A spray type polypropylene production tail gas recovery device

Abstract

The application relates to the technical field of ecological protection, in particular to a spraying type polypropylene production tail gas recovery device. The device comprises a support, the support is fixedly connected with a tank body, the tank body is provided with a spraying module and a filler layer, the bottom of the tank body is fixedly connected with a partition frame, the partition frame divides the bottom of the tank body into a plurality of cavities, the tank body is provided with a circulating assembly for recycling spraying liquid, the tank body is provided with a blocking assembly for blocking the cavities, and the cavities are provided with a transposition assembly for changing the position of suction spraying liquid. The bottom of the tank body is divided into a plurality of cavities through the partition frame, two cavities among the cavities are respectively in a receiving state and a discharging state of the spraying liquid, the remaining cavities are in a sedimentation state of impurities, and the state of the cavities is switched at a fixed time, that is, after the impurities in the spraying liquid in the cavities are precipitated, the spraying liquid is circulated, the probability of impurity blockage of the communicating pipe is reduced, and the maintenance frequency is reduced.

Description

Technical Field

[0001] This invention relates to the field of ecological protection technology, and in particular to a spray-type polypropylene production tail gas recovery device. Background Technology

[0002] The exhaust gas generated during polypropylene production typically contains unreacted propylene gas, volatile organic compounds (VOCs), suspended particulate matter, and small amounts of acidic or alkaline gases. If emitted directly without treatment, it will not only pollute the atmospheric environment but may also harm the balance of the ecosystem and human health. Therefore, the exhaust gas must undergo efficient purification treatment to ensure that it meets the standards before it can be discharged. Currently, spray towers are commonly used in industry to treat this type of waste gas, especially suitable for removing particulate matter, soluble organic matter, and harmful gases. Among them, circulating spray towers significantly improve purification efficiency because the spray liquid can be recycled, while reducing the consumption of spray liquid and the amount of wastewater generated. They have obvious advantages in energy conservation and emission reduction, which helps to promote green manufacturing and ecological environmental protection, and achieve a coordinated unity between economic benefits and sustainable environmental development.

[0003] During the operation of a circulating spray tower, spray liquid needs to be continuously drawn from the bottom of the tower for recycling. However, since the spray liquid carries a large amount of solid impurities during the absorption of pollutants, a filter device is usually installed at the bottom of the tower to intercept these impurities in order to prevent them from entering the circulation system and clogging the spray heads. Nevertheless, in long-term operation, the surface of the filter device is prone to clogging due to the accumulation of impurities, resulting in poor circulation of the spray liquid, affecting the purification effect, and requiring frequent shutdowns for cleaning, which reduces the continuity of system operation and processing efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a spray-type polypropylene production tail gas recovery device.

[0005] Technical Solution: A spray-type polypropylene production tail gas recovery device includes a support frame, a tank body fixedly connected to the support frame, an outlet pipe and an inlet pipe fixedly connected and connected to the top and side walls of the tank body respectively, a spray module and a packing layer disposed inside the tank body, a partition frame fixedly connected to the bottom of the tank body, the partition frame dividing the bottom of the tank body into several cavities, a drain pipe of the same number as the cavities fixedly connected to the bottom of the tank body, the drain pipes of the tank body communicating with the corresponding cavities, a circulation component for recycling the spray liquid disposed on the tank body, a sealing component for sealing the cavities disposed inside the tank body, and a displacement component for changing the position of the suction spray liquid disposed inside the cavities.

[0006] As a preferred embodiment of the present invention, the number of cavities is greater than or equal to three, which is used to extend the sedimentation time of impurities in the spray liquid.

[0007] As a preferred embodiment of the present invention, the circulation assembly includes a liquid delivery pump, which is fixedly connected to the bracket. A connecting pipe is fixedly connected through the tank. The output end of the liquid delivery pump is connected to the spray module through the connecting pipe. The tank is fixedly connected with the same number of connecting pipes as the cavities. The connecting pipes are connected to the corresponding cavities. The input end of the liquid delivery pump is fixedly connected to and connected to a connecting pipe. All the connecting pipes and the connecting pipes are fixedly connected to a four-way solenoid valve.

[0008] As a preferred embodiment of the present invention, the sealing assembly includes a servo motor, which is fixedly connected to the tank body. The output shaft of the servo motor is fixedly connected to a rotating shaft, which is rotatably connected to the tank body and rotatably connected to the partition frame. A sealing plate is fixedly connected to the rotating shaft, and the sealing plate has a fan-shaped notch for allowing the spray liquid to enter one of the cavities.

[0009] As a preferred embodiment of the present invention, the sealing plate is fixedly connected to a guide plate, the guide plate is located at the fan-shaped notch of the sealing plate, and there are gaps between the sealing plate and the tank body and the guide plate.

[0010] As a preferred embodiment of the present invention, both the sealing plate and the guide plate are provided with inclined surfaces on their upper sides for rapidly guiding the spray liquid.

[0011] As a preferred embodiment of the present invention, the tank and the partition frame are fixedly connected with the same number of wall-mounted frames as the cavity, and the wall-mounted frames are located at the top of the corresponding cavity to allow the spray liquid to flow along the inner wall of the cavity.

[0012] As a preferred embodiment of the present invention, the displacement assembly includes a fixed shaft, which is fixedly connected to the tank body. A float is slidably connected to the fixed shaft, and a suction head is fixedly connected to the float. The suction head is fixedly connected to the corresponding connecting pipe and connected to a flexible pipe. A backflushing assembly for backflushing itself is provided inside the suction head.

[0013] As a preferred embodiment of the present invention, the backflush assembly includes a backflush piston, the upper radius of the suction head is larger than the lower radius, the backflush piston is slidably connected to the upper part of the suction head, and an elastic element is provided between the backflush piston and the suction head.

[0014] As a preferred embodiment of the present invention, a trigger block is fixedly connected to the top of the fixed shaft, and the trigger block is used to push the adjacent backflush piston to slide along the pumping head.

[0015] The present invention has the following beneficial effects: 1. The present invention divides the bottom of the tank into several cavities by means of a partition frame, so that two of the cavities are in the receiving state and the discharge state of the spray liquid respectively, and the remaining cavities are in the sedimentation state of impurities. The state of the cavities is switched at regular intervals, that is, the impurities in the spray liquid in the cavity are precipitated and then the spray liquid is circulated, which reduces the probability of impurities clogging the connecting pipe and reduces the number of maintenance.

[0016] 2. The spraying liquid sprayed by the spraying module is guided by the sealing plate and the guide plate, so that the spraying liquid flows downward along the inner wall of the corresponding cavity and converges with the spraying liquid in the corresponding cavity, reducing the liquid surface disturbance caused by the spraying liquid entering the cavity and improving the sedimentation rate of impurities in the cavity.

[0017] 3. By using a float to drive the suction head to draw the spray liquid from top to bottom during the suction of the spray liquid in the cavity after sedimentation, the impurity content drawn during the circulation of the spray liquid is reduced, and the sedimentation time of impurities in the lower part of the spray liquid in the cavity is extended, thereby reducing the probability of the suction head being blocked.

[0018] 4. The float changes the position of the suction head, causing the trigger block to drive the backflush piston to push the spray liquid outward from the bottom of the suction head. The spray liquid backflushes the suction head, further reducing the probability of the suction head becoming blocked. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional cross-sectional view of the tank body of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the separator and cavity of the present invention;

[0022] Figure 4 This is a three-dimensional cross-sectional view of the partition frame of the present invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the sealing plate and the flow guide plate of the present invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the fixed shaft and float of the present invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the liquid extraction head of the present invention;

[0026] Figure 8 This is a three-dimensional cross-sectional view of the liquid extraction head of the present invention.

[0027] The components in the diagram are labeled as follows: 1-Support, 2-Tank, 3-Spray module, 4-Packing layer, 5-Separator, 6-Cavity, 201-Liquid delivery pump, 202-Connecting pipe, 203-Connecting pipe, 204-Connecting pipe, 205-Four-way solenoid valve, 301-Servo motor, 302-Rotating shaft, 303-Blocking plate, 304-Guide plate, 305-Wall-mounted bracket, 401-Fixed shaft, 402-Float, 403-Liquid extraction head, 404-Flexible tube, 501-Backflush piston, 502-Elastic element, 503-Trigger block. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] During the operation of the circulating spray tower, the spray liquid needs to be continuously drawn from the bottom of the tower for recycling. Since the spray liquid carries a large amount of solid impurities when absorbing pollutants, a filter device is usually installed at the bottom of the tower to intercept the impurities in order to prevent them from entering the circulation system and clogging the spray heads. However, after long-term operation, the filter device is prone to clogging due to the accumulation of impurities, resulting in poor flow of the spray liquid, affecting the purification efficiency, increasing the frequency of shutdown for cleaning, and reducing the continuity of system operation and processing efficiency.

[0030] Example 1: This example discloses a spray-type polypropylene production tail gas recovery device for purifying polypropylene tail gas.

[0031] like Figures 1-4 As shown, the system includes a support 1, to which a tank 2 is fixedly connected. The top and side walls of the tank 2 are respectively fixedly connected to and connected to an outlet pipe and an inlet pipe. The outlet pipe is used to discharge the purified gas, and the inlet pipe is used to inject the exhaust gas generated during the preparation of polypropylene (hereinafter, the term "exhaust gas" will be used directly in the description) into the tank 2. The tank 2 contains two spray modules 3 and two packing layers 4, which are staggered, with the spray module 3 located at the top. A partition frame 5 is fixedly connected to the bottom of the tank 2, and the inlet pipe is located above the partition frame 5. 5. The bottom of the tank 2 is divided into several cavities 6, with three or more cavities 6, to prolong the sedimentation time of impurities in the spray liquid. In this application, there are three cavities 6: front, back, and right. The bottom of the tank 2 is fixedly connected with the same number of drain pipes as the cavities 6. The three drain pipes of the tank 2 are connected to the corresponding cavities 6. The drain pipes are used to discharge the solid impurities deposited in the corresponding cavities 6. The tank 2 is equipped with a circulation component for recycling the spray liquid. The tank 2 is equipped with a sealing component for sealing the cavities 6. The cavities 6 are equipped with a displacement component for changing the position of the suction spray liquid.

[0032] like Figures 1-3 and Figure 6 As shown, the circulation assembly includes a liquid delivery pump 201, which is fixedly connected to the right side of the bracket 1. A connecting pipe 202 is fixedly connected through the tank 2. The output end of the liquid delivery pump 201 is connected to both spray modules 3 through the connecting pipe 202. Three connecting pipes 203 are fixedly connected to the bottom of the tank 2, with a certain distance between the connecting pipes 203 and the bottom of the tank 2 to allow space for impurities to settle. The three connecting pipes 203 are respectively connected to the corresponding cavities 6. The input end of the liquid delivery pump 201 is fixedly connected to and connected to a connecting pipe 204, which is a T-shaped pipe. This is used to connect the three connecting pipes 203 to the connecting pipe 202 via the liquid delivery pump 201, and also to inject spray liquid through the connecting pipe 204. All connecting pipes 203 and connecting pipes 204 are fixedly connected to a four-way solenoid valve 205. The four-way solenoid valve 205 is used to control the connection between any one of the connecting pipes 203 and the connecting pipe 204. The spray liquid in the cavity 6 can enter the two spray modules 3 along the connecting pipes 203, the four-way solenoid valve 205, the connecting pipe 204, the liquid delivery pump 201 and the connecting pipe 202, and then fall into the cavity 6 from the spray modules 3. This process is the recycling of the spray liquid.

[0033] like Figures 3-5 As shown, the sealing assembly includes a servo motor 301, which is fixedly connected to the bottom of the tank 2. The output shaft of the servo motor 301 is fixedly connected to a rotating shaft 302, which is rotatably connected to the bottom of the tank 2. The rotating shaft 302 is rotatably connected to the partition frame 5. A sealing plate 303 that fits against the top of the partition frame 5 is fixedly connected to the rotating shaft 302. The sealing plate 303 has a fan-shaped notch, which can simultaneously seal two cavities 6, allowing the spray liquid sprayed from the spray module 3 to enter one of the cavities 6. Initially, the sealing plate 303 seals both the front and rear cavities 6, and both cavities 6 are filled with spray liquid, while the right-side cavity 6 is empty. At the same time, the connecting pipe 204 is connected to the front connecting pipe 203 through a four-way solenoid valve 205. The sealing plate 303 is fixed. A guide plate 304 is connected to the tank 2, which is located at the fan-shaped opening of the sealing plate 303. There is a gap between the sealing plate 303 and the tank 2 and the guide plate 304. The overall trajectory of the gap is fan-shaped, which is used to allow the spray liquid falling from the spray module 3 to flow downward along the inner wall of the cavity 6 and converge with the spray liquid in the cavity 6. The upper side of the sealing plate 303 and the guide plate 304 are provided with inclined surfaces for quickly guiding the spray liquid into the cavity 6. The tank 2 and the partition frame 5 are fixedly connected with the same number of wall-mounted frames 305 as the cavity 6. The top and bottom of the wall-mounted frames 305 are provided with inclined surfaces. The wall-mounted frames 305 are located at the top of the corresponding cavity 6, which is used to allow the spray liquid to flow along the inclined surface of the wall-mounted frames 305 and flow along the wall-mounted frames 305 to the inner wall of the cavity 6, so that the spray liquid flows along the inner wall of the cavity 6.

[0034] Working principle: When exhaust gas needs to be recovered, the exhaust gas is injected into the tank 2 through the inlet pipe. At the same time, the liquid delivery pump 201 is turned on. The liquid delivery pump 201 draws the spray liquid in the front chamber 6, so that the spray liquid enters the connecting pipe 204 through the adjacent connecting pipe 203, and enters the connecting pipe 202 through the liquid delivery pump 201. The spray liquid in the connecting pipe 202 enters the two spray modules 3. The spray modules 3 spray out the spray liquid, which falls downward. During this process, some of the spray liquid adheres to the packing layer 4. The exhaust gas passes through the two packing layers 4 and is finally discharged through the exhaust pipe at the top of the tank 2. During this process, the particulate matter and acidic gas in the exhaust gas are dissolved in the spray liquid and fall downward into the right chamber 6. This cycle continues until the spray liquid in the front chamber 6 is drawn to the bottom, and the spray liquid in the right chamber 6 is full.

[0035] When the spray liquid in the right cavity 6 is full, the output shaft of the servo motor 301 drives the sealing plate 303 to rotate via the rotating shaft 302, so that the sealing plate 303 changes from sealing the front and rear cavities 6 to sealing the right rear cavities 6. At this time, the front cavity 6 is in the spray liquid receiving state. At the same time, the four-way solenoid valve 205 switches the connection direction, so that the connecting pipe 203 on the rear side is connected to the connecting pipe 204. At this time, solid particles and other impurities in the spray liquid in the right cavity 6 begin to settle downwards, and the spray liquid in the rear cavity 6 begins to enter the spray module 3 and flow downwards into the front cavity 6. After the spray liquid in the rear cavity 6 purifies the exhaust gas and is transferred to the front cavity 6, the output shaft of the servo motor 301 drives the sealing plate 303 to rotate via the rotating shaft 302, so that the sealing plate 303 changes from sealing the front and rear cavities 6 to sealing the rear cavity 6. The blocking plate 303 transforms the two right cavities 6 from being blocked after the blockage to being blocked before the blockage, causing impurities in the spray liquid in the front cavity 6 to begin to settle downwards. The four-way solenoid valve 205 connects the connecting pipe 203 on the right side with the connecting pipe 204, and the rear cavity 6 is in the spray liquid receiving state. This cycle continues. The bottom of the tank 2 is divided into several cavities 6 by the partition frame 5, so that two of the cavities 6 are in the spray liquid receiving and discharging state, and the remaining cavities 6 are in the impurity settling state. That is, the impurities in the spray liquid in the cavities 6 are settled before circulation, reducing the probability of impurities clogging the connecting pipe 203 and reducing the number of maintenance times of the device. When it is necessary to stop the purification of the tail gas, the liquid delivery pump 201 is turned off to stop the injection of tail gas. When it is necessary to purify the tail gas again, the above steps are repeated.

[0036] During the above process, the spray liquid sprayed by the spray module 3 falls onto the upper side of the sealing plate 303 and the guide plate 304. The spray liquid flows along the inclined surface of the sealing plate 303 and the guide plate 304, and enters the corresponding cavity 6 through the gap formed between the sealing plate 303 and the tank 2 and the guide plate 304. The spray liquid flows downward along the gap and follows the inner wall of the cavity 6 under the guidance of the wall-adhering frame 305, that is, the outside of the partition frame 5 and the tank 2, and flows downward to the spray liquid in the corresponding cavity 6. The spray liquid sprayed by the spray module 3 is guided by the sealing plate 303 and the guide plate 304, so that the spray liquid adheres to the inner wall of the corresponding cavity 6 and flows downward, and converges with the spray liquid in the corresponding cavity 6, reducing the liquid surface disturbance caused by the spray liquid entering the cavity 6 and increasing the sedimentation rate of impurities in the cavity 6.

[0037] When impurities accumulate to a certain height in cavity 6, they need to be cleaned (the height of the accumulated impurities should not exceed the height of the corresponding connecting pipe 203). There are two cleaning methods: First, perform a comprehensive shutdown cleaning, which can simultaneously clean the impurities in the three cavities 6, allowing the spray liquid to carry the impurities out along the drain pipe at the bottom, and inject fresh spray liquid through the connecting pipe 204. Second, perform a non-shutdown cleaning. After the spray liquid in the cavity 6 where the impurities need to be cleaned is pumped out, the sealing plate 303 does not change the two cavities 6 it seals, and the four-way solenoid valve 205 is switched to the state of connection with the connecting pipe 203 in the cavity 6 that is in the spray liquid receiving state, and directly circulates until the impurities in the cavity 6 where the impurities need to be cleaned are processed. Then, according to the above steps, the spray liquid receiving state of the cavity 6 is opened in sequence, and the impurities in the remaining cavities 6 are cleaned in the same way until the cleaning is completed.

[0038] Example 2: This example discloses a spray-type polypropylene production tail gas recovery device, which is a further improvement on Example 1.

[0039] like Figure 3 , Figure 6 and Figure 7 As shown, the transposition assembly includes a fixed shaft 401, which is fixedly connected to the bottom of the tank 2. A float 402 is slidably connected to the fixed shaft 401. The float 402 is in the sliding range of the fixed shaft 401, and its top does not exceed the upper side of the partition frame 5, and its bottom does not fall below the height of the connecting pipe 203. The float 402 is made of polyethylene. A liquid extraction head 403 is fixedly connected to the float 402. The lower part of the liquid extraction head 403 is provided with evenly distributed through holes, and the lower part of the liquid extraction head 403 is wrapped with a filter cloth (not shown in the figure) for blocking impurities. The bottom of the liquid extraction head 403 is fixedly connected to the corresponding connecting pipe 203 and connected with a flexible pipe 404. A backwashing assembly for backwashing itself is provided inside the liquid extraction head 403.

[0040] like Figure 3 and Figures 6-8 As shown, the backflushing assembly includes a backflushing piston 501. The upper radius of the suction head 403 is larger than the lower radius, which increases the amount of spray liquid pushed by the backflushing piston 501. This is used to increase the impact force of the spray liquid pushed by the backflushing piston 501 against the suction head 403, and reduce the probability of the suction head 403 becoming blocked. The backflushing piston 501 is slidably connected to the top of the suction head 403. An elastic element 502, which is a tension spring, is provided between the backflushing piston 501 and the suction head 403 to drive the backflushing piston 501 to reset. A trigger block 503 is fixedly connected to the top of the fixed shaft 401. The trigger block 503 is used to push the adjacent backflushing piston 501 to slide along the suction head 403, thereby causing the backflushing piston 501 to push the spray liquid to backflush the filter cloth outside the suction head 403.

[0041] Working principle: When the liquid delivery pump 201 needs to circulate the spray liquid in the corresponding cavity 6, the spray liquid in the corresponding cavity 6 enters through the suction head 403 and enters the corresponding connecting pipe 203 along the flexible pipe 404. Initially, since the spray liquid in the cavity 6 is full, the float 402 is at the top of the fixed shaft 401 under the action of the spray liquid. As the liquid delivery pump 201 gradually draws the spray liquid in the cavity 6, the liquid level in the cavity 6 gradually drops. At the same time, the float 402 drives the suction head 403 on it to gradually drop with the liquid level, so that the position of the suction head 403 gradually changes with the liquid level. That is, the suction head 403 draws the spray liquid in the corresponding cavity 6 from top to bottom. After a certain period of sedimentation, the cavity... The spray liquid inside cavity 6 has a lower impurity content in the upper part of the spray liquid, which reduces the probability of blockage of the suction head 403 and prolongs the sedimentation time of impurities in the lower part of the spray liquid inside cavity 6. This continues until the float 402 slides to the bottom of the fixed shaft 401 (the float 402 at this position is a certain distance from the bottom of the tank 2, which is used for the sedimentation of impurities). When cavity 6 is in the receiving state of spray liquid flow, the liquid level of the spray liquid inside cavity 6 gradually rises. The liquid level drives the float 402 to slide upward along the fixed shaft 401. This continues until the spray liquid inside cavity 6 is full. The float 402 drives the suction head 403 to return to the top of the fixed shaft 401. When it is necessary to suction the spray liquid in cavity 6 again, the above steps are repeated.

[0042] During the process where the float 402 drives the suction head 403 to move with the liquid surface inside the cavity 6, as the float 402 drives the suction head 403 downward, the recoil piston 501 inside the suction head 403 gradually separates from the trigger block 503. During the suction process of the liquid delivery pump 201, a negative pressure is formed inside the suction head 403. This negative pressure force overcomes the pulling force of the elastic element 502, preventing the recoil piston 501 from returning to its original position. When the cavity 6 is in the state of receiving spray liquid, the suction head 403 inside the cavity 6 is not subject to the suction action of the liquid delivery pump 201. At this moment, the elastic element 502 drives the recoil piston 501. As the spray liquid accumulates inside the cavity 6, the float 402 drives the suction head 403 to move upward along the fixed shaft 401. The suction head 403 drives the internal backwash piston 501 to move synchronously until the backwash piston 501 contacts the trigger block 503. The trigger block 503 pushes the backwash piston 501 to move downward along the suction head 403. At the same time, the elastic element 502 is stretched, and the backwash piston 501 pushes the spray liquid to flow from the inside of the suction head 403 to the outside, backwashing the impurities on the external filter cloth of the suction head 403 and separating the impurities attached to the external filter cloth of the suction head 403.

[0043] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spray type polypropylene production tail gas recovery device, comprising a support (1), a tank body (2) is fixedly connected to the support (1), an air outlet pipe and an air inlet pipe are fixedly connected to and communicated with the top and the side wall of the tank body (2) respectively, a spray module (3) and a filler layer (4) are arranged in the tank body (2), characterized in that, The bottom of the tank body (2) is fixedly connected with a partition frame (5), the partition frame (5) divides the bottom of the tank body (2) into a plurality of cavities (6), the bottom of the tank body (2) is fixedly connected with a plurality of blowdown pipes which are the same in number as the cavities (6), the blowdown pipes of the tank body (2) are in communication with the corresponding cavities (6), the tank body (2) is provided with a circulating assembly for recycling the spraying liquid, the tank body (2) is provided with a blocking assembly for blocking the cavities (6), and the cavities (6) are provided with a transposition assembly for changing the position of the suction spraying liquid. The circulating assembly comprises a liquid sending pump (201), the liquid sending pump (201) is fixedly connected to the support (1), the tank body (2) is fixedly connected with a butt joint pipe (202) in a penetrating manner, the output end of the liquid sending pump (201) is in communication with the spraying module (3) through the butt joint pipe (202), the tank body (2) is fixedly connected with a plurality of communication pipes (203) which are the same in number as the cavities (6), the communication pipes (203) are in communication with the corresponding cavities (6), the input end of the liquid sending pump (201) is fixedly connected and in communication with a connecting pipe (204), and all the communication pipes (203) and the connecting pipe (204) are fixedly connected with a four-way electromagnetic valve (205). The blocking assembly comprises a servo motor (301), the servo motor (301) is fixedly connected to the tank body (2), the output shaft of the servo motor (301) is fixedly connected with a rotating shaft (302), the rotating shaft (302) is rotatably connected to the tank body (2) in a penetrating manner, the rotating shaft (302) is rotatably connected with the partition frame (5) in a penetrating manner, and the rotating shaft (302) is fixedly connected with a blocking plate (303), the blocking plate (303) has a fan-shaped opening for allowing the spraying liquid to enter one of the cavities (6). The transposition assembly comprises a fixed shaft (401), the fixed shaft (401) is fixedly connected to the tank body (2), the fixed shaft (401) is slidably connected with a float (402), the float (402) is fixedly connected with a liquid suction head (403), the liquid suction head (403) is fixedly connected and in communication with the corresponding communication pipe (203) through a flexible pipe (404), and the liquid suction head (403) is provided with a backflushing assembly for backflushing itself.

2. A spray-type polypropylene production off-gas recovery apparatus according to claim 1, characterized in that The number of the cavities (6) is greater than or equal to three, so as to prolong the sedimentation time of impurities in the spraying liquid.

3. A spray-type polypropylene production off-gas recovery apparatus according to claim 1, characterized in that, The blocking plate (303) is fixedly connected with a flow guide plate (304), the flow guide plate (304) is located at the fan-shaped opening of the blocking plate (303), and there is a gap between the blocking plate (303) and the tank body (2) and the flow guide plate (304).

4. A spray-type polypropylene production off-gas recovery apparatus according to claim 3, characterized in that The upper sides of the blocking plate (303) and the flow guide plate (304) are provided with inclined surfaces for quickly guiding the spraying liquid.

5. A spray-type polypropylene production off-gas recovery apparatus according to claim 3, characterized in that The tank body (2) is fixedly connected with the partition frame (5) and has the same number of wall-attached frames (305) as the cavities (6), the wall-attached frames (305) are located at the top of the cavities (6) and are used for making the spraying liquid flow along the inner wall of the cavities (6).

6. A spray-type polypropylene production off-gas recovery apparatus according to claim 1, characterized in that The backflush assembly comprises a backflush piston (501), the upper part of the liquid pumping head (403) has a larger radius than the lower part, the backflush piston (501) is sealingly and slidingly connected to the upper part of the liquid pumping head (403), and an elastic member (502) is arranged between the backflush piston (501) and the liquid pumping head (403).

7. A spray-type polypropylene production off-gas recovery apparatus according to claim 6, characterized in that The top of the fixed shaft (401) is fixedly connected with a trigger block (503), and the trigger block (503) is used for pushing the adjacent backflush piston (501) to slide along the liquid pumping head (403).

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