Solid heat storage heat supply system

Abstract

A solid heat storage and supply system, comprising a steam water supply part, a heat storage part and a heat release part connected in sequence; the steam water supply part is used to provide water with a given pressure to the heat storage part according to the system design requirements; the heat storage part is used to convert electric power into heat energy and store it in the heat storage material, and provide a heat source to the heat release part according to the user heat demand; the heat release part is used to provide saturated steam or superheated steam according to the user demand. The present application increases the heat absorption direct heating pipe in the heat storage device, further absorbs the heat of the heat storage material which is slowly released or cannot be fully released, and transfers it to the water to change the water from liquid to vapor-liquid mixed medium, which not only can increase the effective capacity of the heat storage device, but also improve the overall heat efficiency of the heat storage and release system.

Description

Technical Field

[0001] This invention relates to the field of solid thermal energy storage technology, and more particularly to a solid thermal energy storage and steam supply system. Background Technology

[0002] Currently, solid thermal energy storage systems are widely used in residential heating, exhibiting stable operation and high technological maturity. However, their industrial application is limited and remains largely in the demonstration phase. Among existing technologies, CN107062173A discloses a low-off-peak electric thermal energy storage boiler and its usage method, comprising: a steam drum and a thermal energy storage tank. The thermal energy storage tank contains an electric heating device for heating the thermal energy storage medium, which is connected to the power supply system. The tank also contains insulation baffles and a heat exchange device with adjustable heat exchange area. The inlet for the heat release medium of the heat exchange device is located on the thermal energy storage tank, and the outlet is located inside the steam drum. The top of the steam drum has a steam outlet and a pressure regulating valve. A return water passage connects the steam drum and the heat release medium inlet. This technical solution utilizes inexpensive off-peak electricity at night to heat the thermal energy storage medium in the tank during the thermal energy storage phase, and uses the stored heat energy to provide the required steam during the day, thus solving the peak-valley problem of the power grid. In addition, prior art CN113008064A discloses a steam thermal storage device and a steam supply system. The steam thermal storage device includes: a thermal storage system, including a steam inlet and a steam outlet; a steam supply component connected to the steam inlet for supplying steam to the thermal storage system; and a steam outlet component connected to the steam outlet. The thermal storage system is configured with a heat charging process and a heat release process to keep both the steam supply component and the steam outlet component in a pressure balance state. The steam thermal storage device utilizes the thermal storage function of water and phase change materials to store thermal energy in the form of saturated water and carry out the heat storage and heat release processes, so that the steam generation and release of the entire steam supply system can always maintain a balance.

[0003] However, in existing technologies, thermal storage and heating systems generate saturated steam or hot air. Saturated steam technology suffers from heat loss due to condensation during long-distance transport, and its low steam temperature prevents long-distance transport, thus failing to meet the needs of centralized regional heating. Therefore, overcoming the shortcomings of existing technologies has become an urgent issue to be addressed in this field. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a solid thermal storage and steam supply system. The specific technical solution adopted by the present invention is as follows.

[0005] A solid thermal storage and steam supply system, characterized in that it comprises a steam feedwater section, a thermal storage section, and a heat release section connected in sequence;

[0006] The steam feedwater section is used to supply water at a given pressure to the heat storage section according to the system design requirements;

[0007] The heat storage section is used to convert electricity into heat energy and store it in the heat storage material, and to provide a heat source to the heat release section according to the user's heat demand;

[0008] The heat release section is used to provide saturated steam or superheated steam according to user needs.

[0009] Preferably, the steam water supply section includes a water tank, a water pump, a first pressure sensor, a first temperature sensor, and a water flow meter;

[0010] The outlet of the water tank 1 is connected to the inlet of the water pump through a pipe; the first pressure sensor, the first temperature sensor, and the water flow meter are installed on the connecting pipe between the water pump and the heat storage part.

[0011] Preferably, the heat storage section includes a lower manifold, a heat absorption direct heating pipe, an upper manifold, a cold and hot temperature sensor, a hot air temperature sensor, an electric heating element, a heat storage material, and a heat storage device;

[0012] The lower manifold is connected to the outlet of the water pump via a pipe; the inlets of the plurality of heat-absorbing direct heating pipes 7 are respectively connected to the plurality of outlets of the lower manifold.

[0013] Multiple block-shaped heat storage materials are assembled to form the heat storage device, which, after assembly, can form vertical through holes for multiple heat absorption direct heating pipes to pass through and horizontal through holes for the electric heating element to pass through.

[0014] The multiple inlets of the upper manifold are respectively connected to the outlets of the multiple heat-absorbing direct heating pipes;

[0015] The cold and hot temperature sensors and the hot air temperature sensor are respectively installed at both ends of the heat storage device.

[0016] Preferably, the heat-absorbing direct-heating pipe 7 passes through the vertical through hole and is disposed in the heat storage device. The heat storage material of the heat storage device is used to release heat according to the heat user's needs, transfer the heat to the heat-absorbing direct-heating pipe and the circulating air, and support the heat-absorbing direct-heating pipe.

[0017] Preferably, the heat release section includes a second pressure sensor, a second temperature sensor, a steam drum, a third pressure sensor, a third temperature sensor, a superheat generator, a fourth temperature sensor, a fourth pressure sensor, a steam flow meter, a saturated steam switch valve, and a superheated steam switch valve.

[0018] The water inlet of the steam drum, serving as the water inlet of the heat release section, is connected to the water outlet of the upper manifold. A second pressure sensor and a second temperature sensor are installed on this pipe to detect the water pressure and temperature within the pipe. The steam outlet of the steam drum is connected via pipes to the air inlet of the superheat generator and the air inlet of the saturated steam switch valve. A third pressure sensor and a third temperature sensor are installed on this pipe to detect the pressure and temperature within the pipe. The air outlet of the superheat generator is connected to the air inlet of the superheated steam switch valve. The air outlets of both the saturated steam switch valve and the superheated steam switch valve are connected to the user's heat demand pipeline.

[0019] The heat demand user pipeline is equipped with a fourth temperature sensor, a fourth pressure sensor, and a steam flow meter, which are used to detect the temperature, pressure, and steam flow rate in the pipeline, respectively.

[0020] Preferably, the steam drum is used to separate the vapor and liquid of the vapor-liquid mixture from the upper manifold, with the liquid returning to the lower manifold for reheating, and the vapor being discharged through the steam drum outlet and transported to the superheat generator, or directly supplied to users with heat demand through the saturated steam switch valve.

[0021] Preferably, the superheat generator further heats the steam from the steam drum to generate supersaturated steam, and supplies it to users with heat demand through the superheated steam switching valve.

[0022] Beneficial effects:

[0023] This invention adds a heat-absorbing direct-heating pipe inside the heat storage device to further absorb the heat that is slowly or cannot be fully released from the heat storage material and transfer it to the water, turning the water from a liquid state into a vapor-liquid mixture. This not only increases the effective capacity of the heat storage device but also improves the overall thermal efficiency of the heat storage and release system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the solid thermal storage and steam supply system of the present invention.

[0025] Figure 2 This is a schematic diagram of the heat storage device of the present invention.

[0026] Figure 3 This is a schematic diagram of the irregular structure of the heat storage material of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention. It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application.

[0028] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] See appendix Figure 1-3 As shown, a specific embodiment of the present invention relates to a solid thermal storage and steam supply system. The solid thermal storage and steam supply system includes: a steam feedwater section, a thermal storage section, and a heat release section connected in sequence.

[0030] The steam feedwater section is used to supply water at a given pressure to the heat storage section according to the system design requirements; the heat storage section includes heat storage material, which is used to convert electricity into heat energy and store it in the heat storage material, and to provide a heat source to the heat release section according to the user's heat demand; the heat release section is used to provide saturated steam or superheated steam according to the user's demand.

[0031] The steam water supply section includes a water tank 1, a water pump 2, a first pressure sensor 3, a first temperature sensor 4, and a water flow meter 5.

[0032] The water tank 1 stores water, and the outlet of the water tank 1 is connected to the inlet of the water pump 2 via a pipe. The outlet of the water pump 2 is connected to the inlet of the heat storage section via a pipe. The water pump 2 is used to pressurize and pump the water stored in the water tank 1 to the heat storage section.

[0033] The first pressure sensor 3, the first temperature sensor 4, and the water flow meter 5 are installed on the connecting pipe between the water pump 2 and the heat storage part.

[0034] The first pressure sensor 3 is used to detect the water pressure in the pipeline. The first temperature sensor 4 is used to detect the water temperature in the pipeline. The water flow meter 5 is used to detect the water flow rate in the pipeline.

[0035] The heat storage section includes a lower manifold 6, a heat absorption direct heating pipe 7, an upper manifold 8, a circulating fan 20, a cold and hot temperature sensor 21, a hot air temperature sensor 22, an electric heating element 24, a heat storage material 25, and a heat storage device 26.

[0036] The inlet of the lower manifold 6 serves as the inlet of the heat storage section and is connected to the outlet of the water pump 2 via a pipe. The lower manifold 6 includes multiple outlets, and there are multiple heat absorption and direct heating pipes 7. The inlets of the multiple heat absorption and direct heating pipes 7 are respectively connected to the multiple outlets of the lower manifold 6. The lower manifold 6 is used to transport water to the heat absorption and direct heating pipes 7.

[0037] As attached Figure 2 As shown, multiple block-shaped heat storage materials 25 are assembled to form the heat storage device 26. (See attached diagram) Figure 3 As shown, the heat storage material 25 has an irregular shape, which, when assembled, can form a vertical through hole for the multiple heat absorption and direct heating pipes 7 to pass through, and a horizontal through hole for the electric heating element 24 to pass through.

[0038] Multiple electric heating elements 24 are disposed in the heat storage device 26 through the horizontal through holes, and are used to convert electrical energy into heat energy. The heat storage material 25 of the heat storage device 26 is used to store the heat energy.

[0039] The heat-absorbing direct heating pipes 7 are respectively installed in the heat storage device 26 through the vertical through holes. The heat storage material 25 of the heat storage device 26 is used to release heat according to the heat user's needs, transfer the heat to the heat-absorbing direct heating pipes 7 and the circulating air, and support the heat-absorbing direct heating pipes 7.

[0040] The upper manifold 8 includes multiple water inlets, and the multiple water inlets of the upper manifold 8 are respectively connected to the water outlets of the multiple heat-absorbing direct-heating tubes 7. The water outlet of the upper manifold 8 is connected to the inlet of the heat release section through a pipe. The upper manifold 8 is used to collect the vapor-liquid mixture in the heat-absorbing direct-heating tubes 7 and transport it to the heat release section.

[0041] The pipeline containing the hot air temperature sensor 22 is connected to the heat storage device 26 and the superheat generator 14. There is hot air in the pipeline. After the low temperature hot air passes through the heat storage device 26, it absorbs heat and becomes high temperature hot air, which transfers the heat to the superheat generator 14 to generate superheated steam.

[0042] The heat release section includes a second pressure sensor 9, a second temperature sensor 10, a steam drum 11, a third pressure sensor 12, a third temperature sensor 13, a superheat generator 14, a fourth temperature sensor 15, a fourth pressure sensor 16, a steam flow meter 17, a saturated steam switch valve 18, a superheated steam switch valve 19, and a cooled hot air temperature sensor 23.

[0043] The inlet of the steam drum 11 serves as the inlet of the heat release section and is connected to the outlet of the upper manifold 8 via a pipe. A second pressure sensor 9 and a second temperature sensor 10 are installed on this pipe to detect the pressure and temperature within the pipe, respectively. The outlet of the steam drum 11 is connected to the inlet of the superheat generator 14 and the inlet of the saturated steam switch valve 18 via pipes. A third pressure sensor 12 and a third temperature sensor 13 are installed on this pipe to detect the pressure and temperature within the pipe, respectively. The outlet of the superheat generator 14 is connected to the inlet of the superheated steam switch valve 19. The outlets of both the saturated steam switch valve 18 and the superheated steam switch valve 19 are connected to the user's heat demand pipeline.

[0044] The steam drum 11 is used to separate the steam and liquid from the steam-liquid mixture from the upper manifold 8. The liquid returns to the lower manifold for reheating, and the steam is discharged through the outlet of the steam drum 11 and transported to the superheat generator 14, or directly supplied to users with heat demand through the saturated steam switch valve 18.

[0045] The superheat generator 14 further heats the steam from the steam drum 11 to generate supersaturated steam, which is then supplied to users with heat demand through the superheated steam switching valve 19.

[0046] The heat demand user pipeline is equipped with a fourth temperature sensor 15, a fourth pressure sensor 16, and a steam flow meter 17, which are used to detect the temperature, pressure, and steam flow in the pipeline, respectively.

[0047] The pipes containing the hot and cold temperature sensors 21 and the hot air temperature sensor 22 are connected to the heat storage device 26 and the superheat generator 14. In the hot air pipe, the high-temperature hot air transfers heat to the superheat generator 14, becomes cold and hot air, and returns to the heat storage device 26 to absorb heat, becoming high-temperature hot air again, and then enters the hot air process again.

[0048] Figure 2 This is a schematic diagram of the heat storage device of the present invention. The structure is equipped with heat-absorbing direct heating pipes, while retaining the original hot air heat exchange channel. The heat-absorbing direct heating pipes absorb the heat that cannot be carried away in the original hot air heat exchange process, thus widening the low-temperature range during the heat release process of the heat storage device and improving the effective utilization rate of the device.

[0049] Figure 3 This is a schematic diagram of the irregular structure of the heat storage material of the present invention. This structure is used to support the electric heating element, the heat absorption direct heating pipe and to ensure the original hot air heat exchange channel. It is a key component of the heat storage device 26.

[0050] This invention employs an irregularly shaped thermal storage material structure, which, while maintaining the original hot air heat exchange performance, adds a direct-heat absorption tube support function. The addition of the direct-heat absorption tube not only widens the low-temperature range of the thermal storage device, thereby generating saturated steam, and subsequently superheated steam, filling the gap in the original solid thermal storage device's ability to generate superheated steam.

[0051] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solid thermal storage and steam supply system, characterized in that, It includes a steam feedwater section, a heat storage section, and a heat release section connected in sequence; The steam feedwater section is used to supply water at a given pressure to the heat storage section according to the system design requirements; The heat storage section is used to convert electricity into heat energy and store it in the heat storage material, and to provide a heat source to the heat release section according to the user's heat demand; The heat release section is used to provide saturated steam or superheated steam according to user needs; the steam water supply section includes a water tank, a water pump, a first pressure sensor, a first temperature sensor, and a water flow meter; The outlet of the water tank (1) is connected to the inlet of the water pump through a pipe; the first pressure sensor, the first temperature sensor, and the water flow meter are installed on the connecting pipe between the water pump and the heat storage part; the heat storage part includes a lower manifold, a heat absorption direct heating pipe, an upper manifold, a cold and hot temperature sensor, a hot air temperature sensor, an electric heating element, a heat storage material, and a heat storage device. The lower manifold is connected to the outlet of the water pump via a pipe; the inlets of the multiple heat-absorbing direct heating pipes (7) are respectively connected to the multiple outlets of the lower manifold. Multiple block-shaped heat storage materials are assembled to form the heat storage device, which, after assembly, can form vertical through holes for multiple heat absorption direct heating pipes to pass through and horizontal through holes for the electric heating element to pass through. The multiple inlets of the upper manifold are respectively connected to the outlets of the multiple heat-absorbing direct heating pipes; The cold and hot temperature sensors and the hot air temperature sensor are respectively installed at both ends of the heat storage device; the heat absorption direct heating pipe passes through the vertical through hole and is installed in the heat storage device; the heat storage material of the heat storage device is used to release heat according to the heat user's needs, transfer the heat to the heat absorption direct heating pipe and the circulating air, and support the heat absorption direct heating pipe; the heat release part includes a second pressure sensor, a second temperature sensor, a steam drum, a third pressure sensor, a third temperature sensor, a superheat generator, a fourth temperature sensor, a fourth pressure sensor, a steam flow meter, a saturated steam switch valve, and a superheated steam switch valve; The water inlet of the steam drum, serving as the water inlet of the heat release section, is connected to the water outlet of the upper manifold. A second pressure sensor and a second temperature sensor are installed on this pipe to detect the water pressure and temperature within the pipe. The steam outlet of the steam drum is connected via pipes to the air inlet of the superheat generator and the air inlet of the saturated steam switch valve. A third pressure sensor and a third temperature sensor are installed on this pipe to detect the pressure and temperature within the pipe. The air outlet of the superheat generator is connected to the air inlet of the superheated steam switch valve. The air outlets of both the saturated steam switch valve and the superheated steam switch valve are connected to the user's heat demand pipeline. The heat demand user pipeline is equipped with a fourth temperature sensor, a fourth pressure sensor, and a steam flow meter, which are used to detect the temperature, pressure, and steam flow rate in the pipeline, respectively. The steam drum is used to separate the vapor and liquid from the vapor-liquid mixture from the upper manifold. The liquid returns to the lower manifold for reheating, and the vapor is discharged through the steam drum outlet and delivered to the superheat generator, or directly supplied to the heat demand user through the saturated steam switch valve. The superheat generator further heats the steam from the steam drum to generate supersaturated steam, which is then supplied to the heat demand user through the superheated steam switch valve.

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