Heat storage and utilization equipment for gas waste heat

Abstract

The utility model relates to heat storage and utilization equipment for gas waste heat, which comprises a first storage tank, a second storage tank, a rotary kiln type heat exchanger, a mixing reactor, a water supply device and a heat utilization heat exchanger, a heat exchange reaction space is formed in the kiln barrel, a feeding port and a gas inlet are formed in one end of the rotary kiln type heat exchanger in the axial direction of the kiln barrel, a discharging port and a gas outlet are formed in the other side of the rotary kiln type heat exchanger, the first storage tank stores hydrated salt after water absorption reaction and is connected with the feeding port of the rotary kiln type heat exchanger, the kiln barrel is obliquely arranged, and the second storage tank is connected with the discharging port of the rotary kiln type heat exchanger. The side where the feeding port is located is higher than the side where the discharging port is located, the discharging port is connected with the second storage tank, the second storage tank is connected with the mixing reactor, the water supply device is connected with the mixing reactor, the mixing reactor is connected with the heat utilization heat exchanger, and the heat utilization heat exchanger is connected with the first storage tank.

Description

Technical Field

[0001] This utility model relates to the field of thermal energy storage technology, specifically to a thermal energy storage and utilization device for waste heat from gases. Background Technology

[0002] Combined cycle gas turbine (CCG) systems offer advantages such as high thermal efficiency, low cost, low pollution, small footprint, and flexible operation, attracting global attention and implementation. The waste heat boiler is one of the three main components of a CCG power plant, acting as a bridge between the gas turbine and steam turbine. Its flue gas temperature is approximately 70-100℃. Generally, flue gas losses can account for 3%-8% of the overall heat loss of the waste heat boiler, representing a major factor affecting its thermal efficiency. Unlike power plant boilers, the flue gas temperature of the waste heat boiler in a CCG system is significantly affected by ambient temperature, with a difference of nearly 30-40℃ between winter and summer. Therefore, seasonal variations not only cause fluctuations in the performance of heavy-duty gas turbines but also significantly impact the potential for waste heat recovery from the waste heat boiler flue gas.

[0003] The ability to utilize low-grade waste heat on-site is a prerequisite for its recovery and utilization. Therefore, waste heat from power plant boiler flue gas is often used to heat boiler feedwater or preheat air. However, the flue gas temperature of waste heat boilers is low in winter (approximately 70°C), making waste heat recovery unprofitable. While the flue gas temperature is higher in summer (approximately 100°C), allowing for the recovery of significant amounts of waste heat, the temperature difference between the waste heat and the summer boiler feedwater or air is small, resulting in low heat exchange efficiency and making it difficult to utilize the recovered waste heat on-site. If the waste heat from high-temperature flue gas in summer could be recovered and stored for winter, it could be used to heat boiler feedwater or provide heating for the plant area, thus solving the problem of the mismatch between supply and demand for waste heat from flue gas.

[0004] Thermal energy storage is a common method to address the mismatch between waste heat recovery and utilization processes. Common methods include phase change thermal energy storage (such as paraffin wax) and thermochemical thermal energy storage (such as hydrated salts). Phase change thermal energy storage is based on the release and absorption of the latent heat of phase change in materials to store heat. While it features high thermal density and small temperature variations, it can only alleviate the energy supply-demand mismatch between day and night (such as in solar thermal utilization systems) and cannot achieve cross-seasonal thermal energy storage. In contrast, thermochemical thermal energy storage utilizes reversible reactions to convert high-temperature thermal energy into chemical energy and store it in a reaction medium. When needed, a reverse thermochemical reaction reverses the chemical energy back into thermal energy and releases it. Compared to latent heat storage, thermochemical thermal energy storage has advantages such as high thermal density (approximately 5 times that of paraffin wax), long storage time, and low energy loss. For example, CaCl2·6H2O can be dehydrated by heating within a temperature range of 60-100℃ to produce CaCl2·2H2O, with an absorption heat of approximately 1145 J / g. Similarly, CaCl2·2H2O can absorb water in a humid environment to form CaCl2·6H2O, raising the temperature to 50-60℃. Other similar hydrated salts include MgCl2·6H2O, MgSO4·7H2O, and SrBr2·6H2O. However, different hydrated salts vary significantly in parameters such as dehydration / absorption temperature and price. Only the inexpensive CaCl2·6H2O and MgSO4·7H2O are suitable for deep recovery and cross-seasonal utilization of waste heat from waste heat boilers. However, the low thermal conductivity and high mass transfer resistance of hydrated salts result in low water absorption and dehydration rates, significantly affecting the efficiency of waste heat recovery and utilization. Therefore, there is an urgent need for a new technology to significantly improve the water absorption and dehydration rates of hydrated salts, enabling deep recovery and cross-seasonal utilization of waste heat from waste heat boilers. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a heat storage and utilization device for gas waste heat, which can effectively improve the dehydration and water absorption efficiency of hydrated salts, thereby improving the utilization efficiency of hot gas and realizing efficient and long-term utilization of heat.

[0006] To achieve the above objectives, this utility model provides a heat storage and utilization device for waste heat from gas, comprising a first storage tank, a second storage tank, a rotary kiln heat exchanger, a mixing reactor, a water supply device, and a heat utilization heat exchanger. The rotary kiln heat exchanger includes a rotatable kiln shell and a drive mechanism for rotating the kiln shell, and the kiln shell has a heat exchange reaction space. The rotary kiln heat exchanger has an inlet and a gas inlet at one end of the kiln shell along the axial direction, and an outlet and a gas outlet at the other side. The first storage tank stores hydrated salts after water absorption and reaction, and is connected to the inlet of the rotary kiln heat exchanger. The kiln shell is inclined, and the side where the inlet is located is higher than the side where the outlet is located. The outlet is connected to the second storage tank, the second storage tank is connected to the mixing reactor, the water supply device is connected to the mixing reactor, the mixing reactor is connected to the heat utilization heat exchanger, and the heat utilization heat exchanger is connected to the first storage tank.

[0007] Furthermore, the rotary kiln heat exchanger also includes an inner cylinder disposed within the kiln shell, and the space between the kiln shell and the inner cylinder is a heat exchange reaction space.

[0008] Furthermore, the rotary kiln heat exchanger is provided with turbulence fins on the outer circumferential surface of the inner cylinder and the inner wall surface of the kiln cylinder.

[0009] Furthermore, the kiln shell is provided with a fin ring assembly along the axial direction, each fin ring assembly including multiple turbulence fins evenly arranged along the circumference of the kiln shell, and the inner cylinder is provided with a fin ring assembly along the axial direction, each fin ring assembly including multiple turbulence fins evenly arranged along the circumference of the inner cylinder.

[0010] Furthermore, the tilt angle of the rotary kiln heat exchanger is 15–40°.

[0011] Furthermore, it also includes an atomizer installed in the mixing reactor, the atomizer being connected to a water supply device for atomizing the water supplied by the water supply device and sending it to the mixing reactor.

[0012] Furthermore, the hydrated salt stored in the first storage tank is CaCl2·6H2O.

[0013] Furthermore, the heat utilization heat exchanger is a moving bed heat exchanger.

[0014] Furthermore, the gas inlet of the rotary kiln heat exchanger is connected to the waste heat boiler for the entry of flue gas from the waste heat boiler.

[0015] As described above, the heat storage and utilization equipment involved in this utility model has the following beneficial effects:

[0016] 1. In the endothermic dehydration stage, by setting up an inclined rotary kiln heat exchanger, the endothermic dehydration efficiency of hydrated salt can be greatly improved, avoiding problems such as adhesion of hydrated salt during the dehydration process, and the hydrated salt can flow out smoothly. In the water absorption and heat release stage, by setting up a mixing reactor, water and hydrated salt are fully mixed at the same time to complete the water absorption reaction, improving the reaction rate and efficiency. Furthermore, by adopting the method of reaction before heat exchange, the problems of particle agglomeration and caking caused by excessive water absorption and deliquescence of hydrated salt can be effectively avoided. This utility model can effectively ensure continuous and stable operation and effectively improve the utilization rate of gas waste heat.

[0017] 2. By setting up an atomizer, water is atomized and then mixed with hydrated salt to produce a water absorption and exothermic reaction, which has the advantages of fast reaction rate, small equipment footprint and low energy consumption.

[0018] 3. Using a moving bed heat exchanger as a heat utilization heat exchanger can improve the heat exchange reaction between the hydrated salt and the fluid medium after the water absorption and heat release reaction, thereby improving the heat utilization efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the thermal storage and utilization equipment of this utility model.

[0020] Figure 2 for Figure 1 Cross-sectional view of point A of the rotary kiln heat exchanger.

[0021] Figure 3 for Figure 1 Cross-sectional view of section B of the rotary kiln heat exchanger.

[0022] Explanation of icon numbers

[0023] 1 First storage tank

[0024] 2 Second Storage Tank

[0025] 3. Rotary kiln heat exchanger

[0026] 31 Kiln body

[0027] 32 Inner cylinder

[0028] 33. Feed Inlet

[0029] 34 Gas Inlet

[0030] 35 Discharge port

[0031] 36 Gas outlet

[0032] 37. Turbine fins

[0033] 38 motors

[0034] 4. Mixing reactor

[0035] 5. Heat exchanger

[0036] 6. Water supply device

[0037] 7. Atomizer

[0038] 8. Heat Utilization Medium Device

[0039] 9 Waste heat boiler Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0041] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0042] See Figures 1 to 3 This utility model provides a heat storage and utilization device for waste heat from gas, including a first storage tank 1, a second storage tank 2, a rotary kiln heat exchanger 3, a mixing reactor 4, a water supply device 6, and a heat utilization heat exchanger 5. The rotary kiln heat exchanger 3 includes a rotatable kiln shell 31 and a drive mechanism for rotating the kiln shell 31. The kiln shell 31 has a heat exchange reaction space. The rotary kiln heat exchanger 3 has a feed inlet 33 and a gas inlet 34 at one end of the kiln shell 31 along the axial direction, and a discharge outlet 35 and a gas outlet 34 at the other side. The kiln body 31 is inclined, with the side of the inlet 33 of the kiln heat exchanger 35 higher than the side of the outlet 35. The outlet 35 is connected to the second storage tank 2, which is connected to the mixing reactor 4. The water supply device 6 is connected to the mixing reactor 4, which is connected to the heat utilization heat exchanger 5. The heat utilization heat exchanger 5 is connected to the first storage tank 1.

[0043] The main working principle of the thermal storage and utilization equipment involved in this utility model is as follows: See Figure 1The first storage tank 1 stores hydrated salts after the water absorption reaction. The hydrated salts release a large amount of heat during the water absorption reaction, and the resulting product undergoes a dehydration reaction upon absorbing heat. Preferably, the hydrated salt is CaCl2·6H2O, but it can also be other hydrated salts such as MgSO4·7H2O. In this application, the heated gas refers to a gas with corresponding heat and temperature that can heat the hydrated salts and cause a dehydration reaction; for example, it can be the flue gas produced by the waste heat boiler 9. The hydrated salt in the first storage tank 1, taking CaCl2·6H2O as an example, exists in the form of fine particles of appropriate particle size. It enters the heat exchange reaction space inside the kiln shell 31 through the feed inlet. At the same time, the heated gas enters the heat exchange reaction space from the gas inlet 34. The kiln shell 31 of the rotary kiln heat exchanger is driven by the drive mechanism to rotate at a certain speed. Since the kiln shell 31 is inclined, the hydrated salt will undergo a complex motion in the heat exchange reaction space, both rolling in the circumferential direction and moving from the high end to the low end in the axial direction, ensuring that the hydrated salt can move and flow out smoothly. CaCl2·6H2O comes into full contact with and mixes with the heated gas in the heat exchange reaction space, and the two exchange heat fully. During the heat exchange process, CaCl2·6H2O absorbs heat and dehydrates to generate CaCl2·2H2O and water vapor. After the heat exchange is completed, the solid CaCl2·2H2O comes out from the discharge port 35 and enters the second storage tank 2. The cooled gas exits from the gas outlet 36. The heat from the treated hot gas is stored in CaCl2·2H2O, which can be stored for a long time in the second storage tank 2, allowing for cross-seasonal use. This process can be used in summer to recover heat from the flue gas generated by the waste heat boiler 9. When heat is needed, especially in winter, the water supply device 6 supplies water to the mixing reactor 4. The hydrated salt CaCl2·2H2O in the second storage tank 2 enters the mixing reactor 4, where the water and hydrated salt CaCl2·2H2O are thoroughly mixed and reacted to generate CaCl2·6H2O, releasing a large amount of heat energy. The resulting mixture enters the heat utilization heat exchanger 5 from the mixing reactor 4, where it exchanges heat with the fluid medium connected to the heat utilization heat exchanger 5. The heat is transferred to the fluid medium, which can then be transported to the location where heat is needed for utilization. The fluid medium can be water, gas, or other fluids.

[0044] The heat storage and utilization equipment of this utility model enables hydrated salt to be fully mixed with hot gas during the endothermic dehydration reaction and to move smoothly, thereby improving the dehydration efficiency. In the water absorption and heat release reaction of hydrated salt, the mixing reactor 4 fully mixes the hydrated salt with water, thereby improving the efficiency of hot water absorption and release, and thus improving the utilization efficiency of the heat of hot gas. Through long-term stable storage of hydrated salt, the heat can be utilized efficiently and over a long period of time.

[0045] See Figures 1 to 3The present invention will be further described below with reference to a specific embodiment:

[0046] In this embodiment, see Figure 1 , Figure 2 and Figure 3 As a preferred design, the rotary kiln heat exchanger 3 also includes an inner cylinder 32 disposed within the kiln body 31. The inner cylinder 32 is preferably cylindrical and coaxially arranged with the kiln body 31. The space between the kiln body 31 and the inner cylinder 32 is a heat exchange reaction space. The kiln body 31 can rotate relative to the inner cylinder 32. Preferably, the inner cylinder 32 can rotate in the opposite direction to the rotation direction of the kiln body 31, thereby enhancing the movement of hydrated salts in the heat exchange reaction space. Furthermore, turbulence fins 37 are provided on the outer circumferential surface of the inner cylinder 32 and the inner wall surface of the kiln body 31. The kiln body 31 has a fin ring assembly along the axial direction, and each fin ring assembly includes multiple turbulence fins 37 evenly arranged along the circumference of the kiln body 31. Similarly, the inner cylinder 32 has a fin ring assembly along the axial direction, and each fin ring assembly includes multiple turbulence fins 37 evenly arranged along the circumference of the inner cylinder 32. The fin ring assemblies on the kiln body 31 and the fin ring assemblies on the inner cylinder 32 are staggered in the axial direction. In the above manner, during the rotation of the rotary kiln heat exchanger 3, the turbulence fins 37 agitate the hydrated salt and gas, allowing them to come into more complete contact and better preventing the hydrated salt from having poor flow due to high mass transfer resistance.

[0047] In this embodiment, see Figure 1 As a preferred design, the rotary kiln heat exchanger 3 has an inclination angle of 15–40°. The feed inlet 33, gas inlet 34, discharge outlet 35, and gas outlet 36 are all located at both ends of the kiln shell 31, thereby increasing the contact time between the heated gas and the hydrated salt. The drive mechanism includes a motor 38, which can be connected to the kiln shell 31 through a suitable existing intermediate transmission mechanism to drive the kiln shell 31 to rotate, or it can be simultaneously connected to the inner cylinder 32 through a suitable intermediate transmission mechanism to drive the inner cylinder 32 to rotate.

[0048] In this embodiment, see Figure 1 As a preferred design, the device also includes an atomizer 7 installed in the mixing reactor 4. The atomizer 7 is connected to the water supply device 6 and is used to atomize the water supplied by the water supply device 6 and deliver it to the mixing reactor 4. The atomizer 7 preferably atomizes the water into micron-sized water droplets, so that the water can be fully mixed with the hydrated salt under the action of the mixing reactor 4 to complete the water absorption reaction. This design has advantages such as fast reaction rate, small footprint, and low energy consumption. In this invention, the mixing reactor 4 can adopt a suitable existing structure. The mixing principle is similar to that of traditional gas-liquid or liquid-liquid mixers, using a spiral flow channel to achieve mixing under the action of a driving force (such as the gravity of the hydrated salt).

[0049] In this embodiment, see Figure 1As a preferred design, the heat utilization medium device 8 is connected to the heat utilization heat exchanger 5 to provide a fluid medium to the heat utilization heat exchanger 5. The fluid medium is water, but other liquids or gases can also be used. The heated fluid medium is then transported to the plant area for heating or supplied to the waste heat boiler 9. The heat utilization heat exchanger 5 is a moving bed heat exchanger, connected to the lower end of the mixing reactor 4. After the hydrated salt in the mixing reactor 4 reacts with water, it falls to the top of the moving bed heat exchanger. In the moving bed heat exchanger, as the heat exchange process proceeds, the hydrated salt solid particles gradually move downwards and are finally discharged from the bottom. They are then transported and enter the first storage tank 1. Since the mixture entering the moving bed heat exchanger from the mixing reactor 4 is a mixture containing gas, water vapor, and solid particles, during the heat exchange process, the cold fluid medium enters from one end of the moving bed heat exchanger and exchanges heat with the heat exchange tube bundle and solid particle bed in the moving bed heat exchanger, absorbing heat from the solid particles and heat exchange tubes. Therefore, the hydrated salt solid particles also exchange heat with the fluid medium during the movement, playing a role in storing and transferring heat, thus improving heat exchange efficiency. Compared with the traditional scheme of reacting and exchanging heat simultaneously and finally recovering hot air, this embodiment adopts a scheme of reacting first and then exchanging heat, ultimately obtaining hot water that is more convenient to use. The heat exchange process takes place in the moving bed heat exchanger, which can effectively avoid problems such as particle agglomeration and caking caused by excessive water absorption and deliquescence of the hydrated salt, ensuring the continuous and stable operation of the system and effectively improving the utilization rate of waste heat. In other embodiments, the heat utilization heat exchanger 5 can also use other suitable existing heat exchangers that can achieve smooth heat exchange.

[0050] In this invention, the transfer of hydrated salt particles between the first storage tank 1 and the rotary kiln heat exchanger 3, between the rotary kiln heat exchanger 3 and the second storage tank 2, between the second storage tank 2 and the mixing reactor 4, and between the heat utilization heat exchanger 5 and the first storage tank 1 can be achieved by setting up a conveying mechanism. The conveying method can adopt existing suitable methods. For example, a conveyor belt can be set up to transfer the hydrated salt particles from one device to another, and a sealed protective cover can be set up during the transfer process. Alternatively, the transfer can be carried out by setting up pipelines. In some places, gravity feeding can be used for rotation, or a blower can be set up for blowing. These existing methods of conveying and transferring particulate matter are common in factory workshops, so they will not be described in detail.

[0051] In this embodiment, see Figure 1 As a preferred design, the gas inlet 34 of the rotary kiln heat exchanger 3 is connected to the waste heat boiler 9 via a pipeline for the entry of flue gas generated by the waste heat boiler 9. The heat storage and utilization equipment can store the heat of the flue gas from the waste heat boiler 9 in summer and release it for utilization in winter. The heat storage and utilization equipment can also be used for the heat storage and utilization of other types of heat-containing gases in industrial workshops.

[0052] This utility model also provides a method for storing and utilizing waste heat from gas, using the aforementioned heat storage and utilization equipment, comprising:

[0053] S1. Endothermic Dehydration Reaction: The hydrated salt (CaCl2·6H2O) in the first storage tank 1 enters the heat exchange reaction space of the rotary kiln heat exchanger 3. Simultaneously, heated gas also enters the heat exchange reaction space. As the kiln cylinder 31 rotates, the hydrated salt absorbs heat and undergoes a dehydration reaction. The dehydrated hydrated salt (CaCl2·2H2O) exits from the discharge port 35 and enters the second storage tank 2. The cooled gas exits from the gas outlet 36. The hydrated salt (CaCl2·2H2O) can be stored in the second storage tank 2 for a long time, ready for use when needed.

[0054] S2, Mixed water absorption and exothermic reaction: Water supply device 6 delivers water to mixing reactor 4. After atomization, the water enters mixing reactor 4. The hydrated salt (CaCl2·2H2O) in the second storage tank 2 enters mixing reactor 4. Mixing reactor 4 mixes the hydrated salt (CaCl2·2H2O) with the hydrated salt. The hydrated salt undergoes a water absorption reaction and generates heat to obtain hydrated salt (CaCl2·6H2O). The high-temperature mixture after the reaction enters heat exchanger 5.

[0055] S3. Heat utilization: The heat utilization heat exchanger 5 is connected to the fluid medium. The high-temperature mixed substance heats the fluid medium through heat exchange, and the fluid medium is transported to the utilization site. The hydrated salt (CaCl2·2H2O) after heat exchange returns from the heat utilization heat exchanger 5 to the first storage tank 1 for recycling.

[0056] As can be seen from the above, the heat storage and utilization equipment of this utility model has the following beneficial effects:

[0057] 1. In the heat absorption and dehydration stage, by setting an inclined rotary kiln heat exchanger 3, the heat absorption and dehydration efficiency of hydrated salt can be greatly improved, avoiding problems such as adhesion of hydrated salt during the dehydration process, and the hydrated salt can flow out smoothly; in the water absorption and heat release stage, by setting a mixing reactor 4, water and hydrated salt are fully mixed at the same time to complete the water absorption reaction, improving the reaction rate and efficiency. Moreover, by adopting the method of reaction before heat exchange, the problems of particle agglomeration and caking caused by excessive water absorption and deliquescence of hydrated salt can be effectively avoided. This utility model can effectively ensure continuous and stable operation and effectively improve the utilization rate of gas waste heat.

[0058] 2. By setting up an atomizer 7, water is atomized and then mixed with hydrated salt to produce a water absorption and exothermic reaction, which has the advantages of fast reaction rate, small device footprint and low energy consumption.

[0059] 3. Using a moving bed heat exchanger as the heat utilization heat exchanger 5 can improve the heat exchange reaction between the hydrated salt and the fluid medium after the water absorption and heat release reaction, thereby improving the heat utilization efficiency.

[0060] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0061] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A heat storage utilization device for gas waste heat, characterized by: The application relates to a heat exchange device, which comprises a first storage tank (1), a second storage tank (2), a rotary kiln type heat exchanger (3), a mixing reactor (4), a water supply device (6) and a heat utilization heat exchanger (5), wherein the rotary kiln type heat exchanger (3) comprises a rotatable kiln cylinder (31) and a driving mechanism for driving the kiln cylinder (31) to rotate, and the kiln cylinder (31) has a heat exchange reaction space; the rotary kiln type heat exchanger (3) is provided with a feeding port (33) and a gas inlet (34) at one end of the kiln cylinder (31) along the axial direction, and is provided with a discharging port (35) and a gas outlet (36) at the other end; the first storage tank (1) is used for storing hydrated salt after water absorption reaction and is connected with the feeding port (33) of the rotary kiln type heat exchanger (3); the kiln cylinder (31) is arranged in an inclined mode, and the side where the feeding port (33) is located is higher than the side where the discharging port (35) is located; the discharging port (35) is connected with the second storage tank (2); the second storage tank (2) is connected with the mixing reactor (4); the water supply device (6) is connected with the mixing reactor (4); the mixing reactor (4) is connected with the heat utilization heat exchanger (5); and the heat utilization heat exchanger (5) is connected with the first storage tank (1).

2. The thermal storage utilization apparatus according to claim 1, characterized by: The rotary kiln type heat exchanger (3) further comprises an inner cylinder (32) arranged in the kiln cylinder (31), and the space between the kiln cylinder (31) and the inner cylinder (32) is the heat exchange reaction space.

3. The thermal storage utilization apparatus according to claim 2, characterized by: The outer circumferential surface of the inner cylinder (32) and the inner wall surface of the kiln cylinder (31) are both provided with turbulence fins (37).

4. The thermal storage utilization apparatus according to claim 3, characterized by: The kiln cylinder (31) is provided with a plurality of fin ring groups along the axial direction, and each fin ring group comprises a plurality of turbulence fins (37) arranged uniformly along the circumferential direction of the kiln cylinder (31); and the inner cylinder (32) is provided with a plurality of fin ring groups along the axial direction, and each fin ring group comprises a plurality of turbulence fins (37) arranged uniformly along the circumferential direction of the inner cylinder (32).

5. The thermal storage utilization apparatus according to claim 1, characterized by: The inclination angle of the rotary kiln type heat exchanger (3) is 15-40 degrees.

6. The thermal storage utilization apparatus according to claim 1, characterized by: The heat exchange device further comprises an atomizer (7) arranged in the mixing reactor (4), which is connected with the water supply device (6) and is used for atomizing the water supplied by the water supply device (6) and sending the atomized water into the mixing reactor (4).

7. The thermal storage utilization apparatus according to claim 1, characterized by: The hydrated salt stored in the first storage tank (1) is CaCl2.6H2O.

8. The thermal storage utilization apparatus of claim 1, wherein: The heat utilization heat exchanger (5) is a moving bed heat exchanger.

9. The thermal storage utilization apparatus of claim 1, wherein: The gas inlet (34) of the rotary kiln type heat exchanger (3) is connected with a waste heat boiler, and is used for the waste heat boiler flue gas to enter.

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