Heat storage steam supply system and steam supply method

Abstract

The heat storage and steam supply system comprises a steam generation device, the steam generation device comprises a heat storage tank and a heat exchange coil pipe, a water inlet of the heat exchange coil pipe is connected to a water supply device through a water supply pipeline, and a steam outlet of the heat exchange coil pipe is connected to steam utilization equipment through a steam pipeline; a desuperheater, a temperature sensor A and a pressure sensor A are sequentially arranged in the steam pipeline in the flowing direction of steam. And a water outlet of the water feeding pump is connected to the desuperheater through a desuperheating water branch. The system is simple and reasonable in structure, can be flexibly adjusted in real time according to the actual use condition of the steam equipment, is rigorous and perfect in control logic, ensures that the system outputs steam with stable temperature and pressure, and can effectively adapt to the frequent start and stop and load sudden change working conditions of the steam equipment. And the water feeding pump in the system supplies water to the heat exchange coil pipe and the desuperheater at the same time, the situation that a desuperheating water pump is independently arranged for the desuperheater is avoided, the complexity and power consumption of the system are reduced, and cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat storage for steam supply, and particularly to a heat storage steam supply system and a steam supply method. Background Art

[0002] In the industrial field, the demand for small-scale steam supply generally relies on electric heating technology, that is, directly heating water by electric energy to quickly generate steam. Although the electric heating method has the advantages of fast response speed and being ready to use immediately, its operating cost is significantly affected by the difference between peak and valley electricity prices. The high electricity price during the peak electricity period in the daytime leads to a sharp increase in the operating cost of the equipment. To balance economy and steam supply stability, the industry usually adopts heat storage technology to achieve a peak-shifting steam supply mode of "storing heat during valley electricity and releasing energy during peak electricity", so as to reduce the overall energy consumption cost.

[0003] The molten salt heat storage steam supply technology mainly stores heat through the molten salt in the storage tank, and transfers the heat of the molten salt to water through the heat exchange coil, and then converts the water into steam. For example, a molten salt heat storage steam supply system and a steam supply method disclosed in a Chinese patent application for invention (publication number: CN114857974A), or a molten salt stratified energy storage system capable of supplying steam at a constant temperature disclosed in a Chinese patent application for invention (publication number: CN112284169A). However, most of the structures of the existing molten salt heat storage systems in the prior art are relatively complex, and the system operation stability is not high.

[0004] Therefore, it is necessary to improve the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat storage steam supply system and a steam supply method for the defects and deficiencies of the prior art, which have a simple and reasonable structure, can be flexibly controlled according to the actual use conditions of the steam-consuming equipment, ensure the output of steam with stable temperature and pressure, and have high system operation stability.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A heat storage steam supply system includes a steam generating device. The steam generating device includes a heat storage tank and a heat exchange coil. A heat storage working medium is arranged in the heat storage tank, and the heat storage working medium is in heat exchange cooperation with the heat exchange coil; a feed water pipe, the water inlet of the heat exchange coil is connected to a water supply device through the feed water pipe, and a feed water pump and a feed water valve are arranged in sequence along the water flow direction in the feed water pipe; a steam pipe, the steam outlet of the heat exchange coil is connected to a steam using device through the steam pipe, and a desuperheater, a temperature sensor A and a pressure sensor A are arranged in sequence along the steam flow direction in the steam pipe; a desuperheating water branch, the water outlet of the feed water pump is connected to the desuperheater through the desuperheating water branch, and a desuperheating valve is arranged in the desuperheating water branch; a return water branch, the return water branch is connected in parallel to the feed water pipe, and the water inlet end of the return water branch is connected to the water outlet of the feed water valve, the water outlet end of the return water branch is connected to the water inlet of the feed water pump or the water supply device, and a regulating water valve is arranged in the return water branch; the temperature sensor A is connected to the desuperheating valve through a control signal, and the pressure sensor A is connected to the regulating water valve through a control signal.

[0007] Further, a pressure sensor B is arranged in the desuperheating water branch, and the pressure sensor B is connected to the feed water valve through a control signal.

[0008] Further, a feed water check valve C is arranged at the water outlet of the feed water valve.

[0009] Further, a desuperheating check valve is arranged between the desuperheater and the desuperheating valve.

[0010] Further, a blowdown branch pipe is also connected to the water inlet of the heat exchange coil, and a blowdown device for controlling the opening and closing of the blowdown branch pipe is arranged on the blowdown branch pipe.

[0011] Further, the feed water pump includes a feed water pump A and a feed water pump B arranged in parallel in the feed water pipe. The water inlets of the feed water pump A and the feed water pump B are connected to the water supply device. A feed water check valve A is arranged at the water outlet of the feed water pump A, and a feed water check valve B is arranged at the water outlet of the feed water pump B.

[0012] Further, the heat storage working medium is a phase change heat storage working medium.

[0013] Further, the heat storage working medium is molten salt or heat transfer oil or solid heat storage material.

[0014] A steam supply method of a heat storage steam supply system. The steam supply method is applied to the heat storage steam supply system. The temperature regulation process of the steam supply method is as follows: if the steam temperature measured by the temperature sensor A is lower than the set temperature value n, the desuperheating valve is closed; if the steam temperature measured by the temperature sensor A is higher than the set temperature value N, the desuperheating valve is opened, and the system adjusts the cold water amount supplied by the feed water pump to the desuperheater by controlling the opening of the desuperheating valve, so that the steam temperature is stabilized within the set range; The pressure regulation process of the steam supply method is as follows: if the steam pressure measured by the pressure sensor A is lower than the set value m, the opening degree of the regulating water valve is reduced; if the steam pressure measured by the pressure sensor A exceeds the set value M, the opening degree of the regulating water valve is increased, thereby controlling the amount of water entering the heat exchange coil to keep the steam pressure stable within the set range.

[0015] Further, a pressure sensor B is provided on the desuperheating water branch to control the opening degree of the water supply valve according to the water pressure measured by the pressure sensor B; if the water pressure measured by the pressure sensor B exceeds the set value H, the opening degree of the water supply valve is increased, and if the water pressure measured by the pressure sensor B is lower than the set value h, the opening degree of the water supply valve is reduced, so as to keep the water pressure of the desuperheating water branch stable within the set range.

[0016] After adopting the above structure, the beneficial effects of the present invention are as follows: (1) The heat storage steam supply system and steam supply method described in the present invention have a simple and reasonable structure, can be adjusted in real time and flexibly according to the actual use conditions of the steam using equipment, with a rigorous and perfect control logic, ensuring that the steam output by the system has stable temperature and pressure, can effectively adapt to the frequent start-stop and load mutation conditions of the steam using equipment, and has high system operation stability. Moreover, the feed water pump in the system supplies water to both the heat exchange coil and the desuperheater at the same time, avoiding setting a desuperheating water pump separately for the desuperheater, reducing the complexity and power consumption of the system, and saving costs.

[0017] (2) The heat storage steam supply system described in the present invention is integrated with a blowdown branch pipe and a blowdown device. The blowdown device can be a manual blowdown valve, an automatic blowdown valve, or a combination of both. Through the blowdown device, the residual high-concentration boiler water in the heat exchange coil can be emptied regularly or as needed automatically / manually, effectively reducing the accumulation of scale and other pollutants in the heat exchange coil, keeping the heat exchange coil clean to ensure efficient heat transfer, improving the thermal efficiency of the overall system; at the same time, reducing equipment failures caused by pollutant accumulation, extending the service life of the equipment, ensuring the continuity of production, reducing the equipment maintenance cost, and improving the operation stability and reliability of the entire system. Description of the Drawings

[0018] In order to more clearly illustrate the specific implementation manners of the present invention, the drawings required for use in the description of the specific implementation manners will be briefly introduced below. Obviously, the drawings in the following description are some implementation manners of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the system structure of the present invention Figure 1 ; Figure 2 is the system structure of the present invention Figure 2; Figure 3 is the system structure of the present invention Figure 3 .

[0020] Figures 1 to 3 The reference numerals in the figure are: 1. Steam generating device; 11. Heat storage tank; 12. Heat exchange coil; 13. Electric heater; 2. Feed water pipe; 21. Feed water pump; 211. Feed water pump A; 212. Feed water pump B; 213. Feed water check valve A; 214. Feed water check valve B; 22. Feed water valve; 23. Feed water check valve C; 3. Water supply device; 4. Steam pipe; 41. Desuperheater; 42. Temperature sensor A; 43. Pressure sensor A; 5. Steam-using equipment; 6. Desuperheating water branch; 61. Desuperheating valve; 62. Pressure sensor B; 63. Desuperheating check valve; 7. Return water branch; 71. Regulating water valve; 8. Blowdown branch pipe; 81. Blowdown device. Specific embodiments

[0021] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] In addition, if these terms "first" and "second" appear, these terms are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, if the term "plurality" appears, the meaning of the term "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise clearly specified or limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified or limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present invention are only for the purpose of illustration and do not represent the only implementation.

[0027] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] Such as Figures 1 to 3As shown in the figure, a heat storage steam supply system includes a steam generating device 1, which includes a heat storage tank 11 and a heat exchange coil 12. A heat storage working medium is provided in the heat storage tank 11, and the heat storage working medium is in heat exchange cooperation with the heat exchange coil 12; a feed water pipe 2, the water inlet of the heat exchange coil 12 is connected to a water supply device 3 through the feed water pipe 2, and a feed water pump 21 and a feed water valve 22 are sequentially arranged in the feed water pipe 2 along the water flow direction; a steam pipe 4, the steam outlet of the heat exchange coil 12 is connected to a steam-using device 5 through the steam pipe 4, and a desuperheater 41, a temperature sensor A 42 and a pressure sensor A 43 are sequentially arranged in the steam pipe 4 along the steam flow direction; a desuperheating water branch 6, the water outlet of the feed water pump 21 is connected to the desuperheater 41 through the desuperheating water branch 6, and a desuperheating valve 61 is arranged in the desuperheating water branch 6; a return water branch 7, the return water branch 7 is connected in parallel to the feed water pipe 2, and the water inlet end of the return water branch 7 is connected to the water outlet of the feed water valve 22, the water outlet end of the return water branch 7 is connected to the water inlet of the feed water pump 21 or the water supply device 3, and a regulating water valve 71 is arranged in the return water branch 7; the temperature sensor A 42 is connected to the desuperheating valve 61 by a control signal, and the pressure sensor A 43 is connected to the regulating water valve 71 by a control signal. The temperature sensor A 42 controls the opening degree of the desuperheating valve 61 in real time according to the measured steam temperature; the temperature and pressure sensor A 43 controls the opening degree of the regulating water valve 71 in real time according to the measured steam pressure.

[0029] Based on the above embodiments, the present invention aims to provide a heat storage steam supply system with a simple and reasonable structure, which can be adjusted in real time and flexibly according to the actual usage conditions of the steam-using device 5, ensure that the steam output by the system has stable temperature and pressure, can effectively adapt to the frequent start-stop and load mutation conditions of the steam-using device 5, and has high system operation stability. And the feed water pump 21 in the system supplies water to both the heat exchange coil 12 and the desuperheater 41 at the same time, avoiding setting a desuperheating water pump for the desuperheater 41 alone, reducing the complexity and power consumption of the system, and saving costs.

[0030] In this embodiment, the heat exchange coil 12 is arranged in a spiral shape from top to bottom in the heat storage tank 11, so that the heat exchange coil 12 can better exchange heat with the heat storage working medium to heat the water in the heat exchange coil 12 into hot steam. In a further preferred embodiment, the heat exchange coil 12 is spirally attached to the inner wall of the heat storage tank 11 from top to bottom. In other preferred embodiments, the heat exchange coil 12 is spirally attached to the outer wall of the heat storage tank 11 from top to bottom. This structural setting enables the heat exchange coil 12 to exchange heat with the heat storage working medium through the tank wall of the heat storage tank 11, can also prevent the heat storage working medium from being polluted due to the damage of the heat exchange coil 12, and is also convenient for the maintenance and replacement of the heat exchange coil 12. In this embodiment, the water flow direction in the heat exchange coil 12 is always from bottom to top, the same as the steam flow direction.

[0031] In this embodiment, the detection elements installed on the steam pipeline 4 can be a separately provided temperature sensor A42 and a pressure sensor A43, or a detection element integrating temperature detection and pressure detection.

[0032] In this embodiment, the water inlet end of the return water branch 7 is connected to the water outlet of the water supply valve 22. This structural design simplifies the control logic of the system. The water supply valve 22 is always in the open state. When it is necessary to adjust the water flow rate into the heat exchange coil 12, only the regulating water valve 71 needs to be adjusted, and there is no need to adjust the water supply valve 22. Specifically, when the opening degree of the regulating water valve 71 is increased, the water pressure of the return water branch 7 is lower than the water pressure inside the heat exchange coil 12, and most of the water will flow back from the return water branch 7 to the water inlet of the water supply pump 21 or the water supply device 3.

[0033] As another preferred solution of the present invention, a pressure sensor B62 is provided on the desuperheating water branch 6, and the pressure sensor B62 is connected to the control signal of the water supply valve 22. The pressure sensor B62 is used to detect the pressure of the desuperheating water branch 6 to control the opening degree of the water supply valve 22. In this embodiment, as Figure 1 shown, a pressure sensor B62 is provided on the desuperheating water branch 6 to collect the pressure signal of the desuperheating water branch 6 in real time and feedback it to the system, and the opening degree of the water supply valve 22 is adjusted based on the pressure feedback signal to realize the real-time adjustment of the water pressure of the desuperheating water branch 6. When the water pressure measured by the pressure sensor B62 is higher than the set upper limit, the system controls the opening degree of the water supply valve 22 to increase to reduce the amount of water flowing into the desuperheating water branch 6; when the water pressure measured by the pressure sensor B62 is lower than the set lower limit, the system controls the opening degree of the water supply valve 22 to decrease to increase the amount of water flowing into the desuperheating water branch 6, so that the water pressure of the desuperheating water branch 6 is stabilized within the set range.

[0034] As another preferred solution of the present invention, a water supply check valve C23 is provided at the water outlet of the water supply valve 22, and the water supply check valve C23 enables water to flow only from the water supply valve 22 to the heat exchange coil 12. A desuperheating check valve 63 is provided between the desuperheater 41 and the desuperheating valve 61, and the desuperheating check valve 63 enables water to flow only from the desuperheating valve 61 to the desuperheater 41. In this embodiment, as Figure 1 shown, through the setting of the water supply check valve A213, the high-temperature water in the heat exchange coil 12 is prevented from flowing back to the water supply valve 22 and damaging the water supply valve 22. Through the setting of the desuperheating check valve 63, the high-temperature water vapor mixture is prevented from flowing back to the desuperheating valve 61 and damaging the desuperheating valve 61.

[0035] As another preferred embodiment of the present invention, a blowdown branch pipe 8 is further connected to the water inlet of the heat exchange coil 12, and a blowdown device 81 for controlling the opening and closing of the blowdown branch pipe 8 is provided on the blowdown branch pipe 8. The blowdown device 81 is a manual blowdown valve or an automatic blowdown valve or a combination of both. In this embodiment, as Figure 2 shown, by providing the blowdown branch pipe 8 and the blowdown device 81, the high-concentration boiler water remaining in the heat exchange coil 12 can be emptied regularly or as needed automatically / manually, effectively reducing the accumulation of pollutants such as scale in the heat exchange coil 12, keeping the heat exchange coil 12 clean, ensuring efficient heat transfer, and improving the overall thermal efficiency of the system; at the same time, it reduces equipment failures caused by pollutant accumulation, extends the service life of the equipment, ensures the continuity of production, reduces the maintenance cost of the equipment, and improves the operation stability and reliability of the entire system. The blowdown device 81 can be a manual blowdown valve, an automatic blowdown valve, or a combination of both. Specifically, for example, when the temperature sensor B (not shown in the figure) in the heat storage tank 11 detects that the temperature of the heat storage working medium is lower than the set value, the water supply of the water supply pump 21 is stopped. The blowdown device 81 is opened automatically / manually to discharge the high-concentration boiler water remaining inside the heat exchange coil 12, and after the water inside the heat exchange coil 12 is completely emptied, the blowdown device 81 is closed automatically / manually.

[0036] In a further preferred embodiment, a temperature sensor B (not shown in the figure) is provided inside the heat storage tank 11, and the detection end of the temperature sensor B extends into the heat storage working medium, and the temperature sensor B is signal-connected to the system. The temperature sensor B is used to detect the temperature of the heat storage working medium in the heat storage tank 11 and feedback the detected temperature data to the system, and the system issues corresponding control commands according to the temperature data. Specifically, during the valley electricity period, the heat storage working medium in the heat storage tank 11 is heated. When the temperature sensor B in the heat storage tank 11 detects that the temperature of the heat storage working medium reaches the set value, the system controls the electric heater 13 to stop heating; during the peak electricity period, the water supply pump 21 continuously injects water into the water supply pipeline 2. When the water flow passes through the heat exchange coil 12, it absorbs the heat of the heat storage working medium and vaporizes to form steam, and then the steam is discharged through the steam outlet. When the temperature sensor B in the heat storage tank 11 detects that the temperature of the heat storage working medium is lower than the set value (for example, 200 °C), or when other blowdown situations occur, the water supply of the water supply pump 21 is stopped; the blowdown device 81 is opened to discharge the high-concentration boiler water remaining inside the heat exchange coil 12, and after the water inside the heat exchange coil 12 is completely emptied, the blowdown device 81 is closed.

[0037] As another preferred embodiment of the present invention, the feed water pump 21 includes a feed water pump A211 and a feed water pump B212 arranged in parallel in the feed water pipeline 2. The water inlet of the feed water pump A211 and the water inlet of the feed water pump B212 are connected to the water supply device 3. A feed water check valve A213 is provided at the water outlet of the feed water pump A211, and a feed water check valve B214 is provided at the water outlet of the feed water pump B212. In this embodiment, as Figure 3 shown, through the arrangement of the feed water pump A211 and the feed water pump B212, the function of "one in use and one standby" of the feed water pump 21 is realized. For example, when the working feed water pump A211 fails, the standby feed water pump B212 is enabled to ensure the normal operation of the system. Through the arrangement of the feed water check valve B214, the backflow of water into the feed water pump B212 when the feed water pump A211 is working is avoided. Similarly, through the arrangement of the feed water check valve A213, the backflow of water into the feed water pump A211 when the feed water pump B212 is working is avoided.

[0038] As another preferred embodiment of the present invention, the heat storage working medium is a phase change heat storage working medium. An electric heater 13 for heating the heat storage working medium is provided in the heat storage tank 11. The electric heater 13 is an electric heating rod, and a plurality of electric heating rods are evenly arranged in the heat storage tank 11 to uniformly heat the phase change heat storage working medium. In other preferred embodiments, the heat storage working medium may also be molten salt or heat transfer oil or solid heat storage material.

[0039] See Figures 1 to 3, the present invention also provides a steam supply method for a heat storage steam supply system. The steam supply method is applied to the heat storage steam supply system. During the valley electricity period: the electric heater 13 is started to heat the heat storage working medium in the heat storage tank 11. When the temperature of the heat storage working medium in the heat storage tank 11 reaches the set value (for example, 400 °C), the system controls the electric heater 13 to stop heating; during the peak electricity period: the feed water pump 21 continuously injects water into the feed water pipe 2. When the water flow passes through the heat exchange coil 12, it absorbs the heat of the heat storage working medium and vaporizes to form steam. Subsequently, the steam is transported to the steam-using equipment 5 through the steam pipe 4. The temperature adjustment process of the steam supply method is as follows: if the steam temperature measured by the temperature sensor A42 is lower than the set temperature value n (for example, 152 °C), the desuperheating valve 61 is closed; if the steam temperature measured by the temperature sensor A42 is higher than the set temperature value N (for example, 168 °C), the desuperheating valve 61 is opened. The system adjusts the cold water volume supplied by the feed water pump 21 to the desuperheater 41 by controlling the opening degree of the desuperheating valve 61, so that the steam temperature is stabilized within the set range (for example, 160 °C ± 8 °C); the pressure adjustment process of the steam supply method is as follows: if the steam pressure measured by the pressure sensor A43 is lower than the set value m (for example, 0.38 Pa), the opening degree of the regulating water valve 71 is reduced; if the steam pressure measured by the pressure sensor A43 exceeds the set value M (for example, 0.42 Pa), the opening degree of the regulating water valve 71 is increased, and then the water volume entering the heat exchange coil 12 is controlled, so that the steam pressure is stabilized within the set range (for example, 0.4 MPa ± 0.02 MPa) to meet the fluctuations in the steam demand of the steam-using equipment 5.

[0040] The steam supply method for a heat storage steam supply system provided by the present invention has a simple and reasonable structure, can be adjusted in real time and flexibly according to the actual use conditions of the steam-using equipment 5, has a rigorous and perfect control logic, ensures that the system outputs steam with stable temperature and pressure, can effectively adapt to the frequent start-stop and load mutation conditions of the steam-using equipment 5, and has high system operation stability. And the feed water pump 21 in the system supplies water to both the heat exchange coil 12 and the desuperheater 41 at the same time, avoiding setting a desuperheating water pump for the desuperheater 41 alone, reducing the complexity and power consumption of the system, and saving costs.

[0041] As another preferred solution of the present invention, a pressure sensor B62 is provided on the desuperheating water branch 6, and the opening degree of the feed water valve 22 is controlled according to the water pressure measured by the pressure sensor B62; if the water pressure measured by the pressure sensor B62 exceeds the set value H (for example, 1.05 MPa), the opening degree of the feed water valve 22 is increased; if the water pressure measured by the pressure sensor B62 is lower than the set value h (for example, 0.95 MPa), the opening degree of the feed water valve 22 is reduced, so that the water pressure of the desuperheating water branch 6 is stabilized within the set range (for example, 1.0 MPa ± 0.05 MPa).

[0042] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A heat storage and steam supply system, characterized in that, Comprising: A steam generating device (1), the steam generating device (1) includes a heat storage tank (11) and a heat exchange coil (12). A heat storage working medium is provided in the heat storage tank (11), and the heat storage working medium is in heat exchange cooperation with the heat exchange coil (12); A feed water pipe (2), the water inlet of the heat exchange coil (12) is connected to a water supply device (3) through the feed water pipe (2), and a feed water pump (21) and a feed water valve (22) are sequentially arranged in the feed water pipe (2) along the water flow direction; A steam pipe (4), the steam outlet of the heat exchange coil (12) is connected to a steam-using device (5) through the steam pipe (4), and a desuperheater (41), a temperature sensor A (42) and a pressure sensor A (43) are sequentially arranged in the steam pipe (4) along the steam flow direction; A desuperheating water branch (6), the water outlet of the feed water pump (21) is connected to the desuperheater (41) through the desuperheating water branch (6), and a desuperheating valve (61) is arranged in the desuperheating water branch (6); A return water branch (7), the return water branch (7) is connected in parallel to the feed water pipe (2), and the water inlet end of the return water branch (7) is connected to the water outlet of the feed water valve (22), the water outlet end of the return water branch (7) is connected to the water inlet of the feed water pump (21) or the water supply device (3), and a regulating water valve (71) is arranged in the return water branch (7); The temperature sensor A (42) is connected to the desuperheating valve (61) by a control signal, and the pressure sensor A (43) is connected to the regulating water valve (71) by a control signal.

2. The heat storage and steam supply system according to claim 1, wherein: The desuperheating water branch (6) is provided with a pressure sensor B (62), and the pressure sensor B (62) is connected to the feed water valve (22) by a control signal.

3. The heat storage and steam supply system according to claim 1, characterized in that: A feed water check valve C (23) is arranged at the water outlet of the feed water valve (22).

4. A heat storage and steam supply system according to claim 1, characterized in that: A desuperheating check valve (63) is arranged between the desuperheater (41) and the desuperheating valve (61).

5. A heat storage and steam supply system according to claim 1, characterized in that: The water inlet of the heat exchange coil (12) is further connected to a blowdown branch pipe (8), and a blowdown device (81) for controlling the opening and closing of the blowdown branch pipe (8) is arranged on the blowdown branch pipe (8).

6. The heat storage and steam supply system according to claim 1, wherein: The feed water pump (21) includes a feed water pump A (211) and a feed water pump B (212) arranged in parallel in the feed water pipe (2). The water inlet of the feed water pump A (211) and the water inlet of the feed water pump B (212) are connected to the water supply device (3), a feed water check valve A (213) is arranged at the water outlet of the feed water pump A (211), and a feed water check valve B (214) is arranged at the water outlet of the feed water pump B (212).

7. A heat storage and steam supply system according to claim 1, characterized in that: The heat storage working medium is a phase change heat storage working medium.

8. A heat storage and steam supply system according to claim 1, characterized in that: The heat storage working medium is molten salt or heat transfer oil or solid heat storage material.

9. A method for supplying steam in a heat storage and steam supply system, characterized in that, The steam supply method is applied to the heat storage steam supply system as described in claim 1; The temperature regulation process of the steam supply method is: if the steam temperature measured by the temperature sensor A (42) is lower than the set temperature value n, the desuperheating valve (61) is closed; if the steam temperature measured by the temperature sensor A (42) is higher than the set temperature value N, the desuperheating valve (61) is opened, and the system controls the opening degree of the desuperheating valve (61) to adjust the amount of cold water supplied by the feed water pump (21) to the desuperheater (41), so that the steam temperature is stabilized within the set range; The pressure regulation process of the steam supply method is as follows: If the steam pressure measured by the pressure sensor A (43) is lower than the set value m, the opening degree of the regulating water valve (71) is reduced; if the steam pressure measured by the pressure sensor A (43) exceeds the set value M, the opening degree of the regulating water valve (71) is increased, thereby controlling the water volume entering the heat exchange coil (12) to make the steam pressure stable within the set range.

10. The steam supply method of a heat storage steam supply system according to claim 9, characterized in that: The desuperheating water branch (6) is provided with a pressure sensor B (62), and the opening degree of the water supply valve (22) is controlled according to the water pressure measured by the pressure sensor B (62); if the water pressure measured by the pressure sensor B (62) exceeds the set value H, the opening degree of the water supply valve (22) is increased, and if the water pressure measured by the pressure sensor B (62) is lower than the set value h, the opening degree of the water supply valve (22) is reduced, so as to make the water pressure of the desuperheating water branch (6) stable within the set range.

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