Vehicle-mounted steel movable heat storage system and heat storage and release method

Abstract

The invention relates to the technical field of heat storage, in particular to a vehicle-mounted steel movable heat storage system and a heat storage and release method. The system comprises a heat storage device, a peak shaving heating module and a heat transfer module, the heat storage device comprises a movable vehicle body and a heat exchange assembly, the heat exchange assembly comprises multiple layers of steel heat storage units arranged in a stacked mode and a water supply heat exchange pipeline spirally arranged along multiple layers of air channels, one end of the water supply heat exchange pipeline is a heat supply network water supply end, and the other end of the water supply heat exchange pipeline is a heat supply network steam end. The peak shaving heating module is used for introducing electric peak shaving and / or energy storage peak shaving to heat the steel heat storage unit, and the heat transfer module is used for generating circulating air and achieving heat transfer between a medium in the water heat exchange pipeline and the steel heat storage unit. Low-cost and high-benefit steel heat storage and energy storage can be achieved, and the method has practical significance in peak regulation and frequency modulation of a thermal power plant or a new energy power plant or peak regulation and frequency modulation of a power grid load side.

Description

Technical Field

[0001] The present invention relates to the technical field of heat storage, in particular to a vehicle-mounted steel mobile heat storage system and a heat storage and release method. Background Art

[0002] Heat storage technologies are generally divided into thermophysical heat storage and thermochemical heat storage. Thermophysical heat storage includes two heat storage principles: sensible heat and latent heat. Among them, sensible heat storage uses the temperature rise of high specific heat capacity materials to store heat, with an energy storage density of 30 - 80 kWh / m3. Its storage method is simple and the energy storage cost is low, but there are problems such as too large system volume and serious heat loss; latent heat storage uses the phase change of materials to store heat, with an energy storage density of 83 - 140 kWh / m3. The temperature is stable during the phase change process, but there are problems such as easy aging of materials, strong corrosiveness of some materials, and large heat loss.

[0003] Currently, the commonly used heat storage methods in engineering include solid heat storage (sensible heat), water heat storage (sensible heat), and phase change heat storage (latent heat + sensible heat), etc. Among them, the lowest cost is water heat storage, the medium-cost area is solid heat storage, and the higher cost is phase change heat storage. However, although water heat storage has the lowest cost, its energy storage density is low and the temperature is limited, making it difficult to efficiently respond to the rapid frequency regulation requirements of the power grid; solid heat storage usually uses concrete, rocks, etc., and its heat storage temperature is low, making it difficult to meet the requirements of high-temperature industrial waste heat or high-parameter power grid peak shaving; phase change heat storage is costly and difficult to be widely promoted for power grid auxiliary services. Therefore, the existing heat storage technologies have bottlenecks in the low density and low temperature of water / solid heat storage, as well as the high cost and low reliability of phase change materials, and it is difficult to meet the requirements of the power grid peak shaving and frequency regulation for high economy, high response speed, high-temperature adaptability, and mobile flexibility. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a vehicle-mounted steel mobile heat storage system and a heat storage and release method to solve the problem that the existing heat storage methods are difficult to meet the requirements of the power grid peak shaving and frequency regulation for high economy, high response speed, high-temperature adaptability, and mobile flexibility.

[0005] The present invention discloses a vehicle-mounted steel mobile heat storage system, including: A heat storage device, including a mobile vehicle body, and a heat exchange component arranged on the mobile vehicle body. The heat exchange component includes a steel heat storage unit and a feed water heat exchange pipeline. A plurality of the steel heat storage units are arranged in a stacked manner, and an air channel is formed between adjacent layers of the steel heat storage units. The feed water heat exchange pipeline is spirally arranged along multiple layers of the air channels, and one end of the feed water heat exchange pipeline is a heat network feed water end, and the other end of the feed water heat exchange pipeline is a heat network steam end; The peak shaving heating module, which is connected to the steel heat storage unit, is used to electrically heat the steel heat storage unit by linking the surplus power generated on the power peak shaving side; and / or, The peak shaving heating module is docked with the feed water heat exchange pipeline, and is used to heat the steel heat storage unit by heat exchange by linking the steam or flue gas generated on the energy storage peak shaving side; The heat transfer module includes a circulation fan. One side of the steel heat storage unit forms an air inlet side communicating with multiple layers of the air channels, and the other side of the steel heat storage unit forms an air outlet side communicating with multiple layers of the air channels. The air outlet side of the steel heat storage unit is connected to the air inlet of the circulation fan, and the air inlet side of the steel heat storage unit is connected to the air outlet of the circulation fan.

[0006] Optionally, a container body is provided on the mobile vehicle body. Both the heat exchange component and the heat transfer module are arranged in the container body, and the steel heat storage unit or the feed water heat exchange pipeline is connected to the peak shaving heating module in the area where the mobile vehicle body is located.

[0007] Optionally, a heat preservation layer is provided on the inner wall of the container body.

[0008] Optionally, a fixing component is arranged in the container body. The fixing component includes an air outlet plate arranged on the air outlet side of the steel heat storage unit and an air inlet plate arranged on the air inlet side of the steel heat storage unit. One end of the steel heat storage unit is connected to the air outlet plate, and the other end of the steel heat storage unit is connected to the air inlet plate. Among them, an air channel is also formed between the lowermost steel heat storage unit and the bottom wall of the container body.

[0009] Optionally, a partition plate is arranged above the uppermost steel heat storage unit, and the air outlet plate, the air inlet plate, the partition plate and the wall of the container body enclose a closed heat exchange chamber; The air outlet plate is provided with air outlets corresponding to and communicating with the air channels one by one. Between the air outlet plate and the side wall of the container body, a first lower air duct connected to the air inlet of the circulation fan is formed. Between the partition plate and the top wall of the container body, an upper air duct connected to the air outlet of the circulation fan is formed. The air inlet plate is provided with air inlets corresponding to and communicating with the air channels one by one. Between the air inlet plate and the wall of the container body, a second lower air duct communicating with the upper air duct is formed.

[0010] Optionally, the heat transfer module further includes a driving motor. The driving motor is arranged on the side wall of the container body. The circulation fan is located at the connection position of the first lower air duct and the upper air duct, and the power input end of the circulation fan is connected to the output end of the driving motor.

[0011] Optionally, the steel heat storage unit includes a heat storage steel plate and a plurality of heat storage steel bars supported below the heat storage steel plate. The plurality of heat storage steel bars are arranged side by side, and connectors are provided on the air outlet plate and the air inlet plate. Two ends of the heat storage steel bars are respectively connected to the air outlet plate and the air inlet plate, and the end of the heat storage steel bar is connected to the air outlet plate or the air inlet plate in a displacement compensation manner.

[0012] Optionally, a heat exchange gap is formed between adjacent heat storage steel bars; The feed water heat exchange pipe is arranged in a continuous S-shaped structure along a plurality of side-by-side heat exchange gaps in each layer of the air channel; or, A plurality of feed water heat exchange pipes spirally arranged along multiple layers of the air channels are arranged side by side, and one feed water heat exchange pipe is correspondingly arranged in each of the side-by-side heat exchange gaps.

[0013] Optionally, an electric heater is provided on the steel heat storage unit, and the power output end of the peak shaving heating module is electrically connected to the electric heater; and / or, The steam or flue gas output end of the peak shaving heating module is connected to the heat network steam end of the feed water heat exchange pipe, and the feed water return end of the peak shaving heating module is connected to the heat network feed water end of the feed water heat exchange pipe.

[0014] The present invention also discloses a heat storage and release method, which adopts the above-mentioned vehicle-mounted steel mobile heat storage system. The heat storage and release method includes: In response to the surplus power generated on the power peak shaving side of the peak shaving heating module, controlling the surplus power generated on the power peak shaving side to supply power and electrically heating the steel heat storage unit, and dynamically adjusting the power of the power supply according to the heat consumption demand of heat network users; and / or, In response to the steam or flue gas generated on the energy storage peak shaving side of the peak shaving heating module, controlling the steam or flue gas generated on the energy storage peak shaving side to enter the feed water heat exchange pipe, and controlling the circulation fan to drive external air to flow through the feed water heat exchange pipe to absorb heat and increase the temperature. The heated air continues to flow and convectively transfers heat to the steel heat storage unit, and dynamically adjusts the power of the steam or flue gas input according to the heat consumption demand of heat network users; In response to the heat consumption demand of heat network users, switching to control the heat network feed water to enter the feed water heat exchange pipe, and controlling the circulation fan to drive external air to flow through the steel heat storage unit to absorb heat and increase the temperature. The heated air continues to flow and convectively transfers heat to the feed water in the feed water heat exchange pipe until the heat network feed water is heated to superheated steam and circulates back to heat network users.

[0015] Compared with the prior art, the beneficial effects of the vehicle-mounted steel mobile heat storage system and the heat storage and release method provided by the embodiments of the present invention are as follows: By setting up a mobile vehicle body, a steel heat storage unit and a feed water heat exchange pipeline located on the mobile vehicle body, in the form of on-vehicle steel, on the one hand, steel has a high heat storage temperature and does not require high-pressure containers, which can meet the needs of high-temperature scenarios; on the other hand, as a low-cost and reusable industrial material, combined with the mobile vehicle body, it can be quickly deployed to the demand sites, such as thermal power plants, new energy power plants or power grid nodes, improving the response speed and flexibility and reducing the unit energy storage cost. At the same time, by combining the heat storage device with the peak shaving heating module, the on-vehicle steel mobile heat storage system can directly receive the peak shaving signals from the power supply side, thermal power unit side, load side or energy storage station of the nearby power grid, and through the seamless connection of electric heating and steam or flue gas heating, realize the fast charge / discharge scheduling of stable switching of multiple heat sources, so as to decouple the electric energy production and heat energy supply, achieve low-cost and high-benefit steel heat storage energy storage, which has practical significance for peak shaving and frequency modulation of thermal power plants or new energy power plants or peak shaving and frequency modulation of the power grid load side. Description of the Drawings

[0016] The technical solutions of the present invention will be further described in detail below in conjunction with the drawings and embodiments. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the on-vehicle steel mobile heat storage system provided by the embodiment of the present invention; Figure 2 It is a schematic diagram of the arrangement structure of the steel heat storage unit and the feed water heat exchange pipeline provided by the embodiment of the present invention; Figure 3 It is a schematic diagram of the assembly structure of the heat storage steel plate and the heat storage steel bar provided by the embodiment of the present invention; Figure 4 It is a schematic diagram of the arrangement structure of the feed water heat exchange pipeline provided by the embodiment of the present invention.

[0017] 1. Mobile vehicle body; 2. Steel heat storage unit; 21. Heat storage steel plate; 22. Heat storage steel bar; 3. Feed water heat exchange pipeline; 31. Heat network feed water end; 32. Heat network steam end; 4. Circulation fan; 5. Container body; 51. Thermal insulation layer; 52. Air outlet plate; 53. Air inlet plate; 54. Partition plate; 55. First lower air duct; 56. Upper air duct; 57. Second lower air duct; 6. Driving motor. Detailed Embodiments

[0018] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Now, in conjunction with the drawings, the preferred embodiments of the present invention will be described in detail.

[0019] The present invention discloses an on-vehicle steel mobile heat storage system, as Figure 1 shown, including: Thermal energy storage device, comprising a mobile vehicle body 1 and a heat exchange component arranged on the mobile vehicle body 1. The heat exchange component includes a steel thermal energy storage unit 2 and a feed water heat exchange pipeline 3. A plurality of steel thermal energy storage units 2 are arranged in a stacked manner, and an air channel is formed between adjacent layers of steel thermal energy storage units 2. The feed water heat exchange pipeline 3 is spirally arranged along the multi-layer air channels, and one end of the feed water heat exchange pipeline 3 is the heat network feed water end 31, and the other end of the feed water heat exchange pipeline 3 is the heat network steam end 32; Peak shaving heating module, connected to the steel thermal energy storage unit 2, for electrically heating the steel thermal energy storage unit 2 by linking the surplus power generated on the power peak shaving side; and / or, The peak shaving heating module is docked with the feed water heat exchange pipeline 3, for heat exchange heating the steel thermal energy storage unit 2 by linking the steam or flue gas generated on the energy storage peak shaving side; Heat transfer module, including a circulation fan 4. One side of the steel thermal energy storage unit 2 forms an air inlet side communicating with the multi-layer air channels, and the other side of the steel thermal energy storage unit 2 forms an air outlet side communicating with the multi-layer air channels. The air outlet side of the steel thermal energy storage unit 2 is connected to the air inlet of the circulation fan 4, and the air inlet side of the steel thermal energy storage unit 2 is connected to the air outlet of the circulation fan 4.

[0020] Through the implementation of the above embodiments of the on-vehicle steel mobile thermal energy storage system, the mobile vehicle body 1 and the steel thermal energy storage unit 2 and the feed water heat exchange pipeline 3 located on the mobile vehicle body 1 are provided. In the form of on-vehicle steel, on the one hand, steel has a high heat storage temperature and does not require high-pressure containers, and can meet the requirements of high-temperature scenarios; on the other hand, as a low-cost and reusable industrial material, combined with the mobile vehicle body 1, it can be quickly deployed to the demand location, such as a thermal power plant, a new energy power plant or a power grid node, improving the response speed and flexibility and reducing the unit energy storage cost. At the same time, by combining the thermal energy storage device with the peak shaving heating module, the on-vehicle steel mobile thermal energy storage system can directly receive the peak shaving signals from the nearby power grid power supply side, thermal power unit side, load side or energy storage station, and through the seamless connection of electric heating and steam or flue gas heating, realize the fast charge / discharge scheduling of stable switching of multiple heat sources, so as to decouple the electric energy production and heat energy supply, realize low-cost and high-efficiency steel thermal energy storage, and has practical significance for the peak shaving and frequency modulation of thermal power plants or new energy power plants or the peak shaving and frequency modulation of the power grid load side.

[0021] As described above, the power peak shaving side preferably uses the surplus power of the power grid, new energy power station or thermal power unit for peak shaving and frequency modulation to supply power, and then directly electrically heats the steel heat storage unit 2. The energy storage peak shaving side preferably uses any one of the steam heat sources of the steam boiler or the steam extraction of the steam turbine of the thermal power unit to enter the feed water heat exchange pipeline 3 to exchange heat with the circulating air, and then performs a steam heating process of convective heat transfer on the steel heat storage unit 2, or uses any one of the high-temperature flue gas heat sources of the coal-fired boiler, pulverized coal-fired power station boiler, gas boiler, or gas turbine to enter the feed water heat exchange pipeline 3 to exchange heat with the circulating air, and then performs a flue gas heating process of convective heat transfer on the steel heat storage unit 2. Thus, by using the specially designed steam, flue gas or electric heating of the steel heat storage unit 2, high-efficiency heat storage can be achieved, with high heat storage efficiency, high heat storage temperature, and higher safety than the existing molten salt mobile heat storage.

[0022] When the heat network user has a heat demand, after the heat storage of the steel heat storage unit 2 is completed, only the heat network feed water needs to be introduced into the feed water heat exchange pipeline 3, and the circulating fan 4 is used to drive the external air to flow through the steel heat storage unit 2 to absorb heat and increase the temperature. The heated air continues to flow and convectively transfers the heat to the feed water in the feed water heat exchange pipeline 3. At the same time, the waste heat of the steel heat storage unit 2 will also increase the temperature of the feed water in the feed water heat exchange pipeline 3 through thermal radiation, so that the heat network feed water generates hot water or industrial steam for external heating under the combined heating of the hot air and the steel heat storage unit 2. Combined with the rapid deployment of the mobile vehicle body 1, it is possible to achieve long-distance heating without the need to build expensive heating pipelines or industrial steam pipelines, which is of great significance for increasing the heating income of thermal power units in the north or south. In addition, independent air channels are formed between the steel heat storage units 2 of adjacent layers to force the feed water to flow in a pre-coiled path in the feed water heat exchange pipeline 3 to increase the heat exchange path of the feed water and ensure that the feed water is heated into superheated steam.

[0023] Furthermore, a container body 5 is provided on the mobile vehicle body 1, and the heat exchange assembly and the heat transfer module are both arranged in the container body 5, and the steel heat storage unit 2 or the feed water heat exchange pipeline 3 is connected to the peak shaving heating module in the area where the mobile vehicle body 1 is located.

[0024] Furthermore, a heat preservation layer 51 is provided on the inner wall of the container body 5.

[0025] Through the implementation of the above-described embodiments of the on-vehicle steel moving heat storage system, by means of the setting of the container body 5, protection can be provided against rain, dust, and mechanical impacts, ensuring that the internal heat exchange components and heat transfer modules can still operate stably in harsh industrial environments. The thermal insulation layer 51 is preferably a thermal insulation material with sound insulation function (noise reduction ≥ 15 dB), such as rock wool, polyurethane foam, etc., which can significantly reduce heat dissipation, minimize the heat exchange between the steel heat storage unit 2 and the external environment, thereby improving the system thermal efficiency, maintaining the temperature stability of the steel heat storage unit 2, avoiding energy waste caused by frequent heat replenishment, and thus being applicable to the long-term heat storage requirements of the on-vehicle steel moving heat storage system during transportation or standby.

[0026] Furthermore, a fixing component is arranged inside the container body 5. The fixing component includes an air outlet plate 52 arranged on the air outlet side of the steel heat storage unit 2, and an air inlet plate 53 arranged on the air inlet side of the steel heat storage unit 2. One end of the steel heat storage unit 2 is connected to the air outlet plate 52, and the other end of the steel heat storage unit 2 is connected to the air inlet plate 53. Among them, an air channel is also formed between the bottommost steel heat storage unit 2 and the bottom box wall of the container body 5.

[0027] Furthermore, a partition plate 54 is arranged above the uppermost steel heat storage unit 2, and the air outlet plate 52, the air inlet plate 53, the partition plate 54, and the box wall of the container body 5 enclose a closed heat exchange chamber; The air outlet plate 52 is provided with air outlets corresponding to and communicating with the air channels one by one. Between the air outlet plate 52 and the side box wall of the container body 5, a first lower air duct 55 connected to the air inlet of the circulation fan 4 is formed. Between the partition plate 54 and the top box wall of the container body 5, an upper air duct 56 connected to the air outlet of the circulation fan 4 is formed. The air inlet plate 53 is provided with air inlets corresponding to and communicating with the air channels one by one. Between the air inlet plate 53 and the box wall of the container body 5, a second lower air duct 57 communicating with the upper air duct 56 is formed.

[0028] Through the implementation of the above-mentioned embodiments of the on-vehicle steel moving heat storage system, by setting the air inlet plate 53 and the air outlet plate 52, both ends of the steel heat storage unit 2 can be fixed, avoiding displacement and deformation of each layer of the steel heat storage unit 2 caused by transportation or vibration. Preferably, each layer of the steel heat storage unit 2 can be independently disassembled to support the maintenance and replacement of a single layer of the steel heat storage unit 2 without the need for overall shutdown. At the same time, by using the holes on the air inlet plate 53 and the air outlet plate 52, it is ensured that the circulating air driven by the circulating fan 4 enters each layer of the steel heat storage unit 2 through the air inlet plate 53 for heat exchange and then flows out from the air outlet plate 52, so as to form an air flow path composed of the upper air duct 56, the second lower air duct 57, multiple layers of the steel heat storage unit 2, and the first lower air duct 55, thereby matching the axial temperature distribution of the multiple layers of the steel heat storage unit 2 and avoiding heat "backflow". Moreover, the holes on the air inlet plate 53 and the air outlet plate 52 are strictly aligned with the air channels of each layer to eliminate local eddy currents or dead zones, improving the surface heat transfer coefficient of the steel heat storage unit 2. In addition, the heat exchange chamber formed by the air outlet plate 52, the air inlet plate 53, the partition plate 54, and the box wall can block the direct contact between the internal steel heat storage unit 2 and the external environment. Combined with the box heat insulation layer 51, it further avoids the heat loss of the steel heat storage unit 2, thereby improving its heat storage efficiency. Preferably, the air outlet plate 52 can also be used to fix the water supply heat exchange pipeline 3.

[0029] Furthermore, the heat transfer module further includes a driving motor 6. The driving motor 6 is arranged on the side wall of the container body 5. The circulating fan 4 is located at the connection position between the first lower air duct 55 and the upper air duct 56, and the power input end of the circulating fan 4 is connected to the output end of the driving motor 6.

[0030] Furthermore, as shown in Figures 2 - 4 the steel heat storage unit 2 includes a heat storage steel plate 21 and a plurality of heat storage steel bars 22 supported below the heat storage steel plate 21. The plurality of heat storage steel bars 22 are arranged side by side, and connectors are provided on the air outlet plate 52 and the air inlet plate 53. Both ends of the heat storage steel bars 22 are respectively connected to the air outlet plate 52 and the air inlet plate 53, and the ends of the heat storage steel bars 22 are connected to the air outlet plate 52 or the air inlet plate 53 in a displacement compensation manner.

[0031] Through the implementation of the above embodiments of the on-vehicle steel moving heat storage system, the steel heat storage unit 2 composed of the heat storage steel plate 21 and several heat storage steel bars 22 is utilized. With the heat storage steel plate 21 as the main heat storage medium, it can provide a high specific heat capacity and a radiation heat exchange area. The juxtaposed heat storage steel bars 22 serve as a support framework to disperse the gravity load of the heat storage steel plate 21, prevent the heat storage steel plate 21 from softening and collapsing at high temperatures, and at the same time serve as a heat storage medium. Thus, it not only improves the compressive strength of the entire steel heat storage unit 2 but also increases the heat storage capacity of the entire steel heat storage unit 2. In addition, the ends of the heat storage steel bars 22 and the air outlet plate 52 or the air inlet plate 53 are preferably connected by conventional loose clamping connection methods such as sliding hinges or elastic buckles to allow the steel bars to freely expand and contract axially during thermal expansion and contraction, avoid internal stress concentration caused by temperature cycling, thereby reducing the risk of steel fatigue fracture and enhancing the service life. That is, through the composite structure of "steel heat storage + steel bar support + displacement compensation", the core advantages of high heat storage density, thermal stress resistance, rapid heat exchange, and easy maintenance are realized, which is especially suitable for harsh scenarios with high temperature, high vibration, and frequent peak shaving, and solves the problems of short service life, low efficiency, and difficult maintenance of traditional heat storage bodies.

[0032] Further, a heat exchange gap is formed between adjacent heat storage steel bars 22; The feed water heat exchange pipe 3 is located in the air channels of each layer and is in a continuous S-shaped structure along a plurality of juxtaposed heat exchange gaps; or, A plurality of feed water heat exchange pipes 3 are arranged side by side and spirally arranged along the multi-layer air channels, and one feed water heat exchange pipe 3 is correspondingly arranged in each of the juxtaposed heat exchange gaps.

[0033] Through the implementation of the above embodiments of the on-vehicle steel moving heat storage system, the layout of the feed water heat exchange pipe 3 can be preferably two types.

[0034] One type is that the feed water heat exchange pipe 3 is located in the air channels of each layer and is in a continuous S-shaped structure along a plurality of juxtaposed heat exchange gaps. This layout form can extend the path of the feed water heat exchange pipe 3 in the horizontal direction in the air channels of the same layer, increase the contact time between the medium inside the feed water heat exchange pipe 3 and the external air and steel, thereby enhancing the heat exchange coefficient. And the horizontal pipe body of the feed water heat exchange pipe 3 is located between two adjacent juxtaposed heat storage steel bars 22, without occupying the box space of the container body 5 additionally, improving the integration degree of the steel heat storage unit 2 and the feed water heat exchange pipe 3. At the same time, the feed water heat exchange pipe 3 is also spirally wound in multiple layers vertically, further utilizing the temperature gradient of the steel heat storage units 2 at different heights to achieve step-by-step heating of the feed water or high-temperature heating at the same level, reducing the irreversible heat exchange loss.

[0035] Another one is that a plurality of water supply heat exchange pipes 3 spirally arranged along multi-layer air channels are arranged side by side, and a water supply heat exchange pipe 3 is correspondingly arranged in each heat exchange gap arranged side by side. This layout form utilizes the plurality of water supply heat exchange pipes 3 arranged side by side to form a plurality of independent heat exchange channels, so that heat exchange of multiple channels can be carried out simultaneously, thereby improving the heat storage efficiency of the steel heat storage unit 2 and the heating and evaporation efficiency of the heat network water supply.

[0036] Furthermore, an electric heater is arranged on the steel heat storage unit 2, and the power output end of the peak shaving heating module is electrically connected to the electric heater; and / or, The steam or flue gas output end of the peak shaving heating module is connected to the heat network steam end 32 of the water supply heat exchange pipe 3, and the water supply return end of the peak shaving heating module is connected to the heat network water supply end 31 of the water supply heat exchange pipe 3.

[0037] Through the implementation of the above-mentioned embodiments of the on-vehicle steel mobile heat storage system: The power peak shaving side preferably supplies power during the low valley period of the power grid, such as when the output of wind power / photovoltaic is excessive. By starting the electric heater, electrical energy is converted into heat energy to electrically heat the steel heat storage unit 2, thereby relieving the pressure on the power grid and increasing the new energy consumption rate. Among them, each layer of the steel heat storage unit 2 is configured with an independent electric heater, and the electric heater is preferably any one of electric heating wires, electric heating plates, electric heating rods or graphite electrode heating rods, and can be switched on and off through a relay. Thus, by batch switching of the series or parallel electric heaters, the power consumption of the heat storage system is increased or decreased, so as to respond to the peak shaving and frequency modulation signals of the power grid or thermal power unit, realize heat storage energy storage using the surplus power of peak shaving and frequency modulation, and meet the second-level frequency modulation requirements of the power grid by adjusting the power in real time to match the frequency deviation of the power grid.

[0038] The energy storage peak shaving side preferably introduces steam extraction from a steam boiler, thermal power extraction or flue gas of a gas turbine, etc. into the water supply heat exchange pipe 3, and after air heat exchange transition, heats the steel heat storage unit 2. The condensed water or cooled flue gas after heat exchange is returned to the peak shaving heat source end, such as being reused in a thermal power plant, to realize a closed cycle. That is, when the thermal power unit is operating at a low load, the extracted steam or flue gas waste heat is introduced into the heat storage body to maintain the thermal efficiency of the unit, avoid a sharp increase in coal consumption during low load operation, and expand the thermal power peak shaving range.

[0039] As described above, the power peak shaving side and the energy storage peak shaving side can be used as a single heat source or as a dual heat source for mutual backup to ensure the energy supply safety under extreme weather / equipment failures. When used as a dual heat source, the peak-valley price difference can be earned by electric heating, and the fuel cost can be reduced by steam heating to maximize the economy. And by changing the steam heat storage amount and the electric heating power, respond to the peak shaving and frequency modulation signals of the power grid, new energy power station, and thermal power unit, so that the heat storage system can participate in power auxiliary service regulation and obtain auxiliary service income.

[0040] Preferably, the heat storage capacity of the heat storage device and the steam and / or electric heating capacity required for heating the steel heat storage unit 2 can be designed according to the demand of the power grid for heat storage in the power source, grid load, and energy storage, so that the heat storage system can meet the demand of peak shaving and frequency modulation on the power source side, thermal power unit side, grid side, load side of the power grid or in the energy storage station, or the heat demand of external heat users. According to the type of heat demand of external heat users, a heat storage device with a certain capacity is designed to finally heat the hot water or steam generated by the heat network feed water to meet the demand of heat network users. The steel type, size, and shape suitable for the steel heat storage unit 2 can also be selected according to the temperature range of the hot water or steam required by the heat network users, and the horizontal or vertical layout direction of the heat storage steel plate 21 can be selected and designed according to the temperature range of the hot water or steam to be generated by the heat storage device.

[0041] The present invention also discloses a heat storage and release method, which adopts the above-mentioned vehicle-mounted steel mobile heat storage system. The heat storage and release method includes: In response to the surplus power generated on the power peak shaving side of the peak shaving heating module, controlling the surplus power generated on the power peak shaving side to supply power and electrically heating the steel heat storage unit 2, and dynamically adjusting the power supply according to the heat demand of heat network users; and / or, In response to the steam or flue gas generated on the energy storage peak shaving side of the peak shaving heating module, controlling the steam or flue gas generated on the energy storage peak shaving side to enter the feed water heat exchange pipeline 3, and controlling the circulation fan 4 to drive the external air to flow through the feed water heat exchange pipeline 3 for heat absorption and temperature rise. The heated air continues to flow and convectively transfers the heat to the steel heat storage unit 2, and dynamically adjusts the power of the steam or flue gas input according to the heat demand of heat network users; In response to the heat demand of heat network users, switching to control the heat network feed water to enter the feed water heat exchange pipeline 3, and controlling the circulation fan 4 to drive the external air to flow through the steel heat storage unit 2 for heat absorption and temperature rise. The heated air continues to flow and convectively transfers the heat to the feed water in the feed water heat exchange pipeline 3 until the heat network feed water is heated to superheated steam and circulates back to the heat network users.

[0042] Through the implementation of the above heat storage and release method embodiments, when there is surplus power in the power grid, such as the over-generation of wind power / photovoltaic power, the electric energy is input into the electric heater to heat the steel heat storage unit 2. And dynamically adjust the electric heating power according to the heat demand of heat network users, such as steam flow, temperature, etc., to achieve "adjusting electricity with electricity and adjusting heat with heat". Thereby, the abandoned wind and photovoltaic power can be absorbed, and the penetration rate of renewable energy can be increased; and the heat can be stored using the low valley electricity price, and the heating income during peak hours can be realized. In addition, the extraction steam of the thermal power unit or the industrial waste heat is introduced into the feed water heat exchange pipeline 3, and the air absorbs heat after flowing through the pipeline and then heats the steel heat storage unit 2. And the steam / flue gas flow can be dynamically adjusted according to the heat network demand to match the temperature gradient of the steel heat storage unit 2, improve the waste heat utilization rate of the unit, and assist in reducing the minimum load drop of the unit and maintaining the thermal efficiency of the unit, so as to quickly respond to the heat demand of heat network users.

[0043] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some of the technical features can be equivalently replaced; and all such modifications and replacements should fall within the protection scope of the present invention.

Claims

1. A mobile heat storage system for steel on a vehicle, characterized in that: The vehicle-mounted steel mobile heat storage system comprises: A heat storage device, comprising a mobile body, and a heat exchange component arranged on the mobile body, wherein the heat exchange component comprises a steel heat storage unit and a water supply heat exchange pipe, wherein a plurality of the steel heat storage units are stacked, and an air passage is formed between the steel heat storage units of adjacent layers, and the water supply heat exchange pipe is spirally arranged along the multiple layers of the air passage, and one end of the water supply heat exchange pipe is a water supply end of a heat network, and the other end of the water supply heat exchange pipe is a steam end of a heat network; A peak-shaving heating module is connected to the steel heat storage unit and is used to electrically heat the steel heat storage unit with the surplus power generated by the power peak-shaving side; and / or, The peak-shaving heating module is connected to the water supply heat exchange pipeline to link the steam or flue gas generated by the energy storage peak-shaving side to heat the steel heat storage unit; The heat transfer module includes a circulation fan, one side of the steel thermal storage unit forms an air inlet side connected to the multiple layers of air channels, and the other side of the steel thermal storage unit forms an air outlet side connected to the multiple layers of air channels, the air outlet side of the steel thermal storage unit is connected to the air inlet of the circulation fan, and the air inlet side of the steel thermal storage unit is connected to the air outlet of the circulation fan.

2. The vehicle-mounted steel mobile heat storage system according to claim 1 is characterized in that: A container body is arranged on the mobile body, the heat exchange assembly and the heat transfer module are both arranged in the container body, and the steel heat storage unit or the water supply heat exchange pipeline is connected to the peak-shaving heating module in the area where the mobile body is located.

3. The vehicle-mounted steel mobile heat storage system according to claim 2 is characterized in that: A heat-insulating layer is arranged on the inner wall of the container body.

4. The vehicle-mounted steel mobile heat storage system according to claim 2 is characterized in that: A fixing assembly is arranged in the container body, and the fixing assembly includes an air outlet plate arranged on the air outlet side of the steel thermal storage unit, and an air inlet plate arranged on the air inlet side of the steel thermal storage unit, one end of the steel thermal storage unit is connected to the air outlet plate, and the other end of the steel thermal storage unit is connected to the air inlet plate, wherein the air passage is also formed between the lowest layer of the steel thermal storage unit and the bottom box wall of the container body.

5. The vehicle-mounted steel mobile heat storage system according to claim 4 is characterized in that: A partition plate is arranged above the uppermost steel heat storage unit, and the air outlet plate, the air inlet plate, the partition plate and the wall of the container body form a closed heat exchange chamber; The air outlet plate is provided with air outlets which are connected with the air passages in a one-to-one correspondence, and a first downwind duct connected with the air inlet of the circulation fan is formed between the air outlet plate and the side box wall of the container body, an upwind duct connected with the air outlet of the circulation fan is formed between the partition plate and the top box wall of the container body, and an air inlet which is connected with the air passages in a one-to-one correspondence is provided on the air inlet plate, and a second downwind duct connected with the upwind duct is formed between the air inlet plate and the box wall of the container body.

6. The vehicle-mounted steel mobile heat storage system according to claim 5 is characterized in that: The heat transfer module also includes a drive motor, which is arranged on the side wall of the container body. The circulation fan is located at the connection position of the first downwind duct and the upwind duct, and the power input end of the circulation fan is connected to the output end of the drive motor.

7. The vehicle-mounted steel mobile heat storage system according to claim 4 or 5, characterized in that: The steel heat storage unit includes a heat storage steel plate and a plurality of heat storage steel bars supported below the heat storage steel plate, the plurality of heat storage steel bars are arranged side by side, and the air outlet plate and the air inlet plate are provided with connecting pieces, the two ends of the heat storage steel bars are respectively connected to the air outlet plate and the air inlet plate, and the ends of the heat storage steel bars are connected to the air outlet plate or the air inlet plate by means of displacement compensation.

8. The vehicle-mounted steel mobile heat storage system according to claim 7 is characterized in that: A heat exchange gap is formed between adjacent heat storage steel bars; The water supply heat exchange pipe is located in the air channel of each layer along a plurality of heat exchange gaps arranged side by side in a continuous S-shaped structure; or, A plurality of water supply heat exchange pipes are arranged in a spiral pattern along the multiple layers of air channels in parallel, and one water supply heat exchange pipe is correspondingly arranged in each of the parallel heat exchange gaps.

9. The vehicle-mounted steel mobile heat storage system according to claim 1, characterized in that: The steel thermal storage unit is provided with an electric heater, and the power output end of the peak-shaving heating module is electrically connected to the electric heater; and / or, The steam or flue gas output end of the peak-shaving heating module is connected to the hot network steam end of the water supply heat exchange pipeline, and the water supply return end of the peak-shaving heating module is connected to the hot network water supply end of the water supply heat exchange pipeline.

10. A heat storage and release method, using the vehicle-mounted steel mobile heat storage system according to any one of claims 1 to 9, characterized in that: The heat storage and release method comprises: In response to the surplus power generated by the peak-shaving side of the peak-shaving heating module, the surplus power generated by the peak-shaving side is controlled to supply power and electrically heat the steel thermal storage unit, and the power supply is dynamically adjusted according to the heat demand of the heat network users; and / or, In response to the generation of steam or flue gas on the energy storage peak-shaving side of the peak-shaving heating module, the steam or flue gas generated on the energy storage peak-shaving side is controlled to enter the water supply heat exchange pipeline, and the circulating fan is controlled to drive the external air to flow through the water supply heat exchange pipeline to absorb heat and heat up. The heated air continues to flow and convectively transfers the heat to the steel thermal storage unit. The power of the steam or flue gas input is dynamically adjusted according to the heat demand of the heat network users. In response to the heating demand of the heating network users, the heating network feed water is switched to control the feed water heat exchange pipeline, and the circulating fan is controlled to drive the external air to flow through the steel heat storage unit to absorb heat and heat up. The heated air continues to flow and transfers heat to the feed water in the feed water heat exchange pipeline by convection until the heating network feed water is heated to superheated steam and circulated back to the heating network users.

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