Silicon carbide production flue gas treatment device

Abstract

The utility model relates to the technical field of silicon carbide production, and particularly discloses a silicon carbide production flue gas treatment device which comprises a reaction cylinder for treating silicon carbide production flue gas, a first pipe connected with the reaction cylinder and used for receiving flue gas, and a second pipe connected with the reaction cylinder and used for exhausting, a tail gas combustion treatment assembly is arranged at the free end of the second pipe; the device comprises a reaction cylinder, the top of the reaction cylinder is communicated with a spraying assembly used for achieving spraying cooling, the bottom of the reaction cylinder is provided with a cooling water collecting assembly, and the cooling water collecting assembly is communicated with the spraying assembly. Therefore, the flue gas emission cannot reach the standard, and the emission efficiency becomes low.

Description

Technical Field

[0001] The present application relates to the technical field of silicon carbide production, and specifically discloses a silicon carbide production flue gas treatment device. Background Art

[0002] Silicon carbide products have special features such as high temperature resistance, wear resistance, thermal shock resistance, chemical corrosion resistance, radiation resistance, and excellent electrical and thermal conductivity, so they are widely used in various sectors of the national economy. In my country, green silicon carbide is mainly used as an abrasive. Black silicon carbide is used to make abrasive tools, mostly for cutting and grinding materials with low tensile strength, such as glass, ceramics, stone and refractory materials, and is also used for grinding cast iron parts and non-ferrous metal materials;

[0003] Silicon carbide is a non-metallic carbide composed of silicon and carbon elements bonded by covalent bonds. Its hardness is second only to diamond and boron carbide. The chemical formula is SiC. It is a colorless crystal, and its surface is blue-black when it is oxidized or contains impurities. Silicon carbide variants with diamond structure are commonly known as corundum. The hardness of corundum is close to that of diamond, and it has good thermal stability. At 2127℃, it transforms from β-silicon carbide to α-silicon carbide, and α-silicon carbide remains stable at 2400℃. It is stable to aqueous hydrofluoric acid and concentrated sulfuric acid, but not to a mixture of concentrated hydrofluoric acid and nitric acid or phosphoric acid. It is decomposed by molten alkali in the air. It is divided into synthetic silicon carbide and natural silicon carbide. Natural silicon carbide is called moissanite, which is mainly found in kimberlite and volcanic amphibolite, but its amount is very small and has no mining value. Therefore, most of the silicon carbide currently is synthetic silicon carbide;

[0004] Synthetic silicon carbide can be made by high-temperature smelting of quartz sand, petroleum coke (or coal coke) (or anthracite), sawdust (salt is needed to produce green silicon carbide) and other raw materials. Under high temperature in an electric furnace, carbon is allowed to participate in the reaction to generate silicon carbide, carbon monoxide, SO2, NOx, etc.;

[0005] Moreover, the above gases are accompanied by high temperatures. If they need to be discharged reasonably, they need to be cooled first, and secondly, SO2, NOx and carbon monoxide need to be treated;

[0006] Since the temperature brought about by the above reaction is very high, the cooling effect of the cooling water will drop significantly. When the cooling water effect decreases, the emission will not meet the standard. Therefore, the inventors have invented a silicon carbide production flue gas treatment device. Utility Model Content

[0007] The utility model aims to solve the problem that the water circulation system in the traditional silicon carbide production flue gas treatment device cannot quickly cool the cooling water, thereby causing the flue gas emission to fail to meet the standard and thus causing the emission efficiency to become low.

[0008] In order to achieve the above object, the utility model provides the following basic solutions:

[0009] A silicon carbide production fume treatment device, comprising a reaction tube for treating silicon carbide production fume, a first tube connected to the reaction tube for receiving the fume, and a second tube connected to the reaction tube for exhausting gas;

[0010] The free end of the second tube is provided with an exhaust gas combustion treatment assembly;

[0011] The top of the reaction cylinder is connected to a spray assembly for achieving spray cooling, and the bottom of the reaction cylinder is provided with a cooling water collecting assembly, which is connected to the spray assembly.

[0012] The principles and effects of this basic solution are:

[0013] 1. Compared with the prior art, this device has a simple structure and an ingenious design. This device is designed with an exhaust gas combustion treatment component to treat carbon monoxide that is insoluble in water. By igniting carbon monoxide, carbon dioxide is formed, thereby achieving non-toxic emissions.

[0014] 2. Compared with the prior art, the device is provided with a spray assembly. The water sprayed by the spray assembly is mist, which covers the entire area and can effectively combine with the high-temperature gas to achieve cooling of the high-temperature gas. The combination of mist water and high-temperature gas is better than directly inserting the high-temperature gas into the water body, and thus the gas cooling effect will be better.

[0015] 3. Compared with the existing technology, this device adopts water cooling. Water cooling is not only simple in technology, but also produces SO2 and NOx for the flue gas produced by silicon carbide. SO2 and NOx are usually soluble in water. Therefore, water cooling can effectively remove SO2 and NOx in the flue gas, thereby achieving the emission of flue gas to meet the specified standards.

[0016] 4. Compared with the prior art, this device is equipped with a more excellent spray assembly. Considering that a large amount of water vapor will be generated and the water vapor will rise, improvements are made to the spray assembly to cool the water vapor and the water flowing out for the first time, thereby ensuring the use effect of the cooling water. This solves the problem that the water circulation system in the traditional silicon carbide production flue gas treatment device cannot quickly cool down the cooling water, which leads to the flue gas emission not meeting the standard, and then leads to low emission efficiency.

[0017] 5. Compared with the prior art, in order to further quickly cool down the cooling water, the device is also designed with a cooling water collection component, which can directly cool the hot water, so that the water circulation system can quickly cool down the cooling water and ensure the use effect of the cooling water.

[0018] Furthermore, the exhaust gas combustion treatment component includes a water absorption component and a combustion component connected to the water absorption component, the water absorption component includes a water absorption mounting cylinder detachably connected to the second tube, a mounting bracket detachably connected to the water absorption mounting cylinder, and a water-absorbing and breathable sponge mounted on the mounting bracket, the combustion component includes a combustion shell connected to the water absorption mounting cylinder and a plurality of combustion nozzles connected to the combustion shell, and the exhaust carbon monoxide gas is ignited through the combustion nozzle and then released into the atmosphere.

[0019] Furthermore, a gas one-way valve is provided on the first tube, and the size of the first tube is larger than that of the second tube. The first tube accelerates the gas inflow, and the second tube slows down the gas outflow speed.

[0020] Furthermore, the spray assembly includes a plurality of evenly arranged mounting holes opened on the top of the reaction cylinder, a mounting plate with a cavity, a plurality of spray heads connected to the mounting plate and whose positions correspond one-to-one to the mounting holes, and a water inlet pipe arranged on a side of the mounting plate away from the spray heads and connected to the mounting plate.

[0021] Furthermore, the spray head is inserted into the mounting hole and connected to the reaction cylinder, and a sealing gasket is provided at the connection between the spray head and the mounting hole to enhance the connection sealing effect of the spray head.

[0022] Furthermore, the spray head includes a head pipe connected to the mounting plate, a booster pump arranged on the head pipe, and a tail pipe arranged at the output end of the booster pump, wherein the tail pipe is a spray pipe, and a first cooling plate is arranged on the inner wall of the tail pipe, wherein the heating surface of the first cooling plate is arranged away from the center of the tail pipe, and the cooling surface of the first cooling plate is arranged close to the center of the tail pipe. The water vapor and the first outflowing water are cooled, thereby ensuring the use effect of the cooling water.

[0023] Furthermore, the cooling water collection assembly includes a water tank support connected to the reaction cylinder, a plurality of outflow pipes connected to the reaction cylinder, and a connecting pipe for connecting the outflow pipes in series, wherein the connecting pipe is connected to the water tank support, and also includes a water flow lifting assembly, through which the water in the water tank support enters the water inlet pipe to achieve cooling of the cooling water.

[0024] Furthermore, the water flow lifting assembly includes a first series pipe, a second series pipe and a lifting pump, the lifting pump is connected to the first series pipe and the second series pipe, the first series pipe is connected to the water tank support, and the second series pipe is connected to the water inlet pipe, so as to realize the recycling of cooling water.

[0025] Furthermore, the inner wall of the water tank support is provided with a second cooling plate, and the cooling surface of the second cooling plate is placed inside the water tank support. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a silicon carbide production flue gas treatment device proposed in an embodiment of the present application is shown;

[0028] Figure 2 A schematic structural diagram of a water absorption component in a silicon carbide production flue gas treatment device proposed in an embodiment of the present application is shown;

[0029] Figure 3 A front view of a silicon carbide production fume treatment device proposed in an embodiment of the present application is shown;

[0030] Figure 4 A schematic structural diagram of a spray assembly in a silicon carbide production flue gas treatment device proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0032] The figure marks in the drawings of the specification include: water tank bracket 1, reaction tube 2, second tube 3, first tube 4, gas one-way valve 5, water absorption mounting tube 6, combustion shell 7, combustion nozzle 8, water inlet pipe 9, water absorption and breathable sponge 10, mounting bracket 11, pull ring 12, outflow pipe 13, connecting pipe 14, lifting pump 15, first series pipe 16, second series pipe 17, spray head 18, head pipe 1801, booster pump 1802, tail pipe 1803, first cooling plate 1804.

[0033] Implementation example Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown:

[0034] A silicon carbide production flue gas treatment device comprises a reaction tube 2 for treating silicon carbide production flue gas, a first tube 4 connected to the reaction tube 2 for receiving flue gas, and a second tube 3 connected to the reaction tube 2 for exhausting gas, wherein a gas one-way valve 5 is arranged on the first tube 4, and the size of the first tube 4 is larger than that of the second tube 3. The first tube 4 accelerates gas entry, and the second slows down gas outflow speed.

[0035] The free end of the second tube 3 is provided with an exhaust gas combustion treatment assembly;

[0036] About the exhaust gas combustion treatment component: the exhaust gas combustion treatment component includes a water absorption component and a combustion component connected to the water absorption component, the water absorption component includes a water absorption mounting cylinder 6 detachably connected to the second tube 3, a mounting bracket 11 detachably connected to the water absorption mounting cylinder 6 and a water-absorbing breathable sponge 10 mounted on the mounting bracket 11, the combustion component includes a combustion shell 7 connected to the water absorption mounting cylinder 6 and a plurality of combustion nozzles 8 connected to the combustion shell 7, and the exhaust carbon monoxide gas is ignited through the combustion nozzle 8 and then released into the atmosphere.

[0037] The mounting bracket 11 is provided with a pull ring 12 to facilitate replacement of the mounting bracket 11 and the water-absorbing and breathable sponge 10 located on the mounting bracket 11 .

[0038] The gas cooled by water is relatively humid, and needs to absorb water for normal ignition. Therefore, a water-absorbing and breathable sponge 10 is designed to make the carbon monoxide gas passing through the water-absorbing and breathable sponge 10 dry, thereby achieving normal ignition of the carbon monoxide gas.

[0039] The top of the reaction cylinder 2 is connected to a spray assembly for achieving spray cooling, and the bottom of the reaction cylinder 2 is provided with a cooling water collecting assembly, which is connected to the spray assembly.

[0040] Regarding the spray assembly: the spray assembly includes a plurality of evenly arranged mounting holes opened on the top of the reaction tube 2, a mounting plate with a cavity, a plurality of spray heads 18 connected to the mounting plate and corresponding to the mounting holes, and a water inlet pipe 9 arranged on a side of the mounting plate away from the spray heads 18 and connected to the mounting plate. The spray heads 18 are inserted into the mounting holes and connected to the reaction tube 2. A sealing gasket is provided at the connection between the spray heads 18 and the mounting holes to enhance the connection sealing effect of the spray heads 18.

[0041] About spray head 18: Figure 4 As shown, the spray head 18 includes a head pipe 1801 connected to the mounting plate, a booster pump 1802 arranged on the head pipe 1801, and a tail pipe 1803 arranged at the output end of the booster pump 1802. The tail pipe 1803 is a spray pipe, and the inner wall of the tail pipe 1803 is provided with a first cooling plate 1804. The heating surface of the first cooling plate 1804 is arranged away from the center of the tail pipe 1803, and the cooling surface of the first cooling plate 1804 is arranged close to the center of the tail pipe 1803. The water vapor and the first outflowing water are cooled, thereby ensuring the use effect of the cooling water.

[0042] The cooling water collection assembly includes a water tank support connected to the reaction tube 2, a plurality of outflow pipes 13 connected to the reaction tube 2, and a connecting pipe 14 for connecting the outflow pipes 13 in series, the connecting pipe 14 is connected to the water tank support, and also includes a water flow lifting assembly, through which the water in the water tank support enters the water inlet pipe 9. To achieve cooling of the cooling water, regarding the water tank support: the inner wall of the water tank support is provided with a second cooling plate, and the cooling surface of the second cooling plate is placed inside the water tank support.

[0043] The water flow lifting assembly includes a first series pipe 16, a second series pipe 17 and a lifting pump 15, the lifting pump 15 is connected to the first series pipe 16 and the second series pipe 17, the first series pipe 16 is connected to the water tank support, and the second series pipe 17 is connected to the water inlet pipe 9, so as to realize the recycling of cooling water.

[0044] Specific implementation process:

[0045] In the first step, the flue gas produced by silicon carbide enters the first tube 4, passes through the gas one-way valve 5 and enters the reaction tube 2. At this time, the booster pump 1802 and the lift pump 15 are started, and the water in the water tank support passes through the first series pipe 16 to the second series pipe 17, and finally enters the water inlet pipe 9. The booster pump 1802 pressurizes the water in the water inlet pipe 9, and sprays it out through the spray pipe. The water becomes mist and contacts with the high-temperature flue gas, thereby cooling the high-temperature flue gas. At this time, the flue gas dissolved in water is dissolved in water under the action of the water mist.

[0046] In the second step, as the temperature of the flue gas drops rapidly, the water temperature rises rapidly, generating water vapor, which moves upward, contacts the first cooling plate 1804, and rapidly cools down, falling back into the reaction tube 2, thereby cooling the flue gas;

[0047] In the third step, the high-temperature water returns to the water tank support due to gravity, and the second cooling plate inside the water tank support cools the high-temperature water. After cooling, the water flows through the water flow lifting component and enters the water inlet pipe 9 again to realize water circulation;

[0048] In the fourth step, since carbon monoxide is insoluble in water, an exhaust gas combustion treatment component is set up to dry the gas through a water absorbent and then ignite it at the combustion nozzle 8, so that the carbon monoxide becomes carbon dioxide, which can be finally discharged into the atmosphere or treated as carbon dioxide.

[0049] The device solves the problem that the water circulation system in the traditional silicon carbide production flue gas treatment device cannot cool the cooling water, which leads to the flue gas emission failing to meet the standard and thus leads to low emission efficiency.

[0050] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A silicon carbide production flue gas treatment device, characterized in that: It includes a reaction tube for treating silicon carbide production fume, a first tube connected to the reaction tube for receiving the fume, and a second tube connected to the reaction tube for exhausting the gas; The free end of the second tube is provided with an exhaust gas combustion treatment assembly; The top of the reaction cylinder is connected to a spray assembly for achieving spray cooling, and the bottom of the reaction cylinder is provided with a cooling water collection assembly, which is connected to the spray assembly; The exhaust gas combustion treatment component includes a water absorption component and a combustion component connected to the water absorption component, the water absorption component includes a water absorption mounting cylinder detachably connected to the second tube, a mounting bracket detachably connected to the water absorption mounting cylinder, and a water-absorbing breathable sponge mounted on the mounting bracket, the combustion component includes a combustion shell connected to the water absorption mounting cylinder and a plurality of combustion nozzles connected to the combustion shell, and the exhaust carbon monoxide gas is ignited through the combustion nozzles and then released into the atmosphere.

2. A silicon carbide production fume treatment device according to claim 1, characterized in that: A gas one-way valve is arranged on the first tube, and the size of the first tube is larger than that of the second tube.

3. The silicon carbide production flue gas treatment device according to claim 1, characterized in that: The spray assembly includes a plurality of evenly arranged mounting holes opened on the top of the reaction cylinder, a mounting plate with a cavity, a plurality of spray heads connected to the mounting plate and corresponding in position to the mounting holes, and a water inlet pipe arranged on a side of the mounting plate away from the spray heads and connected to the mounting plate.

4. A silicon carbide production flue gas treatment device according to claim 3, characterized in that: The spray head is inserted into the mounting hole and connected to the reaction cylinder, and a sealing gasket is provided at the connection between the spray head and the mounting hole.

5. A silicon carbide production fume treatment device according to claim 4, characterized in that: The spray head includes a head pipe connected to the mounting plate, a booster pump arranged on the head pipe and a tail pipe arranged at the output end of the booster pump, the tail pipe is a spray pipe, and the inner wall of the tail pipe is provided with a first cooling plate, the heating surface of the first cooling plate is arranged away from the center of the tail pipe, and the cooling surface of the first cooling plate is arranged close to the center of the tail pipe.

6. The silicon carbide production fume treatment device according to claim 5, characterized in that: The cooling water collecting assembly includes a water tank support for cooling water connected to the reaction cylinder, a plurality of outflow pipes connected to the reaction cylinder and a connecting pipe for connecting the outflow pipes in series, wherein the connecting pipe is connected to the water tank support and also includes a water flow lifting assembly, through which the water in the water tank support enters the water inlet pipe.

7. A silicon carbide production fume treatment device according to claim 6, characterized in that: The water flow lifting assembly includes a first series pipe, a second series pipe and a lifting pump, the lifting pump is connected to the first series pipe and the second series pipe, the first series pipe is connected to the water tank support, and the second series pipe is connected to the water inlet pipe.

8. The silicon carbide production fume treatment device according to claim 7, characterized in that: The inner wall of the water tank support is provided with a second cooling plate, and the cooling surface of the second cooling plate is placed inside the water tank support.

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