Compound Structure Steam-Solid Heat Storage Device

Abstract

The present invention discloses a compound structure steam-solid heat storage device, which closely arranges each steam-solid heat storage unit body by using a compound structure, so that adjacent units share a set of functional components, achieving the effect of reducing the floor area. The technical solutions adopted include: steam-solid heat storage units, support platforms, steam collection tanks, condensate tanks, steam drums, heat exchangers, etc. The steam-solid heat storage unit is composed of a solid heat storage body and a heat exchange component. Two or more steam-solid heat storage units can be arrayed and installed as a whole relying on the support platform. The solid heat storage body is a masonry structure of sintered bricks, and a combination body of superheated steam heat storage bodies, saturated steam heat storage bodies, and condensate heat storage bodies is arranged in sequence horizontally or vertically to respectively absorb the heat energy of the superheated section, saturated section, and condensate section of the steam, achieving a large heat storage capacity; and when discharging heat, the high-temperature water is gradually heated through this solid heat storage device to generate superheated steam that meets the user's needs for the user to use, realizing precise energy saving.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid heat storage, and in particular relates to a compound structure steam solid heat storage device for saving energy. Background Art

[0002] Installing a steam solid heat storage system in thermal power plants and heat source plants mainly aims to solve the problem that due to the internal heat radiation inertia of the furnace combustion chamber of coal-fired and gas-fired boilers, the steam output cannot be quickly reduced to match the user's demand. At the same time, the boiler also has a reduced thermal efficiency in the state of too low steam output and is prone to boiler stable combustion accidents. Storing the excess steam of the boiler by using the steam solid heat storage system and releasing it during the peak period of steam use is a good way to save energy and prevent energy waste. In addition, installing a steam solid heat storage system requires occupying the site of the factory area. If there is no large building land, a steam solid heat storage device with a large heat storage capacity cannot be installed, which will greatly affect the popularization and application of energy-saving equipment. Summary of the Invention

[0003] In view of the above problems, the present invention provides a compound structure steam solid heat storage device, which closely arranges each steam solid heat storage unit body by using a compound structure, so that adjacent steam solid heat storage units share a set of functional components, achieving the effect of reducing the floor area.

[0004] The technical solution adopted by the present invention is as follows: A compound structure steam-solid heat storage device, which includes: a steam-solid heat storage unit, a support platform, a steam collector, a condensate tank, a steam drum, a heat exchanger, a circulation fan, valves, and connecting pipes. It is characterized in that: The steam-solid heat storage unit is composed of a solid heat storage body and a heat exchange component. Two or more steam-solid heat storage units can be arrayed and installed as a whole relying on the support platform; The solid heat storage body is a masonry structure made of sintered bricks. A metal heat conduction net is horizontally arranged in the mortar of the masonry structure, and it is a combination body of superheated steam solid heat storage bodies, saturated steam solid heat storage bodies, and condensate solid heat storage bodies arranged in sequence horizontally or vertically. Thermal insulation layers are provided around and on the top of the combination body; Among them, a serpentine shape with two end ports horizontally arranged and capable of withstanding high-temperature and high-pressure steam is arranged inside the superheated steam solid heat storage body, and the superheated steam heat exchange pipeline is connected to the steam drum at port A of the superheated steam heat exchange pipeline and connected to the superheated steam input and output pipeline at port B of the superheated steam heat exchange pipeline; Inside the saturated steam solid heat storage body, there are left air duct through holes and right air duct through holes that are connected to the circulating air duct and are arrayed. A wind baffle made of a metal plate or a refractory partition wall is erected at the boundary between the left and right air duct through holes; Inside the condensate solid heat storage body, a serpentine shape with two end ports horizontally arranged and capable of withstanding high-temperature and high-pressure hot water is arranged, and the condensate heat exchange pipeline is connected to the lower port of the heat exchanger through a condensate control valve at port C of the condensate pipeline, and port D of the condensate pipeline is connected to the condensate tank; The heat exchange component is composed of a heat exchanger, a steam drum, a steam collector, a circulation fan, and a circulating air duct. Among them, the circulating air duct is an air circulation closed loop starting from the circulation fan and sequentially connecting the air supply duct, the outer air equalizing hood, the right air duct through hole, the return air cavity, the left air duct through hole, the inner air equalizing hood, the heat exchanger, and the circulation fan; A wind guiding plate for reducing the resistance of the circulating air in the circulating air duct is also arranged in the return air cavity; The steam drum is arranged at the top of the steam collector and is a metal pressure vessel used to connect the saturated steam outlet and connect the superheated steam heat exchange pipelines A of each column of steam-solid heat storage units adjacent vertically below; The top of the condensate tank is connected to a horizontal connecting pipe, and an automatic exhaust valve and a manual exhaust valve are also provided on the horizontal connecting pipe; The support platform includes a foundation, platform vertical beams, and a platform.

[0005] The present invention includes: The heat exchanger is a component with pressure-resistant and high-temperature-resistant metal finned tubes arrayed, which releases the steam phase change heat energy to the saturated steam solid heat storage body and absorbs the heat energy of the saturated steam released by the saturated steam solid heat storage body by using air as a circulating heat conduction medium; The upper port of the heat exchanger is connected to the steam collector through a steam collection control valve, and the lower port is connected to port C of the condensate pipeline through a condensate control valve.

[0006] The present invention also includes: The condensate tank and the steam collector are cylindrical pressure vessels made of heat-resistant metal.

[0007] The present invention further includes: The circulating fan is a variable-frequency fan, which is a device capable of controlling the flow direction and flow rate of hot air in the circulating air duct.

[0008] The present invention has the following advantages and effects: The compound structure steam-solid heat storage device provided by the present invention can realize independent and precise control of each steam-solid heat storage unit in the process of regulating the release of steam heat energy to the solid heat storage body and controlling the extraction of heat energy from the solid heat storage body to heat the high-temperature water in the heat exchanger to produce saturated steam, thereby achieving precise energy saving. A steam-solid heat storage device with a large heat storage capacity can be installed using limited floor space. Each solid heat storage body stores the heat energy of the superheat section, saturated section, and condensation section of the steam respectively, achieving a large heat storage capacity; and when releasing heat, the high-temperature water is gradually heated by this solid heat storage device to generate superheated steam that meets the user's needs for the user to use. Brief Description of the Drawings

[0009] Figure 1 is a schematic side view structure diagram of the present invention;

[0010] Figure 2 is the present invention Figure 1 of the left view structure schematic diagram;

[0011] Figure 3 is the present invention Figure 2 of the vertical arrangement structure schematic diagram of three types of solid heat storage bodies;

[0012] Figure 4 is the present invention Figure 2 of the horizontal arrangement structure schematic diagram of three types of solid heat storage bodies;

[0013] Figure 5 is a schematic diagram of the structure of a group of steam-solid heat storage units of the present invention;

[0014] Figure 6 is the present invention Figure 5 of the vertical arrangement structure schematic diagram of three types of solid heat storage bodies;

[0015] Figure 7 is the present invention Figure 5 of the horizontal arrangement structure schematic diagram of three types of solid heat storage bodies;

[0016] Figure 8 is the present invention Figure 5 of the top view structure schematic diagram of the saturated steam solid heat storage body;

[0017] Figure 9 is the structure schematic diagram of the serpentine heat exchange pipe in the present invention.

[0018] Description of the main components in the figure: 1. Foundation, 2. Platform vertical beam, 3. Platform, 4. Solid heat storage body, 4-0. Thermal insulation layer, 4-1. Superheated steam solid heat storage body, 4-2. Saturated steam solid heat storage body, 4-3. Condensate solid heat storage body, 5. Condensate tank, 6. Steam drum, 7. Steam collector, 8. Heat exchanger, 9. Circulation fan, 10. Air supply duct, 11. Steam collector control valve, 11-1. Condensate control valve, 12. Superheated steam heat exchange pipeline, 12-1. Port A of the superheated steam heat exchange pipeline, 12-2. Port B of the superheated steam heat exchange pipeline, 13. Right air duct through hole, 13-1. Left air duct through hole, 14. Condensate heat exchange pipeline, 14-1. Port C of the condensate pipeline, 14-2. Port D of the condensate pipeline, 15. Partition board, 16. Return air chamber, 16-1. Inner air distribution hood, 16-2. Outer air distribution hood, 17. Saturated steam output pipe, 18. Air guide plate, 19. Metal heat conduction net, 20. Superheated steam input / output pipeline, 21. Condensate input / output pipeline, 22. Pressure regulating valve, 23. Heat storage steam control valve, 23-1. Exothermic steam control valve, 23-2. Condensate control valve, 23-3. Make-up water control valve, 24. Superheated steam input port, 25. High-temperature condensate outlet, 26. Pressure water inlet, 27. Superheated steam output port, 28. Horizontal connecting pipe, 29. Automatic exhaust valve, 30. Manual exhaust valve.

[0019] This attached drawing is only a schematic diagram of an embodiment of the present invention. For those of ordinary skill in the art, other attached drawings can be obtained based on this drawing without creative efforts. Specific embodiments

[0020] The following will make a detailed description of the specific embodiments of the present invention in conjunction with the attached drawings. The following description is only for demonstration and explanation, and does not impose any formal restrictions on the present invention.

[0021] Example 1

[0022] As shown in Figures 1 to 8, the figure includes a foundation 1, a platform vertical beam 2, a platform 3, a solid heat storage body 4, a heat insulation layer 4-0, a superheated steam solid heat storage body 4-1, a saturated steam solid heat storage body 4-2, a condensate solid heat storage body 4-3, a condensate tank 5, a steam drum 6, a steam collector 7, a heat exchanger 8, a circulation fan 9, a blast air duct 10, a steam collector control valve 11, a condensate control valve 11-1, a superheated steam heat exchange pipeline 12, a superheated steam heat exchange pipeline A port 12-1, a superheated steam heat exchange pipeline B port 12-2, a right air duct through hole 13, a left air duct through hole 13-1, a condensate heat exchange pipeline 14, a condensate pipeline C port 14-1, a condensate pipeline D port 14-2, a partition plate 15, a return air cavity 16, an inner air equalizing hood 16-1, an outer air equalizing hood 16-2, a saturated steam output pipe 17, a wind guiding plate 18, a metal heat conduction net 19, a superheated steam input and output pipeline 20, a condensate input and output pipeline 21, a pressure regulating valve 22, a heat storage steam control valve 23, a heat release steam control valve 23-1, a condensate control valve 23-2, a make-up water control valve 23-3, a superheated steam input port 24, a high-temperature condensate outlet 25, a pressure water inlet 26, a superheated steam output port 27, a horizontal connecting pipe 28, an automatic air vent valve 29, a manual air vent valve 30; in the steam solid heat storage unit, it includes a solid heat storage body 4 and a heat exchange component, and multiple steam solid heat storage units (see Figure 5 ) can be installed as a whole relying on the support platform array; the solid heat storage body 4 is made of sintered bricks as the masonry material, and a metal heat conduction net 19 is horizontally arranged in the masonry mortar, and it is a combination of a superheated steam solid heat storage body 4-1, a saturated steam solid heat storage body 4-2, and a condensate solid heat storage body 4-3 arranged in sequence horizontally or vertically, and heat insulation layers 4-0 are provided around and on the top of the combination body. Among them, a superheated steam heat exchange pipeline serpentine structure (such as Figure 9 ) with horizontal arrangement at both ends is arranged inside the superheated steam solid heat storage body 4-1, and the superheated steam heat exchange pipeline 12 that can withstand high-temperature and high-pressure steam, the superheated steam heat exchange pipeline A port 12-1 is connected to the steam drum 6 through the saturated steam output pipe 17, and the superheated steam heat exchange pipeline B port 12-2 is connected to the superheated steam input and output port 20. In the saturated steam solid heat storage body 4-2, left air duct through holes 13-1 and right air duct through holes 13 that are connected to the circulation air duct and are arrayed are provided, and a wind blocking partition plate 15 is erected at the boundary of the left and right air duct through holes. A serpentine structure (such as Figure 9( ), the condensate heat exchange pipe 14 that can withstand high-temperature and high-pressure hot water. The C port 14-1 of the condensate pipe is connected to the lower port of the heat exchanger 8 through the condensate control valve 11-1, and the D port 14-2 of the condensate pipe is connected to the condensate tank 5; the heat exchange component consists of the heat exchanger 8, the steam drum 6, the steam collector tank 7, the circulation fan 9 and the circulation air duct. Among them, the circulation air duct is an air circulation closed loop starting from the circulation fan 9 and sequentially connecting the air supply duct 10, the outer air equalizing hood 16-2, the right air duct through hole 13, the return air chamber 16, the left air duct through hole 13-1, the inner air equalizing hood 16-1, the heat exchanger 8, and the circulation fan 9. The air deflector 18 is a curved metal plate provided in the return air chamber 16 to reduce the resistance of the circulating air in the circulation air duct. The steam drum 6 is provided at the top of each steam collector tank 7 and is a metal pressure vessel connected to the A port 12-1 of each superheated steam heat exchange pipe in the two adjacent vertical columns of steam solid heat storage units below through the saturated steam output pipe 17; the support platform includes the foundation 1, the platform vertical beam 2, and the platform 3, and is a multi-story building made of steel structure or concrete, provided with heat exchange components and equipped with an electric elevator for personnel to work; the heat exchanger 8 is an array of pressure-resistant and high-temperature-resistant metal finned tube components that release steam phase change heat energy to the saturated steam solid heat storage body 4-2 and absorb the heat energy generated by the release of the saturated steam solid heat storage body 4-2 by using air as a circulating heat conduction medium. The upper port of the heat exchanger 8 is connected to the steam collector tank 7 through the steam control valve 11, and the lower port is connected to the C port 14-1 of the condensate pipe through the condensate control valve 11-1; the condensate tank 5 and the steam collector tank 7 are cylindrical pressure vessels made of heat-resistant metal; the circulation fan 9 is a variable-frequency fan and is a device that can control the flow direction and flow rate of the hot air in the circulation air duct.

[0023] Design, construction and installation process: When designing the duplex structure steam solid heat storage device, it can adopt (such as Figure 3 ) arrange each solid heat storage body 4 horizontally or can adopt (such as Figure 4Arrange each solid heat storage body 4 vertically, or arrange each solid heat storage body 4 horizontally and vertically in a cross pattern, that is: horizontally arrange the condensate solid heat storage body 4-3 on the foundation of this layer, or construct the condensate solid heat storage body 4-3 according to the required strength of the foundation, and then vertically install the superheated steam solid heat storage body 4-1 and the saturated steam solid heat storage body 4-2 on the condensate solid heat storage body 4-3. After the design scheme of the compound structure steam solid heat storage device is determined, first construct the equipment foundation on the selected site where the compound structure steam solid heat storage device can be installed. Construct according to the number of steam solid heat storage units in the horizontal direction and the number of installation layers of steam solid heat storage units in the vertical direction required by the designed compound structure steam solid heat storage device, including the support platforms of the foundation 1, the platform vertical beams 2, and the platform 3. When the support platform reaches the safe use condition, install the heat exchange components of the steam solid heat storage unit in the support platform, and install the solid heat storage body 4 at the position corresponding to the heat exchange component. Follow the construction sequence from low to high. The foundation made at the top of the bottom-layer solid heat storage body 4 should be connected to the platform 3 at the same height, so that the installation foundation of the solid heat storage body 4 and the platform 3 become an integral whole, with the strength to resist fracture, overturning, and earthquake. Then construct and install the upper-layer solid heat storage body 4 until the highest layer is completed. After the heat preservation construction of the outer layer of the compound structure steam solid heat storage device and the connection of the user pipelines are completed, the compound structure steam solid heat storage device is ready for use.

[0024] Heat storage working process: The compound structure steam-solid heat storage device is an integrated equipment that works under the control of a control system. The process is as follows: Open the heat storage steam control valve 23 and the condensate control valve 23-2, and close the heat release steam control valve 23-1 and the makeup water control valve 23-3. Then, high-temperature steam enters the B port 12-2 of the superheated steam heat exchange pipeline of each steam-solid heat storage unit through the hot steam input port 24 and the superheated steam input / output port 20, and is absorbed and cooled by each superheated steam-solid heat storage body 4-1. The sub-superheated steam flowing out from the A port 12-1 of each superheated steam heat exchange pipeline enters the steam drum 6 through the saturated steam output pipe 17, and then is sent to the heat exchanger 8 through the steam collecting control valve 11 connected to each steam collecting tank 7. Start the circulating fan 9 to make the low-temperature circulating air in each circulating air duct blow towards the heat exchanger 8, absorb the heat energy carried by the steam in the heat exchanger 8 and heat up. The high-temperature circulating air formed after passing through the heat exchanger 8 is sent into the left air duct through hole 13-1 and the right air duct through hole 13 of the saturated steam-solid heat storage body 4-2 through the inner air distribution hood 16-1 to release heat, so that the temperature of the saturated steam heat storage body 4-2 increases. The condensate formed in the heat exchanger 8 after the high-temperature steam releases heat flows into the condensate heat exchange pipeline 14 from the C port 14-1 of the condensate pipeline, continues to cool down after being absorbed by the condensate-solid heat storage body 4-3, and then flows out from the D port 14-2 of the condensate pipeline to the condensate tank 5, and flows out at the high-temperature condensate outlet 25 through the condensate input / output pipeline 21, the condensate control valve 23-2, and the pressure regulating valve 22. When the heat storage temperature of each solid heat storage body 4 reaches the required temperature, close the heat storage steam control valve 23, and this heat storage work is completed.

[0025] Exothermic working process: The compound structure steam-solid heat storage device is an integral equipment, which works under the control of a control system. The description is as follows. Close the heat storage steam control valve 23 and the condensate control valve 23-2, and open the exothermic steam control valve 23-1 and the make-up water control valve 23-3. Then, high-temperature water enters each condensate tank 5 through the pressure water inlet 26 and the condensate input and output pipeline 21. The automatic exhaust valve 29 and the manual exhaust valve 30 on the horizontal connecting pipe 28 at the top of the condensate tank 5 discharge the air inside the condensate tank 5 during the exothermic work, ensuring that there is no air lock phenomenon in the condensate tank 5. The high-temperature water filling the condensate tank 5 is sent to the D port 14-2 of the condensate pipeline, heated and raised in temperature by the condensate solid heat storage body 4-3. The heated high-temperature water flows into the heat exchanger 8 through the C port 14-1 of the condensate pipeline and the condensate control valve 11-1. Start the circulation fan 9, so that the low-temperature circulating air in the circulation air duct blows into the right air duct through hole 13 and the left air duct through hole 13-1 of the saturated steam solid heat storage body 4-2 through the outer air distribution hood 16-2 to absorb the heat energy of the saturated steam heat storage body 4-2, forming a circulating high-temperature air that enters the heat exchanger 8 through the inner air distribution hood 16-1. The high-temperature air enters the heat exchanger 8, causing the high-temperature water in the heat exchanger 8 to release heat to generate high-temperature steam, which is sent to the steam collecting tank 7. The steam in the steam collecting tank 7 accumulates in the steam drum 6, enters the hot steam heat exchange pipeline 12 in the superheated steam solid heat storage body 4-1 through the saturated steam output pipe 17 and the A port 12-1 of the superheated steam heat exchange pipeline, superheats the saturated steam, and passes through the B port 12-2 of the superheated steam heat exchange pipeline, the superheated steam input and output port 20, and the exothermic steam control valve 23-1, and is sent to the user from the superheated steam output port 27. When the air temperature output by the saturated steam solid heat storage body 4-2 cannot make the heat exchanger 8 generate saturated steam that meets the user's required parameters or the superheated steam solid heat storage body 4-1 cannot superheat the steam up to the standard, this exothermic work ends.

[0026] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail, those of ordinary skill in the art should understand that the embodiments of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the embodiments of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A compound structure steam-solid heat storage device, which comprises: a steam-solid heat storage unit, a support platform, a steam collector, a condensate tank, a steam drum, a heat exchanger, and a circulation fan, and is characterized in that: The steam solid heat storage unit is composed of a solid heat storage body and a heat exchange component. Two or more steam solid heat storage units can be installed as a whole relying on a support platform array. The solid heat storage body is a masonry structure made of sintered bricks. A metal heat conduction net is horizontally arranged in the mortar of the masonry structure. It is a combination of superheated steam solid heat storage bodies, saturated steam solid heat storage bodies and condensate solid heat storage bodies arranged in sequence horizontally or vertically. Thermal insulation layers are provided around and on the top of the combination. Among them, a serpentine pipe with two horizontal ports is arranged inside the superheated steam solid heat storage body, and the superheated steam heat exchange pipe that can withstand high-temperature and high-pressure steam. The A port of the superheated steam heat exchange pipe is connected to the steam drum, and the B port of the superheated steam heat exchange pipe is connected to the superheated steam input and output pipe. In the saturated steam solid heat storage body, there are left air duct through holes and right air duct through holes that are connected to the circulating air duct and distributed in an array. A wind baffle made of a metal plate or a refractory partition wall is erected at the boundary between the left and right air duct through holes. Inside the condensate solid heat storage body, a serpentine pipe with two horizontal ports is arranged, and the condensate heat exchange pipe that can withstand high-temperature and high-pressure hot water. The C port of the condensate pipe is connected to the lower port of the heat exchanger through a condensate control valve, and the D port of the condensate pipe is connected to the condensate tank. The heat exchange component is composed of a heat exchanger, a steam drum, a steam collector, a circulating fan, and a circulating air duct. The circulating air duct is an air circulation closed loop that starts from the circulating fan and sequentially connects the air supply duct, the outer air equalizing hood, the right air duct through hole, the return air cavity, the left air duct through hole, the inner air equalizing hood, the heat exchanger, and the circulating fan. A wind guide plate for reducing the resistance of the circulating air in the circulating air duct is also arranged in the return air cavity. The steam drum is arranged at the top of the steam collector and is a metal pressure vessel for connecting the saturated steam outlet and connecting the A ports of the superheated steam heat exchange pipes in the two adjacent vertical columns of steam solid heat storage units below. The top of the condensate tank is connected to a horizontal connecting pipe, and an automatic exhaust valve and a manual exhaust valve are also provided on the horizontal connecting pipe. The support platform includes a foundation, platform vertical beams, and a platform. The condensate tank and the steam collector are cylindrical pressure vessels made of heat-resistant metal. The circulating fan is a variable-frequency fan and is a device that can control the flow direction and flow rate of hot air in the circulating air duct.

2. The compound structure steam-solid heat storage device according to claim 1, characterized in that: The heat exchanger is a component with pressure-resistant and high-temperature-resistant metal finned tube arrays that release steam phase change heat energy to the saturated steam solid heat storage body and absorb the heat energy generated by the saturated steam released by the saturated steam solid heat storage body through air as a circulating heat conduction medium. The upper port of the heat exchanger is connected to the steam collector through a steam collection control valve, and the lower port is connected to the C port of the condensate pipe through a condensate control valve.

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