A silicon powder flushing type heat accumulating structure

Abstract

This utility model relates to the technical field of waste gas treatment equipment, and in particular to a regenerative thermal structure for easy silicon powder flushing. It includes an outer shell, inside which are staggered upper and lower heat storage bodies. The upper heat storage body divides the interior of the shell into two independent functional areas: a combustion decomposition chamber and a silicon powder cleaning chamber. An inclined concrete inner insulation layer is fixedly installed inside the shell, located directly below the upper heat storage body. A manhole and a maintenance observation port are provided on the side wall of the shell. The manhole communicates with the combustion decomposition chamber, and the observation port communicates with the silicon powder cleaning chamber. Conveying components are provided on both sides of the shell. This utility model divides the interior of the shell into two independent functional areas—the combustion decomposition chamber and the silicon powder cleaning chamber—by using the upper heat storage body, providing a dedicated channel and space for silicon powder collection and cleaning, effectively reducing the impact on key components inside the RTO during silicon powder flushing, and lowering maintenance costs.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, and in particular to a heat storage structure that facilitates silicon powder washing. Background Technology

[0002] A regenerative thermal oxidizer (RTO) is a highly efficient organic waste gas treatment device. A typical RTO system mainly consists of a combustion chamber, a heat storage body, an internal insulation layer, inlet and outlet air ducts, and a valve switching system. During operation, the waste gas is preheated after passing through the high-temperature heat storage body, and then enters the combustion chamber for complete combustion and decomposition into carbon dioxide and water. The purified gas transfers heat back to the heat storage body during the discharge process, thereby realizing the recycling of heat. It has significant advantages such as high thermal efficiency and low operating costs.

[0003] However, when treating exhaust gas containing organosilicon compounds, solid silicon powder is generated during the decomposition of the gas in the combustion chamber. The silicon powder easily adheres to the surface of the heat storage medium's pores, the inner wall of the combustion chamber, and the internal insulation material. As the operating time accumulates, the silicon powder will cause blockage of the heat storage medium's pores, resulting in a sharp increase in equipment pressure drop, a decrease in the treated air volume, and a decrease in heat exchange efficiency, which seriously disrupts the system's thermal balance. Regular cleaning of the silicon powder is required.

[0004] High-pressure water jets are often used to clean and maintain silicon powder, but the water flow can easily erode and damage the inner insulation layer of ceramic fiber material inside the equipment shell. At the same time, water accumulation can easily corrode the air intake and exhaust pipes, which greatly reduces the lifespan of key components inside the RTO, increases maintenance costs, and is very detrimental to normal operation.

[0005] Therefore, to address the above issues, a heat storage structure that facilitates silicon powder rinsing can be designed. By optimizing the layout of the heat storage body and the internal space design, while ensuring thermal efficiency, a dedicated channel and space are provided for the collection and cleaning of silicon powder, effectively reducing the impact on key components inside the RTO during silicon powder rinsing and lowering maintenance costs. Utility Model Content

[0006] To overcome the problems that when cleaning silicon powder, the rinsing water flow can easily erode the inner insulation layer structure of the ceramic fiber material inside the shell, and the water accumulation can easily corrode the air intake and exhaust pipes, shorten the service life of key RTO components, and cause a surge in maintenance costs and a decrease in operational reliability.

[0007] The technical solution of this utility model is as follows: a heat storage structure for easy washing of silicon powder, including an outer shell with a ceramic fiber inner insulation layer on the inner wall, and an upper heat storage body and a lower heat storage body disposed inside the outer shell. The two are arranged in an alternating manner. The upper heat storage body divides the interior of the outer shell into two independent functional areas: a combustion decomposition chamber and a silicon powder cleaning chamber. A concrete inner insulation layer with an inclined upper end is fixedly installed inside the outer shell. The concrete inner insulation layer is located directly below the upper heat storage body. The side wall of the outer shell has a maintenance manhole and a maintenance observation port. The maintenance manhole is connected to the combustion decomposition chamber, and the maintenance observation port is connected to the silicon powder cleaning chamber. A drainage component is provided at the lower end of the concrete inner insulation layer, and conveying components are provided on both sides of the outer shell.

[0008] Preferably, the conveying components allow for the transport of exhaust gas into the outer casing. A manhole allows for the insertion of a high-pressure water gun into the combustion chamber to rinse the upper heat storage unit when silica powder needs to be removed. After rinsing, the silica powder-containing water flows down from the holes in the upper heat storage unit, falls onto the inner concrete insulation layer, and is then guided to the drainage components for discharge. The lower heat storage unit is arranged alternately with the upper heat storage unit, and the rinsing water only acts on the upper heat storage unit area that has participated in combustion decomposition. The lower heat storage unit, which is not in direct contact with the combustion chamber, avoids the impact of water rinsing, effectively extending its service life. Simultaneously, the conveying components located on both sides of the outer casing are isolated from the rinsing area and are protected from water accumulation. After rinsing, silica powder residue can be observed on the surface of the inner concrete insulation layer through the maintenance observation port. If necessary, a second high-pressure water gun can be inserted to perform surface rinsing, preventing silica powder from adhering to the inner concrete insulation layer and drying, which could cause secondary pollution to the lower heat storage unit and conveying components, ensuring the long-term operational stability of the system.

[0009] Preferably, a high-temperature resistant steel grating is fixedly installed inside the outer shell, and the high-temperature resistant steel grating is located below the upper heat storage body.

[0010] Preferably, a connecting duct is connected to the lower end of the outer shell, and the connecting duct is located at the lower end of the lower heat storage body.

[0011] Preferably, the conveying assembly includes a lifting valve and a conveying duct, with the lifting valve connected to one end of the connecting duct and the conveying duct connected to the lower end of the lifting valve.

[0012] Preferably, the drainage assembly includes a drainage pipe that extends through the lower end of the housing, with the inlet of the drainage pipe located at the bottom of the sloping concrete inner insulation layer, and a valve installed around the drainage pipe.

[0013] As a preferred option, both the inspection manhole and the maintenance observation port are fitted with a set of sealing covers by bolts.

[0014] Preferably, a heat insulation layer is provided on one side of the sealing cover, and a handle is fixedly installed on the other side of the sealing cover.

[0015] The beneficial effects of this utility model are: During cleaning, first remove the sealing cover plate around the maintenance manhole, then insert a high-pressure water gun through the manhole into the combustion and decomposition chamber to rinse the upper heat storage body. After rinsing, the water containing silica powder flows down from the holes of the upper heat storage body, falls onto the inner insulation layer of the concrete, and is then guided to the drainage pipe for discharge. Since the lower and upper heat storage bodies are arranged alternately, the rinsing water only acts on the upper heat storage body that has participated in the combustion and decomposition of exhaust gas. The lower heat storage body, which is not in direct contact with the combustion chamber, can avoid the impact of water rinsing, effectively extending its service life. At the same time, the conveying pipes arranged on both sides of the outer shell are isolated from the rinsing area and are not affected by water accumulation. After the rinsing operation is completed, the maintenance observation port can be used to observe the silica powder residue on the surface of the inner insulation layer of the concrete. If necessary, a second high-pressure water gun can be inserted to perform surface rinsing to prevent silica powder from adhering to the surface of the inner insulation layer of the concrete and drying, causing secondary pollution to the lower heat storage body and conveying components, and ensuring the long-term operational stability of the system. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of the heat storage structure of this utility model that is easy to wash away with silicon powder. Figure 2 The diagram shown is a three-dimensional structural representation of the outer shell of the heat storage structure of this utility model, which is designed for easy washing of silicon powder. Figure 3 The diagram shows a three-dimensional structure of the outer shell of the heat storage structure sealing cover of this utility model with the silicon powder rinsing type in the open state. Figure 4 The diagram shown is a three-dimensional cross-sectional view of the outer shell of the heat storage structure of this utility model, which is easy to clean with silicon powder. Explanation of reference numerals in the attached drawings: 1. Outer shell; 101. Combustion decomposition chamber; 102. Silica powder cleaning chamber; 103. Concrete internal insulation; 104. Inspection manhole; 105. Maintenance observation port; 2. Upper heat storage body; 201. High-temperature resistant steel grating; 3. Lower heat storage body; 4. Connecting air duct; 501. Lifting valve; 502. Conveying air duct; 601. Drainage pipe; 602. Valve; 7. Sealing cover plate; 701. Insulation layer; 702. Handle. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please see Figure 1 and Figure 4This utility model provides an embodiment of a heat storage structure for easy washing of silicon powder. The structure includes an outer shell 1 with a ceramic fiber inner insulation layer on its inner wall, and an upper heat storage body 2 and a lower heat storage body 3 arranged alternately inside the outer shell 1. The upper heat storage body 2 divides the interior of the outer shell 1 into two independent functional areas: a combustion decomposition chamber 101 and a silicon powder cleaning chamber 102. A concrete inner insulation layer 103 with an inclined upper end is fixedly installed inside the outer shell 1, located directly below the upper heat storage body 2. A maintenance manhole 104 and a maintenance observation port 105 are provided on the side wall of the outer shell 1. The maintenance manhole 104 communicates with the combustion decomposition chamber 101, and the maintenance observation port 105 communicates with the silicon powder cleaning chamber 102. A drainage component is provided at the lower end of the concrete inner insulation layer 103, and conveying components are provided on both sides of the outer shell 1. The conveying components allow for the transport of waste gas inside the outer shell 1. By providing a maintenance manhole 104, a high-pressure water gun can be inserted into the combustion and decomposition chamber 101 to rinse the upper heat storage body 2 when silica powder needs to be cleaned. After rinsing, the silica powder-containing water flows down from the holes of the upper heat storage body 2, falls onto the concrete inner insulation layer 103, and is then guided to the drainage component for discharge. The lower heat storage body 3 is arranged alternately with the upper heat storage body 2. The rinsing water only acts on the area of ​​the upper heat storage body 2 that has participated in combustion and decomposition. The lower heat storage body 3, which is not in direct contact with the combustion chamber, can avoid the impact of water rinsing, effectively extending its service life. At the same time, the conveying components arranged on both sides of the outer shell 1 are isolated from the rinsing area and are not affected by water accumulation. After the rinsing operation is completed, the silica powder residue on the surface of the concrete inner insulation layer 103 can be observed through the maintenance observation port 105. If necessary, a second high-pressure water gun can be inserted to perform surface rinsing to prevent silica powder from adhering to the surface of the concrete inner insulation layer 103 and drying, causing secondary pollution to the lower heat storage body 3 and the conveying components, thus ensuring the long-term operational stability of the system.

[0019] Please see Figure 1 and Figure 2 In this embodiment, a connecting duct 4 is connected to the lower end of the outer shell 1, and the connecting duct 4 is located at the lower end of the lower heat storage body 3. The connecting duct 4 connects the conveying component to the outer shell 1. The conveying component includes a lifting valve 501 and a conveying duct 502. The lifting valve 501 is connected to one end of the connecting duct 4, and the conveying duct 502 is connected to the lower end of the lifting valve 501. The waste gas is conveyed through the conveying duct 502. After being switched by the lifting valve 501, the waste gas enters the interior of the outer shell 1 through the connecting duct 4 to complete the waste gas treatment process. The drainage component includes a drainage pipe 601 connected to the lower end of the outer shell 1. The inlet of the drainage pipe 601 is located at the bottom of the inclined concrete inner insulation layer 103. A valve 602 is provided around the drainage pipe 601. The valve 602 controls the drainage pipe 601, so that the silica-containing wastewater after rinsing is discharged from the drainage pipe 601.

[0020] Please see Figure 3 and Figure 4 In this embodiment, a high-temperature resistant steel grating plate 201 is fixedly installed inside the outer shell 1, and the high-temperature resistant steel grating plate 201 is located below the upper heat storage body 2. The high-temperature resistant steel grating plate 201 is used to modularly install the upper heat storage body 2, which facilitates the maintenance and replacement of the upper heat storage body 2. A set of sealing cover plates 7 are fixedly installed on the periphery of the inspection manhole 104 and the maintenance observation port 105 by bolts. A heat insulation layer 701 is provided on one side of the sealing cover plate 7, and a handle 702 is fixedly installed on the other side of the sealing cover plate 7. By setting the sealing cover plate 7, the inspection manhole 104 and the maintenance observation port 105 are blocked during normal operation. The heat insulation layer 701 can reduce heat loss. The handle 702 makes it easy to hold and remove the sealing cover plate 7.

[0021] During operation, the solvent-containing waste gas in the conveying air duct 502 is switched by the lifting valve 501 and enters the connecting air duct 4. After passing through the lower heat storage body, it absorbs heat and reaches 300-600 degrees Celsius when it reaches the silicon powder cleaning chamber 102. Then, it passes through the upper heat storage body, where the temperature reaches over 750 degrees Celsius and reaches the combustion decomposition chamber 101. Here, it undergoes thermal decomposition to form clean gas and silicon powder. The silicon powder will adhere to the top surface of the upper heat storage body and the inner wall of the holes, accumulating continuously. The exhaust air is switched by the lifting valve 501, and the airflow is discharged in the opposite direction according to the above path, transferring the heat to the upper heat storage body 2 and the lower heat storage body 3. After long-term operation, silicon powder accumulates and needs to be cleaned. During the cleaning operation, the sealing cover plate 7 around the maintenance manhole 104 is removed first. A high-pressure water gun is inserted into the combustion and decomposition chamber 101 through the maintenance manhole 104 to rinse the upper heat storage body 2. After rinsing, the water containing silicon powder flows down from the holes of the upper heat storage body 2, falls onto the concrete inner insulation layer 103, and is then guided to the drainage pipe 601 for discharge. Since the lower heat storage body 3 and the upper heat storage body 2 are arranged alternately, the rinsing water only acts on the upper heat storage body 2 that has participated in the combustion and decomposition of exhaust gas. The lower heat storage body 3, which is not in direct contact with the combustion chamber, can avoid the impact of water rinsing and effectively extend its service life. At the same time, the conveying pipes arranged on both sides of the outer shell 1 are isolated from the rinsing area space and are not affected by water accumulation. After the rinsing operation is completed, the maintenance observation port 105 can be used to observe the residual silica powder on the surface of the concrete inner insulation layer 103. If necessary, a high-pressure water gun can be inserted a second time to perform surface rinsing to prevent the silica powder from adhering to the surface of the concrete inner insulation layer 103 and drying, which would cause secondary pollution to the lower heat storage body 3 and the conveying components, and ensure the long-term operational stability of the system.

[0022] Through the above steps, the upper heat storage body 2 divides the interior of the outer shell 1 into two independent functional areas: a combustion decomposition chamber 101 and a silicon powder cleaning chamber 102. This provides a dedicated channel and space for the collection and cleaning of silicon powder. Since the lower heat storage body 3 and the upper heat storage body 2 are arranged alternately, the flushing water only acts on the upper heat storage body 2 that has participated in the combustion decomposition of the exhaust gas. The lower heat storage body 3, which does not directly contact the combustion chamber, can avoid the influence of water flushing, effectively extending its service life. At the same time, the conveying pipes arranged on both sides of the outer shell 1 are isolated from the flushing area space and are not affected by water accumulation. This solves the problem that when cleaning silicon powder, the flushing water flow can easily erode the inner insulation layer structure of the ceramic fiber material inside the outer shell 1, and water accumulation can easily corrode the air inlet and outlet pipes, shortening the service life of key RTO components, causing a surge in maintenance costs and a decrease in operational reliability.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A heat storage structure for easy washing of silicon powder, comprising an outer shell (1) with a ceramic fiber inner insulation layer on the inner wall, characterized in that: It also includes an upper heat storage body (2) and a lower heat storage body (3) set inside the outer shell (1). The two are arranged in an alternating manner. The upper heat storage body (2) divides the interior of the outer shell (1) into two independent functional areas: a combustion decomposition chamber (101) and a silicon powder cleaning chamber (102). A concrete inner insulation layer (103) with an inclined upper end is fixedly installed inside the outer shell (1). The concrete inner insulation layer (103) is located directly below the upper heat storage body (2). A maintenance manhole (104) and a maintenance observation port (105) are provided on the side wall of the outer shell (1). The maintenance manhole (104) is connected to the combustion decomposition chamber (101), and the maintenance observation port (105) is connected to the silicon powder cleaning chamber (102). A drainage component is provided at the lower end of the concrete inner insulation layer (103), and conveying components are provided on both sides of the outer shell (1).

2. The heat storage structure for easy silicon powder washing according to claim 1, characterized in that: A high-temperature resistant steel grating plate (201) is fixedly installed inside the outer shell (1), and the high-temperature resistant steel grating plate (201) is located below the upper heat storage body (2).

3. The heat storage structure for easy silicon powder washing according to claim 1, characterized in that: The lower end of the outer shell (1) is connected to a connecting air duct (4), which is located at the lower end of the lower heat storage body (3).

4. The heat storage structure for easy silicon powder washing according to claim 3, characterized in that: The conveying assembly includes a lift valve (501) and a conveying duct (502). The lift valve (501) is connected to one end of the connecting duct (4), and the conveying duct (502) is connected to the lower end of the lift valve (501).

5. The heat storage structure for easy silicon powder washing according to claim 1, characterized in that: The drainage assembly includes a drainage pipe (601) that runs through the lower end of the outer shell (1). The inlet of the drainage pipe (601) is located at the bottom of the slope of the inclined concrete inner insulation layer (103). A valve (602) is provided around the drainage pipe (601).

6. The heat storage structure for easy silicon powder washing according to claim 1, characterized in that: Both the inspection manhole (104) and the maintenance observation port (105) are fitted with a set of sealing covers (7) by bolts.

7. The heat storage structure for easy silicon powder washing according to claim 6, characterized in that: A heat insulation layer (701) is provided on one side of the sealing cover (7), and a handle (702) is fixedly installed on the other side of the sealing cover (7).

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