Heat reservoir and heat storage and release system

Abstract

The invention relates to a heat reservoir and a heat storage and release system. The heat reservoir comprises a heat storage unit; the heat exchange pipe at least partially penetrates through the heat storage unit, so that a first heat exchange medium flowing through the heat exchange pipe can absorb heat of the heat storage unit, and a second heat exchange medium flowing through the heat exchange pipe can release heat to the heat storage unit; the first connector pipe is used for providing a first heat exchange medium or a second heat exchange medium for the heat exchange pipe; and the second connector pipe is used for discharging the first heat exchange medium or the second heat exchange medium from the heat exchange pipe after heat exchange. By means of the technical scheme, the heat exchange medium can enter the heat exchange pipe from the first connector pipe, conduct heat exchange with the heat storage unit in the heat exchange pipe and then leave the heat exchange pipe from the second connector pipe, in the heat storage process and the heat release process, the same heat exchange pipe is used for the heat exchange medium, use of two heat exchange pipelines is avoided, and the heat exchange efficiency is improved. Effective volume of the heat storage body is increased, heat exchange network and control are simplified, and heat exchange efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat storage and release equipment, and in particular, to a heat storage device and a heat storage and release system. Background Art

[0002] With the development of science and technology and the emphasis on environmental protection, wind power, photovoltaic power and other environmentally friendly but highly unstable new energy sources are increasingly connected to the grid for power generation. In order to absorb new energy and considering the current situation of gradually increasing peak-to-valley differences in electricity load, the generator sets have to carry out deep peak regulation. By configuring a heat storage device in a thermal power plant, the peak regulation capacity of the unit can be improved to a certain extent. In the related technology, the heat storage process of the heat storage device, whether it is using high-temperature flue gas or high-temperature steam, is a separate heat charging pipeline and system when charging; when releasing heat, firstly, heat is taken from the heat storage device through an intermediate heat medium (such as air), and then another heat exchanger is used to exchange heat between the intermediate heat medium and, for example, water vapor, etc., involving two heat exchanges, low efficiency, and a complex system. Summary of the invention

[0003] The purpose of the present disclosure is to provide a heat storage device and a heat storage and release system, which can reduce the heat loss caused by secondary heat exchange to improve the heat exchange efficiency.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a heat storage device, comprising: a heat storage unit; a heat exchange tube, wherein the heat exchange tube at least partially penetrates the heat storage unit so that a first heat exchange medium flowing through the heat exchange tube can absorb heat from the heat storage unit, and a second heat exchange medium flowing through the heat exchange tube can release heat to the heat storage unit; a first interface tube, connected to the heat exchange tube, for providing the first heat exchange medium or the second heat exchange medium to the heat exchange tube; and a second interface tube, connected to the heat exchange tube, for discharging the first heat exchange medium or the second heat exchange medium after heat exchange from the heat exchange tube.

[0005] Optionally, the heat storage unit includes a heat storage material, the heat storage material includes a carbonaceous component and a graphite component, or the heat storage material includes a carbonaceous component, a graphite component and inorganic oxide particles.

[0006] Optionally, the carbonaceous component includes amorphous carbon, the graphite component includes at least one of natural graphite and artificial graphite, and the inorganic oxide particles include at least one of silicon oxide, boron oxide, zirconium oxide, titanium oxide and silicon carbide.

[0007] Optionally, based on the total weight of the heat storage material, the amount of the carbonaceous component is 8-30% by weight, the amount of the graphite component is 70-92% by weight, and the amount of the inorganic oxide particles is 0-15% by weight.

[0008] Optionally, the heat storage device further includes a protective shell, the heat storage unit is arranged in the protective shell, the inlet and outlet of the heat exchange tube are located outside the protective shell, and the protective shell is provided with a carbon monoxide sensor for detecting the carbon monoxide content in the protective shell.

[0009] Optionally, the protective shell is filled with protective gas, and a pressure sensor for detecting the pressure inside the protective shell is provided on the protective shell.

[0010] Optionally, the heat exchange tube includes a plurality of first heat exchange mother tubes connected to the first interface tube and arranged side by side, a plurality of second heat exchange mother tubes connected to the second interface tube and arranged side by side, and heat exchange sub-tubes; the plurality of first heat exchange mother tubes and the plurality of second heat exchange mother tubes are respectively located on two opposite outer sides of the protective shell and are arranged symmetrically, and the symmetrically arranged first heat exchange mother tubes and the second heat exchange mother tubes are both connected to a plurality of heat exchange sub-tubes that penetrate the protective shell and are arranged side by side.

[0011] According to a second aspect of the present disclosure, a heat storage and release system is also provided, comprising: the heat storage; a heat source; and a heat storage thermal conductor, wherein the heat storage thermal conductor is connected between the heat source and the heat storage to transfer the heat of the heat source to the heat storage.

[0012] Optionally, the heat source includes a boiler, the heat storage and heat conducting component includes a furnace heat storage pipeline, the furnace heat storage pipeline is connected between the first interface pipe and the second interface pipe, and the furnace heat storage pipeline includes a furnace heat exchange tube located in the furnace of the boiler.

[0013] Optionally, the furnace heat storage pipeline includes a furnace outlet pipe connected between the first interface pipe and the heat exchange tube in the furnace and a furnace loop pipe connected between the second interface pipe and the heat exchange tube in the furnace, and a fan is provided on the furnace outlet pipe or the furnace loop pipe.

[0014] Optionally, the heat source includes a steam turbine unit, the steam turbine unit includes an inlet steam main pipe and an outlet steam main pipe, the heat storage and heat conductive component includes a steam turbine unit heat storage pipeline, the steam turbine unit heat storage pipeline includes a steam turbine unit loop pipe and a steam turbine unit outlet pipe, the steam turbine unit outlet pipe is connected between the first interface pipe and the inlet steam main pipe, and the steam turbine unit loop pipe is connected between the second interface pipe and the outlet steam main pipe.

[0015] Optionally, the heat source further includes an electric heater, the heat storage and heat conducting component is a heating tube of the electric heater, and the heating tube is at least partially located in the heat storage unit.

[0016] Optionally, the heat storage and release system also includes a heat-releasing heat conductive component, which includes an inlet pipeline connected to the first interface pipe and an outlet pipeline connected to the second interface pipe; the inlet of the inlet pipeline is used to be connected to the outlet steam main pipe of the steam turbine unit, and the outlet of the outlet pipeline is used to be connected to the inlet steam main pipe of the steam turbine unit; and / or, the inlet of the inlet pipeline is used to be connected to the feed water main pipe of the boiler, and the outlet pipeline is used to be connected to the inlet steam main pipe of the steam turbine unit.

[0017] Through the above technical solution, the second heat exchange medium can enter the heat exchange tube from the first interface pipe, release heat in the heat exchange tube, and then leave the heat exchange tube from the second interface pipe. The first heat exchange medium can enter the heat exchange tube from the first interface pipe, absorb heat in the heat exchange tube, and then leave the heat exchange tube from the second interface pipe. The heat exchange tube at least partially penetrates the heat storage unit, so that the heat exchange medium can fully exchange heat with the heat storage unit in the heat exchange tube. In addition, during the heat storage process and the heat release process, the second heat exchange medium and the first heat exchange medium use the same set of heat exchange tubes, avoiding the use of the heat exchanger for secondary heat exchange, thereby ensuring the heat exchange efficiency.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 is a schematic structural diagram of a heat storage device provided in an exemplary embodiment of the present disclosure;

[0021] Figure 2 is a simplified schematic diagram of a heat storage and release system provided in an exemplary embodiment of the present disclosure;

[0022] Figure 3 is an equivalent schematic diagram of a heat storage and release system provided in an exemplary embodiment of the present disclosure utilizing high temperature radiant heat from a boiler furnace to store heat;

[0023] Figure 4 is an equivalent schematic diagram of a heat storage and release system provided in an exemplary embodiment of the present disclosure utilizing steam heat storage from an inlet steam main pipe of a steam turbine unit;

[0024] Figure 5 is an equivalent schematic diagram of a heat storage and release system provided in an exemplary embodiment of the present disclosure when utilizing valley electricity to store heat through an electric heater;

[0025] Figure 6It is an equivalent schematic diagram of the heat storage and release system provided in the exemplary embodiment of the present disclosure using the heat stored in the heat storage device to provide high-temperature steam for the steam turbine unit.

[0026] Description of Reference Numerals

[0027] 1-heat storage; 101-first interface pipe; 102-heat exchange tube; 1021-first heat exchange mother pipe; 1022-second heat exchange mother pipe; 1023-heat exchange sub-tube; 103-second interface pipe; 104-protection shell; 105-air exchange inlet; 2-boiler; 301-furnace outflow pipe; 302-furnace heat exchange tube; 303-furnace return pipe; 4-fan; 501-steam turbine; 502-inlet steam mother pipe; 503-outlet steam mother pipe; 601-steam turbine unit outflow pipe 1-10-11-12-13-14 15-16-17-18 19-11-19 11-11-12-13 15-16-17-18 19-11-12-13 15-16-17-18 19-11-12-13 15-16-17-18 19-11-12-13 15-16-17-18 19-11-12-13 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 15-16-17-18 DETAILED DESCRIPTION

[0028] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0029] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the "upper" and "lower" relative to the gravity direction when the corresponding parts are in use, and "inner" and "outer" refer to the inside and outside relative to the outline of the parts or structures themselves. In addition, it should be noted that the terms used, such as "first" and "second", etc., are used to distinguish one element from another element and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0030] According to a specific embodiment of the first aspect of the present disclosure, a heat storage device 1 is provided, referring to Figure 1As shown, the heat storage device 1 includes a heat storage unit, a heat exchange tube 102, a first interface tube 101 and a second interface tube 103. The heat exchange tube 102 at least partially penetrates the heat storage unit so that the first heat exchange medium flowing through the heat exchange tube 102 can absorb the heat of the heat storage unit, and the second heat exchange medium flowing through the heat exchange tube 102 can release heat to the heat storage unit; the first interface tube 101 is connected to the heat exchange tube 102 to provide the first heat exchange medium or the second heat exchange medium to the heat exchange tube 102; the second interface tube 103 is connected to the heat exchange tube 102 to discharge the first heat exchange medium or the second heat exchange medium after heat exchange from the heat exchange tube 102.

[0031] Through the above technical solution, the second heat exchange medium can enter the heat exchange tube from the first interface pipe, release heat in the heat exchange tube, and then leave the heat exchange tube from the second interface pipe. The first heat exchange medium can enter the heat exchange tube from the first interface pipe, absorb heat in the heat exchange tube, and then leave the heat exchange tube from the second interface pipe. The heat exchange tube at least partially penetrates the heat storage unit, so that the heat exchange medium can fully exchange heat with the heat storage unit in the heat exchange tube. In addition, during the heat storage process and the heat release process, the second heat exchange medium and the first heat exchange medium use the same set of heat exchange tubes, avoiding the use of the heat exchanger for secondary heat exchange, thereby ensuring the heat exchange efficiency.

[0032] The heat storage unit includes a heat storage material. In order to increase the heat storage density and thermal conductivity of the heat storage material, the heat storage material includes a carbonaceous component, a graphite component, or the heat storage material includes a carbonaceous component, a graphite component and inorganic oxide particles.

[0033] The carbonaceous component includes amorphous carbon, which is formed by high-temperature carbonization of a binder (asphalt or resin), the graphite component includes at least one of natural graphite and artificial graphite, and the inorganic oxide particles include at least one of silicon oxide, boron oxide, zirconium oxide, titanium oxide and silicon carbide.

[0034] Among them, based on the total weight of the heat storage material, the amount of carbonaceous components is 8-30% by weight, the amount of graphite components is 70-92% by weight, and the amount of inorganic oxide particles is 0-15% by weight. Specifically, the inorganic oxide particles have a particle size of 50-200 μm and contain at least one of silicon oxide, boron oxide, zirconium oxide, titanium oxide, and silicon carbide. The heat storage temperature of the heat storage material can reach up to 900°C, the thermal conductivity can reach up to 100W / mk, and the heat storage density is 900kJ / kg.

[0035] In the present disclosure, regarding the preparation of heat storage materials, the above-mentioned carbonaceous components, graphite components and inorganic oxide particles can be uniformly mixed in a certain proportion to obtain a mixture, the mixture is molded, and the molded blocks produced after molding are subjected to high-temperature heat treatment to finally obtain the heat storage material.

[0036] In order to monitor whether the heat exchange tube is leaking, refer to Figure 1 As shown in , the heat storage device 1 further includes a protective shell 104, the heat storage unit is arranged in the protective shell 104, and the inlet and outlet of the heat exchange tube 102 are located outside the protective shell 104. Since the heat exchange tube 102 at least partially penetrates the heat storage unit, when the heat exchange tube 102 leaks, the heat exchange medium flowing inside the heat exchange tube 102 will also directly contact the heat storage material. When the heat exchange medium is water vapor, since the carbonaceous component is used as a component of the heat storage material, the water vapor and the heat storage material will react with water gas to produce carbon monoxide and hydrogen. The protective shell 104 can also prevent carbon monoxide and hydrogen from contacting with oxygen and exploding in a high temperature environment. In order to detect whether part of the heat exchange tube 102 in the protective shell 104 is leaking, a carbon monoxide sensor for detecting the carbon monoxide content in the protective shell 104 is provided on the protective shell 104. The number of carbon monoxide sensors can be multiple, and the multiple carbon monoxide sensors are respectively arranged at different positions in the protective shell 104, so as to be able to timely and accurately detect the carbon monoxide content in the protective shell 104. When the carbon monoxide sensor detects that the carbon monoxide content is not 0, the carbon monoxide sensor sends out an alarm to notify the on-site staff to handle it.

[0037] In order to further increase the safety level of the heat storage device 1, the protective shell 104 is filled with a protective gas. The protective gas can be a nitrogen-like gas with stable chemical properties or an inert gas such as helium. Since the protective gas does not react with the heat storage material or with hydrogen or carbon monoxide that may be produced, the safety level of the heat storage device 1 can be improved. At the same time, a pressure sensor for detecting the pressure inside the protective shell 104 is provided on the protective shell 104. When the protective shell 104 leaks, the pressure inside the protective shell 104 will drop abnormally. When the heat exchange tube 102 inside the protective shell 104 leaks, the pressure inside the protective shell 104 will increase abnormally. When the pressure sensor detects that the pressure inside the protective shell 104 is abnormal, it will sound an alarm to notify the on-site staff to handle it.

[0038] In the heat storage device 1, the heat release process and the heat storage process share the same set of heat exchange tubes 102, see Figure 1As shown in, the heat exchange tube 102 includes a plurality of first heat exchange mother tubes 1021 connected to the first interface tube 101 and arranged side by side, a plurality of second heat exchange mother tubes 1022 connected to the second interface tube 103 and arranged side by side, and a heat exchange sub-tube 1023; the plurality of first heat exchange mother tubes 1021 and the plurality of second heat exchange mother tubes 1022 are respectively located on two opposite outer sides of the protective shell 104 and are symmetrically arranged, and the symmetrically arranged first heat exchange mother tubes 1021 and second heat exchange mother tubes 1022 are both connected with a plurality of heat exchange sub-tubes 1023 that penetrate the protective shell 104 and are arranged side by side, wherein the heat storage material can be processed into any suitable shape to be placed in the protective shell 104, for example, the heat storage material can be processed into a block, and a plurality of block-shaped heat storage materials are arranged in a matrix to form an integral heat storage unit, and the present disclosure does not impose any limitation on this. Compared with the related art, this simplifies the system and reduces the space occupied by a set of heat exchange tubes 102 in a limited heat storage body space. At the same time, the heat storage capacity can be increased by increasing the volume or quantity of the heat storage material or the heat exchange area can be increased by increasing the number of heat exchange sub-tubes 1023.

[0039] According to the second aspect of the present disclosure, Figures 1 to 6 As shown, a heat storage and release system is also provided, including a heat storage device 1, a heat source and a heat storage thermal conductor, wherein the heat storage thermal conductor is connected between the heat source and the heat storage device 1 to transfer the heat of the heat source to the heat storage device 1.

[0040] The heat source can adopt any suitable heat source according to the actual application requirements. For example, the system can utilize the high-temperature radiant heat of the furnace of the boiler 2 in the power plant, the high-temperature steam of the turbine unit and valley electricity heating as heat sources, and convert them into thermal energy and store them in the heat storage device 1.

[0041] In an embodiment in which the high-temperature radiant heat of the furnace of the boiler 2 is used as the heat source, the heat source includes the boiler 2, the heat storage and heat conductive component includes a furnace heat storage pipeline, the furnace heat storage pipeline is filled with a second heat exchange medium, the furnace heat storage pipeline is connected between the first interface pipe 101 and the second interface pipe 103, the furnace heat storage pipeline includes a furnace heat exchange pipe 302 located in the furnace of the boiler 2, a furnace outlet pipe 301 connected between the first interface pipe 101 and the furnace heat exchange pipe 302, and a furnace return pipe 303 connected between the second interface pipe 103 and the furnace heat exchange pipe 302, and a fan 4 is arranged on the furnace outlet pipe 301 or the furnace return pipe 303.

[0042] In order to exchange heat with the high temperature radiation heat of the furnace of the boiler 2, the second heat exchange medium can be a chemically stable gas such as nitrogen, an inert gas such as helium, or a mixed gas of a chemically stable gas and an inert gas. Figure 2As shown in the figure, taking the case where a fan 4 is arranged on the furnace loop pipe 303 and nitrogen is used as the second heat exchange medium, the nitrogen leaves the heat exchange pipe 102 from the second interface pipe 103 under the action of the fan 4, enters the heat exchange pipe 302 in the furnace through the furnace loop pipe 303, and exchanges heat with the furnace at the heat exchange pipe 302 in the furnace to absorb heat. The nitrogen that obtains the heat in the furnace of the boiler 2 returns to the heat exchange pipe 102 from the first interface pipe 101 through the furnace outgoing pipe 301, and exchanges heat with the heat storage material at the heat exchange pipe 102 to release heat. The heat storage device 1 stores the heat brought by the nitrogen to the boiler through the heat storage material. 2, and discharges the heat-exchanged nitrogen from the heat exchange pipe 102 from the second interface pipe 103. The nitrogen leaving the heat exchange pipe 102 continues to enter the heat exchange pipe 302 in the furnace through the furnace loop pipe 303 to exchange heat with the furnace and absorb heat. The nitrogen that regains the heat in the furnace of the boiler 2 returns to the heat exchange pipe 102 from the first interface pipe 101 through the furnace outgoing pipe 301, and exchanges heat with the heat storage material at the heat exchange pipe 102 to release heat. The heat storage device 1 stores the heat in the furnace of the boiler 2 brought by the nitrogen through the heat storage material, and repeats this process until the heat storage device 1 stores enough heat.

[0043] In an embodiment in which the high-temperature steam of a steam turbine unit is used as a heat source, the heat source includes a steam turbine unit, the steam turbine unit includes an inlet steam main pipe 502 and an outlet steam main pipe 503, the heat storage and heat conductive component includes a steam turbine unit heat storage pipeline, the steam turbine unit heat storage pipeline is filled with a second heat exchange medium (high-temperature steam), the steam turbine unit heat storage pipeline includes a steam turbine unit loop pipe 602 and a steam turbine unit outlet pipe 601, the steam turbine unit outlet pipe 601 is connected between the first interface pipe 101 and the inlet steam main pipe 502, and the steam turbine unit loop pipe 602 is connected between the second interface pipe 103 and the outlet steam main pipe 503.

[0044] The steam turbine unit includes a steam turbine 501. The high-temperature steam sent from the inlet steam main pipe 502 passes through a fixed nozzle to become an accelerated airflow and then sprayed onto the blades of the steam turbine 501. The gas expands and performs work externally, realizing the conversion of internal energy into mechanical energy, so that the rotor with the blade row rotates. After the internal energy is released, the steam temperature decreases, and the low-temperature steam leaves from the outlet steam main pipe 503. Therefore, the second heat exchange medium can be steam, refer to Figure 2As shown in FIG. 1 , since the circulation system of the steam turbine unit itself is equipped with a pump, the steam enters the heat exchange tube 102 from the first interface pipe 101 through the steam turbine unit outgoing pipe 601 from the inlet steam main pipe 502 under the action of the pump, and exchanges heat with the heat storage material at the heat exchange tube 102 to release heat. The heat storage device 1 stores the heat brought by the steam through the heat storage material, and discharges the steam after heat exchange from the heat exchange tube 102 from the second interface pipe 103. The steam leaving the heat exchange tube 102 enters the steam turbine unit return pipe 602 through the steam turbine unit return pipe 603. The steam inlet and outlet steam main pipe 503 returns to the circulation system of the steam turbine unit. In the circulation system of the steam turbine unit, the steam that has regained heat enters the heat exchange tube 102 from the first interface pipe 101 through the steam turbine unit outgoing pipe 601 from the inlet steam main pipe 502 under the action of the pump in the circulation system of the steam turbine unit itself, and exchanges heat with the heat storage material at the heat exchange tube 102 to release heat. The heat storage device 1 stores the heat brought by the steam through the heat storage material, and this cycle is repeated until the heat storage device 1 stores enough heat.

[0045] In the embodiment using valley electric heating as the heat source, the heat source further includes an electric heater, and the heat storage and heat conducting member is a heating tube 7 of the electric heater, and the heating tube 7 is at least partially located in the heat storage unit.

[0046] The electricity used during the off-peak period is called valley electricity. In order to utilize valley electricity, the electric energy of valley electricity can be converted into thermal energy and stored through an electric heater. The heating tube 7 of the electric heater converts the electric energy into thermal energy. Figure 2 As shown in the figure, the heated heating tube 7 is at least partially located in the heat storage unit, so it can directly exchange heat with the heat storage material of the heat storage unit. The heat storage device 1 stores the heat converted from valley electricity through the heat storage material, and the valley electricity is continuously converted into thermal energy by the heating tube 7 until the heat storage device 1 stores enough heat.

[0047] During the heat storage process, the above three heat sources can be stored separately or in pairs or in a mixture of three. For example, the high-temperature steam of the steam turbine unit is first used as a heat source to heat the heat storage material to 400°C, and then valley electricity is used for electrical heating to raise the temperature of the heat storage material to 800°C; the high-temperature radiant heat of the furnace of the boiler 2 can be first used to heat the heat storage material to 500°C, and then valley electricity is used for electrical heating to raise the temperature of the heat storage material to 800°C; the high-temperature steam of the steam turbine unit can be first used as a heat source to heat the heat storage material to 400°C, and then the high-temperature radiant heat of the furnace of the boiler 2 can be used to heat the heat storage material to 500°C, and then valley electricity is used for electrical heating to raise the temperature of the heat storage material to 800°C.

[0048] When utilizing the high-temperature radiant heat from the furnace of the boiler 2, the heat exchange medium used is an inert gas or a chemically stable gas, and when utilizing the high-temperature steam from the steam turbine unit, the heat exchange medium used is steam. Therefore, in the process of exchanging the heat source for heat storage, the air exchange inlet 105 and the air exchange outlet (not shown in the figure) reserved on the heat storage device 1 can be used to purge the heat storage pipe to completely exclude another heat exchange medium, or the purge can be omitted to avoid heat waste. The influence of a small amount of other heat exchange medium on the heat exchange process of the entire system can be ignored.

[0049] In addition to being able to store heat, the system can also utilize the stored heat. In order to release the stored heat, the heat storage and release system also includes a heat release heat conductive member, which includes an inlet pipe 9 connected to the first interface pipe 101 and an outlet pipe 8 connected to the second interface pipe 103. Figure 2 As shown in , in order to provide the stored heat to the steam turbine unit, the outlet of the outlet pipeline 8 can be used to connect to the inlet steam main pipe 502 of the steam turbine unit, and in order to obtain the heat exchange medium, the inlet of the inlet pipeline 9 can be used to connect to the outlet steam main pipe 503 of the steam turbine unit. In order to increase the pressure in the pipeline, a pipeline booster pump 10 can be provided on the inlet pipeline 9. Under the action of the pipeline booster pump 10, the steam in the outlet steam main pipe 503 enters the heat exchange pipe 102 from the first interface pipe 101 through the inlet pipeline 9, and exchanges heat with the heat storage material at the heat exchange pipe 102 to absorb heat. The steam after heat exchange leaves the heat exchange pipe 102 from the second interface pipe 103, and the steam leaving the heat exchange pipe 102 enters the inlet steam main pipe through the turbine unit loop pipe 602, and joins the circulation system of the turbine unit, expands and does work, and realizes heat conversion.

[0050] In addition to using the steam at the outlet steam main pipe 503 as the heat exchange medium, boiler feed water can also be used as the heat exchange medium, so the inlet of the inlet pipeline 9 can also be used to connect to the water supply main pipe of the boiler 2. Since the water supply main pipe of the boiler 2 is originally provided with a water pump and a stop valve, the boiler feed water in the water supply main pipe enters the heat exchange tube 102 from the first interface pipe 101 through the inlet pipeline 9 under the action of the water pump, and exchanges heat with the heat storage material at the heat exchange tube 102, and turns into steam after absorbing heat. The steam after heat exchange leaves the heat exchange tube 102 from the second interface pipe 103, and the steam leaving the heat exchange tube 102 enters the inlet steam main pipe through the turbine unit loop pipe 602, and joins the circulation system of the turbine unit, expands and does work, and realizes heat conversion.

[0051] In this system, the heat storage and heat release of the heat storage device 1 use a set of pipelines. A stop valve can be set on the pipeline to avoid cross-flow of the heat exchange medium by adjusting the opening and closing of the stop valve. Figure 2As shown in , the first interface pipe 101 is provided with a first stop valve 1101, and the second interface pipe 103 is provided with a second stop valve 1102. The first stop valve 1101 and the second stop valve 1102 play the role of master control. Closing the first stop valve 1101 can close all pipelines entering the heat storage device 1, and closing the second stop valve 1102 can close all pipelines leaving the heat storage device 1. The furnace outflow pipe 301 is provided with a third stop valve 1103, and the furnace loop pipe 303 is provided with a fourth stop valve 1104 and a fifth stop valve 1105, wherein the fourth stop valve 1104 is upstream of the fan 4, and the fifth stop valve 1105 is downstream of the fan 4. The third stop valve 1103 is used to control the on-off of the furnace outflow pipe 301, and the fourth stop valve 1104 and the fifth stop valve 1105 are used to control the on-off of the furnace loop pipe 303. The stop valves are respectively provided before and after the fan 4, which can also protect the fan 4. The steam turbine unit outgoing pipe 601 is provided with a sixth stop valve 1106 and a seventh stop valve 1107, and the steam turbine unit return pipe 602 is provided with an eighth stop valve 1108. In order to save the pipeline area, the outlet of the outlet pipeline 8 can be connected between the sixth stop valve 1106 and the seventh stop valve 1107, and the sixth stop valve 1106 and the seventh stop valve 1107 are used to control the on-off of the steam turbine unit outgoing pipe 601, and also control whether the inlet steam main pipe 502 can be connected to the outlet pipeline 8 through the steam turbine unit outgoing pipe 601. At the same time, the outlet pipeline 8 is provided with a ninth stop valve 1109, and the inlet pipeline is provided with a tenth stop valve 1110 and an eleventh stop valve 1111, wherein the tenth stop valve 1110 is upstream of the pipeline booster pump 10, and the eleventh stop valve 1111 is downstream of the pipeline booster pump 10.

[0052] The present disclosure describes the working process of the heat storage and release system by way of example. For example, the high-temperature steam of the steam turbine unit is first used as a heat source to heat the heat storage material to 400°C. At this time, the sixth stop valve 1106, the seventh stop valve 1107, the first stop valve 1101, the second stop valve 1102 and the eighth stop valve 1108 are opened, and the other stop valves are closed. The entire pipeline is formed as follows under the action of the stop valves: Figure 4As shown in the pipeline, since the circulation system of the steam turbine unit itself has a pump, the steam enters the heat exchange tube 102 from the first interface pipe 101 through the steam turbine unit outflow pipe 601 from the inlet steam main pipe 502 under the action of the pump, and exchanges heat with the heat storage material at the heat exchange tube 102 to release heat. The heat storage device 1 stores the heat brought by the steam through the heat storage material, and discharges the steam after heat exchange from the heat exchange tube 102 from the second interface pipe 103. The steam leaving the heat exchange tube 102 is discharged from the steam turbine unit return pipe 602. Enter the outlet steam main pipe 503 and return to the circulation system of the steam turbine unit. In the circulation system of the steam turbine unit, the steam that has regained heat enters the heat exchange tube 102 from the inlet steam main pipe 502 through the steam turbine unit outgoing pipe 601 and the first interface pipe 101 under the action of the pump in the circulation system of the steam turbine unit itself, and exchanges heat with the heat storage material at the heat exchange tube 102 to release heat. The heat storage device 1 stores the heat brought by the steam through the heat storage material, and this cycle is repeated until the heat storage device 1 stores enough heat.

[0053] After reaching 400°C, the high temperature radiation heat from the furnace of the boiler 2 can be used to heat the heat storage material to 500°C. Before switching the heat source, the heat exchange tube 102 can be ventilated and purged. Before purging, all stop valves are closed, nitrogen is introduced from the ventilation inlet 105 reserved on the heat exchange tube 102, and the steam originally in the heat exchange tube 102 is discharged from the ventilation outlet (not shown in the figure).

[0054] After the purge is completed, the third stop valve 1103, the fourth stop valve 1104, the fifth stop valve 1105, the first stop valve 1101, and the second stop valve 1102 are opened, and the other stop valves are closed. The entire pipeline is formed as follows under the action of the stop valves. Figure 3 The pipeline shown, at this time, the fan 4 is turned on, and the nitrogen leaves the heat exchange tube 102 from the second interface pipe 103 under the action of the fan 4, enters the heat exchange tube 302 in the furnace through the furnace loop pipe 303, and exchanges heat with the furnace at the heat exchange tube 302 in the furnace to absorb heat. The nitrogen that obtains the heat in the furnace of the boiler 2 returns to the heat exchange tube 102 from the first interface pipe 101 through the furnace outgoing pipe 301, and exchanges heat with the heat storage material at the heat exchange tube 102 to release heat. The heat storage device 1 stores the heat in the furnace of the boiler 2 brought by the nitrogen through the heat storage material, and The nitrogen after heat exchange is discharged from the heat exchange tube 102 from the second interface tube 103, and the nitrogen leaving the heat exchange tube 102 enters the heat exchange tube 302 in the furnace through the furnace loop tube 303 to exchange heat with the furnace and absorb heat. The nitrogen that regains the heat in the furnace of the boiler 2 returns to the heat exchange tube 102 from the first interface tube 101 through the furnace outflow tube 301, and exchanges heat with the heat storage material at the heat exchange tube 102 to release heat. The heat storage device 1 stores the heat in the furnace of the boiler 2 brought by the nitrogen through the heat storage material, and repeats this process until the heat storage device 1 stores enough heat.

[0055] After reaching 500℃, valley electricity can be used to raise the temperature of the heat storage material to 800℃. At this time, all stop valves are closed, and the entire pipeline is formed under the action of the stop valves. Figure 5 The pipeline shown in the figure starts the electric heater, and the heating tube 7 of the electric heater converts electrical energy into thermal energy. The heated heating tube 7 is at least partially located in the heat storage unit, so it can directly exchange heat with the heat storage material of the heat storage unit. The heat storage unit 1 stores the heat converted from valley electricity through the heat storage material, and the valley electricity is continuously converted into thermal energy by the heating tube 7 until the heat storage unit 1 stores enough heat.

[0056] When the heat stored in the heat storage device 1 needs to be used, the first stop valve 1101, the second stop valve 1102, the seventh stop valve 1107, the ninth stop valve 1109, the tenth stop valve 1110 and the eleventh stop valve 1111 can be opened, and the other stop valves can be closed. Figure 6 In the pipeline shown, the pipeline booster pump 10 is turned on at this time. Under the action of the pipeline booster pump 10, the steam in the outlet steam mother pipe 503 enters the heat exchange tube 102 from the first interface pipe 101 via the inlet pipeline 9, and exchanges heat with the heat storage material at the heat exchange tube 102 to absorb heat. The steam after heat exchange leaves the heat exchange tube 102 from the second interface pipe 103, and the steam leaving the heat exchange tube 102 enters the inlet steam mother pipe via the turbine unit loop pipe 602, and joins the circulation system of the turbine unit to expand and do work to achieve heat conversion.

[0057] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0059] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A heat storage device, characterized in that: include: Thermal storage unit; a heat exchange tube, wherein the heat exchange tube at least partially penetrates the heat storage unit so that a first heat exchange medium flowing through the heat exchange tube can absorb heat from the heat storage unit and a second heat exchange medium flowing through the heat exchange tube can release heat to the heat storage unit; a first interface pipe, connected to the heat exchange pipe, for providing the first heat exchange medium or the second heat exchange medium to the heat exchange pipe; as well as The second interface pipe is communicated with the heat exchange pipe and is used for discharging the first heat exchange medium or the second heat exchange medium after heat exchange from the heat exchange pipe.

2. The heat storage device according to claim 1, characterized in that: The heat storage unit includes a heat storage material, wherein the heat storage material includes a carbonaceous component and a graphite component, or the heat storage material includes a carbonaceous component, a graphite component and inorganic oxide particles.

3. The heat storage device according to claim 2, characterized in that: The carbonaceous component includes amorphous carbon, the graphite component includes at least one of natural graphite and artificial graphite, and the inorganic oxide particles include at least one of silicon oxide, boron oxide, zirconium oxide, titanium oxide and silicon carbide.

4. The heat storage device according to claim 2 or 3, characterized in that: Based on the total weight of the heat storage material, the amount of the carbonaceous component is 8-30% by weight, the amount of the graphite component is 70-92% by weight, and the amount of the inorganic oxide particles is 0-15% by weight.

5. The heat storage device according to claim 2, characterized in that: The heat storage device also includes a protective shell, the heat storage unit is arranged in the protective shell, the inlet and outlet of the heat exchange tube are located outside the protective shell, and a carbon monoxide sensor for detecting the carbon monoxide content in the protective shell is provided on the protective shell.

6. The heat storage device according to claim 5, characterized in that The protective shell is filled with protective gas, and a pressure sensor for detecting the pressure inside the protective shell is arranged on the protective shell.

7. The heat storage device according to claim 5, characterized in that The heat exchange tubes include a plurality of first heat exchange mother tubes connected to the first interface tube and arranged side by side, a plurality of second heat exchange mother tubes connected to the second interface tube and arranged side by side, and heat exchange sub-tubes; the plurality of first heat exchange mother tubes and the plurality of second heat exchange mother tubes are respectively located on two opposite outer sides of the protective shell and are arranged symmetrically, and the symmetrically arranged first heat exchange mother tubes and the second heat exchange mother tubes are both connected to a plurality of heat exchange sub-tubes that penetrate the protective shell and are arranged side by side.

8. A heat storage and release system, characterized in that: include: The heat storage device according to any one of claims 1 to 7; Heat source; as well as A heat storage conductive member is connected between the heat source and the heat storage device to transfer the heat of the heat source to the heat storage device.

9. The heat storage and release system according to claim 8, characterized in that: The heat source includes a boiler, the heat storage and heat conducting component includes a furnace heat storage pipeline, the furnace heat storage pipeline is connected between the first interface pipe and the second interface pipe, and the furnace heat storage pipeline includes a furnace heat exchange pipe located in the furnace of the boiler.

10. The heat storage and release system according to claim 9, characterized in that: The furnace heat storage pipeline includes a furnace outgoing pipe connected between the first interface pipe and the heat exchange tube in the furnace and a furnace return pipe connected between the second interface pipe and the heat exchange tube in the furnace. A fan is provided on the furnace outgoing pipe or the furnace return pipe.

11. The heat storage and release system according to claim 8, characterized in that: The heat source includes a steam turbine unit, the steam turbine unit includes an inlet steam main pipe and an outlet steam main pipe, the heat storage and heat conductive component includes a steam turbine unit heat storage pipeline, the steam turbine unit heat storage pipeline includes a steam turbine unit loop pipe and a steam turbine unit outlet pipe, the steam turbine unit outlet pipe is connected between the first interface pipe and the inlet steam main pipe, and the steam turbine unit loop pipe is connected between the second interface pipe and the outlet steam main pipe.

12. The heat storage and release system according to claim 8, characterized in that: The heat source also includes an electric heater, the heat storage and heat conducting member is a heating tube of the electric heater, and the heating tube is at least partially located in the heat storage unit.

13. The heat storage and release system according to claim 8, characterized in that: The heat storage and release system further comprises a heat releasing heat conducting member, wherein the heat releasing heat conducting member comprises an inlet pipeline connected to the first interface pipe and an outlet pipeline connected to the second interface pipe; The inlet of the inlet pipeline is used to be connected to the outlet steam main pipe of the steam turbine unit, and the outlet of the outlet pipeline is used to be connected to the inlet steam main pipe of the steam turbine unit; and / or, The inlet of the inlet pipeline is also used to be connected to the water supply main pipe of the boiler, and the outlet pipeline is used to be connected to the inlet steam main pipe of the steam turbine unit.

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