A titanium tetrachloride refined tail gas treatment system and method

Abstract

The present invention belongs to the technical field of titanium tetrachloride tail gas treatment, in particular, a titanium tetrachloride refined tail gas treatment system and method, including a leaching tower and a gas blocking device, the top of the leaching tower is provided with an air outlet pipe, the side of the bottom of the leaching tower is provided with an air inlet pipe and a drain pipe, a valve is installed on the drain pipe, a spray assembly is provided inside the leaching tower, and the gas blocking device is installed on the air outlet pipe, including a negative pressure blower, an air jet pipe and a guide plate, the air jet pipe is connected to the air outlet end of the negative pressure blower and passes through the air outlet pipe, the guide plate is tilted inside the air outlet pipe, and the air jet pipe is toward the center of the bottom surface of the guide plate. In the present invention, by arranging the gas blocking device, the reverse airflow generated by the negative pressure blower is used to disperse the rising tail gas to form a turbulent spray, which significantly increases the contact area and contact time between the tail gas and the spray liquid, effectively improves the reaction efficiency of the pollutants in the tail gas and the spray liquid, makes the tail gas treatment more sufficient, and greatly improves the tail gas purification effect.

Description

Technical Field

[0001] The present invention relates to the technical field of titanium tetrachloride tail gas treatment, in particular to a titanium tetrachloride refined tail gas treatment system and method. Background Art

[0002] In the production process of chemical products such as titanium dioxide and sponge titanium, the refining of titanium tetrachloride is a key link. However, this process will produce exhaust gas containing corrosive and toxic gases such as TiCl4, HCl, and Cl2. If it is directly discharged without effective treatment, it will not only seriously pollute the atmospheric environment and endanger human health, but also cause waste of resources.

[0003] At present, traditional titanium tetrachloride refined tail gas treatment technology mostly adopts a single spray absorption method, which has problems such as insufficient contact between tail gas and spray liquid, low reaction efficiency, and unstable treatment effect, making it difficult to meet increasingly stringent environmental emission standards. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a system and method for treating titanium tetrachloride refined tail gas.

[0005] The present invention proposes a titanium tetrachloride refined tail gas treatment system, comprising a leaching tower and a gas blocking device, wherein the top of the leaching tower is provided with an outlet pipe, the side of the bottom of the leaching tower is provided with an air inlet pipe and a drain pipe, a valve is installed on the drain pipe, a spray assembly is provided inside the leaching tower, and the gas blocking device is installed on the outlet pipe, comprising a negative pressure fan, an air jet pipe and a guide plate, the air jet pipe is connected to the air outlet end of the negative pressure fan and passes through the air outlet pipe, the guide plate is arranged obliquely inside the air outlet pipe, and the air jet pipe faces the center position of the bottom surface of the guide plate; the tail gas is introduced into the leaching tower through the air inlet pipe The exhaust gas is sprayed and treated by the spray assembly in the elution tower, and then the treated exhaust gas is discharged from the outlet pipe. During this period, the air blocking device is started according to the reaction of the exhaust gas and the spray liquid, and the negative pressure fan sprays gas to the guide plate through the jet pipe. The gas rebounds downward through the guide plate, and the reverse airflow generated by the negative pressure fan is used to disperse the rising exhaust gas, forming turbulence to promote spraying, thereby improving the reaction efficiency of the exhaust gas and the spray liquid, and the reverse airflow can also be used to form an upward barrier to the rising exhaust gas, thereby increasing the spraying time of the exhaust gas, thereby improving the exhaust gas treatment effect.

[0006] Preferably, the spray assembly includes a centrifugal pump fixedly connected to the outside of the elution tower, the water outlet of the centrifugal pump is connected to a main pipe, and multiple branches on the main pipe extend into the elution tower and are connected to a nozzle; the spray liquid is pumped into the main pipe by the centrifugal pump, and then the spray liquid enters the nozzle from the branch pipe for spraying. The structure of the nozzle also includes but is not limited to commonly used spray structures such as an annular spray pipe and a spiral spray pipe.

[0007] Preferably, both ends of the main shaft on the guide plate respectively pass through the air outlet pipe and are fixedly connected to the first shell, and a pair of symmetrically distributed fixing frames are fixed on the circumferential outer wall of the air outlet pipe, and the fixing frames are fixedly connected to the second shell rotatably connected to the first shell, and the first shell and the second shell are also connected internally by a coil spring; due to the action of the coil spring, the guide plate maintains an inclined posture under normal conditions, and then the gas ejected from the jet pipe acts on the guide plate, causing the guide plate to rotate at a certain angle and tend to stabilize, and then under the action of the turbulence formed subsequently, the guide plate swings due to unstable force, thereby increasing the diffusion angle and coverage range of the gas in the opposite direction, thereby expanding the turbulence.

[0008] Preferably, it also includes: a gas concentration acquisition module, installed in the outlet pipe, for monitoring the target pollutant concentration in real time, and generating a treatment degree coefficient through the control module; a pressure difference acquisition module, installed between the outlet pipe and the inlet pipe, for monitoring the inlet and outlet pressure difference of the elution tower in real time, and generating a pressure difference fluctuation coefficient through the control module; during which the control module conducts a comprehensive analysis of the generated treatment degree coefficient and pressure difference fluctuation coefficient, generates an evaluation coefficient, determines whether the scraping mechanism needs to intervene in the spraying state, compares the evaluation coefficient with a pre-set reference threshold, and controls the working state of the rotating mechanism and the scraping mechanism according to the comparison result.

[0009] Preferably, the output end and input end of the gas concentration acquisition module and the output end and input end of the pressure difference acquisition module are electrically connected to the input end and output end of the control module respectively, and the output end of the control module is electrically connected to the input end of the negative pressure fan and the input end of the centrifugal pump respectively.

[0010] Preferably, the control module controls the working states of the air blocking device and the spray assembly according to the comparison results in the following steps:

[0011] Real-time detection: The gas concentration acquisition module collects the target pollutant concentration; the pressure difference acquisition module collects the pressure difference between the inlet and outlet of the elution tower;

[0012] Coefficient calculation: The control module calculates the processing coefficient, pressure difference fluctuation coefficient and evaluation coefficient ;

[0013] Dynamic adjustment: If :Maintain current parameters; if :Start the negative pressure fan to generate reverse turbulence and simultaneously increase the spray liquid flow rate% is the reference threshold.

[0014] Preferably, the generation logic of the processing degree coefficient is:

[0015] S1. The gas concentration acquisition module is used to obtain the actual concentration of the target pollutant at different times during the spraying process of the exhaust gas within T time. The actual concentration obtained at the nth time within T time is calibrated as , , is a positive integer;

[0016] S2. Calculate the processing coefficient. The calculation expression is:

[0017]

[0018] Where, is the baseline value of the initial pollutant concentration in the intake air; is the number of sampling times within time T.

[0019] Preferably, the logic for generating the pressure difference fluctuation coefficient is:

[0020] S1. The pressure difference acquisition module is used to obtain the actual pressure difference between the inlet and outlet of the elution tower at different times during the spraying process. The actual pressure difference obtained at the jth time within the time T is calibrated as , , is a positive integer;

[0021] S2. Calculate the pressure difference fluctuation coefficient. The calculation expression is:

[0022]

[0023] Where, is the average pressure difference within time T; j is the number of sampling times within time T.

[0024] Preferably, the control module performs a formula analysis according to the formula:

[0025]

[0026] Where, 、 is the preset weight coefficient, .

[0027] The present invention also provides a method for treating titanium tetrachloride refined tail gas, comprising the following steps:

[0028] (a) The tail gas is passed into a pre-hydrolysis reactor using a two-stage atomization spray: the first stage sprays 8-12% dilute hydrochloric acid solution, and the second stage sprays a suspension containing 0.1-1 μm TiO2 seed crystals. The gas-liquid contact time is controlled to 5-8 seconds to cause the TiCl4 to be hydrolyzed in a directional manner to produce crystalline TiOCl2;

[0029] (b) After pre-hydrolysis, the gas enters the turbulent flow scrubber, where the lower layer sprays alkaline absorption liquid in a forward direction and the upper layer sprays circulating water in a reverse direction. Simultaneously, the evaluation coefficient Rsys is calculated based on the real-time monitored pressure difference and HCl concentration. When Rsys ≥ 2.0, the top negative pressure fan is started to generate reverse turbulence.

[0030] (c) The gas after turbulent treatment enters the gradient absorption unit and passes through:

[0031] First-stage absorption: Use 10~15% TiOCl2 solution to absorb TiCl4 and SiCl4, and control the solution Ti 4 ⁺Concentration>50g / L;

[0032] Secondary absorption: using 5~8% circulating dilute hydrochloric acid to absorb HCl and free Cl2;

[0033] Three-stage absorption: using Na2CO3 solution with pH=9 to absorb residual acid gas;

[0034] (d) Resource recovery:

[0035] The primary absorption liquid is atomized and pyrolyzed in a reactor (400-500°C) to generate H2TiO3, which is then calcined (900°C) to obtain rutile TiO2.

[0036] The secondary absorption liquid is concentrated through a diffusion dialysis membrane group to obtain 30% industrial hydrochloric acid.

[0037] Compared with the prior art, the present invention provides a titanium tetrachloride refined tail gas treatment system and method, which has the following beneficial effects:

[0038] 1. A titanium tetrachloride refined tail gas treatment system. The present invention sets a gas blocking device and uses the reverse airflow generated by the negative pressure fan to disperse the rising tail gas to form a turbulent spray, which significantly increases the contact area and contact time between the tail gas and the spray liquid, effectively improves the reaction efficiency between the pollutants in the tail gas and the spray liquid, makes the tail gas treatment more sufficient, and greatly improves the tail gas purification effect.

[0039] 2. A titanium tetrachloride refined tail gas treatment system. The design of the centrifugal pump, main pipe, branch pipe and nozzle of the spray assembly, as well as the coordination of components such as the guide plate and coil spring, not only makes the spraying process more uniform and efficient, but also expands the turbulent range through the swing of the guide plate, further enhancing the treatment effect.

[0040] 3. A titanium tetrachloride refined tail gas treatment system equipped with a gas concentration acquisition module and a pressure differential acquisition module, combined with a control module, enables real-time monitoring and intelligent analysis of the tail gas treatment process. By calculating the treatment coefficient, pressure differential fluctuation coefficient, and evaluation coefficient, it can accurately determine the tail gas treatment status and dynamically adjust the operating parameters of the gas blocking device and spray assembly based on actual conditions, ensuring the system is always in optimal operating condition, while ensuring treatment effectiveness and reducing energy consumption and operating costs.

[0041] 4. A method for treating titanium tetrachloride refined tail gas adopts a multi-stage treatment process. While achieving efficient purification of tail gas, it recycles the primary absorption liquid and the secondary absorption liquid. Rutile TiO2 is generated through processes such as atomization pyrolysis and calcination, and industrial hydrochloric acid is obtained by concentration through a diffusion dialysis membrane group. This realizes the recycling of resources and improves the economic and environmental benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the overall structure of a titanium tetrachloride refined tail gas treatment system proposed by the present invention;

[0043] Figure 2 This is a schematic diagram of the internal structure of a titanium tetrachloride refined tail gas treatment system proposed by the present invention;

[0044] Figure 3 This is a schematic diagram of the installation structure between the guide plate and the fixing frame of a titanium tetrachloride refined tail gas treatment system proposed by the present invention;

[0045] Figure 4 For the present invention Figure 1 A schematic diagram of the enlarged structure at point A;

[0046] Figure 5 This is a system architecture diagram of a titanium tetrachloride refined tail gas treatment system proposed in the present invention;

[0047] Figure 6 The present invention provides a flow chart of a method for treating titanium tetrachloride refined tail gas.

[0048] In the figure: 1. elution tower; 2. outlet pipe; 3. inlet pipe; 4. negative pressure fan; 5. jet pipe; 6. guide plate; 7. centrifugal pump; 8. main pipe; 9. branch pipe; 10. nozzle; 11. drain pipe; 12. valve; 13. fixing bracket; 14. main shaft; 15. first shell; 16. second shell; 17. coil spring; 18. gas concentration acquisition module; 19. pressure difference acquisition module; 20. control module. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0051] Reference Figure 1-Figure 5 A titanium tetrachloride refined tail gas treatment system includes a leaching tower 1 and a gas blocking device. The top of the leaching tower 1 is provided with an outlet pipe 2, and the side of the bottom of the leaching tower 1 is provided with an air inlet pipe 3 and a drain pipe 11. A valve 12 is installed on the drain pipe 11. A spray assembly is provided inside the leaching tower 1. The gas blocking device is installed on the outlet pipe 2, including a negative pressure fan 4, an air jet pipe 5 and a guide plate 6. The air jet pipe 5 is connected to the air outlet end of the negative pressure fan 4 and passes through the outlet pipe 2. The guide plate 6 is arranged obliquely inside the outlet pipe 2, and the air jet pipe 5 is oriented toward the center of the bottom surface of the guide plate 6.

[0052] During use, the exhaust gas is introduced into the elution tower 1 through the air inlet pipe 3, and the exhaust gas is sprayed and treated by the spray component in the elution tower 1, and then the treated exhaust gas is discharged from the exhaust pipe 2. During this period, the air blocking device is started according to the reaction of the exhaust gas and the spray liquid, and the negative pressure fan 4 sprays gas to the guide plate 6 through the jet pipe 5. The gas rebounds downward through the guide plate 6, so that the reverse airflow generated by the negative pressure fan 4 is used to disperse the rising exhaust gas, forming turbulence to promote spraying, thereby improving the reaction efficiency of the exhaust gas and the spray liquid, and the reverse airflow can also be used to form an upward barrier to the rising exhaust gas, thereby increasing the spraying time of the exhaust gas, thereby improving the exhaust gas treatment effect.

[0053] The spray assembly includes a centrifugal pump 7 fixedly connected to the outside of the elution tower 1, the outlet of the centrifugal pump 7 is connected to a main pipe 8, and multiple branch pipes 9 on the main pipe 8 extend into the elution tower 1 and are connected to a spray head 10;

[0054] During use, the spray liquid is pumped into the main pipe 8 through the centrifugal pump 7, and then the spray liquid enters the nozzle 10 from the branch pipe 9 for spraying. The structure of the nozzle 10 also includes but is not limited to common spray structures such as an annular spray pipe and a spiral spray pipe.

[0055] Furthermore, both ends of the main shaft 14 on the guide plate 6 pass through the outlet pipe 2 and are fixedly connected to a first housing 15. A pair of symmetrically distributed fixing brackets 13 are fixed to the circumferential outer wall of the outlet pipe 2. A second housing 16 is fixedly connected to the fixing brackets 13 and is rotatably connected to the first housing 15. The first and second housings 15, 16 are further connected internally by a coil spring 17.

[0056] During use, due to the action of the coil spring 17, the guide plate 6 maintains an inclined posture under normal conditions, and then the gas ejected from the air injection pipe 5 acts on the guide plate 6, causing the guide plate 6 to rotate at a certain angle and tend to stabilize. Then, under the action of the subsequent turbulence, the guide plate 6 swings due to unstable force, thereby increasing the diffusion angle and coverage range of the gas in the opposite direction, thereby expanding the turbulence.

[0057] In another embodiment, a titanium tetrachloride refined tail gas treatment system further includes:

[0058] The gas concentration acquisition module 18 is installed in the gas outlet pipe 2 and is used to monitor the concentration of target pollutants (such as free chlorine and TiCl4 residue) in real time and generate a treatment degree coefficient through the control module 20;

[0059] The pressure difference acquisition module 19 is installed between the outlet pipe 2 and the inlet pipe 3, and is used to monitor the inlet and outlet pressure difference of the elution tower 1 in real time, and generate the pressure difference fluctuation coefficient through the control module 20;

[0060] It should be noted that the gas concentration acquisition module 18 can be an infrared gas analyzer or other equipment capable of monitoring the concentration of target pollutants in real time, the pressure difference acquisition module 19 can be a differential pressure transmitter or other equipment capable of monitoring the pressure difference between the inlet and outlet of the elution tower 1 in real time, and the control module 20 is an embedded controller (such as the STM32 series) with an integrated data fusion algorithm. Therefore, the gas concentration acquisition module 18, the pressure difference acquisition module 19 and the control module 20 are not specifically limited here and can be selected according to actual needs;

[0061] During use, the control module 20 conducts a comprehensive analysis of the generated processing degree coefficient and pressure difference fluctuation coefficient to generate an evaluation coefficient, determines whether the scraping mechanism needs to intervene in the spraying state, compares the evaluation coefficient with the pre-set reference threshold, and controls the working state of the rotating mechanism and the scraping mechanism according to the comparison result.

[0062] Among them, the output end and input end of the gas concentration acquisition module 18 and the output end and input end of the pressure difference acquisition module 19 are electrically connected to the input end and output end of the control module 20 respectively, and the output end of the control module 20 is electrically connected to the input end of the negative pressure fan 4 and the input end of the centrifugal pump 7 respectively.

[0063] In another embodiment, the control module 20 comprehensively analyzes the generated processing degree coefficient and pressure difference fluctuation coefficient to generate an evaluation coefficient, determines whether the scraping mechanism needs to intervene in the spraying state, compares the evaluation coefficient with a preset reference threshold, and controls the working state of the rotating mechanism and the scraping mechanism based on the comparison result. The specific execution steps are as follows:

[0064] Real-time detection: The gas concentration acquisition module 18 acquires the target pollutant concentration; the pressure difference acquisition module 19 acquires the pressure difference between the inlet and outlet of the elution tower 1;

[0065] Coefficient calculation:

[0066] Processing coefficient : The treatment degree coefficient characterizes the dynamic attenuation degree of pollutant removal efficiency. It quantifies the removal ability of the leaching system for target pollutants (such as free chlorine, TiCl4, etc.) in real time through the rate of change of pollutant concentration before and after tail gas treatment. Dγ≈1 indicates that the removal efficiency is stagnant, the eluent is saturated / the nozzle is blocked, and the pollutant concentration does not decrease; Dγ>1 and continuously increasing indicates that the removal efficiency is improved, fresh eluent is injected, and the concentration gradient increases; Dγ<1 and continuously decreasing indicates that the removal efficiency is attenuated, the gas-liquid contact time is insufficient, or the reaction activity decreases;

[0067] The generation logic of the processing degree coefficient is:

[0068] S1. The gas concentration acquisition module 18 is used to obtain the actual concentration of the target pollutant at different times during the spraying process of the tail gas within T time, and the actual concentration obtained at the nth time within T time is calibrated as , , is a positive integer;

[0069] S2. Calculate the processing coefficient. The calculation expression is:

[0070]

[0071] Where, is the baseline value of the initial pollutant concentration in the intake air; is the number of sampling times within time T.

[0072] Pressure difference fluctuation coefficient The differential pressure fluctuation coefficient characterizes the intensity of abnormal fluctuations that could indicate blockage risk. It quantifies the nonlinear change in flow resistance caused by the adhesion of viscous materials in the exhaust gas (such as TiO2 colloids produced by hydrolysis) to the packing or pipe walls. Pσ≈1 indicates a smooth flow path and a stable differential pressure within the laminar flow range; Pσ>1 indicates the initial stage of accumulation of adherent materials and high-frequency, small oscillations in the differential pressure (colloid adhesion); Pσ≫1 indicates a serious blockage risk and a continuous, step-like increase in the differential pressure (a decrease in the channel cross-sectional area).

[0073] The logic for generating the pressure difference fluctuation coefficient is:

[0074] S1, the pressure difference acquisition module 19 is used to obtain the actual pressure difference between the inlet and outlet of the elution tower 1 at different times during the spraying process T, and the actual pressure difference obtained at the jth time within T is calibrated as , , is a positive integer;

[0075] S2. Calculate the pressure difference fluctuation coefficient. The calculation expression is:

[0076]

[0077] Where, is the average pressure difference within time T; j is the number of sampling times within time T.

[0078] Evaluation coefficient : The evaluation coefficient characterizes the priority judgment of the comprehensive failure risk of the system. By coupling the processing efficiency (Dγ) and the fluid state (Pσ), a dynamic trade-off is established between the reduction of the cleaning capacity and the risk of mechanical blockage. The control module 20 is used for formula analysis. According to the formula:

[0079]

[0080] Where, 、 is the preset weight coefficient, .

[0081] Dynamic adjustment: If :Maintain current parameters; if : Start the negative pressure fan 4 to form turbulence and simultaneously increase the spray liquid flow by 20%. is the reference threshold.

[0082] Reference Figure 6 The present invention also provides a method for treating titanium tetrachloride refined tail gas, comprising the following steps:

[0083] (a) The tail gas is passed into a pre-hydrolysis reactor using a two-stage atomization spray: the first stage sprays 8-12% dilute hydrochloric acid solution (flow rate 200 L / min, pressure 0.3 MPa), and the second stage sprays a suspension containing 0.1-1 μm TiO2 seeds (TiO2 concentration 10 g / L, particle size 0.5 μm). The gas-liquid contact time is controlled to 5-8 seconds to cause the TiCl4 to be hydrolyzed in a directional manner to produce crystalline TiOCl2;

[0084] Effect: TiCl4 hydrolysis rate is 98%, and colloid generation is reduced by 70%;

[0085] (b) After prehydrolysis, the gas enters the turbulent flow scrubber, where alkaline absorption liquid is sprayed in a forward direction on the lower layer and circulating water is sprayed in a reverse direction on the upper layer. Simultaneously, an evaluation coefficient Rsys = ln(1.5 × ΔP + CHCl / 100) is calculated based on the real-time monitored pressure difference (ΔP) and HCl concentration (CHCl). When Rsys ≥ 2.0, the top negative pressure fan is activated to generate reverse turbulence.

[0086] It should be noted that a differential pressure sensor (range 0-50kPa) is installed in the tower's straight pipe section (>5 pipe diameters from the elbow); an infrared spectrometer monitors the outlet HCl concentration in real time (accuracy ±1ppm); and the control logic: when ΔP>8kPa and CHCl>100ppm, Rsys≥2.0 is triggered, and the fan backwash is started.

[0087] (c) The gas after turbulent treatment enters the gradient absorption unit and passes through:

[0088] First-stage absorption: Use 10~15% TiOCl2 solution to absorb TiCl4 and SiCl4, and control the solution Ti 4 ⁺Concentration>50g / L;

[0089] Secondary absorption: using 5~8% circulating dilute hydrochloric acid to absorb HCl and free Cl2;

[0090] Three-stage absorption: using Na2CO3 solution with pH=9 to absorb residual acid gas;

[0091] (d) Resource recovery:

[0092] The primary absorption liquid is atomized and pyrolyzed in a reactor (400-500°C) to generate H2TiO3, which is then calcined (900°C) to obtain rutile TiO2.

[0093] The secondary absorption liquid is concentrated through a diffusion dialysis membrane group to obtain 30% industrial hydrochloric acid.

[0094] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A titanium tetrachloride refined tail gas treatment system, comprising a leaching tower (1) and a gas blocking device, characterized in that: The top of the elution tower (1) is provided with an air outlet pipe (2), the side of the bottom of the elution tower (1) is provided with an air inlet pipe (3) and a drain pipe (11), a valve (12) is installed on the drain pipe (11), a spray assembly is provided inside the elution tower (1), and an air blocking device is installed on the air outlet pipe (2), comprising a negative pressure fan (4), an air jet pipe (5) and a guide plate (6), the air jet pipe (5) is connected to the air outlet end of the negative pressure fan (4) and passes through the air outlet pipe (2), the guide plate (6) is tilted and arranged inside the air outlet pipe (2), and the air jet pipe (5) faces the center position of the bottom surface of the guide plate (6); Both ends of the main shaft (14) on the guide plate (6) respectively penetrate the air outlet pipe (2) and are fixedly connected to the first shell (15); a pair of symmetrically distributed fixing frames (13) are fixed on the circumferential outer wall of the air outlet pipe (2); a second shell (16) rotatably connected to the first shell (15) is fixedly connected to the fixing frame (13); and the first shell (15) and the second shell (16) are further connected internally by a coil spring (17).

2. A titanium tetrachloride refined tail gas treatment system according to claim 1, characterized in that: The spray assembly comprises a centrifugal pump (7) fixedly connected to the outside of the elution tower (1); the water outlet of the centrifugal pump (7) is connected to a main pipe (8); a plurality of branch pipes (9) on the main pipe (8) extend into the elution tower (1) and are connected to a spray head (10).

3. A titanium tetrachloride refined tail gas treatment system according to claim 2, characterized in that: Also includes: A gas concentration acquisition module (18) is installed in the gas outlet pipe (2) and is used to monitor the concentration of target pollutants in real time and generate a treatment degree coefficient through a control module (20); A pressure differential acquisition module (19) is installed between the outlet pipe (2) and the inlet pipe (3) and is used to monitor the inlet and outlet pressure differential of the elution tower (1) in real time and generate a pressure differential fluctuation coefficient through a control module (20); The control module (20) performs a comprehensive analysis on the generated treatment degree coefficient and the pressure difference fluctuation coefficient to generate an evaluation coefficient, which is compared with a preset reference threshold value, and the working state of the air blocking device and the spray assembly is controlled according to the comparison result.

4. A titanium tetrachloride refined tail gas treatment system according to claim 3, characterized in that: The output end and input end of the gas concentration acquisition module (18) and the output end and input end of the pressure difference acquisition module (19) are electrically connected to the input end and output end of the control module (20), respectively. The output end of the control module (20) is electrically connected to the input end of the negative pressure fan (4) and the input end of the centrifugal pump (7).

5. A titanium tetrachloride refined tail gas treatment system according to claim 3, characterized in that: The control module (20) controls the working states of the air blocking device and the spray assembly according to the comparison results in the following steps: The gas concentration acquisition module (18) acquires the target pollutant concentration; the pressure difference acquisition module (19) acquires the pressure difference between the inlet and outlet of the elution tower (1); the control module (20) calculates the treatment degree coefficient, the pressure difference fluctuation coefficient and the evaluation coefficient and with the reference threshold Compare; if :Maintain current parameters; if : Start the negative pressure fan (4) to generate reverse turbulence and simultaneously increase the flow rate of the spray liquid.

6. A titanium tetrachloride refined tail gas treatment system according to claim 3, characterized in that: The generation logic of the processing degree coefficient is: S1. Obtain the actual concentration of target pollutants in the tail gas at different times during the spraying process T through the gas concentration acquisition module (18), and calibrate the actual concentration obtained at the nth time during the T time as , , is a positive integer; S2. Calculate the processing coefficient. The calculation expression is: Where, is the baseline value of the initial pollutant concentration in the intake air; is the number of sampling times within time T.

7. A titanium tetrachloride refined tail gas treatment system according to claim 6, characterized in that: The generation logic of the pressure difference fluctuation coefficient is: S1. Obtain the actual pressure difference between the inlet and outlet of the elution tower (1) at different times during the spraying treatment of the tail gas through the pressure difference acquisition module (19), and calibrate the actual pressure difference obtained at the jth time during the T time as , , is a positive integer; S2. Calculate the pressure difference fluctuation coefficient. The calculation expression is: Where, is the average pressure difference within time T; j is the number of sampling times within time T.

8. A titanium tetrachloride refined tail gas treatment system according to claim 7, characterized in that: The control module (20) performs a formula analysis according to the formula: Where, 、 is the preset weight coefficient, .

9. A method for treating titanium tetrachloride refined tail gas, used in the titanium tetrachloride refined tail gas treatment system according to claims 1-8, characterized in that: The following steps are involved: (a) The tail gas is passed into a pre-hydrolysis reactor using a two-stage atomization spray: the first stage sprays 8-12% dilute hydrochloric acid solution, and the second stage sprays a suspension containing 0.1-1 μm TiO2 seed crystals. The gas-liquid contact time is controlled to 5-8 seconds to cause the TiCl4 to be hydrolyzed in a directional manner to produce crystalline TiOCl2; (b) After pre-hydrolysis, the gas enters the turbulent flow scrubber, where the lower layer sprays alkaline absorption liquid in a forward direction and the upper layer sprays circulating water in a reverse direction. Simultaneously, the evaluation coefficient Rsys is calculated based on the real-time monitored pressure difference and HCl concentration. When Rsys ≥ 2.0, the top negative pressure fan is started to generate reverse turbulence. (c) The gas after turbulent treatment enters the gradient absorption unit and passes through: First-stage absorption: Use 10~15% TiOCl2 solution to absorb TiCl4 and SiCl4, and control the solution Ti 4 ⁺Concentration>50g / L; Secondary absorption: using 5~8% circulating dilute hydrochloric acid to absorb HCl and free Cl2; Tertiary absorption: using Na2CO3 solution with pH=9 to absorb residual acid gas; (d) Resource recovery: The primary absorption liquid is atomized and pyrolyzed in a reactor (400-500°C) to generate H2TiO3, which is then calcined (900°C) to obtain rutile TiO2. The secondary absorption liquid is concentrated through a diffusion dialysis membrane group to obtain 30% industrial hydrochloric acid.

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