A phosphine gas recovery apparatus

Abstract

The utility model discloses a kind of phosphine gas recovery devices, belong to gas recovery technical field, including tank body;The tank body top vertical sealing is installed with inlet pipe, the tank body is horizontally fixed and is installed with baffle, and baffle top vertical rotation is installed with main gas pipe, and the main gas pipe is connected with rotary exhaust component, the main gas pipe outer wall is horizontally symmetrical and is installed with mounting bracket, and vertical stirring assembly is equipped between two mounting brackets;The main gas pipe outer wall is horizontally rotatably installed with rotating rod, and rotating rod is equipped with up-down stirring assembly;Thus, it can be through the collaborative design of rotary exhaust component and three-dimensional stirring system, main gas pipe drives auxiliary gas pipe to rotate exhaust, cooperate the up-down convection of first stirring vane and the horizontal convection of second stirring vane, make the contact area and contact time of phosphine gas and spray liquid greatly improve, solve the problem of reaction insufficient and gas dissipation caused by traditional fixed exhaust and single stirring.

Description

Technical Field

[0001] This utility model relates to a phosphine gas recovery device, belonging to the field of gas recovery technology. Background Technology

[0002] Phosphine (PH3) is a key chemical raw material with wide applications in industrial synthesis. At the same time, due to its highly effective insecticidal properties, it is widely used in fumigation operations in grain storage, tobacco storage, and the preservation of Chinese medicinal materials, making it an important substance for ensuring the safety of agricultural product storage.

[0003] However, phosphine is highly toxic, and leaks can cause serious damage to the human respiratory and nervous systems, with long-term exposure even being life-threatening. Furthermore, this gas is flammable and explosive; when it reaches a certain concentration in the air, it can easily explode upon contact with an open flame or static electricity, posing a significant safety hazard. In addition, the direct emission of phosphine-containing waste gas generated after fumigation operations will not only cause air pollution and damage the ecological environment but also lead to a waste of phosphine resources, contradicting the current requirements for green, low-carbon, and resource-recycling industrial development.

[0004] To address the aforementioned issues, research and development of phosphine gas recovery devices has been undertaken in related technical fields. For example, Chinese Patent CN220386208U discloses a recovery device comprising a gas delivery pipeline, a fan, a purification mechanism, a phosphine absorption tank, and an ozone generator. This device connects to the grain depot's gas outlet via a gas delivery pipeline. The fan sends the phosphine-containing mixed gas into the purification mechanism for pretreatment, removing dust and other impurities. The gas then enters the phosphine absorption tank to undergo an oxidation-reduction reaction with ozone. The generated phosphoric acid mist is condensed and collected by a demister, and the residual gas is purified by an activated carbon adsorption layer before being discharged, achieving partial recovery of phosphine and purification of the exhaust gas.

[0005] However, existing technologies still have significant shortcomings, especially in the core process of waste gas treatment where efficiency is lacking. Specifically, the aforementioned patents and similar devices generally rely solely on a single spraying method to separate impurities and purify gas during the adsorption of phosphine-containing waste gas. Limited by the contact area, contact time, and flow state between the spray liquid and the gas, the spraying effect is significantly limited. This not only leads to incomplete impurity removal, affecting the efficiency of subsequent oxidation reactions and the purity of phosphate products, but also prevents the full adsorption of residual phosphine gas, with some gas potentially still being emitted with the exhaust gas. This makes it difficult to meet increasingly stringent environmental and safety standards. Therefore, there is an urgent need to optimize and upgrade the treatment structure of existing devices to improve phosphine recovery efficiency and exhaust gas purification effects. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a phosphine gas recovery device to solve the issues raised in the background section.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a phosphine gas recovery device, including a tank; an air inlet pipe is vertically sealed and installed through the top of the tank, a partition is horizontally fixedly installed inside the tank, and a main gas pipe is vertically rotatably installed through the top of the partition, and a rotary exhaust assembly is connected to the main gas pipe. The main air pipe is symmetrically mounted with mounting brackets on its outer wall, and a vertical stirring assembly is provided between the two mounting brackets; a rotating rod is rotatably mounted on the outer wall of the main air pipe, and an upper and lower stirring assembly is provided on the rotating rod. An exhaust pipe is installed through the top of the tank, and a baffle plate is installed through the bottom of the exhaust pipe. A waste liquid discharge pipe is installed at the bottom of the tank, and a valve is installed on the waste liquid discharge pipe. The rotary exhaust assembly includes an auxiliary air pipe, a motor, a first gear, and a second gear. Multiple sets of auxiliary air pipes are horizontally connected to the outer wall of the main air pipe, and each set of auxiliary air pipes has multiple exhaust holes. A second gear is fixedly sleeved on the main air pipe and is located at the top of the partition. A motor is fixedly installed at the top of the tank body, and a first gear is installed at the output end of the motor. The first gear meshes with the second gear.

[0008] Preferably, the bottom of the air intake pipe is connected to a cyclone connector, and the bottom of the cyclone connector is connected to the top of the main air pipe.

[0009] Preferably, the vertical stirring assembly includes a drive rod, a first rubber wheel, and a first stirring blade. The drive rod is vertically rotatably mounted between the two mounting brackets, and multiple sets of first stirring blades are mounted on the drive rod. The first rubber wheel is fixedly mounted on the top of the drive rod, and the first rubber wheel rolls in contact with the inner wall of the tank.

[0010] Preferably, the end of the auxiliary air pipe furthest from the main air pipe is located between the two sets of first stirring blades.

[0011] Preferably, the upper and lower stirring assembly includes a second stirring blade, an annular track, and a second rubber wheel. An annular track is fixedly installed on the inner wall of the tank. A second rubber wheel is fixedly installed at the end of the rotating rod, and the second rubber wheel rolls in cooperation with the top of the annular track to drive the rotating rod to rotate. Multiple sets of second stirring blades are installed on the rotating rod.

[0012] Preferably, the rotating rod is located between two sets of auxiliary air pipes distributed vertically.

[0013] Preferably, a scraper is horizontally mounted at the bottom of the mounting bracket, and the scraper is used to clean the bottom of the tank and discharge the waste liquid from the waste liquid discharge pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: through the coordinated design of the rotary exhaust component and the three-dimensional stirring system, the main gas pipe drives the auxiliary gas pipe to rotate and exhaust, and with the vertical convection of the first stirring blade and the horizontal convection of the second stirring blade, the contact area and contact time between phosphine gas and spray liquid are greatly improved, which solves the problems of insufficient reaction and gas escape caused by traditional fixed exhaust and single stirring. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic cross-sectional view of the tank body of this utility model; Figure 3 This is a schematic diagram of the side sectional view of the tank body of this utility model; Figure 4 This is a schematic diagram of the internal structure of the tank body of this utility model; Figure 5 This is a bottom view of the internal structure of the tank body of this utility model.

[0017] In the diagram: 1. Tank body; 2. Baffle plate; 3. Main air pipe; 4. Auxiliary air pipe; 5. Motor; 6. First gear; 7. Second gear; 8. Cyclone connector; 9. Air inlet pipe; 10. Mounting bracket; 11. Drive rod; 12. First rubber wheel; 13. First stirring blade; 14. Rotating rod; 15. Second stirring blade; 16. Circular track; 17. Second rubber wheel; 18. Exhaust pipe; 19. Waste liquid discharge pipe; 20. Scraper. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-5This utility model provides a technical solution: a phosphine gas recovery device, including a tank 1; an air inlet pipe 9 is vertically sealed and installed through the top of the tank 1, a partition 2 is horizontally fixedly installed inside the tank 1, and a main gas pipe 3 is vertically rotatably installed through the top of the partition 2, and a rotary exhaust assembly is connected to the main gas pipe 3. Mounting brackets 10 are horizontally and symmetrically installed on the outer wall of the main air pipe 3, and a vertical stirring assembly is provided between the two mounting brackets 10; a rotating rod 14 is horizontally and rotatably installed on the outer wall of the main air pipe 3, and an upper and lower stirring assembly is provided on the rotating rod 14. A vent pipe 18 is installed through the top of the tank body 1, and a partition plate 2 is installed through the bottom of the vent pipe 18. A waste liquid discharge pipe 19 is installed at the bottom of the tank body 1, and a valve is installed on the waste liquid discharge pipe 19. The rotary exhaust assembly includes an auxiliary air pipe 4, a motor 5, a first gear 6, and a second gear 7. Multiple sets of auxiliary air pipes 4 are horizontally connected to the outer wall of the main air pipe 3, and each set of auxiliary air pipes 4 has multiple exhaust holes. The second gear 7 is fixedly sleeved on the main air pipe 3 and is located at the top of the partition plate 2. The motor 5 is fixedly installed at the top inside the tank body 1, and the first gear 6 is installed at the output end of the motor 5. The first gear 6 meshes with the second gear 7. In this embodiment of the invention, when the device is started, the motor 5 fixed at the top of the tank 1 is first powered on and runs. The output shaft of the motor drives the first gear 6, which is fixed on the same axis, to rotate clockwise or counterclockwise. Since the first gear 6 and the second gear 7 fixedly sleeved on the outer wall of the main air pipe 3 are externally meshed, the second gear 7, under the meshing driving force of the first gear 6, drives the main air pipe 3 to rotate around its own vertical axis in the through hole of the partition 2. A sealed bearing is provided between the partition 2 and the main air pipe 3 to ensure smooth rotation of the main air pipe and to prevent the spray liquid from leaking to the top of the partition. At the same time, the mixed waste gas containing phosphine is input through the air inlet pipe 9 sealed and installed at the top of the tank 1, flows along the inner wall of the air inlet pipe to the top of the main air pipe 3, and then enters the interior of the main air pipe 3. 3-5 sets of auxiliary air pipes 4 are evenly and horizontally connected along the circumference of the outer wall of the main air pipe 3. The waste gas is partially distributed to each set of auxiliary air pipes 4 inside the main air pipe, and each set of auxiliary air pipes 4 is discharged into the spray liquid inside the tank 1. Compared to the fixed single-pipe exhaust method in the prior art, this embodiment uses a rotating exhaust structure driven by a motor and gears to enable the exhaust gas to form a 360° dispersed exhaust without dead angles within the tank 1. The bubble coverage extends from the center of the tank to near the inner wall, significantly increasing the contact area between the exhaust gas and the spray liquid. At the same time, the rotation of the main gas pipe 3 drives the auxiliary gas pipe 4 to move synchronously, and the bubbles have a longer movement path in the spray liquid, effectively solving the problem of local gas accumulation in the existing device. For highly toxic phosphine gas, more sufficient contact can improve its absorption efficiency by the spray liquid, reduce the residual amount of phosphine in the subsequent exhaust gas, reduce the risk of air pollution, and improve the recovery rate of phosphine resources.

[0020] Please see Figure 1 Furthermore, the bottom of the air intake pipe 9 is connected to a cyclone connector 8, and the bottom of the cyclone connector 8 is connected to the top of the main air pipe 3. In this embodiment of the invention, the bottom of the intake pipe 9 is sealed to the fixed end of the cyclone connector 8 via a flange. An acid and alkali resistant rubber gasket is provided between the fixed end of the cyclone connector 8 and the intake pipe to ensure an airtight seal. The rotating end of the cyclone connector 8 is fixedly connected to the top of the main air pipe 3 by welding. When the main air pipe 3 rotates around its own axis under the drive of the second gear 7, the rotating end of the cyclone connector 8 rotates synchronously with the main air pipe 3, while the fixed end remains relatively stationary with the intake pipe 9. The cyclone connector has two sets of symmetrically distributed wear-resistant sealing rings inside. The sealing rings respectively fit the contact surfaces of the fixed end and the rotating end, forming a dynamic seal during rotation. This allows the rotating end to rotate freely while preventing gas from leaking from the gaps in the contact surfaces. During this process, the exhaust gas enters the fixed end of the cyclone connector from the intake pipe 9, smoothly transitions to the rotating end through the internal channel, and finally flows into the main air pipe 3, with no gas retention or leakage throughout the process. The cyclone connector 8 precisely resolves the motion conflict between the fixed inlet pipe and the rotating main pipe, achieving compatibility between the two motion states; phosphine is a highly toxic gas, and even a small leak can endanger the health of operators. The dynamic sealing structure of the cyclone connector can control the leakage rate, greatly improving the safety of the device.

[0021] Please see Figure 5 Furthermore, the vertical stirring assembly includes a drive rod 11, a first rubber wheel 12 and a first stirring blade 13. The drive rod 11 is vertically rotatably mounted between the two mounting brackets 10, and multiple sets of first stirring blades 13 are mounted on the drive rod 11. The first rubber wheel 12 is fixedly mounted on the top of the drive rod 11, and the first rubber wheel 12 rolls with the inner wall of the tank 1. In this embodiment of the present invention, two sets of mounting brackets 10 are symmetrically welded to the outer wall of the main air pipe 3 along the circumferential direction. The mounting brackets 10 are made of stainless steel angle steel and have reinforcing ribs at the welding points with the main air pipe 3 to improve the load-bearing capacity. A drive rod 11 is vertically rotatably mounted between the two sets of mounting brackets 10 through a sealed bearing. A first rubber wheel 12 is fixedly mounted at the top of the drive rod 11 through a key connection. The rubber wheel 12 is made of nitrile rubber and has anti-slip texture on its surface. The outer circumferential surface of the first rubber wheel 12 is tightly fitted to the inner wall of the tank 1. When the main air pipe 3 drives the mounting brackets 10 to revolve around the axis of the main air pipe, static friction is generated between the first rubber wheel 12 and the inner wall of the tank 1. This friction drives the first rubber wheel 12 to rotate around the axis of the drive rod 11. Since the first rubber wheel 12 is fixedly connected to the drive rod 11, the drive rod 11 rotates synchronously with the rubber wheel, thereby driving 3-5 sets of first stirring blades 13 evenly distributed along the length of the rod to rotate around the axis of the drive rod, thus stirring the spray liquid in the tank 1 vertically. The vertical stirring assembly in this embodiment does not require an additional power source such as a motor. It is driven entirely by the revolution of the main air pipe 3. When the spiral first stirring blade 13 rotates, it can form strong vertical convection, breaking the stratification of the spray liquid. At the same time, the convection motion can further disperse the bubbles discharged from the auxiliary air pipe 4, increasing the contact surface area between the bubbles and the spray liquid, and improving the absorption efficiency of phosphine.

[0022] Please see Figure 4 Furthermore, the end of the auxiliary air pipe 4 furthest from the main air pipe 3 is located between the two sets of first stirring blades 13; In an embodiment of this utility model, each set of auxiliary air pipes 4 on the outer wall of the main air pipe 3 extends horizontally, and the height of the end away from the main air pipe 3 is exactly between the two sets of first stirring blades 13 distributed vertically on the same drive rod 11. When the main air pipe 3 drives the auxiliary air pipe 4 to rotate and exhaust, the exhaust gas is discharged from the exhaust hole of the auxiliary air pipe 4, and the formed bubbles directly enter the area between the two sets of first stirring blades 13. At the same time, the first stirring blades 13 rotate around the axis of the drive rod under the drive of the drive rod 11, which can turn the bubbles upward. The two sets of stirring blades work together to form a local vortex around the bubbles, which prolongs the residence time of the bubbles in this area and fully mixes them with the spray liquid.

[0023] This embodiment achieves the synchronous effect of exhaust and stirring by matching the positions of the auxiliary air pipe and the stirring blades. As soon as the bubbles are discharged from the auxiliary air pipe 4, they are immediately within the stirring range of the two sets of first stirring blades 13, avoiding the lag problem in the prior art where the bubbles float a certain distance before contacting the stirring, and greatly shortening the time between the bubbles and the spray liquid.

[0024] Please see Figure 4 Furthermore, the upper and lower stirring assembly includes a second stirring blade 15, an annular track 16, and a second rubber wheel 17. An annular track 16 is fixedly installed on the inner wall of the tank body 1. The second rubber wheel 17 is fixedly installed at the end of the rotating rod 14, and the second rubber wheel 17 rolls with the top of the annular track 16 to drive the rotating rod 14 to rotate. Multiple sets of second stirring blades 15 are installed on the rotating rod 14. In this embodiment of the present invention, a ring track 16 is welded and fixed to the inner wall of the tank 1 near the top. A rotating rod 14 is evenly installed on the outer wall of the main air pipe 3 along the circumferential direction. The rotating rod 14 is a stainless steel round tube with a length adapted to the radius of the tank. It is rotatably connected to the main air pipe through a sealed bearing and can rotate around its own horizontal axis. A second rubber wheel 17 is fixedly installed at the end of the rotating rod 14 away from the main air pipe 3 through a bushing. The second rubber wheel 17 is in close contact with the top of the ring track 16. When the main air pipe 3 rotates, it drives the rotating rod 14 to revolve around the axis of the main air pipe. The second rubber wheel 17 rotates at the top of the ring track 16. The friction force generated by the track on the rubber wheel drives the second rubber wheel 17 to rotate around the axis of the rotating rod 14. This, in turn, drives 2-3 sets of second stirring blades 15 evenly distributed along the length of the rotating rod 14 to rotate around the axis of the rotating rod, thereby stirring the spray liquid in the horizontal direction. In this embodiment, the upper and lower stirring components, together with the aforementioned vertical stirring component, form a three-dimensional stirring system. The vertical stirring component is responsible for convection in the vertical direction, while the upper and lower stirring components are responsible for convection in the horizontal direction. The two work together to cover most of the space inside the tank 1, completely eliminating the blind spots of traditional stirring and improving the gas-liquid mixing effect.

[0025] Please see Figure 4 Furthermore, the rotating rod 14 is located between two sets of auxiliary air pipes 4 distributed vertically. In the embodiment of this utility model, when the main air pipe 3 drives the upper and lower auxiliary air pipes 4 to rotate and exhaust, the rotating rod 14 located between the two auxiliary air pipes 4 revolves synchronously and rotates on its own axis. The second stirring blade 15 on the rotating rod 14 forms a transverse stirring zone between the two auxiliary air pipes 4. The gas discharged from the upper auxiliary air pipe 4 diffuses downward and the gas discharged from the lower auxiliary air pipe diffuses upward, both of which must pass through the stirring area of ​​the second stirring blade 15. By matching the positions of the rotating rod 14 and the auxiliary gas pipe 4, the gases discharged from both the upper and lower auxiliary gas pipes can be fully utilized by the second stirring blade 15, avoiding the limitation that the upper and lower gases do not interfere with each other and react independently; at the same time, the stirring belt can further mix the gas and spray liquid in the vertical direction, reduce the stratification of gas in the vertical direction, improve the overall reaction efficiency in the tank 1, and ensure that phosphine at different heights can be effectively recovered.

[0026] Please see Figure 5 Furthermore, a scraper 20 is horizontally mounted at the bottom of the mounting bracket 10, and the scraper 20 is used to clean the bottom of the tank 1 and discharge the waste liquid from the waste liquid discharge pipe 19. In an embodiment of this utility model, when the main gas pipe 3 rotates, the scraper 20 at the bottom of the mounting bracket 10 on its outer wall rotates synchronously around the axis of the main gas pipe with the mounting bracket 10; the bottom of the scraper 20 is in close contact with the bottom of the tank 1, and slides along the bottom of the tank during the revolution to scrape off the phosphoric acid deposits or impurities generated at the bottom of the tank due to the reaction. The scraped deposits are collected with the waste liquid to the bottom of the tank 1, and can finally be discharged by opening the valve on the waste liquid discharge pipe 19. This invention solves the problem of sediment buildup at the bottom of the tank 1 and blockage of the waste liquid discharge pipe 19 in existing equipment. It eliminates the need for manual disassembly and cleaning, reducing maintenance costs and operational risks. At the same time, it avoids localized corrosion caused by sediment adhering to the bottom of the tank, extends the service life of the tank, ensures smooth waste liquid discharge, maintains continuous and stable operation of the equipment, and meets the needs of high efficiency and low maintenance in industrial production.

[0027] The workflow of this embodiment is as follows: 1. Check the sealing performance of tank 1 and the connection status of each component. Inject the preset amount of absorbent liquid through the spray liquid filling port at the top of tank 1 until the liquid level covers the auxiliary gas pipe 4 and the stirring assembly, and then close the filling port valve. 2. When the power supply of motor 5 is turned on, the output shaft of motor drives the first gear 6 to rotate. Through gear meshing, the second gear 7 and the main air pipe 3 are driven to rotate synchronously around their own axis. During the rotation of the main air pipe 3, the mounting bracket 10 and the rotating rod 14 on its outer wall also revolve together, triggering the vertical stirring component and the upper and lower stirring components to work together. The friction between the first rubber wheel 12 and the inner wall of the tank 1 drives the drive rod 11 and the first stirring blade 13 to rotate. The second rubber wheel 17 rolls along the annular track 16, driving the rotating rod 14 and the second stirring blade 15 to rotate, forming a three-dimensional stirring flow field.

[0028] 3. Open the valve on the inlet pipe 9. The mixed waste gas containing phosphine flows into the cyclone connector 8 through the inlet pipe 9. It is stably transported to the rotating main air pipe 3 through its dynamic sealing structure, and then distributed to each group of auxiliary air pipes 4. The waste gas is discharged from the exhaust hole of the auxiliary air pipe 4 in the form of dispersed bubbles and directly enters the stirring area between the two groups of first stirring blades 13. At the same time, the bubbles discharged from the upper and lower auxiliary air pipes 4 are cross-mixed under the action of the rotating rod 14 and the second stirring blade 15, and fully contact and react with the spray liquid. At the same time, when the main air pipe 3 revolves, the scraper 20 at the bottom of the mounting frame 10 slides along the bottom of the tank 1 and continuously scrapes off the phosphoric acid deposits generated by the reaction. The deposits flow with the spray liquid and collect in the conical waste liquid area at the bottom of the tank 1.

[0029] 4. After the equipment has been running for a preset time, the treated gas is discharged by opening the exhaust pipe 18, and then the valve on the waste liquid discharge pipe 19 discharges the phosphoric acid-containing waste liquid and the scraped sediment together to the subsequent purification equipment.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A phosphine gas recovery device, characterized in that, Includes a tank body (1), an air inlet pipe (9) is provided at the top of the tank body (1), a partition (2) is provided inside the tank body (1), a main air pipe (3) is rotatably installed on the partition (2), and a rotary exhaust assembly is connected to the main air pipe (3); The main air pipe (3) is symmetrically equipped with mounting brackets (10), and vertical stirring components are provided between the mounting brackets (10); The outer wall of the main air pipe (3) is rotatably mounted with a rotating rod (14), and the rotating rod (14) is provided with an upper and lower stirring assembly; The tank (1) is provided with an exhaust pipe (18) at the top and a waste liquid discharge pipe (19) at the bottom. The rotary exhaust assembly includes an auxiliary air pipe (4), a motor (5), a first gear (6), and a second gear (7). The outer wall of the main air pipe (3) is connected to multiple sets of auxiliary air pipes (4). The second gear (7) is sleeved on the main air pipe (3). The output end of the motor (5) is provided with a first gear (6). The first gear (6) meshes with the second gear (7).

2. The phosphine gas recovery device according to claim 1, characterized in that, The bottom of the air intake pipe (9) is provided with a cyclone connector (8), which is connected to the top of the main air pipe (3).

3. The phosphine gas recovery device according to claim 1, characterized in that, The vertical stirring assembly includes a drive rod (11), a first rubber wheel (12) and a first stirring blade (13). The drive rod (11) is rotatably mounted between two mounting brackets (10). The drive rod (11) is provided with multiple sets of first stirring blades (13). The top of the drive rod (11) is provided with a first rubber wheel (12). The first rubber wheel (12) rolls with the inner wall of the tank (1).

4. The phosphine gas recovery device according to claim 3, characterized in that, The end of the auxiliary air pipe (4) is located between the two sets of first stirring blades (13).

5. The phosphine gas recovery device according to claim 1, characterized in that, The upper and lower stirring assembly includes a second stirring blade (15), an annular track (16), and a second rubber wheel (17). The inner wall of the tank (1) is provided with an annular track (16), and the end of the rotating rod (14) is provided with a second rubber wheel (17). The second rubber wheel (17) rolls with the annular track (16), and the rotating rod (14) is provided with multiple sets of second stirring blades (15).

6. The phosphine gas recovery device according to claim 5, characterized in that, The rotating rod (14) is located between the upper and lower sets of auxiliary air pipes (4).

7. The phosphine gas recovery device according to claim 1, characterized in that, The mounting bracket (10) has a scraper (20) at the bottom, and the scraper (20) is in contact with the bottom of the tank (1).

8. The phosphine gas recovery device according to claim 1, characterized in that, The auxiliary air pipe (4) is provided with multiple exhaust holes.

9. The phosphine gas recovery device according to claim 1, characterized in that, The exhaust pipe (18) is installed through the partition (2).

10. The phosphine gas recovery device according to claim 1, characterized in that, A valve is provided on the waste liquid discharge pipe (19).

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