A liquid chlorine gasification safety maintenance and treatment system and treatment method

Abstract

The present invention discloses a liquid chlorine gasification safety maintenance and treatment system and a treatment method, which include a storage bin, an absorption pump, a chlorine gas absorption tower, and a hydrochloric acid absorption tower. The absorption pump transports the leaked chlorine gas to the chlorine gas absorption tower, and the chlorine gas absorption tower is connected to the hydrochloric acid absorption tower. The hydrochloric acid absorption tower includes a gas-liquid distribution chamber, an absorption and cooling chamber, graphite absorption strips, and two switching plates. The gas-liquid distribution chamber and the absorption and cooling chamber are separated by one switching plate. A plurality of graphite absorption strips are arranged between the two switching plates. The graphite absorption strips have a large-diameter curved surface, a small-diameter curved surface, a large-diameter docking surface, and a small-diameter docking surface. The large-diameter curved surfaces and the small-diameter curved surfaces of each graphite absorption strip can respectively form cylindrical barrels with different diameters. The switching plate includes a general lining plate, a switching baffle, and a belt moving component. The general lining plate is provided with a plurality of through holes in an array, the switching baffle is provided with a plurality of docking ports, and four through grooves are arranged on the periphery of the through holes. The belt moving component is installed in the through grooves.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid chlorine safety treatment systems, and particularly to a liquid chlorine gasification safety maintenance treatment system and a treatment method. Background Art

[0002] In the industrial production process of cresol, chlorine gas is required. After the liquid chlorine is transported to the factory area by a transport tanker, it will be temporarily stored in a liquid chlorine storage tank, and then gasified by a liquid chlorine vaporizer for use in toluene chlorination. Since chlorine gas has strong toxicity, the storage and gasification processes of chlorine gas especially need to be safely maintained to prevent liquid chlorine leakage and absorb and treat chlorine gas in the first moment of liquid chlorine leakage.

[0003] Existing liquid chlorine safety treatment systems usually absorb the leaked chlorine gas with lye; there are also some liquid chlorine safety treatment systems that connect the lye absorption tower with the hydrochloric acid tail gas absorption tower of the toluene chlorination device, so as to use the sodium chloride generated by the lye absorption tower absorbing chlorine gas to absorb the hydrochloric acid tail gas generated by toluene chlorination.

[0004] Most of the hydrochloric acid tail gas of the existing toluene chlorination device is absorbed by a graphite absorber. A fixed-flow sodium chloride absorption liquid is injected into the graphite absorber to form a liquid film to absorb the hydrochloric acid tail gas. If the sodium chloride absorption liquid generated by treating the leaked chlorine gas is also injected into the graphite absorber, it will cause a sudden increase in the flow rate of the absorption liquid in the graphite absorber, making the liquid film of each tube in the graphite absorber thicker, and even directly blocking the tubes, resulting in a decrease in the gas flow rate in the tubes, and thus a decrease in the absorption efficiency of the hydrochloric acid tail gas.

[0005] At the same time, most of the tubular graphite absorbers in the existing graphite absorption tower are of integral design, and the entire graphite absorber needs to be removed and replaced during maintenance and replacement, resulting in a high maintenance cost. Summary of the Invention

[0006] In order to solve the problems mentioned in the above background art, the present invention provides a liquid chlorine gasification safety maintenance treatment system and a treatment method.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A safety maintenance and treatment system for liquid chlorine gasification, comprising a storage chamber, an absorption pump, a chlorine gas absorption tower and a hydrochloric acid absorption tower. The absorption pump is installed in the storage chamber to transport the leaked chlorine gas to the chlorine gas absorption tower for treatment. The chlorine gas absorption tower is connected to the hydrochloric acid absorption tower. The hydrochloric acid absorption tower includes a gas-liquid distribution chamber, an absorption and cooling chamber, graphite absorption strips and two switching plates. The gas-liquid distribution chamber and the absorption and cooling chamber are separated by one switching plate. A plurality of graphite absorption strips are arranged between the two switching plates. The graphite absorption strips have a large-diameter curved surface, a small-diameter curved surface, a large-diameter docking surface and a small-diameter docking surface. The graphite absorption strips are arranged in a cross-symmetric array. The large-diameter curved surfaces and the small-diameter curved surfaces of each graphite absorption strip can respectively form cylindrical tubes with different diameters around them;

[0009] The switching plate includes a general lining plate, a switching baffle and a belt moving component. The general lining plate is provided with a plurality of through holes in an array. The switching baffle is provided with a plurality of docking ports. Four through grooves are arranged around the through holes. The belt moving component is installed in the through grooves.

[0010] Preferably, the graphite absorption strips are arranged in an array. Every four graphite absorption strips are cross-symmetric with each other. The large-diameter curved surface and the small-diameter curved surface are respectively one-fourth of the circumferences of two cylindrical surfaces with different diameters. The large-diameter curved surface and the small-diameter curved surface are arranged oppositely and each bends in two opposite directions.

[0011] Preferably, the through holes are opened at the cross-symmetric centers of every four graphite absorption strips according to the arrangement positions of the graphite absorption strips.

[0012] Preferably, a plurality of switching baffles are arranged on the side of the general lining plate away from the graphite absorption strips. The switching baffles are arranged parallel to each other. The switching baffles are driven by a telescopic driving component to move.

[0013] Preferably, the distance between two adjacent docking ports is twice the distance between two adjacent through holes.

[0014] Preferably, the four through grooves are cross-symmetrically arranged around the through holes. The belt moving component includes an absorption strip connecting piece and a baffle connecting piece. The absorption strip connecting piece is connected to the graphite absorption strip, and the baffle connecting piece is connected to the switching baffle.

[0015] Preferably, different devices such as a straight rod connecting piece and a rotating connecting piece are respectively used to connect the absorption strip connecting piece and the baffle connecting piece in two opposite through grooves. The two ends of the straight rod connecting piece are respectively connected to the absorption strip connecting piece and the baffle connecting piece. The center position of the rotating connecting piece has a rotation axis with a fixed position. The rotating connecting piece can rotate axially around this axis. A sliding connecting piece is installed at each end of the rotating connecting piece. The sliding connecting piece can rotate axially around the end of the rotating connecting piece and is vertically slidably connected to the absorption strip connecting piece and the baffle connecting piece respectively.

[0016] Preferably, the chlorine absorption tower includes an absorption tower main body, a spray pipe, a tray, an alkali solution feeder, and a separation discharging assembly. A plurality of trays are horizontally installed inside the absorption tower main body, and a spray pipe is arranged between every two trays. The spray pipe is connected to the alkali solution feeder;

[0017] The separation discharging assembly is installed at the lower end of the absorption tower main body. The separation discharging assembly includes a partition plate, a central enclosing plate, an adjustment motor, and a separation cover plate. The partition plates are symmetrically installed outside the central enclosing plate and are integrally connected to the inner wall of the absorption tower main body. The adjustment motor is installed inside the space enclosed by the central enclosing plate, and the separation cover plate is installed above the adjustment motor;

[0018] The separation cover plate includes a covering sheet and a diversion plate. The covering sheet covers the upper opening of the central enclosing plate, and the diversion plate is connected to the covering sheet. The diversion plate can completely cover half of the annular space formed by the central enclosing plate and the inner wall of the absorption tower main body.

[0019] Preferably, the central enclosing plate is arranged at the central position of the lower end of the absorption tower main body, and the adjustment motor can drive the separation cover plate to rotate circumferentially.

[0020] Preferably, the upper surface of the diversion plate is inclined from the side close to the inner wall of the absorption tower main body to the side close to the covering sheet from top to bottom.

[0021] Preferably, a pair of pH monitors are also installed on the bottom plate of the absorption tower main body, and the pH monitors are respectively located on both sides of the partition plate in a cross shape.

[0022] Preferably, a first transfer pump and a second transfer pump are installed below the bottom plate of the absorption tower main body. The first transfer pump and the second transfer pump are respectively communicated with the absorption tower main body and the alkali solution feeder.

[0023] A method for safety maintenance and treatment of liquid chlorine gasification includes the following steps:

[0024] S1: When a leakage accident occurs to the liquid chlorine storage tank in the storage chamber, the chlorine gas automatic detection alarm in the storage chamber immediately interlocks to close each entrance and exit of the storage chamber, and interlocks to start the induced draft fan and the absorption pump to suck the leaked chlorine gas into the chlorine absorption tower for treatment;

[0025] S2: The reaction liquid after being treated by the chlorine absorption tower is injected into the hydrochloric acid absorption tower, and the tail gas containing a large amount of hydrochloric acid gas from the chlorinated toluene device is sent to the hydrochloric acid absorption tower for absorption;

[0026] S3: Separate the discharged material after being absorbed by the hydrochloric acid absorption tower, and separately collect the generated hydrochloric acid and sodium hypochlorite.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The graphite absorption strip can be butted with the switching plate according to the flow rate of the injected absorption liquid to form cylindrical tubes with different diameters, so that absorption liquids with different flow rates can smoothly form liquid films on the inner walls of the cylindrical tubes surrounded by the graphite absorption strip, and the hydrochloric acid gas can be smoothly absorbed.

[0029] 2. The butted and surrounded graphite absorption strip replaces the existing integral graphite absorber. When damaged, only the independent graphite absorption strip needs to be replaced, which greatly reduces the maintenance cost of the hydrochloric acid absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of a liquid chlorine gasification safety maintenance and treatment system according to the present invention;

[0032] Figure 2 It is a schematic cross-sectional structure diagram of a chlorine absorption tower according to the present invention;

[0033] Figure 3 It is a schematic structural diagram of an isolation discharging assembly according to the present invention;

[0034] Figure 4 It is a schematic cross-sectional structure diagram of a hydrochloric acid absorption tower according to the present invention;

[0035] Figure 5 It is a schematic structural diagram of a graphite absorption strip array and a switching plate from a bottom view angle according to the present invention;

[0036] Figure 6 It is a schematic structural diagram of a graphite absorption strip array and a switching plate from a top view angle according to the present invention;

[0037] Figure 7 It is a partial side cross-sectional view of the switching plate according to the present invention.

[0038] In the figure: 1. Storage chamber; 2. Absorption pump; 3. Chlorine absorption tower; 301. Liquid outlet; 31. Absorption tower main body; 32. Spray pipe; 33. Tray; 34. Alkali solution feeder; 35. Isolation discharging assembly; 351. Partition board; 352. Central enclosing board; 353. Adjustment motor; 354. Isolation cover plate; 3541. Cover sheet; 3542. Deflector; 355. pH monitor; 36. First conversion pump; 37. Second conversion pump; 4. Hydrochloric acid absorption tower; 401. Cooling absorption chamber; 41. Gas-liquid distribution chamber; 411. Liquid distributor; 412. Inlet pipe; 42. Absorption cooling chamber; 43. Graphite absorption strip; 4301. Large-diameter curved surface; 4302. Small-diameter curved surface; 4303. Large-diameter docking surface; 4304. Small-diameter docking surface; 44. Switching plate; 4401. Through hole; 4402. Docking port; 4403. Through groove; 4404. Guide groove; 441. Universal lining plate; 442. Switching baffle; 443. Belt moving assembly; 4431. Absorption strip connecting piece; 4432. Baffle connecting piece; 4433. Straight rod connecting piece; 4434. Rotating connecting piece; 4435. Sliding connecting piece; 444. Telescopic driving piece; 5. Discharge pipe. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Refer to Figure 1-7 , a liquid chlorine gasification safety maintenance and treatment system, including a storage chamber 1, an absorption pump 2, a chlorine absorption tower 3 and a hydrochloric acid absorption tower 4. At least one liquid chlorine storage tank is installed in the storage chamber 1. The liquid chlorine tank truck can transport and inject liquid chlorine into the liquid chlorine storage tank for temporary storage, and then gasify the liquid chlorine in the liquid chlorine storage tank into chlorine according to the required chlorine temperature and pressure of the chlorotoluene device through a liquid chlorine vaporizer.

[0041] A chlorine gas automatic detection alarm and an induced draft fan are also installed in the storage chamber 1. The chlorine gas automatic detection alarm is electrically connected to the absorption pump 2 and the induced draft fan to achieve interlock control. When a leakage accident occurs in the liquid chlorine storage tank in the storage chamber 1, the chlorine gas automatic detection alarm in the storage chamber 1 immediately interlocks to close each entrance and exit of the storage chamber 1, and interlocks to start the induced draft fan and the absorption pump 2 to suck the leaked chlorine gas into the chlorine absorption tower 3 for treatment.

[0042] The chlorine absorption tower 3 includes an absorption tower main body 31, a spray pipe 32, a tray 33, an alkali liquid feeder 34 and a separation discharge assembly 35. The absorption pump 2 injects the leaked chlorine gas in the storage chamber 1 into the bottom of the absorption tower main body 31. A plurality of trays 33 are horizontally installed inside the absorption tower main body 31, and a spray pipe 32 is further arranged between every two trays 33. The spray pipe 32 is connected to the alkali liquid feeder 34. After the chlorine gas is injected into the absorption tower main body 31, the alkali liquid feeder 34 continuously pumps alkali liquid into the spray pipe 32. Each spray pipe 32 sprays the alkali liquid onto the lower tray 33, and contacts with the chlorine gas floating upward and diffusing to react and absorb the chlorine gas.

[0043] The separation discharge assembly 35 is installed at the lower end of the absorption tower main body 31. The separation discharge assembly 35 includes a partition plate 351, a central enclosing plate 352, an adjustment motor 353 and a separation cover plate 354. The central enclosing plate 352 is arranged at the central position of the lower end of the absorption tower main body 31. The partition plates 351 are symmetrically installed outside the central enclosing plate 352 and are integrally connected to the inner wall of the absorption tower main body 31 to divide the annular space formed by the central enclosing plate 352 and the inner wall of the absorption tower main body 31 into two parts. The adjustment motor 353 is installed inside the space enclosed by the central enclosing plate 352. The separation cover plate 354 is installed at the upper end of the adjustment motor 353, and the adjustment motor 353 can drive the separation cover plate 354 to rotate circumferentially.

[0044] The separation cover plate 354 includes a covering piece 3541 and a diversion plate 3542. The covering piece 3541 covers the upper opening of the central enclosing plate 352 to seal the inside of the central enclosing plate 352, preventing the reaction liquid after the alkali liquid absorbs the chlorine gas from flowing down and entering the inside of the central enclosing plate 352 to damage the adjustment motor 353. The diversion plate 3542 is connected to the covering piece 3541. The diversion plate 3542 can completely cover half of the annular space formed by the central enclosing plate 352 and the inner wall of the absorption tower main body 31. The upper surface of the diversion plate 3542 is inclined from the side close to the inner wall of the absorption tower main body 31 to the side close to the covering piece 3541 from top to bottom. The adjustment motor 353 drives the separation cover plate 354 to rotate to a position where the straight edge of the diversion plate 3542 just coincides with the partition plate 351. At this time, the separation cover plate 354 covers and seals the inside of the central enclosing plate 352 and half of the annular space formed by the central enclosing plate 352 and the inner wall of the absorption tower main body 31, and only the other half of the open annular space can receive the reaction liquid after absorbing the chlorine gas.

[0045] A pair of liquid outlets 301 are provided on the bottom plate of the absorption tower main body 31, and the two liquid outlets 301 are respectively communicated with two semi-circular spaces separated by the partition plate 351. After the isolation cover plate 354 shields and seals one semi-circular space, all the reaction liquid will fall into or be guided by the guide plate 3542 into the other open semi-circular space, and be discharged from the liquid outlet 301 communicated with this semi-circular space. A pair of pH monitors 355 are also installed on the bottom plate of the absorption tower main body 31, and the pH monitors 355 can respectively monitor the pH values of the reaction liquid collected in the two semi-circular spaces in real time. If the pH value of the reaction liquid is higher than 10, the discharged reaction liquid will be pumped back into the spray pipe 32 by the first transfer pump 36 to continue absorbing chlorine gas.

[0046] If the pH value of the reaction liquid is lower than 10, the adjustment motor 353 drives the isolation cover plate 354 to rotate half a circle to open the other semi-circular space, and at the same time closes the semi-circular space storing the reaction liquid with a pH value lower than 10. At this time, the first transfer pump 36 is switched to communicate with the discharge pipe 5 to discharge the reaction liquid, and the second transfer pump 37 communicated with the newly opened semi-circular space is connected to the spray pipe 32 and the alkali liquid feeder 34 at this time. The alkali liquid feeder 34 supplies new alkali liquid with a pH value greater than 10 to the spray pipe 32 through the second transfer pump 37. The reaction liquid after the new alkali liquid reacts with and absorbs chlorine gas is pumped back to the spray pipe 32 by the second transfer pump 37 for circulating spray absorption before the pH value drops below 10. After the pH value of the reaction liquid drops below 10, the adjustment motor 353 rotates back to its original position again. At this time, the second transfer pump 37 is communicated with the discharge pipe 5, and the first transfer pump 36 is communicated with the alkali liquid feeder 34.

[0047] The above-mentioned switching process circulates continuously. After the new alkali liquid is injected into the absorption tower main body 31 for spray absorption, the reaction liquid will not be mixed with the previous reaction liquid with a pH value lower than 10, which can effectively ensure the spray absorption effect of the new alkali liquid and prevent waste.

[0048] The discharge pipe 5 is communicated with the hydrochloric acid absorption tower 4. The hydrochloric acid absorption tower 4 includes a gas-liquid distribution chamber 41, an absorption and cooling chamber 42, graphite absorption strips 43 and a switching plate 44. A liquid distributor 411 is installed inside the gas-liquid distribution chamber 41. The sodium chloride absorption liquid is evenly dispersed and falls in the gas-liquid distribution chamber 41 by the liquid distributor 411. An inlet pipe 412 leading into the gas-liquid distribution chamber 41 is also installed outside the gas-liquid distribution chamber 41. The tail gas containing a large amount of hydrochloric acid gas generated by the chlorotoluene device will be sent into the gas-liquid distribution chamber 41 through the inlet pipe 412 to be fully mixed with the sodium chloride absorption liquid.

[0049] The absorption cooling chamber 42 is installed at the lower end of the gas-liquid distribution chamber 41. A switching plate 44 separates the gas-liquid distribution chamber 41 and the absorption cooling chamber 42. A switching plate 44 is also installed at the lower end of the absorption cooling chamber 42. Four enclosing plates connected in pairs are erected between the two switching plates 44. The length and width of each enclosing plate are the same, so as to cooperate with the two switching plates 44 in the absorption cooling chamber 42 to form a cooling absorption cavity 401 with a square bottom. A coolant inlet pipe and an outlet pipe communicating with the cooling absorption cavity 401 are arranged outside the absorption cooling chamber 42. External coolant is injected into the cooling absorption cavity 401 from the inlet pipe and discharged from the outlet pipe after heat exchange.

[0050] A plurality of graphite absorption strips 43 are arranged in an array between the two switching plates 44. The graphite absorption strip 43 has a large-diameter curved surface 4301, a small-diameter curved surface 4302, two large-diameter butt surfaces 4303 and two small-diameter butt surfaces 4304. The large-diameter curved surface 4301 is one-fourth of the circumference of a cylinder, and the small-diameter curved surface 4302 is also one-fourth of the circumference of a cylinder. The large-diameter curved surface 4301 and the small-diameter curved surface 4302 are arranged oppositely and bend in two opposite directions respectively. The two large-diameter butt surfaces 4303 are arranged on both sides of the large-diameter curved surface 4301, and the two small-diameter butt surfaces 4304 are arranged on both sides of the small-diameter curved surface 4302. The large-diameter butt surface 4303 and the small-diameter butt surface 4304 on the same side are perpendicular to each other.

[0051] Each graphite absorption strip 43 is distributed in a cross-symmetric array. The graphite absorption strip 43 can move in the extending direction of the connecting line of the centers of the large-diameter curved surface 4301 and the small-diameter curved surface 4302. When the four graphite absorption strips 43 move towards the center of the small-diameter curved surface 4302 at the same time, the small-diameter curved surfaces 4302 of the graphite absorption strips 43 can surround a cylindrical tube. Similarly, when the four graphite absorption strips 43 move towards the center of the large-diameter curved surface 4301 at the same time, the large-diameter curved surfaces 4301 of the graphite absorption strips 43 can also surround a cylindrical tube. When the large-diameter curved surface 4301 or the small-diameter curved surface 4302 surrounds a cylindrical tube, the large-diameter butt surfaces 4303 or the small-diameter butt surfaces 4304 will also be closely butted against each other to further enclose the inner cavity of the cylindrical tube surrounded by the graphite absorption strips 43. It is worth mentioning that the diameter of the cylindrical tube surrounded by the large-diameter curved surface 4301 is larger than the diameter of the cylindrical tube surrounded by the small-diameter curved surface 4302.

[0052] The switching board 44 includes a general lining plate 441, a switching baffle 442 and a belt moving assembly 443. The four sides of the general lining plate 441 are closely attached to the four walls of the absorption cooling chamber 42, and the upper and lower ends of the general lining plate 441 are closely attached to the graphite absorption strips 43. According to the arrangement rule of the graphite absorption strips 43, a through hole 4401 is opened at each position where the cylindrical tube can be formed by each graphite absorption strip 43. The diameter of each through hole 4401 is the same as the diameter of the cylindrical tube formed by the corresponding graphite absorption strip 43. After the graphite absorption strips 43 are spliced into a cylindrical tube at the position of the through hole 4401, the hydrogen chloride gas and the absorption liquid in the gas-liquid distribution chamber 41 can enter the cylindrical tube formed by the spliced graphite absorption strips 43 through the through hole 4401 and continue to be absorbed. Among them, the absorption liquid forms a liquid film on the inner wall of the cylindrical tube, and the hydrogen chloride gas flows in the same direction as the absorption liquid in the cylindrical tube and is fully contacted with the absorption liquid and absorbed.

[0053] The graphite absorption strip 43 is arranged inside the cooling absorption cavity 401. When the graphite absorption strips 43 are spliced and surrounded into a cylindrical tube, the outside of the cylindrical tube will be immersed in the cooling liquid in the cooling absorption cavity 401. The heat of solution of the hydrogen chloride gas inside the graphite absorption strip 43 will be transferred to the cooling liquid through the graphite absorption strip 43 and finally be taken out of the device.

[0054] A plurality of switching baffles 442 are arranged on the side of the general lining plate 441 away from the graphite absorption strips 43. The switching baffles 442 are arranged parallel to each other and completely cover the part of the general lining plate 441 where the through holes 4401 are opened. The switching baffles 442 are provided with a plurality of docking ports 4402. The distance between two adjacent docking ports 4402 is twice the distance between two adjacent through holes 4401. It can be understood that the distance between two adjacent through holes 4401 with the same diameter is the same as the distance between two adjacent docking ports 4402. When a switching baffle 442 moves to make the docking port 4402 correspond to all the through holes 4401 of the same diameter in a row / column, it will block and close all the through holes 4401 of the other diameter in that row / column. The switching baffle 442 is connected to a telescopic driving member 444, and the telescopic driving member 444 can drive the switching baffle 442 to move so that the docking port 4402 of the switching baffle 442 can correspond to the through holes 4401 with different diameters.

[0055] Four through slots 4403 are symmetrically arranged in a cross shape around the periphery of each through hole 4401. The through slots 4403 are arranged below the graphite absorption strip 43. The upper end of the through slot 4403 has a guiding slot 4404. The guiding slot 4404 extends along the direction of the line connecting the centers of two adjacent through holes 4401. The belt moving component 443 is installed in the through slot 4403. The belt moving component 443 includes an absorption strip connecting piece 4431 and a baffle connecting piece 4432. The absorption strip connecting piece 4431 passes through the guiding slot 4404 and is connected to the graphite absorption strip 43. The baffle connecting piece 4432 is connected to the switching baffle 442. The absorption strip connecting piece 4431 can move horizontally in the direction of the line connecting the centers of two adjacent through holes 4401 under the guidance of the guiding slot 4404.

[0056] The absorption strip connecting pieces 4431 and the baffle connecting pieces 4432 in two opposite through slots 4403 are connected by two different devices, namely a straight rod connecting piece 4433 and a rotating connecting piece 4434 respectively. Among them, the two ends of the straight rod connecting piece 4433 are respectively connected to the absorption strip connecting piece 4431 and the baffle connecting piece 4432, so that the graphite absorption strip 43 can move in the same direction as the switching baffle 442. The central position of the rotating connecting piece 4434 has a rotation axis with a fixed position. The rotating connecting piece 4434 can rotate axially around this axis. Two sliding connecting pieces 4435 are installed at both ends of the rotating connecting piece 4434. The sliding connecting pieces 4435 can rotate axially around the ends of the rotating connecting piece 4434 and are vertically and slidably connected to the absorption strip connecting piece 4431 and the baffle connecting piece 4432 respectively. When the switching baffle 442 moves in one direction, it will push the rotating connecting piece 4434 to rotate, so as to pull the graphite absorption strip 43 in the opposite direction. In this way, when the switching baffle 442 moves in one direction, the two opposite graphite absorption strips 43 will move in two opposite directions.

[0057] The switching baffles 442 of the switching plate 44 above and below the graphite absorption strip 43 are arranged to move in perpendicular directions to control the movement of the graphite absorption strip 43 around the through holes 4401. When there is no chlorine leakage, the absorption liquid is injected into the gas-liquid distribution chamber 41 at a fixed flow rate from the outside to absorb the tail gas containing a large amount of hydrochloric acid gas generated by the chlorinated toluene device. At this time, the telescopic driving member 444 drives the switching baffle 442 to move to the through hole 4401 with a smaller diameter corresponding to the docking port 4402. At the same time, the graphite absorption strip 43 is also driven to move, and the through holes 4401 with smaller diameters approach each other to form a closed cylinder. The hydrochloric acid gas and the absorption liquid can enter the smaller-diameter cylinder formed by the spliced graphite absorption strips 43 through the through holes 4401 for further absorption. At this time, the flow rate of the absorption liquid is small, and a liquid film can be formed on the inner wall of the smaller-diameter cylinder. When chlorine leakage occurs, the waste liquid generated by the chlorine absorption tower 3 in treating chlorine is also injected into the gas-liquid distribution chamber 41 to participate in the absorption of hydrochloric acid gas. At this time, the flow rate of the absorption liquid increases, and the telescopic driving member 444 drives the switching baffle 442 to move to the through hole 4401 with a larger diameter corresponding to the docking port 4402. At the same time, the graphite absorption strip 43 is also driven to move, and the through holes 4401 with larger diameters approach each other to form a closed cylinder, so that the absorption liquid with an increased flow rate can still form a liquid film on the inner wall of the cylinder to smoothly absorb the hydrochloric acid gas.

[0058] A method for safety maintenance and treatment of liquid chlorine gasification includes the following steps:

[0059] S1: When a leakage accident occurs in the liquid chlorine storage tank in the storage chamber 1, the chlorine gas automatic detection alarm in the storage chamber 1 immediately interlocks to close all the entrances and exits of the storage chamber 1, and simultaneously interlocks to start the induced draft fan and the absorption pump 1 to pump the leaked chlorine gas into the chlorine absorption tower 3 for treatment;

[0060] S2: The reaction liquid after being treated by the chlorine absorption tower 3 is injected into the hydrochloric acid absorption tower 4, and the tail gas containing a large amount of hydrochloric acid gas from the chlorinated toluene device is sent to the hydrochloric acid absorption tower 4 for absorption;

[0061] S3: Separate the discharge after absorption by the hydrochloric acid absorption tower 4 to separately collect the generated hydrochloric acid and sodium hypochlorite.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0063] In the present invention, unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The control mode of the present invention is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The provision of power also belongs to the common general knowledge in the art. And the present invention is mainly used to protect mechanical devices, so the control mode and circuit connection of the present invention will not be further explained in detail.

[0065] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A safety maintenance and treatment system for liquid chlorine gasification, comprising a storage chamber (1), an absorption pump (2), a chlorine gas absorption tower (3) and a hydrochloric acid absorption tower (4). The absorption pump (2) is installed in the storage chamber (1) for transporting the leaked chlorine gas to the chlorine gas absorption tower (3) for treatment. It is characterized in that: The chlorine gas absorption tower (3) is communicated with the hydrochloric acid absorption tower (4). The hydrochloric acid absorption tower (4) includes a gas-liquid distribution chamber (41), an absorption and cooling chamber (42), graphite absorption strips (43) and two switching plates (44). The gas-liquid distribution chamber (41) and the absorption and cooling chamber (42) are separated by a switching plate (44). The two switching plates (44) are arranged parallel to each other up and down. A plurality of graphite absorption strips (43) are arranged between the two switching plates (44); The switching plate (44) includes a general lining plate (441), a switching baffle (442) and a belt moving component (443). The general lining plate (441) is provided with a plurality of through holes (4401) in an array. The switching baffle (442) is provided with a plurality of docking ports (4402). Four through grooves (4403) are arranged on the periphery of the through hole (4401). The belt moving component (443) is installed in the through groove (4403); The graphite absorption strip (43) has a large-diameter curved surface (4301), a small-diameter curved surface (4302), a large-diameter docking surface (4303) and a small-diameter docking surface (4304). The graphite absorption strips (43) are arranged in a cross-symmetric array. The large-diameter curved surfaces (4301) and the small-diameter curved surfaces (4302) of each graphite absorption strip (43) can respectively form cylindrical barrels with different diameters.

2. The chlorine gasification safety maintenance and treatment system according to claim 1, wherein: The graphite absorption strips (43) are arranged in an array. Every four graphite absorption strips (43) are cross-symmetric with each other. The large-diameter curved surface (4301) and the small-diameter curved surface (4302) are respectively one-fourth of the circumferences of two cylindrical surfaces with different diameters. The large-diameter curved surface (4301) and the small-diameter curved surface (4302) are arranged oppositely and bend in two opposite directions respectively.

3. The chlorine vaporization safety maintenance and treatment system according to claim 2, characterized in that: The through holes (4401) are opened at the cross-symmetric centers of every four graphite absorption strips (43) according to the arrangement positions of the graphite absorption strips (43).

4. The chlorine gasification safety maintenance and treatment system according to claim 1, wherein: A plurality of switching baffles (442) are arranged on the side of the general lining plate (441) away from the graphite absorption strips (43). The switching baffles (442) are arranged parallel to each other. The switching baffles (442) are driven to move by a telescopic driving member (444).

5. The chlorine gasification safety maintenance and treatment system according to claim 1, characterized in that: The distance between two adjacent docking ports (4402) is twice the distance between two adjacent through holes (4401).

6. The chlorine gasification safety maintenance and treatment system according to claim 1, wherein: The four through grooves (4403) are cross-symmetrically arranged on the periphery of the through hole (4401). The belt moving component (443) includes an absorption strip connecting member (4431) and a baffle connecting member (4432). The absorption strip connecting member (4431) is connected to the graphite absorption strip (43), and the baffle connecting member (4432) is connected to the switching baffle (442).

7. The liquid chlorine gasification safety maintenance and treatment system according to claim 6, characterized in that: Two adjacent through slots (4403) out of the four through slots (4403) are provided with straight rod connectors (4433), and the other two through slots (4403) are provided with rotary connectors (4434). Both ends of the straight rod connector (4433) are respectively connected to an absorption strip connector (4431) and a baffle connector (4432). The central position of the rotary connector (4434) has a rotation shaft with a fixed position, and the rotary connector (4434) can perform axial rotation around this axis. Each end of the rotary connector (4434) is equipped with a sliding connector (4435). The sliding connector (4435) can perform axial rotation around the end of the rotary connector (4434) and is vertically and slidably connected to the absorption strip connector (4431) and the baffle connector (4432) respectively.

8. The processing method of a liquid chlorine gasification safety maintenance and treatment system according to any one of claims 1-7, characterized in that, Comprising the following steps: S1: When a leakage accident occurs to the liquid chlorine storage tank in the storage chamber (1), the chlorine gas automatic detection alarm in the storage chamber (1) immediately interlocks to close each entrance and exit of the storage chamber (1), and interlocks to start the induced draft fan and the absorption pump (2) to pump the leaked chlorine gas into the chlorine gas absorption tower (3) for treatment; S2: The reaction liquid after being treated by the chlorine gas absorption tower (3) is injected into the hydrochloric acid absorption tower (4), and the tail gas containing a large amount of hydrochloric acid gas from the chlorotoluene device is sent to the hydrochloric acid absorption tower (4) for absorption; S3: Separate the discharge after absorption by the hydrochloric acid absorption tower (4), and separately collect the generated hydrochloric acid and sodium hypochlorite.

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