the steam side outlet of the molten salt steam heat exchanger enters the first flow regulating valve group; when the flow is stable, the steam output from the first steam collecting box no longer passes through the electric heater, but passes through the steam reheater, and enters the molten salt steam heat exchanger after heat exchange with the steam output from the molten salt steam heat exchanger in the steam reheater; a part of the steam output from the molten salt steam heat exchanger passes through the first flow regulating valve group and then enters the second steam collecting box, and the other part enters the second flow regulating valve group after heat exchange with the steam output from the first steam collecting box in the steam reheater, and then enters the second steam collecting box; the first flow regulating valve group and the second flow regulating valve group regulate the steam flow entering the second steam collecting box.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The present invention connects the steam accumulator to the pressure regulating valve group, the first steam collecting box, the heat exchange component, the flow regulating valve group and the second steam collecting box in sequence, and can use the pressure regulating valve group to adjust the steam pressure, and mix the steam of multiple steam accumulators through the first steam collecting box, so that the steam reaches the set pressure; use the heat exchange component to heat the steam after pressure regulation and before flow regulation, so that the steam reaches the set temperature; use the flow regulating valve group to adjust the steam flow, and mix the steam of multiple channels through the second steam collecting box, so that the steam reaches the set flow; and finally can provide superheated steam with stable flow and pressure to the outside. The present invention optimizes the configuration and control strategy of the steam accumulator to achieve a more stable and efficient energy storage and release process, providing strong support for the flexible operation of the power system and the efficient use of renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a steam accumulator heat release system in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of steam accumulator;

[0025] Figure 3 for Figure 1 Schematic diagram of medium pressure regulating valve group;

[0026] Figure 4 for Figure 1 Schematic diagram of heat exchange components;

[0027] Figure 5 for Figure 1 Schematic diagram of medium flow regulating valve group;

[0028] Among them, 1. steam accumulator; 2. pressure regulating valve group; 3. first steam collecting box; 4. heat exchange component; 5. flow regulating valve group; 6. second steam collecting box;

[0029] 11. First steam accumulator; 12. Second steam accumulator; 13. Connecting valve;

[0030] 21. Self-operated regulating valve; 22. Pressure measuring device; 23. Check valve;

[0031] 41. electric heater; 42. molten salt steam heat exchanger; 421. molten salt passage; 422. first steam passage; 43. steam regenerator; 431. second steam passage; 432. third steam passage;

[0032] 51. First flow regulating valve group; 511. Flow regulating valve; 512. Flow measuring device; 513. Parallel channel; 52. Second flow regulating valve group. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a steam accumulator heat release system and method to solve the problems existing in the prior art, using a pressure regulating valve group and a first steam collecting box to make the steam reach a set pressure; using a heat exchange component to make the steam reach a set temperature; using a flow regulating valve group and a second steam collecting box to make the steam reach a set flow; and finally being able to provide superheated steam with a stable flow and pressure to the outside.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 to Figure 5As shown, the present invention provides a steam accumulator heat release system, comprising a pressure regulating valve group 2, a first steam collecting box 3, a heat exchange component 4, a flow regulating valve group 5 and a second steam collecting box 6 arranged in sequence according to the steam flow path. The pressure regulating valve group 2 is used to adjust the steam pressure output by the steam accumulator 1 connected thereto. The steam accumulator 1 can be provided with one or more, and each steam accumulator 1 is correspondingly connected with a pressure regulating valve group 2, that is, the steam pressure output by each steam accumulator 1 can be independently adjusted. The first steam collecting box 3 is connected to the pressure regulating valve group 2. After the adjustment of the pressure regulating valve group 2, the steam pressure entering the first steam collecting box 3 is stabilized at a set value. The steam output by different pressure regulating valve groups 2 is mixed in the first steam collecting box 3. The first steam collecting box 3 can balance the steam pressure, reduce the impact of the pressure and flow fluctuations at the moment of valve opening and closing, and ensure the stability of the outlet steam pressure and temperature. The heat exchange component 4 is connected to the first steam collecting box 3, and the steam temperature discharged from the first steam collecting box 3 is heated to the set temperature through the heat exchange component 4. The heat exchange component 4 can adopt heat exchange methods such as electric heating and molten salt heating. The flow regulating valve group 5 is used to adjust the steam flow output by the heat exchange component 4. The heat exchange component 4 can be provided with one or more outlets. When multiple outlets are provided, each outlet is provided with a different flow regulating valve group 5. The second steam collecting tank 6 is connected to the flow regulating valve group 5. After the adjustment of the flow regulating valve group 5, the steam with stable pressure and flow enters the second steam collecting tank 6. The steam output by different flow regulating valve groups 5 is mixed in the second steam collecting tank 6. The second steam collecting tank 6 can balance the steam pressure, reduce the impact of the pressure and flow fluctuations at the moment of valve opening and closing, and ensure the stability of the outlet steam pressure and temperature. The second steam collecting tank 6 is provided with a steam output port, which can be connected to the industrial steam supply network for supplying industrial steam.

[0037] The present invention connects the steam accumulator 1 to the pressure regulating valve group 2, the first steam collecting box 3, the heat exchange component 4, the flow regulating valve group 5 and the second steam collecting box 6 in sequence, and can use the pressure regulating valve group 2 to adjust the steam pressure, and mix the steam of multiple steam accumulators 1 through the first steam collecting box 3, so that the steam reaches the set pressure; use the heat exchange component 4 to heat the steam after pressure regulation and before flow regulation, so that the steam reaches the set temperature; use the flow regulating valve group 5 to adjust the steam flow, and mix the steam of multiple channels through the second steam collecting box 6, so that the steam reaches the set flow; and finally can provide superheated steam with stable flow and pressure to the outside. The present invention optimizes the configuration and control strategy of the steam accumulator 1 to achieve a more stable and efficient energy storage and release process, providing strong support for the flexible operation of the power system and the efficient use of renewable energy.

[0038] In one embodiment, the pressure regulating valve group 2 includes a self-operated regulating valve 21 and a pressure measuring device 22. The pressure measuring device 22 can be installed at the downstream position of the self-operated regulating valve 21. The outlet pressure of the self-operated regulating valve 21 can be measured by the pressure measuring device 22. The pressure value measured by the pressure measuring device 22 is used to feedback and adjust the valve opening of the self-operated regulating valve 21, so that stable steam reaching the set pressure can be output through the pressure regulating valve group 2. A one-way valve 23 can also be provided between the self-operated regulating valve 21 and the pressure measuring device 22 to prevent steam backflow. In addition, stop valves can be provided at the front end and the rear end of the self-operated regulating valve 21.

[0039] In one embodiment, multiple groups of steam accumulators 1 are used, including a first steam accumulator 11 and a second steam accumulator 12. The first steam accumulator 11 and the second steam accumulator 12 are connected through a connecting valve 13. The connecting valve 13 can be a stop valve, which is arranged at the bottom of the first steam accumulator 11 and the second steam accumulator 12. The end close to the first steam accumulator 11 and the end close to the second steam accumulator 12 are both provided with a stop valve. After the steam accumulator 1 is filled with steam, after the steam release command is issued, the connecting valve 13 is opened first to balance the pressure between the steam accumulators 1, and then the next step is performed to make the steam release process more stable. The steam accumulator 1 can also be connected to a water supply pipe and a sewage pipe.

[0040] In one embodiment, the heat exchange assembly 4 includes a molten salt steam heat exchanger 42, which includes a molten salt passage 421 and a first steam passage 422. The molten salt passage 421 is connected to a high-temperature molten salt tank and a low-temperature molten salt tank. The molten salt flow direction of the molten salt passage 421 is opposite to the steam flow direction of the first steam passage 422. The steam in the first steam passage 422 can absorb the heat of the molten salt in the molten salt passage 421. The molten salt flows out of the high-temperature molten salt tank and enters the low-temperature molten salt tank after heat exchange (heat release), while the steam flows out of the first steam collecting box 3 and enters the flow regulating valve group 5 or the steam regenerator 43 after heat exchange (heat absorption).

[0041] In one embodiment, an electric heater 41 is further included. The electric heater 41 can heat the steam output from the first steam collecting box 3 to increase the steam temperature. The steam heated by the electric heater 41 is transported to the first steam passage 422 for further heating.

[0042] In one embodiment, a steam regenerator 43 is further included, and the steam regenerator 43 includes a second steam passage 431 and a third steam passage 432. The steam flow direction in the second steam passage 431 is opposite to the steam flow direction in the third steam passage 432. The second steam passage 431 is connected in parallel with the electric heater 41. The second steam passage 431 and the electric heater 41 are respectively provided with stop valves at both ends. By opening and closing the stop valves, the steam can be selectively passed through the second steam passage 431 and the electric heater 41. The third steam passage 432 is connected to the first steam passage 422 and the flow regulating valve group 5. The third steam passage 432 is used to heat the steam in the second steam passage 431. Therefore, the steam heated by the molten salt in the first steam passage 422 flows to the third steam passage 432 to heat the steam in the second steam passage 431. The steam in the third steam passage 432 cools down and flows to the flow regulating valve group 5. The steam in the second steam passage 431 is heated and flows to the first steam passage 422 to continue heating.

[0043] In one embodiment, the flow regulating valve group 5 includes a first flow regulating valve group 51 and a second flow regulating valve group 52. The first flow regulating valve group 51 is connected to the first steam passage 422. The outlet of the first steam passage 422 has two branches, one branch is connected to the first flow regulating valve group 51, and the other branch is connected to the third steam passage 432 through a stop valve. The second flow regulating valve group 52 is connected to the third steam passage 432. The first flow regulating valve group 51 and the second flow regulating valve group 52 respectively control the steam flow rates flowing through them, and steam of different temperatures enters the second steam collecting box 6 in proportion to be mixed, and finally obtains steam of the required temperature.

[0044] In one embodiment, the first flow regulating valve group 51 includes a flow regulating valve 511 and a flow measuring device 512. The flow measuring device 512 can be installed at the downstream position of the flow regulating valve 511. The outlet flow of the flow regulating valve 511 can be measured by the flow measuring device 512. The flow value measured by the flow measuring device 512 is used to feedback and adjust the valve opening of the flow regulating valve 511, so that steam with a set flow rate can be output through the first flow regulating valve group 51. Stop valves can be set at the front and rear ends of the flow regulating valve 511. The flow regulating valve 511 can also be connected in parallel with a parallel channel 513. The parallel channel 513 is provided with a stop valve. When the flow regulating valve 511 fails or is under maintenance, the steam can be controlled to pass through the parallel channel 513 by opening and closing each stop valve. The second flow regulating valve group 52 adopts the same composition structure as the first flow regulating valve group 51.

[0045] Combine again Figure 1 to Figure 5 As shown, the present invention also provides a steam accumulator heat release method, using the steam accumulator heat release system as described above, including the following contents:

[0046] The valve in the pressure regulating valve group 2 is opened to adjust the steam pressure output by the steam accumulator 1 so that the steam pressure entering the first steam collecting tank 3 is stabilized at the set value.

[0047] The steam output from the first steam collecting box 3 is heated by the heat exchange component 4 and then output to the flow regulating valve group 5 .

[0048] The flow regulating valve group 5 regulates the steam flow output by the heat exchange component 4 , and the steam with stable pressure and flow enters the second steam collecting box 6 .

[0049] The second steam collecting tank 6 provides steam with a stable flow rate and pressure to the outside.

[0050] In one embodiment, the heat exchange component 4 may adopt a combined heating method, specifically:

[0051] At the beginning of steam release, the steam output from the first steam collecting box 3 enters the molten salt steam heat exchanger 42 after being heated by the electric heater 41 , and the steam at the outlet of the steam side (first steam passage 422 ) of the molten salt steam heat exchanger 42 enters the first flow regulating valve group 51 .

[0052] When the flow rate is stable, the steam output from the first steam collecting box 3 no longer passes through the electric heater 41 , but passes through the steam regenerator 43 , exchanges heat with the steam output from the molten salt steam heat exchanger 42 in the steam regenerator 43 , and then enters the molten salt steam heat exchanger 42 .

[0053] A part of the steam output from the molten salt steam heat exchanger 42 enters the second steam collecting tank 6 after passing through the first flow regulating valve group 51, and the other part enters the second flow regulating valve group 52 after heat exchange with the steam output from the first steam collecting tank 3 in the steam regenerator 43, and then enters the second steam collecting tank 6. The second steam collecting tank 6 can mix the steam of different temperatures on the two pipelines, balance the steam pressure, and evenly mix the steam in the second steam collecting tank 6, and then output the steam with stable temperature and pressure to the industrial steam supply network.

[0054] The first flow regulating valve group 51 and the second flow regulating valve group 52 regulate the steam flow entering the second steam collecting tank 6. The total steam flow when the steam accumulator 1 is discharged can be regulated by the first flow regulating valve group 51 and the second flow regulating valve group 52, thereby, the steam accumulator 1 can provide steam with stable flow and pressure to the outside.

[0055] In one embodiment, the present invention provides specific embodiments as follows:

[0056] After the steam charging is completed, the steam accumulator 1 stores saturated steam and saturated water at a pressure of 6 MPa, and the saturated temperature is 275.6° C. The connecting valve 13 at the bottom of the steam accumulator 1 is opened, and the pressures between different steam accumulators 1 are balanced.

[0057] When steam release begins, the valve in the pressure regulating valve group 2 is first opened, and the pressure value measured by the pressure measuring device 22 is fed back to adjust the valve opening of the self-operated regulating valve 21, so that the pressure of the saturated steam at the outlet of the self-operated regulating valve 21 is controlled at 2.4MPa. The saturated steam at the outlet of the steam accumulator 1 is adjusted in pressure by the pressure regulating valve group 2 and then collected in the first steam collecting box 3.

[0058] At the beginning of steam release, the saturated steam at the outlet of the first steam collecting box 3 first enters the electric heater 41, then enters the molten salt steam heat exchanger 42, and then enters the first flow regulating valve group 51. In this embodiment, at the beginning of steam release, the saturated steam at the outlet of the first steam collecting box 3 is heated to 2.4MPa, 245°C superheated steam in the electric heater 41, and the superheated steam at the outlet of the electric heater 41 exchanges heat with the high-temperature molten salt in the molten salt steam heat exchanger 42, cooling the high-temperature molten salt of 500°C to 290°C, and the steam is further heated to 2.4MPa, 370°C superheated steam. The superheated steam at the outlet of the molten salt steam heat exchanger 42 enters the first flow regulating valve group 51, and the flow value measured by the flow measuring device 512 is fed back to adjust the opening of the flow regulating valve 511, so that the steam flow of the entire circuit is controlled at 150t / h. The flow regulating valve 511 and the stop valve in the flow regulating valve group 5 are both electric valves. The electric regulating valve can automatically control the valve opening according to the feedback signal, and the electric stop valve can automatically switch according to the signal. The flow value measured by the flow measuring device 512 is used to feedback and adjust the opening of the flow regulating valve 511. When the measured flow value is greater than 150t / h, the opening of the flow regulating valve 511 automatically decreases. When the measured flow value is less than 150t / h, the opening of the flow regulating valve 511 automatically increases, thereby controlling the steam flow rate at 150t / h. When releasing steam, the pressure in the steam accumulator 1 is relatively high at the moment the valve is opened, and the flow regulating valve 511 has a small opening to make the flow rate 150t / h. Then, as the pressure in the steam accumulator 1 decreases, in order to maintain a flow rate of 150t / h, the opening of the flow regulating valve 511 gradually increases.

[0059] When the pressure and flow of the steam are stable, close the electric heater 41 and the stop valves before and after it, and open the stop valve on the steam reheater 43 pipeline. At this time, the saturated steam at the outlet of the first steam collecting box 3 no longer passes through the electric heater 41, but passes through the low-temperature steam side (second steam passage 431) of the steam reheater 43 and then enters the molten salt steam heat exchanger 42 (first steam passage 422). Part of the superheated steam at the outlet of the molten salt steam heat exchanger 42 (first steam passage 422) enters the first flow regulating valve group 51, and the other part enters the high-temperature steam side (third steam passage 432) in the steam reheater 43, exchanges heat with the saturated steam at the outlet of the first steam collecting box 3 and enters the second flow regulating valve group 52. In this embodiment, after the steam discharge is stabilized, the saturated steam of 2.4MPa and 221.8℃ at the outlet of the first steam collecting box 3 is heated to 2.4MPa and 245℃ in the steam regenerator 43 (the second steam passage 431), and then enters the molten salt steam heat exchanger 42 (the first steam passage 422), where it is heated to 2.4MPa and 401℃. A part of the superheated steam at the outlet of the molten salt steam heat exchanger 42 (the first steam passage 422) enters the first flow regulating valve group 51, and the steam flow of the branch is controlled to about 120t / h by the first flow regulating valve group 51. In this process, the flow value measured by the flow measuring device 512 is fed back to adjust the opening of the flow regulating valve 511. When the measured flow value is greater than 120t / h, the opening of the flow regulating valve 511 is automatically reduced. When the measured flow value is less than 120t / h, the opening of the flow regulating valve 511 is automatically increased, thereby controlling the steam flow to 120t / h. When the target flow of the flow regulating valve 511 changes from 150t / h to 120t / h, the pipeline flow is greater than 120t / h, and the opening of the flow regulating valve 511 automatically decreases to make the flow 120t / h. Then, as the pressure in the steam accumulator 1 decreases, the opening of the flow regulating valve 511 gradually increases to maintain the flow of 120t / h. Another part of the superheated steam enters the high-temperature steam side (third steam passage 432) of the steam regenerator 43, where it exchanges heat with the saturated steam of 2.4MPa and 221.8℃ at the outlet of the first steam collecting box 3, and is cooled to 2.4MPa and 253℃, and then enters the second flow regulating valve group 52, through which the steam flow of the branch is controlled to about 30t / h. During this process, the flow value measured by the flow measuring device 512 in the second flow regulating valve group 52 (consistent with the first flow regulating valve group 51 in structure) is fed back to adjust the opening of the flow regulating valve 511. When the measured flow value is greater than 30t / h, the opening of the flow regulating valve 511 automatically decreases. When the measured flow value is less than 30t / h, the opening of the flow regulating valve 511 automatically increases, thereby controlling the steam flow at 30t / h.When the valve is opened, the pressure in the steam accumulator 1 is relatively high, and the flow regulating valve 511 has to be opened relatively small to make the flow rate 30 t / h. Then, as the pressure in the steam accumulator 1 decreases, the opening of the flow regulating valve 511 gradually increases to maintain the flow rate of 30 t / h.

[0060] The total steam flow is controlled at 150 t / h through the flow regulating valve groups 5 on the two branches. Then, the steam at the outlets of the first flow regulating valve group 51 and the second flow regulating valve group 52 are collected in the second steam collecting tank 6. In the second steam collecting tank 6, the steam of the two flow regulating valve groups 5 is fully mixed. The mixed steam is 2.4 MPa and 370°C. The mixed steam is exported from the second steam collecting tank 6 to provide superheated steam to the outside.

[0061] By adopting a steam accumulator heat release system provided with a pressure regulating valve group 2, a flow regulating valve group 5, a first steam collecting tank 3 and a second steam collecting tank 6, the steam accumulator 1 in this embodiment can continuously provide 2.4MPa, 370℃, 150t / h superheated steam to the outside for a long period of time after the start of steam release.

[0062] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A steam accumulator heat release system, characterized in that: include: A pressure regulating valve group, wherein the pressure regulating valve group is used to adjust the steam pressure output by the steam accumulator connected thereto; a first steam collecting box, the first steam collecting box being connected to the pressure regulating valve group, and the first steam collecting box being used for mixing steam outputted by different pressure regulating valve groups; A heat exchange component, the heat exchange component is used to heat the temperature of the steam discharged from the first steam collecting box to a set temperature; A flow regulating valve group, the flow regulating valve group is used to adjust the steam flow output by the heat exchange component; and a second steam collecting box, the second steam collecting box being connected to the flow regulating valve group, the second steam collecting box being used to mix the steam outputted by different flow regulating valve groups, and the second steam collecting box being provided with a steam output port; The heat exchange assembly comprises a molten salt steam heat exchanger, the molten salt steam heat exchanger comprises a molten salt passage and a first steam passage, the steam in the first steam passage is used to absorb the heat of the molten salt passage; It also includes an electric heater, which is used to heat the steam in the first steam collecting box and then transport it to the first steam passage; It also includes a steam regenerator, the steam regenerator includes a second steam passage and a third steam passage, the second steam passage is connected in parallel with the electric heater, the second steam passage and the electric heater are respectively provided with stop valves at both ends, the third steam passage is connected with the first steam passage and the flow regulating valve group, and the third steam passage is used to heat the steam in the second steam passage; The flow regulating valve group includes a first flow regulating valve group and a second flow regulating valve group, the first flow regulating valve group is connected to the first steam passage, and the second flow regulating valve group is connected to the third steam passage.

2. The steam accumulator heat release system according to claim 1, characterized in that: The pressure regulating valve group comprises a self-operated regulating valve and a pressure measuring device, and the pressure value measured by the pressure measuring device is used for feedback regulation of the valve opening of the self-operated regulating valve.

3. The steam accumulator heat release system according to claim 1, characterized in that: The different steam accumulators are connected via connecting valves.

4. The steam accumulator heat release system according to claim 1, characterized in that: The first flow regulating valve group includes a flow regulating valve and a flow measuring device, and the flow value measured by the flow measuring device is used for feedback adjustment of the valve opening of the flow regulating valve.

5. A steam accumulator heat release method, characterized in that: The steam accumulator heat release system according to any one of claims 1 to 4 includes the following contents: Open the valve in the pressure regulating valve group to adjust the steam pressure output by the steam accumulator so that the steam pressure entering the first steam collecting box is stabilized at the set value; The steam outputted from the first steam collecting box is heated by the heat exchange component and then outputted to the flow regulating valve group; The flow regulating valve group regulates the steam flow output by the heat exchange component, and the steam with stable pressure and flow enters the second steam collecting box; The second steam collecting tank provides steam with a stable flow rate and pressure to the outside.

6. The steam accumulator heat release method according to claim 5, characterized in that: At the beginning of steam release, the steam output from the first steam collecting box enters the molten salt steam heat exchanger after being heated by the electric heater, and the steam at the steam side outlet of the molten salt steam heat exchanger enters the first flow regulating valve group; When the flow rate is stable, the steam output from the first steam collecting box no longer passes through the electric heater, but passes through the steam regenerator, exchanges heat with the steam output from the molten salt steam heat exchanger in the steam regenerator, and then enters the molten salt steam heat exchanger; A part of the steam output from the molten salt steam heat exchanger enters the second steam collecting tank after passing through the first flow regulating valve group, and another part of the steam exchanges heat with the steam output from the first steam collecting tank in the steam regenerator, enters the second flow regulating valve group, and then enters the second steam collecting tank; The first flow regulating valve group and the second flow regulating valve group regulate the steam flow entering the second steam collecting box.

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