A hydrogen sulfide pretreatment system

Abstract

The present invention discloses a hydrogen sulfide pretreatment system related to the field of waste gas treatment technology. It comprises: a tower body, the tower body is provided with a liquid discharge port, an air inlet and an air outlet in sequence from bottom to top, the tower body is fixedly connected to a liquid circulation system connected to the liquid discharge port; a cap-shaped part is fixedly connected to the tower body, the cap-shaped part is installed with a liquid storage push rod, the cap-shaped part is sealed and slidably connected with a sealing plate, the sealing plate and the cap-shaped part together form a liquid storage chamber connected to the liquid circulation system. The present invention temporarily stores part of the spray liquid in the liquid storage chamber, and sprays out the spray liquid in the liquid storage chamber when problems occur in the valve, pipeline and infusion pump resulting in an imbalance in the liquid-gas ratio, adjusts the flow rate of the spray liquid in the tower body, maintains a stable liquid-gas ratio, and further maintains the absorption and dissolution efficiency of the spray liquid on hydrogen sulfide in the waste gas, so that the waste gas can be discharged into the atmosphere in compliance with the standards, and at the same time, there is no need to stop the machine for maintenance, thus avoiding the economic losses caused by the shutdown of the production line.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a hydrogen sulfide pretreatment system. Background Art

[0002] Hydrogen sulfide is a highly toxic and corrosive gas that is widely present in industrial fields such as oil and gas extraction, sewage treatment and chemical production. In the chemical production process, this gas is usually generated in the form of waste gas, which needs to be treated by dust removal, cooling and desulfurization to ensure that its concentration meets the emission standards before it can be discharged into the atmosphere. At present, the spray tower process is widely used in industry to absorb and treat hydrogen sulfide in the waste gas by circulating sodium hydroxide solution (mainly generating sodium sulfide or sodium hydrosulfide). The key to its treatment efficiency depends on the precise control of the liquid-gas ratio, that is, the ratio of the alkali solution spray volume to the waste gas flow is dynamically adjusted according to the real-time monitored hydrogen sulfide concentration. However, in actual operation, equipment reliability issues will cause liquid-gas ratio imbalance, which is manifested in The reasons are: the valve system fails to open and close due to scaling, corrosion or mechanical wear (i.e. the alkali solution spray volume cannot be freely adjusted), which will directly lead to the inability to adjust the flow of the spray liquid when the hydrogen sulfide concentration fluctuates. In addition, the flow rate drops due to cavitation or wear of the infusion pump impeller, and the abnormal fluid resistance caused by pipeline blockage, resulting in a decrease in the spray liquid flow rate. The above two situations will lead to an imbalance in the ratio of alkali solution spray volume and exhaust gas flow, resulting in excessive hydrogen sulfide concentration in the exhaust gas. At the same time, in continuous chemical production equipment, the spray tower is often highly coupled with the upstream process unit. Once the desulfurization system needs to be shut down for maintenance, it often leads to unplanned shutdown of the entire production line, which will bring direct economic losses to the company. Summary of the Invention

[0003] The present invention provides a hydrogen sulfide pretreatment system to overcome the shortcomings of existing spray towers during use, such as problems with valves, infusion pumps and pipelines leading to an imbalance in the liquid-to-gas ratio, resulting in excessive hydrogen sulfide concentration in the discharged gas or production line shutdown for maintenance, causing economic losses to the enterprise.

[0004] Technical solution: A hydrogen sulfide pretreatment system, comprising:

[0005] A tower body, wherein the tower body is provided with a liquid discharge port, an air inlet, and an air discharge port in sequence from bottom to top; the tower body is fixedly connected to a liquid circulation system in communication with the liquid discharge port; the liquid circulation system is fixedly connected to and in communication with a branch spray rack and a top spray rack located in the tower body;

[0006] A cap-shaped member is fixedly connected to the tower body, the cap-shaped member is located above the top spray rack, the cap-shaped member is equipped with a liquid storage push rod, the cap-shaped member is sealed and slidably connected to a sealing plate that is rotatably connected to the telescopic end of the liquid storage push rod, the sealing plate and the cap-shaped member together form a liquid storage cavity connected to the liquid circulation system, the support spray rack, the top spray rack and the lower side of the sealing plate are all fixedly connected to a number of spray heads, the support spray rack, the top spray rack and the liquid storage cavity are respectively connected to the adjacent spray heads, and an electrochemical sensor for monitoring the hydrogen sulfide concentration therein is installed in the tower body.

[0007] Furthermore, a blocking float is connected to the inner limiting sliding connection of the cap-shaped member, and the blocking float is used to monitor the liquid level of the liquid storage chamber and control the connection state between the liquid circulation system and the liquid storage chamber. Pressure valves are installed at the connection points between the branch spray rack and the top spray rack and the liquid circulation system to control the flow path of the spray liquid in the liquid circulation system.

[0008] Furthermore, it also includes:

[0009] A processing push rod is fixedly connected to the tower body, wherein the telescopic end of the processing push rod passes through the tower body and is fixedly connected to a shielding plate slidably connected to the tower body, and the shielding plate is provided with a through slot;

[0010] a connecting pipe, which is sealed and slidably connected to and communicates with the top spray rack; the connecting pipe is sealed and slidably connected to and communicates with the middle spray rack, the middle spray rack is located below the top spray rack, and the shapes of the middle spray rack and the top spray rack correspond to the shape of the through slot;

[0011] The limiting column is slidably connected to the blocking plate, and a spring is fixed between the two. The middle spray rack is provided with a limiting groove, and the limiting groove is used to limit the limiting column. The top spray rack and the middle spray rack are both used to squeeze the limiting column.

[0012] Furthermore, the cap-shaped part is provided with a through hole, and a one-way seal is slidably connected in the through hole of the cap-shaped part. The one-way seal is used to control the connectivity state of the through hole on the cap-shaped part, and the blocking plate is used to push the one-way seal to move to assist the one-way seal in adjusting the connectivity state of the through hole on the cap-shaped part.

[0013] Furthermore, the minimum distance between the top spray rack and the middle spray rack on the central axis of the connecting pipe is smaller than the minimum distance between the spray heads on the top spray rack and the middle spray rack on the central axis of the connecting pipe.

[0014] Furthermore, it also includes:

[0015] The mounting frame is fixedly connected to the cap-shaped member. The sealing plate is provided with an inclined groove. The mounting frame slides in the inclined groove to guide the movement of the sealing plate.

[0016] Furthermore, it also includes:

[0017] An air cylinder is arranged on one side of the tower body close to the air inlet. The tower body is provided with an air storage port at the same height as the air inlet. The air storage port is communicated with the air cylinder. A piston is sealingly and slidingly connected inside the air cylinder. The air cylinder is used to temporarily store excess gas in the tower body to maintain a stable pressure in the tower body.

[0018] Furthermore, it also includes:

[0019] Multiple annular baffles are fixed between the cap-shaped member and the tower body through brackets, and the central axes of all the annular baffles are collinear. The gaps between two adjacent annular baffles are equal. The annular baffles are used to promote condensation of spray liquid droplets in the gas.

[0020] Furthermore, the side of the annular baffle close to its central axis has multiple windward sides and multiple leeward sides that are staggered, and the windward side is provided with multiple shielding rings. The shielding ring close to the exhaust port side on the same windward side is directly fixed to the adjacent annular baffle, and the remaining shielding rings on the same windward side are fixed to the adjacent annular baffles with connecting blocks, and the shielding rings are used to increase the amount of droplets captured.

[0021] Furthermore, on the same windward side, there are gaps between the shielding rings except the shielding ring close to the exhaust port and the windward side, so as to allow the mist droplets captured by the shielding rings to quickly aggregate into large particle droplets and drip.

[0022] Compared with the prior art, the present invention has the following advantages: the present invention temporarily stores part of the spray liquid in the liquid storage chamber, and sprays out the spray liquid in the liquid storage chamber when problems occur in the valves, pipelines and infusion pumps resulting in an imbalance in the liquid-gas ratio, thereby adjusting the flow rate of the spray liquid in the tower body, maintaining a stable liquid-gas ratio, and thereby maintaining the absorption and dissolution efficiency of the spray liquid on hydrogen sulfide in the waste gas, so that the waste gas can be discharged into the atmosphere in compliance with the standards, and at the same time, there is no need to shut down for maintenance, thereby avoiding economic losses caused by production line shutdowns.

[0023] The treatment chamber is composed of a baffle plate, a middle spray rack, a cap-shaped part and a tower body to intermittently treat the waste gas containing high-concentration hydrogen sulfide separately, prolong the contact reaction time between the waste gas and the spray liquid, improve the absorption and treatment efficiency of the spray liquid on hydrogen sulfide in the waste gas, and enable the waste gas to meet the emission standards.

[0024] An annular flow channel composed of two adjacent annular baffles is used for the flow of exhaust gas, and the flow areas corresponding to different heights of the annular flow channel are different, so that the flow velocity of the exhaust gas at different heights of the annular flow channel is different. In this way, the flow velocity of the exhaust gas in the annular flow channel varies within a flow velocity range, and the optimal flow velocity is included in the flow velocity range, so that when the exhaust gas flow fluctuates, the annular baffle's capture efficiency of the droplets in the exhaust gas remains stable, thereby maintaining the stability of the annular baffle's exhaust gas demisting efficiency, and providing protection for subsequent exhaust gas treatment equipment.

[0025] The gap between the annular baffle and the shielding ring is used to cause the droplets on the same windward side to quickly gather into large droplets and drip, thereby improving the droplet detachment efficiency on the surface of the annular baffle and reducing the probability of droplets entrained in the exhaust gas, thereby maintaining the annular baffle's efficiency in capturing droplets in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 Schematic diagram of the three-dimensional structure of the spray support frame and the cap-shaped member of the present invention;

[0028] Figure 3 Schematic diagram of the three-dimensional structure of the cap-shaped member and the shielding plate of the present invention;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of the spray rack and the one-way sealing cylinder in the present invention;

[0030] Figure 5 Schematic diagram of the three-dimensional structure of the top spray rack and the sealing plate of the present invention;

[0031] Figure 6 A sectional view of the three-dimensional structure of the cap-shaped member and the sealing plate of the present invention;

[0032] Figure 7 It is a sectional view of the three-dimensional structure of the connecting pipe and the middle spray rack of the present invention;

[0033] Figure 8 This is a sectional view of the three-dimensional structure of the shielding plate and the middle spray rack of the present invention;

[0034] Figure 9 Schematic diagram of the three-dimensional structure of the sealing plate and the mounting frame of the present invention;

[0035] Figure 10 It is a sectional view of the three-dimensional structure of the annular baffle and the shielding ring of the present invention.

[0036] In the above drawings: 1-tower body, 101-air inlet, 102-exhaust port, 103-liquid discharge port, 104-gas storage port, 2-liquid circulation system, 3-spray rack, 4-top spray rack, 5-cap-shaped part, 6-liquid storage push rod, 7-sealing plate, 701-liquid storage chamber, 8-spray head, 9-sealing float, 10-processing push rod, 11-blocking plate, 111-through groove, 12-connecting pipe, 13-middle spray rack, 14-limiting column, 141-limiting groove, 15-one-way sealing cylinder, 16-mounting frame, 161-inclined groove, 17-gas storage cylinder, 18-piston, 19-annular baffle, 191-windward side, 192-leeward side, 20-blocking ring, 21-connecting block. DETAILED DESCRIPTION

[0037] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings.

[0038] A hydrogen sulfide pretreatment system, see Figures 1-6 , comprising: a tower body 1, the tower body 1 is provided with a liquid discharge port 103, an air inlet 101 and an exhaust port 102 in sequence from bottom to top, the tower body 1 is fixedly connected to a liquid circulation system 2 connected to the liquid discharge port 103, the liquid circulation system 2 is fixedly connected and connected to a support spray rack 3 and a top spray rack 4 located in the tower body 1; a cap-shaped member 5 is fixedly connected to a position of the tower body 1 near the exhaust port 102, the cap-shaped member 5 is located above the top spray rack 4, the cap-shaped member 5 is installed with a liquid storage push rod 6, the cap-shaped member 5 is sealed and slidably connected to a sealing plate 7 rotatably connected to the telescopic end of the liquid storage push rod 6, the sealing plate 7 and the cap-shaped member 5 together form a liquid storage cavity 701 connected to the liquid circulation system 2, the liquid storage cavity 7 01 is used to store spray liquid for emergency use. Several spray heads 8 are fixed to the lower sides of the support spray rack 3, the top spray rack 4 and the sealing plate 7. The support spray rack 3, the top spray rack 4 and the liquid storage chamber 701 are respectively connected to the adjacent spray heads 8. An electrochemical sensor for monitoring the concentration of hydrogen sulfide therein is installed in the tower body 1; a sealing float 9 is slidingly connected in a limited position in the cap-shaped part 5. The sealing float 9 is used to monitor the liquid level of the liquid storage chamber 701 and control the connection status between the liquid circulation system 2 and the liquid storage chamber 701. Pressure valves are installed at the connection points between the support spray rack 3 and the top spray rack 4 and the liquid circulation system 2 to control the flow path of the spray liquid in the liquid circulation system 2.

[0039] The above scheme aims to solve the problem that during the use of the existing spray tower, the liquid-gas ratio is imbalanced due to problems with valves, infusion pumps and pipelines, resulting in excessive concentration of hydrogen sulfide in the discharged gas or shutdown of the production line for maintenance, which causes economic losses to the enterprise. This scheme temporarily stores part of the spray liquid in the liquid storage chamber 701, and when problems with the valves, pipelines and infusion pumps cause the liquid-gas ratio to be imbalanced, the spray liquid in the liquid storage chamber 701 is sprayed out, the flow rate of the spray liquid in the tower body 1 is adjusted, and a stable liquid-gas ratio is maintained, thereby maintaining the absorption and dissolution efficiency of the spray liquid on hydrogen sulfide in the exhaust gas, so that the exhaust gas can be discharged into the atmosphere in compliance with the standards without the need to shut down for maintenance, thereby avoiding economic losses caused by shutdown of the production line. The liquid circulation system 2 is used to circulate the spray liquid in the tower body 1. The liquid circulation system 2 can monitor the pH value of the spray liquid in real time and maintain the stability of the pH value of the spray liquid. The liquid circulation system 2 is an existing device and will not be described in detail here. A partition net (such as Figure 2 as shown), to form a filler layer.

[0040] An exhaust valve can be installed on the upper side of the cap-shaped member 5 to reduce the volume of the gas in the liquid storage chamber 701 and reduce the impact of the gas in the liquid storage chamber 701 on its internal pressure; the number of spray heads 8 is determined according to factors such as the inner diameter of the tower body 1 and the pressure in the liquid circulation system 2 during actual use, and is not limited here; the number of electrochemical sensors can be two, and one of them is installed on the inner side of the air inlet 101 to detect the initial concentration of hydrogen sulfide in the exhaust gas before treatment, and the other is installed on the lower side of the cap-shaped member 5 to detect the exhaust gas to be discharged. The concentration of hydrogen sulfide in the exhaust gas; the tower body 1 is equipped with a control terminal, which is electrically connected to the liquid circulation system 2, the electrochemical sensor and the liquid storage push rod 6; the sealing float 9 and the pressure valves at the connection between the support spray rack 3 and the top spray rack 4 and the liquid circulation system 2 are used to ensure that the spray liquid in the liquid circulation system 2 can be discharged through the support spray rack 3 and the top spray rack 4 only after filling the liquid storage chamber 701; the spray head 8 on the sealing plate 7 adopts a pressure-triggered nozzle, that is, the spray head 8 can only be opened when the pressure in the liquid storage chamber 701 reaches a threshold.

[0041] See also Figure 3-Figure 5 and Figure 7-Figure 9, also includes: a processing push rod 10, fixedly connected to the tower body 1, the telescopic end of the processing push rod 10 passes through the tower body 1 and is fixedly connected to a baffle plate 11 slidably connected to the tower body 1, and the baffle plate 11 is provided with a through slot 111; a connecting pipe 12, sealed and slidably connected and connected to the top spray rack 4, the connecting pipe 12 is sealed and slidably connected and connected to the middle spray rack 13, the middle spray rack 13 is located below the top spray rack 4, and the shapes of the middle spray rack 13 and the top spray rack 4 correspond to the shape of the through slot 111; a limiting column 14, slidably connected to the baffle plate 11, and a spring is fixed between the two, and the middle spray rack 13 is provided with a limiting slot 141, The limiting groove 141 is used to limit the limiting column 14, and the top spray rack 4 and the middle spray rack 13 are both used to squeeze the limiting column 14; the cap-shaped member 5 is provided with a through hole, and a one-way seal 15 is slidably connected in the through hole of the cap-shaped member 5, and the one-way seal 15 is used to control the connectivity state of the through hole on the cap-shaped member 5, and the blocking plate 11 is used to push the one-way seal 15 to move to assist the one-way seal 15 in adjusting the connectivity state of the through hole on the cap-shaped member 5; the minimum distance between the top spray rack 4 and the middle spray rack 13 on the central axis of the connecting pipe 12 is less than the minimum distance between the spray head 8 on the top spray rack 4 and the middle spray rack 13 on the central axis of the connecting pipe 12.

[0042] In the above scheme, the shielding plate 11, the middle spray rack 13, the cap-shaped member 5 and the tower body 1 are used to form a processing chamber, so as to treat the waste gas containing high concentration of hydrogen sulfide intermittently and separately, prolong the contact reaction time between the waste gas and the spray liquid, improve the absorption and treatment efficiency of the spray liquid on hydrogen sulfide in the waste gas, and enable the waste gas to meet the discharge standards; the through groove 111 is used to "accommodate" the middle spray rack 13 when the shielding plate 11 and the middle spray rack 13 are at the same height, and at the same time, there is a gap between the side of the middle spray rack 13 and the inner side of the through groove 111 for the spray liquid to flow downward, and there is also a gap between the shielding plate 11 and the tower body 1 for the spray liquid to flow downward; the support spray rack 3 and the middle spray rack 13 are used to maintain the absorption and treatment of hydrogen sulfide in the waste gas in the tower body 1 after the processing chamber is formed; the one-way sealing cylinder 1 5 is composed of a hollow cylinder and a disc. Initially, the one-way sealing drum 15 is supported by the shielding disk 11, and the disc of the one-way sealing drum 15 does not contact the cap-shaped member 5. In this case, the exhaust gas on the lower side of the cap-shaped member 5 can flow to the upper side thereof through the through-hole of the cap-shaped member 5. After the shielding disk 11 forms a processing chamber, the one-way sealing drum 15 loses the support of the shielding disk 11. At this time, the one-way sealing drum 15 moves downward under the action of its own gravity, and the disc of the one-way sealing drum 15 fits with the cap-shaped member 5, so that the upper and lower sides of the cap-shaped member 5 are no longer connected; when the shielding disk 11 moves upward, the limiting groove 141 limits the limiting column 14, driving the middle spray rack 13 to move upward; when the middle spray rack 13 moves upward, the middle spray rack 13 directly contacts the top spray rack 4, but does not contact the spray head 8 on the top spray rack 4, to prevent the spray head 8 from being squeezed and damaged.

[0043] See also Figure 6 and Figure 9, further comprising: a mounting frame 16, fixedly connected to the cap-shaped member 5, the sealing plate 7 is provided with an inclined groove 161, the mounting frame 16 slides in the inclined groove 161, and is used to guide the movement of the sealing plate 7.

[0044] In the above scheme, the purpose is to use the mounting frame 16 to guide the sealing plate 7 so that the sealing plate 7 rotates during the movement, thereby changing the position of the spray head 8 on the lower side of the sealing plate 7, making the flow of the spray liquid more chaotic, and increasing the contact probability between the spray liquid and hydrogen sulfide in the exhaust gas, thereby improving the absorption efficiency of the spray liquid per unit volume of hydrogen sulfide in the exhaust gas, and maintaining the exhaust gas treatment efficiency of the tower body 1.

[0045] See also Figure 1 and Figure 2 , also includes: an air cylinder 17, which is arranged on one side of the tower body 1 near the air inlet 101, and the tower body 1 is provided with an air storage port 104 at the same height as the air inlet 101, the air storage port 104 is communicated with the air cylinder 17, and a piston 18 is sealed and slidably connected in the air cylinder 17. The air cylinder 17 is used to temporarily store excess gas in the tower body 1 to keep the pressure in the tower body 1 stable.

[0046] In the above scheme, the purpose is to use the gas storage cylinder 17 to temporarily store the gas in the tower body 1, maintain the pressure in the tower body 1 stable when the exhaust gas is intermittently treated in the treatment chamber, and maintain the continuity of the exhaust gas treatment; the piston 18 can slide in the gas storage cylinder 17 under the action of its own gravity, and rely on the gravity of the piston 18 to maintain the stability of the pressure in the gas storage cylinder 17 and the tower body 1.

[0047] The working principle of the above scheme is as follows: in the chemical production process, before the exhaust gas containing hydrogen sulfide is generated, the worker starts the liquid circulation system 2 through the control terminal, and the liquid circulation system 2 transports the spray liquid to the liquid storage chamber 701 (due to the relationship between the support spray rack 3 and the top spray rack 4 and the pressure valve at the connection point of the liquid circulation system 2, the spray liquid in the liquid circulation system 2 first flows into the liquid storage chamber 701), so that the liquid level of the spray liquid in the liquid storage chamber 701 gradually rises. When the liquid level of the spray liquid in the liquid storage chamber 701 contacts the blocking float 9, the blocking float 9 moves up together with the liquid level in the liquid storage chamber 701 under the action of buoyancy, and finally the upper side of the blocking float 9 is in contact with the upper side of the cap-shaped member 5. The tower body 1 is connected to the support spray rack 3 and the top spray rack 4, and the spray liquid in the liquid circulation system 2 enters the support spray rack 3 and the top spray rack 4, and is sprayed into the tower body 1 through the spray head 8. At this time, the hydrogen sulfide-containing waste gas generated by the production line enters the tower body 1 through the air inlet 101 and begins to flow upward. At the same time, the spray liquid droplets sprayed by the spray head 8 move downward due to the influence of gravity and the spraying speed, so that the spray liquid contacts the waste gas, and the spray liquid reacts with the hydrogen sulfide in the waste gas to reduce the concentration of hydrogen sulfide in the waste gas.

[0048] As the exhaust gas in the tower body 1 moves upward, the hydrogen sulfide in the exhaust gas continues to react with the spray liquid, causing the concentration of hydrogen sulfide in the exhaust gas to gradually decrease. The exhaust gas moves upward and passes over the branch spray rack 3, the middle spray rack 13 and the top spray rack 4 in turn. Then, the exhaust gas continues to move upward through the through groove 111, passes through the through hole of the cap-shaped member 5 through the one-way sealing tube 15, and is discharged through the exhaust port 102.

[0049] During the absorption and treatment of the exhaust gas, the electrochemical sensor within the air inlet 101 transmits the initial hydrogen sulfide concentration it monitors to the control terminal. Simultaneously, the electrochemical sensor on the underside of the cap-shaped member 5 transmits the final hydrogen sulfide concentration signal it monitors in the exhaust gas to the control terminal. The control terminal then adjusts the liquid delivery power of the liquid circulation system 2 or the flow area of ​​the valves on its upper pipeline in real time to maintain an optimal liquid-to-gas ratio. When the liquid-to-gas ratio becomes unbalanced due to factors such as wear or cavitation of the pump impeller of the liquid circulation system 2, which reduces the spray liquid flow rate, or due to failure of the valve system to open and close and fluctuations in the hydrogen sulfide concentration in the exhaust gas, if the final hydrogen sulfide concentration monitored by the electrochemical sensor is lower than a normal value (the normal value refers to the final hydrogen sulfide concentration when the liquid-to-gas ratio is normal), the control terminal does not operate. If the final hydrogen sulfide concentration monitored by the electrochemical sensor is higher than a normal value, the control terminal determines the required additional spray liquid flow rate based on the initial and final hydrogen sulfide concentrations and activates the treatment push rod 10.

[0050] The telescopic end of the processing push rod 10 contracts and drives the shielding plate 11 to move downward (the shielding plate 11 first loses contact with the one-way sealing cylinder 15, and the one-way sealing cylinder 15 moves downward under the action of its own gravity and blocks the through hole of the cap-shaped member 5), and the shielding plate 11 passes over the top spray rack 4 (in this process, the shielding plate 11 drives the limiting column 14 to move downward, and the limiting column 14 is first squeezed by the top spray rack 4 and contracts into the shielding plate 11 in the process of passing over the top spray rack 4, compressing the spring of the limiting column 14. After the shielding plate 11 passes over the top spray rack 4, the limiting column 14 re-extends out of the shielding plate 11 under the action of its spring) and then continues to move downward, and the shielding plate 11 drives the limiting column 14 to move downward. The distance between the column 14 and the middle spray rack 13 gradually decreases, and then the left and right sides of the middle spray rack 13 contact the through groove 111. At the same time, the limiting column 14 contacts the middle spray rack 13 and is squeezed into the baffle plate 11 by the middle spray rack 13, compressing the spring on the limiting column 14. When the limiting column 14 corresponds to the limiting groove 141, the telescopic end of the processing push rod 10 stops shrinking, and the baffle plate 11 stops moving downward. At the same time, the limiting column 14 extends out of the baffle plate 11 under the action of the spring and enters the limiting groove 141, so that the limiting groove 141 limits the limiting column 14. At this time, the side of the middle spray rack 13 contacts the through groove 111, and the processing chamber is formed.

[0051] During the downward movement of the shielding plate 11, the support spray rack 3, the top spray rack 4 and the middle spray rack 13 continue to spray the spray liquid. At the same time, the exhaust gas gradually enters the unsealed processing chamber through the through slot 111 during the upward movement. After the processing chamber is formed, the control terminal controls the telescopic end of the liquid storage push rod 6 to contract. The telescopic end of the liquid storage push rod 6 drives the sealing plate 7 to move upward, thereby increasing the pressure in the liquid storage chamber 701. As the sealing plate 7 continues to move upward, the spray liquid in the liquid storage chamber 701 is sprayed into the processing chamber through the adjacent spray head 8. At the same time, the spray liquid passes through the spray head on the top spray rack 4. 8 is sprayed into the processing chamber, so that the droplet density of the spray liquid in the processing chamber increases rapidly, and the reaction rate with the hydrogen sulfide in the exhaust gas in the processing chamber is increased, so that the hydrogen sulfide in the exhaust gas is reacted quickly, and the neutralization reaction time in the reaction chamber is adjustable (during normal treatment, the time for the hydrogen sulfide in the exhaust gas to react with the spray liquid is the time required for the exhaust gas to enter from the air inlet 101 and be discharged from the exhaust port 102), and at the same time, the spray liquid in the processing chamber slowly flows out of the processing chamber through the gap between the shielding plate 11 and the tower body 1 and the gap between the through groove 111 and the middle spray rack 13.

[0052] During the upward movement of the sealing plate 7, the mounting frame 16 slides along the inclined groove 161, causing the sealing plate 7 to rotate while moving upward. The sealing plate 7 drives the spray head 8 to rotate, changing the position of the spray liquid sprayed by the spray head 8, thereby making the flow of the spray liquid droplets in the processing chamber more chaotic, and increasing the probability of contact between the spray liquid droplets in the processing chamber and hydrogen sulfide; after the processing chamber is formed, the exhaust gas entering the tower body 1 enters the gas storage cylinder 17 through the gas storage port 104, and pushes the piston 18 to move upward, so that the pressure in the tower body 1 remains stable.

[0053] As the reaction between the spray liquid and hydrogen sulfide in the treatment chamber proceeds, when the electrochemical sensor detects that the final concentration of hydrogen sulfide reaches or is lower than the normal value, the control terminal controls the telescopic ends of the treatment push rod 10 and the liquid storage push rod 6 to extend at the same time. When the telescopic end of the treatment push rod 10 is extended, it drives the shielding plate 11 to move upward, and the shielding plate 11 drives the middle spray rack 13 to move upward through the limiting column 14, so that the volume of the treatment chamber is reduced (at the same time, the space outside the treatment chamber in the tower body 1 increases, the pressure decreases, and the piston 18 squeezes the exhaust gas in the gas storage cylinder 17 into the tower body 1 under the action of its own weight), the pressure in the treatment chamber increases, and the pressure in the treatment chamber eventually overcomes the gravity of the one-way seal 15 and pushes the one-way seal 15 to move upward, so that the one-way seal 15 is released. The through hole on the cap-shaped part 5 is blocked. At this time, the exhaust gas in the treatment chamber passes through the one-way sealing tube 15 and the through hole on the cap-shaped part 5 and enters the exhaust port 102 for discharge. When the middle spray rack 13 contacts the top spray rack 4, the middle spray rack 13 stops moving. As the shielding plate 11 continues to move upward, the shielding plate 11 drives the limiting column 14 to lose contact with the limiting groove 141 and compresses the spring of the limiting column 14. Then the shielding plate 11 loses contact with the middle spray rack 13. At this time, the spring of the limiting column 14 drives the limiting column 14 to extend out of the shielding plate 11 again. The middle spray rack 13 moves down and resets under the action of its own gravity. At this time, the telescopic end of the processing push rod 10 stops extending and begins to contract, so that the exhaust gas in the tower body 1 continues to flow into the treatment chamber.

[0054] As the volume of the processing chamber decreases, the telescopic end of the liquid storage push rod 6 extends and drives the sealing plate 7 to move downward, and the mounting frame 16 slides along the inclined groove 161, causing the sealing plate 7 to rotate in the opposite direction while moving downward, and the pressure in the liquid storage chamber 701 decreases. At the same time, the blocking float 9 releases the blockage of the connection between the liquid circulation system 2 and the liquid storage chamber 701. At this time, the spray liquid in the liquid circulation system 2 stops supplying to the support spray rack 3 and the top spray rack 4, and the spray liquid is injected into the liquid storage chamber 701 until the sealing plate 7 is reset, and the spray liquid in the liquid storage chamber 701 again causes the blocking float 9 to block the connection between the liquid circulation system 2 and the liquid storage chamber 701. New liquid is injected into the branch spray rack 3 and the top spray rack 4, so that in the process of the treatment chamber discharging the treated waste gas, the liquid storage chamber 701 is filled with spray liquid again, and then the telescopic end of the liquid storage push rod 6 is retracted, and the above steps are repeated, so that the waste gas in the tower body 1 is treated in batches by the treatment chamber, which does not affect the normal progress of chemical production. If the liquid-gas ratio is imbalanced due to failure of the valve system to open and close and fluctuation of hydrogen sulfide concentration, then when the hydrogen sulfide concentration in the waste gas returns to normal, the control terminal controls the baffle plate 11 to reset through the treatment push rod 10, and the baffle plate 11 squeezes the one-way sealing cylinder 15 to reset, and continues the initial continuous treatment process.

[0055] When the waste gas is intermittently treated in the treatment chamber, the control terminal controls the moving speed of the telescopic end of the liquid storage push rod 6, and then controls the flow rate of the spray liquid sprayed by the spray head 8 on the sealing plate 7, so that the speed of the intermittent treatment of the waste gas in the treatment chamber matches the speed of the waste gas entering. After the chemical production is completed, the workers stop the liquid circulation system 2 and inspect the liquid circulation system 2 after the waste gas in the tower body 1 is completely treated.

[0056] See also Figure 2 、 Figure 3 and Figure 10 , further comprising: a plurality of annular baffles 19, all of which are fixed between the cap-shaped member 5 and the tower body 1 through a bracket, and the central axes of all the annular baffles 19 are collinear, the gaps between two adjacent annular baffles 19 are equal, and the annular baffles 19 are used to promote the condensation of the spray liquid droplets in the gas; the annular baffle 19 has a plurality of windward sides 191 and a plurality of leeward sides 192 that are staggered on one side close to the central axis thereof, the windward side 191 is provided with a plurality of shielding rings 20, and the same windward side 191 is provided with a plurality of shielding rings 20 near the row The shielding ring 20 on one side of the air port 102 is directly fixed to the adjacent annular baffle 19, and the remaining shielding rings 20 on the same windward side 191 are fixed to the adjacent annular baffles 19 through connecting blocks 21. The shielding ring 20 is used to increase the amount of droplet capture; on the same windward side 191, except for the shielding ring 20 close to the exhaust port 102, there are gaps between the remaining shielding rings 20 and the windward side 191, which are used to make the droplets captured by the shielding ring 20 quickly gather into large particle droplets and drip.

[0057] During the use of the spray tower, in order to prevent the spray liquid in the spray tower from having a negative impact on subsequent processes and equipment, a baffle demister needs to be installed before the exhaust port of the spray tower. The baffle demister separates the droplets from the exhaust gas through physical interception and inertial collision to prevent the droplets from entering the subsequent devices. When using the existing baffle demister, the gap between adjacent baffles in the baffle demister is usually set according to the flow rate of the exhaust gas in the current process, so that the flow rate of the exhaust gas in the flow path formed by the adjacent baffles is the optimal flow rate (when the exhaust gas flows at the optimal flow rate, the demisting efficiency of the baffle demister is the highest. When the flow rate exceeds or is less than the optimal flow rate, the demisting efficiency will decrease). However, in actual use, due to changes in production load, unstable fan speed and other reasons, the exhaust gas flow rate will fluctuate, and the flow rate of the exhaust gas in the flow path will change, causing the flow rate of the exhaust gas in the flow path to deviate from the optimal flow rate, resulting in a decrease in the demisting efficiency of the demister and damage to subsequent equipment.

[0058] In the above scheme, an annular flow channel composed of two adjacent annular baffles 19 is used for the flow of exhaust gas, and the flow areas corresponding to different heights of the annular flow channel are different, so that the flow rate of the exhaust gas at different heights of the annular flow channel is different. In this way, the flow rate of the exhaust gas in the annular flow channel varies within a flow rate range, and the optimal flow rate is included in the flow rate range, so that when the exhaust gas flow fluctuates, the annular baffle 19 maintains a stable capture efficiency of the droplets in the exhaust gas, thereby maintaining the stability of the annular baffle 19's exhaust gas demisting efficiency. Provide protection for subsequent exhaust gas treatment equipment; use the shielding ring 20 to increase the surface area of ​​the annular baffle 19, increase the probability of droplets carried in the exhaust gas contacting the annular baffle 19 and the shielding ring 20, and thus improve the efficiency of capturing droplets in the exhaust gas; use the gap between the annular baffle 19 and the shielding ring 20 to prompt the droplets on the same windward side 191 to quickly gather into large droplets and drip, thereby improving the detachment efficiency of droplets on the surface of the annular baffle 19 and reducing the probability of droplets entrained in the exhaust gas, and maintaining the efficiency of the annular baffle 19 in capturing droplets in the exhaust gas.

[0059] The number of annular baffles 19 can be determined according to the inner diameter of the tower body 1, the minimum outer diameter of the cap-shaped member 5 and the flow rate of the exhaust gas. The number of bends of the annular baffles 19 can be determined according to the amount of droplets in the exhaust gas, which is not further restricted here.

[0060] The working principle of the above scheme is as follows: in the chemical production process, when the tower body 1 is used to treat the waste gas, the treated waste gas will carry droplets of spray liquid. After the waste gas passes through the through hole of the cap-shaped part 5, the waste gas continues to move upward and enters the gap between the two adjacent annular baffles 19. The flow area corresponding to the cross-section of the two adjacent annular baffles 19 at different heights continues to change, so that the waste gas has different flow rates when passing between the two adjacent annular baffles 19. In this way, the flow rate of the waste gas changes back and forth within a certain range during the process of passing through the gap between the two adjacent annular baffles 19, and the optimal flow rate is included. In this way, the capture efficiency of the annular baffle 19 for the droplets in the waste gas tends to be stable, reducing the influence of the capture efficiency on the fluctuation of the waste gas flow rate. At the same time, when the waste gas passes through the gap between the two adjacent annular baffles 19, the droplets in the waste gas collide with the annular baffle 19 and the baffle ring 20, so that the droplets remain on the surface of the annular baffle 19 and the baffle ring 20.

[0061] The captured small droplets on the same windward side 191 have a small weight, which makes it easy for them to be entrained and moved again by the exhaust gas during the flow of the exhaust gas. When the exhaust gas flows along the windward side 191, the exhaust gas will blow the small droplets on the surface of the windward side 191 and the small droplets on the surface of the baffle ring 20 to move upward with it. The small droplets adhered to the surface of the baffle ring 20 continue to move upward through the gap between it and the annular baffle 19. Finally, all small droplets are intercepted at the root of the baffle ring 20 on the uppermost side of the windward side 191. The small droplets gather here to form large droplets. Under the action of their own gravity, the large droplets overcome the upward blowing force of the exhaust gas and move downward and drip. This improves the detachment efficiency of the droplets on the surface of the annular baffle 19 and reduces the probability of droplets entrained by the exhaust gas, thereby maintaining the capture efficiency of the annular baffle 19 for droplets in the exhaust gas.

[0062] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A hydrogen sulfide pretreatment system, comprising: A tower body (1), wherein the tower body (1) is provided with a liquid discharge port (103), an air inlet (101), and an air discharge port (102) in sequence from bottom to top; the tower body (1) is fixedly connected to a liquid circulation system (2) in communication with the liquid discharge port (103); the liquid circulation system (2) is fixedly connected to and in communication with a branch spray rack (3) and a top spray rack (4) located in the tower body (1); A cap-shaped member (5) is fixedly connected to the tower body (1), the cap-shaped member (5) is located above the top spray rack (4), the cap-shaped member (5) is equipped with a liquid storage push rod (6), the cap-shaped member (5) is sealed and slidably connected to a sealing plate (7) rotatably connected to the telescopic end of the liquid storage push rod (6), the sealing plate (7) and the cap-shaped member (5) together form a liquid storage cavity (701) connected to the liquid circulation system (2), the support spray rack (3), the top spray rack (4) and the sealing plate (7) are fixedly connected to the lower side of a plurality of spray heads (8), the support spray rack (3), the top spray rack (4) and the liquid storage cavity (701) are respectively connected to the adjacent spray heads (8), and an electrochemical sensor for monitoring the concentration of hydrogen sulfide therein is installed in the tower body (1); A blocking float (9) is connected to the cap-shaped member (5) in a limited sliding manner. The blocking float (9) is used to monitor the liquid level of the liquid storage chamber (701) and control the connection state between the liquid circulation system (2) and the liquid storage chamber (701). Pressure valves are installed at the connection points between the branch spray rack (3) and the top spray rack (4) and the liquid circulation system (2) to control the flow path of the spray liquid in the liquid circulation system (2); Also includes: A processing push rod (10) is fixedly connected to the tower body (1), the telescopic end of the processing push rod (10) passes through the tower body (1) and is fixedly connected to a shielding plate (11) that is slidably connected to the tower body (1), and the shielding plate (11) is provided with a through slot (111); A connecting pipe (12) is sealingly and slidingly connected to and communicated with the top spray rack (4); the connecting pipe (12) is sealingly and slidingly connected to and communicated with a middle spray rack (13); the middle spray rack (13) is located below the top spray rack (4); the shapes of the middle spray rack (13) and the top spray rack (4) both correspond to the shape of the through slot (111); A limiting column (14) is slidably connected to the blocking plate (11), and a spring is fixedly connected between the two. The middle spray frame (13) is provided with a limiting groove (141), and the limiting groove (141) is used to limit the limiting column (14). The top spray frame (4) and the middle spray frame (13) are both used to squeeze the limiting column (14); The cap-shaped member (5) is provided with a through hole, and a one-way sealing cylinder (15) is slidably connected in the through hole of the cap-shaped member (5). The one-way sealing cylinder (15) is used to control the connection state of the through hole on the cap-shaped member (5), and the blocking plate (11) is used to push the one-way sealing cylinder (15) to move, so as to assist the one-way sealing cylinder (15) in adjusting the connection state of the through hole on the cap-shaped member (5).

2. A hydrogen sulfide pretreatment system according to claim 1, characterized in that: The minimum distance between the top spray rack (4) and the middle spray rack (13) on the central axis of the connecting pipe (12) is smaller than the minimum distance between the spray head (8) on the top spray rack (4) and the middle spray rack (13) on the central axis of the connecting pipe (12).

3. A hydrogen sulfide pretreatment system according to claim 1, characterized in that: include: The mounting frame (16) is fixed to the cap-shaped member (5), and the sealing plate (7) is provided with an inclined groove (161). The mounting frame (16) slides in the inclined groove (161) to guide the movement of the sealing plate (7).

4. A hydrogen sulfide pretreatment system according to claim 1, characterized in that: include: An air storage cylinder (17) is provided on a side of the tower body (1) close to the air inlet (101). The tower body (1) is provided with an air storage port (104) at the same height as the air inlet (101). The air storage port (104) is communicated with the air storage cylinder (17). A piston (18) is sealingly and slidably connected inside the air storage cylinder (17). The air storage cylinder (17) is used to temporarily store excess gas in the tower body (1) to maintain a stable pressure in the tower body (1).

5. A hydrogen sulfide pretreatment system according to claim 4, characterized in that: include: A plurality of annular baffles (19) are fixed between the cap-shaped member (5) and the tower body (1) through brackets, and the central axes of all the annular baffles (19) are collinear, and the gaps between two adjacent annular baffles (19) are equal. The annular baffles (19) are used to promote condensation of spray liquid droplets in the gas.

6. A hydrogen sulfide pretreatment system according to claim 5, characterized in that: The annular baffle (19) has a plurality of windward sides (191) and a plurality of leeward sides (192) that are staggeredly distributed on one side close to the central axis thereof. The windward side (191) is provided with a plurality of shielding rings (20). The shielding ring (20) on the same windward side (191) close to the exhaust port (102) is directly fixed to the adjacent annular baffle (19). The remaining shielding rings (20) on the same windward side (191) are fixed to the adjacent annular baffles (19) with connecting blocks (21). The shielding rings (20) are used to increase the amount of mist droplets captured.

7. A hydrogen sulfide pretreatment system according to claim 6, characterized in that: On the same windward side (191), gaps are present between the remaining blocking rings (20) except the blocking ring (20) on the side close to the exhaust port (102) and the windward side (191), so as to allow the mist droplets captured by the blocking rings (20) to quickly aggregate into large particle droplets and drip.

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