High-temperature heat storage steam supply system

Abstract

The utility model discloses a high-temperature heat storage steam supply system which comprises a steam generation device, the steam generation device comprises a heat storage tank, a heat exchange coil pipe and an electric heater, and a water inlet of the heat exchange coil pipe is connected to a water supply device through a water supply pipeline; a steam outlet of the heat exchange coil pipe is connected to steam using equipment through a steam pipeline, and a desuperheater and a pressure sensor are sequentially arranged in the steam pipeline in the flowing direction of steam. The pressure sensor is arranged behind the desuperheater and used for collecting steam pressure signals in real time and feeding the steam pressure signals back to the control system, the water feeding pump is dynamically started and stopped based on the pressure feedback signals, and real-time adjustment of the steam pressure is achieved. When the measured steam pressure is higher than the set upper limit, the water feeding pump is cut off to reduce steam generation; when the measured steam pressure is lower than the set lower limit, the water feeding pump is started to improve steam output, and the working conditions of frequent start and stop and load sudden change of steam utilization equipment are effectively adapted.

Description

Technical Field

[0001] This utility model relates to the field of thermal storage and steam supply technology, and in particular to a high-temperature thermal storage and steam supply system. Background Technology

[0002] In the industrial sector, the demand for small-scale steam supply generally relies on electric heating technology, which uses electricity to directly heat water to quickly generate steam. While electric heating offers advantages such as fast response and instant availability, its operating costs are significantly affected by peak-valley electricity price differences. High electricity prices during peak hours cause equipment operating costs to rise sharply. To balance economic efficiency and steam supply stability, the industry typically employs thermal energy storage technology to achieve a "valley electricity storage for heat, peak electricity release" off-peak steam supply model, thereby reducing overall energy costs.

[0003] Molten salt thermal energy storage and steam supply technology primarily utilizes molten salt within a storage tank for heat storage. The heat from the molten salt is then transferred to water via heat exchange coils, converting the water into steam. For example, Chinese invention patent (publication number: CN114857974A) discloses a molten salt thermal energy storage and steam supply system and method. Its core components include a storage tank, a heat exchange device, and a water supply device: the storage tank is filled with molten salt as the thermal storage medium, and the heat exchange coils are arranged in layers along the tank's axial direction. The latent heat released through the phase change of the molten salt converts the water flowing through the coils into steam, which is ultimately output from the top steam outlet. This solution can achieve the energy-saving goal of storing heat during off-peak electricity hours at night and providing continuous steam supply during the day.

[0004] However, the molten salt thermal storage steam supply system and method disclosed in the aforementioned prior art, which is equipped with a temperature measuring element at the outlet of the desuperheater to ensure stable steam output temperature, lacks a real-time pressure monitoring mechanism for its steam pipeline. This design flaw means that the system can only adapt to continuous steam supply scenarios with stable steam demand, and cannot respond to operating conditions with frequent start-stop or sudden load changes. The lack of pressure feedback makes it difficult for the system to dynamically adjust the steam supply, which can easily lead to excessive steam pressure or insufficient supply, seriously restricting the applicability and safety of the equipment.

[0005] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The purpose of this utility model is to address the deficiencies and shortcomings of the existing technology by providing a high-temperature thermal storage and steam supply system. The system is equipped with a pressure sensor in the steam pipeline to promptly detect the steam usage. The control system can automatically adjust the start and stop of the feedwater pump to meet the needs of frequent start-stop and sudden load changes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-temperature thermal storage and steam supply system includes a steam generating device comprising a thermal storage tank, a heat exchange coil, and an electric heater. The thermal storage tank contains a thermal storage medium, and the electric heater heats the medium. The thermal storage medium exchanges heat with the heat exchange coil. A water supply pipeline connects the inlet of the heat exchange coil to a water supply device, and a water pump is installed in the water supply pipeline. A steam pipeline connects the steam outlet of the heat exchange coil to a steam-consuming device, and a desuperheater and a pressure sensor are sequentially installed along the steam flow direction in the steam pipeline. A desuperheating water branch connects the desuperheater to the water supply device, and a desuperheating water pump and a desuperheating valve are sequentially installed along the water flow direction in the desuperheating water branch. A return water branch connects the inlet of the return water branch to the outlet of the desuperheating water pump, and the outlet of the return water branch connects to the inlet of the desuperheating water pump or the water supply device. A regulating water valve is installed in the return water branch.

[0009] Furthermore, a temperature sensor A is installed between the desuperheater and the steam-using equipment.

[0010] Furthermore, the outlet of the water pump is equipped with a water supply check valve A.

[0011] Furthermore, a desuperheating check valve C is provided between the desuperheater and the desuperheating valve.

[0012] Furthermore, the inlet of the heat exchange coil is also connected to a drain branch pipe, and the drain branch pipe is equipped with a drain device for controlling the opening and closing of the drain branch pipe.

[0013] Furthermore, the sewage discharge device is a manual sewage discharge valve, an automatic sewage discharge valve, or a combination of both.

[0014] Furthermore, the water supply pump includes water supply pump A and water supply pump B arranged in parallel in the water supply pipeline. The inlet of water supply pump A and the inlet of water supply pump B are connected to the water supply device. The outlet of water supply pump A is provided with a water supply check valve A, and the outlet of water supply pump B is provided with a water supply check valve B.

[0015] Furthermore, the desuperheating water pump includes a desuperheating water pump A and a desuperheating water pump B arranged in parallel in the desuperheating water branch. The inlet of the desuperheating water pump A and the inlet of the desuperheating water pump B are connected to the water supply device. The outlet of the desuperheating water pump A is provided with a desuperheating check valve A, and the outlet of the desuperheating water pump B is provided with a desuperheating check valve B.

[0016] Furthermore, the heat exchange coils are arranged in a spiral shape from top to bottom inside the heat storage tank.

[0017] Furthermore, the heat exchange coil is spirally attached to the inner or outer wall of the heat storage tank from top to bottom.

[0018] With the above structure, the beneficial effects of this utility model are as follows: The high-temperature thermal storage and steam supply system of this utility model has a pressure sensor installed after the desuperheater to collect steam pressure signals in real time and feed them back to the control system. Based on the pressure feedback signal, the feedwater pump is dynamically started and stopped to achieve real-time regulation of steam pressure. When the measured steam pressure is higher than the set upper limit, the feedwater pump is immediately shut off to reduce steam generation; when the measured steam pressure is lower than the set lower limit, the feedwater pump is started to increase steam output, effectively adapting to the frequent start-stop and sudden load changes of steam-using equipment. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is the system structure of this utility model. Figure 1 ;

[0021] Figure 2 This is the system structure of this utility model. Figure 2 ;

[0022] Figure 3 This is the system structure of this utility model. Figure 3 .

[0023] Figures 1 to 3 The winning number is:

[0024] 1. Steam generator; 11. Heat storage tank; 12. Heat exchange coil; 13. Electric heater; 2. Water supply pipeline; 21. Water supply pump; 211. Water supply pump A; 212. Water supply pump B; 213. Water supply check valve A; 214. Water supply check valve B; 3. Water supply device; 4. Steam pipeline; 41. Desuperheater; 42. Pressure sensor; 43. Temperature sensor A; 5. Steam-using equipment; 6. Desuperheating water branch; 61. Desuperheating water pump; 611. Desuperheating water pump A; 612. Desuperheating water pump B; 613. Desuperheating check valve A; 614. Desuperheating check valve B; 62. Desuperheating valve; 63. Desuperheating check valve C; 7. Return water branch; 71. Regulating water valve; 8. Sewage branch; 81. Sewage discharge device. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that if terms such as "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, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0031] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figures 1 to 3 As shown, a high-temperature thermal storage and steam supply system includes a steam generating device 1, which comprises a thermal storage tank 11, a heat exchange coil 12, and an electric heater 13. The thermal storage tank 11 contains a thermal storage medium, and the electric heater 13 heats the thermal storage medium. The thermal storage medium exchanges heat with the heat exchange coil 12. A water supply pipe 2 connects the inlet of the heat exchange coil 12 to a water supply device 3, and a water supply pump 21 is installed in the water supply pipe 2. A steam pipe 4 connects the steam outlet of the heat exchange coil 12 to... A desuperheater 41 and a pressure sensor 42 are sequentially installed in the steam pipeline 4 along the steam flow direction, connected to the steam-using equipment 5. A desuperheating water branch 6 connects the desuperheater 41 to the water supply device 3. A desuperheating water pump 61 and a desuperheating valve 62 are sequentially installed in the desuperheating water branch 6 along the water flow direction. A return water branch 7 connects the inlet of the return water pump 61 to the outlet of the return water pump 61 and the outlet of the return water branch 7 to the inlet of the return water pump 61 or the water supply device 3. A regulating water valve 71 is installed in the return water branch 7. A temperature sensor A43 is installed between the desuperheater 41 and the steam-using equipment 5.

[0033] Based on the above embodiments, the present invention aims to provide a high-temperature thermal storage and steam supply system. A pressure sensor 42 is installed after the desuperheater 41 to collect steam pressure signals in real time and feed them back to the control system. Based on the pressure feedback signal, the feedwater pump 21 is dynamically started and stopped to achieve real-time regulation of the steam pressure. The pressure regulation process is as follows: when the steam pressure measured by the pressure sensor 42 is higher than the set upper limit (e.g., 0.42 MPa), the feedwater pump 21 is shut down to reduce steam generation; when the steam pressure measured by the pressure sensor 42 is lower than the set lower limit (e.g., 0.38 MPa), the feedwater pump 21 is started to increase steam output, effectively adapting to the frequent start-stop and sudden load changes of the steam-using equipment 5.

[0034] In this embodiment, the temperature sensor A43 is connected to the control signal of the desuperheating valve 62 to measure the steam temperature at the outlet of the desuperheater 41. The opening degree of the desuperheating valve 62 is controlled based on the steam temperature measured by the temperature sensor A43, thereby controlling the amount of cold water injected into the desuperheater 41. In this embodiment, the steam supply and temperature regulation process of the high-temperature thermal storage steam supply system is as follows: When the power grid is in off-peak hours, the electric heater 13 heats the thermal storage medium in the thermal storage tank 11, raising the temperature of the thermal storage medium and storing heat in it. When the steam-using equipment 5 needs to use steam, the heat stored in the thermal storage medium is transferred to the water in the heat exchange coil 12 to generate steam. Specifically, water flows out from the water supply device 3, flows into the heat exchange coil 12 through the water pump 21 and the water check valve A213, absorbs the heat of the thermal storage medium and becomes superheated steam, which flows into the desuperheater 41. Simultaneously, another stream of water flowing from the water supply device 3 passes through the desuperheating pump 61, desuperheating valve 62, and desuperheating check valve A613 before entering the desuperheater 41. After being atomized and sprayed out, it mixes with the superheated steam, thus desuperheating the steam. By controlling the opening of the desuperheating valve 62, the steam temperature at the outlet of the desuperheater 41 reaches the set value. It is easy to understand that the larger the opening of the desuperheating valve 62, the more water enters the desuperheater 41, and the more obvious the desuperheating effect. As the temperature of the heat storage medium in the heat storage tank 11 continuously decreases, the temperature of the superheated steam also gradually decreases. At this time, the opening of the desuperheating valve 62 can be continuously reduced accordingly. In this embodiment, as... Figure 1 As shown, when the control system controls the desuperheating valve 62 to close, it controls the regulating water valve 71 in the return water branch 7 to open, so that the desuperheating water pump 61 is always in operation, and the actual operating flow rate of the desuperheating water pump 61 is always higher than its minimum continuous stable flow rate value. This satisfies the need to supply water to the desuperheater 41 in a timely manner, while also minimizing the operating power consumption of the desuperheating water pump 61.

[0035] As another preferred embodiment of this utility model, a water supply check valve A213 is provided at the outlet of the water supply pump 21, which ensures that water can only flow from the water supply pump 21 to the heat exchange coil 12. A desuperheating check valve C63 is provided between the desuperheating device 41 and the desuperheating valve 62, which ensures that water can only flow from the desuperheating valve 62 to the desuperheating device 41. In this embodiment, as... Figure 1 As shown, the high-temperature water in the heat exchange coil 12 is prevented from flowing back to the feed water pump 21 and damaging it by the feed water check valve A213. The high-temperature water vapor mixture is prevented from flowing back to the desuperheating valve 62 and damaging it by the desuperheating valve C63.

[0036] As another preferred embodiment of this utility model, the inlet of the heat exchange coil 12 is also connected to a drain branch pipe 8, and a drain device 81 for controlling the opening and closing of the drain branch pipe 8 is provided on the drain branch pipe 8. The drain device 81 is a manual drain valve, an automatic drain valve, or a combination of both. In this embodiment, as... Figure 3 As shown, by integrating the drain branch pipe 8 and the drain device 81, on-demand or periodic draining can be achieved to remove the high-concentration boiler water remaining inside the heat exchange coil 12, effectively reducing the accumulation of scale and other contaminants inside the heat exchange coil 12, keeping the heat exchange coil 12 clean, ensuring efficient heat transfer, and improving the system's thermal efficiency. Simultaneously, it reduces equipment failures caused by contaminant accumulation, extends equipment lifespan, ensures production continuity, reduces equipment maintenance costs, and improves the stability and reliability of the entire system. In this embodiment, the drain device 81 is a manual drain valve, an automatic drain valve, or a combination of both. Manual drain valves enable manual draining, while automatic drain valves enable automatic draining. Manual and automatic drain valves can also be used in combination, such as in series, where the automatic drain valve is set at the outlet of the manual drain valve. During maintenance, the manual drain valve is closed, enabling online maintenance or replacement of the automatic drain valve. Alternatively, they can be used in parallel, so that if one valve fails, the other valve can drain normally. This redundancy design improves the utilization rate of the equipment.

[0037] In another preferred embodiment of this utility model, the water supply pump 21 includes a water supply pump A211 and a water supply pump B212 arranged in parallel in the water supply pipeline 2. The inlet of water supply pump A211 and the inlet of water supply pump B212 are connected to the water supply device 3. A water supply check valve A213 is provided at the outlet of water supply pump A211, and a water supply check valve B214 is provided at the outlet of water supply pump B212. In this embodiment, as... Figure 2As shown, the configuration of water pumps A211 and B212 enables the standby function of water pump 21. When water pump A211 fails, the standby water pump B212 is activated to ensure the normal operation of the system. The water check valve B214 prevents water from flowing back into water pump B212 when water pump A211 is operating; similarly, the water check valve A213 prevents water from flowing back into water pump A211 when water pump B212 is operating.

[0038] As another preferred embodiment of this utility model, the desuperheating water pump 61 includes a desuperheating water pump A611 and a desuperheating water pump B612 arranged in parallel in the desuperheating water branch 6. The inlet of the desuperheating water pump A611 and the inlet of the desuperheating water pump B612 are connected to the water supply device 3. A desuperheating check valve A613 is provided at the outlet of the desuperheating water pump A611, and a desuperheating check valve B614 is provided at the outlet of the desuperheating water pump B612. In this embodiment, as... Figure 2 As shown, the setup of desuperheating pumps A611 and B612 enables the backup function of desuperheating pump 61. When desuperheating pump A611 fails during operation, the backup desuperheating pump B612 is activated to ensure the normal operation of the system. The desuperheating check valve A613 prevents water from flowing back into desuperheating pump A611 when desuperheating pump B612 is operating; similarly, the desuperheating check valve B614 prevents water from flowing back into desuperheating pump B612 when desuperheating pump A611 is operating.

[0039] In another preferred embodiment of this utility model, the heat exchange coil 12 is spirally arranged inside the heat storage tank 11 from top to bottom. The heat exchange coil 12 is spirally attached to the inner or outer wall of the heat storage tank 11 from top to bottom. In this embodiment, the heat exchange coil 12 is spirally arranged inside the heat storage tank 11 from top to bottom, allowing for better heat exchange between the heat exchange coil 12 and the heat storage medium, thereby heating the cold water inside 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 design allows the heat exchange coil 12 to exchange heat with the heat storage medium through the tank wall of the heat storage tank 11, and also avoids contamination of the heat storage medium due to damage to the heat exchange coil 12. It also facilitates 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.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A high-temperature heat storage steam supply system, comprising: a steam generating device (1) comprising a heat storage tank (11), a heat exchange coil (12) and an electric heater (13), the heat storage tank (11) being provided with a heat storage working medium, the electric heater (13) being used for heating the heat storage working medium, the heat storage working medium being in heat exchange cooperation with the heat exchange coil (12); a feed water pipeline (2), a water inlet of the heat exchange coil (12) being connected to a water supply device (3) through the feed water pipeline (2), the feed water pipeline (2) being provided with a feed water pump (21); a steam pipeline (4), a steam outlet of the heat exchange coil (12) being connected to a steam user (5) through the steam pipeline (4), the steam pipeline (4) being provided with a desuperheater (41) and a pressure sensor (42) in sequence along a flow direction of steam; a desuperheating water branch (6), the desuperheater (41) being connected to the water supply device (3) through the desuperheating water branch (6), the desuperheating water branch (6) being provided with a desuperheating water pump (61) and a desuperheating valve (62) in sequence along a flow direction of water; a backwater branch (7), a water inlet end of the backwater branch (7) being connected to a water outlet of the desuperheating water pump (61), a water outlet end of the backwater branch (7) being connected to a water inlet of the desuperheating water pump (61) or the water supply device (3), the backwater branch (7) being provided with an adjusting water valve (71).

2. The high temperature thermal storage steam supply system of claim 1, wherein: A temperature sensor A (43) is arranged between the desuperheater (41) and the steam user (5).

3. The high temperature thermal energy storage steam supply system of claim 1, wherein: A feed water check valve A (213) is arranged at a water outlet of the feed water pump (21).

4. The high temperature thermal energy storage and generation system of claim 1, wherein: A desuperheating check valve C (63) is arranged between the desuperheater (41) and the desuperheating valve (62).

5. The high temperature thermal energy storage and generation system of claim 1, wherein: The water inlet of the heat exchange coil (12) is further connected to a blowdown branch (8), the blowdown branch (8) being provided with a blowdown device (81) for controlling opening and closing of the blowdown branch (8).

6. The high temperature thermal energy storage steam supply system of claim 5, wherein: The blowdown device (81) is a manual blowdown valve or an automatic blowdown valve or a combination of the two.

7. The high temperature thermal energy storage and generation system of claim 1, wherein: The feed water pump (21) comprises a feed water pump A (211) and a feed water pump B (212) arranged in parallel in the feed water pipeline (2), a water inlet of the feed water pump A (211) and a water inlet of the feed water pump B (212) being connected to the water supply device (3), a water outlet of the feed water pump A (211) being provided with the feed water check valve A (213), a water outlet of the feed water pump B (212) being provided with a feed water check valve B (214).

8. The high temperature thermal energy storage and generation system of claim 1, wherein: The desuperheating water pump (61) comprises a desuperheating water pump A (611) and a desuperheating water pump B (612) arranged in parallel in the desuperheating water branch (6), a water inlet of the desuperheating water pump A (611) and a water inlet of the desuperheating water pump B (612) being connected to the water supply device (3), a water outlet of the desuperheating water pump A (611) being provided with the desuperheating check valve A (613), a water outlet of the desuperheating water pump B (612) being provided with the desuperheating check valve B (614).

9. The high temperature thermal energy storage and generation system of claim 1, wherein: The heat exchange coil (12) is arranged in a spiral shape from top to bottom in the heat storage tank (11).

10. The high temperature thermal energy storage and generation system of claim 1, wherein: The heat exchange coil (12) is arranged in a spiral shape from top to bottom and attached to an inner wall or an outer wall of the heat storage tank (11).

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