A system for pretreating exhaust particulate matter for production of chlorothalonil
By combining a cyclone separator and a bipolar centrifugal filter, particulate matter in the exhaust gas from chlorothalonil production is pretreated, solving the problem of frequent clogging of baghouse dust collectors and achieving lower environmental risks and costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU WEUNITE FINE CHEM CO LTD
- Filing Date
- 2026-05-11
- Publication Date
- 2026-06-30
AI Technical Summary
In existing technologies, the exhaust gas generated during the production of chlorothalonil directly enters the bag filter, causing frequent clogging of the filter bags, resulting in environmental pollution and increased production costs.
A combined system of cyclone separator and bipolar centrifugal filter is used to pre-treat particulate matter in the exhaust gas, including the design of reflector screen and multiple flow obstruction components, to increase the separation and collection effect of particulate matter.
It reduces the frequency of filter bag replacement in baghouse dust collectors, lowers the risk of environmental fumes and operating costs, and improves the collection efficiency of exhaust gas particulate matter.
Smart Images
Figure CN122298136A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of chlorothalonil processing exhaust gas treatment technology, and in particular to a chlorothalonil production exhaust gas particulate pretreatment system. Background Technology
[0002] Chlorothalonil is a broad-spectrum protective fungicide with no systemic activity. It primarily prevents various diseases such as downy mildew, blight, and powdery mildew on vegetables and fruit trees by inhibiting fungal spore germination. During the chlorothalonil production process, most of the material is cooled and collected by a trap in the early stages. However, unreacted substances (monochloro, dichloro, trichloro, etc.) are inevitably produced during the reaction. The bulk density of these substances is only... With a fineness of 325 mesh or higher accounting for 90%, this substance is difficult to settle in the collector and will be carried into the subsequent tail gas acid absorption system.
[0003] In existing technologies, the exhaust gas generated during the production of chlorothalonil mainly relies on adding a bag filter directly after the filter to collect incompletely reacted substances. However, since the reaction collection requires negative pressure, a small amount of moisture from the air will enter the system, resulting in a system moisture content of approximately 2%. When the moisture content is high, the particulate matter carried in the filter will adhere to the filter bags, causing frequent clogging. Furthermore, when replacing the filter bags, the presence of a small amount of hydrogen chloride gas will generate significant fumes, affecting the on-site environment and increasing production costs. Summary of the Invention
[0004] This invention provides a particulate matter pretreatment system for exhaust gas from chlorothalonil production, which solves the shortcomings of existing technologies where exhaust gas from chlorothalonil production is directly fed into bag filters after capture, resulting in frequent bag replacements and environmental impact.
[0005] This invention provides a particulate matter pretreatment system for exhaust gas in the production of chlorothalonil, comprising a first separation section and a second separation section arranged sequentially along the exhaust gas conveying direction; the first separation section includes at least one cyclone separator, and a reflective screen is provided at the bottom of the cyclone separator, with a ash discharge channel formed between the inner wall of the cyclone separator and the reflective screen; the second separation section includes at least one bipolar centrifugal filter arranged at the tail end of the first separation section along the exhaust gas conveying direction, and a swirl initiator and at least one flow-blocking element are arranged sequentially along the exhaust gas conveying line inside the bipolar centrifugal filter; wherein, a spindle is coaxially arranged inside the bipolar centrifugal filter, and the exhaust gas particles discharged from the first separation section are centrifugally vortexed by the swirl initiator and then impact the inner wall of the bipolar centrifugal filter in the second separation section after passing through the flow-blocking element.
[0006] In a further embodiment, the reflector is inverted conical, and the bottom edge of the reflector is fixedly connected to the inner wall of the cyclone separator by a plurality of thin rods.
[0007] In a further embodiment, both ends of the bipolar centrifugal filter are tapered, the swirl initiator includes multiple fins arranged around the inner wall of the bipolar centrifugal filter, the flow obstruction includes a first flow obstruction cone disposed inside the bipolar centrifugal filter, and a first ash discharge port is disposed at the bottom of the bipolar centrifugal filter below the first flow obstruction cone.
[0008] In a further embodiment, the flow obstruction component includes a flow obstruction shroud disposed on the side of the first flow obstruction cone away from the swirl initiation component. The diameter of the flow obstruction shroud gradually increases along the exhaust gas conveying direction. The edge of the flow obstruction shroud away from the first flow obstruction cone is fixedly connected to the inner wall of the bipolar centrifugal filter.
[0009] In a further embodiment, the flow obstruction element includes a second flow obstruction cone disposed on the side of the flow obstruction shroud away from the first flow obstruction cone. A baffle is disposed on the surface of the second flow obstruction cone, and a flow obstruction channel is formed between the surface of the baffle and the inner wall of the bipolar centrifugal filter. The width of the flow obstruction channel gradually decreases along the exhaust gas conveying direction.
[0010] In a further embodiment, the flow obstruction component further includes a flow obstruction filter plate disposed on the side of the second flow obstruction cone away from the flow obstruction shroud, wherein there is an angle of less than 90° between the radial direction of the flow obstruction filter plate and the axial direction of the bipolar centrifugal filter, and a second ash discharge port is disposed at the bottom of the bipolar centrifugal filter below the flow obstruction filter plate.
[0011] In a further embodiment, a rectifier is provided on the side of the flow-blocking filter plate away from the second flow-blocking cone.
[0012] In a further embodiment, a protective layer is provided on the inner wall of the cyclone separator.
[0013] In a further embodiment, the protective layer comprises at least one of polytetrafluoroethylene, alumina ceramic, silicon carbide ceramic, and polypropylene.
[0014] The present invention provides a particulate matter pretreatment system for exhaust gas from chlorothalonil production, which has the following technical effects or advantages: Before the exhaust gas enters the baghouse dust collector, it is first passed through multiple separation sections. A combination of cyclone separators and bipolar centrifugal filters prioritizes the removal of particulate matter from the exhaust gas, reducing the frequency of bag replacement in the dust collector and simultaneously mitigating the environmental risks of smoke generated during bag replacement and lowering bag usage costs. A reflector screen at the bottom of the cyclone separator reduces the risk of dust collected at the bottom being re-erected, ensuring effective dust removal. The bipolar centrifugal filter, with its sequentially arranged swirl-inducing and flow-blocking components, guides the exhaust gas carrying particulate matter. After generating centrifugal vortices, the particles undergo multiple dispersion and flow-blocking processes before being collected and discharged by the bipolar centrifugal filter, increasing the collection and separation efficiency of particulate matter in the exhaust gas. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the structure of a particulate matter pretreatment system for chlorothalonil production provided in an embodiment of the present invention; Figure 2 This is the present invention. Figure 1 Enlarged schematic diagram of the structure at point A in the diagram; Figure 3 This is a three-dimensional enlarged schematic diagram of a portion of the exhaust gas particulate matter pretreatment system for chlorothalonil production according to an embodiment of the present invention. Figure 1 ; Figure 4 This is a three-dimensional enlarged schematic diagram of a portion of the exhaust gas particulate matter pretreatment system for chlorothalonil production according to an embodiment of the present invention. Figure 2 ; Figure 5 This is an enlarged internal schematic diagram of a portion of the exhaust gas particulate matter pretreatment system for chlorothalonil production according to an embodiment of the present invention.
[0017] Figure label: 1. First separation section; 101. Cyclone separator; 102. Reflector screen; 103. Ash discharge channel; 2. Second separation section; 201. Bipolar centrifugal filter; 202. Mandrel; 3. Rotation starter; 301. Fin; 4. Flow obstruction component; 401. First flow obstruction cone; 402. Flow obstruction hood; 403. Second flow obstruction cone; 404. Baffle; 405. Flow obstruction filter plate; 5. Thin rod; 6. First ash discharge port; 7. Flow obstruction channel; 8. Second ash discharge port; 9. Rectifier; 10. Protective layer. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0019] As mentioned earlier, the existing technology for treating the exhaust gas from chlorothalonil production mainly relies on adding a bag filter directly after the dust collector to capture incompletely reacted substances. However, since the reaction collection requires negative pressure, a small amount of moisture from the air will enter the system, resulting in a system moisture content of approximately 2%. When the moisture content is high, the particulate matter carried within will adhere to the filter bags, causing frequent clogging. Furthermore, when replacing the filter bags, the presence of a small amount of hydrogen chloride gas will generate significant fumes, affecting the on-site environment and increasing production costs.
[0020] To address this, the present invention provides a particulate matter pretreatment system for exhaust gas from chlorothalonil production. This system allows the exhaust gas generated during chlorothalonil production to be pre-treated by passing it through multiple separation sections before it enters a baghouse dust collector. The system utilizes a combination of a cyclone separator 101 and a bipolar centrifugal filter 201 to preferentially remove particulate matter from the exhaust gas, reducing the frequency of bag replacement in the baghouse dust collector and simultaneously reducing the environmental risk of smoke generated during bag replacement and lowering bag usage costs.
[0021] The swirl-inducing element 3 and the flow-blocking element 4, arranged sequentially in the bipolar centrifugal filter 201, guide the exhaust gas carrying particulate matter. After the particulate matter generates a centrifugal vortex, it is dispersed and blocked by the first flow-blocking cone 401, the flow-blocking hood 402, the second flow-blocking cone 403, the baffle 404, and the inclined flow-blocking filter plate 405, and is then collected and discharged by the bipolar centrifugal filter 201, thereby increasing the collection and separation effect of particulate matter in the exhaust gas.
[0022] The following is combined Figures 1-5 This invention is described in detail.
[0023] like Figures 1-5 As shown, the present invention provides an exhaust gas treatment system, particularly an exhaust gas particulate pretreatment system for chlorothalonil production. In this embodiment, the exhaust gas treatment system mainly includes a first separation section 1 and a second separation section 2, which are located after the collector of chlorothalonil production exhaust gas and before dust removal equipment such as bag filters. The first separation section 1 includes at least one cyclone separator 101, which can be configured as follows: Figure 3As shown, the cone angle of the long conical portion at the bottom is less than 20°, and its surface is provided with two inspection ports. When the first separation section 1 includes multiple cyclone separators 101, the multiple cyclone separators 101 are connected in series. The inner wall of the cyclone separator 101 is provided with a protective layer 10, which may include any one of polytetrafluoroethylene, alumina ceramic, silicon carbide ceramic, and polypropylene. An upward internal vortex is generated inside the cyclone separator 101, which has a very strong suction force and can easily re-roll up the light materials that have just fallen to the bottom. In order to prevent the dust collected and discharged at the bottom of the cyclone separator 101 from being carried upward and mixed into the airflow, a reflector 102 is provided inside the cyclone separator 101 near the bottom dust discharge position. The reflector 102 is inverted conical, and the bottom edge of the reflector 102 is fixedly connected to the inner wall of the cyclone separator 101 by multiple thin rods 5. An annular ash discharge channel 103 is formed between the bottom edge of the reflector 102 and the inner wall of the cyclone separator 101. The reflector 102 prevents the upward airflow generated during ash discharge from the cyclone separator 101 from carrying dust to the surface, and the ash discharge channel 103 allows the dust impacting the inner wall of the cyclone separator 101 to collect downwards and be discharged. The protective layer 10 on the inner wall of the cyclone separator 101 prevents acidic gases from corroding the cyclone and prevents the agglomeration of particulate matter in the exhaust gas.
[0024] At the tail end of the first separation section 1, i.e., at the exhaust point of all cyclone separators 101, a second separation section 2 is provided. The second separation section 2 includes at least one bipolar centrifugal filter 201, which can be used as follows: Figure 4 As shown, the bipolar centrifugal filter 201 is a horizontally placed tubular structure, with an air inlet at one end and an air outlet at the other. Two ash discharge ports are located at the bottom of the filter: a first ash discharge port 6 and a second ash discharge port 8. A spindle 202 is positioned along the axis inside the bipolar centrifugal filter 201. The spindle 202 serves as the mounting base for the swirl-inducing component 3 and the flow-blocking component 4 inside the filter 201, and increases the contact area for particle impact within the filter 201. This increases the probability of particle impact within the filter 201, thereby increasing the efficiency of particle capture and treatment in the exhaust gas.
[0025] The inlet and outlet of the bipolar centrifugal filter 201 are both tapered, and two inspection ports with blind plates are provided at the top. The two ends of the spindle 202 are fixedly connected to the inner wall of the bipolar centrifugal filter 201 by multiple rods. Inside the bipolar centrifugal filter 201, along the direction of exhaust gas delivery, a vortex initiator 3 and a flow obstructor 4 are arranged sequentially. The vortex initiator 3 includes multiple fins 301 arranged in a ring at the inlet of the bipolar centrifugal filter 201. After the exhaust gas passes through the channel between the fins 301, a vortex is generated inside the bipolar centrifugal filter 201, generating centrifugal force on the particulate matter in the exhaust gas. This facilitates the impact of the particulate matter in the exhaust gas onto the inner wall of the bipolar centrifugal filter 201, collecting and discharging the particulate matter.
[0026] The flow obstruction element 4 may sequentially include a first flow obstruction cone 401, a flow obstruction shroud 402, a second flow obstruction cone 403, a baffle block 404, and a flow obstruction filter plate 405 disposed at the rear end of the swirl starter 3 along the exhaust emission direction. The flow obstruction element 4 may be as follows: Figure 5 As shown, after the exhaust gas passes through the swirl-initiating element 3, it carries particles that impact the first flow-blocking cone 401. The first flow-blocking cone 401 disperses the exhaust gas, causing the particles to impact the inner wall of the bipolar centrifugal filter 201 for the first time. Some of the particles in the exhaust gas collect and fall off. The first ash discharge port 6 is located below the first flow-blocking cone 401. The tail end of the flow-blocking hood 402 is fixedly connected to the inner wall of the bipolar centrifugal filter 201, and the tail end of the flow-blocking hood 402 is located on the edge of the first ash discharge port 6 away from the swirl-initiating element 3. After the first dispersion, the exhaust gas is dispersed and blocked a second time by the flow-blocking hood 402. The inner diameter of the flow-blocking hood 402 gradually increases along the direction of exhaust gas transport. The exhaust gas carries particles that impact the side wall of the flow-blocking hood 402, and the remaining particles collect. The exhaust gas undergoes a second ash discharge, and the collected particles fall out of the first ash discharge port 6.
[0027] The exhaust gas passing through the center of the baffle 402 is guided and dispersed by the second baffle cone 403, and once again carries the particulate matter into the inner wall of the bipolar centrifugal filter 201. To further increase the interception of particulate matter at this point, on the outer surface of the second baffle cone 403, such as... Figure 5 As shown, a baffle 404 is provided. The space between the outer surface of the baffle 404 and the inner wall of the bipolar centrifugal filter 201 gradually decreases with the direction of airflow, and the tail edge of the baffle 404 is raised outward to form a flow obstruction channel 7, which further increases the collection effect of the bipolar centrifugal filter 201 on particulate matter in the exhaust gas.
[0028] At the tail end of the second flow-blocking cone 403, a flow-blocking filter plate 405 is provided, such as Figure 5As shown, there is an angle of less than 90° between the radial direction of the flow-blocking filter plate 405 and the axial direction of the bipolar centrifugal filter 201, i.e., the axial direction of the spindle 202. This means the contact angle between the flow of the exhaust gas and the plane of the flow-blocking filter plate 405 is not perpendicular. The inclined flow-blocking filter plate 405 increases the contact area between the exhaust gas and the filter plate, improving the interception efficiency of the flow-blocking filter plate 405 for particulate matter in the exhaust gas. Finally, the exhaust gas flows out through the rectifier 9 at the rear end of the flow-blocking filter plate 405 to the exhaust port of the bipolar centrifugal filter 201. The dust intercepted and collected by the second flow-blocking cone 403 and the dust intercepted and collected by the flow-blocking filter plate 405 are discharged from the second ash discharge port 8 below.
[0029] When the second separation section 2 uses multiple bipolar centrifugal filters 201, the bipolar centrifugal filters 201 are connected in series by connecting the exhaust end to the intake end of the next bipolar centrifugal filter 201.
[0030] Multiple first separation sections 1 and second separation sections 2 can be connected in parallel and in series at the exhaust gas discharge point of the chlorothalonil production equipment to further increase the removal effect of particulate matter in the exhaust gas and ensure the use of the exhaust gas particulate matter pretreatment system.
[0031] In summary, the chlorothalonil production exhaust gas particulate pretreatment system of the present invention has the following advantages: First, before the exhaust gas generated during the production of chlorothalonil is introduced into the bag filter, it is first introduced into multiple separation sections. By using the combination of cyclone separator 101 and bipolar centrifugal filter 201, particulate matter in the exhaust gas is preferentially removed, reducing the frequency of bag replacement in the bag filter, and simultaneously reducing the environmental risk of smoke generated during bag replacement and lowering the cost of bag use.
[0032] Second, the swirl-inducing element 3 and the flow-blocking element 4, arranged sequentially in the bipolar centrifugal filter 201, guide the exhaust gas carrying particulate matter. After the particulate matter generates a centrifugal vortex, it is dispersed and blocked by the first flow-blocking cone 401, the flow-blocking hood 402, the second flow-blocking cone 403, the baffle 404, and the inclined flow-blocking filter plate 405, and is then collected and discharged by the bipolar centrifugal filter 201, thereby increasing the collection and separation effect of particulate matter in the exhaust gas.
[0033] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A particulate matter pretreatment system for exhaust gas from chlorothalonil production, characterized in that, It includes a first separation section (1) and a second separation section (2) arranged sequentially along the exhaust gas conveying direction; The first separation section (1) includes at least one cyclone separator (101), and a reflective screen (102) is provided at the bottom of the interior of the cyclone separator (101). A dust discharge channel (103) is formed between the inner wall of the cyclone separator (101) and the reflective screen (102). The second separation section (2) includes at least one bipolar centrifugal filter (201) disposed at the tail end of the first separation section (1) along the exhaust gas conveying direction. The bipolar centrifugal filter (201) is provided with a swirl starter (3) and at least one flow obstructor (4) in sequence along the exhaust gas conveying line inside. The bipolar centrifugal filter (201) has a spindle (202) coaxially arranged inside it. The exhaust gas particles discharged from the first separation section (1) generate centrifugal vortex after passing through the swirl starter (3), and then pass through the flow blocking member (4) in the second separation section (2) and impact the inner wall of the bipolar centrifugal filter (201).
2. The particulate matter pretreatment system for chlorothalonil production as described in claim 1, characterized in that, The reflector (102) is an inverted cone shape, and the bottom edge of the reflector (102) is fixedly connected to the inner wall of the cyclone separator (101) by a number of thin rods (5).
3. The particulate matter pretreatment system for chlorothalonil production as described in claim 1, characterized in that, Both ends of the bipolar centrifugal filter (201) are closed. The swirl starter (3) includes multiple fins (301) arranged around the inner wall of the bipolar centrifugal filter (201). The flow obstruction member (4) includes a first flow obstruction cone (401) disposed inside the bipolar centrifugal filter (201). The bottom of the bipolar centrifugal filter (201) is provided with a first ash discharge port (6) below the first flow obstruction cone (401).
4. The particulate matter pretreatment system for chlorothalonil production as described in claim 3, characterized in that, The flow obstruction component (4) includes a flow obstruction hood (402) disposed on the side of the first flow obstruction cone (401) away from the swirl starter (3). The diameter of the flow obstruction hood (402) gradually increases along the exhaust gas conveying direction. The edge of the flow obstruction hood (402) away from the first flow obstruction cone (401) is fixedly connected to the inner wall of the bipolar centrifugal filter (201).
5. The particulate matter pretreatment system for chlorothalonil production as described in claim 4, characterized in that, The flow obstruction component (4) includes a second flow obstruction cone (403) disposed on the side of the flow obstruction shroud (402) away from the first flow obstruction cone (401). A baffle (404) is disposed on the surface of the second flow obstruction cone (403). A flow obstruction channel (7) is formed between the surface of the baffle (404) and the inner wall of the bipolar centrifugal filter (201). The width of the flow obstruction channel (7) gradually decreases along the direction of exhaust gas delivery.
6. The particulate matter pretreatment system for chlorothalonil production as described in claim 5, characterized in that, The flow-blocking component (4) also includes a flow-blocking filter plate (405) disposed on the side of the second flow-blocking cone (403) away from the flow-blocking hood (402). There is an angle of less than 90° between the radial direction of the flow-blocking filter plate (405) and the axial direction of the bipolar centrifugal filter (201). The bottom of the bipolar centrifugal filter (201) is provided with a second ash discharge port (8) below the flow-blocking filter plate (405).
7. The particulate matter pretreatment system for chlorothalonil production as described in claim 6, characterized in that, A rectifier (9) is provided on the side of the flow-blocking filter plate (405) away from the second flow-blocking cone (403).
8. The particulate matter pretreatment system for chlorothalonil production as described in claim 2, characterized in that, The inner wall of the cyclone separator (101) is provided with a protective layer (10).
9. The particulate matter pretreatment system for chlorothalonil production according to claim 8, characterized in that, The protective layer (10) includes at least one of polytetrafluoroethylene, alumina ceramic, silicon carbide ceramic, and polypropylene.