Thermochemical energy accumulator and heat exchange system

Abstract

The utility model relates to the technical field of thermal energy storage equipment, in particular to a thermochemical energy accumulator and a heat exchange system. A thermochemical energy storage device comprises a sealing shell which comprises a shell, a first end socket and a second end socket which are arranged in a penetrating mode, the first end socket and the second end socket are fixedly connected with the two ends of the shell respectively to form a containing space, and through holes are formed in the first end socket and the second end socket respectively; the gas branch pipe is arranged on the shell wall of the shell, the gas branch pipe is communicated with the shell, and the gas branch pipe is suitable for being filled with reaction gas; the reaction plate is arranged in the accommodating space, at least one side of the reaction plate is provided with a reaction tank, the reaction tank is suitable for accommodating a thermochemical energy storage material, the reaction plate is internally provided with a heat exchange flow channel, and the heat exchange flow channel is respectively communicated with the through holes of the first end socket and the second end socket. The utility model solves the problems that the diffusion and permeation of reactant gas phase are not facilitated and the efficiency of transferring to fluid is low because a material bracket is mostly filled in a thermochemical heat storage reactor.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal energy storage equipment, in particular to a thermochemical energy storage device and a heat exchange system. Background Art

[0002] At present, the main conventional heat energy source for human beings is the combustion of fossil fuels. As an important material basis for human survival and development, the use of fossil energy such as coal, oil, and natural gas has accompanied the progress of human civilization and the development of social economy. However, due to the non-renewable nature of fossil energy and the sharp increase in consumption, it is gradually becoming exhausted. In order to seek a more stable energy source to get rid of the limitations of fossil energy, new energy has become a new development direction. The development and utilization of green energy (solar energy, wind energy, ocean energy, geothermal energy) is an effective way to solve the current energy crisis. It is of great significance in replacing traditional energy, improving pollution emissions, and broadening the scope of energy utilization. Among them, solar energy, as a renewable clean energy that can be applied to fields such as refrigeration and heat storage, has received increasing attention. In order to further improve the utilization efficiency of the energy system and improve the matching characteristics of the user end, energy storage methods such as sensible heat, latent heat, and thermochemical are widely used, and are applied to different occasions according to the different energy storage temperature ranges and energy storage densities.

[0003] As a highly efficient heat storage method, thermochemical energy storage technology has the characteristics of high energy storage density, wide operating temperature range, long storage time, and mobile heat storage / heat supply. It has been widely used in waste heat recovery and other fields, and can significantly improve the quality of thermal energy. However, the thermochemical energy storage system has high requirements for heat transfer effects during the charging and discharging process. Thermochemical heat storage reactors with general structures such as overall cylindrical or trough types are mostly filled with materials directly into the reactor. This makes the solid energy storage material densely stacked due to its own gravity, which is not conducive to the diffusion and penetration of the reactant gas phase, and the efficiency of transfer to the fluid is low. The overall poor heat transfer performance inside the reactor exacerbates the problem of unbalanced temperature distribution of the entire device and weakens the reaction performance. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the thermochemical heat storage reactor in the prior art mostly uses material brackets to fill the interior of the reactor, which is not conducive to the diffusion and penetration of the reactant gas phase and the low efficiency of transfer to the fluid, thereby providing a thermochemical energy storage device, heat exchange system and use method.

[0005] In order to solve the above problems, the utility model provides a thermochemical energy storage device, comprising:

[0006] A sealing shell, the sealing shell comprising a shell, a first end cap and a second end cap which are arranged through each other, the first end cap and the second end cap are respectively fixedly connected to two ends of the shell to form a receiving space, and the first end cap and the second end cap are respectively provided with a through hole;

[0007] A gas branch pipe is arranged on the shell wall of the shell, the gas branch pipe is connected with the shell, and the gas branch pipe is suitable for filling with reaction gas;

[0008] A reaction plate is arranged in the accommodating space, and a reaction groove is provided on at least one side of the reaction plate. The reaction groove is suitable for accommodating thermochemical energy storage materials. A heat exchange flow channel is provided in the reaction plate, and the heat exchange flow channel is respectively connected with the through holes of the first head and the second head.

[0009] Optionally, reaction grooves are respectively provided on both sides of the reaction plate, and a spoiler column is provided between the reaction grooves on both sides, and the spoiler column is arranged in the heat exchange flow channel.

[0010] Optionally, the length direction of the reaction plate is consistent with the length direction of the shell, and the shell is cylindrical.

[0011] Optionally, buffer tanks are provided at both ends of the reaction plate along the length direction, the buffer tanks are connected to the heat exchange channel through a fluid branch pipe, and a connecting pipe is provided at one end of the buffer tank away from the fluid branch pipe, and the connecting pipe is connected to the through hole.

[0012] Optionally, a support plate is provided between adjacent reaction tanks on the same side, and the surface of the thermochemical energy storage material is also covered with a breathable mesh layer.

[0013] Optionally, it also includes an electric heating rod, which is buried in the reaction tank.

[0014] A heat exchange system comprises the above-mentioned thermochemical energy storage device.

[0015] Optionally, it also includes a vacuum pump, a steam generator, a fluid pump, a heat exchanger, a cooler, a liquid inlet pipeline and a liquid outlet pipeline. The two ends of the sealed shell are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline, the gas branch pipe is connected to the gas main pipe, and the vacuum pump, cooler and steam generator are respectively connected to the gas main pipe through pipelines.

[0016] The technical solution of the utility model has the following advantages:

[0017] 1. The thermochemical energy storage device provided by the utility model includes: a sealed shell, including a shell, a first end cap and a second end cap which are arranged through each other, the first end cap and the second end cap are respectively fixedly connected to two ends of the shell to form a receiving space, and the first end cap and the second end cap are respectively provided with through holes; a gas branch pipe is arranged on the shell wall of the shell, the gas branch pipe is arranged through the shell, and the gas branch pipe is suitable for filling with reaction gas; a reaction plate is arranged in the receiving space, at least one side of the reaction plate is provided with a reaction groove, the reaction groove is suitable for accommodating thermochemical energy storage materials, and a heat exchange flow channel is arranged in the reaction plate, and the heat exchange flow channel is respectively arranged through the through holes of the first end cap and the second end cap. First, the storage space in the shell is evacuated through the gas branch pipe, and then the reaction gas is introduced into the shell through the gas branch pipe so that the reaction gas fills the entire storage space. The reaction gas reacts with the thermochemical energy storage material, and the heat exchange fluid enters the fluid through the through hole of the first head, and the fluid exchanges heat through the flow channel and then flows out of the through hole of the second head, or the fluid enters through the through hole of the second head, and the fluid exchanges heat through the heat exchange flow channel and then flows out of the through hole of the first head. By accommodating the thermochemical energy storage material in the reaction tank, the gas reacts with the thermochemical energy storage material, so that the gas is distributed throughout the shell, and the heat release or heat absorption in the reaction tank is achieved, and the temperature rises or drops after flowing through the heat exchange flow channel. Since the gas reacts fully with the thermochemical energy storage material, the heat is quickly and fully exchanged in the shell, which ensures the temperature balance in the shell and can also increase the reaction rate.

[0018] 2. The thermochemical energy storage device provided by the utility model has reaction grooves on both sides of the reaction plate, and spoiler columns are provided between the reaction grooves on both sides. The spoiler columns are provided in the heat exchange flow channel. The reaction grooves on both sides can improve the efficiency of the reaction. The provision of spoiler columns can enhance the strength of the heat exchange flow channel inside the reaction plate on the one hand, and enhance the heat exchange capacity between the fluid in the heat exchange flow channel and the reaction groove on the other hand.

[0019] 3. In the thermochemical energy storage device provided by the utility model, the length direction of the reaction plate is consistent with the length direction of the shell, and the shell is cylindrical, so that the reaction plate is arranged along the length direction of the shell so that the reaction groove of the reaction plate is in contact with the air as much as possible.

[0020] 4. The thermochemical energy storage device provided by the utility model has buffer tanks at both ends of the reaction plate along the length direction, the buffer tank is connected to the heat exchange flow channel through a fluid branch pipe, and a connecting pipe is provided at one end of the buffer tank away from the fluid branch pipe, and the connecting pipe is connected to the through hole. The connecting pipe is connected to the head, so that the fluid passes through the connecting pipe to the bottom buffer tank, and then enters the heat exchange flow channel from the buffer tank through the fluid branch pipe.

[0021] 5. The thermochemical energy storage device provided by the utility model has a support plate between adjacent reaction tanks on the same side, and the surface of the thermochemical energy storage material is also covered with a breathable mesh layer. The support plate can improve the overall structural strength of the reaction plate, and the breathable mesh layer can prevent the thermochemical energy storage material from flowing out, and can also allow gas molecules to pass through to react with the thermochemical energy storage material.

[0022] 6. The thermochemical energy storage device provided by the utility model also includes an electric heating rod, which is buried in the reaction tank. When heat absorption is required, the electric heating rod is heated to provide heat for the thermochemical energy storage material to achieve heat absorption.

[0023] 7. The heat exchange system provided by the utility model includes the above-mentioned thermochemical energy storage device, and also includes a vacuum pump, a steam generator, a fluid pump, a heat exchanger, a cooler, a liquid inlet pipeline and a liquid outlet pipeline. The two ends of the sealed shell are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline, the gas branch pipe is connected to the gas main pipe, and the vacuum pump, the cooler and the steam generator are respectively connected to the gas main pipe through pipelines to form a heat exchange system to achieve the functions of heat absorption and heat release. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a thermochemical energy storage device provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of a reaction plate provided in an embodiment of the utility model;

[0027] Figure 3 A front view of a reaction plate provided in an embodiment of the utility model;

[0028] Figure 4 A cross-sectional schematic diagram of a thermochemical energy storage device provided in an embodiment of the utility model;

[0029] Figure 5 Another cross-sectional schematic diagram of a thermochemical energy storage device provided in an embodiment of the utility model;

[0030] Figure 6 It is a schematic diagram of a heat exchange system provided in an embodiment of the present utility model.

[0031] Explanation of the reference numerals: 1. Shell; 2. Breathable mesh layer; 3. Reaction tank; 4. Support plate; 5. Heat exchange channel; 6. Connecting pipe; 7. Buffer tank; 8. Gas branch pipe; 9. Baffle column; 10. First end cap; 11. Electric heating rod; 12. Second end cap; 13. Fluid pump; 14. Flow meter; 15. Preheater; 16. Sealed shell; 17. Heat exchanger; 18. Water tank; 19. Cooler; 20. Vacuum pump; 21. Fluid branch pipe; 22. Liquid inlet pipeline; 23. Liquid outlet pipeline; 24. Gas main pipe; 25. Steam generator. DETAILED DESCRIPTION

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] like Figure 1 A specific implementation method of the thermochemical energy storage device shown in -6 includes: a sealed shell 16, a reaction plate arranged in the sealed shell 16, and a gas branch pipe 8 arranged on the shell wall of the sealed shell 16.

[0037] like Figure 1As shown, the sealing shell 16 includes a shell 1, a first end cap 10 and a second end cap 12 which are arranged through each other, wherein the first end cap 10 and the second end cap 12 are respectively fixedly connected to both ends of the shell 1 by bolts, and the first end cap 10 and the second end cap 12 are respectively provided with through holes. Figure 1 As shown, the shell 1 is circular, and a sealed accommodation space is formed by the shell 1, the first end cap 10 and the second end cap 12. The shell 1 is wrapped with heat insulation cotton and a heating belt, and a thermometer is arranged inside the shell 1.

[0038] like Figure 1 As shown, three gas branch pipes 8 are provided on the side wall of the shell 1 of the sealed shell 16 , and each gas branch pipe 8 is respectively connected to the shell 1 .

[0039] like Figure 2 , Figure 3 , Figure 4 As shown, the reaction plate is arranged in the sealed shell 16, and the length direction of the reaction plate is consistent with the length direction of the shell 1, that is, the reaction plate is arranged along the length direction of the shell 1, and a reaction tank 3 is respectively provided on both sides of the reaction plate, and a heat exchange flow channel 5 is provided between the two reaction tanks 3. A plurality of spoiler columns 9 with circular cross sections are provided in the heat exchange flow channel 5, and the spoiler columns 9 are used to connect the two heat exchange flow channels 5, and the length direction of the reaction tank 3 is consistent with the length direction of the shell 1. Figure 2 , Figure 3 As shown, buffer tanks 7 are provided at both ends of the reaction plate along the length direction, and the buffer tank 7 is connected to the heat exchange flow channel 5 through a fluid branch pipe 21. A connecting pipe 6 is provided at one end of the buffer tank 7 away from the fluid branch pipe 21, and the connecting pipe 6 is connected to the through hole. It should be noted that Figure 3 As shown, one connecting pipe 6 of the reaction plate is longer than the other connecting pipe 6. The reason is that the shorter connecting pipe 6 is a steel pipe, which is fixedly connected to the end cap, and the longer connecting pipe 6 is a metal hose. The metal hose has a surplus length, which is convenient for pulling during the removal process. After the end cap is separated from the shell 1, a gap exists between the end cap and the shell 1 due to the separation of the metal hose, which facilitates the separation of the metal hose from the end cap. Figure 2 , Figure 3 , Figure 4 As shown, a support plate 4 is provided between adjacent reaction tanks 3 on the same side of the reaction plate, and the reaction tank 3 contains a thermochemical energy storage material, and the surface of the thermochemical energy storage material is also covered with a breathable mesh layer 2. It should be noted that the reaction tank 3 needs to be treated with corrosion protection when necessary. Specifically, the thermochemical energy storage material is CaO particles. In addition, an electric heating rod 11 is also buried in the reaction tank 3 on each side.

[0040] A heat exchange system includes the above-mentioned thermochemical energy storage device, and also includes a vacuum pump 20, a steam generator 25, a fluid pump 13, a heat exchanger 17, a cooler 19, a liquid inlet pipeline 22 and a liquid outlet pipeline 23, wherein the two ends of the sealed shell 16 are respectively connected to the liquid inlet pipeline 22 and the liquid outlet pipeline 23, and the gas branch pipe 8 is connected to the gas main pipe 24. Figure 6 As shown, the direction of the liquid inlet pipeline 22 toward the thermochemical energy storage device is provided with a fluid pump 13, a flow meter 14, and a preheater 15 in sequence, and the liquid outlet pipeline 23 is provided with a heat exchanger 17. Figure 6 As shown, the vacuum pump 20 , the cooler 19 and the steam generator 25 are connected to the gas main pipe 24 through pipelines respectively, and solenoid valves are provided on the pipelines of the vacuum pump 20 , the cooler 19 and the steam generator 25 respectively, wherein the cooler 19 is also connected to the water tank 18 .

[0041] In order to realize automatic control, a controller is also included, and the controller is respectively connected with the vacuum pump 20, the fluid pump 13, the cooler 19, the thermometer, the steam generator 25, the solenoid valve and other lines.

[0042] A method for using a heat exchange system comprises the following steps:

[0043] 1) Exothermic mode, fill the reaction tank 3 with CaO particles, turn on the heating belt outside the cylinder to preheat the shell 1 to a preset temperature, turn on the vacuum pump 20 and the solenoid valve on the pipeline where the vacuum pump 20 is located, evacuate the shell 1 through the gas branch pipe 8, close the vacuum pump 20 and the solenoid valve on the pipeline where the vacuum pump 20 is located, turn on the steam generator 25 and the solenoid valve on the pipeline where the steam generator 25 is located, and the steam generator 25 generates water vapor that enters the shell 1 through the gas branch, and the water vapor fills the entire shell 1. Due to the vacuum in the shell 1, the saturated water vapor reacts with the CaO particles through the air-permeable mesh layer 2. In this process, Ca(OH)2 is generated and a large amount of heat is released. The heat also enters the heat exchange channel 5. The heat exchange fluid is powered by the power pump and enters the heat exchange channel 5 through the liquid inlet pipeline 22. After being heated by the heat released by the reaction in the heat exchange channel 5, a heat flow is formed, which is collected by the buffer tank 7 and reaches the liquid outlet pipeline 23, thereby completing the rapid heat replacement;

[0044] 2) In the endothermic mode, the vacuum pump 20 and the electromagnetic valve on the pipeline where the vacuum pump 20 is located are opened, and the shell 1 is evacuated through the gas branch pipe 8. The vacuum pump 20 and the electromagnetic valve on the pipeline where the vacuum pump 20 is located are closed, and the electric heating rod 11 is turned on to heat the Ca(OH)2 in the reaction tank 3. The generated water vapor enters the shell 1 through the air permeable mesh layer 2, and then enters the cooler 19 through the gas branch pipe 8. The Ca(OH)2 absorbs heat to generate CaO particles to complete energy storage.

[0045] As an alternative embodiment, the housing 1 may also be in other shapes such as a rectangle.

[0046] As an alternative embodiment, the cross section of the spoiler column 9 may also be other shapes such as a rectangle.

[0047] As an alternative embodiment, in the endothermic mode, heating may not be performed by the electric heating rod 11, but by introducing waste heat fluid, in which the waste heat fluid with a higher temperature enters the heat exchange channel 5, so that Ca(OH)2 is absorbed to generate CaO particles. The source of the waste heat fluid may be high-temperature flue exhaust, waste heat from wastewater and exhaust gas, etc.

[0048] As an alternative implementation, Figure 5 As shown, multiple reaction plates may be arranged in the shell 1 to increase the heat storage capacity, and a certain gap is left between the plates to ensure that the reaction gas reacts with the thermochemical energy storage material.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A thermochemical energy storage device, characterized in that: include: A sealing shell (16), the sealing shell (16) comprising a shell (1), a first seal head (10) and a second seal head (12) which are arranged through-through, the first seal head (10) and the second seal head (12) being respectively fixedly connected to two ends of the shell (1) to form a receiving space, and the first seal head (10) and the second seal head (12) are respectively provided with through holes; A gas branch pipe (8) is arranged on the shell wall of the shell (1), the gas branch pipe (8) and the shell (1) are connected, and the gas branch pipe (8) is suitable for filling with reaction gas; A reaction plate is arranged in the accommodating space, a reaction groove (3) is arranged on at least one side of the reaction plate, the reaction groove (3) is suitable for accommodating thermochemical energy storage materials, a heat exchange flow channel (5) is arranged in the reaction plate, and the heat exchange flow channel (5) is respectively connected to the through holes of the first head (10) and the second head (12).

2. Thermochemical energy storage device according to claim 1, characterized in that Reaction grooves (3) are respectively provided on both sides of the reaction plate, and a spoiler column (9) is provided between the reaction grooves (3) on both sides. The spoiler column (9) is arranged in the heat exchange flow channel (5).

3. The thermochemical energy storage device according to claim 1, characterized in that The length direction of the reaction plate is consistent with the length direction of the shell (1), and the shell (1) is cylindrical.

4. Thermochemical energy storage device according to claim 2, characterized in that Buffer tanks (7) are respectively provided at both ends of the reaction plate in the length direction; the buffer tank (7) is connected to the heat exchange flow channel (5) via a fluid branch pipe (21); a connecting pipe (6) is provided at one end of the buffer tank (7) away from the fluid branch pipe (21); the connecting pipe (6) is connected to the through hole.

5. Thermochemical energy storage device according to claim 4, characterized in that A support plate (4) is provided between adjacent reaction tanks (3) on the same side, and the surface of the thermochemical energy storage material is also covered with a breathable mesh layer (2).

6. Thermochemical energy storage device according to claim 5, characterized in that It also comprises an electric heating rod (11), wherein the electric heating rod (11) is buried in the reaction tank (3).

7. A heat exchange system, characterized in that: A thermochemical energy storage device comprising any one of claims 1 to 6.

8. The heat exchange system according to claim 7, characterized in that: The invention also comprises a vacuum pump (20), a steam generator (25), a fluid pump (13), a heat exchanger (17), a cooler (19), a liquid inlet pipeline (22) and a liquid outlet pipeline (23); the two ends of the sealed shell (16) are respectively connected to the liquid inlet pipeline (22) and the liquid outlet pipeline (23); the gas branch pipe (8) is connected to a gas main pipe (24); and the vacuum pump (20), the cooler (19) and the steam generator (25) are respectively connected to the gas main pipe (24) through pipelines.

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