A waste heat utilization device for the preparation of calcium oxide

Abstract

This utility model relates to a waste heat recovery device for the preparation of calcium oxide, comprising a reaction vessel and a stirring element connected to a lid at the upper end of the reaction vessel. The stirring element includes a stirring rod and a stirring column connected to the stirring rod. A heat-conducting pipe is connected to the stirring rod, and a first heat recovery tank and a second heat recovery tank are connected to the heat-conducting pipe. The technical solution of this application offers the following advantages: by cleverly connecting the heat-conducting pipe to the stirring rod of the stirring element and equipping it with a first heat recovery tank and a second heat recovery tank, the waste heat generated during the preparation of calcium oxide can be recovered comprehensively and efficiently. During the reaction, the reactants in the reaction vessel are fully mixed and reacted under the action of the stirring element, releasing a large amount of heat. The heat-conducting pipe can quickly transfer the heat in the reaction vessel to the first and second heat recovery tanks. The heat-storing liquid stored in the tanks absorbs and stores the heat, achieving effective recovery of waste heat.

Description

Technical Field

[0001] This utility model relates to the field of calcium oxide preparation, specifically to a waste heat utilization device for the calcium oxide preparation reaction. Background Technology

[0002] Calcium oxide, as an important inorganic chemical raw material, is widely used in construction, metallurgy, chemical industry, environmental protection and other fields, and its market demand continues to grow with the development of the industrial economy. Currently, the mainstream industrial process for producing calcium oxide is the high-temperature calcination method of calcium carbonate, which involves heating calcium carbonate at high temperatures to decompose it into calcium oxide and carbon dioxide.

[0003] The decomposition reaction of calcium carbonate requires a continuously maintained high-temperature environment. Conventional production often uses coal, gas, or electric heating to provide heat, resulting in high energy consumption. The reaction system itself accumulates a large amount of heat, which is mostly dissipated naturally as the equipment cools after the reaction. On the other hand, the carbon dioxide gas generated in the reaction carries a large amount of high-temperature heat. Traditional processes simply collect or directly release this heat, resulting in the ineffective utilization of this heat. This not only wastes energy but may also create an additional environmental heat dissipation burden due to the emission of high-temperature gases.

[0004] Therefore, it is very necessary to provide a waste heat utilization device for the calcium oxide preparation reaction to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on the above description, this utility model provides a waste heat utilization device for the preparation of calcium oxide reaction, which solves the problem that the existing technology simply collects or directly discharges excess heat, resulting in the ineffective utilization of this heat, which not only causes energy waste, but may also bring additional environmental heat dissipation burden due to the emission of high-temperature gas.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A waste heat utilization device for the preparation of calcium oxide reaction includes a reaction tank and a stirring element connected to the upper end of the reaction tank and inside the tank cover. The stirring element is used to stir the reactants in the reaction tank. The stirring element includes a stirring rod and a stirring column connected to the stirring rod. A heat-conducting pipe is connected to the stirring rod. A first heat recovery tank and a second heat recovery tank are connected to the heat-conducting pipe. The first heat recovery tank and the second heat recovery tank are used to store heat storage liquid to recover and store the recovered heat.

[0007] Furthermore, a rotating drum is connected inside the reaction vessel, and the stirring component includes a rotating main shaft rotatably connected to the rotating drum, with the rotating main shaft passing through the vessel cover, and the stirring connecting rod connected to the rotating main shaft.

[0008] Furthermore, the stirring component includes a stirring motor connected to the bucket lid and a main shaft gear connected to the rotating main shaft. The stirring motor is connected to a stirring gear, and the stirring gear is geared to the main shaft gear.

[0009] Furthermore, the stirring rod is provided with a connecting rod cavity, the upper end of the rotating main shaft is provided with a main shaft cavity, the connecting rod cavity is connected to the main shaft cavity, and the heat-conducting pipe is connected to the main shaft cavity.

[0010] Furthermore, a heat-conducting column is connected inside the stirring column. The heat-conducting column is made of graphene or diamond and is located inside the connecting rod cavity.

[0011] Furthermore, both the first heat recovery tank and the second heat recovery tank are connected to a heat-conducting column. The heat-conducting column has a column cavity, which is connected to the heat-conducting pipe. The connecting rod cavity, the main shaft cavity, the heat-conducting pipe, and the column cavity are used to contain a heat-conducting liquid, which is one of diarylalkane heat-conducting oil, perfluoropolyether, or mineral oil-based heat-conducting oil.

[0012] Furthermore, both the first heat recovery tank and the second heat recovery tank are connected to an auxiliary box at their upper ends. The heat-conducting pipe and the heat-conducting column are connected through the auxiliary box, and a temperature sensor is connected to the auxiliary box.

[0013] Furthermore, the lid of the container is connected to an air outlet, and the air outlet is connected to a heat recovery component. The heat recovery component is located on the outside of the first heat recovery tank and the second heat recovery tank, and is used to keep the first heat recovery tank and the second heat recovery tank warm.

[0014] Furthermore, the heat recovery component includes an insulated tank fitted around the outside of the first heat recovery tank and the second heat recovery tank.

[0015] Furthermore, the lid of the container is connected to an air outlet connector, and the heat recovery component includes an air outlet pipe connected to the air outlet connector. The air outlet pipe is annularly sleeved on the first heat recovery tank and the second heat recovery tank, and the air outlet pipe is located between the heat preservation tank and the first heat recovery tank or the second heat recovery tank.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: By cleverly connecting heat-conducting pipes to the stirring rod of the agitator and equipping it with a first heat recovery tank and a second heat recovery tank, the waste heat generated during the calcium oxide preparation reaction can be comprehensively and efficiently recovered. During the reaction, the reactants in the reaction vessel are thoroughly mixed and reacted under the action of the agitator, releasing a large amount of heat. The heat-conducting pipes can quickly transfer the heat from the reaction vessel to the first and second heat recovery tanks. The heat storage liquid stored in the tanks absorbs and stores the heat, achieving effective recovery of waste heat, avoiding heat waste, improving overall energy utilization efficiency, and reducing energy consumption costs. This solves the problem of existing technologies simply collecting or directly releasing excess heat, resulting in the ineffective utilization of this heat, causing energy waste, and potentially creating additional environmental heat dissipation burden due to high-temperature gas emissions. Attached Figure Description

[0017] Figure 1 One of the overall structural schematic diagrams of a waste heat utilization device for the preparation of calcium oxide provided in this embodiment of the present invention; Figure 2 A second schematic diagram of the overall structure of a waste heat utilization device for the preparation of calcium oxide provided in this embodiment of the present invention; Figure 3 This is a partial cross-sectional structural schematic diagram of a waste heat utilization device for the preparation of calcium oxide provided in an embodiment of the present invention; Figure 4 A top view schematic diagram of a waste heat utilization device for the preparation of calcium oxide provided in this embodiment of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at point AA; Figure 6 for Figure 5 A magnified structural diagram of point Q.

[0018] The attached diagram lists the components represented by each number as follows: 1. Reaction tank body; 11. Bucket lid; 111. Air outlet; 12. Rotating drum; 2. Agitator components; 21. Stirring rod; 211. Connecting rod cavity; 22. Stirring column; 221. Heat-conducting column; 23. Rotate the spindle; 231. Spindle cavity; 24. Agitator motor; 25. Agitator gear; 26. Main shaft gear; 3. Heat pipe; 4. First heat recovery tank; 5. Second heat recovery tank; 51. Heat-conducting column; 511. Column cavity; 6. Auxiliary box; 61. Temperature sensor; 7. Heat recovery unit; 71. Insulation tank; 72. Gas outlet connector; 73. Gas outlet pipe. Detailed Implementation

[0019] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0021] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0022] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0023] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0024] like Figures 1 to 6 As shown, a waste heat utilization device for the preparation of calcium oxide includes a reaction tank 1 and a stirring element 2 connected to a tank cover 11 at the upper end of the reaction tank 1. The stirring element 2 is used to stir the reactants in the reaction tank 1. The stirring element 2 includes a stirring rod 21 and a stirring column 22 connected to the stirring rod 21. A heat-conducting pipe 3 is connected to the stirring rod 21. A first heat recovery tank 4 and a second heat recovery tank 5 are connected to the heat-conducting pipe 3. The first heat recovery tank 4 and the second heat recovery tank 5 are used to store heat storage liquid to recover and store the recovered heat.

[0025] In this embodiment, by installing a heat-conducting pipe 3 on the stirring rod 21, a large amount of waste heat generated by the calcium carbonate decomposition reaction inside the reaction vessel 1 can be directly contacted and absorbed. This waste heat is then stored in a heat storage liquid via the first heat recovery tank 4 and the second heat recovery tank 5, effectively capturing and recovering the high-temperature reaction waste heat and improving energy utilization. While the stirring element 2 stirs the reactants, the heat-conducting pipe 3 can evenly transfer some heat to the interior of the reaction vessel 1, making the temperature distribution inside the reaction vessel 1 more uniform, avoiding excessively high or low temperatures in certain areas, promoting a more complete and stable calcium carbonate decomposition reaction, and improving the efficiency and quality of calcium oxide formation. During the stirring process, the stirring column 22 ensures full contact between the reactants and the heat-conducting pipe 3, improving heat exchange efficiency. Simultaneously, the heat transfer from the heat-conducting pipe 3 helps maintain the required reaction temperature, forming a virtuous cycle.

[0026] In some embodiments, a rotating drum 12 is connected inside the reaction vessel 1, and the stirring component 2 includes a rotating main shaft 23 rotatably connected to the rotating drum 12, and the rotating main shaft 23 passes through the barrel cover 11, and the stirring connecting rod 21 is connected to the rotating main shaft 23.

[0027] In some embodiments, the stirring component 2 includes a stirring motor 24 connected to the bucket cover 11 and a main shaft gear 26 connected to the rotating main shaft 23. A stirring gear 25 is connected to the stirring motor 24, and the stirring gear 25 is geared to the main shaft gear 26.

[0028] In this embodiment, the stirring motor 24 drives the stirring gear 25, which in turn drives the main shaft gear 26 and the rotating main shaft 23 to rotate. This causes the stirring connecting rod 21 and the stirring column 22 to rotate stably in the rotating drum 12 inside the reaction tank 1, which enhances the mechanical stirring effect on the reactants, avoids material deposition or local agglomeration, and allows the calcium carbonate particles to come into more full contact with heat, thereby improving the uniformity and thoroughness of the decomposition reaction.

[0029] In some embodiments, the stirring rod 21 has a connecting rod cavity 211, the upper end of the rotating main shaft 23 has a main shaft cavity 231, the connecting rod cavity 211 is connected to the main shaft cavity 231, and the heat pipe 3 is connected to the main shaft cavity 231.

[0030] In some embodiments, a heat-conducting column 221 is connected inside the stirring column 22. The heat-conducting column 221 is made of graphene or diamond and is located inside the connecting rod cavity 211.

[0031] In some embodiments, both the first heat recovery tank 4 and the second heat recovery tank 5 are connected to a heat-conducting column 51. The heat-conducting column 51 is provided with a column cavity 511, which is connected to the heat-conducting pipe 3. The connecting rod cavity 211, the main shaft cavity 231, the heat-conducting pipe 3 and the column cavity 511 are used to contain a heat-conducting liquid, which is one of diarylalkane heat-conducting oil, perfluoropolyether or mineral oil-based heat-conducting oil.

[0032] In this embodiment, the connection between the connecting rod cavity 211 and the main shaft cavity 231, along with the connection between the heat-conducting pipe 3 and the column cavity 511, forms a closed heat-conducting channel that runs through the stirring component 2 and the heat recovery tanks 4 and 5. The heat-conducting liquid circulates within this channel, efficiently transferring the waste heat in the reaction vessel 1 to the first heat recovery tank 4 and the second heat recovery tank 5, significantly improving the continuity and stability of heat recovery.

[0033] In some embodiments, the upper ends of the first heat recovery tank 4 and the second heat recovery tank 5 are both connected to an auxiliary box 6, the heat conduction pipe 3 and the heat conduction column 221 are connected through the auxiliary box 6, and a temperature sensor 61 is connected to the auxiliary box 6.

[0034] In this embodiment, the temperature sensor 61 on the auxiliary box 6 can monitor the temperature changes in the heat conduction system in real time and provide timely feedback on the temperature status of the heat conduction liquid. This data allows for accurate determination of the reaction process within the reaction vessel 1, such as whether the calcium carbonate decomposition has reached the expected temperature and the waste heat recovery efficiency, providing a basis for controlling the speed of the stirring motor 24 and adjusting the heat distribution.

[0035] In some embodiments, the lid 11 is connected to an air outlet 111, and the air outlet 111 is connected to a heat recovery component 7. The heat recovery component 7 is located on the outside of the first heat recovery tank 4 and the second heat recovery tank 5, and is used to keep the first heat recovery tank 4 and the second heat recovery tank 5 warm.

[0036] In some embodiments, the heat recovery component 7 includes an insulated tank 71 that is sleeved on the outside of the first heat recovery tank 4 and the second heat recovery tank 5.

[0037] In some embodiments, the lid 11 is connected to an air outlet connector 72, and the heat recovery component 7 includes an air outlet pipe 73 connected to the air outlet connector 72. The air outlet pipe 73 is annularly sleeved on the first heat recovery tank 4 and the second heat recovery tank 5, and the air outlet pipe 73 is located between the heat preservation tank 71 and the first heat recovery tank 4 or the second heat recovery tank 5.

[0038] In this embodiment, the high-temperature carbon dioxide gas generated by the decomposition of calcium carbonate inside the reaction vessel 1 is discharged through the outlet 111 and transported to the outside of the first heat recovery tank 4 and the second heat recovery tank 5 via the outlet connector 72 and the outlet pipe 73. The residual heat carried by this high-temperature exhaust gas is used to heat or insulate the recovery tanks. Furthermore, the outlet pipe 73 is arranged in a ring-like spiral on the first heat recovery tank 4 and the second heat recovery tank 5, thereby increasing the insulation effect.

[0039] Example 2: The reaction vessel 1 is made of high-temperature resistant stainless steel, and its inner diameter is designed according to the scale of calcium oxide preparation to ensure that it can withstand the high temperature during the reaction process. A support base is provided at the bottom of the vessel to fix the whole device. The rotating cylinder 12 is welded or bolted to the center of the inside of the vessel. The rotating cylinder 12 is a cylindrical hollow structure with an inner diameter that matches the rotating main shaft 23 to limit the rotation trajectory of the rotating main shaft 23 and prevent it from deviating during stirring. The barrel cover 11 is connected to the upper end of the reaction vessel 1 via a flange. A high-temperature resistant sealing gasket, such as a graphite gasket, is installed between the flanges to prevent hot gas leakage during the reaction. A circular through hole is opened in the center of the barrel cover 11, with a diameter slightly larger than that of the rotating main shaft 23, for the rotating main shaft 23 to pass through.

[0040] The gas outlet 111 is welded to the edge of the barrel cover 11. It is a cylindrical interface with one end connected to the inside of the reaction barrel 1 and the other end connected to the heat recovery component 7 through a pipe to export the high-temperature hot gas generated by the reaction. The gas outlet connector 72 is bolted to the outside of the gas outlet 111. It is a threaded tee interface with one end connected to the gas outlet 111, one end connected to the gas outlet pipe 73, and the other end reserved as a spare interface for connecting a pressure gauge to monitor the gas pressure.

[0041] The stirring element 2 is the power core of the device, used to stir the calcium carbonate inside the reaction tank 1. The rotating main shaft 23 is made of solid high-temperature resistant alloy and its length exceeds the height of the reaction tank 1. A main shaft cavity 231 is opened at the upper end of the rotating main shaft 23. The main shaft cavity 231 is an axially hollow hole that communicates with the connecting rod cavity 211 to contain the heat-conducting liquid. The stirring motor 24 is fixed to the tank cover 11 by motor bracket bolts and is located on one side of the rotating main shaft 23. A high-temperature resistant geared motor is selected. The stirring gear 25 is fixed to the output shaft of the stirring motor 24 by a key. The main shaft gear 26 is fixed to the upper end of the rotating main shaft 23 by a key, and the part that extends out of the tank cover 11 meshes with the stirring gear 25 to realize the transmission of power from the stirring motor 24 to the rotating main shaft 23. The stirring rod 21 is a solid rod made of the same material as the rotating main shaft 23, evenly distributed along the axial direction of the rotating main shaft 23, and fixed to the lower end of the rotating main shaft 23 by welding or threaded connection. A connecting rod cavity 211 is formed inside the stirring rod 21. The connecting rod cavity 211 is an axially hollow hole that runs through the entire stirring rod 21 and communicates with the main shaft cavity 231, forming a flow channel for the heat-conducting liquid. The stirring column 22 is vertically welded below the stirring rod 21 and is a cylindrical solid structure used to enhance the stirring force of the raw materials. A heat-conducting column 221 is embedded inside the stirring column 22. The heat-conducting column 221 is made of graphene or diamond material, with its upper end extending into the connecting rod cavity 211 and its lower end flush with the bottom of the stirring column 22. It is used to quickly absorb the heat of the raw materials during the stirring process and transfer it to the heat-conducting liquid in the connecting rod cavity 211. The heat-conducting pipe 3 is made of high-temperature resistant stainless steel, with a diameter matching the main shaft cavity 231. One end is connected to the main shaft cavity 231 of the rotating main shaft 23 by welding or threaded connection, and the other end is split into two paths, connecting to the heat-conducting columns 51 of the first heat recovery tank 4 and the second heat recovery tank 5 respectively. The pipe is wrapped with insulation cotton, such as aluminum silicate cotton, to reduce heat loss during transmission. The pipe is fixed to the device support with pipe clamps in the middle to prevent shaking from causing the joints to loosen.

[0042] Both the first heat recovery tank 4 and the second heat recovery tank 5 are cylindrical sealed tanks made of the same material as the reaction vessel 1. Each tank has supporting legs at the bottom and an inspection port with a sealing cap at the top. A vertically welded heat-conducting column 51 is located inside the tank. The heat-conducting column 51 has a hollow structure with an internal column cavity 511. One end of the column cavity 511 is connected to the heat-conducting pipe 3, and the other end extends to the bottom of the tank for introducing and storing the heat-conducting liquid. The connecting rod cavity 211, the main shaft cavity 231, the heat-conducting pipe 3, and the column cavity 511 are filled with a heat-conducting liquid, selected from diarylalkane heat-conducting oil, perfluoropolyether, or mineral oil-based heat-conducting oil, to ensure stable heat transfer at the calcium oxide reaction temperature.

[0043] The auxiliary box 6 is made of plastic or metal and is bolted to the upper end of the first heat recovery tank 4 and the second heat recovery tank 5, near the interface of the heat-conducting pipe 3. An internal pipe joint is provided for connecting the heat-conducting pipe 3 and the heat-conducting column 221. A portion of the heat-conducting liquid can flow bidirectionally through the auxiliary box 6, while also acting as a pressure buffer. The temperature sensor 61 is a platinum resistance sensor, model PT100, installed on the side of the auxiliary box 6 via a threaded interface. The probe extends into the auxiliary box 6, contacting the heat-conducting liquid, to monitor the temperature of the liquid in real time and transmit the data to an external control system, such as a PLC, for adjusting the waste heat recovery efficiency.

[0044] The heat recovery unit 7 is used to utilize the high-temperature hot gas discharged from the reaction vessel 1 to insulate the first heat recovery tank 4 and the second heat recovery tank 5, thereby reducing the heat loss of the stored liquid. Specifically, it includes an insulation tank 71 and an exhaust pipe 73. The insulation tank 71 is made of double-layer stainless steel with insulation cotton filling the middle. It is cylindrical in shape, with a diameter larger than that of the first heat recovery tank 4 and the second heat recovery tank 5, and a height consistent with the two recovery tanks. The insulation tank 71 is fitted on the outside of the two recovery tanks, fixed at the bottom by a bracket, and has an opening at the top for the heat conduction pipe 3 and the auxiliary box 6 to pass through, forming a sealed insulation space. The vent pipe 73 is made of high-temperature resistant stainless steel. One end is connected to the vent connector 72 by a thread, and the other end is wound in a ring along the inner wall of the insulation tank 71, eventually extending to the outside of the insulation tank 71. It can be connected to waste heat recovery equipment, such as a heat exchanger. The vent pipe 73 is located between the insulation tank 71 and the two recovery tanks. The pipe body has small air holes to evenly release the high-temperature hot gas discharged from the reaction vessel 1 into the insulation space to heat and keep the recovery tanks warm.

[0045] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: By cleverly connecting heat-conducting pipes to the stirring rod of the agitator and equipping it with a first heat recovery tank and a second heat recovery tank, the waste heat generated during the calcium oxide preparation reaction can be comprehensively and efficiently recovered. During the reaction, the reactants in the reaction vessel are thoroughly mixed and reacted under the action of the agitator, releasing a large amount of heat. The heat-conducting pipes can quickly transfer the heat from the reaction vessel to the first and second heat recovery tanks. The heat storage liquid stored in the tanks absorbs and stores the heat, achieving effective recovery of waste heat, avoiding heat waste, improving overall energy utilization efficiency, and reducing energy consumption costs. This solves the problem of existing technologies simply collecting or directly releasing excess heat, resulting in the ineffective utilization of this heat, causing energy waste, and potentially creating additional environmental heat dissipation burden due to high-temperature gas emissions.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste heat utilization device for the preparation of calcium oxide, characterized in that, The reaction vessel includes a reaction vessel body (1) and a stirring element (2) connected to a lid (11) at the upper end of the reaction vessel body (1). The stirring element (2) is used to stir the reactants in the reaction vessel body (1). The stirring element (2) includes a stirring rod (21) and a stirring column (22) connected to the stirring rod (21). A heat-conducting pipe (3) is connected to the stirring rod (21). A first heat recovery tank (4) and a second heat recovery tank (5) are connected to the heat-conducting pipe (3). The first heat recovery tank (4) and the second heat recovery tank (5) are used to store heat storage liquid to recover and store the recovered heat.

2. The waste heat utilization device for the preparation of calcium oxide reaction according to claim 1, characterized in that, The reaction tank (1) is connected to a rotating drum (12), and the stirring component (2) includes a rotating main shaft (23) rotatably connected to the rotating drum (12), and the rotating main shaft (23) passes through the tank cover (11). The stirring rod (21) is connected to the rotating main shaft (23).

3. The waste heat utilization device for the calcium oxide preparation reaction according to claim 2, characterized in that, The stirring component (2) includes a stirring motor (24) connected to the bucket cover (11) and a main shaft gear (26) connected to the rotating main shaft (23). A stirring gear (25) is connected to the stirring motor (24), and the stirring gear (25) is gear-connected to the main shaft gear (26).

4. The waste heat utilization device for the preparation of calcium oxide reaction according to claim 3, characterized in that, The stirring rod (21) has a connecting rod cavity (211), the upper end of the rotating main shaft (23) has a main shaft cavity (231), the connecting rod cavity (211) is connected to the main shaft cavity (231), and the heat pipe (3) is connected to the main shaft cavity (231).

5. The waste heat utilization device for the calcium oxide preparation reaction according to claim 4, characterized in that, The stirring column (22) is connected to a heat-conducting column (221), which is made of graphene or diamond and is located inside the connecting rod cavity (211).

6. The waste heat utilization device for the calcium oxide preparation reaction according to claim 5, characterized in that, Both the first heat recovery tank (4) and the second heat recovery tank (5) are connected to a heat-conducting column (51). The heat-conducting column (51) is provided with a column cavity (511). The column cavity (511) is connected to the heat-conducting pipe (3). The connecting rod cavity (211), the main shaft cavity (231), the heat-conducting pipe (3) and the column cavity (511) are used to contain heat-conducting liquid. The heat-conducting liquid is one of diaryl alkane heat-conducting oil, perfluoropolyether or mineral oil type heat-conducting oil.

7. The waste heat utilization device for the preparation of calcium oxide reaction according to claim 6, characterized in that, The upper ends of the first heat recovery tank (4) and the second heat recovery tank (5) are both connected to an auxiliary box (6). The heat-conducting pipe (3) and the heat-conducting column (221) are connected through the auxiliary box (6), and a temperature sensor (61) is connected to the auxiliary box (6).

8. The waste heat utilization device for the preparation of calcium oxide reaction according to claim 1, characterized in that, The lid (11) is connected to an air outlet (111), and the air outlet (111) is connected to a heat recovery component (7). The heat recovery component (7) is located on the outside of the first heat recovery tank (4) and the second heat recovery tank (5) and is used to keep the first heat recovery tank (4) and the second heat recovery tank (5) warm.

9. The waste heat utilization device for the preparation of calcium oxide reaction according to claim 8, characterized in that, The heat recovery unit (7) includes an insulated tank (71) fitted outside the first heat recovery tank (4) and the second heat recovery tank (5).

10. The waste heat utilization device for the preparation of calcium oxide reaction according to claim 9, characterized in that, The lid (11) is connected to an air outlet connector (72). The heat recovery component (7) includes an air outlet pipe (73) connected to the air outlet connector (72). The air outlet pipe (73) is annularly sleeved on the first heat recovery tank (4) and the second heat recovery tank (5). The air outlet pipe (73) is located between the heat preservation tank (71) and the first heat recovery tank (4) or the second heat recovery tank (5).

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