Heat supply system based on solid heat storage

Abstract

The invention relates to a heat supply system based on solid heat storage, and the system comprises a solid heat storage module which is heated in an electric heating manner; the heat supply network structure is internally provided with a liquid channel; the heat preservation tank is connected to the heat supply network structure; under the condition that the temperature of the solid heat storage module rises to a first preset temperature, the gas is heated by the solid heat storage module to form high-temperature gas, and heat is supplied to the heat supply network structure, so that the heat supply network structure outputs heat supply hot water, and / or the heat supply hot water is stored in the heat preservation tank; and under the conditions that the temperature of the solid heat storage module stops rising and the temperature of the solid heat storage module is lower than a second preset temperature, heat is supplied to the heat supply network structure through the high-temperature liquid stored in the heat preservation tank. And the solid heat storage module stores heat in the low-price power supply time period and releases heat in the power supply stopping time period, so that the effects of reducing emission of fire coal pollutants and reducing the heating cost are achieved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of solid heat storage and supply, and particularly relates to a heat supply system based on solid heat storage. BACKGROUND

[0002] During the winter heating period, coal-fired heating is usually needed, which is easy to pollute the environment and cause haze, especially the coal stoves of rural residents in winter and the industrial boilers without cleaning and purifying devices, the flue gas and coal fines generated by combustion will be directly discharged into the air, causing air pollution. In the related art, coal stoves and industrial boilers are gradually replaced by electric heating to reduce the emission of coal pollution. However, the cost of electric heating is relatively high, and the cheap valley electricity and new energy electricity such as wind power at night usually have time limit, which is difficult to utilize.

[0003] Therefore, it is necessary to provide a heat supply system based on solid heat storage to at least partially solve the problems in the prior art. SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems in the prior art or related art.

[0005] To this end, the present disclosure provides a heat supply system based on solid heat storage.

[0006] Therefore, according to the embodiments of the present disclosure, a heat supply system based on solid heat storage is provided, which comprises:

[0007] The solid heat storage module is heated by electric heating;

[0008] The heat network structure is internally provided with a liquid channel, the liquid channel is formed with an inlet end and an outlet end, the inlet end is used for inputting heat supply return water, and the outlet end is used for outputting heat supply hot water;

[0009] The heat preservation tank is formed with an input end and an output end, the output end is connected to the inlet end through a first valve body, the input end is connected to the outlet end through a second valve body, and the heat preservation tank is used for storing the liquid output by the heat network structure;

[0010] When the solid heat storage module is heated to a first preset temperature, the gas is heated by the solid heat storage module to form high-temperature gas, and the heat network structure is heated by the high-temperature gas to output the heat supply hot water from the outlet end and / or store the heat supply hot water in the heat preservation tank;

[0011] When the solid heat storage module stops heating and the temperature of the solid heat storage module is lower than a second preset temperature, the first valve body is opened, and the heat network structure is heated by the high-temperature liquid stored in the heat preservation tank;

[0012] wherein the first preset temperature is higher than the second preset temperature.

[0013] In an embodiment, when the solid heat storage module stops heating and the temperature is between the first preset temperature and the second preset temperature, the solid heat storage module releases the stored heat energy to heat the gas to a high-temperature gas, the heat network structure is heated by the high-temperature gas to output the heating hot water from the liquid outlet, and / or the heating hot water is stored in the heat preservation tank.

[0014] In an embodiment, the gas is flue gas after dust removal of a boiler, the flue gas temperature is 120-150°C, and the flue gas temperature reaches 180-800°C after being heated by the solid heat storage module; or

[0015] the gas is air after heat exchange with the heat network structure, the air temperature is 50-60°C, and the air temperature reaches 180-800°C after being heated by the solid heat storage module.

[0016] In an embodiment, the heat preservation tank is a thermocline heat storage water tank.

[0017] In an embodiment, the solid heat storage module comprises:

[0018] a plurality of solid heat storage units, the solid heat storage units are in a cylindrical structure as a whole, and the middle part of the cylindrical structure is used to pass the gas;

[0019] a support frame, and the plurality of solid heat storage units are arranged on the support frame.

[0020] In an embodiment, the solid heat storage module further comprises:

[0021] a limiting piece arranged between the gaps of adjacent solid heat storage units to limit the solid heat storage units, and the limiting piece is used to block the flow of the gas.

[0022] In an embodiment, the number of the solid heat storage units is 1000-2000, and the solid heat storage module composed of the plurality of solid heat storage units is in a cubic structure as a whole.

[0023] In an embodiment, the solid heat storage unit comprises:

[0024] a pipe body;

[0025] an electric heating rod arranged in the pipe body;

[0026] a heat storage material layer sleeved on the pipe body.

[0027] In an implementable embodiment, the heat storage material layer has a thickness of 30 to 50 mm.

[0028] The heat storage material has a thermal conductivity of 40 to 80 W / (m·K).

[0029] In an implementable embodiment, the pipe body has a wall thickness of 2 to 5 mm.

[0030] The pipe body has an inner diameter of 50 to 70 mm.

[0031] The pipe body includes a 20G pipe body, a 15CrMo pipe body, and a stainless steel pipe body.

[0032] Compared with the prior art, the present disclosure at least includes the following beneficial effects: the solid heat storage based heating system provided by the embodiments of the present disclosure is provided with a solid heat storage module, a heat network structure and an insulation tank. The solid heat storage module can be heated by electric heating and store heat energy. The heat network structure can be provided with a liquid channel, and the liquid channel is formed with an inlet end and an outlet end. The heating return water can be transported into the liquid channel through the inlet end, and the liquid in the heat network structure can exchange heat with the gas heated by the solid heat storage module to increase the temperature of the liquid, and then the heating hot water can be output through the outlet end. The insulation tank is provided with an input end and an output end, and the output end is connected to the inlet end through a first valve body, and the input end can be connected to the outlet end through a second valve body. By controlling the opening and closing of the first valve body and the second valve body, the liquid output by the heat network structure can be stored in the insulation tank, or the stored liquid can be output to the heat network structure. In this way, in the case of using cheap valley electricity and / or new energy electricity during the power generation period at night, the solid heat storage module is heated by electric heating, and when the solid heat storage module is heated to a first preset temperature, the gas can be heated by the solid heat storage module to form high-temperature gas, and the high-temperature gas flows to the heat network structure to exchange heat with the liquid in the liquid channel to heat the liquid to form heating hot water, so that the heating hot water can be output from the outlet end for heating, and the second valve body can be opened to store part of the heating hot water in the insulation tank. In other power consumption periods, the solid heat storage module stops heating and releases the stored heat energy to heat the gas to form high-temperature gas, and the high-temperature gas flows to the heat network structure to exchange heat with the liquid in the liquid channel to heat the liquid to form heating hot water, so that the heating hot water can be output from the outlet end for heating, and the second valve body can be opened to store part of the heating hot water in the insulation tank. As the heat energy stored in the solid heat storage module is consumed, when the temperature of the solid heat storage module is lower than a second preset temperature, the heat energy provided by the solid heat storage module is low, which results in a low temperature of the heated gas. By opening the first valve body, the high-temperature liquid stored in the insulation tank can be transported to the heat network structure to heat the liquid in the liquid channel, and in combination with the heating effect of the gas, the heat network structure can continuously and stably provide heating hot water. Thus, the emission of coal combustion pollutants can be reduced, and the heating cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The drawings are for purposes of illustration only and are not to be construed as limiting the present disclosure. Moreover, in the drawings, like reference numerals designate similar parts throughout the several views, and in which:

[0034] Figure 1 A schematic structural diagram of a solid heat storage based heating system according to an embodiment of the present disclosure;

[0035] Figure 2 Fig. 1 is a schematic structural diagram of another solid heat storage based heating system according to an embodiment of the present disclosure;

[0036] Figure 3 Fig. 2 is a schematic structural diagram of a solid heat storage unit according to an embodiment of the present disclosure.

[0037] wherein, Figures 1 to 3 The correspondence between the reference signs and the component names is as follows:

[0038] 100 solid heat storage based heating system, 110 solid heat storage module, 120 heat network structure, 121 liquid inlet end, 122 liquid outlet end, 130 heat preservation tank, 131 input end, 132 output end, 140 solid heat storage unit, 141 pipe body, 142 electric heating rod, 143 heat storage material layer, 150 circulating fan. DETAILED DESCRIPTION

[0039] The present application will be further described below in conjunction with the drawings and specific embodiments. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation of the present application. The specific structural and functional details disclosed herein are only used to describe the example embodiments of the present application. However, the present application can be embodied in many alternative forms, and should not be understood as limited in the embodiments set forth herein.

[0040] As Figure 1 shown, according to an embodiment of the present disclosure, a solid heat storage based heating system 100 is provided, comprising:

[0041] The solid heat storage module 110 is heated by electricity; the heat network structure 120 is internally provided with a liquid channel, the liquid channel is formed with an inlet end and an outlet end, the inlet end is used for inputting heat supply return water, and the outlet end is used for outputting heat supply hot water; the heat preservation tank 130 is formed with an input end and an output end, the output end is connected to the inlet end through a first valve body, the input end is connected to the outlet end through a second valve body, and the heat preservation tank 130 is used for storing the liquid output by the heat network structure 120; wherein, when the solid heat storage module 110 is heated to a first preset temperature, the gas is heated to form high-temperature gas through the solid heat storage module 110, and the heat network structure 120 is heated to output the heat supply hot water from the outlet end and / or store the heat supply hot water in the heat preservation tank 130; when the solid heat storage module 110 stops heating and the temperature of the solid heat storage module 110 is lower than a second preset temperature, the first valve body is opened, and the heat network structure 120 is heated by the high-temperature liquid stored in the heat preservation tank 130; wherein, the first preset temperature is higher than the second preset temperature.

[0042] It can be understood that the solid heat storage based heating system 100 provided by the embodiments of the present disclosure is provided with a solid heat storage module 110, a heat network structure 120 and a heat preservation tank 130. The solid heat storage module 110 can be heated by electric heating and store heat energy. The heat network structure 120 can be provided with a liquid channel, and the liquid channel is formed with an inlet end and an outlet end. The heating return water can be transported into the liquid channel through the inlet end, and the liquid in the heat network structure 120 can exchange heat with the gas heated by the solid heat storage module 110 to increase the temperature of the liquid, and then the heating hot water can be output through the outlet end. The heat preservation tank 130 is provided with an input end and an output end. The output end is connected to the inlet end through a first valve body, and the input end can be connected to the outlet end through a second valve body. By controlling the opening and closing of the first valve body and the second valve body, the liquid output by the heat network structure 120 can be stored in the heat preservation tank 130, or the stored liquid can be output to the heat network structure 120. In this way, in the case of using cheap valley electricity and / or new energy electricity during the power generation period at night, the solid heat storage module 110 is heated by electric heating, and when the solid heat storage module 110 is heated to a first preset temperature, the gas can be heated by the solid heat storage module 110 to form high-temperature gas, and the high-temperature gas flows to the heat network structure 120 to exchange heat with the liquid in the liquid channel to heat the liquid to form heating hot water, so that the heating hot water can be output from the outlet end for heating, and part of the heating hot water can be stored in the heat preservation tank 130 by opening the second valve body. In other power consumption periods, the solid heat storage module 110 stops heating and releases the stored heat energy to heat the gas to form high-temperature gas, and the high-temperature gas flows to the heat network structure 120 to exchange heat with the liquid in the liquid channel to heat the liquid to form heating hot water, so that the heating hot water can be output from the outlet end for heating, and part of the heating hot water can be stored in the heat preservation tank 130 by opening the second valve body. As the heat energy stored in the solid heat storage module 110 is consumed, when the temperature of the solid heat storage module 110 is lower than a second preset temperature, the heat energy provided by the solid heat storage module 110 is lower, which results in a lower temperature of the heated gas. By opening the first valve body, the high-temperature liquid stored in the heat preservation tank 130 can be transported to the heat network structure 120 to heat the liquid in the liquid channel, and the heating effect of the gas can be combined to ensure that the heat network structure 120 can continuously and stably provide heating hot water. Thus, the emission of coal combustion pollutants can be reduced, the heating cost can be reduced, long-term uninterrupted heating can be realized, and the heating effect can be ensured.

[0043] It can be understood that the temperature of the heating return water can be 40-50℃, and the high-temperature gas heated by the solid heating module can heat the heating return water to 85-95℃. Part of the heating return water is output as heating hot water, and the other part is stored in the heat preservation tank 130.

[0044] Exemplarily, the heat network structure 120 can be a serpentine heat network pipe structure to increase the heat exchange area with the gas and improve the heat exchange efficiency.

[0045] In some examples, when the solid heat storage module 110 stops heating and the temperature is between the first preset temperature and the second preset temperature, the solid heat storage module 110 releases the stored heat energy to heat the gas to a high-temperature gas, supplies heat to the heat network structure 120 by the high-temperature gas, and outputs the heat supply hot water from the liquid outlet and / or stores the heat supply hot water in the heat preservation tank 130.

[0046] It can be understood that after the power supply is stopped and the solid heat storage module 110 stops heating, the solid heat storage module 110 releases the stored heat energy, and the temperature of the solid heat storage module 110 continues to decrease. During the process that the temperature of the solid heat storage module 110 decreases to between the first preset temperature and the second preset temperature, the solid heat storage module 110 still has a relatively high temperature to heat the gas to a high-temperature gas and supply heat to the heat network structure 120 by the high-temperature gas, thereby heating the heat supply return water to the heat supply hot water, outputting the heat supply hot water, and storing part of the heat supply hot water in the heat preservation tank 130.

[0047] It can be understood that the second preset temperature can be 490°C. When the power supply is supplied and the solid heat storage module 110 heats up, when the temperature exceeds 490°C, the second valve body can be opened to transport the heat supply hot water after heat exchange in the heat network structure 120 to the heat preservation tank 130 for storage. When the power supply is stopped and the solid heat storage module 110 releases heat to decrease the temperature, when the temperature is lower than 490°C, the first valve body can be opened to release heat energy by the heat supply hot water in the heat preservation tank 130 to heat the heat supply return water in the heat network structure 120.

[0048] In some examples, the gas is flue gas after dust removal of a boiler, the temperature of the flue gas is 120°C to 150°C, and the temperature of the flue gas after heating by the solid heat storage module 110 reaches 180°C to 800°C; or the gas is air after heat exchange with the heat network structure 120, the temperature of the air is 50°C to 60°C, and the temperature of the air after heating by the solid heat storage module 110 reaches 180°C to 800°C.

[0049] Understandably, the gas can be flue gas from a conventional thermal power plant boiler after dust removal. After filtration, the waste heat of the flue gas can be used to reduce energy consumption. The flue gas temperature can be 120℃ to 150℃. After being heated by the solid thermal storage module 110, the temperature can reach 180℃ to 800℃, forming a high-temperature gas that can exchange heat with the heating and return water within the heat network structure 120, ensuring heat exchange efficiency. Alternatively, air can be used, which is readily available and low in cost. The initial temperature of air can be 50℃ to 60℃. After being heated by the solid thermal storage module 110, the temperature can reach 180℃ to 800℃, forming a high-temperature gas that can also exchange heat with the heating and return water within the heat network structure 120, ensuring heat exchange efficiency.

[0050] It is understandable that, in the case of flue gas, such as Figure 1 As shown, the arrows indicate the direction of flue gas flow. After heat exchange, the flue gas temperature drops to 50°C to 60°C and is then sent to the inlet of the boiler induced draft fan. In the case of air, as... Figure 2 As shown, the arrows indicate the direction of air flow. After heat exchange, the air temperature drops to 50°C to 60°C and can be sent to the solid heat storage module 110 by the circulating fan 150 to continue being heated by the solid heat storage module 110.

[0051] For example, the solid thermal storage module 110 can have an electric heating power of 13,500W, which can heat flue gas with a flow rate of 26t / h to 140t / h and a temperature of 140°C, or air with a temperature of 55°C, to a high temperature of 193°C to 772°C, so as to heat the 42°C supply return water in the heating network structure 120 to 90°C. The thermal storage time can be 8 hours, and the heating time can be 24 hours, realizing 24-hour uninterrupted heating. The heating area can be 120,000 m². 2 Up to 140,000 m 2 .

[0052] In some examples, the aforementioned insulated tank 130 is a thermocline hot water storage tank.

[0053] It is understandable that the insulated tank 130 can be a thermocline hot water storage tank. The thermocline hot water storage tank can utilize the large temperature difference in the thermocline to achieve a high energy conversion efficiency. Moreover, the temperature change in the thermocline is small, which is conducive to long-term stable operation. Furthermore, water is a renewable resource, which has a smaller impact on the environment and meets the requirements of sustainable development.

[0054] In some examples, such as Figure 1 As shown, the solid thermal energy storage module 110 includes: a plurality of solid thermal energy storage units 140, each of which is cylindrical in shape, with the middle portion of the cylindrical structure used for the passage of the gas; and a support frame on which the plurality of solid thermal energy storage units 140 are disposed.

[0055] It can be understood that the solid heat storage module 110 can be provided with a plurality of solid heat storage units 140 and support frames. Each of the solid heat storage units 140 can independently store heat, and the plurality of solid heat storage units 140 are fixed and supported by the support frames to form the solid heat storage module 110. The solid heat storage unit 140 can have a cylindrical structure, and the middle part of the cylindrical structure can pass through the gas. During the passing of the gas through the cylindrical structure, the gas can be heated by the solid heat storage unit 140 to form high-temperature gas.

[0056] In some examples, the solid heat storage module 110 further includes a limiting piece arranged between the gaps of adjacent solid heat storage units 140, for limiting the solid heat storage units 140, and the limiting piece is used to block the flow of the gas.

[0057] It can be understood that the solid heat storage module 110 can also be provided with a limiting piece, which can be arranged between the gaps of each adjacent solid heat storage unit 140, to support and limit the solid heat storage unit 140 by the limiting piece, thereby improving the stability of the solid heat storage module 110, and when the gas flows to the limiting piece, it will be blocked by the limiting piece and flow out through the middle part of the cylindrical structure, so as to ensure that most of the gas is heated by the solid heat storage unit 140, thereby improving the heating efficiency and heating effect.

[0058] In some examples, the number of solid heat storage units 140 is 1000 to 2000, and the solid heat storage module 110 formed by a plurality of solid heat storage units 140 has a cubic structure.

[0059] It can be understood that the number of solid heat storage units 140 can be 1000 to 2000, and the solid heat storage module 110 as a whole has a cubic structure under the action of the support frame and the limiting piece, so as to have better stability.

[0060] For example, the number of solid heat storage units 140 can be 1245, and the volume of the solid heat storage module 110 formed thereby can be 150m 3 .

[0061] In some examples, as shown in Figure 2 The solid heat storage unit 140 includes a pipe body 141, an electric heating rod 142 arranged in the pipe body 141, and a heat storage material layer 143 sleeved on the pipe body 141.

[0062] It can be understood that the solid heat storage unit 140 can be provided with a pipe body 141, an electric heating rod 142 and a heat storage material layer 143. The pipe body 141 is in a cylindrical shape, and the heat storage material layer 143 is arranged on the circumferential side of the pipe body 141 and is also in a cylindrical shape. The electric heating rod 142 can be arranged in the pipe body 141. In this way, by supplying power to the electric heating rod 142 to generate heat, the electric heating rod 142 radiates heat to the pipe body 141, and then the heat energy is stored through the heat storage material layer 143.

[0063] Exemplarily, the diameter of the electric heating rod 142 can be 25 mm, and the heat storage material of the heat storage material layer 143 can be selected from silicon carbide. The length of each solid heat storage unit 140 is 8 m to 12 m.

[0064] In some examples, the thickness of the heat storage material of the heat storage material layer 143 is 30 to 50 mm; and the thermal conductivity of the heat storage material is 40 to 80 W / (m·K).

[0065] It can be understood that the thickness of the heat storage material of the heat storage material layer 143 can be selected from 30 mm to 50 mm; and the thermal conductivity of the heat storage material can be selected from 40 W / (m·K) to 80 W / (m·K), so as to ensure the heat storage effect of the solid heat storage unit 140.

[0066] In some examples, the wall thickness of the pipe body 141 is 2 to 5 mm; the inner diameter of the pipe body 141 is 50 to 70 mm; and the pipe body 141 includes a 20G pipe body 141, a 15CrMo pipe body 141 and a stainless steel pipe body 141.

[0067] It can be understood that the wall thickness of the pipe body 141 can be selected from 2 mm to 5 mm, and the inner diameter of the pipe body 141 is 50 mm to 70 mm, and the pipe body 141 includes a 20G pipe body 141, a 15CrMo pipe body 141 and a stainless steel pipe body 141, so as to ensure that the pipe body 141 has good structural strength and heat conduction effect.

[0068] It should be understood that the terms first, second, etc. are only used to distinguish description, and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. can be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit can be called the second unit, and similarly the second unit can be called the first unit, without departing from the scope of the example embodiments of the present application.

[0069] It should be understood that the term "and / or" in this text merely describes an association relationship of associated objects, which means that three relationships can exist, for example, A and / or B can mean that A exists alone, B exists alone, and A and B exist together. The term " / and" in this text describes another association relationship of associated objects, which means that two relationships can exist, for example, A / and B can mean that A exists alone and A and B exist together. In addition, the character " / " in this text generally indicates that the associated objects before and after the character " / " are in an "or" relationship.

[0070] It should be understood that in the description of the present application, the terms "upper", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship when the disclosed product is usually placed, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0071] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0072] The terms used herein are used only to describe specific embodiments and are not intended to limit example embodiments of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprise", "comprises", "include", and / or "includes" when used in this text specify the existence of the declared features, integers, steps, operations, units and / or components, and do not exclude the existence or addition of one or more other features, quantities, steps, operations, units, components and / or combinations thereof.

[0073] In the following description, specific details are provided to facilitate a full understanding of example embodiments. However, those skilled in the art will understand that example embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures and techniques can not be shown in unnecessary detail in order to avoid obscuring example embodiments.

[0074] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0075] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A heat supply system based on solid heat storage, characterized in that, The system comprises: a solid heat storage module, which is heated by electricity; a heat network structure, which is internally provided with a liquid channel, the liquid channel is formed with an inlet end and an outlet end, the inlet end is used for inputting heat supply return water, and the outlet end is used for outputting heat supply hot water; a heat preservation tank, which is formed with an input end and an output end, the output end is connected to the inlet end through a first valve body, and the input end is connected to the outlet end through a second valve body, and the heat preservation tank is used for storing the liquid output by the heat network structure; wherein, when the solid heat storage module is heated to a first preset temperature, the gas is heated by the solid heat storage module to form high-temperature gas, and the heat network structure is heated by the high-temperature gas to output the heat supply hot water from the outlet end and / or store the heat supply hot water in the heat preservation tank; when the solid heat storage module stops heating and the temperature of the solid heat storage module is lower than a second preset temperature, the first valve body is opened, and the heat network structure is heated by the high-temperature liquid stored in the heat preservation tank. The first preset temperature is higher than the second preset temperature.

2. The solid heat storage-based heating system according to claim 1, wherein when the solid heat storage module stops heating and the temperature is between the first preset temperature and the second preset temperature, the solid heat storage module releases the stored heat energy to heat the gas to high-temperature gas, and the heat network structure is heated by the high-temperature gas to output the heat supply hot water from the outlet end and / or store the heat supply hot water in the heat preservation tank.

3. The solid heat storage-based heating system according to claim 1, wherein the gas is flue gas after dust removal of a boiler, the temperature of the flue gas is 120-150°C, and the temperature of the flue gas after heating by the solid heat storage module reaches 180-800°C; or the gas is air after heat exchange with the heat network structure, the temperature of the air is 50-60°C, and the temperature of the air after heating by the solid heat storage module reaches 180-800°C.

4. The solid heat storage-based heating system according to claim 1, wherein the heat preservation tank is a thermal stratification storage water tank. The solid heat storage module comprises: a plurality of solid heat storage units, which are in a cylindrical structure as a whole, and the middle part of the cylindrical structure is used for passing the gas; a support frame, in which the plurality of solid heat storage units are arranged. The solid heat storage module further comprises:

5. The solid heat storage based heating system as claimed in claim 4, wherein, a limiting piece arranged between the gaps of adjacent solid heat storage units, which is used for limiting the solid heat storage units and blocking the flow of the gas. The number of the solid heat storage units is 1000-2000, and the solid heat storage module composed of the plurality of solid heat storage units is in a cubic structure as a whole. The solid heat storage unit comprises:

6. The solid heat storage based heating system as claimed in claim 5, wherein, a pipe body; an electric heating rod arranged in the pipe body; 7. The solid heat storage based heating system as claimed in claim 6, wherein, a heat storage material layer sleeved on the pipe body.

8. The solid heat storage based heating system as claimed in claim 7, wherein, 9. The solid heat storage-based heating system according to claim 8, wherein ​ ​ ​ ​ The heat storage material layer has a heat storage material thickness of 30-50 mm; The heat storage material has a thermal conductivity in the range of 40-80 W / (m·K).

10. The solid heat storage-based heating system according to claim 9, characterized in that, The wall thickness of the pipe body is 2-5 mm; The inner diameter of the pipe body is 50-70 mm; The pipe body comprises a 20G pipe body, a 15CrMo pipe body and a stainless steel pipe body.

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