Tar-containing waste gas treatment device and treatment method

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a tar-containing waste gas treatment device and method.The treatment device comprises a spraying module, a cyclone separation module and a precipitation separation module, and the spraying module comprises a spraying outer barrel, a spraying inner barrel arranged in the spraying outer barrel and a gas inlet pipe arranged in the inner barrel; the spraying mechanism is arranged on the spraying outer barrel; the precipitation separation module comprises a precipitation tank, an overflow tank communicated with the precipitation tank, a sewage recovery pipe connected with the overflow tank, and a cleaning mechanism arranged at the tops of the precipitation tank and the overflow tank. The spraying module and the cyclone separation module can carry out secondary tar separation on tar-containing waste gas under the cooperation of sprayed water mist, a mixture of tar and water generated after separation treatment enters the precipitation separation module, finally, tar is precipitated and separated from water and then independently collected, waste water without tar is discharged, and the tar-containing waste gas is recycled. The treatment efficiency of the tar-containing waste gas is ensured, and the tar is prevented from blocking the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a treatment device and a treatment method for tar-containing waste gas. Background Art

[0002] In industrial manufacturing, waste gas is often generated in the process of producing products in industries such as chemical, steel, oil refining, circuit boards, leather, plastics, painting, and printing. These waste gases directly discharged into the atmosphere will cause pollution, especially organic waste gas, which not only affects the environment, but also seriously endangers human health. Therefore, the waste gas needs to be treated before it is discharged. In different industries, due to the different products produced, the composition of the waste gas generated is also quite different, so it is necessary to carry out corresponding treatment for waste gas with different components. In some production operations, tar will be produced and mixed in the waste gas. Since tar appears as a viscous liquid under normal temperature and pressure, most of the waste gas containing tar is high-temperature waste gas. Most of the waste gas containing tar is high-temperature waste gas, so the waste gas needs to be cooled during the treatment process. At present, when treating the waste gas containing tar, most of them adopt the water washing method, that is, the waste gas is passed into the water tank before the waste gas is discharged, and the tar in the waste gas is separated through the water body. The waste water generated by this treatment method contains tar, which is difficult to transport, easy to clog the pipeline, and difficult to clean, which increases the difficulty of subsequent maintenance. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a treatment device for tar-containing waste gas, and a method for treating tar-containing waste gas using the above treatment device.

[0004] The present invention is implemented by the following scheme: A device for treating tar-containing waste gas, comprising: A spray module, the spray module comprising a spray outer cylinder, a spray inner cylinder arranged in the spray outer cylinder, an air inlet pipe arranged in the inner cylinder, and a spray mechanism arranged on the spray outer cylinder, the inner cylinder and the outer cylinder are connected, the exhaust gas enters from the air inlet pipe and flows out from the spray outer cylinder after passing through the spray inner cylinder and the spray outer cylinder, and the spray mechanism covers the flow path of the exhaust gas from the upper side; A cyclone separation module connected to the spray module, the cyclone separation module comprising a cyclone separation cylinder, an ejector connected to the side wall of the cyclone separation cylinder, and the ejector connected to the spray outer cylinder of the spray module; A sedimentation separation module is connected to the cyclone separation module, and the sedimentation separation module includes a sedimentation tank, an overflow tank connected to the sedimentation tank, a sewage recovery pipe connected to the overflow tank, and a cleaning mechanism arranged on the top of the sedimentation tank and the overflow tank.

[0005] Furthermore, the top of the spray inner cylinder is an open end, and there is a gap between the top of the spray inner cylinder and the inner top of the spray outer cylinder, between the top of the air inlet pipe and the inner top of the spray outer cylinder, and the inner top of the spray outer cylinder is connected to a guide wall, and the guide wall is located between the inner wall of the spray inner cylinder and the outer wall of the air inlet pipe, and there is a gap between the bottom of the guide wall and the bottom of the spray inner cylinder. After the exhaust gas enters from the bottom of the air inlet pipe, it passes in sequence between the guide wall and the outer wall of the air inlet pipe, between the guide wall and the inner wall of the spray inner cylinder, between the inner wall of the spray outer cylinder and the inner wall of the spray inner cylinder, and finally flows out from the spray outer cylinder.

[0006] Furthermore, the spray outer cylinder, the spray inner cylinder, the guide wall, and the position where the air intake pipe contacts the exhaust gas are all provided with an anti-adhesion coating.

[0007] Furthermore, a ventilation pipe is connected to the bottom of the air intake pipe, and the ventilation pipe is connected to an air guide pipe for introducing exhaust gas.

[0008] Furthermore, the air intake pipe includes an inner liner and an outer shell, a hollow portion is provided between the inner liner and the outer shell, and a heat-conducting medium is filled in the hollow portion.

[0009] Furthermore, the cyclone separation module includes a spray cleaning mechanism arranged in the cyclone separation barrel, the spray cleaning mechanism includes a cyclone plate, a spray assembly arranged above the cyclone plate, and a cleaning assembly arranged below the cyclone plate, and the connection position between the ejector and the cyclone separation barrel is located below the cyclone plate.

[0010] Furthermore, the sedimentation separation module includes a collecting barrel arranged below the sedimentation tank, a slag discharge port is arranged at the bottom of the spray inner cylinder, and the slag discharge port is connected to the collecting barrel; an anti-adhesion filter is arranged between the sedimentation tank and the overflow tank.

[0011] The present invention also provides a method for treating tar-containing waste gas, which uses the aforementioned tar-containing waste gas treatment device and is characterized in that the tar-containing waste gas is introduced into the air inlet pipe of the spray module, and the waste gas flows through the air inlet pipe, the spray inner cylinder and the spray outer cylinder in sequence. During the flow of the waste gas in the spray module, the spray mechanism sprays water mist to separate the tar from the waste gas, and the waste gas leaves the spray outer cylinder and enters the cyclone separation cylinder. The waste gas is mixed with water mist in the cyclone separation cylinder and spirally moves along the cylinder wall to separate the tar in the waste gas again. Thereafter, the waste gas passes through the cyclone separation cylinder and the spray assembly at the top of the cyclone separation cylinder to separate the tar for the last time. After the tar is separated for the last time, the waste gas flows out of the cyclone separation cylinder.

[0012] Furthermore, after the spray mechanism sprays water mist to separate the tar from the exhaust gas, the separated tar is discharged from the bottom of the spray inner cylinder and flows into the collection barrel; the tar and water mist separated in the cyclone separation cylinder form a mixed liquid, which enters the sedimentation tank for sedimentation. After sedimentation, the tar is discharged from the bottom of the sedimentation tank to the collection barrel.

[0013] Furthermore, when the waste gas containing tar is introduced into the air inlet pipe of the spray module, fresh air is introduced to mix with the waste gas to cool the waste gas.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a spray module and a cyclone separation module, and with the cooperation of the sprayed water mist, the tar-containing waste gas can be subjected to secondary tar separation, and the mixture of tar and water produced after the separation treatment enters the sedimentation separation module, and finally the tar is precipitated and separated from the water and then collected separately, and the waste water without tar is discharged, which not only ensures the treatment efficiency of the tar-containing waste gas, but also avoids the tar from clogging the pipeline, and facilitates the subsequent cleaning and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a treatment device for tar-containing waste gas provided by the present invention.

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0017] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0018] Included in the picture are: Spray module 1, spray outer cylinder 11, spray inner cylinder 12, air inlet pipe 13, lining 131, outer shell 132, spray mechanism 14, guide wall 15, ventilation pipe 16, air guide pipe 17, slag discharge port 18, cyclone separation module 2, cyclone separation cylinder 21, ejector 22, spray cleaning mechanism 23, cyclone plate 231, spray assembly 232, sedimentation separation module 3, sedimentation tank 31, overflow tank 32, sewage recovery pipe 33, cleaning mechanism 34, collection barrel 35, anti-adhesion filter 36. DETAILED DESCRIPTION

[0019] To facilitate those skilled in the art to understand the present invention, the present invention will be further described in detail below in conjunction with specific embodiments and drawings.

[0020] Example 1 Reference Figures 1 to 3 The present invention provides a treatment device for tar-containing waste gas, which includes a spray module 1, a cyclone separation module 2, and a sedimentation separation module 3.

[0021] Among them, the spray module 1 includes a spray outer cylinder 11, a spray inner cylinder 12 arranged in the spray outer cylinder 11, an air intake pipe 13 arranged in the inner cylinder, and a spray mechanism 14 arranged on the spray outer cylinder 11. The inner cylinder and the outer cylinder are connected. After the exhaust gas enters from the air intake pipe 13, it passes through the spray inner cylinder 12 and the spray outer cylinder 11 and then flows out from the spray outer cylinder 11. The spray mechanism 14 covers the flow path of the exhaust gas from the upper side.

[0022] The cyclone separation module 2 is connected to the spray module 1, and the cyclone separation module 2 includes a cyclone separation cylinder 21, an ejector 22 connected to the side wall of the cyclone separation cylinder 21, and the ejector 22 is connected to the spray outer cylinder 11 of the spray module 1. After the exhaust gas passes through the spray module 1, it will be mixed with water, and the residual tar and other impurities of the exhaust gas will make it difficult to use the fan as a power source. Therefore, an ejector 22 is required to promote the flow of the exhaust gas. In this embodiment, the ejector 22 adopts a Venturi ejector 22.

[0023] The sedimentation separation module 3 is connected to the cyclone separation module 2, and the sedimentation separation module 3 includes a sedimentation tank 31, an overflow tank 32 connected to the sedimentation tank 31, a sewage recovery pipe 33 connected to the overflow tank 32, and a cleaning mechanism 34 arranged on the top of the sedimentation tank 31 and the overflow tank 32.

[0024] The top of the spray inner cylinder 12 is an open end, and there is a gap between the top of the spray inner cylinder 12 and the inner top of the spray outer cylinder 11. Between the top of the air inlet pipe 13 and the inner top of the spray outer cylinder 11, the inner top of the spray outer cylinder 11 is connected with a guide wall 15, and the guide wall 15 is located between the inner wall of the spray inner cylinder 12 and the outer wall of the air inlet pipe 13, and there is a gap between the bottom of the guide wall 15 and the bottom of the spray inner cylinder 12. In this embodiment, the guide wall 15 is tubular as a whole, and the guide wall 15 forms a flow path between the air inlet pipe 13 and the inner spray cylinder. After the exhaust gas enters from the bottom of the air inlet pipe 13, it passes through the guide wall 15 and the outer wall of the air inlet pipe 13, the guide wall 15 and the inner wall of the spray inner cylinder 12, and the inner wall of the spray outer cylinder 11 and the outer wall of the spray inner cylinder 12, and finally flows out from the spray outer cylinder 11. From the attached Figure 1From the perspective of the exhaust gas, after entering from the middle air inlet pipe 13, it flows to the top of the spray outer cylinder 11, then flows from the middle to the side, enters the channel between the air inlet pipe 13 and the guide wall 15, and flows downward to the bottom of the inner spray cylinder. After reaching the bottom of the inner spray cylinder, the exhaust gas flows upward again, passes through the channel between the guide wall 15 and the inner spray cylinder, and then enters from the top of the outer spray cylinder into the space between the outer wall of the inner spray cylinder and the inner wall of the outer spray cylinder. Finally, the exhaust gas flows out of the outer spray cylinder from the bottom of the outer spray cylinder. With this structure, most of the tar is liquefied and separated from the exhaust gas after being cooled by spraying, and is quickly discharged from the bottom of the inner spray cylinder.

[0025] The spray outer cylinder 11, the spray inner cylinder 12, the guide wall 15, and the position where the air intake pipe 13 contacts the exhaust gas are all provided with an anti-adhesion coating. The physical property of tar is that it has super strong viscosity. It is gaseous above 350°C and gradually turns into liquid below 350°C. The anti-adhesion coating will not be adhered by the tar, so that the tar will not remain on the inner wall of the above structure. In this embodiment, the anti-adhesion coating can be made of polytetrafluoroethylene material.

[0026] The cyclone separation module 2 includes a spray cleaning mechanism 23 arranged in the cyclone separation cylinder 21, and the spray cleaning mechanism 23 includes a cyclone plate 231, a spray assembly 232 arranged above the cyclone plate 231, and a cleaning assembly arranged below the cyclone plate 231. The connection position between the ejector 22 and the cyclone separation cylinder 21 is located below the cyclone plate 231. After the tar in the exhaust gas is separated by the spray module 1, a part of it will remain. In addition, there are some other impurities in the exhaust gas. Under the action of the ejector 22, the exhaust gas enters the cyclone separation cylinder 21 and performs spiral motion. Cyclone separation is a process of separating particulate pollutants from gas by using the centrifugal force generated by rotation. When the exhaust gas enters the seven-selection separation cylinder, the airflow changes from linear motion to circular motion, and most of the rotating airflow spirals downward along the wall and the cylinder and flows toward the cone, which is usually called external cyclone flow. The dust-laden gas generates centrifugal force during the rotation process, which throws particles with a density greater than that of the gas toward the wall of the device. Once the particles come into contact with the wall, they lose their inertial force and fall along the wall by the momentum of the inlet velocity and the downward gravity, entering the bottom of the cyclone separation cylinder 21. When the rotating and descending external cyclone airflow reaches the bottom, it moves closer to the center of the dust collector due to the contraction of the cone, and its tangential velocity continues to increase. When the airflow reaches a certain position at the lower end of the vertebral body, it swirls upward from the bottom in the cyclone dust collector in the same direction of rotation, continuing to make spiral motion, and the rising exhaust gas contacts the cyclone plate 231 again. The spray assembly 232 sprays water mist on the cyclone plate 231 at the same time, and further separates the tar by the cyclone process. Finally, the exhaust gas with tar removed is discharged from the exhaust port at the top of the cyclone separation cylinder 21 and flows to the exhaust gas treatment equipment. In this embodiment, an anti-sticking layer can also be set inside the cyclone separation cylinder 21.

[0027] The sedimentation separation module 3 also includes a collection barrel 35 arranged below the sedimentation tank 31, and a slag discharge port 18 is arranged at the bottom of the spray inner cylinder 12, and the slag discharge port 18 is connected to the collection barrel 35; an anti-adhesion filter 36 is arranged between the sedimentation tank 31 and the overflow tank 32. After the water and tar mixture discharged from the cyclone separation cylinder 21 flows into the sedimentation tank 31, the tar is precipitated to the bottom of the sedimentation tank 31, while the water is located in the upper layer. At the same time, the water body will also enter the separation tank through the middle anti-adhesion filter 36. After the liquid level is higher than the overflow port, the wastewater flows out from the drain pipe and enters the sewage recovery pipe 33. A drain port is also arranged at the bottom of the separation tank. In addition, the sedimentation tank 31 needs to be cleaned regularly. When cleaning, the valve at the bottom of the cyclone separation cylinder 21 needs to be closed. The cleaning mechanism has a nozzle that can spray water into the sedimentation tank 31 to rinse the inside of the sedimentation tank 31 and the filter.

[0028] Although this embodiment can separate tar from exhaust gas, the high temperature of the exhaust gas can easily damage the internal anti-adhesion coating, or even cause the anti-adhesion coating to lose its function. To solve this problem, Embodiment 2 is further proposed.

[0029] Example 2 Reference Figures 1 to 3 The present invention provides a treatment device for tar-containing waste gas, which includes a spray module 1, a cyclone separation module 2, and a sedimentation separation module 3.

[0030] Among them, the spray module 1 includes a spray outer cylinder 11, a spray inner cylinder 12 arranged in the spray outer cylinder 11, an air intake pipe 13 arranged in the inner cylinder, and a spray mechanism 14 arranged on the spray outer cylinder 11. The inner cylinder and the outer cylinder are connected. After the exhaust gas enters from the air intake pipe 13, it passes through the spray inner cylinder 12 and the spray outer cylinder 11 and then flows out from the spray outer cylinder 11. The spray mechanism 14 covers the flow path of the exhaust gas from the upper side.

[0031] The cyclone separation module 2 is connected to the spray module 1, and the cyclone separation module 2 includes a cyclone separation cylinder 21, an ejector 22 connected to the side wall of the cyclone separation cylinder 21, and the ejector 22 is connected to the spray outer cylinder 11 of the spray module 1. After the exhaust gas passes through the spray module 1, it will be mixed with water, and the residual tar and other impurities of the exhaust gas will make it difficult to use the fan as a power source. Therefore, an ejector 22 is required to promote the flow of the exhaust gas. In this embodiment, the ejector 22 adopts a Venturi ejector 22.

[0032] The sedimentation separation module 3 is connected to the cyclone separation module 2, and the sedimentation separation module 3 includes a sedimentation tank 31, an overflow tank 32 connected to the sedimentation tank 31, a sewage recovery pipe 33 connected to the overflow tank 32, and a cleaning mechanism 34 arranged on the top of the sedimentation tank 31 and the overflow tank 32.

[0033] The top of the spray inner cylinder 12 is an open end, and there is a gap between the top of the spray inner cylinder 12 and the inner top of the spray outer cylinder 11. Between the top of the air inlet pipe 13 and the inner top of the spray outer cylinder 11, the inner top of the spray outer cylinder 11 is connected with a guide wall 15, and the guide wall 15 is located between the inner wall of the spray inner cylinder 12 and the outer wall of the air inlet pipe 13, and there is a gap between the bottom of the guide wall 15 and the bottom of the spray inner cylinder 12. In this embodiment, the guide wall 15 is tubular as a whole, and the guide wall 15 forms a flow path between the air inlet pipe 13 and the inner spray cylinder. After the exhaust gas enters from the bottom of the air inlet pipe 13, it passes through the guide wall 15 and the outer wall of the air inlet pipe 13, the guide wall 15 and the inner wall of the spray inner cylinder 12, and the inner wall of the spray outer cylinder 11 and the outer wall of the spray inner cylinder 12, and finally flows out from the spray outer cylinder 11. From the attached Figure 1 From the perspective of the exhaust gas, after entering from the middle air inlet pipe 13, it flows to the top of the spray outer cylinder 11, then flows from the middle to the side, enters the channel between the air inlet pipe 13 and the guide wall 15, and flows downward to the bottom of the inner spray cylinder. After reaching the bottom of the inner spray cylinder, the exhaust gas flows upward again, passes through the channel between the guide wall 15 and the inner spray cylinder, and then enters from the top of the outer spray cylinder into the space between the outer wall of the inner spray cylinder and the inner wall of the outer spray cylinder. Finally, the exhaust gas flows out of the outer spray cylinder from the bottom of the outer spray cylinder. With this structure, most of the tar is liquefied and separated from the exhaust gas after being cooled by spraying, and is quickly discharged from the bottom of the inner spray cylinder.

[0034] The spray outer cylinder 11, the spray inner cylinder 12, the guide wall 15, and the position where the air intake pipe 13 contacts the exhaust gas are all provided with an anti-adhesion coating. The physical property of tar is that it has super strong viscosity. It is gaseous above 350°C and gradually turns into liquid below 350°C. The anti-adhesion coating will not be adhered by the tar, so that the tar will not remain on the inner wall of the above structure. In this embodiment, the anti-adhesion coating can be made of polytetrafluoroethylene material.

[0035] The intake pipe 13 includes an inner liner 131 and an outer shell 132. There is a hollow portion between the inner liner 131 and the outer shell 132, and the hollow portion is filled with a heat-conducting medium. The inner liner 131 is made of stainless steel, and the heat-conducting medium can be water. Of course, other heat-conducting media can also be selected in specific implementation. The initial temperature of the tar-containing exhaust gas reaches 400-700°C. This temperature range will damage the anti-adhesion coating. Therefore, filling the hollow portion with a heat-conducting medium can play a certain cooling role to protect the inner liner 131.

[0036] The cyclone separation module 2 includes a spray cleaning mechanism 23 arranged in the cyclone separation cylinder 21, and the spray cleaning mechanism 23 includes a cyclone plate 231, a spray assembly 232 arranged above the cyclone plate 231, and a cleaning assembly arranged below the cyclone plate 231. The connection position between the ejector 22 and the cyclone separation cylinder 21 is located below the cyclone plate 231. After the tar in the exhaust gas is separated by the spray module 1, a part of it will remain. In addition, there are some other impurities in the exhaust gas. Under the action of the ejector 22, the exhaust gas enters the cyclone separation cylinder 21 and performs spiral motion. Cyclone separation is a process of separating particulate pollutants from gas by using the centrifugal force generated by rotation. When the exhaust gas enters the seven-selection separation cylinder, the airflow changes from linear motion to circular motion, and most of the rotating airflow spirals downward along the wall and the cylinder and flows toward the cone, which is usually called external cyclone flow. The dust-laden gas generates centrifugal force during the rotation process, which throws particles with a density greater than that of the gas toward the wall of the device. Once the particles come into contact with the wall, they lose their inertial force and fall along the wall by the momentum of the inlet velocity and the downward gravity, entering the bottom of the cyclone separation cylinder 21. When the rotating and descending external cyclone airflow reaches the bottom, it moves closer to the center of the dust collector due to the contraction of the cone, and its tangential velocity continues to increase. When the airflow reaches a certain position at the lower end of the vertebral body, it swirls upward from the bottom in the cyclone dust collector in the same direction of rotation, continuing to make spiral motion, and the rising exhaust gas contacts the cyclone plate 231 again. The spray assembly 232 sprays water mist on the cyclone plate 231 at the same time, and further separates the tar by the cyclone process. Finally, the exhaust gas with tar removed is discharged from the exhaust port at the top of the cyclone separation cylinder 21 and flows to the exhaust gas treatment equipment. In this embodiment, an anti-sticking layer can also be set inside the cyclone separation cylinder 21.

[0037] The sedimentation separation module 3 also includes a collection barrel 35 arranged below the sedimentation tank 31, and a slag discharge port 18 is arranged at the bottom of the spray inner cylinder 12, and the slag discharge port 18 is connected to the collection barrel 35; an anti-adhesion filter 36 is arranged between the sedimentation tank 31 and the overflow tank 32. After the water and tar mixture discharged from the cyclone separation cylinder 21 flows into the sedimentation tank 31, the tar is precipitated to the bottom of the sedimentation tank 31, while the water is located in the upper layer. At the same time, the water body will also enter the separation tank through the middle anti-adhesion filter 36. After the liquid level is higher than the overflow port, the wastewater flows out from the drain pipe and enters the sewage recovery pipe 33. A drain port is also arranged at the bottom of the separation tank. In addition, the sedimentation tank 31 needs to be cleaned regularly. When cleaning, the valve at the bottom of the cyclone separation cylinder 21 needs to be closed. The cleaning mechanism has a nozzle that can spray water into the sedimentation tank 31 to rinse the inside of the sedimentation tank 31 and the filter.

[0038] The bottom of the air intake pipe 13 is connected to a vent pipe 16, and the vent pipe 16 is connected to an air guide pipe 17 for introducing exhaust gas. The vent pipe 16 is used to introduce external air and mix it with the exhaust gas that has just entered the air intake pipe 13 to reduce the temperature of the exhaust gas. After the exhaust gas is mixed with the external air, the overall temperature will drop rapidly. In combination with the heat-conducting medium of the air intake pipe 13, it can not only avoid damage to the internal anti-adhesion coating, but also speed up the process of tar liquefaction and improve the efficiency of tar separation. After the exhaust gas passes through the spray module 1, its temperature can be reduced to 100°C or below.

[0039] Example 3 The present invention also provides a method for treating tar-containing waste gas, which uses the aforementioned tar-containing waste gas treatment device and is characterized in that the tar-containing waste gas is introduced into the air inlet pipe of the spray module, and the waste gas flows through the air inlet pipe, the spray inner cylinder and the spray outer cylinder in sequence. During the flow of the waste gas in the spray module 1, the spray mechanism sprays water mist to separate the tar from the waste gas, and the waste gas leaves the spray outer cylinder and enters the cyclone separation cylinder. The waste gas is mixed with water mist in the cyclone separation cylinder and spirally moves along the cylinder wall to separate the tar in the waste gas again. Thereafter, the waste gas passes through the cyclone separation cylinder and the spray assembly at the top of the cyclone separation cylinder to separate the tar for the last time. After the tar is separated for the last time, the waste gas flows out of the cyclone separation cylinder and flows to the waste gas treatment equipment for centralized treatment.

[0040] After the spray mechanism sprays water mist to separate tar from the exhaust gas, the separated tar is discharged from the bottom of the spray inner cylinder and flows into the collection barrel; the tar and water mist separated in the cyclone separation cylinder form a mixed liquid and enter the sedimentation tank for sedimentation. After sedimentation, the tar is discharged from the bottom of the sedimentation tank to the collection barrel.

[0041] When the waste gas containing tar is passed into the air inlet pipe of the spray module, fresh air is introduced to mix with the waste gas at the same time to cool the waste gas. This can quickly reduce the waste gas temperature to the temperature point where the tar is liquefied, thereby accelerating the tar separation process.

[0042] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0043] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Although the present invention is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in the scope of the appended claims.

Claims

1. A treatment device for tar-containing waste gas, characterized in that: include: A spray module, the spray module comprising a spray outer cylinder, a spray inner cylinder arranged in the spray outer cylinder, an air inlet pipe arranged in the inner cylinder, and a spray mechanism arranged on the spray outer cylinder, the inner cylinder and the outer cylinder are connected, the exhaust gas enters from the air inlet pipe and flows out from the spray outer cylinder after passing through the spray inner cylinder and the spray outer cylinder, and the spray mechanism covers the flow path of the exhaust gas from the upper side; A cyclone separation module connected to the spray module, the cyclone separation module comprising a cyclone separation cylinder, an ejector connected to the side wall of the cyclone separation cylinder, and the ejector connected to the spray outer cylinder of the spray module; A sedimentation separation module is connected to the cyclone separation module, and the sedimentation separation module includes a sedimentation tank, an overflow tank connected to the sedimentation tank, a sewage recovery pipe connected to the overflow tank, and a cleaning mechanism arranged on the top of the sedimentation tank and the overflow tank.

2. The tar-containing waste gas treatment device according to claim 1, characterized in that: The top of the spray inner cylinder is an open end, and there is a gap between the top of the spray inner cylinder and the inner top of the spray outer cylinder, between the top of the air inlet pipe and the inner top of the spray outer cylinder, and a guide wall is connected to the inner top of the spray outer cylinder, and the guide wall is located between the inner wall of the spray inner cylinder and the outer wall of the air inlet pipe, and there is a gap between the bottom of the guide wall and the bottom of the spray inner cylinder.

3. The tar-containing waste gas treatment device according to claim 2, characterized in that: The spray outer cylinder, the spray inner cylinder, the guide wall, and the position where the air intake pipe contacts the exhaust gas are all provided with an anti-adhesion coating.

4. The tar-containing waste gas treatment device according to claim 1, characterized in that: The bottom of the air intake pipe is connected with a ventilation pipe, and the ventilation pipe is connected with an air guide pipe for introducing exhaust gas.

5. The tar-containing waste gas treatment device according to claim 1, characterized in that: The air intake pipe comprises an inner liner and an outer shell, wherein a hollow portion is provided between the inner liner and the outer shell, and the hollow portion is filled with a heat-conducting medium.

6. The tar-containing waste gas treatment device according to claim 1, characterized in that: The cyclone separation module includes a spray cleaning mechanism arranged in the cyclone separation barrel, the spray cleaning mechanism includes a cyclone plate, a spray assembly arranged above the cyclone plate, and a cleaning assembly arranged below the cyclone plate. The connection position between the ejector and the cyclone separation barrel is located below the cyclone plate.

7. The tar-containing waste gas treatment device according to claim 1, characterized in that: The sedimentation separation module comprises a collecting barrel arranged below the sedimentation tank, a slag discharge port is arranged at the bottom of the spray inner cylinder, and the slag discharge port is connected to the collecting barrel; an anti-adhesion filter screen is arranged between the sedimentation tank and the overflow tank.

8. A method for treating tar-containing waste gas, using the tar-containing waste gas treatment device according to any one of claims 1 to 7, characterized in that: The waste gas containing tar is introduced into the air inlet pipe of the spray module, and the waste gas flows through the air inlet pipe, the spray inner cylinder and the spray outer cylinder in turn. During the flow of the waste gas in the spray module, the spray mechanism sprays water mist to separate the tar from the waste gas. The waste gas leaves the spray outer cylinder and enters the cyclone separation cylinder. The waste gas is mixed with water mist in the cyclone separation cylinder and spirally moves along the cylinder wall to separate the tar in the waste gas again. After that, the waste gas passes through the cyclone separation cylinder and the spray assembly at the top of the cyclone separation cylinder to separate the tar for the last time. After the last separation of the tar, the waste gas flows out of the cyclone separation cylinder.

9. The method for treating tar-containing waste gas according to claim 8, characterized in that: After the spray mechanism sprays water mist to separate the tar from the exhaust gas, the separated tar is discharged from the bottom of the spray inner cylinder and flows into the collection bucket; The tar and water mist separated in the cyclone separation cylinder form a mixed liquid and enter the sedimentation tank for sedimentation. After sedimentation, the tar is discharged from the bottom of the sedimentation tank to the collection barrel.

10. The method for treating tar-containing waste gas according to claim 8, characterized in that: When the exhaust gas containing tar is introduced into the air inlet pipe of the spray module, fresh air is introduced at the same time to mix with the exhaust gas to cool the exhaust gas.

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