Cross-season heat storage and release system based on cyclic conversion of calcium hydroxide and calcium oxide

Abstract

The utility model discloses a cross-season heat storage and release system based on cyclic conversion of calcium hydroxide and calcium oxide. Cross-season conversion and efficient utilization of electric energy are achieved. Comprising an electromagnetic rotary kiln, a quicklime digester, calcium oxide powder and calcium hydroxide powder, the electromagnetic kiln is composed of a rotary cylinder (24) and an electromagnetic heating cover (25); the quicklime digester is formed by sequentially connecting a first-stage spiral conveying stirrer (1), a second-stage spiral conveying stirrer (2) and a third-stage spiral conveying stirrer (3) end to end; based on the structure of a quick lime digester used in the traditional building material industry, the chemical heat pump principle that calcium oxide is converted into calcium hydroxide when meeting water and releases heat is taken as the reference, the purpose of generating high-temperature steam is achieved, and meanwhile, high-purity calcium hydroxide is generated; and full excitation of chemical reaction heat energy and full extraction and utilization of heat release energy are realized.

Description

Technical Field

[0001] This invention relates to an electromagnetic kiln for calcining calcium hydroxide to produce calcium oxide and a quicklime digester for producing calcium hydroxide from calcium oxide, and particularly to a transseasonal heat storage and release system based on the cyclic conversion of quicklime and hydrated lime. Background Technology

[0002] Green electric energy will replace existing thermal power generation as the mainstay of the power energy source; the instability of wind and solar power and the peak-valley effect of the power grid both require power conversion and energy storage technologies to address; existing power storage technologies are severely limited by high costs and high risks associated with large-scale power storage; currently, thermal power units use electric boilers with water tanks or molten salt thermal storage for deep peak shaving. Electric boilers with water tanks result in high energy consumption but low utilization, leading to unreasonable energy use and poor economic efficiency; molten salt thermal storage can generate steam, making energy use more reasonable than electric boilers with water tanks, but it suffers from higher investment and lower economic efficiency; both of these methods of converting electricity into heat can only meet the daily storage and consumption needs, and cannot achieve long-term energy storage; in recent years... Emerging thermal storage technologies include inter-seasonal thermal storage. Inter-seasonal thermal storage utilizes reversible thermochemical reactions to store and release heat, allowing for long-term heat storage without loss. It can store summer solar energy for winter use, improve the quality of thermal energy, and can be used for grid peak shaving and coupled with thermal power units. For example, calcium hydroxide dehydrates to form calcium oxide, which can be used for thermal storage, and its reverse reaction can release heat. Because lime is inexpensive and has a high thermal storage density (4-6 times that of water and 3-5 times that of molten salt), the storage and release process generates no waste, and energy can be stored at normal temperature and pressure with controllable safety, making it suitable for large-scale energy storage. However, how to economically, scientifically, and rationally convert calcium hydroxide into calcium oxide to achieve inter-seasonal thermal storage is a challenge faced on-site.

[0003] Currently, research on thermochemical energy storage systems is still in the laboratory stage. The conversion of calcium hydroxide and calcium oxide falls under the category of thermochemical energy storage systems. The building materials industry commonly uses the process of mixing calcium oxide (quicklime) with water to produce calcium hydroxide (hydrated lime). This process is generally completed using quicklime digesters. The focus of the entire process is on the production of hydrated lime. The high-temperature steam generated during the process is only studied from an environmental perspective, with the aim of preventing environmental pollution, without paying attention to the generation and scientific utilization of the heat energy of the high-temperature steam. How to effectively utilize the heat of the high-temperature steam generated as an additional product in the process of converting quicklime into hydrated lime has become a new research topic.

[0004] Thermochemical energy storage utilizes reversible thermochemical reactions to store energy through the interconversion of thermal and chemical energy. Solid calcium hydroxide undergoes a dehydration reaction upon heating, storing the received heat as chemical energy in the decomposition products calcium oxide and water. When thermal energy is needed, water is introduced into a reactor containing calcium oxide, resulting in a reverse hydration reaction to generate calcium hydroxide. Simultaneously, the stored chemical energy is reversed and released as thermal energy. As long as the energy storage medium (calcium hydroxide and calcium oxide) forms a closed loop and is properly stored, the energy storage time without heat loss can be very long. Currently, more than 70 thermochemical energy storage systems have been studied. Among them, the interconversion system of calcium hydroxide and calcium oxide has become one of the preferred thermochemical energy storage systems due to its high energy density, fast thermal energy storage and release rate, stability, safety, non-toxicity, low cost, and ease of handling. How to convert electrical energy into thermal energy across seasons and achieve the recyclable utilization of heat storage and release is a novel research topic. Summary of the Invention

[0005] This invention provides a cross-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, realizing the cross-seasonal conversion and efficient utilization of electrical energy.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A transseasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide includes an electromagnetic rotary kiln, a quicklime digester, calcium oxide powder, and calcium hydroxide powder. The electromagnetic kiln consists of a rotating cylinder and an electromagnetic heating hood. The quicklime digester is composed of a first-stage spiral conveyor agitator, a second-stage spiral conveyor agitator, and a third-stage spiral conveyor agitator connected end-to-end. A calcium hydroxide powder feed hopper is provided at the feed end of the electromagnetic rotary kiln, and a calcium oxide powder receiving hopper is provided at the discharge end of the electromagnetic rotary kiln. Similarly, a calcium oxide powder feed hopper is provided at the feed end of the quicklime digester, and a calcium hydroxide powder receiving hopper is provided at the discharge end of the quicklime digester. A chain conveyor is installed between the calcium hydroxide powder receiving hoppers, and a calcium oxide powder conveying and lifting system is installed between the calcium oxide powder receiving hopper and the calcium oxide powder feeding hopper. A steam outlet is installed at the discharge end of the electromagnetic rotary kiln, and a steam outlet pipe is connected to the steam outlet. The other end of the steam outlet pipe is connected to the hot water in the hot water storage tank, and a steam induced draft fan is installed on the steam outlet pipe. A spray water system is installed in the quicklime slaker, and a high-temperature steam exhaust port is installed on the quicklime slaker. An induced draft fan is connected to the high-temperature steam exhaust port, and a high-temperature steam conveying pipeline is connected to the output end of the induced draft fan. The high-temperature steam conveying pipeline is output to the heat system after passing through the hot blast stove.

[0008] A calcium oxide powder inlet (4) is provided at the input end of the first-stage spiral conveyor agitator, and the calcium oxide powder inlet is connected to the calcium oxide powder feeding hopper. A second-stage agitator inlet is provided at the input end of the second-stage spiral conveyor agitator, and a third-stage agitator inlet is provided at the input end of the third-stage spiral conveyor agitator. A calcium hydroxide outlet is provided at the output end of the third-stage spiral conveyor agitator, and the calcium hydroxide outlet is connected to the calcium hydroxide powder receiving hopper. The output port of the first-stage spiral conveyor agitator is connected to the inlet of the second-stage agitator, and the output port of the second-stage spiral conveyor agitator is connected to the inlet of the third-stage agitator. A first agitator spray nozzle is provided at the input end of the first-stage spiral conveyor agitator, and a second-stage spiral conveyor agitator is connected to the inlet of the third-stage agitator. The input end of the first stage is equipped with a second agitator spray nozzle, and the input end of the third stage screw conveyor agitator is equipped with a third agitator spray nozzle. The first, second, and third agitator spray nozzles are connected to the spray water system. Calcium oxide powder enters the first stage screw conveyor agitator through the calcium oxide powder inlet. A high-temperature steam exhaust port is provided at the output end of the first stage screw conveyor agitator, and an induced draft fan is connected to the high-temperature steam exhaust port. A high-temperature steam conveying pipeline is connected to the output end of the induced draft fan. A high-temperature steam circulation inlet is provided at the input end of the second stage screw conveyor agitator, and a high-temperature steam circulation conveying branch pipe is connected to the high-temperature steam circulation conveying branch pipe. The other end of the high-temperature steam circulation conveying branch pipe is connected to the high-temperature steam circulation inlet.

[0009] A high-temperature steam outlet for the tail of the second agitator is provided at the output end of the second-stage screw conveyor agitator, and a high-temperature steam outlet for the tail of the third agitator is provided at the output end of the third-stage screw conveyor agitator. High-temperature steam inlets for the tail of the second and third agitators are respectively provided at the input end of the first-stage screw conveyor agitator. A high-temperature steam outlet pipe for the tail of the second agitator is provided between the two outlets, and a high-temperature steam outlet pipe for the tail of the third agitator is provided between the two outlets. A cooling air inlet is provided at the input end of the third-stage screw conveyor agitator, and a cooling air inlet pipe is connected to the cooling air inlet. The other end of the cooling air inlet pipe is connected to the exhaust pipe of the hot blast furnace.

[0010] A method for operating a trans-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, characterized by the following steps:

[0011] When it is necessary to store electrical energy as thermal energy across seasons: the electromagnetic rotary kiln is turned on, and the calcium hydroxide powder in the calcium hydroxide powder feeding hopper is fed into the electromagnetic rotary kiln. The calcium hydroxide powder in the rotating cylinder is decomposed into calcium oxide powder and hot water by the electromagnetic heating hood. The decomposed calcium oxide powder is output and enters the calcium oxide powder receiving hopper. The decomposed hot water is heated by the electromagnetic heating hood and then led out by the steam blower to the hot water storage tank, thereby converting and storing electrical energy in the calcium oxide powder and hot water.

[0012] When it is necessary to release the heat energy stored in the calcium oxide powder: the calcium oxide powder receiving hopper is conveyed to the calcium oxide powder feeding hopper through the calcium oxide powder conveying and lifting system. The quicklime digester and spray water system are started. The calcium oxide powder in the calcium oxide powder feeding hopper enters the quicklime digester. It is stirred and pushed by the rotation of three sets of spiral stirring blades in sequence. After the calcium oxide powder comes into contact with water, it undergoes a chemical reaction to generate calcium hydroxide and high-temperature steam. The calcium hydroxide powder is output from the calcium hydroxide outlet to the calcium hydroxide powder receiving hopper. The high-temperature steam is drawn out of the first-stage spiral conveying agitator into the high-temperature steam conveying pipeline by the suction of the induced draft fan and is output to the heat system.

[0013] The calcium hydroxide powder output to the calcium hydroxide powder receiving hopper is conveyed by a chain conveyor to the calcium hydroxide powder feeding hopper, thereby realizing the recycling and utilization of calcium hydroxide and calcium oxide.

[0014] This invention utilizes a calcium oxide-calcium hydroxide process with a rationally designed heat storage and release flow to achieve cross-seasonal heat storage and peak-shaving heat storage and release applications in coal-fired power plants. The invention employs an electromagnetic rotary kiln to calcine calcium hydroxide into calcium oxide, converting electrical energy into stored energy within the calcium oxide. A digester system is used to produce calcium hydroxide from the calcium oxide, generating high-temperature gas that releases the stored heat energy. This achieves the cyclical conversion of the two substances and the cross-seasonal storage and release of heat energy, effectively meeting all the conditions for long-term cross-seasonal heat storage. It boasts advantages such as high heat storage density, long storage time, and no heat loss, and has significant development potential for future applications in cross-seasonal heat storage, solar heat storage, and peak-shaving heat storage for wind and photovoltaic power plants. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the digester of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings:

[0018] A transseasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide includes an electromagnetic rotary kiln, a quicklime digester, calcium oxide powder, and calcium hydroxide powder. The electromagnetic kiln consists of a rotating cylinder 24 and an electromagnetic heating hood 25. The quicklime digester is composed of a first-stage spiral conveyor agitator 1, a second-stage spiral conveyor agitator 2, and a third-stage spiral conveyor agitator 3 connected end to end. A calcium hydroxide powder feeding hopper 26 is provided at the feed end of the electromagnetic rotary kiln, and a calcium oxide powder receiving hopper 27 is provided at the discharge end of the electromagnetic rotary kiln. A calcium oxide powder feeding hopper 32 is provided at the feed end of the quicklime digester, and a calcium hydroxide powder receiving hopper 33 is provided at the discharge end of the quicklime digester. The calcium hydroxide powder feeding hopper 26 and the calcium hydroxide powder receiving hopper 33 are connected. A chain-type material conveyor 35 is installed between the calcium oxide powder receiving hopper 27 and the calcium oxide powder feeding hopper 32. A calcium oxide powder conveying and lifting system 36 is installed between the calcium oxide powder receiving hopper 27 and the calcium oxide powder feeding hopper 32. A steam outlet 28 is installed at the discharge end of the electromagnetic rotary kiln. A steam outlet pipe 29 is connected to the steam outlet 28. The other end of the steam outlet pipe 29 is installed in the hot water storage tank 31. A steam induced draft fan 30 is installed on the steam outlet pipe 29. A spray water system 37 is installed in the quicklime digester. A high-temperature steam exhaust port 11 is installed on the quicklime digester. An induced draft fan 12 is connected to the high-temperature steam exhaust port 11. A high-temperature steam conveying pipeline 13 is connected to the output end of the induced draft fan. The high-temperature steam conveying pipeline 13 is output to the heat system after passing through the hot air furnace 34.

[0019] A calcium oxide powder inlet 4 is provided at the input end of the first-stage spiral conveyor agitator 1, and the calcium oxide powder inlet 4 is connected to the calcium oxide powder feeding hopper 32. A second-stage agitator inlet 5 is provided at the input end of the second-stage spiral conveyor agitator 2, and a third-stage agitator inlet 6 is provided at the input end of the third-stage spiral conveyor agitator 3. A calcium hydroxide outlet 7 is provided at the output end of the third-stage spiral conveyor agitator 3, and the calcium hydroxide outlet 7 is connected to the calcium hydroxide powder receiving hopper 33. The output port of the first-stage spiral conveyor agitator 1 is connected to the second-stage agitator inlet 5, and the output port of the second-stage spiral conveyor agitator 2 is connected to the third-stage agitator inlet 6. A first agitator spray nozzle 8 is provided at the input end of the first-stage spiral conveyor agitator 1, and a second agitator spray nozzle 8 is provided at the input end of the second-stage spiral conveyor agitator 2. The second agitator spray nozzle 9 is provided at the input end of the third-stage spiral conveyor agitator 3, and the first agitator spray nozzle 8, the second agitator spray nozzle 9, and the third agitator spray nozzle 10 are respectively connected to the spray water system 37. Calcium oxide powder enters the first-stage spiral conveyor agitator 1 through the calcium oxide powder inlet 4. A high-temperature steam exhaust port 11 is provided at the output end of the first-stage spiral conveyor agitator 1, and an induced draft fan 12 is connected to the high-temperature steam exhaust port 11. A high-temperature steam conveying pipeline 13 is connected to the output end of the induced draft fan. A high-temperature steam circulation inlet 15 is provided at the input end of the second-stage spiral conveyor agitator 2, and a high-temperature steam circulation conveying branch pipe 14 is connected to the high-temperature steam circulation conveying pipeline 13. The other end of the high-temperature steam circulation conveying branch pipe 14 is connected to the high-temperature steam circulation inlet 15.

[0020] A high-temperature steam outlet 17 for the tail of the second-stage spiral conveyor agitator 2 is provided at the output end of the second-stage spiral conveyor agitator 2, and a high-temperature steam outlet 20 for the tail of the third-stage spiral conveyor agitator 3 is provided at the output end of the third-stage spiral conveyor agitator 3. A high-temperature steam inlet 19 for the tail of the second-stage spiral conveyor agitator and a high-temperature steam inlet 22 for the tail of the third-stage spiral conveyor agitator are respectively provided at the input end of the first-stage spiral conveyor agitator 1. A high-temperature steam outlet pipe 18 for the tail of the second-stage spiral conveyor agitator is provided between the high-temperature steam outlet 17 and the high-temperature steam inlet 19 for the tail of the second-stage spiral conveyor agitator, and a high-temperature steam outlet pipe 21 for the tail of the third-stage spiral conveyor agitator is provided between the high-temperature steam inlet 22 and the high-temperature steam outlet 20 for the tail of the third-stage spiral conveyor agitator 3. A cooling air inlet 16 is provided at the input end of the third-stage spiral conveyor agitator 3, and a cooling air inlet pipe 23 is connected to the cooling air inlet 16. The other end of the cooling air inlet pipe 23 is connected to the exhaust pipe of the hot air furnace 34.

[0021] A method for operating a trans-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, characterized by the following steps:

[0022] When it is necessary to store electrical energy as thermal energy across seasons: the electromagnetic rotary kiln is turned on, and the calcium hydroxide powder in the calcium hydroxide powder feeding hopper 26 is fed into the electromagnetic rotary kiln. The calcium hydroxide powder in the rotating cylinder 24 is decomposed into calcium oxide powder and hot water by the electromagnetic heating cover 25. The decomposed calcium oxide powder is output and enters the calcium oxide powder receiving hopper 27. The decomposed hot water is heated by the electromagnetic heating cover 25 and then led out by the steam blower 30 to the hot water storage tank 31, thereby converting and storing electrical energy in the calcium oxide powder and the hot water storage tank.

[0023] When it is necessary to release the heat energy stored in the calcium oxide powder: the calcium oxide powder in the calcium oxide powder receiving hopper 27 is transferred to the calcium oxide powder feeding hopper 32 through the calcium oxide powder conveying and lifting system 36. The quicklime digester and spray water system 37 are started. The calcium oxide powder in the calcium oxide powder feeding hopper 32 enters the quicklime digester. It is stirred and pushed by the rotation of three sets of spiral stirring blades in sequence. After the calcium oxide powder comes into contact with water, it undergoes a chemical reaction to generate calcium hydroxide and high-temperature steam. The calcium hydroxide powder is output from the calcium hydroxide outlet 7 to the calcium hydroxide powder receiving hopper 33. The high-temperature steam is drawn out of the first-stage spiral conveying agitator 1 by the suction of the blower 12 and is sent to the high-temperature steam conveying pipeline 13 and output to the heat system.

[0024] The calcium hydroxide powder output to the calcium hydroxide powder receiving hopper 33 is conveyed by the chain material conveyor 35 to the calcium hydroxide powder feeding hopper 26, thereby realizing the recycling and utilization of calcium hydroxide and calcium oxide.

[0025] The following provides a detailed description of the chemical heat pump based on a three-stage digester of calcium oxide and calcium hydroxide in a trans-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide:

[0026] A chemical heat pump based on a three-stage digester of calcium oxide and calcium hydroxide includes a first-stage spiral conveyor agitator 1, a second-stage spiral conveyor agitator 2, a third-stage spiral conveyor agitator 3, and calcium oxide powder. A calcium oxide powder inlet 4 is located at the input end of the first-stage spiral conveyor agitator 1, a second-stage agitator inlet 5 is located at the input end of the second-stage spiral conveyor agitator 2, a third-stage agitator inlet 6 is located at the input end of the third-stage spiral conveyor agitator 3, and a calcium hydroxide outlet 7 is located at the output end of the third-stage spiral conveyor agitator 3. The three spiral conveyor agitators are connected end-to-end. A closed, serpentine material conveying shell is formed. The output port of the first-stage spiral conveyor agitator 1 is connected to the inlet 5 of the second-stage agitator, and the output port of the second-stage spiral conveyor agitator 2 is connected to the inlet 6 of the third-stage agitator. The material entering from the calcium oxide powder inlet 4 is sequentially stirred and pushed by the rotation of the three sets of spiral agitator blades, and then output from the calcium hydroxide outlet 7. A first agitator spray nozzle 8 is provided at the input end of the first-stage spiral conveyor agitator 1, and a second agitator spray nozzle 9 is provided at the input end of the second-stage spiral conveyor agitator 2. The input end of the mixer 3 is equipped with a third mixer spray nozzle 10, and each of the three mixer spray nozzles is connected to a water sprayer. Calcium oxide powder enters the first-stage screw conveyor mixer 1 through the calcium oxide powder inlet 4. A high-temperature steam exhaust port 11 is provided at the output end of the first-stage screw conveyor mixer 1, and an induced draft fan 12 is connected to the high-temperature steam exhaust port 11. A high-temperature steam conveying pipeline 13 is connected to the output end of the induced draft fan. The high-temperature steam in the first-stage screw conveyor mixer 1 is drawn out into the high-temperature steam conveying pipeline 13 by the suction force of the induced draft fan 12, thus making full use of this heat. A high-temperature steam circulation inlet 15 is provided at the input end of the second-stage screw conveyor agitator 2. A high-temperature steam circulation conveying branch pipe 14 is connected to the high-temperature steam conveying pipeline 13. The other end of the high-temperature steam circulation conveying branch pipe 14 is connected to the high-temperature steam circulation inlet 15, so that this part of high-temperature steam is introduced into the input end of the second-stage screw conveyor agitator 2 to achieve full chemical reaction of the calcium oxide that has not undergone chemical reaction in the second-stage screw conveyor agitator 2. A calcium hydroxide silo is provided below the calcium hydroxide outlet 7, and the generated calcium hydroxide powder is collected in the calcium hydroxide silo.

[0027] A high-temperature steam outlet 17 for the tail of the second-stage spiral conveyor agitator 2 is provided at the output end, and a high-temperature steam outlet 20 for the tail of the third-stage spiral conveyor agitator 3 is provided at the output end. A high-temperature steam inlet 19 for the tail of the second agitator and a high-temperature steam inlet 22 for the tail of the third agitator are respectively provided at the input end of the first-stage spiral conveyor agitator 1. A high-temperature steam outlet pipe 18 for the tail of the second agitator is provided between the high-temperature steam outlet 17 and the high-temperature steam inlet 19 for the tail of the second agitator, and a high-temperature steam outlet pipe 21 for the tail of the third agitator is provided between the high-temperature steam inlet 22 and the high-temperature steam outlet 20 for the tail of the third agitator. The high-temperature steam from the tail of the second agitator is introduced into the input end of the first-stage spiral conveyor agitator 1 to agitate the water in the input end of the first-stage spiral conveyor agitator 1. Heat is generated to produce high-temperature steam. This high-temperature steam is output from the high-temperature steam exhaust port 11 and enters the high-temperature steam conveying pipeline 13. A portion of it is then drawn back to the input end of the second-stage spiral conveying agitator 2. After being heated by the heat of chemical reaction in the second-stage spiral conveying agitator 2, it is introduced into the input end of the first-stage spiral conveying agitator 1 through the high-temperature steam outlet pipe 18 at the tail of the second agitator. This cycle is repeated, thus ensuring that the heat of chemical reaction in the three-stage digester is fully absorbed into the high-temperature steam. The heat energy released by the chemical reaction that converts calcium oxide into calcium hydroxide is stored in the high-temperature steam and then fully utilized after being drawn out. A cooling air inlet 16 is provided at the input end of the third-stage spiral conveying agitator 3. A cooling air inlet pipe 23 is connected to the cooling air inlet 16. The other end of the cooling air inlet pipe 23 is connected to the hot air furnace exhaust pipe to reduce the temperature of the output calcium hydroxide powder.

[0028] The following provides a detailed explanation of the operation method of the chemical heat pump based on a three-stage digester of calcium oxide and calcium hydroxide in a trans-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide:

[0029] A method for operating a chemical heat pump based on a three-stage digester of calcium oxide and calcium hydroxide, wherein the first-stage spiral conveying agitator 1, the second-stage spiral conveying agitator 2, and the third-stage spiral conveying agitator 3 are simultaneously started, characterized by the following steps:

[0030] Step 1: Add calcium oxide powder through calcium oxide powder inlet 4 to the input end of the first-stage screw conveyor agitator 1, turn on the first water sprayer connected to the first agitator spray nozzle 8, spray water onto the calcium oxide powder entering the input end of the first-stage screw conveyor agitator 1, the water and calcium oxide powder react chemically to generate calcium hydroxide, and heat the water that has not participated in the chemical reaction.

[0031] In the second step, the unreacted calcium oxide powder, heated water, and the generated calcium hydroxide first-stage mixture are conveyed to the output end of the first-stage spiral conveyor agitator 1 as the spiral agitator blades rotate. During this process, some of the unreacted calcium oxide powder continues to react chemically with the heated water, continuing to release heat and heating the water into steam. The generated steam is drawn into the high-temperature steam conveying pipeline 13 by the induced draft fan through the high-temperature steam exhaust port 11.

[0032] Third, the first-stage mixture, which is conveyed to the output end of the first-stage screw conveyor agitator 1, enters the input end of the second-stage screw conveyor agitator 2 through the feed inlet 5 of the second-stage agitator. The second water sprayer connected to the water spray nozzle 9 of the second agitator is activated to spray water onto the first-stage mixture. The sprayed water reacts with the calcium oxide powder in the first-stage mixture to generate calcium hydroxide and release heat. At the same time, a portion of the steam in the high-temperature steam conveying pipeline 13 enters the input end of the second-stage screw conveyor agitator 2 through the high-temperature steam circulation conveying branch pipe 14 and the high-temperature steam circulation steam inlet 15 to heat the first-stage mixture.

[0033] Fourth step: The first-stage mixture in the input end of the second-stage spiral conveyor agitator 2 is conveyed to the output end of the second-stage spiral conveyor agitator 2 as the spiral agitator blades rotate. During this process, some unreacted calcium oxide powder reacts chemically with the water sprayed from the second water sprayer and the steam entering through the high-temperature steam circulation inlet 15 to continue generating calcium hydroxide and continue to release heat, which heats the steam in the second-stage spiral conveyor agitator 2.

[0034] Step 5: The second-stage mixture, which is conveyed to the output end of the second-stage screw conveyor mixer 2, enters the input end of the third-stage screw conveyor mixer 3 through the feed port 6 of the third-stage mixer. The heated steam enters the input end of the first-stage screw conveyor mixer 1 through the high-temperature steam outlet 17 at the tail of the second mixer, the high-temperature steam outlet pipe 18 at the tail of the second mixer, and the high-temperature steam inlet 19 at the tail of the second mixer.

[0035] Step 6: The second-stage mixture, which is conveyed to the output end of the second-stage screw conveyor agitator 2, enters the input end of the third-stage screw conveyor agitator 3 through the feed port 6 of the third-stage agitator. As the screw agitator blades in the third-stage screw conveyor agitator 3 rotate, the mixture is conveyed to the output end of the third-stage screw conveyor agitator 3 and output from the calcium hydroxide discharge port 7 to the calcium hydroxide silo. At the same time, the cooling air from the hot blast furnace exhaust pipe enters the first-stage screw conveyor agitator 1 through the cooling air inlet pipe 23 and the cooling air inlet 16 to cool the generated calcium hydroxide.

[0036] Start the third water sprayer connected to the third agitator spray nozzle 10 to spray water onto the second-stage mixture entering the input end of the third-stage spiral conveyor agitator 3; connect the high-temperature steam outlet pipe 21 at the tail of the third agitator to introduce the steam from the output end of the third-stage spiral conveyor agitator 3 into the input end of the first-stage spiral conveyor agitator 1; the above two measures can be used as supplementary measures for the entire reaction process; control whether the third-stage digester sprays water and the amount of water sprayed according to the digestion status of the material falling from the discharge port of the third-stage digester.

Claims

1. A trans-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, comprising an electromagnetic rotary kiln, a quicklime digester, calcium oxide powder, and calcium hydroxide powder; the electromagnetic kiln is composed of a rotating cylinder (24) and an electromagnetic heating hood (25); the quicklime digester is composed of a first-stage spiral conveying agitator (1), a second-stage spiral conveying agitator (2), and a third-stage spiral conveying agitator (3) connected end to end in sequence, characterized in that, A calcium hydroxide powder feeding hopper (26) is provided at the feed end of the electromagnetic rotary kiln, a calcium oxide powder receiving hopper (27) is provided at the discharge end of the electromagnetic rotary kiln, a calcium oxide powder feeding hopper (32) is provided at the feed end of the quicklime slaking unit, a calcium hydroxide powder receiving hopper (33) is provided at the discharge end of the quicklime slaking unit, a chain conveyor (35) is provided between the calcium hydroxide powder feeding hopper (26) and the calcium hydroxide powder receiving hopper (33), and a calcium oxide powder conveying and lifting system (36) is provided between the calcium oxide powder receiving hopper (27) and the calcium oxide powder feeding hopper (32); a calcium oxide powder receiving hopper (27) and a calcium oxide powder feeding hopper (32) are provided at the discharge end of the electromagnetic rotary kiln. There is a steam outlet (28), and a steam outlet pipe (29) is connected to the steam outlet (28). The other end of the steam outlet pipe (29) is set in the hot water storage tank (31). A steam induced draft fan (30) is set on the steam outlet pipe (29). A spray water system (37) is set in the quicklime digester. A high temperature steam exhaust port (11) is set on the quicklime digester. An induced draft fan (12) is connected to the high temperature steam exhaust port (11). A high temperature steam transmission pipeline (13) is connected to the output end of the induced draft fan. The high temperature steam transmission pipeline (13) is output to the heat system after passing through the hot air furnace (34).

2. The transseasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide according to claim 1, characterized in that, A calcium oxide powder inlet (4) is provided at the input end of the first-stage spiral conveyor agitator (1), and the calcium oxide powder inlet (4) is connected to the calcium oxide powder feeding hopper (32). A second-stage agitator inlet (5) is provided at the input end of the second-stage spiral conveyor agitator (2). A third-stage agitator inlet (6) is provided at the input end of the third-stage spiral conveyor agitator (3). A calcium hydroxide outlet (7) is provided at the output end of the third-stage spiral conveyor agitator (3), and the calcium hydroxide outlet (7) is connected to the calcium hydroxide powder receiving hopper (33). The output port of the first-stage spiral conveyor agitator (1) is connected to the second-stage agitator inlet (5), and the output port of the second-stage spiral conveyor agitator (2) is connected to the third-stage agitator inlet (6). A first agitator spray nozzle (8) is provided at the input end of the first-stage spiral conveyor agitator (1), and a second agitator spray nozzle (8) is provided at the input end of the second-stage spiral conveyor agitator (2). The second agitator spray nozzle (9) is provided at the input end of the third-stage spiral conveyor agitator (3). The first agitator spray nozzle (8), the second agitator spray nozzle (9) and the third agitator spray nozzle (10) are connected to the spray water system (37) respectively. Calcium oxide powder enters the first-stage spiral conveyor agitator (1) through the calcium oxide powder inlet (4). A high-temperature steam exhaust port (11) is provided at the output end of the first-stage spiral conveyor agitator (1). An induced draft fan (12) is connected to the high-temperature steam exhaust port (11). A high-temperature steam conveying pipeline (13) is connected to the output end of the induced draft fan. A high-temperature steam circulation inlet (15) is provided at the input end of the second-stage spiral conveyor agitator (2). A high-temperature steam circulation conveying branch pipe (14) is connected to the high-temperature steam conveying pipeline (13). The other end of the high-temperature steam circulation conveying branch pipe (14) is connected to the high-temperature steam circulation inlet (15).

3. The transseasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide according to claim 2, characterized in that, A high-temperature steam outlet (17) for the tail of the second agitator is provided at the output end of the second-stage spiral conveyor agitator (2), and a high-temperature steam outlet (20) for the tail of the third agitator is provided at the output end of the third-stage spiral conveyor agitator (3). A high-temperature steam inlet (19) for the tail of the second agitator and a high-temperature steam inlet (22) for the tail of the third agitator are respectively provided at the input end of the first-stage spiral conveyor agitator (1). The high-temperature steam outlet (17) for the tail of the second agitator and the high-temperature steam inlet (22) for the tail of the third agitator are located at the output end of the first-stage spiral conveyor agitator (1). A high-temperature steam outlet pipe (18) is provided between the tail end of the second stirrer and the tail end of the third stirrer. A high-temperature steam outlet pipe (21) is provided between the tail end of the third stirrer and the tail end of the third stirrer. A cooling air inlet (16) is provided at the input end of the third-stage spiral conveyor stirrer (3). A cooling air inlet pipe (23) is connected to the cooling air inlet pipe (16). The other end of the cooling air inlet pipe (23) is connected to the exhaust pipe of the hot air furnace (34).

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