A high-efficiency plate-type thermochemical energy storage reactor

Abstract

The present invention discloses a high-efficiency plate-type thermochemical energy storage reactor, comprising a porous gas distribution plate, a fine mesh and a rectangular enhanced heat exchange plate which are symmetrically arranged and stacked from the inside to the outside; a gas transport layer is formed between two porous gas distribution plates; the outer side of the porous gas distribution plate is in close contact with the inner side of the fine mesh; a thermochemical reaction chamber is formed between the outer side of the fine mesh and the inner side of the enhanced heat exchange plate, and a heat transfer fluid heat exchange chamber is formed between the outer side of the enhanced heat exchange plate at both ends and the inlet and outlet side cover plates and the non-inlet and outlet side cover plates, respectively; a gas reactant channel, a heat transfer fluid inflow channel and a heat transfer fluid outflow channel are formed by stacking the circular holes opened on the porous gas distribution plate, the fine mesh, the enhanced heat exchange plate and the inlet and outlet side cover plates, wherein the gas reactant channel is only connected to the gas transport layer, and the heat transfer fluid inflow channel and the heat transfer fluid outflow channel are only connected to the heat transfer fluid heat exchange chamber. The present invention improves the performance of the thermochemical energy storage reactor and the effect of energy storage and energy release rate.

Description

Technical Field

[0001] The invention relates to the technical field of heat transfer enhancement and thermochemical energy storage, and in particular to a high-efficiency plate-type thermochemical energy storage reactor. Background Art

[0002] The continuous development of the field of heat transfer enhancement has given birth to different types of heat exchange equipment, among which the equipment that transfers heat from hot fluid to cold fluid is called heat exchanger. According to the heat exchange principle, heat exchangers can be divided into: partition heat exchangers, heat storage heat exchangers, direct contact heat exchangers and heat carrier heat exchangers. Among the partition heat exchangers, the plate heat exchanger has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small footprint and long service life. Under the same pressure loss, its heat transfer coefficient is 3 to 5 times higher than that of the tube heat exchanger, but the footprint is only one-third of that of the tube heat exchanger, and the heat recovery rate is more than 90%, so it stands out among the partition heat exchangers.

[0003] The heat transfer effect during the charging and discharging process of the thermochemical energy storage system is a key factor affecting its energy storage performance; at the same time, the high heat flux density of the plate heat exchanger complements the high energy storage density of the thermochemical energy storage system.

[0004] However, existing thermochemical energy storage devices have a common problem: poor heat transfer. This is largely due to the poor thermal conductivity of the solid energy storage material itself and the overly dense stacking of the energy storage material. Poor heat transfer performance will lead to an increase in the problem of unbalanced temperature distribution in the entire device, weakening the reaction performance.

[0005] Therefore, trying to apply the plate heat exchange principle to the energy storage and release process of the thermochemical energy storage system is of great significance for promoting the application and promotion of the thermochemical energy storage system. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a high-efficiency plate-type thermochemical energy storage reactor, which improves the heat transfer performance of the thermochemical energy storage device through the excellent heat exchange performance of the plate heat exchanger, thereby achieving the effect of improving the performance of the thermochemical energy storage reactor. Energy storage and energy release rate.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A high-efficiency plate-type thermochemical energy storage reactor, comprising a porous gas distribution plate, a fine mesh, an enhanced heat exchange plate, an inlet and outlet side cover plate, a non-inlet and outlet side cover plate, a gas transport layer, a thermochemical reaction chamber, a heat transfer fluid heat exchange chamber, a gas reactant channel, a heat transfer fluid inlet channel and a heat transfer fluid outlet channel;

[0009] Two porous air distribution plates are arranged symmetrically, and two symmetrically arranged fine meshes are arranged on the outside of the two porous air distribution plates, and two symmetrically arranged enhanced heat exchange plates are arranged on the outside of the two fine meshes; a gas transport layer is formed between the two porous air distribution plates; the outside of the porous air distribution plate is in close contact with the inside of the fine mesh; a thermochemical reaction chamber is formed between the outside of the fine mesh and the trough-type thermochemical energy storage structure on the inside of the enhanced heat exchange plate, and a heat transfer fluid heat exchange chamber is formed between the outside of the enhanced heat exchange plates at the head and tail ends and the inlet and outlet side cover plates and the non-inlet and outlet side cover plates respectively, and the gas reactant channel, the heat transfer fluid inlet channel, and the heat transfer fluid outflow channel are formed by stacking the circular holes opened on the above-mentioned porous air distribution plates, fine meshes, enhanced heat exchange plates, and inlet and outlet side cover plates, wherein the gas reactant channel is only connected to the gas transport layer, and the heat transfer fluid inlet channel and the heat transfer fluid outflow channel are only connected to the heat transfer fluid heat exchange chamber.

[0010] The edge positions of the plate surface structures of the porous gas distribution plate, the fine mesh and the two sides of the rectangular enhanced heat exchange plate are consistent, and circular holes of the same size for the heat transfer fluid and the reaction gas to pass through are opened at the same position; the circular holes of the three are aligned with each other;

[0011] The circular holes of the gas reactant channel are located on the same projection plane;

[0012] The circular holes of the heat transfer fluid inflow channel are located on the same projection plane;

[0013] The circular holes of the heat transfer fluid outflow channel are located on the same projection plane.

[0014] The circular hole has the same cross-sectional shape and size as the gas reactant channel, the heat transfer fluid inflow channel, and the heat transfer fluid outflow channel.

[0015] The porous gas distribution plates all have raised edges that are 90 degrees to the plate surface. The raised edges of two porous gas distribution plates are aligned and close together to form a gas transport layer whose bottom surface shape is consistent with the porous gas distribution plates and has a certain thickness.

[0016] The thermochemical reaction chamber is used to load solid particle reactants to carry out thermochemical energy storage or energy release reactions. The mesh size of the fine mesh should be smaller than the diameter of the reacting solid particles, so as to restrict the solid particle reactants in the thermochemical reaction chamber from entering the gas transport layer, while ensuring that the gas reactants enter the thermochemical reaction chamber from the gas transport layer.

[0017] The porous gas distribution plate is used for organizing the gas flow of gaseous reactants so that the gaseous reactants enter the thermochemical reaction chamber uniformly in the normal direction of the porous gas distribution plate.

[0018] The fine mesh is closely attached to the outer side of the porous air distribution plate, and the mesh size thereof is smaller than the diameter of the solid reaction particles in the thermochemical reaction chamber, so as to prevent the solid reaction particles from leaking from the thermochemical reaction chamber.

[0019] The inner surface of the enhanced heat exchange plate is processed with a groove structure for filling solid materials, which is used to stack itself to form a thermochemical reaction chamber; the outer surface of the plate is processed with a corrugated fin structure for flowing heat transfer fluid, which is used to stack itself to form a heat transfer fluid heat exchange chamber. The thickness between the structures on both sides of the plate surface is very small, which can reduce the heat transfer resistance between the two and further enhance the heat exchange between the reactants and the heat transfer fluid. In addition, the plate can expand the scale of the reaction device by periodically stacking itself.

[0020] The non-inlet and outlet side cover plate has no holes and is used to change the flow direction of the heat transfer fluid so that it flows back to the outlet end on the side of the inlet end.

[0021] The inlet and outlet side cover plates and the non-inlet and outlet side cover plates are used to fix the periodically stacked enhanced heat exchange plates, and the heat transfer fluid heat exchange cavities on the inlet and outlet side cover plates and the non-inlet and outlet side cover plates are in contact with the heat transfer fluid heat exchange cavities of the enhanced heat exchange plates.

[0022] The porous air distribution plate, fine mesh, and enhanced heat exchange plate are basic structural units, and the scale is expanded in a periodic stacking manner by increasing the number of the basic structural units.

[0023] The gas transport layer is formed between two porous gas distribution plates and is used to improve the distribution of the reaction gas entering the thermochemical reaction chamber to achieve a uniform reaction.

[0024] The heat transfer fluid heat exchange cavity is a corrugated fin structure, which is used to provide or absorb heat of thermochemical reactions.

[0025] The gas reactant channel is used for inputting gas reactants or outputting gas products, and the heat transfer fluid inflow channel and the heat transfer fluid outflow channel provide corresponding inlet and outlet channels for the heat transfer fluid;

[0026] The gas reactant channels and the heat transfer fluid inflow channels are located above the plate, and the heat transfer fluid inflow channels are located below the plate.

[0027] Beneficial effects of the present invention:

[0028] The present invention greatly increases the heat exchange area of ​​the thermochemical energy storage device through the heat exchange method of the plate heat exchanger, significantly improves its heat transfer performance, and realizes a significant improvement in the heat exchange efficiency of the thermochemical energy storage device. At the same time, it breaks the heat exchange mode between the cold fluid and the hot fluid of the traditional heat exchanger, adopts the mechanism of direct heat exchange between fluid and solid, and provides new possibilities for the design ideas and usage methods of the heat exchanger.

[0029] The present invention uses a plate heat exchanger as a fluid transport method for a thermochemical energy storage reaction device to transport gaseous reactants or products, which greatly increases the contact area between solid materials and gaseous materials and improves the reaction performance of the thermochemical energy storage reaction device to a certain extent.

[0030] The present invention has good scalability and can switch between different reactor types through slight structural adjustment and external corresponding pipelines, thereby achieving functional diversification and simple and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the energy release workflow of a high-efficiency plate-type thermochemical energy storage reactor provided by the present invention.

[0032] Figure 2 A schematic diagram of the energy storage workflow of a high-efficiency plate-type thermochemical energy storage reactor provided by the present invention.

[0033] Figure 3 It is a partial side cross-section view and a schematic diagram of the stacking method of the enhanced heat exchange plate in a high-efficiency plate-type thermochemical energy storage reactor.

[0034] Figure 4 This is a cross-sectional view of the inlet and outlet side cover plates and the non-inlet and outlet side cover plates in a high-efficiency plate-type thermochemical energy storage reactor. The left side is the inlet and outlet side cover plate, and the right side is the non-inlet and outlet side cover plate.

[0035] Figure 5 It is a cross-sectional view of the stacked combination of enhanced heat exchange plates, inlet and outlet side cover plates and non-inlet and outlet side cover plates in a high-efficiency plate-type thermochemical energy storage reactor.

[0036] The parts in the figure are marked as follows: porous gas distribution plate 1, fine mesh 2, enhanced heat exchange plate 3, inlet and outlet side cover plate 4, non-inlet and outlet side cover plate 5, gas transport layer 6, thermochemical reaction chamber 7, heat transfer fluid heat exchange chamber 8, gas reactant channel 9, heat transfer fluid inflow channel 10, and heat transfer fluid outflow channel 11. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with embodiments.

[0038] Figure 1 A schematic diagram of the working process of a high-efficiency plate-type thermochemical energy storage reactor provided by the present invention. The parts in the figure are marked as follows: porous gas distribution plate 1, fine mesh 2, enhanced heat exchange plate 3, inlet and outlet side cover plate 4, non-inlet and outlet side cover plate 5, gas transport layer 6, thermochemical reaction chamber 7, heat transfer fluid heat exchange chamber 8, gas reactant channel 9, heat transfer fluid inflow channel 10, heat transfer fluid outflow channel 11 and related fixing devices and sealing components;

[0039] When the device is working, the heat transfer fluid passes through the heat transfer fluid heat exchange cavity 8 on each plate, and flows into and out of the heat transfer fluid heat exchange cavity 8 through the heat transfer fluid inlet channel 10 and the heat transfer fluid outlet channel 11, thereby realizing high heat flux density heat exchange with the thermochemical reaction cavity 7; the thermochemical reaction gas flows into or out of the thermochemical reaction cavity 7 through the gas reactant channels 9 on each plate along with the advancement of the thermochemical reaction process in the thermochemical reaction cavity 7, thereby realizing the process of rapid energy charging and discharging of the entire device.

[0040] Take the fixed bed CaO / Ca(OH)2 thermochemical energy storage reactor as an example:

[0041] When an exothermic reaction occurs, Figure 1 As shown, the heat transfer fluid flows into the heat transfer fluid heat exchange chamber 8 of the entire device through the heat transfer fluid inlet channel 10 processed on the corresponding plate surface, and flows out of the heat transfer fluid outlet channel 11 from the lower inlet and the upper outlet, thereby effectively exchanging heat with the CaO solid particles in the thermochemical reaction chamber 7, and the purpose of regulating the reaction temperature inside the thermochemical reaction chamber 7 can be achieved by controlling the temperature and flow of the heat transfer fluid. At the same time, water vapor that reacts with the CaO solid particles in the gas-solid phase is generated from an external device, and is input into the gas buffer area formed by the porous gas distribution plate 1 through the gas reactant channel 9 on the corresponding plate surface, and then uniformly dispersed into the thermochemical reaction chamber 7 through the fine mesh 2, and fully contacts and reacts with the CaO solid particles at a set temperature such as 550°C, generating Ca(OH)2 and releasing a large amount of heat to supply the heat transfer fluid, completing the process of rapid heat release.

[0042] When an endothermic reaction occurs, Figure 1 As shown in the figure, the heat transfer fluid flows into the heat transfer fluid inlet channel 10 processed on the corresponding plate surface, and flows out of the heat transfer fluid heat exchange chamber 8 of the entire device from the upper inlet and lower outlet of the heat transfer fluid outlet channel 11, thereby supplying heat to the Ca(OH)2 solid particles in the thermochemical reaction chamber 7; at the same time, the water vapor generated by the decomposition of the Ca(OH)2 solid particles passes through the fine mesh 2 into the gas buffer area formed by the porous gas distribution plate 1, and then flows out of the device through the gas reactant channel 9, generating CaO and absorbing a large amount of heat supplied by the heat transfer fluid, completing the process of rapid heat storage.

[0043] In addition, by fine-tuning the structure of the thermochemical reaction chamber 7 and connecting corresponding gas or solid inlet and outlet channels, it can also be transformed into a fluidized bed or moving bed type thermochemical energy storage device, thereby expanding the use function of the device.

[0044] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency plate-type thermochemical energy storage reactor, characterized in that: It comprises a porous gas distribution plate (1), a fine mesh (2), an enhanced heat exchange plate (3), an inlet and outlet side cover plate (4), a non-inlet and outlet side cover plate (5), a gas transport layer (6), a thermochemical reaction chamber (7), a heat transfer fluid heat exchange chamber (8), a gas reactant channel (9), a heat transfer fluid inlet channel (10) and a heat transfer fluid outlet channel (11); Two porous gas distribution plates (1) are symmetrically arranged, two fine meshes (2) are symmetrically arranged on the outside of the two porous gas distribution plates (1), and two enhanced heat exchange plates (3) are symmetrically arranged on the outside of the two fine meshes (2); a gas transport layer (6) is formed between the two porous gas distribution plates (1); the outside of the porous gas distribution plates (1) and the inside of the fine mesh (2) are in close contact; a thermochemical reaction chamber (7) is formed between the outside of the fine mesh (2) and the trough-type thermochemical energy storage structure on the inside of the enhanced heat exchange plate (3); the outsides of the enhanced heat exchange plates (3) at the head and tail are respectively in contact with the inlet and outlet ports. A heat transfer fluid heat exchange cavity (8) is formed between the side cover plate (4) and the non-inlet and outlet side cover plate (5); a gas reactant channel (9), a heat transfer fluid inflow channel (10), and a heat transfer fluid outflow channel (11) are formed by stacking the above-mentioned porous gas distribution plate (1), the fine mesh (2), the enhanced heat exchange plate (3), and the circular holes opened on the inlet and outlet side cover plate (4); wherein the gas reactant channel (9) is only connected to the gas transport layer (6), and the heat transfer fluid inflow channel (10) and the heat transfer fluid outflow channel (11) are only connected to the heat transfer fluid heat exchange cavity (8); The plate surface structure edge positions of the porous gas distribution plate (1), the fine mesh (2) and the two sides of the rectangular enhanced heat exchange plate (3) are consistent, and circular holes of the same size for the heat transfer fluid and the reaction gas to pass through are opened at the same position; the circular holes of the three are aligned with each other; The circular holes of the gas reactant channel (9) are located on the same projection plane; The circular holes of the heat transfer fluid inflow channel (10) are located on the same projection plane; The circular holes of the heat transfer fluid outflow channel (11) are located on the same projection plane; The porous gas distribution plates (1) all have raised edges that are 90 degrees to the plate surface, and the raised edges of the two porous gas distribution plates (1) are aligned and placed together to form a gas transport layer (6) having a bottom surface shape consistent with that of the porous gas distribution plates (1) and having a certain thickness; The porous gas distribution plate (1) is used to organize the gas flow of the gaseous reactants so that the gaseous reactants enter the thermochemical reaction chamber (7) uniformly in the normal direction of the porous gas distribution plate (1).

2. A high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The circular hole has the same cross-sectional shape and size as the gas reactant channel (9), the heat transfer fluid inflow channel (10), and the heat transfer fluid outflow channel (11).

3. A high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The thermochemical reaction chamber (7) is used to load solid particle reactants to carry out thermochemical energy storage or energy release reactions. The mesh size of the fine mesh (2) should be smaller than the diameter of the reacting solid particles, so as to restrict the solid particle reactants in the thermochemical reaction chamber (7) from entering the gas transport layer (6), while ensuring that the gas reactants enter the thermochemical reaction chamber (7) from the gas transport layer (6).

4. A high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The fine mesh (2) is closely attached to the outer side of the porous air distribution plate, and its mesh size is smaller than the diameter of the solid reaction particles in the thermochemical reaction chamber, so as to prevent the solid reaction particles from leaking from the thermochemical reaction chamber.

5. A high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The inner plate surface of the enhanced heat exchange plate (3) is processed with a groove structure for filling solid materials, which is used to stack itself to form a thermochemical reaction chamber; the outer plate surface is processed with a corrugated fin structure for flowing heat transfer fluid, which is used to stack itself to form a heat transfer fluid heat exchange chamber. The thickness between the structures on both sides of the plate surface is very small, which can reduce the heat transfer resistance between the two and further enhance the heat exchange between the reactants and the heat transfer fluid. In addition, the enhanced heat exchange plate (3) can expand the scale of the reaction device by periodically stacking itself.

6. A high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The non-inlet and outlet side cover plate (5) has no holes and is used to change the flow direction of the heat transfer fluid so that it flows back to the outlet end on the side of the inlet end; The inlet and outlet side cover plates (4) and the non-inlet and outlet side cover plates (5) are used to fix the periodically stacked enhanced heat exchange plates (3), and the heat transfer fluid heat exchange cavities (8) on the inlet and outlet side cover plates (4) and the non-inlet and outlet side cover plates (5) are in contact with the heat transfer fluid heat exchange cavities (8) of the enhanced heat exchange plates (3).

7. A high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The porous air distribution plate (1), the fine mesh (2), and the enhanced heat exchange plate (3) are basic structural units, and the scale is expanded in a periodic stacking manner by increasing the number of the basic structural units.

8. The high-efficiency plate-type thermochemical energy storage reactor according to claim 1, characterized in that: The gas transport layer (6) is formed between the two porous gas distribution plates (1) and is used to improve the distribution of the reaction gas entering the thermochemical reaction chamber (7) to achieve a uniform reaction; The heat transfer fluid heat exchange cavity (8) is a corrugated fin structure, used to provide or absorb heat for thermochemical reactions; The gas reactant channel (9) is used for inputting gas reactants or outputting gas products, and the heat transfer fluid inflow channel (10) and the heat transfer fluid outflow channel (11) provide corresponding inlet and outlet channels for the heat transfer fluid; The gas reactant channel (9) and the heat transfer fluid inflow channel (10) are located above the plate, and the heat transfer fluid inflow channel (10) is located below the plate.

Images