Carbon monoxide recovery system for silicon carbide production

Abstract

This utility model relates to the field of silicon carbide processing and discloses a CO tail gas recovery system in the silicon carbide production process, including: a settling chamber, a filter cartridge, and a scrubbing tower. A guide pipe is installed on the upper right side of the settling chamber; a gas collection mechanism to prevent condensate accumulation is provided above the settling chamber; the filter cartridge is installed below the guide pipe, and a dust collector bag is installed inside the filter cartridge, with a disassembly and assembly mechanism for easy replacement of the dust collector bag on the front side of the filter cartridge; a gas guide pipe is installed above the scrubbing tower, with its left end installed on the right side of the filter cartridge. The gas collection mechanism includes a gas collection hood, a collection tank, a drain outlet, and a guide channel, with the collection tank fixed to the lower left side of the gas collection hood. This CO tail gas recovery system in the silicon carbide production process, through its design and research of a negative pressure tail gas recovery system, achieves efficient capture, purification, and resource utilization of tail gas throughout the entire process, reducing particulate matter, SO₂, and NOx emissions by 90% and exhibiting excellent filtration performance.

Description

Technical Field

[0001] This utility model relates to the field of silicon carbide processing technology, specifically to a CO tail gas recovery system in the silicon carbide production process. Background Technology

[0002] Silicon carbide is a chemically stable material with high thermal conductivity and good wear resistance. It is commonly used in abrasives, ceramics, and semiconductor electronics. The high-calorific-value tail gas (containing more than 90% CO, H, and CH4) generated during the smelting process is mostly emitted through direct combustion, resulting in resource waste and environmental pollution (CO2 emissions reach 8-10 tons per ton of product). In order to achieve resource utilization, CO tail gas is recycled and treated. There are various CO tail gas recovery systems in the silicon carbide production process on the market. For example, the utility model patent with authorization announcement number CN217403171U discloses a silicon carbide smelting furnace tail gas recovery device, which relates to the field of silicon carbide smelting. This silicon carbide smelting furnace tail gas recovery device includes a smelting furnace body and activated carbon plates. A tail gas pipe is fixedly connected to the top of the smelting furnace body, and a recovery device shell is fixedly connected to the tail gas pipe. When in use, this silicon carbide smelting furnace tail gas recovery device allows for easy installation of activated carbon plates inside the recovery device shell. The activated carbon plates are used to filter and adsorb harmful particles from the tail gas discharged from the smelting furnace body and tail gas pipe, achieving the recovery of toxic substances. Furthermore, the activated carbon mounting bracket installed inside the recovery device shell is easy to install and remove, and the activated carbon plates mounted inside the mounting bracket are also easy to replace periodically, thus ensuring good performance of the activated carbon plates.

[0003] However, based on existing solutions and actual usage, the current CO tail gas recovery system in silicon carbide production processes leads to resource waste. The existing smelting furnace is a fully underground structure with a tail gas recovery rate of less than 30%, and the tail gas treatment effect is not good enough. Therefore, we propose a CO tail gas recovery system in silicon carbide production processes to solve the problems mentioned above. Utility Model Content

[0004] The purpose of this utility model is to provide a CO tail gas recovery system in the silicon carbide production process, so as to solve the problems mentioned in the background art that the current CO tail gas recovery system in the silicon carbide production process will cause resource waste, and the existing smelting furnace is a fully underground structure with a tail gas recovery rate of less than 30% and the tail gas treatment effect is not good enough.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a CO tail gas recovery system for silicon carbide production, comprising: A settling chamber, wherein a guide pipe is installed on the upper right side of the settling chamber; Also includes: A gas collection mechanism is installed above the settling chamber to prevent condensate accumulation. The filter cartridge is installed below the guide tube, and a dust collector bag is installed inside the filter cartridge. A disassembly and assembly mechanism for easy replacement of the dust collector bag is provided on the front side of the filter cartridge. A gas scrubbing tower is provided, with a gas guide pipe installed above it, and the left end of the gas guide pipe is installed on the right side of the filter cylinder.

[0006] Preferably, the gas collection mechanism includes a gas collection hood, a collection trough, a drain outlet, and a guide trough. The collection trough is fixed on the lower left side of the gas collection hood, and a drain outlet is installed below the collection trough. A guide trough is provided on the inner left end of the gas collection hood.

[0007] Preferably, the left end longitudinal section of the gas collection hood has an arc-shaped structure, the guide channel is inclined on the longitudinal section, and the guide channel is symmetrically arranged front and back.

[0008] Preferably, the filter cartridge and the dust collector bag are threaded together, and the filter cartridge and the inspection door are rotatably connected.

[0009] Preferably, the disassembly and assembly mechanism includes an inspection door, a first sealing strip, a second sealing strip, an installation rod, and a positioning cap. The first sealing strip is fixed on both the upper and lower sides of the inspection door, and the second sealing strip is fixed on the right side of the inspection door. The installation rod is connected to the internal slot of the inspection door, and the positioning cap is threaded to the rear end of the installation rod.

[0010] Preferably, both the first and second sealing strips are engaged with the filter cartridge, the filter cartridge and the mounting rod are connected by a slot, and the mounting rod is symmetrically arranged about the horizontal central axis of the filter cartridge.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the CO tail gas recovery system in the silicon carbide production process and the tail gas negative pressure recovery system design and research realize the efficient capture, purification and resource utilization of tail gas throughout the entire process, reduce particulate matter, SO2 and NOx emissions by 90%, and have good filtration effect; 1. Equipped with a settling chamber, dust collector bags, and a scrubbing tower, the exhaust gas is settled through the settling chamber. A filter cartridge is installed on the right side of the settling chamber, and a dust collector bag is installed inside the filter cartridge to filter the exhaust gas. A scrubbing tower is installed on the right side of the filter cartridge for further dust removal and cooling. The design and research of the exhaust gas negative pressure recovery system realizes efficient capture, purification, and resource utilization of exhaust gas throughout the entire process, reducing particulate matter, SO2, and NOx emissions by 90%. 2. It is equipped with an inspection door, a first sealing strip, and an installation rod. The inspection door is rotatably connected to the filter cartridge. Both the inspection door and the filter cartridge are connected to the mounting rod through a slot. By rotating the positioning cap connected to the threaded end of the mounting rod, the mounting rod can be removed. Then, the inspection door can be rotated to remove the dust collector bag for replacement. The filtration effect is good. 3. It is equipped with a gas collection hood, a collection tank, and a guide channel. The collection tank is fixed at the bottom of the gas collection hood, and the guide channel fixed inside the gas collection hood guides the condensate on the inner wall of the gas collection hood. The condensate is collected in the collection tank, which is convenient for centralized cleaning and avoids water accumulation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure connecting the drain outlet and the guide channel of this utility model; Figure 3 This is a schematic diagram of the overall structure connecting the filter cartridge and the inspection door of this utility model; Figure 4 This is a schematic diagram of the overall structure connecting the filter cartridge and dust collector bag of this utility model.

[0013] In the diagram: 1. Settling chamber; 2. Gas collection hood; 3. Collection tank; 4. Drain outlet; 5. Guide channel; 6. Guide pipe; 7. Filter cartridge; 8. Dust collector bag; 9. Inspection door; 10. First sealing strip; 11. Second sealing strip; 12. Mounting rod; 13. Positioning cap; 14. Gas guide pipe; 15. Gas scrubbing tower. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-4 The present invention provides a technical solution: a CO tail gas recovery system in the silicon carbide production process, including a settling chamber 1, a gas collection hood 2, a collection tank 3, a drain outlet 4, a guide channel 5, a guide pipe 6, a filter cartridge 7, a dust collector bag 8, an inspection door 9, a first sealing strip 10, a second sealing strip 11, a mounting rod 12, a positioning cap 13, a gas guide pipe 14, and a gas scrubbing tower 15; First, as attached Figure 1As shown, a gas collection mechanism is installed above the settling chamber 1 to prevent condensate accumulation. The gas collection mechanism is connected to the smelting furnace. The gas collection hood 2 guides the exhaust gas generated by the smelting furnace into the settling chamber 1, causing the particulate matter in the exhaust gas to settle to the bottom of the settling chamber 1 and then discharged separately. A guide pipe 6 is installed on the upper right side of the settling chamber 1, and a filter cylinder 7 is installed below the guide pipe 6. After settling, the exhaust gas is guided by the guide pipe 6 and enters the filter cylinder 7. A dust collector bag 8 is installed inside the filter cylinder 7. The dust collector bag 8 filters the exhaust gas. A disassembly and assembly mechanism for replacing the dust collector bag 8 is provided on the front side of the filter cylinder 7, which facilitates operation when the dust collector bag 8 needs to be replaced. A gas guide pipe 14 is installed on the lower right side of the filter cylinder 7, and a gas scrubbing tower 15 is installed at the right end of the gas guide pipe 14. The exhaust gas is guided by the gas guide pipe 14 and enters the gas scrubbing tower 15. The gas scrubbing tower 15 cools and removes dust from the exhaust gas, further reducing the particulate matter content in the exhaust gas. As attached Figure 1 and attached Figure 2 As shown, the gas collection mechanism includes a gas collection hood 2, a collection tank 3, a drain outlet 4, and a guide channel 5. The longitudinal section of the left end of the gas collection hood 2 is an arc-shaped structure to facilitate the guidance of exhaust gas. The condensate automatically slides to the bottom of the gas collection hood 2. The guide channel 5 is provided at the left end of the interior of the gas collection hood 2. The guide channel 5 is inclined on the longitudinal section and is symmetrically arranged at the front and back. The two guide channels 5 guide the condensate on the inner wall of the gas collection hood 2 to prevent the condensate from condensing at the bottom and causing water accumulation. The collection tank 3 is fixed on the lower left side of the gas collection hood 2. The guide channel 5 guides the condensate into the collection tank 3. The drain outlet 4 is installed below the collection tank 3. When it is necessary to clean the collection tank 3, the accumulated water can be discharged through the drain outlet 4. As attached Figure 1 Appendix Figure 3 and attached Figure 4As shown, the disassembly and assembly mechanism includes an inspection door 9, a first sealing strip 10, a second sealing strip 11, an installation rod 12, and a positioning cap 13. The installation rod 12 is connected to an internal slot in the inspection door 9, and the positioning cap 13 is threaded to the rear end of the installation rod 12. Rotating the positioning cap 13 disengages it from the installation rod 12. Then, the installation rod 12 is pulled out, disengaging it from the slot connection between the installation rod 12 and the filter cartridge 7 and the inspection door 9. The inspection door 9 is then pulled outwards. The first sealing strip 10 is fixed to both the upper and lower sides of the inspection door 9, and the second sealing strip 11 is fixed to the right side of the inspection door 9. Both the first sealing strip 10 and the second sealing strip 11 are connected to the filter cartridge 7. The filter cylinder 7 is engaged, disengaging the first sealing strip 10 and the second sealing strip 11 from the access door 9. The dust collector bag 8 can then be installed inside the filter cylinder 7, with its upper end threadedly connected to the filter cylinder 7 to secure it. The access door 9 is then closed, engaging the first sealing strip 10 and the second sealing strip 11 with the filter cylinder 7 to ensure a tight seal. The mounting rod 12 is then connected to the slots of the filter cylinder 7 and the access door 9. Finally, the positioning cap 13 is threadedly connected to the mounting rod 12, securing the filter cylinder 7 and the access door 9. The mounting rod 12 is symmetrically positioned about the horizontal centerline of the filter cylinder 7 to ensure stability.

[0016] This is the entire working process of the CO tail gas recovery system in the silicon carbide production process. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0017] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0018] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CO tail gas recovery system for silicon carbide production, including: Settling chamber (1), with a guide pipe (6) installed on the upper right side of the settling chamber (1); Its characteristic is that it further includes: A gas collection mechanism is provided above the settling chamber (1) to prevent condensate accumulation; The filter cartridge (7) is installed below the guide tube (6), and a dust collector bag (8) is installed inside the filter cartridge (7). A disassembly and assembly mechanism for easy replacement of the dust collector bag (8) is provided on the front side of the filter cartridge (7). A gas scrubbing tower (15) is provided with a gas guide pipe (14) installed above it, and the left end of the gas guide pipe (14) is installed on the right side of the filter cylinder (7).

2. The CO off-gas recovery system in a silicon carbide production process according to claim 1, characterized by: The gas collection mechanism includes a gas collection hood (2), a collection trough (3), a drain outlet (4) and a guide trough (5). The collection trough (3) is fixed on the lower left side of the gas collection hood (2), and the drain outlet (4) is installed below the collection trough (3). The guide trough (5) is provided on the inner left end of the gas collection hood (2).

3. The CO off-gas recovery system in a silicon carbide production process according to claim 2, characterized by: The left end longitudinal section of the gas collection hood (2) is an arc-shaped structure, and the guide channel (5) is inclined on the longitudinal section and is symmetrically arranged front and back.

4. The CO off-gas recovery system in a silicon carbide production process according to claim 1, characterized by: The filter cartridge (7) and the dust collector bag (8) are threaded together, and the filter cartridge (7) and the inspection door (9) are rotatably connected.

5. The system for recovering CO off-gas in a silicon carbide production process according to claim 1, characterized by: The disassembly and assembly mechanism includes an inspection door (9), a first sealing strip (10), a second sealing strip (11), an installation rod (12), and a positioning cap (13). The first sealing strip (10) is fixed on both the upper and lower sides of the inspection door (9), and the second sealing strip (11) is fixed on the right side of the inspection door (9). The installation rod (12) is connected to the internal slot of the inspection door (9), and the positioning cap (13) is threaded to the rear end of the installation rod (12).

6. The CO off-gas recovery system in a silicon carbide production process according to claim 5, characterized by: The first sealing strip (10) and the second sealing strip (11) are both engaged with the filter cylinder (7), and the filter cylinder (7) and the mounting rod (12) are connected by a slot, and the mounting rod (12) is symmetrically arranged about the horizontal central axis of the filter cylinder (7).

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