A calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system and application method

Abstract

The present invention discloses a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system and an application method. The system includes a rotary ball mill reactor; a reaction chamber is provided inside the rotary ball mill reactor, and a plurality of grinding balls are provided in the reaction chamber; a partition plate assembly is provided in the reaction chamber; the partition plate assembly includes a fixed rod and a plurality of partition plates; the two ends of the fixed rod are fixed to the center of the two ends of the rotary ball mill reactor, and do not rotate with the rotary ball mill reactor; the partition plates are all fixed on the fixed rod, and are arranged at intervals to divide the reaction chamber into a plurality of spaces; a plurality of grinding balls are evenly distributed in each space; the edge of the partition plate does not connect with the inner wall of the reaction chamber, and the lower edge of the partition plate has a quarter-circle notch, and the height of the notch is less than the diameter of the grinding ball. The present invention has the characteristics of high energy storage density, fast reaction speed, high circulation rate, environmental friendliness, safety, stability, low price and easy availability, and can overcome the problem that solar high-temperature thermal power stations cannot operate continuously and stably.

Description

Technical Field

[0001] The invention belongs to the technical field of energy storage, and relates to a thermochemical energy storage system, and in particular to a calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system and an application method. Background Art

[0002] Thermochemical energy storage uses reversible chemical reactions to store and utilize heat. It has high energy storage density (about 10 times that of sensible heat storage and 5 times that of latent heat storage), high circulation rate, safety, stability, and can achieve long-term storage. It provides a promising solution to the problem of solar energy not being able to provide energy continuously and stably due to factors such as favorable weather and day and night.

[0003] The Ca(OH)2 / CaO thermochemical energy storage system, which has high energy storage density, stability, fast reaction speed, low cost and easy availability, is one of the most promising systems in high-temperature thermochemical energy storage systems. Studies have shown that due to the high reaction temperature of the calcium-based thermochemical energy storage system, the reactants will experience sintering and pore clogging during the cycle, which limits the progress of the thermochemical reaction, reduces the cyclic activity of the material, and seriously affects the cycle life. The research on calcium-based thermochemical energy storage reactors is still in its initial stage, and China is only at the beginning of studying its basic performance. Designing a reactor that can meet the needs of enhanced heat and mass transfer in calcium-based thermochemical energy storage systems is an important issue that needs to be solved urgently. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system and an application method, which can effectively solve the problems of low heat and mass transfer and circulation performance in calcium-based high-temperature thermochemical heat storage and release reactions.

[0005] To achieve the above-mentioned purpose, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which has the following characteristics: it comprises a thermochemical energy storage unit; the thermochemical energy storage unit comprises a rotary ball mill reactor; the rotary ball mill reactor is tilted and has a solid particle feed port, a solid particle discharge port, a gas input port and a gas output port; a reaction chamber is arranged inside the rotary ball mill reactor, and a plurality of grinding balls are arranged in the reaction chamber; a partition plate assembly is arranged in the reaction chamber; the partition plate assembly comprises a fixed rod and a plurality of partition plates; the fixed rod is arranged on the central axis of the rotary ball mill reactor, and its two ends are fixed at the center of the two ends of the rotary ball mill reactor, and does not rotate with the rotation of the rotary ball mill reactor; the partition plates are all fixed on the fixed rod, and a plurality of partition plates are arranged at intervals to divide the reaction chamber into a plurality of spaces; a plurality of grinding balls are evenly distributed in each space; the edge of the partition plate does not touch the inner part of the reaction chamber; The walls are connected, and the lower edge of the partition plate has a quarter-circle notch, the height of the notch is less than the diameter of the grinding ball; the heated air enters the rotary ball mill reactor through the gas input port, so that the rotary ball mill reactor reaches the reaction temperature; Ca(OH)2 solid particles enter the rotary ball mill reactor through the solid particle feed port, decompose at the reaction temperature to produce CaO and water vapor, and are discharged through the solid particle discharge port and the gas output port respectively; water vapor enters the rotary ball mill reactor through the gas input port, so that the rotary ball mill reactor reaches the reaction temperature; CaO solid particles enter the rotary ball mill reactor through the solid particle feed port, react with water vapor at the reaction temperature to generate Ca(OH)2 solid particles and release heat, and the Ca(OH)2 solid particles are discharged through the solid particle discharge port, and the released heat heats the water vapor that has not participated in the reaction and is then discharged through the gas output port.

[0006] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein the gas input port and the gas output port are respectively arranged at the two ends of the rotary ball mill reactor, the gas input port is located at the low end, and the gas output port is located at the high end; the solid particle feed port and the solid particle discharge port are respectively arranged at the two ends of the rotary ball mill reactor, the solid particle feed port is located at the high end, and the solid particle discharge port is located at the low end.

[0007] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein, the gas input port is provided with a gas distributor, and the gas distributor evenly distributes the inflowing gas over the entire cross-section of the reaction chamber; and a filter is provided between the reaction chamber, the gas distributor and the gas output port.

[0008] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein, the thermochemical energy storage unit also includes a Ca(OH)2 storage tank and a CaO storage tank; the system also includes an auxiliary unit; the auxiliary unit includes an energy storage preheating heat exchanger and an energy release preheating heat exchanger; the outlet of the Ca(OH)2 storage tank, a heat exchange channel of the energy storage preheating heat exchanger and a solid particle feed port of the rotary ball mill reactor are connected in sequence through pipelines, and the solid particle discharge port of the rotary ball mill reactor, another heat exchange channel of the energy storage preheating heat exchanger and the inlet of the CaO storage tank are connected in sequence through pipelines to form an energy storage path; the outlet of the CaO storage tank, a heat exchange channel of the energy release preheating heat exchanger and the solid particle feed port of the rotary ball mill reactor are connected in sequence through pipelines, and the solid particle discharge port of the rotary ball mill reactor, another heat exchange channel of the energy release preheating heat exchanger and the inlet of the Ca(OH)2 storage tank are connected in sequence through pipelines to form an energy release path.

[0009] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein the energy storage preheating heat exchanger and the energy release preheating heat exchanger are both powder heat exchangers.

[0010] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein the auxiliary unit also includes a fan, an air preheating heat exchanger, an air heater and a dehumidifier; the fan, a heat exchange channel of the air preheating heat exchanger, the air heater and the gas input port of the rotary ball mill reactor are connected in sequence through pipelines to form an energy storage air inlet path; the gas output port of the rotary ball mill reactor, another heat exchange channel of the air preheating heat exchanger, and the inlet of the dehumidifier are connected in sequence through pipelines, and the gas outlet of the dehumidifier is connected to the fan to form an energy storage air outlet path.

[0011] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein the auxiliary unit also includes a water tank, a water pump, a steam preheating heat exchanger, a steam heater, an exothermic heat exchanger, a condenser and a water treatment device; the water tank, the water pump, a heat exchange channel of the steam preheating heat exchanger, the steam heater and the gas input port of the rotary ball mill reactor are connected in sequence through pipelines to form an energy release gas inlet path; the gas output port of the rotary ball mill reactor, the exothermic heat exchanger, another heat exchange channel of the steam preheating heat exchanger, the condenser, the water treatment device and the water tank are connected in sequence through pipelines to form an energy release gas outlet path.

[0012] Furthermore, the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein the liquid outlet of the dehumidifier, the water treatment device, and the water tank are connected in sequence through pipelines.

[0013] The present invention also provides an application method of the above calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system, which has the following characteristics: comprising an energy storage stage and an energy release stage;

[0014] The energy storage stage is as follows: air is blown into the air preheating heat exchanger through the fan for preheating, and then enters the air heater to obtain high-temperature air after being heated by the air heater. Then, the high-temperature air enters the rotary ball mill reactor through the gas input port to make the rotary ball mill reactor reach the reaction temperature; Ca(OH)2 solid particles flow out of the Ca(OH)2 storage tank, pass through the energy storage preheating heat exchanger, and flow into the rotary ball mill reactor through the solid particle feed port, where a decomposition reaction occurs at the high temperature reaction temperature to produce CaO and water vapor; the product CaO flows downward under the action of gravity and the vibration generated by the falling of the grinding balls to prevent the solid particles from accumulating on the top of the reaction chamber to reduce the heat exchange efficiency and reaction rate, and then the solid particles are discharged from the solid particles. The air with waste heat is fully mixed with the water vapor generated in the reaction process in the rotary ball mill reactor, and then flows out from the gas outlet after filtering out the solid particles through the filter screen set in front of the gas outlet of the rotary ball mill reactor, and enters the air preheating heat exchanger for heat exchange, and then enters the dehumidifier. Under the action of the dehumidifier, the water vapor is discharged, and the air with waste heat discharged from the dehumidifier enters the fan and then participates in the next energy storage process; the water discharged from the dehumidifier enters the water treatment device for purification, and then enters the water tank to participate in the energy release process; as the energy storage reaction progresses, the reaction waste heat of the decomposition product CaO is used to preheat the Ca(OH)2 solid particles that will later participate in the energy storage reaction in the energy storage preheating heat exchanger, and finally flows into the CaO storage tank for storage;

[0015] The energy release stage is as follows: water in the water tank is pumped into the steam preheating heat exchanger for preheating through a water pump, and then enters the steam heater to be heated to the reaction temperature, and then the steam reaching the reaction temperature enters the rotary ball mill reactor through the gas input port, so that the reaction temperature is reached in the rotary ball mill reactor; CaO solid particles flow out of the CaO storage tank, pass through the energy release preheating heat exchanger, and flow into the rotary ball mill reactor through the solid particle feed port, react with water vapor at the high temperature reaction temperature to generate Ca(OH)2 solid particles, and release a large amount of high-grade heat at the same time; the product Ca(OH)2 solid particles flow downward under the action of gravity and the vibration generated by the falling grinding balls, and are discharged from the solid particle discharge port. outflow; the water vapor that does not participate in the reaction in the rotary ball mill reactor is heated to form high-temperature superheated water vapor, and the superheated water vapor carrying high-grade heat flows out from the gas output port of the rotary ball mill reactor and enters the exothermic heat exchanger to release heat. The released heat is used to generate electricity. Then the water vapor enters the water vapor preheating heat exchanger for heat exchange to preheat the water that will participate in the energy release process next time, and then it is condensed and purified through the condenser and water treatment device. Finally, the purified water is stored in the water tank again; as the energy release reaction progresses, the reaction waste heat of the synthetic product Ca(OH)2 is used to preheat the CaO solid particles that will later participate in the energy release reaction in the energy release preheating heat exchanger, and finally flows into the Ca(OH)2 storage tank for storage.

[0016] Furthermore, the present invention provides an application method of a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system, which may also have the following characteristics: wherein the Ca(OH)2 solid particles and CaO solid particles are both fed by a spiral conveying method.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system and application method, including a thermochemical energy storage unit and an auxiliary unit. The thermochemical energy storage system adopted is Ca(OH)2 / CaO, which stores energy through the mutual conversion between thermal energy and chemical energy, and uses the absorbed solar heat to heat the air. The Ca(OH)2 solid particles are in direct contact with the high-temperature hot air for heat exchange to produce an endothermic decomposition reaction, and the absorbed heat is stored in the form of chemical energy in the decomposition products CaO and H2O; when heat is needed, CaO and H2O undergo a reverse thermochemical reaction, and the chemical energy stored in CaO and H2O is reversed into thermal energy and released, and the released high-grade heat is used for power generation. The present invention has the characteristics of high energy storage density, fast reaction speed, high circulation rate, environmental friendliness, safety, stability, low price and easy availability, and can overcome the problem that solar high-temperature thermal power stations cannot operate continuously and stably. Specific

[0018] 1. In the rotary ball mill reactor provided by the present invention, the lower edge of the partition plate has a quarter-circle notch, and the height of the notch is less than the diameter of the grinding ball. Since most of the reactant solid particles are mainly located at the bottom of the reaction chamber under the action of gravity, the partition plate of this structure can ensure that the solid particles can flow smoothly and prevent the solid particles from accumulating in a certain compartment, causing local overheating and affecting the heat exchange effect; further, the partition plate is fixed on the fixed rod, and the partition plate is not in contact with the wall surface. At the same time, the two ends of the fixed rod are respectively fixed to the two ends of the rotary ball mill reactor, and the two ends of the rotary ball mill reactor do not rotate with the rotation of the middle part, so the partition plate does not rotate with the rotation of the middle reactor. In this way, while ensuring the above-mentioned effect (smooth flow of solid particles), it is also possible to ensure that the gas flows evenly between the spaces so that the gas can fully contact and react with the solid particles. In addition, the rotary ball mill reactor of the present application is designed without a heat exchange chamber. During the energy storage reaction process, the high-temperature air obtained after heating by the auxiliary unit is directly introduced into the reaction chamber and directly contacts and exchanges heat with the solid particles in the reaction chamber, so that during the energy storage reaction process, the high-temperature air is in direct contact with the solid particle reactants, and the heat exchange is more efficient.

[0019] 2. The calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system provided by the present invention can realize the reversible reaction CaO+H2O→Ca(OH)2, and the received energy is stored in the form of chemical energy in its decomposition products CaO and H2O. It has the characteristics of high energy storage density, high cycle efficiency, fast reaction speed, environmental friendliness, stability, safety, and low raw material price. It can solve the problem of continuous and efficient operation of solar high-temperature thermal power stations, can be widely used in the field of solar high-temperature photothermal power generation, and is also suitable for high-temperature thermal energy storage and regeneration of other types of power stations.

[0020] 3. The calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system proposed by the present invention can regulate the energy storage / release process, i.e., the decomposition / synthesis reaction of Ca(OH)2 solid particles, by adjusting the reaction temperature and pressure; matching the released thermal energy level, and more efficiently utilizing the thermal energy released by the reaction. Through the energy conversion and utilization concept of thermal energy-chemical energy-thermal energy, the problem of low energy utilization rate caused by heat mismatch and unevenness caused by time or place is solved.

[0021] Fourth, the calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system provided by the present invention uses water vapor as both the reaction medium and the heat exchange medium for the synthesis reaction to regenerate high-temperature heat energy, and uses air as the heat exchange medium for the decomposition reaction to store high-temperature heat energy. The decomposition reaction and the synthesis reaction are stably operated in the same device, saving the installation and maintenance costs of the equipment, while reducing the energy consumption of the equipment operation and improving the stability of the entire set of equipment.

[0022] 5. The rotary ball mill reactor provided by the present invention can effectively improve the problems of agglomeration, sintering and deactivation of energy storage materials after high-temperature reaction. On the one hand, the steel balls are moved in the reaction chamber to crush and grind the reaction materials, thereby fully breaking up the agglomerated and sintered reactants, allowing the solid particles to fully react, thereby improving the conversion rate and the cycle performance of the reactor; on the other hand, the vibration generated by the falling steel balls promotes the full flow of solid particles, allowing the solid particles to fully contact and react with the gas, thereby promoting the mixing and reaction of gas-solid reactants, and improving the reaction efficiency and the cycle life of the reactants. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system;

[0024] Figure 2 is a schematic diagram of the structure of a rotary ball mill reactor;

[0025] Figure 3 It is a schematic diagram of the rotary ball mill reactor partition plate and its relationship with the inner wall of the reaction chamber. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, this embodiment provides a calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system, including a thermochemical energy storage unit and an auxiliary unit.

[0028] The thermochemical energy storage unit comprises a rotary ball mill reactor 11 .

[0029] like Figure 2As shown, the rotary ball mill reactor 11 is tilted, so that the reactant solid particles can flow obliquely downward under their own weight, providing partial power for the flow of the reactant solid particles in the reaction chamber 115. The rotary ball mill reactor 11 has a solid particle feed port 111, a solid particle discharge port 112, a gas input port 113 and a gas output port 114. Among them, the gas input port 113 and the gas output port 114 are respectively arranged at the two ends of the rotary ball mill reactor 11, the gas input port 113 is located at the low end, and the gas output port 114 is located at the high end; the solid particle feed port 111 and the solid particle discharge port 112 are respectively arranged at the two ends of the rotary ball mill reactor 11, the solid particle feed port 111 is located at the high end, and the solid particle discharge port 112 is located at the low end. The direction of gas flow inside the reaction chamber 115 is opposite to the direction of flow of the reactant solid particles, which is conducive to sufficient reaction and heat exchange between the reactant solid particles and the gas.

[0030] A reaction chamber 115 is provided inside the rotary ball mill reactor 11, and a plurality of grinding balls 116 are arranged inside the reaction chamber 115. The grinding balls 116 will move under the driving force of the rotating rotary ball mill reactor 11, and the moving grinding balls 116 will crush and grind the reactant solid particles, thereby breaking up the agglomerated and sintered reactants, which is beneficial for the reactant solid particles to fully contact and react with the gas.

[0031] like Figure 2 and 3 The reaction chamber 115 is provided with a partition plate assembly. The partition plate assembly includes a fixed rod 1171 and a plurality of partition plates 1172. The fixed rod 1171 is arranged on the central axis of the rotary ball mill reactor 11, and its two ends are fixed to the centers of the two ends of the rotary ball mill reactor 11, and does not rotate with the rotation of the middle part of the rotary ball mill reactor 11. The partition plates 1172 are all fixed on the fixed rod 1171, and the plurality of partition plates 1172 are arranged at intervals to divide the reaction chamber 115 into a plurality of spaces.

[0032] A plurality of grinding balls 116 are evenly distributed in each space.

[0033] The edge of the partition plate 1172 is not in contact with the inner wall of the reaction chamber 115, and the lower edge of the partition plate 1172 has a quarter-circular notch, the height of the notch is less than the diameter of the grinding ball 116, so as to ensure that the grinding ball 116 remains in the corresponding space. At the same time, the gas in the reaction chamber 115 can flow from one space to another through the notch at the bottom of the partition plate 1172 and the gap between the partition plate 1172 and the inner wall of the reaction chamber 115.

[0034] The heated air enters the rotary ball mill reactor 11 through the gas input port 113, so that the rotary ball mill reactor 11 reaches the reaction temperature; the Ca(OH)2 solid particles enter the rotary ball mill reactor 11 through the solid particle feed port 111, and decompose at the reaction temperature to produce CaO and water vapor, which are discharged through the solid particle discharge port 112 and the gas output port 114, respectively. Water vapor enters the rotary ball mill reactor 11 through the gas input port 113, so that the rotary ball mill reactor 11 reaches the reaction temperature; the CaO solid particles enter the rotary ball mill reactor 11 through the solid particle feed port 111, and react with water vapor at the reaction temperature to produce Ca(OH)2 solid particles and release heat, and the Ca(OH)2 solid particles are discharged through the solid particle discharge port 112, and the heat released heats the water vapor that does not participate in the reaction and is then discharged through the gas output port 114.

[0035] In a preferred embodiment, the gas inlet 113 is provided with a gas distributor 118 , and the gas distributor 118 evenly distributes the inflowing gas over the entire cross section of the reaction chamber 115 , so as to facilitate full contact between the gas and the reactant solid particles in the reaction chamber 115 .

[0036] In a preferred embodiment, a filter screen 119 is disposed between the reaction chamber 115 and the gas distributor 118 and the gas outlet 114 to prevent the solid particles of the reactants from being blown out of the rotary ball mill reactor 11 .

[0037] In a preferred embodiment, the grinding balls 116 are steel balls. The rotary ball mill reactor 11 is made of Inconel 617 material, which meets the requirements of high temperature energy storage for system safety, reliability, maintainability and processability.

[0038] The thermochemical energy storage unit further includes a Ca(OH)2 storage tank 12 and a CaO storage tank 13 .

[0039] The auxiliary unit includes an energy storage preheating heat exchanger 201, an energy release preheating heat exchanger 202, a fan 203, an air preheating heat exchanger 204, an air heater 205, a dehumidifier 206, a water tank 207, a water pump 208, a water vapor preheating heat exchanger 209, a water vapor heater 210, a heat release heat exchanger 211, a condenser 212 and a water processor 213.

[0040] The outlet of the Ca(OH)2 storage tank 12, a heat exchange channel of the energy storage preheating heat exchanger 201, and the solid particle feed port 111 of the rotary ball mill reactor 11 are connected in sequence through pipelines, and the solid particle discharge port 112 of the rotary ball mill reactor 11, another heat exchange channel of the energy storage preheating heat exchanger 201, and the inlet of the CaO storage tank 13 are connected in sequence through pipelines to form an energy storage path. The outlet of the CaO storage tank 13, a heat exchange channel of the energy release preheating heat exchanger 202, and the solid particle feed port 111 of the rotary ball mill reactor 11 are connected in sequence through pipelines, and the solid particle discharge port 112 of the rotary ball mill reactor 11, another heat exchange channel of the energy release preheating heat exchanger 202, and the inlet of the Ca(OH)2 storage tank 12 are connected in sequence through pipelines to form an energy release path.

[0041] Among them, the energy storage preheating heat exchanger 201 and the energy release preheating heat exchanger 202 are both powder heat exchangers.

[0042] The fan 203, a heat exchange channel of the air preheating heat exchanger 204, the air heater 205 and the gas input port 113 of the rotary ball mill reactor 11 are connected in sequence through pipelines to form an energy storage air inlet path. The gas output port 114 of the rotary ball mill reactor 11, another heat exchange channel of the air preheating heat exchanger 204, and the inlet of the dehumidifier 206 are connected in sequence through pipelines, and the gas outlet of the dehumidifier 206 is connected to the fan 203 to form an energy storage air outlet path.

[0043] The water tank 207, the water pump 208, a heat exchange channel of the water vapor preheating heat exchanger 209, the water vapor heater 210 and the gas input port 113 of the rotary ball mill reactor 11 are connected in sequence through pipelines to form an energy release gas inlet path. The gas output port 114 of the rotary ball mill reactor 11, the heat release heat exchanger 211, another heat exchange channel of the water vapor preheating heat exchanger 209, the condenser 212, the water treatment device 213 and the water tank 207 are connected in sequence through pipelines to form an energy release gas outlet path.

[0044] The liquid outlet of the dehumidifier 206, the water treatment device 213, and the water tank 207 are connected in sequence through pipelines.

[0045] The application method of this system includes energy storage stage and energy release stage, such as Figure 1 shown.

[0046] The energy storage stage is:

[0047] The air is blown into the air preheating heat exchanger 204 through the fan 203 for preheating, and then enters the air heater 205. After being heated by the air heater 205, high-temperature air is obtained. Then, the high-temperature air enters the rotary ball mill reactor 11 through the gas input port 113, so that the reaction temperature is reached in the rotary ball mill reactor 11.

[0048] Ca(OH)2 solid particles flow out of the Ca(OH)2 storage tank 12, pass through the energy storage preheating heat exchanger 201, and flow into the rotary ball mill reactor 11 through the solid particle feed port 111, where they undergo a decomposition reaction at the high temperature reaction temperature to produce CaO and water vapor; the product CaO flows downward under the action of gravity and the vibration caused by the falling grinding balls 116, preventing the solid particles from accumulating on the top of the reaction chamber 115 to reduce the heat exchange efficiency and reaction rate, and then the solid particles flow out from the solid particle discharge port 112; the air with waste heat reacts with the water vapor produced in the reaction process The gas is fully mixed in the rotary ball mill reactor 11, and after the solid particles are filtered out by the filter 119 arranged in front of the gas outlet 114 of the rotary ball mill reactor 11, it flows out from the gas outlet 114, enters the air preheating heat exchanger 204 for heat exchange, and then enters the dehumidifier 206. Under the action of the dehumidifier 206, the water vapor is discharged, and the air with residual heat discharged from the dehumidifier 206 enters the fan 203 and then participates in the next energy storage process; the water discharged from the dehumidifier 206 enters the water processor 213 for purification, and then enters the water tank 207 to participate in the energy release process.

[0049] As the energy storage reaction progresses, the residual heat of the decomposition product CaO is used to preheat the Ca(OH)2 solid particles that later participate in the energy storage reaction in the energy storage preheating heat exchanger 201, and finally flows into the CaO storage tank 13 for storage.

[0050] The energy release phase is:

[0051] The water in the water tank 207 is pumped into the steam preheating heat exchanger 209 by the water pump 208 for preheating. After preheating, the water enters the steam heater to be heated to the reaction temperature. Then, the water vapor reaching the reaction temperature enters the rotary ball mill reactor 11 through the gas input port 113, so that the reaction temperature is reached in the rotary ball mill reactor 11.

[0052] CaO solid particles flow out from the CaO storage tank 13, pass through the energy release preheating heat exchanger 202, and flow into the rotary ball mill reactor 11 through the solid particle feed port 111, react with water vapor at the high temperature reaction temperature to generate Ca(OH)2 solid particles, while releasing a large amount of high-grade heat; the product Ca(OH)2 solid particles flow downward under the action of gravity and the vibration generated by the falling grinding balls 116, and flow out from the solid particle discharge port 112; the water vapor that does not participate in the reaction in the rotary ball mill reactor 11 is heated to form high-temperature superheated water vapor, and the superheated water vapor carrying high-grade heat flows out from the gas output port 114 of the rotary ball mill reactor 11, enters the heat release heat exchanger 211 to release heat, and the released heat is used for power generation, and then the water vapor enters the water vapor preheating heat exchanger 209 for heat exchange, which is used to preheat the water that participates in the energy release process next time, and then is condensed and purified through the condenser 212 and the water processor 213, and finally the purified water is stored in the water tank 207 again.

[0053] As the energy release reaction progresses, the residual heat of the reaction of the synthetic product Ca(OH)2 is preheated in the energy release preheating heat exchanger 202 to preheat the CaO solid particles that later participate in the energy release reaction, and finally flows into the Ca(OH)2 storage tank 12 for storage.

[0054] Among them, Ca(OH)2 solid particles and CaO solid particles are both fed by screw conveying method.

[0055] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. An application method of a calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system, characterized in that: The calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system includes a thermochemical energy storage unit; The thermochemical energy storage unit includes a rotary ball mill reactor; The rotary ball mill reactor is tilted and has a solid particle feed port, a solid particle discharge port, a gas input port and a gas output port; A reaction chamber is provided inside the rotary ball mill reactor, and a plurality of grinding balls are arranged in the reaction chamber; A partition plate assembly is provided in the reaction chamber; the partition plate assembly includes a fixed rod and a plurality of partition plates; the fixed rod is arranged on the central axis of the rotary ball mill reactor, and both ends of the fixed rod are fixed to the centers of the two ends of the rotary ball mill reactor, and does not rotate with the rotation of the rotary ball mill reactor; the partition plates are all fixed on the fixed rod, and the plurality of partition plates are arranged at intervals to divide the reaction chamber into a plurality of spaces; Several grinding balls are evenly distributed in each space; The edge of the partition plate does not touch the inner wall of the reaction chamber, and the lower edge of the partition plate has a quarter-circle notch, the height of the notch is less than the diameter of the grinding ball; The heated air enters the rotary ball mill reactor through the gas inlet, so that the rotary ball mill reactor reaches the reaction temperature; the Ca(OH)2 solid particles enter the rotary ball mill reactor through the solid particle feed inlet, decompose at the reaction temperature to produce CaO and water vapor, which are discharged through the solid particle discharge port and the gas output port respectively; Water vapor enters the rotary ball mill reactor through the gas input port, so that the rotary ball mill reactor reaches the reaction temperature; CaO solid particles enter the rotary ball mill reactor through the solid particle feed port, react with water vapor at the reaction temperature to generate Ca(OH)2 solid particles and release heat, and the Ca(OH)2 solid particles are discharged through the solid particle discharge port, and the released heat heats the water vapor that has not participated in the reaction and is then discharged through the gas output port; The thermochemical energy storage unit also includes a Ca(OH)2 storage tank and a CaO storage tank; the system also includes an auxiliary unit; The auxiliary unit includes an energy storage preheating heat exchanger and an energy release preheating heat exchanger; the outlet of the Ca(OH)2 storage tank, a heat exchange channel of the energy storage preheating heat exchanger and a solid particle feed port of the rotary ball mill reactor are connected in sequence through pipelines, and the solid particle discharge port of the rotary ball mill reactor, another heat exchange channel of the energy storage preheating heat exchanger and an inlet of the CaO storage tank are connected in sequence through pipelines to form an energy storage path; the outlet of the CaO storage tank, a heat exchange channel of the energy release preheating heat exchanger and a solid particle feed port of the rotary ball mill reactor are connected in sequence through pipelines, and the solid particle discharge port of the rotary ball mill reactor, another heat exchange channel of the energy release preheating heat exchanger and an inlet of the Ca(OH)2 storage tank are connected in sequence through pipelines to form an energy release path; The auxiliary unit further includes a fan, an air preheating heat exchanger, an air heater and a dehumidifier; the fan, a heat exchange channel of the air preheating heat exchanger, the air heater and the gas input port of the rotary ball mill reactor are connected in sequence through pipelines to form an energy storage air inlet path; the gas output port of the rotary ball mill reactor, another heat exchange channel of the air preheating heat exchanger and the inlet of the dehumidifier are connected in sequence through pipelines, and the gas outlet of the dehumidifier is connected to the fan to form an energy storage air outlet path; The auxiliary unit further comprises a water tank, a water pump, a water vapor preheating heat exchanger, a water vapor heater, an exothermic heat exchanger, a condenser and a water treatment device; the water tank, the water pump, a heat exchange channel of the water vapor preheating heat exchanger, the water vapor heater and the gas input port of the rotary ball mill reactor are sequentially connected through pipelines to form an energy release gas inlet path; the gas output port of the rotary ball mill reactor, the exothermic heat exchanger, another heat exchange channel of the water vapor preheating heat exchanger, the condenser, the water treatment device and the water tank are sequentially connected through pipelines to form an energy release gas outlet path; The liquid outlet of the dehumidifier, the water treatment device, and the water tank are connected in sequence through pipelines; The application method of the calcium hydroxide thermochemical energy storage direct rotary ball mill reaction system includes an energy storage stage and an energy release stage; The energy storage stage is: The air is blown into the air preheating heat exchanger through the fan for preheating, and then enters the air heater to obtain high-temperature air after being heated by the air heater. Then, the high-temperature air enters the rotary ball mill reactor through the gas input port, so that the rotary ball mill reactor reaches the reaction temperature; Ca(OH)2 solid particles flow out of the Ca(OH)2 storage tank, pass through the energy storage preheating heat exchanger, and flow into the rotary ball mill reactor through the solid particle feed port, where a decomposition reaction occurs at the high temperature reaction temperature to produce CaO and water vapor; the product CaO flows downward under the action of gravity and the vibration caused by the falling of the grinding balls, preventing the solid particles from accumulating on the top of the reaction chamber to reduce the heat exchange efficiency and reaction rate, and then the solid particles flow out from the solid particle discharge port; the air with waste heat and the water vapor generated in the reaction process are fully mixed in the rotary ball mill reactor, and the solid particles are filtered out by the filter net set in front of the gas output port of the rotary ball mill reactor, and then flow out from the gas output port, enter the air preheating heat exchanger for heat exchange, and then enter the dehumidifier. Under the action of the dehumidifier, the water vapor is discharged, and the air with waste heat discharged from the dehumidifier enters the fan and then participates in the next energy storage process; the water discharged from the dehumidifier enters the water treatment device for purification, and then enters the water tank to participate in the energy release process; As the energy storage reaction progresses, the residual heat of the decomposition product CaO is used to preheat the Ca(OH)2 solid particles that will later participate in the energy storage reaction in the energy storage preheating heat exchanger, and finally flow into the CaO storage tank for storage; The energy release stage is: The water in the water tank is pumped into the steam preheating heat exchanger for preheating through a water pump, and then enters the steam heater to be heated to the reaction temperature. Then, the steam reaching the reaction temperature enters the rotary ball mill reactor through the gas input port, so that the reaction temperature is reached in the rotary ball mill reactor. CaO solid particles flow out of the CaO storage tank, pass through the energy release preheating heat exchanger, and flow into the rotary ball mill reactor through the solid particle feed port, where they react with water vapor at the high temperature reaction temperature to generate Ca(OH)2 solid particles, while releasing a large amount of high-grade heat; the product Ca(OH)2 solid particles flow downward under the action of gravity and the vibration generated by the falling grinding balls, and flow out from the solid particle discharge port; the water vapor that does not participate in the reaction in the rotary ball mill reactor is heated to form high-temperature superheated water vapor, and the superheated water vapor carrying high-grade heat flows out from the gas output port of the rotary ball mill reactor and enters the heat release heat exchanger to release heat. The released heat is used for power generation, and then the water vapor enters the water vapor preheating heat exchanger for heat exchange to preheat the water that will participate in the next energy release process, and then is condensed and purified through the condenser and water treatment device, and finally the purified water is stored in the water tank again; As the energy release reaction progresses, the waste heat from the reaction of the synthetic product Ca(OH)2 is used to preheat the CaO solid particles that will later participate in the energy release reaction in the energy release preheating heat exchanger, and finally flows into the Ca(OH)2 storage tank for storage.

2. The application method of the calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system according to claim 1, characterized in that: in, The gas input port and the gas output port are respectively arranged at two ends of the rotary ball mill reactor, the gas input port is located at the lower end, and the gas output port is located at the higher end; The solid particle feed port and the solid particle discharge port are respectively arranged at two ends of the rotary ball mill reactor, the solid particle feed port is located at the high end, and the solid particle discharge port is located at the low end.

3. The application method of the calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system according to claim 2 is characterized in that: in, The gas inlet is provided with a gas distributor, which evenly distributes the inflowing gas over the entire cross section of the reaction chamber; A filter screen is arranged between the reaction chamber, the gas distributor and the gas output port.

4. The application method of the calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system according to claim 1 is characterized in that: in, The energy storage preheating heat exchanger and the energy release preheating heat exchanger are both powder heat exchangers.

5. The application method of the calcium hydroxide thermochemical energy storage direct rotary ball milling reaction system according to claim 1 is characterized in that: in, The Ca(OH)2 solid particles and CaO solid particles are both fed by a screw conveying method.

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