Honeycomb ceramic heat accumulator for gas power generation device and preparation method of honeycomb ceramic heat accumulator

Abstract

The invention provides a honeycomb ceramic heat accumulator for a gas power generation device and a preparation method of the honeycomb ceramic heat accumulator, and relates to the technical field of heat accumulators. The heat accumulator is provided with the first channel and the second channel which are adjacent, and the first channel and the second channel are both of a hopper-shaped structure but are opposite in opening direction, so that efficient storage and quick release of heat energy are achieved. Through specific preparation steps including honeycomb ceramic matrix preparation, surface treatment, high-temperature sintering, fine processing and performance testing, high performance and stability of the heat accumulator are ensured. By means of the design, the flexibility and stability of heat energy management are improved, and powerful support is provided for further development of the gas power generation technology.

Description

Technical Field

[0001] The invention relates to the technical field of heat storage bodies, in particular to a honeycomb ceramic heat storage body for a gas power generation device and a preparation method thereof. Background Art

[0002] In the energy field, gas power generation, as an efficient and clean way of power generation, has attracted more and more attention. However, the effective management and utilization of thermal energy in the process of gas power generation has always been one of the technical difficulties. Traditional heat storage bodies, such as metal heat storage bodies and graphite heat storage bodies, although they can store and release thermal energy to a certain extent, have many limitations. Metal heat storage bodies are easily oxidized and corroded at high temperatures, resulting in performance degradation; graphite heat storage bodies have problems such as high cost and difficulty in processing. In addition, these traditional heat storage bodies often have defects such as low efficiency and poor stability in the process of thermal energy storage and release, which seriously affects the overall performance and service life of gas power generation devices.

[0003] In particular, in the high-temperature and high-pressure gas power generation environment, the challenges faced by traditional thermal storage bodies are even more severe. High-temperature environments easily lead to the degradation of thermal storage material performance, such as decreased thermal conductivity and structural deformation, while high-pressure environments place higher requirements on the mechanical strength of thermal storage bodies. Therefore, there is an urgent need for a new type of thermal storage body that can maintain efficient and stable thermal energy storage and release capabilities under complex working conditions to meet the urgent needs of gas power generation devices for thermal energy management. Summary of the invention

[0004] The present invention aims to provide a honeycomb ceramic heat storage body for a gas power generation device and a preparation method thereof, which realizes efficient storage of thermal energy and rapid release on demand through a unique design of a first channel and a second channel, and significantly improves the flexibility and stability of thermal energy management.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A honeycomb ceramic heat storage body for a gas power generation device comprises a plurality of adjacently arranged first channels and second channels, wherein each of the second channels is evenly distributed between each of the first channels; The first channel and the second channel are both in a bucket-shaped structure with one end larger than the other, wherein the end with a larger opening of the first channel is a first inlet, and the end with a smaller opening is a first outlet, and the end with a larger opening of the second channel is a second outlet, and the end with a smaller opening is a second inlet; The first inlet and the second inlet are located on the same side of the honeycomb ceramic thermal storage body; The first outlet and the second outlet are located on the same side of the honeycomb ceramic thermal storage body.

[0006] In some embodiments, the ratio of the number of the first channels to the number of the second channels is 5-10:1.

[0007] In some embodiments, spiral patterns are provided on the inner walls of the first channel and the second channel.

[0008] In some embodiments, the honeycomb ceramic thermal storage body is made of silicon carbide or alumina-based composite materials.

[0009] A method for preparing a honeycomb ceramic heat storage body, which is used to prepare the honeycomb ceramic heat storage body for the gas power generation device, comprises the following steps: A honeycomb ceramic substrate of a preset shape and size is prepared, wherein a plurality of adjacent first channels and second channels are preset, the second channels are evenly distributed between the first channels, and the first channels and the second channels are both in a bucket-shaped structure with one end larger than the other; Surface treatment of the honeycomb ceramic matrix to improve high temperature resistance and heat exchange efficiency; The processed honeycomb ceramic matrix is ​​sintered at high temperature to fix the shape and enhance the mechanical strength and thermal shock resistance; Cutting, grinding and cleaning the sintered honeycomb ceramic matrix; The processed honeycomb ceramic heat storage body is tested for heat resistance, heat exchange efficiency and pressure loss; Packaging and storage of qualified honeycomb ceramic thermal storage bodies.

[0010] In some embodiments, after the high temperature sintering step, the method further comprises: Dipping coating step: dipping the sintered honeycomb ceramic substrate into a slurry containing a high temperature resistant and high thermal conductivity material, drying and curing, so as to form a reinforcement coating on the inner wall of the channel; The high temperature resistant and high thermal conductivity material is one or more of silicon carbide, silicon nitride, zirconium oxide or a composite thereof.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a unique first channel and second channel design to enable high-temperature gas to form a stable flow rate and pressure distribution when flowing through the heat storage body, thereby achieving efficient storage of thermal energy and rapid release on demand. This design not only improves the utilization rate of thermal energy, but also reduces thermal energy loss and improves the overall efficiency of the gas power generation device.

[0012] The honeycomb ceramic material used in the present invention has excellent high temperature resistance and mechanical strength, combined with sophisticated preparation technology and strict quality control, which ensures the structural stability and long service life of the heat storage body under high temperature and high pressure environment. This greatly reduces maintenance costs and improves the economy and reliability of gas power generation devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1Schematic diagram of the external structure of the heat storage body of the present invention (top view); Figure 2 Schematic diagram of the external structure of the heat storage body of the present invention (looking from above); Figure 3 It is a cross-sectional schematic diagram of the heat storage body of the present invention.

[0014] In the figure: 1, first channel; 101, first entrance; 102, first exit; 2, second channel; 201, second entrance; 202, second exit. DETAILED DESCRIPTION

[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0016] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] like Figure 1-3As shown, this embodiment provides a honeycomb ceramic heat storage body for a gas power generation device, comprising a plurality of adjacently arranged first channels 1 and second channels 2, wherein each second channel 2 is evenly distributed between each first channel 1; The first channel 1 and the second channel 2 are both in a bucket-shaped structure with one end larger than the other, wherein the first channel 1 has a larger opening at one end as the first inlet 101 and a smaller opening at one end as the first outlet 102, and the second channel 2 has a larger opening at one end as the second outlet 202 and a smaller opening at one end as the second inlet 201; The first inlet 101 and the second inlet 201 are located on the same side of the honeycomb ceramic thermal storage body; The first outlet 102 and the second outlet 202 are located on the same side of the honeycomb ceramic thermal storage body.

[0020] In the honeycomb ceramic heat storage body for the gas power generation device proposed in the present invention, the first channel 1 and the second channel 2 adopt a unique opening design, that is, the first channel 1 uses the large end as the inlet and the small end as the outlet, while the second channel 2 is the opposite, with the small end as the inlet and the large end as the outlet. Such a design is the key to improving the flexibility and stability of thermal energy management. This design cleverly utilizes the principles of fluid mechanics and thermodynamics, and realizes efficient storage and rapid release of thermal energy on demand by changing the flow rate and pressure distribution of the gas in the channel. Specifically, when the high-temperature gas enters from the large end (first inlet 101) of the first channel 1, the flow rate of the gas will gradually increase due to the gradual narrowing of the channel. This accelerated flow not only increases the contact frequency and contact time between the gas and the surface of the heat storage body, thereby promoting heat exchange, but also makes the gas have higher kinetic energy when it flows out of the small end (first outlet 102), which is conducive to transferring heat energy to the subsequent power generation system or energy storage device. At the same time, as the channel narrows, the gas pressure will gradually increase. This pressure change helps to store heat energy in the gas in the form of compressed energy, further improving the storage efficiency of heat energy. When heat energy needs to be released, low-temperature gas or air enters from the small end (second inlet 201) of the second channel 2. As the channel gradually expands, the flow rate of the gas will slow down, which is conducive to the gradual release of the heat energy previously stored in the heat storage body into the gas, realizing the recovery and utilization of heat energy. As the channel expands, the gas pressure gradually decreases. This pressure change promotes the release of heat energy, so that the gas has a higher temperature and lower pressure when it flows out of the large end (second outlet 202), which is very suitable for subsequent power generation or heat energy utilization processes. Therefore, in the first channel 1, the accelerated flow and increased pressure of the high-temperature gas jointly promote the effective storage of heat energy. This storage method is not only efficient, but also can maintain the stability of heat energy and avoid the rapid loss of heat energy. In the second channel 2, the decelerated flow and reduced pressure of the low-temperature gas are conducive to the rapid release of heat energy. This release method can be flexibly adjusted according to actual needs to meet the needs of different power generation or heat energy utilization scenarios. Such a unique channel design ensures that the gas can form a stable flow rate and pressure distribution when flowing through the heat storage body, avoiding heat energy loss and instability caused by flow rate or pressure fluctuations. This stability is critical to maintaining efficient operation and long-term reliability of gas power generation equipment.

[0021] In summary, the honeycomb ceramic heat storage body proposed in the present invention realizes efficient storage and rapid release of thermal energy on demand through the different opening designs of the first channel 1 and the second channel 2, significantly improves the flexibility and stability of thermal energy management, and provides strong support for the further development and application of gas power generation technology.

[0022] In some embodiments, the ratio of the number of first channels 1 to that of second channels 2 is 5 to 10:1. Since the number of first channels 1 is much greater than that of second channels 2, the high-temperature gas has more opportunities to contact and exchange heat with the surface of the heat storage body when flowing through the heat storage body. The dense arrangement of the first channels 1 ensures that the gas can fully transfer heat energy to the heat storage body, thereby improving the heat exchange efficiency. And when it is necessary to store heat energy quickly, a large number of first channels 1 can quickly absorb the heat energy of the high-temperature gas and store it in the heat storage body. When it is necessary to release heat energy, although the number of second channels 2 is small, due to its unique opening design, it can efficiently release the stored heat energy to the low-temperature gas or air, meeting the demand for rapid response.

[0023] In some embodiments, spiral patterns are provided on the inner walls of the first channel 1 and the second channel 2. The presence of the spiral pattern increases the contact area between the gas and the inner wall of the heat storage body, making the heat exchange more sufficient. When the gas flows through the channel with the spiral pattern, it will constantly collide and rub with the pattern surface, thereby promoting the transfer of heat energy. Moreover, in fluid dynamics, the presence of the boundary layer will hinder heat exchange. The spiral pattern can destroy the boundary layer formed by the gas on the inner wall of the channel, making the heat exchange between the gas and the heat storage body more efficient. In addition, the design of the spiral pattern helps to form turbulence in the channel, and the turbulence can enhance the mixing and disturbance of the gas, further improving the heat exchange efficiency. The spiral pattern can also guide the flow direction of the gas in the channel, making the airflow more uniform and stable. This guiding effect helps to reduce the turbulence and vortex of the airflow in the channel, thereby reducing the flow resistance.

[0024] In some embodiments, the honeycomb ceramic heat storage body is made of silicon carbide (SiC) or aluminum oxide (Al2O3) based composite materials. First, silicon carbide and aluminum oxide based composite materials have extremely high melting points and can withstand the erosion of high-temperature gas during gas power generation without melting or deformation, ensuring the structural integrity and long-term stability of the heat storage body. Secondly, these materials have good thermal shock resistance, can resist thermal stress caused by rapid temperature changes, and avoid the risk of thermal cracking and breakage. In addition, silicon carbide and aluminum oxide based composite materials can maintain stable performance during long-term use, are not prone to aging or degradation, and ensure the long-term reliability and stability of gas power generation devices. These materials have strong resistance to corrosive components in gas, can extend the service life of the heat storage body and reduce maintenance costs. In addition, silicon carbide and aluminum oxide based composite materials have high mechanical strength, can withstand mechanical stress and vibration during gas power generation, and enhance the structural safety of the heat storage body.

[0025] This embodiment also provides a method for preparing a honeycomb ceramic heat storage body, which is used to prepare the honeycomb ceramic heat storage body for the gas power generation device, and comprises the following steps: A honeycomb ceramic matrix with a preset shape and size is prepared, wherein a plurality of adjacent first channels 1 and second channels 2 are preset in the honeycomb ceramic matrix, each second channel 2 is evenly distributed between each first channel 1, and each first channel 1 and second channel 2 are in a bucket-shaped structure with one end larger than the other; The honeycomb ceramic matrix is ​​subjected to surface treatment to improve its high temperature resistance and heat exchange efficiency; the surface treatment steps include but are not limited to spraying a high temperature resistant coating, performing a surface roughening treatment or a permeability treatment to enhance the ceramic material's gas adsorption capacity and heat conduction performance, ensuring that the structure can still maintain stability and a long service life in a high temperature environment; The processed honeycomb ceramic matrix is ​​sintered at high temperature to fix its shape and further enhance its mechanical strength and thermal shock resistance. During the high-temperature sintering process, the sintering temperature and time are precisely controlled to ensure that the channel structure in the honeycomb ceramic matrix does not deform, while making the ceramic material denser and reducing the porosity, thereby improving the storage and transfer efficiency of thermal energy. The sintered honeycomb ceramic matrix is ​​finely processed, including cutting, grinding and cleaning, to ensure that its dimensional accuracy and surface finish meet the requirements of the gas power generation device; this step is to eliminate any defects or unevenness that may be caused by the manufacturing process, to ensure that the honeycomb ceramic heat storage body can be tightly installed in the gas power generation device, and reduce heat leakage and flow resistance; The processed honeycomb ceramic thermal storage body is subjected to performance tests, including heat resistance test, heat exchange efficiency test and pressure loss test, to ensure that it meets the design specifications and actual application requirements. This step is the key to quality control. Through rigorous testing and verification, it can be ensured that each honeycomb ceramic thermal storage body can play the best performance in actual applications. The honeycomb ceramic thermal storage bodies that pass the test will be packaged and stored for subsequent installation and use.

[0026] The honeycomb ceramic heat storage body prepared by this method has excellent high temperature resistance and heat exchange efficiency due to fine processing and strict quality control, and also ensures structural stability and long service life. Its unique design of the first channel 1 and the second channel 2, combined with the precise preparation process, enables the honeycomb ceramic heat storage body to efficiently store and release heat energy in the gas power generation device, improving the thermal energy management flexibility and stability of the entire system. In addition, the preparation method has high repeatability and controllability, is suitable for large-scale production, and provides reliable technical support for the widespread application of gas power generation technology.

[0027] In some embodiments, after the high-temperature sintering step, an immersion coating step is also included, that is, the sintered honeycomb ceramic matrix is ​​immersed in a slurry containing a high-temperature resistant and high thermal conductivity material, followed by drying and curing to form a layer of reinforced coating on the inner wall of the channel; the high-temperature resistant and high thermal conductivity material includes but is not limited to silicon carbide, silicon nitride, zirconium oxide or their composites.

[0028] First, the enhanced coating further improves the high temperature resistance of the thermal storage body. Since the coating material itself has an extremely high melting point and thermal shock resistance, it can effectively protect the honeycomb ceramic matrix from direct erosion and thermal stress of high temperature gas, thereby extending the service life of the thermal storage body.

[0029] Secondly, the enhanced coating greatly improves the heat exchange efficiency. The coating material usually has excellent thermal conductivity and can quickly transfer the heat energy in the gas to the thermal storage body, or release the heat energy in the thermal storage body to the gas. This efficient heat transfer characteristic enables the honeycomb ceramic thermal storage body to respond to temperature changes more quickly in the gas power generation device, improving the thermal energy management flexibility of the entire system.

[0030] In addition, the enhanced coating also enhances the corrosion resistance of the thermal storage body. Gas may contain some corrosive components, which will corrode the ceramic material. The coating material usually has a strong resistance to these corrosive components, thereby protecting the honeycomb ceramic matrix from corrosion and further extending the service life of the thermal storage body.

[0031] Finally, the addition of the dip coating step does not significantly increase the complexity and cost of the preparation method. On the contrary, since the coating material can evenly cover the inner wall of the channel to form a continuous and dense protective layer, no additional processing or treatment steps are required. This makes the preparation method still highly reproducible and controllable, suitable for large-scale production.

[0032] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A honeycomb ceramic heat storage body for a gas power generation device, characterized in that: It comprises a plurality of adjacently arranged first channels (1) and second channels (2), wherein each of the second channels (2) is evenly distributed between each of the first channels (1); The first channel (1) and the second channel (2) are both in a bucket-shaped structure with one end larger than the other, wherein the end of the first channel (1) with a larger opening is a first inlet (101) and the end with a smaller opening is a first outlet (102); the end of the second channel (2) with a larger opening is a second outlet (202) and the end with a smaller opening is a second inlet (201); The first inlet (101) and the second inlet (201) are located on the same side of the honeycomb ceramic thermal storage body; The first outlet (102) and the second outlet (202) are located on the same side of the honeycomb ceramic thermal storage body.

2. The honeycomb ceramic heat storage body for a gas power generation device according to claim 1, characterized in that: The ratio of the number of the first channels (1) to the number of the second channels (2) is 5-10:

1.

3. The honeycomb ceramic heat storage body for a gas power generation device according to claim 1, characterized in that: The inner walls of the first channel (1) and the second channel (2) are both provided with spiral patterns.

4. The honeycomb ceramic heat storage body for a gas power generation device according to claim 1, characterized in that: The honeycomb ceramic heat storage body is made of silicon carbide or aluminum oxide based composite material.

5. A method for preparing a honeycomb ceramic heat storage body, the method being used for preparing the honeycomb ceramic heat storage body for a gas power generation device according to any one of claims 1 to 4, characterized in that: The following steps are involved: A honeycomb ceramic substrate of a preset shape and size is prepared, wherein a plurality of adjacent first channels (1) and second channels (2) are preset, the second channels (2) are evenly distributed between the first channels (1), and the first channels (1) and the second channels (2) are both in a bucket-shaped structure with one end larger than the other; Surface treatment of the honeycomb ceramic matrix to improve high temperature resistance and heat exchange efficiency; The processed honeycomb ceramic matrix is ​​sintered at high temperature to fix the shape and enhance the mechanical strength and thermal shock resistance; Cutting, grinding and cleaning the sintered honeycomb ceramic matrix; The processed honeycomb ceramic thermal storage body is tested for heat resistance, heat exchange efficiency and pressure loss; Packaging and storage of qualified honeycomb ceramic thermal storage bodies.

6. The method for preparing a honeycomb ceramic thermal storage body according to claim 5, characterized in that: After the high temperature sintering step, it also includes: Dipping coating step: dipping the sintered honeycomb ceramic substrate into a slurry containing a high temperature resistant and high thermal conductivity material, drying and curing, so as to form a reinforcement coating on the inner wall of the channel; The high temperature resistant and high thermal conductivity material is one or more of silicon carbide, silicon nitride, zirconium oxide or a composite thereof.

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