A phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function

Abstract

This invention discloses a phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function, including an absorption tower, a liquid distributor and an inlet pipe disposed on the absorption tower, an outlet pipe at the top of the absorption tower, and a drain pipe at the bottom of the absorption tower. It also includes an adaptive flow stabilizer and a gravity feedback anti-clogging packing assembly disposed within the absorption tower. The liquid distributor is located above the gravity feedback anti-clogging packing assembly, and the adaptive flow stabilizer is located below the gravity feedback anti-clogging packing assembly. This invention relates to the technical field of phosphorus trichloride production tail gas treatment equipment, specifically providing a phosphorus trichloride production tail gas absorption and treatment device with integrated adaptive flow stabilization, real-time monitoring of packing blockage, and gravity feedback anti-clogging, and equipped with safety monitoring function.

Description

Technical Field

[0001] This invention relates to the technical field of phosphorus trichloride production tail gas treatment equipment, specifically to a phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function. Background Technology

[0002] Phosphorus trichloride, as an important chemical intermediate, produces tail gas containing toxic and harmful components such as hydrogen chloride, phosphides, and chlorine during its production process. This tail gas is highly corrosive and irritating. If it is discharged directly without effective treatment, it will not only cause serious air pollution but also threaten the personal safety of operators at the production site. Therefore, it must be purified to meet standards through a dedicated absorption and treatment device before being discharged.

[0003] In existing technologies, although conventional phosphorus trichloride production tail gas absorption towers are equipped with liquid distributors and packing layers to achieve gas-liquid contact absorption, they still have many technical defects in actual operation: First, the tail gas inlet flow rate is prone to fluctuation with production conditions, and the absorption tower lacks an effective flow stabilization structure. Uneven airflow velocity leads to insufficient gas-liquid contact, significantly reducing tail gas absorption efficiency, and some toxic components are directly emitted without being absorbed. Second, solid impurities in the tail gas are prone to clogging the packing layer. Existing devices lack a structure for real-time monitoring of the packing blockage degree, and operators cannot promptly grasp the packing condition. Blockage can lead to a sudden increase in pressure inside the tower, which not only affects the absorption effect but also easily causes potential safety hazards in equipment operation. Third, the airflow distribution inside the tower is poor, with short contact time and small contact area with the absorbent liquid, further restricting the tail gas purification effect. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this invention provides a phosphorus trichloride production tail gas absorption and treatment device that integrates adaptive flow stabilization, real-time monitoring of packing blockage, and gravity feedback anti-blockage, and has safety monitoring functions.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function, including an absorption tower and a liquid distributor and an inlet pipe disposed on the absorption tower. The top of the absorption tower is provided with an outlet pipe and the bottom of the absorption tower is provided with a drain pipe. It also includes an adaptive flow stabilizer and a gravity feedback anti-clogging packing assembly disposed in the absorption tower. The liquid distributor is located above the gravity feedback anti-clogging packing assembly, and the adaptive flow stabilizer is located below the gravity feedback anti-clogging packing assembly.

[0006] Preferably, the adaptive flow stabilizer includes a flow stabilizer shroud, an annular piston, a first spring, an impeller, a connecting shaft, and a fan. A support is provided on the lower side of the inside of the absorption tower. The flow stabilizer shroud is mounted on the support, and a fixing frame is provided inside the flow stabilizer shroud. A connecting column is provided at the center of the fixing frame, connecting the fixing frame and the top of the flow stabilizer shroud. The fixing frame and connecting column divide the inside of the flow stabilizer shroud from top to bottom into an annular outlet chamber and a cylindrical inlet chamber. The flow stabilizer shroud also has an outlet hole communicating with the outlet chamber. The inlet pipe is mounted on the flow stabilizer shroud and communicates with the inlet chamber. The annular piston is slidably disposed within the outlet chamber. The two ends of the first spring are respectively connected to the top of the flow stabilizer shroud and the top surface of the annular piston. The cross-sectional area of ​​the gas flow through the outlet hole can be adjusted by the up-and-down sliding of the annular piston. The connecting shaft is rotatably mounted on the support and rotates upwards through the flow stabilizer shroud. The impeller is mounted on the connecting shaft and located within the inlet chamber. The airflow discharged through the inlet pipe can drive the impeller to rotate. The fan is mounted on the top of the connecting shaft.

[0007] Preferably, the gravity feedback anti-clogging packing assembly includes a packing cage, exhaust gas absorption and purification packing, guide rods, a second spring, a rack, a gear, a rotating shaft, and a pointer. The exhaust gas absorption and purification packing is placed inside the packing cage, the guide rods are mounted on the packing cage, and several groups of guide rods are arranged in a circular array. A support is provided inside the absorption tower, and the guide rods slide through the support. The two ends of the second spring are fixed to the support and the packing cage, respectively. An indicator plate is provided on the absorption tower, the rotating shaft is rotatably mounted on the indicator plate and extends rotatably into the absorption tower, the gear is sleeved on the rotating shaft, the rack is mounted on the packing cage and meshes with the gear, and the pointer is mounted on the rotating shaft to indicate the indicator plate.

[0008] More preferably, the indicator panel is provided with a transparent protective cover.

[0009] More preferably, the bracket is provided with a fixing groove, and the flow stabilizer is detachably installed in the fixing groove.

[0010] In a further preferred embodiment, the annular piston is provided with a guide groove, and the connecting column is provided with a guide block, the guide block being slidably disposed within the guide groove.

[0011] More preferably, the indicator panel is divided into a safe area, a buffer area, and a danger area. When the pointer points to the danger area, the external alarm device will sound an alarm to remind the staff that the packing is seriously clogged.

[0012] Preferably, the packing cage is equipped with a sealing door to facilitate the replacement of the exhaust gas absorption and purification packing.

[0013] More preferably, the gravity feedback anti-clogging filler assembly is provided in two sets from top to bottom.

[0014] More preferably, the air outlet is provided in several groups at equal intervals along the circumferential direction of the flow stabilizer.

[0015] The beneficial effects of the present invention using the above structure are as follows: Real-time adaptive adjustment of exhaust gas flow is achieved through the adaptive flow stabilizer. When the exhaust gas intake flow increases, the airflow pushes the annular piston to compress the first spring and move it upward, increasing the gas flow cross-sectional area of ​​the outlet. When the intake flow decreases, the first spring resets and drives the annular piston downward, reducing the flow cross-sectional area of ​​the outlet. This ensures that the exhaust gas always enters the packing assembly area at a stable flow rate, avoiding insufficient gas-liquid contact caused by airflow velocity fluctuations and improving exhaust gas absorption efficiency.

[0016] The airflow discharged from the inlet pipe drives the impeller in the inlet chamber to rotate. The impeller drives the fan at the top to rotate synchronously through the connecting shaft. The fan rotation creates a secondary disturbance to the upward-flowing exhaust gas, causing the exhaust gas to form turbulence in the tower. This greatly increases the contact area and contact time between the exhaust gas and the absorbent liquid, further improving the gas-liquid mass transfer efficiency and ensuring that toxic and harmful components are fully absorbed.

[0017] The gravity feedback anti-clogging packing assembly uses changes in the gravity of the packing cage to link the position of a pointer on an indicator panel, visually reflecting the degree of packing blockage. The indicator panel is divided into safe, buffer, and danger zones, allowing operators to quickly assess the operating conditions. When the pointer reaches the danger zone, an external alarm device automatically sounds, enabling real-time monitoring and tiered early warning of packing blockage. This avoids safety hazards such as sudden pressure increases within the tower caused by packing blockage, ensuring safe operation of the unit. Two sets of gravity feedback anti-clogging packing assemblies achieve two-stage absorption and purification of the exhaust gas. The exhaust gas passes sequentially through the lower and upper packing assemblies, fully contacting the absorbent sprayed by the liquid distributor. Through two adsorption and absorption reactions, toxic and harmful components such as hydrogen chloride, phosphides, and chlorine in the exhaust gas are effectively removed, ensuring that the treated exhaust gas meets emission standards.

[0018] The flow stabilizer hood is detachably mounted on the bracket via a fixing slot, facilitating the disassembly, inspection, and cleaning of the adaptive flow stabilizer. A sealed door on the packing cage allows for replacement of the exhaust gas absorption and purification packing without the need for complete disassembly of the packing assembly, reducing the difficulty of manual maintenance. The guide groove of the annular piston cooperates with the guide block of the connecting column to ensure the smooth sliding of the annular piston and prevent jamming that could affect the flow stabilization effect. The transparent protective cover of the indicator panel effectively prevents dust and corrosive gases from damaging the indicator structure, extending the service life of the monitoring components. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1This is a perspective view of an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of an embodiment of the present invention;

[0022] Figure 3 This is a front view of an embodiment of the present invention;

[0023] Figure 4 This is a left view of an embodiment of the present invention;

[0024] Figure 5 This is a top view of an embodiment of the present invention;

[0025] Figure 6 for Figure 3 A sectional view along section AA;

[0026] Figure 7 for Figure 2 Enlarged view of section A;

[0027] Figure 8 for Figure 6 Enlarged view of section B;

[0028] Figure 9 This is a schematic diagram of the flow stabilizer in an embodiment of the present invention.

[0029] Among them, 1. Absorption tower, 2. Liquid distributor, 3. Inlet pipe, 4. Drain pipe, 5. Outlet pipe, 6. Adaptive flow stabilizer, 7. Gravity feedback anti-clogging packing assembly, 11. Support, 12. Support, 13. Indicator, 14. Transparent protective cover, 61. Flow stabilizer, 62. Ring piston, 63. First spring, 64. Impeller, 65. Connecting shaft, 66. Fan, 71. Packing cage, 72. Tail gas absorption and purification packing, 73. Guide rod, 74. Second spring, 75. Rack, 76. Gear, 77. Rotating shaft, 78. Pointer, 111. Fixing groove, 611. Fixing frame, 612. Connecting column, 613. Inlet chamber, 614. Outlet chamber, 615. Outlet hole, 616. Guide block, 631. Guide groove. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.

[0032] like Figures 1-9 As shown, the present invention discloses a phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function, including an absorption tower 1, a liquid distributor 2 and an inlet pipe 3 disposed on the absorption tower 1, an outlet pipe 5 disposed at the top of the absorption tower 1, a drain pipe 4 disposed at the bottom of the absorption tower 1, and also includes an adaptive flow stabilizer 6 and a gravity feedback anti-clogging packing assembly 7 disposed in the absorption tower 1. The liquid distributor 2 is located above the gravity feedback anti-clogging packing assembly 7 and is used to spray alkaline absorption liquid onto the packing assembly. The adaptive flow stabilizer 6 is located below the gravity feedback anti-clogging packing assembly 7 to realize adaptive flow stabilization of the tail gas intake.

[0033] The adaptive flow stabilizer 6 includes a flow stabilizer 61, an annular piston 62, a first spring 63, an impeller 64, a connecting shaft 65, and a fan 66. A support 11 is located on the lower side inside the absorption tower 1, and a fixing groove 111 is provided on the support 11. The flow stabilizer 61 is detachably installed in the fixing groove 111 for easy disassembly and maintenance. A fixing frame 611 is located inside the flow stabilizer 61, and a connecting column 612 connecting the fixing frame 611 and the top of the flow stabilizer 61 is located at the center of the fixing frame 611. The fixing frame 611 and the connecting column 612 divide the flow stabilizer 61 from top to bottom into an annular outlet chamber 614 and a cylindrical inlet chamber 613. The flow stabilizer 61 also has an outlet hole 615 communicating with the outlet chamber 614. Several groups of outlet holes 615 are evenly spaced along the circumference of the flow stabilizer 61. The inlet pipe 3 is installed on the flow stabilizer 61 and communicates with the inlet chamber 613. The exhaust gas passes through the inlet chamber 613. After entering the air outlet chamber 614, it is evenly discharged through multiple sets of air outlet holes 615.

[0034] The annular piston 62 is slidably disposed in the air outlet chamber 614. The annular piston 62 is provided with a guide groove 631, and the connecting column 612 is provided with a guide block 616. The guide block 616 is slidably disposed in the guide groove 631. The two ends of the first spring 63 are respectively connected to the top of the flow stabilizer 61 and the top surface of the annular piston 62. The cross-sectional area of ​​the gas flow through the air outlet 615 can be adjusted by sliding the annular piston 62 up and down, so as to realize the adaptive flow stabilization of the airflow.

[0035] The connecting shaft 65 is rotatably mounted on the bracket 11 and rotates upward through the flow stabilizer 61. The impeller 64 is mounted on the connecting shaft 65 and located in the air inlet chamber 613. The airflow discharged through the air inlet pipe 3 can drive the impeller 64 to rotate. The fan 66 is mounted on the top of the connecting shaft 65. The fan 66 rotates in conjunction with the connecting shaft 65 to achieve secondary disturbance of the exhaust gas.

[0036] The gravity feedback anti-clogging packing assembly 7 has two sets arranged from top to bottom. The gravity feedback anti-clogging packing assembly 7 includes a packing cage 71, a tail gas absorption and purification packing 72, a guide rod 73, a second spring 74, a rack 75, a gear 76, a rotating shaft 77, and a pointer 78. The tail gas absorption and purification packing 72 is placed inside the packing cage 71. The packing cage 71 is equipped with a sealing door to facilitate the replacement of the tail gas absorption and purification packing 72. The guide rod 73 is located on the packing cage 71 and is arranged in a circular array of several sets. The absorption tower 1 is equipped with a support 12. The guide rod 73 slides through the support 12. The two ends of the second spring 74 are fixed to the support 12 and the packing cage 71, respectively.

[0037] The absorption tower 1 is equipped with an indicator panel 13, which is covered with a transparent protective cover 14. A rotating shaft 77 is rotatably mounted on the indicator panel 13 and extends into the absorption tower 1. A gear 76 is sleeved on the rotating shaft 77. A rack 75 is mounted on the packing cage 71 and meshes with the gear 76. A pointer 78 is mounted on the rotating shaft 77 to indicate the indicator panel 13. The indicator panel 13 is divided into a safe area, a buffer area, and a dangerous area. When the pointer 78 indicates the dangerous area, an external alarm device will sound an alarm to remind the staff that the packing is seriously blocked.

[0038] In practical use, the toxic exhaust gas generated during the phosphorus trichloride production process enters the intake chamber 613 of the adaptive flow stabilizer 6 through the intake pipe 3. The airflow impacts the impeller 64 in the intake chamber 613, causing the impeller 64 and the connecting shaft 65 to rotate, thereby causing the fan 66 at the top of the connecting shaft 65 to rotate synchronously. At the same time, the airflow enters the exhaust chamber 614 and is discharged into the absorption tower through the exhaust port 615.

[0039] When changes in production conditions lead to an increase in exhaust gas intake flow, the air pressure in the exhaust chamber 614 rises, pushing the annular piston 62 to compress the first spring 63 and slide upward along the guide block 616, increasing the gas flow cross-sectional area of ​​the exhaust port 615, allowing the exhaust gas to be discharged quickly and ensuring a stable flow rate. When the intake flow decreases, the air pressure in the exhaust chamber 614 decreases, the first spring 63 elastically resets, and drives the annular piston 62 to slide downward, reducing the flow cross-sectional area of ​​the exhaust port 615, preventing the exhaust gas flow rate from being too slow, and always achieving adaptive and stable flow regulation of the exhaust gas.

[0040] The exhaust gas discharged through the outlet 615 flows upward. When it passes through the fan 66, the rotating fan 66 creates a secondary disturbance to the exhaust gas, causing the exhaust gas to form turbulence in the absorption tower and be more evenly distributed in the tower. Then the exhaust gas first enters the lower gravity feedback anti-clogging packing assembly 7, and comes into full contact with the alkaline absorption liquid sprayed by the liquid distributor 2 on the surface of the exhaust gas absorption and purification packing 72. Most of the hydrogen chloride and chlorine in the exhaust gas are absorbed and reacted.

[0041] The unabsorbed exhaust gas continues to flow upward and enters the upper gravity feedback anti-clogging packing assembly 7 for secondary absorption and purification. Phosphates and residual acidic components in the exhaust gas are fully removed. The qualified exhaust gas after two-stage absorption is discharged through the gas outlet pipe 5 at the top of the absorption tower. The waste liquid after absorption reaction is collected at the bottom of the absorption tower and discharged for treatment through the drain pipe 4.

[0042] When exhaust gas passes through the packing cage 71, solid impurities in it adhere to the surface of the exhaust gas absorption and purification packing 72. As impurities accumulate, the overall weight of the packing cage 71 gradually increases. When the weight exceeds the elastic force of the second spring 74, the packing cage 71 slides downward along the guide rod 73, compressing the second spring 74. The vibration generated during the downward movement of the packing cage 71 shakes off some loose impurities attached to the surface of the packing inside, achieving gravity feedback-based self-anti-clogging and slowing down the packing blockage speed. After the impurities are shaken off, the weight of the packing cage 71 decreases, the second spring 74 elastically resets, and drives the packing cage 71 to move upward, returning to its initial position. This process is repeated to achieve continuous self-anti-clogging of the packing.

[0043] When the packing cage 71 moves up and down, its outer rack 75 moves synchronously. The rack 75 meshes with the gear 76, driving the gear 76 and the rotating shaft 77 to rotate, which in turn causes the pointer 78 at the end of the rotating shaft 77 to rotate on the indicator disk 13. When the packing is not blocked, the weight of the packing cage 71 is at its minimum, and the pointer 78 indicates the safe area. When a small amount of impurities adhere to the surface of the packing, causing slight blockage, the weight of the packing cage 71 increases and moves slightly downward, and the pointer 78 rotates to the buffer area, reminding the staff to pay attention to the working condition of the packing. When the packing is severely blocked, the weight of the packing cage 71 increases significantly and moves downward to the limit position, and the pointer 78 rotates to the danger area. At this time, the external alarm device automatically sounds an audible and visual alarm, reminding the staff to open the sealing door of the packing cage 71 in time to replace the exhaust gas absorption and purification packing 72.

[0044] When impurities accumulate inside the flow stabilizer or the impeller 64 or fan 66 becomes stuck, the flow stabilizer cover 61 can be directly removed from the fixing slot 111 of the bracket 11 for internal cleaning, component inspection and replacement. After the inspection and repair are completed, it can be re-clamped. The operation is convenient.

[0045] In summary, the adaptive flow stabilizer 6 enables real-time adaptive adjustment of the exhaust gas flow. When the exhaust gas intake flow increases, the airflow pushes the annular piston 62 to compress the first spring 63 and move it upward, increasing the gas flow cross-sectional area of ​​the outlet 615. When the intake flow decreases, the first spring 63 resets and drives the annular piston 62 to move downward, reducing the flow cross-sectional area of ​​the outlet 615. This ensures that the exhaust gas always enters the packing assembly area at a stable flow rate, avoiding insufficient gas-liquid contact caused by airflow velocity fluctuations and improving exhaust gas absorption efficiency.

[0046] The airflow discharged from the inlet pipe 3 drives the impeller 64 in the inlet chamber 613 to rotate. The impeller 64 drives the top fan 66 to rotate synchronously through the connecting shaft 65. The rotation of the fan 66 creates a secondary disturbance to the upward-flowing exhaust gas, causing the exhaust gas to form turbulence in the tower. This significantly increases the contact area and contact time between the exhaust gas and the absorbent liquid, further improving the gas-liquid mass transfer efficiency and ensuring that toxic and harmful components are fully absorbed.

[0047] The gravity feedback anti-clogging packing assembly 7 uses the change in gravity of the packing cage 71 to link the position of the pointer 78 on the indicator panel 13, intuitively reflecting the degree of packing blockage. The indicator panel 13 is divided into safe, buffer, and dangerous zones, allowing operators to quickly assess the operating conditions. When the pointer 78 reaches the dangerous zone, the external alarm device automatically sounds, achieving real-time monitoring and graded early warning of packing blockage. This avoids safety hazards such as sudden increases in tower pressure caused by packing blockage from the source, ensuring the safe operation of the equipment. Two sets of gravity feedback anti-clogging packing assemblies 7 are set up to achieve two-stage absorption and purification of the exhaust gas. The exhaust gas passes through the lower and upper packing assemblies in sequence, making full contact with the absorbent sprayed by the liquid distributor 2. After two adsorption and absorption reactions, toxic and harmful components such as hydrogen chloride, phosphides, and chlorine in the exhaust gas can be fully removed, ensuring that the treated exhaust gas meets emission standards.

[0048] The flow stabilizer 61 is detachably mounted on the bracket 11 via the fixing groove 111, facilitating the disassembly, maintenance, and cleaning of the adaptive flow stabilizer 6. The packing cage 71 is equipped with a sealing door, allowing the replacement of the exhaust gas absorption and purification packing 72 without disassembling the entire packing assembly, reducing the difficulty of manual maintenance. The guide groove 631 of the annular piston 62 cooperates with the guide block 616 of the connecting column 612 to ensure the smooth sliding of the annular piston 62 and avoid jamming that could affect the flow stabilization effect. The transparent protective cover 14 of the indicator panel 13 can effectively prevent dust and corrosive gases from damaging the indicator structure and extend the service life of the monitoring components.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function, comprising an absorption tower (1), a liquid distributor (2) and an inlet pipe (3) disposed on the absorption tower (1), wherein an outlet pipe (5) is provided at the top of the absorption tower (1) and a drain pipe (4) is provided at the bottom of the absorption tower (1), characterized in that: It also includes an adaptive flow stabilizer (6) and a gravity feedback anti-clogging packing assembly (7) installed in the absorption tower (1), wherein the liquid distributor (2) is located above the gravity feedback anti-clogging packing assembly (7) and the adaptive flow stabilizer (6) is located below the gravity feedback anti-clogging packing assembly (7); The adaptive flow stabilizer (6) includes a flow stabilizer shroud (61), an annular piston (62), a first spring (63), an impeller (64), a connecting shaft (65), and a fan (66). The absorption tower (1) has a support (11) on its lower side. The flow stabilizer shroud (61) is mounted on the support (11). The flow stabilizer shroud (61) has a fixing frame (611) inside. The fixing frame (611) has a connecting column (612) at its center that connects the fixing frame (611) and the top of the flow stabilizer shroud (61). The fixing frame (611) and the connecting column (612) divide the flow stabilizer shroud (61) into an annular air outlet chamber (614) and a cylindrical air inlet chamber (613) from top to bottom. The flow stabilizer shroud (61) also has an air outlet hole (615) that communicates with the air outlet chamber (614). The air inlet pipe (3) is set on the flow stabilizer shroud (61) and communicates with the air inlet chamber (613). The annular piston (62) is slidably disposed in the air outlet chamber (614). The two ends of the first spring (63) are respectively connected to the top of the flow stabilizer (61) and the top surface of the annular piston (62). The cross-sectional area of ​​the gas flow through the air outlet (615) can be adjusted by sliding the annular piston (62) up and down. The connecting shaft (65) is rotatably disposed on the bracket (11) and rotates upward through the flow stabilizer (61). The impeller (64) is installed on the connecting shaft (65) and located in the air inlet chamber (613). The airflow discharged through the air inlet pipe (3) can drive the impeller (64) to rotate. The fan (66) is installed on the top of the connecting shaft (65).

2. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 1, characterized in that: The gravity feedback anti-clogging packing assembly (7) includes a packing cage (71), exhaust gas absorption and purification packing (72), guide rods (73), a second spring (74), a rack (75), a gear (76), a rotating shaft (77), and a pointer (78). The exhaust gas absorption and purification packing (72) is placed inside the packing cage (71). The guide rods (73) are located on the packing cage (71) and are arranged in a circular array of several groups. The absorption tower (1) is provided with a support (12). The guide rods (73) slide. Through the support (12), the two ends of the second spring (74) are fixed to the support (12) and the packing cage (71) respectively. The absorption tower (1) is provided with an indicator plate (13). The rotating shaft (77) is rotatably mounted on the indicator plate (13) and extends into the absorption tower (1). The gear (76) is sleeved on the rotating shaft (77). The rack (75) is mounted on the packing cage (71) and meshes with the gear (76). The pointer (78) is mounted on the rotating shaft (77) to indicate the indicator plate (13).

3. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 2, characterized in that: The indicator panel (13) is provided with a transparent protective cover (14).

4. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 1, characterized in that: The bracket (11) is provided with a fixing groove (111), and the flow stabilizer (61) is detachably installed in the fixing groove (111).

5. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 1, characterized in that: The annular piston (62) is provided with a guide groove (631), and the connecting column (612) is provided with a guide block (616), which is slidably disposed in the guide groove (631).

6. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 2, characterized in that: The indicator panel (13) is divided into a safe area, a buffer area and a danger area. When the pointer (78) points to the danger area, the external alarm device will sound an alarm to remind the staff that the packing is seriously blocked.

7. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 2, characterized in that: The packing cage (71) is equipped with a sealing door, which facilitates the replacement of the exhaust gas absorption and purification packing (72).

8. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 1, characterized in that: The gravity feedback anti-clogging packing assembly (7) has two sets arranged from top to bottom.

9. The phosphorus trichloride production tail gas absorption and treatment device with safety monitoring function according to claim 1, characterized in that: The air outlet (615) is provided in several groups at equal intervals along the circumference of the flow stabilizer (61).

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