Cross-season heat storage and release system for cyclic conversion of calcium hydroxide and calcium oxide and working method

Abstract

The invention discloses a cross-season heat storage and release system for cyclic conversion of calcium hydroxide and calcium oxide and a working method. 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] The invention relates to an electromagnetic kiln for calcining calcium hydroxide to generate calcium oxide and a quicklime digester for generating calcium hydroxide from calcium oxide, and in particular to a cross-season heat storage and release system and a working method for cyclic conversion of calcium hydroxide and calcium oxide. Background Art

[0002] The "dual carbon target" is the country's development strategy. Green electricity will replace existing thermal power generation and become the main force of electric energy. The instability of wind power and photovoltaic power and the peak and valley effects of the power grid all require power conversion and energy storage technology to deal with. The existing power storage technology is severely limited by the high cost and high risk of large-scale power storage. At present, thermal power units use electric boilers plus water tanks for heat storage or molten salt heat storage for deep peak regulation. Electric boilers plus water tanks for heat storage have high energy and low usage. In addition to unreasonable energy usage, the economic benefits are also relatively poor. Molten salt heat storage can generate steam, and its energy usage is more reasonable than that of electric boilers plus hot water storage tanks, but it has the defects of large investment and poor economic benefits. The above two methods of converting electricity into thermal energy can only meet the daily storage and daily consumption model, and cannot achieve long-term Time energy storage; in recent years, the emerging heat storage technology is inter-seasonal heat storage technology; inter-seasonal heat storage uses reversible thermochemical reactions to store and release heat, which can store heat for a long time without loss, and can store summer solar energy for use in winter, which can improve the quality of thermal energy, can be used for grid peak regulation, and can be coupled with thermal power units; for example, calcium hydroxide is dehydrated to form calcium oxide, which can complete heat storage, and its reverse reaction can release heat; due to the low price of lime and high heat storage density, the heat storage density is 4-6 times that of water heat storage and 3-5 times that of molten salt heat storage. No three wastes are generated during the storage and release process, and energy can be stored at room temperature and pressure. The safety performance is controllable and suitable for large-scale energy storage; but how to economically, scientifically and reasonably convert calcium hydroxide into calcium oxide to achieve inter-seasonal heat storage is a topic faced on site.

[0003] At present, the research on thermochemical energy storage system is still in the laboratory stage. The conversion of calcium hydroxide and calcium oxide belongs to the thermochemical energy storage system. The building materials industry generally uses the process of mixing calcium oxide (quicklime) with water to generate calcium hydroxide (slaked lime). The industry generally completes the above process through the equipment of quicklime digester. The focus of the whole process is on the pursuit of slaked lime products. For the high-temperature steam generated in the process, it is only from the perspective of environmental protection, with the research direction of not generating environmental pollution, and no attention is paid to the generation and scientific utilization of high-temperature steam heat energy. For the process of converting quicklime into slaked lime, how to effectively utilize the heat of the generated byproduct high-temperature steam has become a new research topic.

[0004] Thermochemical energy storage is the use of reversible thermochemical reactions to store energy through the mutual conversion of thermal energy and chemical energy. Solid calcium hydroxide undergoes a dehydration decomposition reaction when heated, and stores the received heat in the form of chemical energy in the decomposition product calcium oxide and water. When thermal energy is needed, water is input into the reactor storing calcium oxide, that is, a reverse hydration reaction occurs to generate calcium hydroxide. At the same time, the stored chemical energy can be reversed into thermal energy and released. 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. At present, more than 70 thermochemical energy storage systems have been studied, among which the mutual conversion system of calcium hydroxide and calcium oxide has become one of the first choices for thermochemical energy storage systems due to its high energy storage density, fast thermal energy storage and release speed, and stable, safe, non-toxic, low price and easy handling. How to convert electrical energy into thermal energy across seasons and realize the cyclic utilization of heat storage and heat release is a new research topic. Summary of the invention

[0005] The present invention provides a cross-season heat storage and release system and a working method for cyclic conversion of calcium hydroxide and calcium oxide, thereby realizing cross-season conversion and efficient utilization of electric energy.

[0006] The present invention solves the above technical problems through the following technical solutions: A cross-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide comprises an electromagnetic rotary kiln, a quicklime digester, calcium oxide powder and calcium hydroxide powder; the electromagnetic kiln is composed of a rotating cylinder and an electromagnetic heating cover; the quicklime digester is composed of a first-stage screw conveying stirrer, a second-stage screw conveying stirrer and a third-stage screw conveying stirrer connected end to end in sequence; a calcium hydroxide powder feeding hopper is arranged at the feeding end of the electromagnetic rotary kiln, a calcium oxide powder receiving hopper is arranged at the discharging end of the electromagnetic rotary kiln, a calcium oxide powder feeding hopper is arranged at the feeding end of the quicklime digester, a calcium hydroxide powder receiving hopper is arranged at the discharging end of the quicklime digester, and a calcium hydroxide powder feeding hopper and a calcium hydroxide powder receiving hopper are arranged at the feeding end of the quicklime digester. A chain material conveyor is arranged between the calcium hydroxide powder receiving hoppers, and a calcium oxide powder conveying and lifting system is arranged between the calcium oxide powder receiving hopper and the calcium oxide powder supply hopper; a water vapor outlet is arranged at the discharge end of the electromagnetic rotary kiln, a water vapor outlet is connected to a water vapor outlet, the other end of the water vapor outlet pipe is arranged in the hot water stored in the hot water storage tank, and a water vapor induced draft fan is arranged on the water vapor outlet pipe; a spray water system is arranged in the quicklime digester, a high-temperature steam exhaust port is arranged on the quicklime digester, a high-temperature steam exhaust port is connected to an induced draft fan, a high-temperature steam delivery pipeline is connected to the output end of the induced draft fan, and the high-temperature steam delivery pipeline is output to the heat using system after passing through the hot blast furnace.

[0007] A calcium oxide powder feed port (4) is provided at the input end of the first-stage screw conveying agitator, and the calcium oxide powder feed port is connected to the calcium oxide powder supply hopper; a second-stage agitator feed port is provided at the input end of the second-stage screw conveying agitator; a third-stage agitator feed port is provided at the input end of the third-stage screw conveying agitator; a calcium hydroxide discharge port is provided at the output end of the third-stage screw conveying agitator, and the calcium hydroxide discharge port is connected to the calcium hydroxide powder receiving hopper; the output port of the first-stage screw conveying agitator is connected to the second-stage agitator feed port; the output port of the second-stage screw conveying agitator is connected to the third-stage agitator feed port; a first agitator water spray port is provided at the input end of the first-stage screw conveying agitator, and a third-stage agitator feed port is provided at the input end of the second-stage screw conveying agitator. A second agitator water spray port is provided at the input end of the third-stage screw conveying agitator, a third agitator water spray port is provided at the input end of the third-stage screw conveying agitator, the first agitator water spray port, the second agitator water spray port and the third agitator water spray port are respectively connected to the spray water system, the calcium oxide powder enters the first-stage screw conveying agitator through the calcium oxide powder feed port, a high-temperature steam exhaust port is provided at the output end of the first-stage screw conveying agitator, an induced draft fan is connected to the high-temperature steam exhaust port, and a high-temperature steam delivery pipeline is connected to the output end of the induced draft fan; a high-temperature steam circulation steam inlet is provided at the input end of the second-stage screw conveying agitator, a high-temperature steam circulation delivery branch pipe is connected to the high-temperature steam delivery pipeline, and the other end of the high-temperature steam circulation delivery branch pipe is connected to the high-temperature steam circulation steam inlet.

[0008] A second agitator tail high-temperature steam outlet is provided at the output end of the second-stage screw conveying agitator, a third agitator tail high-temperature steam outlet is provided at the output end of the third-stage screw conveying agitator, a second agitator tail high-temperature steam inlet and a third agitator tail high-temperature steam inlet are provided at the input end of the first-stage screw conveying agitator, respectively, a second agitator tail high-temperature steam outlet is provided between the second agitator tail high-temperature steam inlet and the second agitator tail high-temperature steam outlet, a third agitator tail high-temperature steam outlet is provided between the third agitator tail high-temperature steam inlet and the third agitator tail high-temperature steam outlet; a cooling air inlet is provided at the input end of the third-stage screw conveying agitator, a cooling air inlet pipe is connected to the cooling air inlet, and the other end of the cooling air inlet pipe is connected to the exhaust pipe of the hot air furnace.

[0009] A working method of a cross-season heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, characterized by the following steps: When it is necessary to store electric energy as heat energy across seasons: the electromagnetic rotary kiln is turned on, and the calcium hydroxide powder in the calcium hydroxide powder supply hopper is input into the electromagnetic rotary kiln, and the calcium hydroxide powder in the rotating cylinder is decomposed into calcium oxide powder and hot water by the electromagnetic heating cover, and the decomposed calcium oxide powder is output and then enters the calcium oxide powder receiving hopper, and the decomposed hot water is heated by the electromagnetic heating cover and then led out by the steam induced draft fan to the hot water stored in the hot water storage tank, thereby converting the electric energy into the calcium oxide powder and the hot water storage; When the heat energy stored in the calcium oxide powder needs to be released: the calcium oxide powder in the calcium oxide powder receiving hopper is conveyed to the calcium oxide powder supply hopper through the calcium oxide powder conveying and lifting system, the quicklime smelter and the spray water system are started, the calcium oxide powder in the calcium oxide powder supply hopper enters the quicklime smelter, and is successively stirred and pushed by three groups of spiral stirring blades. The calcium oxide powder reacts chemically with water to generate calcium hydroxide and high-temperature steam, and the calcium hydroxide powder is output from the calcium hydroxide discharge port to the calcium hydroxide powder receiving hopper. The high-temperature steam is sucked out of the first-stage spiral conveying stirrer into the high-temperature steam conveying pipeline by the suction force of the induced draft fan, and is output to the heat-using system; The calcium hydroxide powder output into the calcium hydroxide powder receiving hopper is conveyed to the calcium hydroxide powder supply hopper by the chain material conveyor, thereby realizing the circular conversion and utilization of calcium hydroxide and calcium oxide.

[0010] The present invention adopts calcium oxide-calcium hydroxide to realize the application of cross-season heat storage and peak-shaving heat storage and release in coal-fired power plants through a reasonably designed process of heat storage and release; the present invention adopts an electromagnetic rotary kiln to calcine calcium hydroxide to convert it into calcium oxide. The process system realizes the conversion of electrical energy into calcium oxide, and adopts a digester system for calcium oxide to produce calcium hydroxide and generate high-temperature gas, and releases the heat energy stored in calcium oxide, thereby realizing the cyclic conversion of the two substances and the cross-season storage and release of heat energy, and better meets all conditions for long-term cross-season heat storage; it has the advantages of high heat storage density, long heat storage time and no heat loss, and has great development potential in the future in cross-season heat storage, solar energy heat storage, wind power, and photovoltaic power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic structural diagram of a digester of the present invention. DETAILED DESCRIPTION

[0012] The present invention is described in detail below in conjunction with the accompanying drawings: A cross-season 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 cover 25; the quicklime digester is composed of a first-stage spiral conveying stirrer 1, a second-stage spiral conveying stirrer 2 and a third-stage spiral conveying stirrer 3 connected end to end in sequence, a calcium hydroxide powder feeding hopper 26 is arranged at the feeding end of the electromagnetic rotary kiln, a calcium oxide powder receiving hopper 27 is arranged at the discharging end of the electromagnetic rotary kiln, a calcium oxide powder feeding hopper 32 is arranged at the feeding end of the quicklime digester, a calcium hydroxide powder receiving hopper 33 is arranged at the discharging end of the quicklime digester, and a calcium hydroxide powder feeding hopper 26 and a calcium hydroxide powder receiving hopper 33 are arranged between the calcium hydroxide powder feeding hopper 26 and the calcium hydroxide powder receiving hopper 33. A chain material conveyor 35 is arranged between the calcium oxide powder receiving hopper 27 and the calcium oxide powder supply hopper 32, and a calcium oxide powder conveying and lifting system 36 is arranged between the calcium oxide powder receiving hopper 27 and the calcium oxide powder supply hopper 32; a water vapor outlet 28 is arranged at the discharge end of the electromagnetic rotary kiln, and a water vapor outlet pipe 29 is connected to the water vapor outlet 28, and the other end of the water vapor outlet pipe 29 is arranged in the hot water stored in the hot water storage tank 31, and a water vapor induced draft fan 30 is arranged on the water vapor outlet pipe 29; a spray water system 37 is arranged in the quicklime smelter, a high-temperature steam exhaust port 11 is arranged on the quicklime smelter, and an induced draft fan 12 is connected to the high-temperature steam exhaust port 11, and a high-temperature steam delivery pipeline 13 is connected to the output end of the induced draft fan, and the high-temperature steam delivery pipeline 13 is output to the heat using system after passing through the hot blast furnace 34.

[0013] A calcium oxide powder feeding port 4 is provided at the input end of the first-stage screw conveying agitator 1, and the calcium oxide powder feeding port 4 is connected to the calcium oxide powder supply hopper 32; a second-stage agitator feeding port 5 is provided at the input end of the second-stage screw conveying agitator 2; a third-stage agitator feeding port 6 is provided at the input end of the third-stage screw conveying agitator 3; a calcium hydroxide discharge port 7 is provided at the output end of the third-stage screw conveying agitator 3, and the calcium hydroxide discharge port 7 is connected to the calcium hydroxide powder receiving hopper 33; the output port of the first-stage screw conveying agitator 1 is connected to the second-stage agitator feeding port 5, and the output port of the second-stage screw conveying agitator 2 is connected to the third-stage agitator feeding port 6; a first agitator water spray port 8 is provided at the input end of the first-stage screw conveying agitator 1, and a second-stage screw conveying agitator 2 is provided at the input end of the second-stage screw conveying agitator 2. A second agitator water spray port 9 is provided at the input end of the third-stage screw conveying agitator 3. The first agitator water spray port 8, the second agitator water spray port 9 and the third agitator water spray port 10 are respectively connected to the spray water system 37. The calcium oxide powder enters the first-stage screw conveying agitator 1 through the calcium oxide powder feed port 4. A high-temperature steam exhaust port 11 is provided at the output end of the first-stage screw conveying agitator 1. An induced draft fan 12 is connected to the high-temperature steam exhaust port 11. A high-temperature steam delivery pipeline 13 is connected to the output end of the induced draft fan; a high-temperature steam circulation steam inlet 15 is provided at the input end of the second-stage screw conveying agitator 2. A high-temperature steam circulation delivery branch pipe 14 is connected to the high-temperature steam delivery pipeline 13. The other end of the high-temperature steam circulation delivery branch pipe 14 is connected to the high-temperature steam circulation steam inlet 15.

[0014] A second agitator tail high-temperature steam outlet 17 is provided at the output end of the second-stage screw conveying agitator 2, a third agitator tail high-temperature steam outlet 20 is provided at the output end of the third-stage screw conveying agitator 3, a second agitator tail high-temperature steam inlet 19 and a third agitator tail high-temperature steam inlet 22 are provided at the input end of the first-stage screw conveying agitator 1, a second agitator tail high-temperature steam outlet 18 is provided between the second agitator tail high-temperature steam outlet 17 and the second agitator tail high-temperature steam inlet 19, and a third agitator tail high-temperature steam outlet 21 is provided between the third agitator tail high-temperature steam inlet 22 and the third agitator tail high-temperature steam outlet 20; a cooling air inlet 16 is provided at the input end of the third-stage screw conveying agitator 3, a cooling air inlet pipe 23 is connected to the cooling air inlet 16, and the other end of the cooling air inlet pipe 23 is connected to the exhaust pipe of the hot air furnace 34.

[0015] A working method of a cross-season heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, characterized by the following steps: When it is necessary to store electric energy as heat energy across seasons: the electromagnetic rotary kiln is turned on, and the calcium hydroxide powder in the calcium hydroxide powder supply hopper 26 is input into the electromagnetic rotary kiln, and the calcium hydroxide powder in the rotating cylinder 24 is decomposed into calcium oxide powder and hot water by the electromagnetic heating cover 25, and the decomposed calcium oxide powder is output and enters the calcium oxide powder receiving hopper 27, and the decomposed hot water is heated by the electromagnetic heating cover 25 and then drawn out by the steam induced draft fan 30 to the hot water stored in the hot water storage tank 31, thereby converting the electric energy into the calcium oxide powder and the hot water storage; When the heat energy stored in the calcium oxide powder needs to be released: the calcium oxide powder in the calcium oxide powder receiving hopper 27 is conveyed to the calcium oxide powder supply hopper 32 through the calcium oxide powder conveying and lifting system 36, the quicklime smelter and the spray water system 37 are started, the calcium oxide powder in the calcium oxide powder supply hopper 32 enters the quicklime smelter, and is successively stirred and pushed by the three groups of spiral stirring blades. The calcium oxide powder reacts chemically with water to generate calcium hydroxide and high-temperature steam, and the calcium hydroxide powder is output from the calcium hydroxide discharge port 7 to the calcium hydroxide powder receiving hopper 33. The high-temperature steam is sucked out of the first-stage spiral conveying stirrer 1 into the high-temperature steam conveying pipeline 13 by the suction force of the induced draft fan 12, and is output to the heat-using system; The calcium hydroxide powder output to the calcium hydroxide powder receiving hopper 33 is conveyed to the calcium hydroxide powder supply hopper 26 by the chain material conveyor 35, thereby realizing the circular conversion and utilization of calcium hydroxide and calcium oxide.

[0016] The following is a detailed description of the chemical heat pump based on the calcium oxide-calcium hydroxide three-stage digester in the cross-seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide: A chemical heat pump based on a three-stage digester of calcium oxide-calcium hydroxide comprises a first-stage screw conveying agitator 1, a second-stage screw conveying agitator 2, a third-stage screw conveying agitator 3 and calcium oxide powder. A calcium oxide powder inlet 4 is arranged at the input end of the first-stage screw conveying agitator 1, a second-stage agitator inlet 5 is arranged at the input end of the second-stage screw conveying agitator 2, a third-stage agitator inlet 6 is arranged at the input end of the third-stage screw conveying agitator 3, and a calcium hydroxide outlet 7 is arranged at the output end of the third-stage screw conveying agitator 3. The three screw conveying agitators are connected end to end in sequence. The invention forms a closed serpentine material conveying shell, wherein the output port of the first-stage spiral conveying agitator 1 is connected to the inlet port 5 of the second-stage agitator, and the output port of the second-stage spiral conveying agitator 2 is connected to the inlet port 6 of the third-stage agitator. The material entering from the calcium oxide powder inlet port 4 is sequentially stirred and pushed by the three groups of spiral stirring blades and then output from the calcium hydroxide outlet port 7. A first agitator water spray port 8 is provided at the input end of the first-stage spiral conveying agitator 1, a second agitator water spray port 9 is provided at the input end of the second-stage spiral conveying agitator 2, and a third agitator water spray port 10 is provided at the input end of the third-stage spiral conveying agitator. The input end of the agitator 3 is provided with a third agitator water spray port 10, and each of the three agitator water spray ports is connected to a water sprayer. The calcium oxide powder enters the first-stage screw conveying agitator 1 through the calcium oxide powder feed port 4. A high-temperature steam exhaust port 11 is provided at the output end of the first-stage screw conveying agitator 1. An induced draft fan 12 is connected to the high-temperature steam exhaust port 11. A high-temperature steam delivery pipeline 13 is connected to the output end of the induced draft fan. The high-temperature steam in the first-stage screw conveying agitator 1 is sucked out into the high-temperature steam delivery pipeline 13 by the suction force of the induced draft fan 12, so that this part of the heat is fully utilized. A high-temperature steam circulation inlet 15 is provided at the input end of the second-stage screw conveying agitator 2, and a high-temperature steam circulation delivery branch pipe 14 is connected to the high-temperature steam delivery pipeline 13. The other end of the high-temperature steam circulation delivery branch pipe 14 is connected to the high-temperature steam circulation inlet 15, and this part of the high-temperature steam is introduced into the input end of the second-stage screw conveying agitator 2 to achieve a full chemical reaction of the unreacted calcium oxide in the second-stage screw conveying agitator 2; a calcium hydroxide silo is provided below the calcium hydroxide discharge port 7, and the generated calcium hydroxide powder is collected in the calcium hydroxide silo.

[0017] A second agitator tail high-temperature steam outlet 17 is provided at the output end of the second-stage screw conveying agitator 2, a third agitator tail high-temperature steam outlet 20 is provided at the output end of the third-stage screw conveying agitator 3, a second agitator tail high-temperature steam inlet 19 and a third agitator tail high-temperature steam inlet 22 are provided at the input end of the first-stage screw conveying agitator 1, respectively, a second agitator tail high-temperature steam outlet 18 is provided between the second agitator tail high-temperature steam outlet 17 and the second agitator tail high-temperature steam inlet 19, a third agitator tail high-temperature steam outlet 21 is provided between the third agitator tail high-temperature steam inlet 22 and the third agitator tail high-temperature steam outlet 20, the second agitator tail high-temperature steam is introduced into the input end of the first-stage screw conveying agitator 1, and the water in the input end of the first-stage screw conveying agitator 1 is heated. Heat is generated to generate high-temperature steam. After the generated high-temperature steam is output from the high-temperature steam exhaust port 11 and enters the high-temperature steam conveying pipeline 13, a part of it is led back to the input end of the second-stage spiral conveying agitator 2, and then heated by the heat of the chemical reaction in the second-stage spiral conveying agitator 2, and then introduced into the input end of the first-stage spiral conveying agitator 1 through the high-temperature steam lead-out pipe 18 at the tail of the second agitator, and the cycle is repeated, so that the heat of the chemical reaction in the three-stage digester is fully absorbed into the high-temperature steam, and the heat energy released by the chemical reaction of converting calcium oxide into calcium hydroxide is stored in the high-temperature steam and fully utilized after being led out; a cooling air inlet 16 is provided at the input end of the third-stage spiral conveying agitator 3, and a cooling air inlet pipe 23 is connected to the cooling air inlet 16, and the other end of the cooling air inlet pipe 23 is connected to the exhaust pipe of the hot blast furnace to reduce the temperature of the output calcium hydroxide powder.

[0018] The working method of the chemical heat pump based on the three-stage digester of calcium oxide-calcium hydroxide in the cross-season heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide is described in detail below: A working method of a chemical heat pump of a three-stage digester based on calcium oxide-calcium hydroxide, wherein a first-stage screw conveying agitator 1, a second-stage screw conveying agitator 2 and a third-stage screw conveying agitator 3 are started simultaneously, characterized by the following steps: The first step is to add calcium oxide powder to the input end of the first-stage screw conveyor stirrer 1 through the calcium oxide powder feed port 4, open the first water sprayer connected to the first stirrer water spray port 8, spray water onto the calcium oxide powder entering the input end of the first-stage screw conveyor stirrer 1, and chemically react the water and the calcium oxide powder to generate calcium hydroxide, and heat the water that does not participate in the chemical reaction; Step 2: The first-stage mixture of unreacted calcium oxide powder, heated water and generated calcium hydroxide is transported to the output end of the first-stage screw conveying stirrer 1 as the spiral stirring blades in the first-stage screw conveying stirrer 1 rotate. During this process, a portion of the unreacted calcium oxide powder continues to chemically react with the heated water, continues to release heat, and heats the water into steam. The generated steam passes through the high-temperature steam exhaust port 11 and is sucked into the high-temperature steam conveying pipeline 13 by the induced draft fan; Step 3: The first-stage mixture transported to the output end of the first-stage screw conveying stirrer 1 enters the input end of the second-stage screw conveying stirrer 2 through the second-stage stirrer feed port 5, and the second water sprayer connected to the second stirrer water spray port 9 is started 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 delivery pipeline 13 enters the input end of the second-stage screw conveying stirrer 2 through the high-temperature steam circulation delivery branch pipe 14 and the high-temperature steam circulation steam inlet 15 to heat the first-stage mixture. Step 4: The first-stage mixture in the input end of the second-stage screw conveying stirrer 2 is transported to the output end of the second-stage screw conveying stirrer 2 as the spiral stirring blades in the second-stage screw conveying stirrer 2 rotate. During this process, a portion of the 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 steam inlet 15 to continue to generate calcium hydroxide and continue to release heat to heat the steam in the second-stage screw conveying stirrer 2. Step 5: The second-stage mixture transported to the output end of the second-stage screw conveying agitator 2 enters the input end of the third-stage screw conveying agitator 3 through the third-stage agitator inlet 6, and the heated steam enters the input end of the first-stage screw conveying agitator 1 through the high-temperature steam outlet 17 at the tail of the second agitator, the high-temperature steam outlet pipe 18 at the tail of the second agitator, and the high-temperature steam inlet 19 at the tail of the second agitator in turn; Step 6. The second-stage mixture conveyed to the output end of the second-stage spiral conveying agitator 2 enters the input end of the third-stage spiral conveying agitator 3 through the third-stage agitator inlet 6, and is conveyed to the output end of the third-stage spiral conveying agitator 3 as the spiral stirring blades in the third-stage spiral conveying agitator 3 rotate, and is output from the calcium hydroxide outlet 7 to the calcium hydroxide silo. At the same time, the cooling air from the hot blast furnace exhaust duct enters the first-stage spiral conveying agitator 1 through the cooling air inlet pipe 23 and the cooling air inlet 16 in turn to cool the generated calcium hydroxide.

[0019] Start the third water sprayer connected to the water spray port 10 of the third agitator to spray water to the second-stage mixture entering the input end of the third-stage screw conveyor agitator 3; connect the high-temperature steam outlet pipe 21 at the tail of the third agitator to introduce the steam at the output end of the third-stage screw conveyor agitator 3 into the input end of the first-stage screw conveyor agitator 1; the above two measures can be used as a supplementary measure for the entire reaction process; control whether the third-stage digester sprays water and the amount of water sprayed according to the digestion situation of the material discharged from the discharge port of the third-stage digester.

Claims

1. A seasonal heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide, comprising an electromagnetic rotary kiln, a quicklime smelter, calcium oxide powder and calcium hydroxide powder; the electromagnetic kiln is composed of a rotating cylinder (24) and an electromagnetic heating cover (25); the quicklime smelter is composed of a first-stage screw conveying stirrer (1), a second-stage screw conveying stirrer (2) and a third-stage screw conveying stirrer (3) connected end to end in sequence, characterized in that: A calcium hydroxide powder supply hopper (26) is provided at the feeding end of the electromagnetic rotary kiln, a calcium oxide powder receiving hopper (27) is provided at the discharging end of the electromagnetic rotary kiln, a calcium oxide powder supply hopper (32) is provided at the feeding end of the quicklime digester, a calcium hydroxide powder receiving hopper (33) is provided at the discharging end of the quicklime digester, a chain material conveyor (35) is provided between the calcium hydroxide powder supply 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 supply hopper (32); a calcium oxide powder receiving hopper (32) is provided at the discharging end of the electromagnetic rotary kiln. A water vapor outlet (28) is provided, a water vapor outlet pipe (29) is connected to the water vapor outlet (28), the other end of the water vapor outlet pipe (29) is arranged in the hot water stored in the hot water storage tank (31), and a water vapor induced draft fan (30) is arranged on the water vapor outlet pipe (29); a spray water system (37) is arranged in the quicklime smelter, a high-temperature steam exhaust port (11) is provided on the quicklime smelter, an induced draft fan (12) is connected to the high-temperature steam exhaust port (11), and a high-temperature steam delivery pipeline (13) is connected to the output end of the induced draft fan, and the high-temperature steam delivery pipeline (13) is output to the heat-using system after passing through the hot air furnace (34).

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

3. A cross-season heat storage and release system based on cyclic conversion of calcium hydroxide and calcium oxide according to claim 2, characterized in that: A second agitator tail high-temperature steam outlet (17) is provided at the output end of the second-stage screw conveying agitator (2), a third agitator tail high-temperature steam outlet (20) is provided at the output end of the third-stage screw conveying agitator (3), a second agitator tail high-temperature steam introduction port (19) and a third agitator tail high-temperature steam introduction port (22) are provided at the input end of the first-stage screw conveying agitator (1), and a second agitator tail high-temperature steam introduction port (19) and a third agitator tail high-temperature steam introduction port (22) are provided at the second agitator tail high-temperature steam outlet (17) and the second agitator tail high-temperature steam introduction port ( A second agitator tail high-temperature steam outlet pipe (18) is provided between the second agitator tail and the third agitator tail high-temperature steam outlet (20), and a third agitator tail high-temperature steam outlet pipe (21) is provided between the third agitator tail high-temperature steam inlet (22) and the third agitator tail high-temperature steam outlet (20); 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), and the other end of the cooling air inlet pipe (23) is connected to the exhaust pipe of the hot air furnace (34).

4. A working method of a cross-season heat storage and release system based on the cyclic conversion of calcium hydroxide and calcium oxide as claimed in claim 3, characterized by the following steps: When it is necessary to store electric energy as heat energy across seasons: the electromagnetic rotary kiln is turned on, and the calcium hydroxide powder in the calcium hydroxide powder supply hopper (26) is input into the electromagnetic rotary kiln, and the calcium hydroxide powder in the rotating cylinder (24) is decomposed into calcium oxide powder and hot water by the electromagnetic heating cover (25), and the decomposed calcium oxide powder is output and then enters the calcium oxide powder receiving hopper (27), and the decomposed hot water is heated by the electromagnetic heating cover (25) and then drawn out by the steam induced draft fan (30) into the hot water stored in the hot water storage tank (31), thereby converting the electric energy into the calcium oxide powder and the hot water; When the heat energy stored in the calcium oxide powder needs to be released: the calcium oxide powder in the calcium oxide powder receiving hopper (27) is conveyed to the calcium oxide powder supply hopper (32) through the calcium oxide powder conveying and lifting system (36), the quicklime smelter and the spray water system (37) are started, the calcium oxide powder in the calcium oxide powder supply hopper (32) enters the quicklime smelter, and is successively stirred and pushed by the three groups of spiral stirring blades. When the calcium oxide powder meets water, a chemical reaction occurs to generate calcium hydroxide and high-temperature steam. The calcium hydroxide powder is output from the calcium hydroxide discharge port (7) to the calcium hydroxide powder receiving hopper (33). The high-temperature steam is sucked out of the first-stage spiral conveying stirrer (1) into the high-temperature steam conveying pipeline (13) by the suction force of the induced draft fan (12), and is output to the heat-using system; The calcium hydroxide powder output to the calcium hydroxide powder receiving hopper (33) is conveyed to the calcium hydroxide powder supply hopper (26) by the chain material conveyor (35), thereby realizing the circular conversion and utilization of calcium hydroxide and calcium oxide.

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