Waste gas treatment device for continuous production of polypropylene

Abstract

A waste gas treatment device for continuous production of polypropylene belongs to the field of waste gas treatment and comprises a filter box and a gas inlet pipe, the gas inlet pipe is communicated with the filter box, a cooling pipe is arranged in the gas inlet pipe and comprises a row of cooling coils, the cooling coils are communicated and connected in series through connecting pipes, and a partition plate and a rotating cylinder are arranged between every two adjacent cooling coils. The partition plates are fixed to the air inlet pipe, the rotating cylinders are rotationally installed on the air inlet pipe, the closed end faces of the rotating cylinders are in sliding contact fit with the corresponding partition plates, and vent holes are formed in the end faces of the rotating cylinders. The device is simple in structure and ingenious in conception, the cooling pipes with different lengths are automatically selected to cool waste gas according to the temperature of the waste gas, so that the waste gas is cooled in a proper temperature range, and the situation that polypropylene particles are softened and adhered to a filter plate due to the fact that the temperature of the filtered waste gas is too high or dews on the filter plate due to the fact that the temperature is too low is avoided. Therefore, the permeability of the filter plate is improved, and the service life of the filter plate is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment, specifically a waste gas treatment device for continuous polypropylene production. Background Technology

[0002] In the continuous production process of polypropylene, dust-containing waste gas is generated. The optimal filtration temperature for polypropylene waste gas dust is 60-80℃. If the waste gas temperature is too high (close to 90-100℃), the dust may begin to soften and adhere to the filter media surface, causing melting and adhesion, clogging the filter bags or filter cartridges. If the waste gas temperature is too low (below 60℃), especially when the humidity is high, water vapor easily condenses on the filter media surface, causing the dust to absorb moisture and clump together, also affecting filtration efficiency. In existing technologies, waste gas treatment devices often lack precise temperature control mechanisms, making it difficult to automatically adjust the waste gas temperature. This makes them prone to condensation or melting problems due to temperature fluctuations, thereby reducing filtration efficiency, shortening the service life of the filter media, and increasing maintenance costs. Therefore, there is an urgent need for a treatment device that can automatically adjust the waste gas temperature and ensure filtration stability. Summary of the Invention

[0003] This invention provides a waste gas treatment device for continuous polypropylene production, which addresses the deficiencies in the prior art.

[0004] This invention is achieved through the following technical solution: A waste gas treatment device for continuous polypropylene production includes a filter box and an inlet pipe. The inlet pipe is connected to the filter box and has a cooling pipe inside. The cooling pipe includes a row of several cooling coils connected in series by connecting pipes. A partition and a rotating cylinder are respectively provided between adjacent cooling coils. The partition is fixed on the inlet pipe, and the rotating cylinder is rotatably mounted on the inlet pipe. The closed end face of the rotating cylinder is in sliding contact with the corresponding partition. A vent hole is opened on the end face of the rotating cylinder. Ventilation grooves are opened on the side of the partition corresponding to the vent hole. An outlet hole is opened on the side of the rotating cylinder, and an outlet groove is opened on the inlet pipe corresponding to the outlet hole. The outlet grooves are respectively connected to the inlet end of the filter box. A heat-sensing drive device is provided on the rotating cylinder. When the temperature inside the rotating cylinder rises, the heat-sensing drive device drives the rotating cylinder to rotate, so that the outlet hole and the outlet groove are first connected, then disconnected, and then connected again.

[0005] As described above, in a polypropylene continuous production waste gas treatment device, the thermal induction drive device includes a support shaft, which is fixed on a partition plate. A support ring is slidably fitted on the outer periphery of the support shaft. The support ring is connected to a rotating cylinder through an elastic telescopic member. Several hot bimetallic strips are fixed on the rotating cylinder. The movable ends of the hot bimetallic strips can push the support ring to move axially along the support shaft. A guide groove is opened on the support shaft, and a slide rod is slidably provided in the guide groove. The slide rod is fixed on the support ring.

[0006] In the polypropylene continuous production waste gas treatment device described above, the support shaft, support ring, and hot bimetallic strip are located in the reserved groove on the end face of the rotating cylinder.

[0007] As described above, in a polypropylene continuous production waste gas treatment device, the elastic telescopic component includes a smooth rod, a support ring with an insertion hole, the smooth rod slidingly located within the insertion hole, the smooth rod being fixedly connected to the rotating cylinder, and the smooth rod being connected to the support ring via a spring.

[0008] In the polypropylene continuous production waste gas treatment device described above, the spring is fitted around the outer periphery of the smooth rod, one end of the spring is fixedly connected to the support ring, and the other end is fixedly connected to the smooth rod.

[0009] As described above, a waste gas treatment device for continuous polypropylene production includes an inclined filter plate fixedly installed inside the filter box, an exhaust port and a slag discharge port on the filter box, a sealing cover fitted to the side of the slag discharge port, and a support leg fixedly installed on the filter box.

[0010] The advantages of this invention are: 1. Automatic temperature control: The exhaust gas temperature is sensed by a heat-sensing drive device (such as a hot bimetallic strip), which automatically drives the rotating drum to rotate, thereby dynamically selecting cooling pipes of different lengths to cool the exhaust gas, so that the exhaust gas temperature is always kept in a suitable range of 60~80℃. This effectively avoids the polypropylene particles from softening and sticking to the filter plate due to excessively high temperature, or the filter plate from condensation and dust caking due to excessively low temperature.

[0011] 2. Improve filtration efficiency: Through segmented cooling and intelligent path switching, exhaust gas is ensured to enter the filter box at the optimal temperature, significantly improving the permeability of the filter plate, reducing the risk of clogging, and extending the service life of the filter plate.

[0012] 3. Simple and reliable structure: The device adopts mechanical thermal induction drive, which does not require external power or complex control system. It is ingeniously designed, runs stably, and has low maintenance cost.

[0013] 4. Easy to clean and maintain: The filter box is equipped with an inclined filter plate and a slag discharge port. With the sealing cover, the accumulated particles can be easily removed, ensuring the long-term efficient operation of the device.

[0014] 5. Energy saving and environmental protection: Precise temperature control reduces energy waste and improves the quality of waste gas treatment, meeting environmental protection requirements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Enlarged view of part I; Figure 3 It is along Figure 1 A cross-sectional view along line AA.

[0017] Figure label: 1. Filter box; 2. Inlet pipe; 3. Cooling pipe; 4. Baffle plate; 5. Rotating cylinder; 6. Vent hole; 7. Vent groove; 8. Outlet hole; 9. Outlet groove; 10. Inlet hole; 11. Connecting pipe; 20. Support shaft; 21. Support ring; 22. Hot bimetallic strip; 23. Guide groove; 24. Slide rod; 30. Reserved groove; 40. Smooth rod; 41. Insertion hole; 42. Spring; 60. Filter plate; 61. Exhaust hole; 62. Slag discharge port; 63. Sealing cover; 64. Support leg; 301. Cooling coil; 302. Through connecting pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] A waste gas treatment device for continuous polypropylene production, such as Figure 1 , Figure 2 , Figure 3As shown, the system includes a filter box 1 and an air inlet pipe 2. The air inlet pipe 2 is connected to the filter box 1. A cooling pipe 3 is installed inside the air inlet pipe 2. The cooling pipe 3 includes a row of several cooling coils 301, which are connected in series by a connecting pipe 302. A partition plate 4 and a rotating cylinder 5 are respectively provided between adjacent cooling coils 301. The partition plate 4 is fixed on the air inlet pipe 2 and divides the interior of the air inlet pipe 2 into several non-communicating cooling cavities. The rotating cylinder 5 is rotatably mounted on the air inlet pipe 2. An annular groove is opened on the outer circumference of the rotating cylinder 5. The annular groove is fixedly connected to the inner ring of the bearing. The outer ring of the bearing is fixedly connected to the air inlet pipe 2. The rotating cylinder 5, the air inlet pipe 2, and the bearing are coaxially arranged. The closed end face of the rotating cylinder 5 is in sliding contact with the corresponding partition plate 4. A vent hole 6 is opened on the end face of the rotating cylinder 5. A vent groove 7 is opened on the side of the partition plate 4 corresponding to the vent hole 6. In the initial state, the vent hole 6 and the vent groove 7 are staggered. The rotating cylinder 5 rotates... After rotation, the vent 6 and vent groove 7 gradually overlap, connecting the different cavities. An vent 8 is opened on the side of the rotating cylinder 5, and vent grooves 9 are opened on the air inlet pipe 2 corresponding to the vent 8. The vent grooves 9 are connected to the air inlet end of the filter box 1. Initially, the vent 8 and vent groove 9 are misaligned. After the rotating cylinder 5 rotates, the vent 8 and vent groove 9 gradually overlap, then gradually de-overlap, causing the vent 8 and vent groove 9 to first connect and then disconnect. The air trough 9 and the air inlet 10 on the filter box 1 are connected by connecting pipes 11. The air outlet at the left end of the air inlet pipe 2 is also connected to the air inlet of the filter box 1 by connecting pipe 11. The air inlet of the air inlet pipe 2 is located at the right end. The rotating cylinder 5 is equipped with a heat-sensing drive device. When the temperature inside the rotating cylinder 5 rises, the heat-sensing drive device drives the rotating cylinder 5 to rotate, so that the air outlet 8 and the air outlet trough 9 are first connected, then disconnected, and then the air vent 6 is connected to the air vent trough 7. The present invention has a simple structure and ingenious design. According to the temperature of the waste gas, the cooling pipes 3 of different lengths are automatically selected to cool the waste gas, so that the waste gas is cooled within an appropriate temperature range. This avoids the waste gas temperature being too high, causing the polypropylene particles to soften and stick to the filter plate, or the temperature being too low, causing condensation on the filter plate, which would cause the polypropylene particles to clump and block the filter plate. This improves the permeability of the filter plate and extends its service life.When using this invention, a cooling medium is first introduced into the cooling pipe 3. Then, the high-temperature exhaust gas to be filtered enters the intake pipe 2 through the intake port at the right end of the intake pipe 2. The high-temperature exhaust gas is first cooled by the condenser coil 301 in the first cooling cavity at the right end. The cooled exhaust gas enters the rotating cylinder 5 at the far right end. The thermal induction drive device drives the rotating cylinder 5 to rotate under the action of the exhaust gas temperature, so that the exhaust port 8 and the exhaust groove 9 gradually overlap. The exhaust gas enters the filter box 1 through the exhaust port 8 and the exhaust groove 9 for filtration. If the exhaust gas temperature is still too high... The rotating cylinder 5 continues to rotate until the air outlet 8 and the air outlet groove 9 no longer coincide. At this point, the exhaust gas stops entering the filter box 1. Simultaneously, the air vent 6 and the air groove 7 gradually coincide, and the exhaust gas enters the next cooling cavity through the air vent 6 and the air groove 7 for cooling. This process continues, with the exhaust gas entering the filter box 1 one by one through the air outlet groove 9 from right to left, until the exhaust gas is cooled to a suitable temperature. The exhaust gas then continues to enter the filter box 1 through the corresponding air outlet groove 9 for filtration. When the temperature inside the air inlet pipe 2 decreases or the injection of exhaust gas into the air inlet pipe 2 stops, the above process is reversed.

[0020] Specifically, as shown in the figure, the thermal induction drive device of this embodiment includes a support shaft 20, which is fixed on the partition plate 4. A support ring 21 is slidably fitted on the outer periphery of the support shaft 20. The support shaft 20 and the support ring 21 are coaxially arranged with the rotating cylinder 5. The support ring 21 and the rotating cylinder 5 are connected by an elastic telescopic member. Several hot bimetallic strips 22 are fixed on the rotating cylinder 5. The movable end of the hot bimetallic strip 22 can push the support ring 21 to move axially along the support shaft 20. A guide groove 23 is opened on the support shaft 20. A slide rod 24 is slidably arranged in the guide groove 23. The slide rod 24 is fixed on the support ring 21. When the waste gas temperature inside the rotating cylinder 5 is too high, the hot bimetallic strip 22 bends due to heat, and its movable end pushes the support ring 21 to move to the left along the support shaft 20. The support ring 21 drives the slide rod 24 to slide along the guide groove 23. The support ring 21 rotates relative to the support shaft 20. The support ring 21 drives the rotating cylinder 5 to rotate through the elastic telescopic component. The vent hole 8 and the vent groove 9 gradually overlap. The waste gas enters the filter box 1 through the vent hole 8 and the vent groove 9 for filtration. If the waste gas temperature is too high, the rotating cylinder 5 continues to rotate until the vent hole 8 and the vent groove 9 no longer overlap. The waste gas stops and directly enters the filter box 1. At the same time, the vent hole 6 and the vent groove 7 gradually overlap. The waste gas enters the next cooling cavity through the vent hole 6 and the vent groove 7 for cooling. After the waste gas stops entering the air inlet pipe 2, the hot bimetallic strip 22 cools down, and the rotating cylinder 5 rotates in the opposite direction to reset. The vent hole 6 and the vent groove 7 are no longer connected, and the vent hole 8 and the vent groove 9 are also no longer connected.

[0021] Specifically, as shown in the figure, in this embodiment, the support shaft 20, support ring 21, and hot bimetallic strip 22 are located in the reserved groove 30 on the end face of the rotating cylinder 5. This saves space and reduces the impact of particles in the exhaust gas on the guide slide 23.

[0022] Furthermore, as shown in the figure, the elastic telescopic component described in this embodiment includes a smooth rod 40, an insertion hole 41 on the support ring 21, the smooth rod 40 slidingly located within the insertion hole 41, the smooth rod 40 being fixedly connected to the rotating cylinder 5, and the smooth rod 40 being connected to the support ring 21 via a spring 42. When the support ring 21 moves left and right along the support shaft 20, the smooth rod 40 slides left and right within the insertion hole 41. When the hot bimetallic strip 22 pushes the support ring 21 to move to the left relative to the support shaft 20, the spring 42 is compressed and stores energy. After the hot bimetallic strip 22 cools and resets, the support ring 21 moves to the right and resets under the action of the spring 42.

[0023] Furthermore, as shown in the figure, in this embodiment, the spring 42 is fitted around the outer periphery of the smooth rod 40. One end of the spring 42 is fixedly connected to the support ring 21, and the other end is fixedly connected to the smooth rod 40. The spring 42 is fitted around the outer periphery of the smooth rod 40 to increase the stability of the spring 42 when it is compressed.

[0024] Furthermore, as shown in the figure, the filter box 1 described in this embodiment is fixedly equipped with an inclined filter plate 60. The filter box 1 has an exhaust port 61 and a slag discharge port 62. A sealing cover 63 is fitted to the side of the slag discharge port 62. A support leg 64 is fixedly installed on the filter box 1. The exhaust gas entering the filter box 1 is filtered by the filter plate 60 and then discharged from the filter box 1 through the exhaust port 61. Particulate matter in the exhaust gas is trapped on the upper side of the filter plate 60. Due to the inclined arrangement of the filter plate 60, the particulate matter accumulates near the slag discharge port 62. The sealing cover 63 is opened, and the particulate matter is discharged from the filter box 1 through the slag discharge port 62. Since exhaust gas at different temperatures enters the filter box 1 through different air inlets 10, the exhaust gas is filtered through different positions of the filter plate 60, and the filter plate 60 is cleaned by blowing air, reducing clogging of the filter plate 60.

[0025] 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 waste gas treatment device for continuous polypropylene production, comprising a filter box (1) and an inlet pipe (2), wherein the inlet pipe (2) is connected to the filter box (1), and a cooling pipe (3) is provided inside the inlet pipe (2), characterized in that: The cooling pipe (3) includes a row of several cooling coils (301), which are connected in series by a connecting pipe (302). Adjacent cooling coils (301) are respectively provided with a partition (4) and a rotating cylinder (5). The partition (4) is fixed on the air inlet pipe (2), and the rotating cylinder (5) is rotatably mounted on the air inlet pipe (2). The closed end face of the rotating cylinder (5) slides in contact with the corresponding partition (4). A vent hole (6) is opened on the end face of the rotating cylinder (5), and the side of the partition (4) corresponds to the vent hole (6). 6) Ventilation slots (7) are opened respectively, and air outlets (8) are opened on the side of the rotating cylinder (5). Air outlet slots (9) are opened on the air inlet pipe (2) corresponding to the air outlets (8). The air outlet slots (9) are connected to the air inlet end of the filter box (1). A heat-sensing drive device is provided on the rotating cylinder (5). When the temperature inside the rotating cylinder (5) rises, the heat-sensing drive device drives the rotating cylinder (5) to rotate, so that the air outlet (8) and the air outlet slot (9) are first connected and then disconnected, and then the ventilation hole (6) is connected to the ventilation slot (7).

2. The waste gas treatment device for continuous polypropylene production according to claim 1, characterized in that: The thermal induction drive device includes a support shaft (20), which is fixed on the partition plate (4). A support ring (21) is slidably fitted on the outer periphery of the support shaft (20). The support ring (21) is connected to the rotating cylinder (5) through an elastic telescopic member. Several hot bimetallic strips (22) are fixed on the rotating cylinder (5). The movable end of the hot bimetallic strip (22) can push the support ring (21) to move axially along the support shaft (20). A guide groove (23) is opened on the support shaft (20). A slide rod (24) is slidably provided in the guide groove (23). The slide rod (24) is fixed on the support ring (21).

3. The waste gas treatment device for continuous polypropylene production according to claim 2, characterized in that: The support shaft (20), support ring (21), and hot bimetallic strip (22) are located in the reserved groove (30) on the end face of the rotating cylinder (5).

4. The waste gas treatment device for continuous polypropylene production according to claim 2, characterized in that: The elastic telescopic component includes a light rod (40), a socket (41) is opened on the support ring (21), the light rod (40) slides in the socket (41), the light rod (40) is fixedly connected to the rotating cylinder (5), and the light rod (40) is connected to the support ring (21) by a spring (42).

5. The waste gas treatment device for continuous polypropylene production according to claim 4, characterized in that: The spring (42) is fitted around the outer periphery of the smooth rod (40). One end of the spring (42) is fixedly connected to the support ring (21), and the other end is fixedly connected to the smooth rod (40).

6. The waste gas treatment device for continuous polypropylene production according to claim 1, characterized in that: An inclined filter plate (60) is fixedly installed inside the filter box (1). An exhaust hole (61) and a slag discharge port (62) are opened on the filter box (1). A sealing cover (63) is provided on the side of the slag discharge port (62). A support leg (64) is fixedly installed on the filter box (1).

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