A method for treating decompression tail gas

Abstract

The present invention relates to the technical field of sponge titanium, and discloses a method for treating depressurized tail gas, comprising preparing sponge titanium using a reactor, controlling pressure relief with a pressure relief valve, absorbing chlorine and hydrogen chloride using a separation tank, drying the chlorine and hydrogen chloride, storing the chlorine and hydrogen chloride in a collection tank, condensing the chlorine and hydrogen chloride in a condenser, filtering the chlorine and hydrogen chloride in a filter, and finally reaching a collection tank. In order to remove scale attached to the condenser, a nozzle is repeatedly deflected up and down so that a descaling agent can be evenly sprayed on the condenser, and a driven gear rotates and moves in the direction of a rack, and a rotating shaft rotates and also moves in the direction of the rack, and a brush can clean the scale softened by the descaling agent. The present invention sprays the descaling agent by a nozzle that repeatedly deflects up and down, and then uses the bristles on the rotating shaft to clean the scale on the condenser, thereby ensuring the condensation effect of the condenser.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium sponge, and in particular relates to a method for treating decompressed tail gas. Background Art

[0002] The production of titanium sponge by the magnesium thermal method is a continuous process, which specifically includes reduction, distillation, and cooling. The reduction process needs to last for nearly 100 hours. The reduction of titanium tetrachloride by magnesium is an exothermic reaction. A large amount of heat will be released during the reduction process, and the pressure in the reactor will continue to increase. Therefore, the reactor needs to be depressurized during the reaction to ensure the normal progress of the reaction. During the depressurization process, a large amount of depressurized tail gas will be discharged. Most of the substances in the tail gas in the early stage of depressurization are argon, and most of them are vaporized titanium tetrachloride and a small amount of incompletely reacted low-valent titanium in the later stage. After depressurization, on the one hand, a large amount of white smoke is generated to pollute the production environment, and on the other hand, the argon or titanium tetrachloride discharged during depressurization causes a waste of resources.

[0003] Patent CN218475150U discloses a device for recovering by-products from the preparation of titanium tetrachloride, comprising a slurry tank, a slurry inlet pipe, a slurry discharge pipe, a first valve, a second valve, a condensing kettle, two exhaust pipes, and a pipeline fan. A turning mechanism is provided in the slurry tank, which can omit the normal discharge time of the recovered slurry, so that discharge and filling can be carried out simultaneously, shortening the time for recovering titanium tetrachloride in the mud and facilitating the continuous recovery of the mud; Patent CN214105882U discloses a high-efficiency titanium tetrachloride gas cooling device, comprising a first-stage direct condenser connected in sequence, and a three-stage indirect condenser consisting of a first, second, and third indirect condenser, the cooling circulation medium inlet of the second indirect condenser being connected to the gas outlet of the third indirect condenser; the cooling circulation medium inlet of the third indirect condenser being connected to a refrigerant delivery pipeline, thereby improving cooling efficiency, avoiding excessive titanium tetrachloride spraying by direct cooling, and achieving high impurity removal efficiency.

[0004] The above patents all require the exhaust gas to be condensed. During the condensation process, unstable salts such as calcium bicarbonate contained in the cooling water will be converted into dense hard scale such as calcium carbonate when they come into contact with the condenser tube with higher temperature. The soft mud impurities in the cooling water will also adhere to the condenser tube. If they cannot be cleaned in time, it will affect the cooling effect of the condenser tube and thus affect the condensation of the exhaust gas.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The object of the present invention is to provide a method for treating decompressed tail gas to solve the above-mentioned problems in the prior art.

[0007] To achieve the above object, the present invention provides a method for treating decompressed tail gas, comprising the following steps:

[0008] S1. Check whether there is leakage between the pipelines, and add magnesium and titanium tetrachloride into the reactor to carry out reduction reaction;

[0009] S2. After the pressure of the reactor reaches 20kPa, the pressure relief valve is opened to control automatic pressure relief, and the tail gas is discharged into the gas collection hood;

[0010] S3. After 1-15 pressure reliefs, the first one-way valve on the first T-shaped pipe is opened, and the second one-way valve is closed. The tail gas enters the separation tank, where the chlorine and hydrogen chloride gases are absorbed by the alkali solution. The tail gas is then dried in the dryer and stored in the collection tank.

[0011] S4. After 16-17 pressure reliefs, the first one-way valve is closed and the second one-way valve is opened. The tail gas enters the condenser and is absorbed by the circulating water, and then condensed into liquid.

[0012] S5, then start the control motor to drive the eccentric wheel to rotate and push the control plate to move, thereby driving the connecting rod to deflect, causing the various mounting seats below it to deflect up and down repeatedly, and at the same time, the spray head deflects up and down repeatedly with the mounting seats, spraying the descaling agent evenly on the condenser tube;

[0013] S6. Restart the driving motor to drive the two driving gears to drive the two driven gears to rotate and mesh with the racks, and then the movable plate drives the rotating shaft to move along the long side of the racks, prompting the bristles to brush off the scale on the condenser tube;

[0014] S7. The condensed liquid continues to move into the filter, and after being filtered by the filter, it reaches the collection tank. The titanium tetrachloride in the collection tank returns to the titanium tetrachloride refining system for refining and reuse.

[0015] In the technical solution of the present invention, the reactor is pressurized to generate tail gas, and a pressure relief valve and an air collecting hood are installed on one side of the reactor. A first one-way valve and a second one-way valve are connected on one side of the air collecting hood. The outer end of the first one-way valve is sequentially connected with a separation tank, a dryer and a collection tank; wherein the outer end of the second one-way valve is sequentially connected with a condenser, a filter and a collection tank, a cover is fixed on the top surface of the condenser, and a descaling mechanism is provided in the condenser, the descaling mechanism includes the movable plate slidably connected to the bottom surface of the cover, a cleaning assembly for brushing scale is installed on the bottom surface of the movable plate, and a spray assembly for spraying descaling agent is also installed on the bottom surface of the movable plate, the condenser is installed in the condenser, a water inlet pipe is installed at the bottom end of one side wall of the condenser, and a water outlet pipe is installed at the top end of the other side wall of the condenser.

[0016] In the technical solution of the present invention, the cleaning assembly includes the rotating shaft rotatably connected to the left and right ends of the bottom surface of the movable plate, the two rotating shafts are respectively located on the left and right sides of the condenser tube, a plurality of bristles are regularly installed on the outer wall of the rotating shaft, and a driven gear is fixedly sleeved near the top of the outer wall of the rotating shaft.

[0017] In the technical solution of the present invention, the movable plate is rotatably connected to two driving gears between the two driven gears, the two driving gears are meshed with each other, the driven gear and the driving gear on the same side are meshed with each other, and the top surface of the movable plate is fixed with the drive motor with an output shaft coaxially connected to one of the driving gears.

[0018] In the technical solution of the present invention, the bottom surface of the cover is fixed with the racks at the left and right sides of the descaling mechanism through vertical plates, and the racks are meshed with the driven gear on the same side.

[0019] In the technical solution of the present invention, T-shaped plates are fixed at both ends of the top surface of the movable plate, and T-shaped grooves corresponding to the top positions of the T-shaped plates on the same side and with matching sizes are opened on both sides of the bottom surface of the cover.

[0020] In the technical solution of the present invention, the spray assembly includes four vertical tubes fixed respectively at the corners of the bottom surface of the movable plate, and a plurality of mounting seats are regularly hinged on the outer wall of the vertical tube close to the condenser tube. A nozzle is installed on the side of the mounting seat close to the condenser tube, and the mounting seat is connected to the adjacent vertical tube through a hose.

[0021] In the technical solution of the present invention, the spray assembly also includes four control motors respectively fixed on the bottom surface of the movable plate near each of the vertical pipes, the output shaft of the control motor is coaxially connected with an eccentric wheel, the bottom surface of the movable plate near each of the eccentric wheels is slidably connected with a control plate, an arc groove is provided at one end of the control plate near the adjacent eccentric wheel, the eccentric wheel fits tightly with the arc groove of the adjacent control plate, the bottom surface of each mounting seat near the adjacent nozzle and the bottom surface of the control plate are hinged with the connecting rod, and the lower end of the connecting rod is hinged to the top surface of the adjacent mounting seat below near the adjacent nozzle.

[0022] In the technical solution of the present invention, two groups of vertical plates are fixed in pairs on the bottom surface of the movable plate at the front and rear sides of each control plate, a fixed column is fixed between the bottom ends of the two vertical plates in each group, and a slider slidably connected to the adjacent fixed column is fixed to the middle part of the front and rear sides of the control plate, and a spring is installed between the slider and the vertical plate away from the eccentric wheel and is sleeved on the outside of the fixed column.

[0023] In the technical solution of the present invention, two adjacent vertical pipes are connected via the same second T-shaped pipe, and the liquid inlet end of the second T-shaped pipe is connected to the external supply device.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. In the present invention, the depressurized tail gas is collected, which is beneficial to improving the environment of the production site, avoiding the harm of the tail gas to the health of the on-site operators and the damage to the atmospheric environment, and avoiding the harm of the tail gas to the health of the on-site operators and the damage to the atmospheric environment. According to the progress of the reduction reaction, the depressurized tail gas is collected and processed in sections, which can reduce the loss of argon and recover titanium tetrachloride to reduce the waste of titanium resources.

[0026] 2. In the present invention, the descaling agent is sprayed by the nozzle that can be swung up and down repeatedly, so that the descaling agent can be sprayed on the condenser tube comprehensively and evenly, so that the hard scale can be softened. Then, the driven gear is indirectly driven to rotate by the driving motor, so that the movable plate moves along the direction of the rack, and the rotating shaft rotates while moving along the direction of the rack, so as to clean the scale on the lower condenser tube, improve the cleaning effect, and prevent the scale from affecting the condensation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the overall flow chart of the present invention;

[0028] Figure 2 is a cross-sectional view of the condenser of the present invention;

[0029] Figure 3 A bottom view of the cover of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the descaling mechanism of the present invention;

[0031] Figure 5 An exploded view of the cleaning assembly of the present invention;

[0032] Figure 6 Schematic diagram of the structure of the spray assembly in the present invention;

[0033] Figure 7 Schematic diagram of the partial structure of the spray assembly in the present invention;

[0034] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0035] Description of reference numerals:

[0036] 1. Reactor; 10. Pressure relief valve;

[0037] 2. Gas collecting hood;

[0038] 3. First T-shaped pipe; 30. First one-way valve; 31. Second one-way valve;

[0039] 4. Separation tank;

[0040] 5. Dryer;

[0041] 6. Collection tank;

[0042] 7. Condenser; 70. Cover; 700. T-slot; 701. Rack; 71. Descaling mechanism; 710. Movable plate; 711. T-plate; 712. Cleaning assembly; 7120. Rotating shaft; 7121. Brush; 7122. Driven gear; 7123. Driving gear; 7124. Drive motor; 713. Spray assembly; 7130. Vertical pipe; 71300. Second T-tube; 7131. Mounting base; 7132. Spray head; 7133. Connecting rod; 7134. Control motor; 7135. Eccentric wheel; 7136. Control panel; 71360. Slider; 7137. Vertical plate; 7138. Fixed column; 7139. Spring; 72. Condenser; 73. Water inlet pipe; 74. Water outlet pipe.

[0043] 8. Filter;

[0044] 9. Collection tank. DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0046] Unless expressly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising” will be understood to include the stated elements or components but not to exclude other elements or components.

[0047] Reference Figures 1-8 A method for treating depressurized tail gas according to the present invention comprises the following steps:

[0048] S1. Check whether there is leakage between the pipelines, and add magnesium and titanium tetrachloride into the reactor 1 for reduction reaction;

[0049] S2. After the pressure of the reactor 1 reaches 20 kPa, the pressure relief valve 10 is opened to control automatic pressure relief, and the tail gas is discharged into the gas collecting hood 2;

[0050] S3, after 1-15 times of pressure relief, the first one-way valve 30 on the first T-shaped pipe 3 is opened, and the second one-way valve 31 is closed. The tail gas enters the separation tank 4, where the chlorine and hydrogen chloride gases are absorbed by the alkali solution. The tail gas is then dried by the dryer 5 and stored in the collection tank 6;

[0051] S4. After 16-17 pressure reliefs, the first one-way valve 30 is closed and the second one-way valve 31 is opened. The tail gas enters the condenser 7 and is absorbed by the circulating water to be condensed into liquid.

[0052] S5. Then, the control motor 7134 is started to drive the eccentric wheel 7135 to rotate, thereby pushing the control plate 7136 to move, thereby driving the connecting rod 7133 to deflect, causing the mounting seats 7131 below it to deflect up and down repeatedly. At the same time, the spray head 7132 deflects up and down repeatedly with the mounting seats 7131, spraying the descaling agent evenly on the condenser tube 72;

[0053] S6. Restart the driving motor 7124 to drive the two driving gears 7123 to rotate the two driven gears 7122, which mesh with the rack 701. Then, the movable plate 710 drives the rotating shaft 7120 to move along the long side of the rack 701, prompting the bristles 7121 to brush away the scale on the condenser tube 72.

[0054] S7. The condensed liquid continues to move into the filter 8, and after being filtered by the filter 8, it reaches the collection tank 9. The titanium tetrachloride in the collection tank 9 is returned to the titanium tetrachloride refining system for refining and reuse.

[0055] In the present invention, a reactor 1 is used to pressurize and generate tail gas. A pressure relief valve 10 and a gas collecting hood 2 are installed on one side of the reactor 1. A first one-way valve 30 and a second one-way valve 31 are connected on one side of the gas collecting hood 2. The outer end of the first one-way valve 30 is sequentially connected to a separation tank 4, a dryer 5 and a collection tank 6; the outer end of the second one-way valve 31 is sequentially connected to a condenser 7, a filter 8 and a collection tank 9.

[0056] In the present invention, in order to remove the scale attached to the condenser pipe 72, Figure 2-Figure 8 A cover 70 is fixed to the top surface of the condenser 7, and a descaling mechanism 71 is provided in the condenser 7. The descaling mechanism 71 includes a movable plate 710 slidably connected to the bottom surface of the cover 70. A cleaning component 712 for cleaning scale is installed on the bottom surface of the movable plate 710. A spray component 713 for spraying descaling agent is also installed on the bottom surface of the movable plate 710. A condenser pipe 72 is installed in the condenser 7, and a water inlet pipe 73 is installed at the bottom end of one side wall of the condenser 7. A water outlet pipe 74 is installed at the top end of the other side wall of the condenser 7. Cooling water is introduced into the water inlet pipe 73 and then discharged from the water outlet pipe 74, so that the exhaust gas in the condenser pipe 72 is quickly cooled and condensed into liquid.

[0057] Specifically, the cleaning component 712 includes a rotating shaft 7120 rotatably connected to the left and right ends of the bottom surface of the movable plate 710. The two rotating shafts 7120 are respectively located on the left and right sides of the condenser 72. A number of bristles 7121 are regularly installed on the outer wall of the rotating shaft 7120. A driven gear 7122 is fixedly sleeved near the top of the outer wall of the rotating shaft 7120. When the rotating shaft 7120 rotates, the bristles 7121 will continuously clean the scale on the lower condenser 72.

[0058] Furthermore, the movable plate 710 is rotatably connected to two driving gears 7123 between the two driven gears 7122. The two driving gears 7123 are meshed with each other, and the driven gear 7122 and the driving gear 7123 on the same side are meshed with each other. A driving motor 7124 with an output shaft coaxially connected to one of the driving gears 7123 is fixed on the top surface of the movable plate 710. The two driven gears 7122 are driven by the two driving gears 7123 to rotate, and the rotation directions of the two driven gears 7122 are opposite.

[0059] In addition, racks 701 are fixed to the bottom surface of the cover 70 on the left and right sides of the descaling mechanism 71 through vertical plates. The racks 701 are engaged with the driven gear 7122 on the same side. The driven gear 7122 will move along the direction of the rack 701 during rotation, causing the rotating shaft 7120 to move along the direction of the rack 701 during rotation, thereby improving the cleaning effect.

[0060] It is worth noting that T-shaped plates 711 are fixed at both ends of the top surface of the movable plate 710, and T-shaped grooves 700 corresponding to the top position of the T-shaped plates 711 on the same side and with the same size are opened on both sides of the bottom surface of the cover 70. The T-shaped plates 711 pull the movable plate 710 and allow the movable plate 710 to move normally.

[0061] In the above scheme, the spray assembly 713 includes four vertical tubes 7130 respectively fixed at the corners of the bottom surface of the movable plate 710. A plurality of mounting seats 7131 are regularly hinged on the side of the outer wall of the vertical tube 7130 close to the condenser 72. A nozzle 7132 is installed on the side of the mounting seat 7131 close to the condenser 72. The mounting seat 7131 is connected to the adjacent vertical tube 7130 through a hose, and the descaling agent is sprayed on the left and right sides of the condenser 72 to facilitate the subsequent brushing of scale by the bristles 7121.

[0062] Specifically, the spray assembly 713 also includes four control motors 7134 fixed to the bottom surface of the movable plate 710 near each vertical pipe 7130, the output shaft of the control motor 7134 is coaxially connected to the eccentric wheel 7135, and the bottom surface of the movable plate 710 near each eccentric wheel 7135 is slidably connected with a control plate 7136, and an arc groove is provided at one end of the control plate 7136 near the adjacent eccentric wheel 7135, and the eccentric wheel 7135 fits tightly with the arc groove of the adjacent control plate 7136. The bottom surface of each mounting seat 7131 near the adjacent nozzle 7132 and the bottom surface of the control plate 7136 are hinged with a connecting rod 7133, and the lower end of the connecting rod 7133 is hinged to the top surface of the adjacent mounting seat 7131 below near the adjacent nozzle 7132, so that the nozzle 7132 can be repeatedly deflected upward, so that the nozzle 7132 sprays comprehensively and evenly, reducing blind spots in spraying.

[0063] Furthermore, two groups of vertical plates 7137 are fixed in pairs on the bottom surface of the movable plate 710 at the front and rear sides of each control plate 7136, and a fixed column 7138 is fixed between the bottom ends of each group of two vertical plates 7137. Sliders 71360 slidingly connected to adjacent fixed columns 7138 are fixed in the middle of the front and rear sides of the control plate 7136. A spring 7139 is installed between the slider 71360 and the vertical plate 7137 away from the eccentric wheel 7135 and is sleeved on the outside of the fixed column 7138. The spring 7139 ensures that the arc groove of the control plate 7136 is always tightly fitted with the eccentric wheel 7135, ensuring that the nozzle 7132 can be deflected up and down repeatedly.

[0064] It is worth noting that the two adjacent vertical pipes 7130 are connected by the same second T-shaped tube 71300. The liquid inlet end of the second T-shaped tube 71300 is connected to the external supply device. The second T-shaped tube 71300 is a hose and needs to be redundant to meet the movement requirements of the movable plate 710.

[0065] The working principle of removing scale on the condenser pipe 72 in the method for treating depressurized tail gas of the present invention is as follows:

[0066] The output shaft of the control motor 7134 drives the eccentric wheel 7135 to rotate. During the rotation, the eccentric wheel 7135 pushes the control plate 7136 to move. At the same time, the slider 71360 compresses the spring 7139, so that the arc groove of the control plate 7136 is always in close contact with the eccentric wheel 7135. The control plate 7136 moves repeatedly and drives the connecting rod 7133 to deflect repeatedly. The highest mounting seat 7131 deflects up and down repeatedly accordingly. Then, other mounting seats 7131 are driven to deflect up and down repeatedly through other connecting rods 7133. The descaling agent is provided by the external supply device, so that the spray head 7132 can spray the descaling agent comprehensively and evenly, reducing blind spots in the spraying.

[0067] The output shaft of the control motor 7134 drives the driving gear 7123 coaxially connected thereto to rotate, and the other driving gear 7123 rotates accordingly. The two driving gears 7123 then respectively drive the two driven gears 7122 to rotate. The driven gears 7122 will move along the direction of the rack 701 during the rotation process, so that the rotating shaft 7120 can also move along the direction of the rack 701 when rotating, so that the cleaning effect of the bristles 7121 is better.

[0068] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for treating decompressed tail gas, characterized in that: The steps include: S1. Check whether there is leakage between the pipelines, add magnesium and titanium tetrachloride into the reactor (1) to carry out reduction reaction; S2. After the pressure of the reactor (1) reaches 20 kPa, the pressure relief valve (10) is opened to control automatic pressure relief, and the tail gas is discharged into the gas collecting hood (2); S3, after 1-15 times of pressure relief, the first one-way valve (30) on the first T-shaped pipe (3) is opened, and the second one-way valve (31) is closed. The tail gas enters the separation tank (4) and is absorbed by the alkali solution to remove the chlorine and hydrogen chloride gases. The tail gas is then dried by the dryer (5) and stored in the collection tank (6); S4, after 16-17 pressure reliefs, the first one-way valve (30) is closed, the second one-way valve (31) is opened, and the tail gas enters the condenser (7) where the heat is absorbed by the circulating water and condensed into liquid; S5. Then, the control motor (7134) is started to drive the eccentric wheel (7135) to rotate, thereby pushing the control plate (7136) to move, thereby driving the connecting rod (7133) to deflect, causing the various mounting seats (7131) below it to deflect up and down repeatedly. At the same time, the spray head (7132) deflects up and down repeatedly along with the mounting seat (7131), and sprays the descaling agent evenly on the condenser tube (72); S6. Restarting the driving motor (7124) drives the two driving gears (7123) to rotate the two driven gears (7122), and meshing with the rack (701). Then, the movable plate (710) drives the rotating shaft (7120) to move along the long side of the rack (701), prompting the bristles (7121) to brush off the scale on the condenser tube (72); S7. The condensed liquid continues to move into the filter (8), and after being filtered by the filter (8), reaches the collection tank (9). The titanium tetrachloride in the collection tank (9) returns to the titanium tetrachloride refining system for refining and reuse.

2. The method for treating depressurized tail gas according to claim 1, wherein: The reactor (1) is pressurized to generate tail gas. A pressure relief valve (10) and a gas collecting hood (2) are installed on one side of the reactor (1). A first one-way valve (30) and a second one-way valve (31) are connected to one side of the gas collecting hood (2). The outer end of the first one-way valve (30) is sequentially connected to a separation tank (4), a dryer (5) and a collection tank (6). The outer end of the second one-way valve (31) is sequentially connected with a condenser (7), a filter (8) and a collecting tank (9); a cover (70) is fixed on the top surface of the condenser (7); a descaling mechanism (71) is provided in the condenser (7); the descaling mechanism (71) comprises a movable plate (710) slidably connected to the bottom surface of the cover (70); a cleaning assembly (712) for cleaning scale is installed on the bottom surface of the movable plate (710); a spray assembly (713) for spraying a descaling agent is also installed on the bottom surface of the movable plate (710); the condenser (72) is installed in the condenser (7); a water inlet pipe (73) is installed at the bottom end of one side wall of the condenser (7); and a water outlet pipe (74) is installed at the top end of the other side wall of the condenser (7).

3. The method for treating depressurized tail gas according to claim 2, wherein: The cleaning assembly (712) includes a rotating shaft (7120) rotatably connected to the left and right ends of the bottom surface of the movable plate (710), and the two rotating shafts (7120) are respectively located on the left and right sides of the condenser tube (72). A plurality of bristles (7121) are regularly installed on the outer wall of the rotating shaft (7120), and a driven gear (7122) is fixedly sleeved on the outer wall of the rotating shaft (7120) near the top.

4. The method for treating depressurized tail gas according to claim 1, wherein: The movable plate (710) is rotatably connected to two driving gears (7123) between the two driven gears (7122), the two driving gears (7123) are meshed with each other, the driven gear (7122) and the driving gear (7123) on the same side are meshed with each other, and the driving motor (7124) whose output shaft is coaxially connected to one of the driving gears (7123) is fixed on the top surface of the movable plate (710).

5. The method for treating depressurized tail gas according to claim 2, wherein: The bottom surface of the cover (70) is fixed with the rack (701) at both the left and right sides of the descaling mechanism (71) through vertical plates, and the rack (701) is meshed with the driven gear (7122) on the same side.

6. The method for treating depressurized tail gas according to claim 2, wherein: T-shaped plates (711) are fixed at both left and right ends of the top surface of the movable plate (710), and T-shaped grooves (700) corresponding to the top positions of the T-shaped plates (711) on the same side and having the same size as the left and right sides of the bottom surface of the cover (70) are opened.

7. The method for treating depressurized tail gas according to claim 2, wherein: The spray assembly (713) includes four vertical tubes (7130) respectively fixed at the corners of the bottom surface of the movable plate (710), and a plurality of mounting seats (7131) are regularly hinged on the side of the outer wall of the vertical tube (7130) close to the condenser tube (72), and a nozzle (7132) is installed on the side of the mounting seat (7131) close to the condenser tube (72), and the mounting seat (7131) and the adjacent vertical tube (7130) are connected through a hose.

8. The method for treating depressurized tail gas according to claim 7, wherein: The spray assembly (713) further comprises four control motors (7134) respectively fixed to the bottom surface of the movable plate (710) near each of the vertical pipes (7130), the output shaft of the control motor (7134) being coaxially connected to an eccentric wheel (7135), and a control plate (7136) being slidably connected to each of the eccentric wheels (7135) on the bottom surface of the movable plate (710), and the control plate (7136) being close to the adjacent eccentric wheels (7135). 135) is provided with an arc groove at one end, the eccentric wheel (7135) is tightly fitted with the arc groove of the adjacent control plate (7136), and the bottom surface of each mounting seat (7131) near the adjacent nozzle (7132) and the bottom surface of the control plate (7136) are hinged with the connecting rod (7133), and the lower end of the connecting rod (7133) is hinged to the top surface of the adjacent mounting seat (7131) below near the adjacent nozzle (7132).

9. The method for treating depressurized tail gas according to claim 2, wherein: Two groups of vertical plates (7137) are fixed on the bottom surface of the movable plate (710) at the front and rear sides of each control plate (7136), and a fixed column (7138) is fixed between the bottom ends of the two vertical plates (7137) in each group. Sliders (71360) that are slidably connected to adjacent fixed columns (7138) are fixed in the middle of the front and rear sides of the control plate (7136). A spring (7139) that is sleeved outside the fixed column (7138) is installed between the slider (71360) and the vertical plate (7137) away from the eccentric wheel (7135).

10. The method for treating depressurized tail gas according to claim 7, wherein: The two adjacent vertical pipes (7130) are connected to the same second T-shaped pipe (71300), and the liquid inlet end of the second T-shaped pipe (71300) is connected to an external supply device.

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