CN111781239B - A high-efficiency closed thermochemical adsorption heat storage test system - Google Patents

Abstract

The invention discloses a high-efficiency closed thermochemical adsorption heat storage test system, which comprises a reactor with a high-efficiency heat exchange effect, and further comprises an evaporation/condenser, a vacuum pump, a high-temperature thermostat and a low-temperature thermostat, wherein the two thermostats can control the adsorption, desorption and the storage of the thermochemical adsorption heat storage process and the heating and cooling of the evaporation/condenser in each stage through the opening and closing of a valve to complete the high-efficiency test of thermochemical heat charging and heat release. The invention has the advantages of simple structural design, visual operation, low manufacturing cost, high efficiency and convenience in testing and good safety performance.

Description

A high-efficiency closed thermochemical adsorption heat storage test system

technical field

The invention relates to the technical field of energy storage, in particular to a highly efficient closed thermochemical adsorption heat storage test system.

Background technique

In the 2012 "Twelfth Five-Year Special Plan for the Development of Solar Power Generation Science and Technology" issued by the Ministry of Science and Technology, it will "break through the application technology of solar medium-temperature thermal energy in industrial energy conservation and the long-term heat storage technology of solar building heating, and demonstrate the application" as an important development goal. The Development and Reform Energy (2017) No. 1701 document pointed out that it supports the development of various forms of energy storage, output and utilization of renewable energy such as power storage and heat storage in areas where the consumption of renewable energy is prominent.

Energy storage research is a strategic issue for energy security and sustainable development, in which thermal energy storage and utilization are closely related to people's livelihood. With the development of the economy and the increase of the population, residents have higher and higher requirements for the comfort of buildings, and the energy consumption has also increased. Statistics show that my country's building energy consumption accounts for about 30% of the total energy consumption of the society, of which energy consumption for cooling, heating and domestic hot water accounts for 20-30% of the total building energy consumption. For cities and towns in northern my country, only heating energy consumption accounts for 36% of the total energy consumption. Thermal energy storage technology can store temporarily unused or redundant thermal energy through a certain medium, and release it when needed. Compared with the storage of mechanical energy and electrical energy, thermal energy storage technology has the advantages of low cost, large capacity, suitable for green buildings and solar collectors, etc.

The development and application of high-efficiency heat storage technology can not only solve the problem of waste heat utilization, reduce the consumption of electricity and fossil energy, but also reduce the thermal pollution of the environment. And it can effectively solve the problem of mismatching energy supply in terms of time, space and intensity. Thermochemical heat storage is to store and release energy through reversible chemical reactions and the mutual conversion of thermal energy and chemical energy. The principle is as follows :

Storage solar energy can be stored during the day and used at night; or stored across seasons, stored in summer and used in winter. The working principle of the thermochemical energy storage system mainly includes three stages: heat charging, heat storage, and heat release. In the heat charging stage, the inorganic salt hydrate absorbs heat, and water vapor is removed from the hydrate; in the heat storage stage, the dehydrated inorganic matter is sealed and stored; in the heat release stage, the inorganic salt absorbs water vapor and releases the stored heat. Since the process is a reversible thermochemical reaction, the chemical heat stored and released is large. This heat storage technology has a high heat storage density, which is about 10-20 times that of the traditional sensible heat storage technology and phase change latent heat technology, and the heat storage loss is small. , long-term storage, small temperature fluctuations in the exothermic process, and reusable advantages, so more and more attention has been paid to it and it has a wide range of application prospects.

In order to ensure the experimental and test results of heat storage materials, corresponding test equipment is needed. However, the existing heat storage test equipment has a complicated structural design and high manufacturing cost, and it is necessary to complete the three stages of heat charging, heat storage and heat release at the same time. The operation process is cumbersome, and the test items cannot be completed quickly and accurately.

Contents of the invention

The object of the present invention is to solve the above problems, and to design a highly efficient closed thermal chemical adsorption heat storage test system.

The technical solution of the present invention to achieve the above object is a high-efficiency closed thermochemical adsorption heat storage test system, including a high-temperature thermostat, a low-temperature thermostat and an evaporation/condenser, and the outlet of the low-temperature thermostat is connected with the evaporation through a pipeline. The fluid inlet of the condensing pipe in the /condenser is connected, the fluid outlet of the condensing pipe in the evaporator/condenser is connected with the inlet of the cryostat through a pipeline, and the outlet of the high temperature thermostat is connected with the condensing pipe in the evaporator/condenser through a pipeline The fluid inlet is connected, and the fluid outlet of the condensation pipe in the evaporation/condenser is connected with the inlet of the high temperature thermostat through a pipeline,

A valve E is installed on the pipeline connecting the outlet of the cryostat to the fluid inlet of the condensing pipe in the evaporator/condenser, and a valve F is installed on the pipeline connecting the fluid outlet of the condensing pipe in the evaporator/condenser to the inlet of the cryostat. A valve C is installed on the pipeline connecting the outlet of the high temperature thermostat to the fluid inlet of the condensing pipe in the evaporator/condenser, and a valve D is installed on the pipeline connecting the fluid outlet of the condensing pipe in the evaporator/condenser to the inlet of the high temperature thermostat;

Also includes a reactor, the reactor includes an insulated box, a visible window is arranged on the insulated box, a reactor fluid outlet and a reactor fluid inlet are arranged on the insulated box, and the insulated box is fixedly installed Several heat exchange structures, several heat exchange structures are arranged in the insulated box from front to back, the heat exchange structure is composed of a rectangular mesh box, a serpentine coil installed in the mesh box and filled in The heat storage material between the rectangular mesh box and the serpentine coil; the heat exchange structure located in the front of the heat preservation box, one end of the serpentine coil inside it is connected to the fluid outlet of the reactor; the The last heat exchange structure in the insulation box, one end of the inner serpentine coil is connected to the fluid inlet of the reactor; the two adjacent heat exchange structures in the insulation box, the inner serpentine coil through the coil joint connection;

The outlets of the high temperature thermostat and the low temperature thermostat are all connected to the reactor fluid inlet through pipelines, and the inlets of the high temperature thermostat and the low temperature thermostat are connected to the reactor fluid outlet through pipelines. It is connected with the inner cavity of the evaporator/condenser through a steam pipeline, and a vacuum pump and a vacuum valve are installed on the steam pipeline;

A valve A is installed on the pipeline connected between the outlet of the high temperature thermostat and the reactor fluid inlet, a valve B is installed on the pipeline connected between the high temperature thermostat inlet and the reactor fluid outlet, and the outlet of the low temperature thermostat is connected to the reactor fluid inlet. A valve G is installed on the connecting pipeline, and a valve H is installed on the pipeline connecting the inlet of the cryostat and the fluid outlet of the reactor.

The heat storage material is an adsorption heat storage material composed of a porous material and a water-absorbing inorganic salt.

The porous material is one or more composites of expanded graphite, activated carbon or silica gel.

The water-absorbing inorganic salt is selected from the combination of strong water-absorbing inorganic salt and moderately water-absorbing inorganic salt, and the combination method includes LaCl ₃ /LiCl, LaCl ₃ /CaCl ₂ , MgSO ₄ /LiCl or MgSO ₄ /CaCl ₂ .

There are three heat exchange structures in the heat preservation box, and the distance between two adjacent heat exchange structures is 20-30 mm.

In the heat exchange structure, the ports at both ends of the serpentine coil extend out of the rectangular mesh box, and the ports of the serpentine coil extending out of the rectangular mesh box are connected to the coil interface, the reactor fluid outlet or the reactor fluid inlet .

A distance of 10-20mm is maintained between the rectangular mesh box and the inner surface of the heat preservation box.

A thermocouple is installed at the steam inlet of the evaporator/condenser, a thermocouple is installed at the fluid outlet of the condensing tube of the evaporator/condenser and the fluid inlet of the condensing tube, and a detector internal air pressure is also installed on the evaporator/condenser Pressure sensor: thermocouples are installed at the outlet of the reactor fluid and the inlet of the reactor fluid, and a thermocouple for detecting its internal temperature and a pressure sensor for detecting its internal pressure are also installed on the insulated box, the thermocouple and The pressure sensors are all connected with the data acquisition instrument and transmit signals to the data acquisition instrument.

A liquid flowmeter is installed at the outlet of the cryostat and the high temperature thermostat, and the liquid flowmeter is connected with the data acquisition instrument and transmits signals to the data acquisition instrument.

The data acquisition instrument is connected with a computer.

Beneficial effect

The high-efficiency closed thermochemical adsorption heat storage test system produced by the technical solution of the present invention has the following advantages:

(1) The heat storage equipment is simple and easy: only two temperature control devices, a high temperature thermostat and a low temperature thermostat, are installed, and the heating and cooling process of the reactor and the evaporator/condenser are controlled through the opening and closing of the valve and the pipeline, and the completion The process of charging, storing and releasing heat;

(2) It is convenient to test the energy efficiency of the heat storage medium: through the closed cycle and various temperature sensors, as well as the liquid level test line of the evaporator/condenser, it is convenient and accurate to test the charge and release heat of the heat storage material, and heat storage Density and other performance parameters;

(3) The structure of the reactor is simple, which can not only fix the heat storage material to prevent falling off, but also greatly increase the heat exchange area, and the heat exchange effect is good;

(4) Good structural stability: thermochemical adsorption heat storage has no moving parts, adopts solid-gas adsorption, simple and stable structure, and good shock resistance;

(5) Higher safety: the heat storage material is inorganic salt/porous material, and the gas absorbing substance is water vapor, both of which are non-toxic and harmless to the environment;

(6) Wide range of applications: rural houses have large areas and low floors, and the roof can be used as a place to collect solar energy. Solar panels can also keep the room warm; low-temperature waste heat can be applied to various types of factories for heating/heating of factory buildings and dormitories water demand;

(7) Economical manufacturing cost: heat storage materials are inorganic salt/porous materials with wide sources and low prices, and heat storage materials can be recycled to meet the economic conditions of most ordinary families;

(8) Low energy consumption in operation: The thermochemical adsorption heat storage device can use solar energy or low-temperature waste heat as a heat source, which meets the energy-saving and emission-reduction requirements advocated by my country.

Description of drawings

Fig. 1 is the structural representation of efficient closed thermochemical adsorption heat storage test system of the present invention;

Fig. 2 is the schematic diagram of the structure of the high-efficiency closed thermochemical adsorption heat storage test system of the present invention after removing the thermocouple, liquid flow meter, data acquisition instrument and computer

Fig. 3 is the front view of the heat exchange structure of the present invention;

Fig. 4 is a right view of the heat exchange structure of the present invention;

Fig. 5 is a top view of the heat exchange structure of the present invention;

Fig. 6 is a schematic structural view of the serpentine coil of the present invention arranged in a rectangular mesh box; in the figure, 1, a high temperature thermostat; 2, a low temperature thermostat; 3, an evaporation/condenser; 4, a fluid inlet of a condensation pipe ;5, fluid outlet of condensation pipe; 6, valve E; 7, valve F; 8, valve C; 9, valve D; 10, reactor; 11, insulation box; 12, reactor fluid outlet; 13, reactor Fluid inlet; 14. Rectangular mesh box; 15. Serpentine coil; 16. Heat storage material; 17. Steam pipeline; 18. Vacuum pump; 19. Vacuum valve; 20. Valve A; 21. Valve B; 22. Valve G; 23. Valve H; 24. Data acquisition instrument; 25. Computer.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings. As shown in Figures 1-6, the inventive point of the present application is that the entire device is composed of a reactor, an evaporation/condenser, a cold and heat source system, and the like. The core component is the heat exchange structure in the reactor, which is a modular heat storage structure with a rectangular parallelepiped shape, surrounded by a leak-proof net, and filled with heat storage materials. In order to facilitate the heating of the heat storage materials, in the reactor Serpentine coil heat exchangers are arranged to increase the heat exchange area and reduce the thermal resistance in the heat conversion process.

The whole device is a closed thermal chemical adsorption heat storage system, which can effectively use solar energy for inter-season heat storage or short-term heat storage, as well as heat storage for industrial waste heat; inorganic salts are used as heat storage materials, in order to enhance stability and prevent agglomeration, Porous media materials can be added. The closed thermochemical adsorption heat storage test system designed this time can completely complete the three processes of heat charging, heat storage, and heat release, and can accurately measure the heat absorbed or released in each stage, and can measure different heat storage The heat storage performance of the material is systematically analyzed and tested.

In the specific implementation process, the outlet of the cryostat is connected to the fluid inlet 4 of the condensation pipe in the evaporation/condenser through a pipeline, and the fluid outlet 5 of the condensation pipe in the evaporation/condenser is connected to the inlet of the cryostat through a pipeline. connected, the outlet of the high temperature thermostat is connected to the fluid inlet of the condensation pipe in the evaporation/condenser through a pipeline, and the fluid outlet of the condensation pipe in the evaporation/condenser is connected to the inlet of the high temperature thermostat through a pipeline,

A valve E6 is installed on the pipeline connecting the outlet of the cryostat to the fluid inlet of the condensing pipe in the evaporator/condenser, and a valve F7 is installed on the pipeline connecting the fluid outlet of the condensing pipe in the evaporator/condenser to the inlet of the cryostat. A valve C8 is installed on the pipeline connected between the outlet of the high temperature thermostat and the fluid inlet of the condensation pipe in the evaporation/condenser, and a valve D9 is installed on the pipeline connected between the fluid outlet of the condensation pipe in the evaporation/condenser and the inlet of the high temperature thermostat;

Also comprise reactor 10, described reactor comprises insulated box body 11, visible window is set on described insulated box body, is provided with reactor fluid outlet 12 and reactor fluid inlet 13, described insulated box body A number of heat exchange structures are fixedly installed in the box, and several heat exchange structures are arranged in the insulated box in the order from front to back. The heat exchange structure is composed of a rectangular mesh box 14, a snake-shaped The coil 15 and the heat storage material 16 filled between the rectangular mesh box and the serpentine coil are jointly constituted; the heat exchange structure located in the front of the insulated box, and one end of the serpentine coil inside it is connected to the reaction connected to the fluid outlet of the reactor; the heat exchange structure located at the rear of the insulated box, one end of the serpentine coil inside it is connected to the fluid inlet of the reactor; the two adjacent heat exchange structures in the insulated box, the internal Serpentine coils are connected through coil joints;

The outlets of the high temperature thermostat and the low temperature thermostat are all connected to the reactor fluid inlet through pipelines, and the inlets of the high temperature thermostat and the low temperature thermostat are connected to the reactor fluid outlet through pipelines. Connect with the inner chamber of the evaporation/condenser through a steam pipeline 17, a vacuum pump 18 and a vacuum valve 19 are installed on the steam pipeline;

A valve A 20 is installed on the pipeline connecting the outlet of the high temperature thermostat with the reactor fluid inlet, a valve B21 is installed on the pipeline connected between the high temperature thermostat inlet and the reactor fluid outlet, and the outlet of the cryostat is connected to the reactor fluid outlet. A valve G22 is installed on the pipeline connected to the inlet, and a valve H23 is installed on the pipeline connected to the inlet of the cryostat and the fluid outlet of the reactor.

The electronic devices used in this technical solution include:

Computer: desktop computer is optional;

Data acquisition instrument: the existing data acquisition instrument with the function of collecting pressure signal and temperature signal can be selected;

Thermocouple, pressure sensor, liquid flow meter: existing products can be selected, and this application has no special requirements for the above components;

Vacuum pump and vacuum valve: it is sufficient to meet the requirements of steam pipe transportation and maintaining a vacuum environment. The vacuum pump and vacuum valve used in this application are purchased from existing products;

During the implementation of this technical solution, those skilled in the art need to connect all the electrical components in this case with their adapted power supply through wires, and should select an appropriate controller according to the actual situation to meet the control requirements, specific connection and control For the sequence, please refer to the following working principle. The electrical connections between the electrical parts are completed sequentially. The detailed connection means are known in the art. The following mainly introduces the working principle and process, and does not explain the electrical control.

In this technical solution, the reactor, as shown in Figures 2, 3, and 4, consists of a three-layer hexahedron rectangular mesh box, wrapped with a leak-proof net, and a serpentine coil is installed in the box to facilitate the entry and exit of hot fluid. It can be opened to facilitate the filling of heat storage material, and the thermal fluid exchanges heat with the heat storage material through the serpentine coil. The three-layer cabinet is an independent design, with a gap of 25mm between the layers, which is convenient for the gas to enter and discharge. The three-layer cabinets are connected through the joints of the coil. The serpentine coil in the reactor is made of copper tubes, and the heat exchange fluid is passed through the tubes, and the heat storage materials are filled outside the tubes and in the mesh box. When the heat is charged, the thermal fluid in the copper tube exchanges heat with the heat storage material. After the heat storage material absorbs heat, the moisture is desorbed from the heat storage material, and the dry heat storage material stores heat through sealing; when the heat is released, the water vapor When it enters the reactor, it is absorbed by the dry heat storage material, and a chemical reaction occurs to release heat. The fluid in the copper tube exchanges heat and mass with the heat storage material, and the heat is output.

The water vapor released when the heat storage material in the reactor absorbs heat is condensed in the visible evaporator/condenser with scale; when storing heat, the valve of the pipeline between the reactor and the evaporator/condenser is closed for non-destructive storage. Heat; when the heat is released, the evaporator/condenser provides water vapor for the reactor to carry out the compound reaction and release heat.

The high temperature thermostat is a heating device for supplying stored heat to the heat storage material in the heat storage device in the heat storage process; and for supplying heat to the formation of water vapor in the evaporator/condenser.

The cryostat is a cooling device, which is used to cool the evaporator/condenser during the heating stage, cool the water vapor evaporated from the reactor, and facilitate the measurement of dehydration; and cool the reactor during the heat storage stage to shorten the Cooling time: cool down the reactor during the heat release stage to speed up the reaction.

In the technical solution of this application, serpentine copper tubes are arranged inside the reactor, and the high-temperature thermal fluid provided by the high-temperature thermostat runs through the copper tubes, and the outer circumference of the tubes is filled with heat storage materials. As shown in Figure 2, the solidified adsorbent fills the two tubes The corresponding mass transfer distance is half the thickness of the adsorbent. The reactor uses leak-proof nets to load the heat storage material, which can prevent the solidified heat storage material from falling off due to vibration damage or collision, and can also fix the material; and can ensure the smooth circulation of water vapor and increase the heat storage material. contact area with water vapor.

A vacuum pump is installed on the steam outlet of the reactor to provide a vacuum degree for the reactor during the heat storage stage and heat release stage to speed up the evaporation of water; a vacuum valve is installed between the vacuum pump and the evaporation/condenser, and the valve can block the reactor The heat and mass exchange with the evaporator/condenser is conducive to lossless heat storage.

Install a thermocouple on the inlet and outlet fluid pipelines of the reactor, which can detect the fluid temperature change caused by heat absorption and heat release in the reactor during the heat charging stage and heat release stage; install a thermocouple inside the reactor, It is possible to observe the temperature change of the heat release process caused by the influence of water vapor on the thermochemical reaction in reactor 2, and the temperature change of the heat storage process; The temperature of the reacted water vapor, and the temperature of the water vapor entering the evaporator/condenser when the reactor releases heat; install thermocouples at the fluid inlet and outlet of the evaporator/condenser, and observe the consumption of cooling and heating materials in the evaporator/condenser Fluid heating/cooling due to temperature change. Install pressure sensors in the reactor and evaporator/condenser respectively, and observe the pressure changes of the reactor and evaporator/condenser during the four periods of heat charging, heat storage, heat release and cooling. Install a liquid flow meter on the outlet piping of the high temperature thermostat and cryostat to measure the flow of heating/cooling fluid.

The adsorbent is a composite adsorption heat storage material obtained by compounding porous materials and water-absorbing inorganic salts. The porous material is one or more composites of materials such as expanded graphite, activated carbon or silica gel; the water-absorbing inorganic salt is selected from the compound of strong water-absorbing inorganic salt and medium water-absorbing inorganic salt, and LaCl ₃ /LiCl, LaCl ₃ /CaCl ₂ , MgSO ₄ /LiCl and MgSO ₄ /CaCl ₂ are composited with porous materials.

The working principle of this application is described as follows:

The working process of the system includes three stages:

(1) Heating process: open the valves A, B, E, F and the vacuum valve, and close the other valves C, D, G, H; the thermal fluid in the high temperature thermostat passes through the valves A and B to heat the reactor, and the inorganic salt water The compound is heated and desorbed, and the water molecules produced by desorption leave the reactor. This process is accompanied by heat input, and the absorbed heat is stored in the dry adsorbent, which is tested by the temperature sensor and flow tester on the inlet and outlet fluid lines of the reactor. The heat charged; the water vapor desorbed by the adsorption heat storage material enters the visualized evaporator/condenser, and the cryostat passes through the valves E and F to cool the evaporator/condenser, condensing the water vapor into a liquid, and testing the height of the liquid level change ( The height of the measurement accuracy is 1mm); until the end of heating, close the valves A, B, E, F and the vacuum valve;

(2) Heat storage process: open valves G and H, and close other valves. Turn on the vacuum pump to evacuate the reactor for non-destructive storage of heat; the cryostat accelerates cooling of the reactor, and closes valves G and H after reaching normal temperature;

(3) Heat release process: open valves C and D, open valves G, H and vacuum valves, and close other valves; the high temperature thermostat heats the water in the evaporation/condenser through valves C and D, and evaporates quickly under low pressure Water vapor is released; the heat storage material undergoes an adsorption reaction with the water vapor released in the evaporator/condenser, and this process is accompanied by the release of heat. The cryostat cools the reactor through valves G and H, and passes through the reactor fluid inlet and outlet pipes The thermocouple on the road measures the temperature rise of the liquid at the inlet and outlet, and calculates the heat released in combination with the flow meter until the end of the heat release.

As a preferred solution, further, the heat storage material is an adsorption heat storage material composed of a porous material and a water-absorbing inorganic salt.

As a preferred solution, further, the porous material is one or more composites of expanded graphite, activated carbon or silica gel.

As a preferred solution, further, the water-absorbing inorganic salt is selected from a combination of a strong water-absorbing inorganic salt and a moderately water-absorbing inorganic salt, and the compound combination includes LaCl ₃ /LiCl, LaCl ₃ /CaCl ₂ , MgSO ₄ / LiCl or MgSO ₄ /CaCl ₂ .

As a preferred solution, further, there are three heat exchange structures in the thermal insulation box, and the distance between two adjacent heat exchange structures is 20-30 mm, preferably 25 mm.

As a preferred solution, further, in the heat exchange structure, the ports at both ends of the serpentine coil protrude from the rectangular mesh box, and the ports of the serpentine coil protruding from the rectangular mesh box are connected to the coil interface, react reactor fluid outlet or reactor fluid inlet connection.

As a preferred solution, further, a distance of 10-20 mm is maintained between the rectangular mesh box and the inner surface of the heat preservation box, and a distance of 20 mm is maintained between the rectangular mesh box and the upper and lower surfaces of the heat preservation box, and Keep a distance of 10mm between the side surfaces of the thermal insulation box.

As a preferred solution, further, a thermocouple is installed at the steam inlet of the evaporator/condenser, and a thermocouple is installed at the fluid outlet of the condensing tube and the fluid inlet of the condensing tube of the evaporator/condenser, and the evaporating/condensing A pressure sensor for the internal air pressure of the detector is also installed on the detector; a thermocouple is installed at the reactor fluid outlet and the reactor fluid inlet, and the thermocouple for detecting its internal temperature and detecting its internal pressure are also installed on the thermal insulation box. The pressure sensor, the thermocouple and the pressure sensor are connected to the data acquisition instrument and transmit signals to the data acquisition instrument 24.

As a preferred solution, further, liquid flow meters are installed at the outlets of the cryostat and the high temperature thermostat, and the liquid flow meters are connected to the data acquisition instrument and transmit signals to the data acquisition instrument.

As a preferred solution, further, the data acquisition instrument is connected to a computer 25 .

Example 2

The high temperature thermostat can be replaced with industrial waste heat, and the low temperature thermostat can be replaced with domestic water or municipal heating water that needs to be heated to store heat energy across seasons; The high temperature thermostat can be disabled for both phase and release phases.

Waste heat utilization is mainly for power generation, but low-temperature waste heat (below 350°C) power generation technology is relatively backward. Low-temperature waste heat accounts for more than 60% of the total waste heat in my country. The thermal chemical adsorption heat storage system uses low-temperature waste heat to operate in a short-term heat storage mode. The heating process is carried out during the low-grade waste heat supply period, and the heat release mode is operated during the period when the user or the municipality has heating/hot water demand. The system realizes efficient utilization of industrial waste heat. Others are the same as in Example 1.

Example 3

Replace the high temperature thermostat with a solar collector as a heat source, and replace the low temperature thermostat with domestic water that needs to be heated to store heat energy across seasons; The high temperature thermostat may not be activated during the heat release stage.

Using cross-season heat storage technology to store sufficient solar heat in spring, summer and autumn for heating/hot water in winter is an important way to maximize the use of solar energy to improve building energy efficiency and achieve emission reduction goals. It is becoming a solar heating / An important development direction of hot water technology. In the higher temperature range that solar collectors can easily reach in summer, the heat storage material can fully absorb heat and generate two easily separated products—water and inorganic salts—to realize the storage of solar radiation heat. Under the lower temperature conditions in winter, the two separated products of the heat storage reaction can fully carry out the chemical reaction, realize the cyclic regeneration of the heat storage material, and release heat in the process, which can be used for building heating/hot water. Others are the same as in Example 1.

Example 4

Replace the high temperature thermostat with a solar collector as a heat source, and replace the low temperature thermostat with domestic water that needs to be heated, heat storage during the day and release heat at night; Brief and negligible; the high temperature thermostat may not be activated during the heat release phase.

For example, Tibet and Xinjiang have abundant sunshine in spring, summer, and autumn, and the large temperature difference between day and night is the characteristic of their climate. The general temperature difference is about 12°C, and the daily temperature difference in the Gobi desert can reach 20-25°C. Sweating profusely during the day, covered with quilts at night, and experiencing changes in cold and heat within a day. The invention is a closed thermochemical heat storage system, water and inorganic salts are recycled materials, which can make good use of the climate type of the area, carry out desorption reaction to charge solar energy during the day, and carry out chemical reaction to release heat at night. Others are the same as in Example 1.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. without further restrictions. The phrase "the inclusion of an element defined by ... does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising said element".

The above-mentioned technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention, and some changes that those skilled in the art may make to certain parts reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims (7)

1. A high-efficiency closed thermochemical adsorption heat storage test system, comprising a high temperature thermostat (1), a low temperature thermostat (2) and an evaporation/condenser (3), the outlet of the low temperature thermostat passes through a pipeline and The condensing pipe fluid inlet (4) in the evaporator/condenser is connected, and the condensing pipe fluid outlet (5) in the evaporating/condenser is connected with the inlet of the low temperature thermostat through a pipeline, and the outlet of the high temperature thermostat is connected with the low temperature thermostat through a pipeline. The fluid inlet of the condensing pipe in the evaporator/condenser is connected, and the fluid outlet of the condensing pipe in the evaporator/condenser is connected to the inlet of the high-temperature thermostat through a pipeline, and it is characterized in that, A valve E (6) is installed on the pipeline connecting the outlet of the cryostat to the fluid inlet of the condensing pipe in the evaporator/condenser, and a valve F is installed on the pipeline connecting the fluid outlet of the condensing pipe in the evaporator/condenser to the inlet of the cryostat (7), the valve C (8) is installed on the pipeline connected between the outlet of the high temperature thermostat and the fluid inlet of the condensation pipe in the evaporation/condenser, and the pipe connected between the fluid outlet of the condensation pipe in the evaporation/condenser and the inlet of the high temperature thermostat Install valve D(9) on the road; Also comprising a reactor (10), the reactor includes an insulated box (11), a visible window is arranged on the insulated box, and a reactor fluid outlet (12) and a reactor fluid outlet (12) are provided on the insulated box. Entrance (13), a number of heat exchange structures are fixedly installed in the heat preservation box, and several heat exchange structures are arranged in the heat preservation box according to the order from front to back, and the heat exchange structure is composed of a rectangular mesh box (14) , the serpentine coil (15) installed in the mesh box and the heat storage material (16) filled between the rectangular mesh box and the snake coil; The heat exchange structure, one end of the inner serpentine coil is connected to the reactor fluid outlet; the last heat exchange structure in the heat preservation box, one end of the inner serpentine coil is connected to the reactor fluid inlet; Two adjacent heat exchange structures in the box, the serpentine coils inside are connected by coil joints; The outlets of the high temperature thermostat and the low temperature thermostat are all connected to the reactor fluid inlet through pipelines, and the inlets of the high temperature thermostat and the low temperature thermostat are connected to the reactor fluid outlet through pipelines. Connect with evaporation/condenser inner cavity through steam pipeline (17), vacuum pump (18) and vacuum valve (19) are installed on the steam pipeline; A valve A (20) is installed on the pipeline connecting the outlet of the high temperature thermostat with the reactor fluid inlet, and a valve B (21) is installed on the pipeline connected between the high temperature thermostat inlet and the reactor fluid outlet, and the low temperature thermostat A valve G (22) is installed on the pipeline connecting the outlet to the reactor fluid inlet, and a valve H (23) is installed on the pipeline connecting the cryostat inlet to the reactor fluid outlet. The heat storage material is an adsorption heat storage material composed of a porous material and a water-absorbing inorganic salt. The porous material is one or more composites of expanded graphite, activated carbon or silica gel. The water-absorbing inorganic salt is selected from a combination of strong water-absorbing inorganic salts and moderately water-absorbing inorganic salts, and the compound combination includes LaCl3/LiCl, LaCl3/CaCl2, MgSO4/LiCl or MgSO4/CaCl2. 2. The efficient closed thermochemical adsorption heat storage test system according to claim 1, characterized in that, the number of heat exchange structures in the heat preservation box is three, and the number of heat exchange structures between two adjacent heat exchange structures is three. The distance is 20-30mm. 3. The high-efficiency closed thermochemical adsorption heat storage test system according to claim 2, characterized in that, the ports at both ends of the serpentine coil in the heat exchange structure protrude from the rectangular mesh box body, and protrude from the rectangular mesh box. The serpentine coil port of the mesh box is connected with the coil interface, the reactor fluid outlet or the reactor fluid inlet. 4. The efficient closed thermochemical adsorption heat storage test system according to claim 3, characterized in that, a distance of 10-20 mm is maintained between the rectangular mesh box and the inner surface of the heat preservation box. 5. The efficient closed thermochemical adsorption heat storage test system according to claim 1, characterized in that a thermocouple is installed at the steam inlet of the evaporator/condenser, and a fluid outlet of the condensation pipe of the evaporator/condenser is Thermocouples are installed at the fluid inlets of the condensing pipes, and a pressure sensor of the internal air pressure of the detector is also installed on the evaporation/condenser; thermocouples are installed at the fluid outlets of the reactor and the fluid inlets of the reactors, and the thermal insulation box A thermocouple for detecting its internal temperature and a pressure sensor for detecting its internal pressure are also installed on it, and the thermocouple and pressure sensor are all connected with the data acquisition instrument (24) and transmit signals to the data acquisition instrument. 6. The efficient closed thermochemical adsorption heat storage test system according to claim 5, wherein a liquid flow meter is installed at the outlet of the cryostat and the high temperature thermostat, and the liquid flow meter and the data The logger connects and transmits signals to the data logger. 7. The high-efficiency closed thermochemical adsorption heat storage test system according to any one of claims 5 or 6, characterized in that the data acquisition instrument is connected to a computer (25).