A waste gas treatment system for silicon carbide rod sintering

Abstract

This invention provides a waste gas treatment system for silicon carbide rod sintering, comprising: an air pump connected to a silicon carbide rod sintering furnace for discharging waste gas from the furnace; and a filter tower, wherein the bottom of the filter tower contains filtrate, an inlet is provided below the surface of the filtrate on the filter tower, and a gas outlet is provided at the top of the filter tower. The inlet is connected to an air inlet pipe, the end of the air inlet pipe away from the inlet being at least as high as the surface of the filtrate in the filter tower, and the end of the air inlet pipe away from the inlet being connected to the air pump. This configuration allows for the filtration of waste gas, reducing or even preventing the release of volatile tar into the air, thus ensuring the quality of the discharged gas.

Description

Technical Field

[0001] This invention generally relates to the field of silicon carbide rod processing and manufacturing technology, and specifically to a waste gas treatment system for silicon carbide rod sintering. Background Technology

[0002] The manufacturing process of silicon carbide rods involves processes such as blank preparation and sintering. During blank preparation, asphalt, tar, and resin are added to the raw materials as binders to facilitate the extrusion molding of the blanks. During high-temperature sintering, the binders such as asphalt and tar will volatilize at high temperatures. Therefore, the exhaust gas emitted during sintering will have the smell of asphalt and tar. Directly releasing the exhaust gas into the atmosphere will pollute the atmosphere and affect the air quality of the factory area. Summary of the Invention

[0003] In view of the above problems, this application provides a waste gas treatment system for silicon carbide rod sintering, which is used to treat the waste gas generated by the silicon carbide rod sintering furnace, and can effectively filter pollutants in the waste gas to ensure the quality of the discharged gas.

[0004] This invention provides a waste gas treatment system for silicon carbide rod sintering, comprising:

[0005] An air pump, connected to the silicon carbide rod sintering furnace, is used to discharge the waste gas inside the silicon carbide rod sintering furnace.

[0006] A filter tower has a filtrate at its bottom, an inlet located below the surface of the filtrate, and a gas outlet at its top. The inlet is connected to an air inlet pipe, the end of which is not lower than the surface of the filtrate in the filter tower, and the end of which is connected to an air pump.

[0007] Furthermore, a second outlet is provided on the side wall of the filter tower. The second outlet is higher than the liquid level of the filtrate. The second outlet is connected to a collection chamber, and a control valve is provided between the second outlet and the collection chamber.

[0008] Furthermore, the inlet is located at the bottom of the filter tower, and an annular flange extends inward on the inner circumferential surface of the filter tower. An annular vent plate is provided on one side of the annular flange. An annular limiting member is detachably and fixedly connected to the side of the filter tower away from the annular flange on the side of the annular vent plate. An annular elastic member is provided between the outer circumferential surface of the annular vent plate and the inner circumferential surface of the filter tower. A high-frequency vibration sound generating device is provided on the outer wall of the filter tower. The high-frequency vibration sound generating device is connected to the annular vent plate through a transmission rod. The high-frequency vibration sound generating device can drive the annular vent plate to vibrate at high frequency in the horizontal direction.

[0009] Furthermore, a valve body is vertically guided inside the filter tower. The valve body has a closed position that blocks and closes the gas outlet and an open position that opens the gas outlet. A float is floating on the surface of the filtered liquid inside the filter tower. The valve body is connected to the float via a rigid rod. When the liquid level inside the filter tower is not higher than the lowest point of the second outlet, the valve body is in the open position. When the height of the liquid level inside the filter tower increases, the valve body can be driven from the open position to the closed position under the buoyancy of the float.

[0010] Furthermore, the control valve is an electrically controlled valve, which is configured to switch from a closed state to an open state when the valve body is in the closed position, and to remain in the open state for a predetermined time t before switching to the closed position.

[0011] Furthermore, the filter tower has a cylindrical structure, the top of the filter tower is sealed, the gas outlet is a plurality of through holes provided on the upper end side wall of the filter tower, and the valve body is a sleeve that is guided and slidably disposed inside the filter tower. The sleeve is provided with valve holes that correspond one-to-one with the plurality of through holes. When the valve holes and the through holes are connected one-to-one, the valve body is in the open position. When the valve holes and the through holes are staggered, the valve body is in the closed position.

[0012] Furthermore, the lower end of the sleeve is connected to a second vent plate. The inner wall of the filter tower is provided with a first limiting surface and a second limiting surface at intervals on both sides of the second vent plate. When the second vent plate is in contact with the upper surface of the second vent plate, the valve body is in the closed position. When the lower surface of the second vent plate is in contact with the second limiting surface, the valve body is in the open position.

[0013] Furthermore, a first permanent magnet is provided on the second limiting surface, and the first permanent magnet magnetically engages with the second ventilated plate.

[0014] Furthermore, at least two floating elements are provided, and the at least two floating elements are evenly spaced around the axis of the filter tower.

[0015] Furthermore, it also includes a replenishment chamber. The filter tower has an inflow hole on its side wall below the liquid level of the filtrate, which communicates with the replenishment chamber. The replenishment chamber is used to replenish the filtrate into the filter tower when the valve body changes from the closed position to the open position.

[0016] Beneficial effects

[0017] This invention provides a waste gas treatment system for silicon carbide rod sintering, comprising:

[0018] An air pump, connected to the silicon carbide rod sintering furnace, is used to discharge the waste gas inside the silicon carbide rod sintering furnace.

[0019] A filter tower has a filtrate at its bottom, an inlet located below the filtrate surface, and a gas outlet at its top. The inlet is connected to an air inlet pipe, with the end of the air inlet pipe furthest from the inlet at least the height of the filtrate surface within the filter tower. This end of the air inlet pipe is also connected to an air pump. This configuration effectively filters exhaust gas, reducing or even preventing the release of volatile tar into the air, thus ensuring the quality of the discharged gas. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of a filter tower in a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0023] Figure 3 This is a schematic diagram of the top structure of the filter tower in a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0024] Figure 4 This is a schematic diagram of the bottom structure of a filter tower in a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0025] Figure 5 for Figure 3 The diagram shown is a partially enlarged structural schematic of point A in a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0026] Figure 6 for Figure 4 The diagram shown is a partially enlarged structural schematic of point B in a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0027] Figure 7 for Figure 4 The diagram shown is a partially enlarged structural schematic of point C in a waste gas treatment system for silicon carbide rod sintering provided by the present invention.

[0028] Figure 8 for Figure 4 The diagram shown is a partially enlarged structural schematic of point D in a waste gas treatment system for silicon carbide rod sintering provided by the present invention. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] This invention provides a waste gas treatment system for silicon carbide rod sintering. As a specific embodiment, refer to... Figure 1 , Figure 2 The initiation and processing system includes: an air pump 1, connected to a silicon carbide rod sintering furnace, used to discharge waste gas from the silicon carbide rod sintering furnace; and a filter tower 2, the bottom of which contains filtrate, an inlet 21 located below the surface of the filtrate, a gas outlet 22 located at the top of the filter tower, an inlet 21 connected to an air inlet pipe 210, the end of the air inlet pipe 210 away from the inlet 21 being higher than the surface of the filtrate in the filter tower, and the end of the air inlet pipe 210 away from the inlet 21 being connected to the air pump.

[0033] For details, please refer to Figure 1 In use, the filter tower is vertically oriented, with filtrate filling the bottom. The filtrate can be clean water. Air pump 1 is connected to the exhaust outlet of the silicon carbide rod sintering furnace, and the other end is connected to the filter tower inlet 21 via an inlet pipe 210. The inlet 21 is positioned below the filtrate level. The air pump pumps waste gas into the filter tower. After passing through the filtrate inlet 21, the waste gas is cooled and filtered by the clean water, and the gas is discharged from the top exhaust outlet 22. The tar remains in the cleaning liquid and floats on the surface of the filtrate. This configuration effectively filters the waste gas, reducing or even preventing the release of tar volatiles into the air, ensuring the quality of the discharged gas. Positioning the end of the inlet pipe 210 away from the inlet above the filtrate level prevents backflow.

[0034] Furthermore, as a preferred embodiment, a second outlet 23 is provided on the side wall of the filter tower 2. The second outlet 23 is not lower than the liquid level of the filtrate. The second outlet 23 is connected to a collection chamber 3, and a control valve 31 is provided between the second outlet 23 and the collection chamber 3.

[0035] For details, please refer to Figure 2The filter tower has a second outlet 23 on its side wall. When the filter liquid is placed in the filter tower, the liquid level of the filter liquid is made to be level with or slightly lower than the lowest point of the second outlet 23. Generally, the distance between the liquid level and the lowest point of the second outlet 23 is 3 to 5 centimeters. When the exhaust gas treatment system is working normally, the control valve 31 is closed. The tar volatiles in the gas are filtered by the filter liquid inside the filter tower and float on the surface of the filter liquid. As more and more tar accumulates, the tar level also rises. When the tar level reaches a certain height, the control valve 31 is opened, and the tar accumulated on the surface of the filter liquid can be discharged from the second outlet. The tar is collected in the collection chamber 3. After all the tar is discharged, the control valve 31 is closed. The closing of the control valve 31 can be controlled by the filtration time. For example, the control valve 31 can be opened after the exhaust gas treatment system has been working for a predetermined time to discharge the tar. The control valve can be a manual control valve or an electric control valve.

[0036] It should be noted that, in some embodiments, in order to ensure the liquid level of the filtrate, a transparent window (not shown in the figure) is provided on the side wall of the filter tower at the liquid level of the filtrate. A camera (not shown in the figure) is provided at the transparent window, and a liquid supply device (not shown in the figure) is connected to the side wall of the filter tower. The liquid level is obtained by acquiring images of the liquid level of the filtrate by the camera, thereby controlling the operation of the liquid supply device and ensuring that the liquid level of the filtrate is within a constant range.

[0037] Furthermore, as a preferred embodiment, refer to Figure 2 , Figure 4 , Figure 8 The inlet 21 is located at the bottom of the filter tower. An annular flange 201 extends inward on the inner circumferential surface of the filter tower. A circular air vent plate 202 is provided on one side of the annular flange. An annular limiting member 203 is detachably and fixedly connected to the side of the filter tower away from the annular flange on the side of the annular air vent plate. An annular elastic member 204 is provided between the outer circumferential surface of the annular air vent plate and the inner circumferential surface of the filter tower. A high-frequency vibration generator 205 is provided on the outer wall of the filter tower. The high-frequency vibration generator 205 is connected to the circular air vent plate 202 through a transmission rod. The high-frequency vibration generator 205 can drive the circular air vent plate 202 to vibrate at high frequency in the horizontal direction.

[0038] Specifically, the filter tower includes Figure 3 The tower top shown and Figure 4The tower base shown includes a tower base 2a and an intermediate section 2b connected to the tower base via a flange. An annular flange 201 is provided on the inner wall of the lower end of the intermediate section. A circular vent plate 202 is provided below the annular flange 201. An annular elastic element 204 is sleeved around the circular vent plate. The annular elastic element can be made of elastic materials such as silicone or rubber. An annular limiting element 203 is provided below the circular vent plate 202 and is threadedly connected to the inner circumferential surface of the intermediate section. A high-frequency vibration generator is fixedly installed on the outer wall of the intermediate section. It transmits the high-frequency vibration generated by the high-frequency vibrator to the circular vent plate 202 via a transmission rod 2051, thereby causing the circular vent plate to vibrate at high frequency along the axial direction of the transmission rod 2051. With this configuration, after the exhaust gas enters the filter tower through inlet 21, it floats to the surface through the vents on the circular permeable plate. The gas is then diverted through multiple vents on the circular permeable plate, increasing the contact area between the gas and the filtrate. Simultaneously, the circular permeable plate generates high-frequency vibration. The vibrating plate impacts the air at high frequency, dispersing the gas into finer bubbles, further increasing the contact area between the gas and the filtrate. This allows the filtrate to better remove impurities from the exhaust gas, improving the treatment effect. The high-frequency vibration generator can be a piezoelectric transducer. Its working principle is that when a high-frequency voltage is applied to the piezoelectric element, it can generate high-frequency deformation, thereby producing high-frequency vibration to drive the circular permeable plate to vibrate at high frequency.

[0039] Example 2

[0040] This invention provides a waste gas treatment system for silicon carbide rod sintering. As a specific embodiment, its difference from Embodiment 1 lies in that, as a further improvement, refer to... Figure 3 A valve body 24 is vertically guided inside the filter tower. The valve body 24 has a closed position that blocks and closes the gas outlet 22 and an open position that opens the gas outlet 22. A float 242 floats on the surface of the filtered liquid inside the filter tower. The valve body 24 is connected to the float 242 through a rigid rod 241. When the liquid level in the filter tower is not higher than the lowest point of the second outlet 23, the valve body 24 is in the open position. When the height of the liquid level in the filter tower increases, the valve body can be driven from the open position to the closed position under the buoyancy of the float 242.

[0041] Specifically, it is understood that because tar has a certain viscosity, its flow rate is relatively slow when it is discharged. Therefore, the discharge rate through the second outlet is also relatively slow. As a preferred embodiment, refer to... Figure 2 , Figure 3A valve body 24 is vertically guided at the top of the tower, and a float 242 is installed on the surface of the filtrate. A rigid rod 241 connects the valve body 24 and the float 242. With this configuration, when there is no floating tar or the amount of tar on the surface of the filtrate is small, the liquid level in the filtration tower is lower than or level with the lowest point of the second outlet 23. At this time, the valve body 24 is in the open position for the gas outlet 22. As the waste gas is filtered, more and more tar accumulates on the surface of the filtrate, gradually submerging the second outlet 23. Therefore, the tar exerts buoyancy on the float, pushing it upwards, which in turn pushes the valve body 24 upwards, closing the outlet. After the gas outlet 22 is closed by the valve body, the gas inside the filter tower cannot be discharged, and the gas pressure inside the filter tower increases. At this time, an air pressure sensor (not shown in the figure) can be installed on the filter tower. When the gas pressure inside the filter tower increases, the control valve 31 is opened. Since the pressure inside the filter tower is high at this time, after the control valve 31 is opened, the tar can be quickly discharged from the second outlet 23 under the action of the gas pressure, thereby increasing the discharge speed of the tar. After the tar is discharged, the tar liquid level drops, and the floating part moves down under the action of gravity, thereby causing the valve body to reopen. At this time, the gas inside the internal gas filter tower is discharged from the gas outlet 22 again, reducing the gas pressure inside the filter tower. Then the control valve can be closed.

[0042] Furthermore, as a preferred embodiment, the control valve 31 is an electrically controlled valve. The control valve is configured to switch from a closed state to an open state when the control valve 24 is in the closed position, and to remain in the open state for a predetermined time t before switching to the closed position. By setting the control valve as an electrically controlled valve, the opening and closing can be automatically controlled according to the internal air pressure of the filter tower, thereby improving the degree of automation. It is understood that when the tar level decreases and the valve body opens, there may still be tar on the surface of the filtrate. In order to ensure the cleaning effect of tar, the opening state of the control valve is controlled by controlling the duration of the valve body opening after the control valve opens, thereby extending the opening time of the control valve and thus allowing the tar to be discharged more thoroughly.

[0043] Furthermore, as a preferred embodiment, refer to Figure 2 , Figure 4 In the middle area of ​​the middle section 2b, an expansion section is formed by expanding outward, and the bottom surface of the expansion section is inclined downward from the inside to the outside. The second outlet 23 is located on the periphery of the expansion section. With this arrangement, when tar is discharged, the tar can be guided through the bottom surface of the expansion section, which is more conducive to the discharge of tar.

[0044] Furthermore, as a specific implementation method, refer to Figure 2 , Figure 3The tower top includes a third section 2c connected to the middle section via a flange. The filter tower 2 has a cylindrical structure, and the top of the filter tower 2 is sealed. The gas outlet 22 consists of multiple through holes on the upper side wall of the filter tower. The valve body 24 is a sleeve 24a that is guided and slidably disposed within the filter tower. The sleeve 24a has valve holes 24b that correspond one-to-one with the multiple through holes. When the valve holes 24b are in communication with the through holes, the valve body 24 is in the open position. When the valve holes 24b are staggered with the through holes, the valve body is in the closed position.

[0045] Furthermore, as a specific implementation method, refer to Figure 3 The lower end of the sleeve 24a is connected to a second vent plate 243. The inner sidewall of the filter tower 2 is provided with a first limiting surface 206 and a second limiting surface 207 on both sides of the second vent plate 243 at intervals. When the second vent plate 243 is in contact with the upper surface of the second vent plate 243, the valve body 24 is in the closed position. When the lower surface of the second vent plate 243 is in contact with the second limiting surface 207, the valve body 24 is in the open position.

[0046] For details, please refer to Figure 3 At the lower end of the third segment 2c, a second expansion segment is provided, in which the first limiting surface 206 is the upper end surface of the second expansion segment. The outer peripheral surface of the second ventilated plate slides and guides the inner peripheral surface of the second expansion segment. Below the second ventilated plate, a limiting ring 2071 is detachably and fixedly provided on the second expansion segment. The second limiting surface 207 is the upper surface of the limiting ring 2071. (Refer to...) Figure 2 The rigid rod is detachably and fixedly connected to the second permeable plate. When there is little or no tar floating above the surface of the filtrate, the second permeable plate contacts the second limiting surface under the action of gravity. At this time, the valve hole 24b on the sleeve 24a is connected to multiple through holes on the outer side wall of the upper end of the filter tower, and is in the open state. Gas can be discharged through the valve hole and the gas outlet 22. (Refer to...) Figure 2At this point, the lowest point of the float is lower than the lowest point of the second outlet, and part of the float is inside the filtrate. The buoyancy received by the float is less than or equal to the total weight of the float, sleeve 24a, and rigid rod. With this setting, the sleeve can be kept in the open state by the limit of the second limiting surface. As more and more tar accumulates on the upper surface of the filtrate, the tar level rises, and the buoyancy on the float increases until the buoyancy of the float equals the total weight of the float, sleeve 24a, and rigid rod. As the tar level continues to rise, it can push the sleeve 24a to rise until the upper surface of the second vent plate contacts the first limiting surface. At this point, the gas outlet 22 is completely blocked, and the gas inside the filter tower cannot be discharged. At this point, the gas pressure inside the filter tower increases, the control valve opens, and the tar begins to be discharged.

[0047] Understandably, since the tar level rises slowly, the casing 24a also rises slowly. When the gas outlet 22 is partially blocked, the gas discharge from the filter tower is not smooth, and the gas pressure inside the filter tower will gradually increase. Therefore, it is possible that the control valve opens before the second gas outlet is completely blocked. Because the second gas outlet is not completely blocked, some of the gas pressure inside the filter tower will be discharged from the partially blocked gas outlet 22 after the control valve opens. The rapid gas release will reduce the tar discharge rate. When the control valve closes after a predetermined time t, the tar may not have been completely discharged. To solve the above problems, as a preferred embodiment, refer to... Figure 3 , Figure 5A first permanent magnet is provided on the second limiting surface 207. The first permanent magnet is magnetically attracted to the second vent plate 243. With this arrangement, as the amount of tar on the surface of the filtrate increases, the buoyancy of the float increases. When the buoyancy of the float is equal to the total weight Mg of the floating component, the sleeve 24a, and the rigid rod, the tar level is at the first height. Due to the magnetic attraction between the second vent plate and the second limiting surface, the sleeve 24a will not move as the tar level continues to rise. At this time, the gas in the filter tower can flow smoothly out from the gas outlet 22. The magnetic force between the second vent plate and the second limiting surface is set to be greater than 1.5Mg and less than 3Mg. As the tar level continues to rise, the buoyancy of the floating component continues to increase. The second height is reached, where the difference between the second height and the first height is greater than or equal to (L1-L2), where L1 is the distance from the first surface to the second limiting surface, and L2 is the distance between the upper and lower surfaces of the second vent plate that limit the engagement with the first and second limiting surfaces. When the tar level reaches the second height, the buoyancy of the floating component is equal to the sum of the magnetic attraction between the second vent plate and the second limiting surface and Mg. Then, as the tar level continues to rise, the buoyancy of the floating component can push the second vent plate to separate from the second limiting surface. The distance between the first permanent magnet and the second limiting surface becomes farther, and the magnetic attraction decreases. Therefore, under the buoyancy of the floating component, the sleeve 24a moves upward rapidly, the upper surface of the second vent plate contacts the first limiting surface, the gas outlet is blocked, and the gas pressure in the filter tower rises rapidly. Then, the control valve opens for a predetermined time t to discharge the tar.

[0048] Furthermore, as a preferred embodiment, at least two floating elements 242 are provided, and the at least two floating elements 242 are evenly spaced around the axis of the filter tower 2. This arrangement balances the thrust provided by the floating elements to the second ventilator plate, thus preventing the sleeve 24a from getting stuck.

[0049] As a specific implementation method, refer to Figure 5 A second permanent magnet is provided on the second limiting surface to magnetically engage with the first permanent magnet, thereby achieving magnetic engagement between the second vent plate and the second limiting surface.

[0050] Furthermore, in order to better remove tar, as a preferred embodiment, refer to... Figure 4 , Figure 6 It also includes a replenishment chamber 5. The filter tower has an inflow hole 51 on its side wall below the liquid level of the filtrate, which communicates with the replenishment chamber 5. The replenishment chamber 5 is used to replenish the filtrate into the filter tower when the valve body changes from the closed position to the open position.

[0051] Specifically, the structure of the fluid replenishment chamber includes an annular rigid cavity 5a located at the upper end of the second segment 2b and coaxially arranged with the second segment. An annular end cap 5e is provided at the upper end of the rigid cavity. The third segment 2c is detachably and fixedly connected to the upper end cap. A first connecting airway 5a-1 communicating with the atmosphere is provided at the upper end of the rigid cavity. An annular plate 5b is provided inside the rigid cavity, with its side surface slidingly sealing against the side surface of the rigid cavity. Multiple drive rods 5c are provided on the upper surface of the annular plate, evenly spaced around the axis of the rigid cavity. Each drive rod is surrounded by a compression spring 5d, with both ends of the spring abutting against the annular end cap and the annular plate, respectively. A first infusion tube 53 and a second infusion tube 510 are connected to the bottom of the rigid cavity. The second infusion tube 510 is connected to an inlet hole 51. The first infusion tube 53 is connected to a filter liquid source 52. Referring to Figure 6, a first one-way valve plate 531, allowing the flowing medium to flow unidirectionally into the rigid cavity, is provided at one end of the first infusion tube 53 connected to the rigid cavity. Figure 7 The inlet 51 is equipped with a second one-way valve plate 5101 that allows the flowing medium to flow into the filter tower in one direction. (Continue to refer to...) Figure 2 , Figure 3 , Figure 6A piston cylinder 540 is provided on the annular end cap 5e, corresponding to the drive rod 5c. The piston cylinder and the drive rod 5c are coaxially arranged, and the drive rod 5c is parallel to the axis of the rigid cavity. A piston plate 542 is provided inside the piston cylinder. Multiple first connecting vents 5410 are provided on the side wall of the filter tower above the liquid surface of the filtrate, corresponding to the multiple piston cylinders. A second connecting vent 5411 is provided on the side wall of each piston cylinder 540 below the piston plate. The first connecting vents are connected to the second connecting vents of the piston cylinder through a vent pipe 541. The upper end of the piston cylinder is provided with a connection to the atmosphere. The second connecting air passage 5401, through this arrangement, allows for the following: During normal filtration operation of the filter tower, when the gas outlet 22 is unobstructed, the internal air pressure of the filter tower is low, resulting in a low pressure difference with the atmosphere. Consequently, the pressure difference across the piston plate 542 is too low to pull the annular plate. When the gas outlet 22 is obstructed, the air pump 1 continuously operates, causing the air pressure inside the filter tower to rise rapidly. This results in a sharp increase in the pressure difference across the piston plate 542. Under the influence of this pressure difference, the piston plate 542 is pushed upwards, thereby pulling the annular plate 5b via the drive rod 5c, thus squeezing... As the annular plate moves upward, the compression spring 5d reduces the pressure in the area below the annular plate within the rigid cavity. At this time, the first one-way valve plate 531 opens, and the second one-way valve plate 5101 closes. This allows the filtrate from the liquid source 52 to be drawn into the rigid cavity. Simultaneously, the control valve 31 opens, discharging the tar from the filter tower and lowering the liquid level. The sleeve 24a falls, reopening the gas outlet 22, thus reducing the gas pressure inside the filter tower. This reduces the pressure difference across the piston plate 542, causing the annular plate 5b to move downward under the force of the compression spring, thus drawing the filtrate from the rigid cavity into the filter tower. The liquid is squeezed into the filter tower. At this time, the control valve is kept open. As liquid is added to the filter tower, the liquid level of the filtrate in the filter tower rises, causing the tar floating on the surface of the filtrate to rise and be discharged from the second outlet 23. Some of the filtrate also flows out from the second outlet 23. Since the exhaust gas discharged from the sintering furnace through the air pump 1 is at a high temperature, the filtrate has a certain temperature. Therefore, when the filtrate is discharged from the second outlet, it can also have the effect of flushing the second outlet, washing away the tar adhering to the second outlet, and avoiding the problem of blockage of the second outlet due to tar accumulation.

[0052] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A waste gas treatment system for silicon carbide rod sintering, characterized in that, include: An air pump, connected to the silicon carbide rod sintering furnace, is used to discharge the waste gas inside the silicon carbide rod sintering furnace. A filter tower, wherein the bottom of the filter tower contains filtrate, an inlet is provided on the filter tower below the surface of the filtrate, a gas outlet is provided on the top of the filter tower, the inlet is connected to an air inlet pipe, the end of the air inlet pipe away from the inlet is higher than the surface of the filtrate in the filter tower, and the end of the air inlet pipe away from the inlet is connected to an air pump. A second outlet is provided on the side wall of the filter tower, and the height of the second outlet is not lower than the liquid level of the filtrate. A valve body is vertically guided inside the filter tower. The valve body has a closed position to block and close the gas outlet and an open position to open the gas outlet. A float is floating on the surface of the filtrate inside the filter tower. The valve body is connected to the float via a rigid rod. When the liquid level inside the filter tower is not higher than the lowest point of the second outlet, the valve body is in the open position. When the liquid level inside the filter tower rises, the valve body can be driven from the open position to the closed position under the buoyancy of the float. The filter tower includes a top and a bottom. The bottom includes the base and an intermediate section connected to the base via a flange. The top includes a third section connected to the intermediate section via a flange. It also includes a replenishment chamber. The filter tower has an inflow hole on its side wall below the liquid level of the filtrate, which communicates with the replenishment chamber. The replenishment chamber is used to replenish the filtrate into the filter tower when the valve body changes from the closed position to the open position. The replenishment chamber includes an annular rigid chamber located at the upper end of the middle section and coaxially arranged with the middle section. An annular end cap is provided at the upper end of the rigid chamber. The third section is detachably and fixedly connected to the annular end cap. A first connecting air passage communicating with the atmosphere is provided at the upper end of the rigid chamber. An annular plate is provided inside the rigid chamber. The side of the annular plate is slidably sealed with the side of the rigid chamber. Multiple drive rods are provided on the upper surface of the annular plate. The multiple drive rods are evenly spaced around the axis of the rigid chamber. A compression spring is sleeved around each drive rod. The two ends of the compression spring abut against the annular end cap and the annular plate, respectively. A first infusion pipe and a second infusion pipe are connected to the bottom of the rigid chamber. The second infusion pipe is connected to the inlet hole. The first infusion pipe is connected to the source of the filter liquid. A first one-way valve that allows the flowing medium to flow into the rigid chamber in one direction is provided at the end of the first infusion pipe connected to the rigid chamber. A second one-way valve plate that allows the flowing medium to flow into the filter tower in one direction is provided at the inlet hole. A piston cylinder is provided on the annular end cap, corresponding to the drive rod. The piston cylinder and the drive rod are coaxially arranged, and the drive rod is parallel to the axis of the rigid cavity. A piston plate is provided inside the piston cylinder. Multiple first connecting air holes are provided on the side wall of the filter tower above the liquid surface of the filtrate, corresponding to the multiple piston cylinders. A second connecting air hole is provided on the side wall of each piston cylinder below the piston plate. The first connecting air holes are connected to the second connecting air holes of the piston cylinder through air pipes. A second connecting air passage is provided at the upper end of the piston cylinder, which is connected to the atmosphere.

2. The waste gas treatment system for silicon carbide rod sintering according to claim 1, characterized in that, The second outlet is connected to a collection chamber, and a control valve is provided between the second outlet and the collection chamber.

3. The waste gas treatment system for silicon carbide rod sintering according to claim 2, characterized in that, The inlet is located at the bottom of the filter tower. An annular flange extends inward on the inner circumferential surface of the filter tower. An annular vent plate is provided on one side of the annular flange. An annular limiting member is detachably and fixedly connected to the side of the filter tower away from the annular flange on the side of the annular vent plate. An annular elastic member is provided between the outer circumferential surface of the annular vent plate and the inner circumferential surface of the filter tower. A high-frequency vibration sound generating device is provided on the outer wall of the filter tower. The high-frequency vibration sound generating device is connected to the annular vent plate through a transmission rod. The high-frequency vibration sound generating device can drive the annular vent plate to vibrate at high frequency in the horizontal direction.

4. The waste gas treatment system for silicon carbide rod sintering according to claim 2, characterized in that, The control valve is an electrically controlled valve, which is configured to switch from a closed state to an open state when the valve body is in the closed position, and to remain in the open state for a predetermined time t before switching to the closed position.

5. The waste gas treatment system for silicon carbide rod sintering according to claim 4, characterized in that, The filter tower has a cylindrical structure, and the top of the filter tower is sealed. The gas outlet is a plurality of through holes provided on the upper side wall of the filter tower. The valve body is slidably disposed in a sleeve inside the filter tower. The sleeve is provided with valve holes that correspond one-to-one with the plurality of through holes. When the valve holes and the through holes are connected one-to-one, the valve body is in the open position. When the valve holes and the through holes are staggered, the valve body is in the closed position.

6. The waste gas treatment system for silicon carbide rod sintering according to claim 5, characterized in that, The lower end of the sleeve is connected to a second vent plate. The inner sidewall of the filter tower is provided with a first limiting surface and a second limiting surface at intervals on both sides of the second vent plate. When the first limiting surface is in contact with the upper surface of the second vent plate, the valve body is in the closed position. When the lower surface of the second vent plate is in contact with the second limiting surface, the valve body is in the open position.

7. The waste gas treatment system for silicon carbide rod sintering according to claim 6, characterized in that, A first permanent magnet is provided on the second limiting surface, and the first permanent magnet is magnetically attracted to the second ventilated plate.

8. The waste gas treatment system for silicon carbide rod sintering according to claim 7, characterized in that, At least two floating elements are provided, and the at least two floating elements are evenly spaced around the axis of the filter tower.

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