A kind of air pollution control purification tower

Abstract

The present invention relates to the technical field of environmental pollution control, specifically to an air pollution control purification tower, including a tower body, wherein a first partition and a second partition are arranged in the tower body, the first partition and the second partition are parallel to the bottom surface of the purification tower, and the second partition is located above the first partition, a motor is fixedly installed directly between the first partition and the bottom surface of the tower body, an air intake mechanism is fixedly installed at one end of the first rotating shaft and the second rotating shaft away from the first partition and located above the second partition, a purification mechanism is arranged above the second partition and away from the air intake mechanism, an air outlet is opened at the upper end of the tower body, and a filter plate is installed at the end of the air outlet away from the inside of the tower body. The present invention utilizes the process of trachea contraction and recovery of deformation to stir the inside of the reaction liquid. Compared with transmission stirring, this solution will not generate vortexes during stirring, so that all gases have sufficient contact time with the reaction liquid, so that the reaction is complete.

Description

Technical Field

[0001] The invention relates to the technical field of environmental pollution control, in particular to an air pollution control purification tower. Background Art

[0002] Air pollution is a phenomenon in which certain substances enter the atmosphere due to human activities or natural processes, present sufficient concentrations, and last for a sufficient period of time, thus endangering human comfort, health and welfare or the environment. Air pollutants enter the atmosphere from human or natural sources (input), participate in the atmospheric circulation process, and after a certain residence time, are removed from the atmosphere through chemical reactions, biological activities and physical precipitation in the atmosphere (output). If the output rate is less than the input rate, it will accumulate in the atmosphere, causing the concentration of a certain substance in the atmosphere to increase. When the concentration rises to a certain level, it will directly or indirectly cause acute or chronic harm to humans, organisms or materials.

[0003] The utility model patent with patent number CN212188495U discloses a new type of purification tower for air pollution control, including a tower body, an air inlet pipe is fixedly connected to the bottom of the outer wall of the tower body, an exhaust pipe is fixedly connected to the top of the tower body, a liquid storage box is arranged at the bottom of the tower body, the tower body is fixedly installed on the top of the liquid storage box, a through hole is opened on the top of the liquid storage box, the through hole is located inside the tower body, a liquid storage box with a filter plate and a liquid infusion tube is arranged at the bottom of the tower body, the liquid infusion tube is convenient for injecting and exporting the solution, when the water pump is started to recycle the solution inside the liquid storage box during operation, the mixed liquid formed after the sprayed solution and the pollutant react will flow downward through the through hole on the top of the liquid storage box back to the inside of the liquid storage box, the filter plate can filter the mixed liquid, the pollutants in the mixed liquid can be blocked above the filter plate, and the content of impurities in the mixed liquid can be reduced.

[0004] In the existing air pollution control purification tower, the gas and the reaction liquid react with traditional turbine stirring. The smoke and waste gas discharged from the textile factory usually contains many fine fiber threads. During the reaction and stirring process, the fiber threads will be entangled on the rotating shaft of the stirring paddle, affecting the normal operation and service life of the device. At the same time, the turbine stirring is not conducive to the mixing of gas and liquid, which will shorten the reaction time and reduce the purification efficiency. Therefore, an air pollution control purification tower is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an air pollution control purification tower to solve the problem that fiber threads will be entangled on the rotating shaft of the stirring paddle during the reaction stirring process, affecting the normal operation and service life of the device. At the same time, turbine stirring is not conducive to the mixing of gas and liquid, which will shorten the reaction time and reduce the purification efficiency.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A purification tower for air pollution control, comprising a tower body, wherein a first partition and a second partition are arranged in the tower body, the first partition and the second partition are both parallel to the bottom surface of the purification tower, and the second partition is located above the first partition, a motor is fixedly installed between the first partition and the bottom surface of the tower body, a first rotating shaft is arranged at the output end of the motor, the first rotating shaft passes through the first partition and the second partition, and is rotatably connected to the first partition and the second partition through a bearing, a first gear is fixedly installed on the first rotating shaft and located between the first partition and the second partition, a second rotating shaft is arranged on one side of the first rotating shaft, one end of the second rotating shaft passes through the second partition, and the other end is slidably connected to the first partition, an air intake mechanism is fixedly installed at one end of the first rotating shaft and the second rotating shaft away from the first partition and located above the second partition, a purification mechanism is arranged at the part above the second partition and away from the air intake mechanism, an air outlet is opened at the upper end of the tower body, and a filter plate is installed at the end of the air outlet away from the inside of the tower body.

[0008] Preferably, a second gear is fixedly mounted on a side of the second rotating shaft close to the second partition plate, and a cam is fixedly mounted on a side of the second rotating shaft close to the first partition plate.

[0009] Preferably, a first slide groove is provided at the connection between the second rotating shaft and the first partition, a first slider is slidably arranged in the first slide groove, the first slider is connected to one side of the first slide groove by a spring, the slider is rotatably connected to one end of the second rotating shaft, a second slide groove is provided at the connection between the second rotating shaft and the second partition, a second slider is slidably installed in the second slide groove, the second slider is connected to the side wall of the second slide groove by a spring, and the second slider is rotatably connected to the second rotating shaft by a bearing.

[0010] Preferably, the first gear is meshed with the second gear, and the size of the first gear is much smaller than that of the second gear.

[0011] Preferably, the cam comprises a disc, and a protrusion is provided on a side wall of the disc.

[0012] Preferably, the air intake mechanism includes an adjusting mechanism and an air pipe, the adjusting mechanism includes a first connecting rod, a second connecting rod, a claw head and a flexible metal wire, the two ends of the first connecting rod are respectively rotatably connected to the first rotating shaft and the second rotating shaft, one end of the second connecting rod is fixedly connected to the first rotating shaft, and the other end is rotatably connected to the tail of the claw head, a spring is provided between the claw head and the second connecting rod, the claw head and the second rotating shaft are connected by a flexible metal wire, the air pipe is spiral-shaped, one end of the outermost circle of the air pipe is connected to the air inlet, and one end of the innermost circle is provided with a block, and the block is adapted to the claw head.

[0013] Preferably, the first connecting rod is retractable, the air pipe is made of elastic metal, and a side of the air pipe close to the second partition is provided with evenly arranged air holes.

[0014] Preferably, a sensor is installed on the side wall above the second partition and below the purification mechanism, a drain pipe is opened on the side wall below the sensor and close to the upper end of the second partition, and a solenoid valve is provided at the connection between the drain pipe and the side wall of the tower body.

[0015] Preferably, the purification mechanism includes a liquid storage tank, a liquid infusion pipe and an atomizing nozzle, the liquid storage tank is arranged outside the purification tower, the liquid infusion pipe runs through the tower body and is located above the sensor, and the liquid infusion pipe is provided with a plurality of atomizing nozzles at the lower end of the inner part of the tower body.

[0016] Preferably, an activated carbon layer is provided between the purification mechanism and the top of the tower body to absorb the odor of the gas after the reaction.

[0017] Beneficial effects of the present invention:

[0018] 1. The reaction liquid is stirred by utilizing the process of air tube contraction and recovery of deformation, so that the reaction is more complete and the purification efficiency of the purification tower is improved. At the same time, compared with the transmission turbine stirring, this solution does not generate vortex during stirring, so that all gases have sufficient contact time with the reaction liquid, so that the reaction is complete;

[0019] 2. In the process of exhaust gas entering the tower body through the air holes, the position of the air holes changes due to the continuous contraction and recovery of the air pipe, thereby changing the direction of the gas entering the reaction liquid, avoiding the exhaust gas from directly overflowing the reaction liquid from the vertical direction due to the generation of air columns, thereby reducing the purification efficiency. At the same time, when the air pipe contracts and recovers its shape, the inner diameter of the air pipe will also change, thereby changing the gas flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of an air pollution control purification tower of the present invention;

[0022] Figure 2 It is a top view of an air intake mechanism of an air pollution control purification tower of the present invention;

[0023] Figure 3It is a schematic diagram of an air pollution control purification tower of the present invention when the claw head and the block are separated;

[0024] Figure 4 It is a top view of a cam of an air pollution control purification tower of the present invention;

[0025] Figure 5 This is an air pollution control purification tower of the present invention. Figure 1 A partial enlarged view of point A in the middle.

[0026] In the figure: tower body 1, first partition plate 11, second partition plate 12, air outlet 13, filter plate 14, motor 2, first rotating shaft 21, first gear 22, second rotating shaft 23, first slide groove 231, first slider 232, spring 233, second slide groove 234, second slider 235, second gear 24, cam 25, bracket disc 251, protrusion 252, air intake mechanism 3, adjustment mechanism 31, first connecting rod 311, second connecting rod 312, claw head 313, flexible metal wire 314, air pipe 32, air inlet 321, block 322, air hole 323, purification mechanism 4, liquid storage tank 41, infusion tube 42, atomizing nozzle 43, sensor 5, discharge pipe 6, solenoid valve 61, activated carbon layer 7. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. The accompanying drawings are only used for exemplary descriptions, and only represent schematic diagrams rather than physical drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which 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, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Reference Figures 1 to 5 An air pollution control purification tower shown in the figure comprises a tower body 1, wherein a first partition 11 and a second partition 12 are arranged in the tower body 1, wherein the first partition 11 and the second partition 12 are both parallel to the bottom surface of the purification tower, and the second partition 12 is located above the first partition 11, and a motor 2 is fixedly installed between the first partition 11 and the inner bottom surface of the tower body 1, and a first rotating shaft 21 is provided at the output end of the motor 2, wherein the first rotating shaft 21 passes through the first partition 11 and the second partition 12, and is rotatably connected to the first partition 11 and the second partition 12 through a bearing, and a first gear 22 is fixedly installed on the first rotating shaft 21 and located between the first partition 11 and the second partition 12, A second rotating shaft 23 is arranged on one side of the first rotating shaft 21, one end of the second rotating shaft 23 passes through the second partition 12, and the other end is slidably connected to the first partition 11, an air intake mechanism 3 is fixedly installed at one end of the first rotating shaft 21 and the second rotating shaft 23 away from the first partition 11 and above the second partition 12, a purification mechanism 4 is arranged above the second partition 12 and away from the air intake mechanism 3, an air outlet 13 is opened at the upper end of the tower body 1, a filter plate 14 is installed at one end of the air outlet 13 away from the inside of the tower body 1, and the installation of the filter plate 14 can prevent other substances in the chemical plant from falling into the purification tower, thereby producing uncontrollable effects and causing safety hazards.

[0031] Specifically, a second gear 24 is fixedly installed on one side of the second rotating shaft 23 close to the second partition 12, the first gear 22 is meshed with the second gear 24, and the size of the first gear 22 is much smaller than that of the second gear 24. This scheme can achieve a smaller transmission ratio, so that the first gear 22 can drive the second gear 24 to rotate one circle only after rotating multiple circles, and the stroke when the claw head 313 contacts the block 322 can be increased, so that the air pipe 32 is deformed to a greater extent, and at the same time, the flexible metal wire 314 is gradually wound around the second rotating shaft 23 and changes from a relaxed state to a tight state. A cam 25 is fixedly installed on one side of the second rotating shaft 23 close to the first partition 11, and the cam 25 includes a disc 251, and a protrusion 252 is provided on the side wall of the disc 251. The second gear 24 rotates When the second rotating shaft 23 is driven to rotate, the cam 25 is driven to rotate. When the protrusion 252 rotates with the disk 251 to contact the first rotating shaft 21, the distance between the first rotating shaft 21 and the second rotating shaft 23 is increased, so that the second rotating shaft 23 is away from the first rotating shaft 21, so that the second gear 24 is separated from the first gear 22. At this time, the second connecting rod 312 is extended, and the flexible metal wire 314 in a taut state drives the claw head 313 to rotate in the direction away from the block 322, so that the claw head 313 is separated from the block 322, so that the air pipe 32 recovers its deformation. When the protrusion 252 is separated from the first rotating shaft 21, the second rotating shaft 23 and the claw head 313 are restored to their original positions under the action of the spring 233, and at the same time, the flexible metal wire 314 is released from the winding state and returned to the relaxed state.

[0032] By adopting the above technical solution, the air pipe 32 stirs the inside of the reaction liquid when it contracts and recovers its deformation, so that the reaction is more complete and the purification efficiency of the purification tower is improved. At the same time, compared with transmission stirring, this solution will not generate vortexes during stirring, so that all gases have sufficient contact time with the reaction liquid, so that the reaction is complete.

[0033] Specifically, a first slide groove 231 is provided at the connection between the second rotating shaft 23 and the first partition plate 11, a first slider 232 is slidably provided in the first slide groove 231, the slider 232 is connected to one side of the first slide groove 231 by a spring 233, the slider 232 is rotatably connected to one end of the second rotating shaft 23, a second slide groove 234 is provided at the connection between the second rotating shaft 23 and the second partition plate 12, a second slider 235 is slidably installed in the second slide groove 234, the second slider 235 is connected to the side wall of the second slide groove 234 by a spring 233, the second slider 235 is rotatably connected to the second rotating shaft 23 by a bearing, and when the protrusion 2 As the disk 251 rotates to contact the first rotating shaft 21, the distance between the first rotating shaft 21 and the second rotating shaft 23 increases, so that the second rotating shaft 23 moves away from the first rotating shaft 21. At this time, the first slider 232 and the second slider 235 slide in the direction away from the first rotating shaft 21 at the same time, so that the spring 233 is squeezed and deformed. When the protrusion 252 is separated from the first rotating shaft 21, the spring 233 recovers its deformation, pushing the first slider 232 and the second slider 235 to slide in the direction close to the first rotating shaft 21, driving the second rotating shaft 23 to return to its original position, so that the first gear 22 and the second gear 24 are re-engaged.

[0034] Specifically, the air intake mechanism 3 includes an adjustment mechanism 31 and an air pipe 32. The adjustment mechanism 31 includes a first connecting rod 311, a second connecting rod 312, a claw head 313 and a flexible metal wire 314. The two ends of the first connecting rod 311 are respectively rotatably connected to the first rotating shaft 21 and the second rotating shaft 23. One end of the second connecting rod 312 is fixedly connected to the first rotating shaft 21, and the other end is rotatably connected to the tail of the claw head 313. A spring 233 is provided between the claw head 313 and the second connecting rod 312. The claw head 313 is connected to the second rotating shaft 23 through a flexible metal wire. The air pipe 32 is spiral and is wound 1-2 times. Wrapping 1-2 times can make the adjustment mechanism 31 easily drive the air pipe 32 to contract. The air pipe 32 is made of thin-walled spring steel, and the air pipe 32 is provided with evenly arranged air holes 323 on one side close to the second partition plate 12. The starting motor 2 drives the first rotating shaft 21 to rotate, and the first rotating shaft 21 drives the second connecting rod 312 to rotate, thereby driving the claw head 313 to rotate. Through the cooperation of the claw head 313 and the block 322, the air pipe 32 can be driven to contract. The spring 233 is in a compressed state, which supports the claw head 313 and prevents the claw head 313 from detaching from the block 322.

[0035] Specifically, a sensor 5 is installed on the side wall above the second partition 12 and below the purification mechanism 4, and a drain pipe 6 is opened on the side wall below the sensor 5 and close to the upper end of the second partition 12. A solenoid valve 61 is provided at the connection between the drain pipe 6 and the side wall of the tower body 1. When the liquid level inside the tower body 1 exceeds the upper end of the sensor 5, the sensor 5 will send a signal to control the solenoid valve 61 to open for drainage. When the liquid level drops to the lower end of the sensor 5, the solenoid valve 61 is closed, so that the liquid level in the purification tower can be controlled and the purification mechanism 4 will not be submerged.

[0036] Specifically, the purification mechanism 4 includes a liquid storage tank 41, a liquid infusion pipe 42 and an atomizing nozzle 43. The liquid storage tank 41 is arranged outside the purification tower, the liquid infusion pipe 42 passes through the tower body 1 and is located above the sensor 5, and a plurality of atomizing nozzles 43 are provided at the lower end of the liquid infusion pipe 42 at the inner part of the tower body 1. The reaction liquid in the liquid storage tank 41 is sprayed out through the atomizing nozzle 43 and contacts with the reacted gas in the tower body 1 again, so that the harmful elements that have not reacted completely in the gas are completely removed, and the reaction liquid in the tower body 1 is replenished at the same time.

[0037] Specifically, an activated carbon layer 7 is provided between the purification mechanism 4 and the top of the tower body 1 to absorb the odor of the gas after the reaction.

[0038] Working principle: When in use, the exhaust gas enters the air pipe 32 from the air inlet 321, and enters the reaction liquid through the small hole on the side of the air pipe 32 close to the second partition 12. At the same time, the motor 2 is started to drive the first shaft 21 to rotate, and the first shaft 21 drives the second connecting rod 312 to rotate, thereby driving the claw head 313 to rotate. Through the cooperation of the claw head 313 and the block 322, the air pipe 32 can be driven to contract. The first gear 22 is meshed with the second gear 24, and the size of the first gear 22 is much smaller than that of the second gear 24, which can achieve a smaller transmission ratio, so that the first gear 22 can drive the second gear 24 to rotate one circle after rotating multiple circles, which can increase the stroke when the claw head 313 contacts the block 322, so that the air pipe 32 is deformed to a greater extent. A cam 25 is fixedly installed on the side of the second shaft 23 close to the first partition 11. The cam 25 includes a disc 251, and a protrusion 252 is provided on the side wall of the disc 251. When the second gear 24 rotates, it drives the second shaft 23 to rotate, thereby driving the cam 25 to rotate. When the protrusion 252 rotates with the disc 251 to contact the first shaft 21, the second shaft 23 will be separated from the first shaft 21, so that the second gear 24 is separated from the first gear 22. At this time, the claw head 313 is separated from the block 322 under the influence of the flexible metal wire 314, and the air pipe 32 recovers its deformation. In the process of contraction and recovery of the air pipe 32, the inside of the reaction liquid is stirred, so that the reaction is more sufficient, and the purification efficiency of the purification tower is improved. Other substances and water will be generated during the reaction, which will affect the liquid level in the purification tower. When the liquid level inside the tower body 1 exceeds the upper end of the sensor 5, the sensor 5 will send a signal to control the solenoid valve 61 to open for drainage. When the liquid level drops to the lower end of the sensor 5, the solenoid valve 61 is closed, so that the liquid level in the purification tower can be controlled and the purification mechanism 4 will not be immersed.

[0039] It should be noted that the above specific implementations are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art should understand that various modifications, equivalent substitutions, changes, etc. can be made to the present invention. However, as long as these changes do not deviate from the spirit of the present invention, they should be within the scope of protection of the present invention. In addition, some terms used in the specification and claims of this application are not restrictive, but are only for the convenience of description.

Claims

1. An air pollution control purification tower, comprising a tower body (1), characterized in that: A first partition (11) and a second partition (12) are arranged in the tower body (1); the first partition (11) and the second partition (12) are both parallel to the bottom surface of the purification tower, and the second partition (12) is located above the first partition (11); a motor (2) is fixedly installed between the first partition (11) and the bottom surface of the tower body (1); a first rotating shaft (21) is arranged at the output end of the motor (2); the first rotating shaft (21) passes through the first partition (11) and the second partition (12), and is rotatably connected to the first partition (11) and the second partition (12) via a bearing; the first rotating shaft (21) is located on the first partition (11) and the second partition (12) ), a first gear (22) is fixedly installed between the first rotating shaft (21), a second rotating shaft (23) is arranged on one side of the first rotating shaft (21), one end of the second rotating shaft (23) passes through the second partition (12), and the other end is slidably connected to the first partition (11), an air intake mechanism (3) is fixedly installed at one end of the first rotating shaft (21) and the second rotating shaft (23) away from the first partition (11) and located above the second partition (12), a purification mechanism (4) is arranged above the second partition (12) and away from the air intake mechanism (3), an air outlet (13) is opened at the upper end of the tower body (1), and a filter plate (14) is installed at one end of the air outlet (13) away from the inside of the tower body (1); A second gear (24) is fixedly mounted on a side of the second rotating shaft (23) close to the second partition plate (12), and a cam (25) is fixedly mounted on a side of the second rotating shaft (23) close to the first partition plate (11); A first slide groove (231) is provided at the connection between the second rotating shaft (23) and the first partition (11), a first slider (232) is slidably arranged in the first slide groove (231), the first slider (232) is connected to one side of the first slide groove (231) by a spring (233), the slider (232) is rotatably connected to one end of the second rotating shaft (23), a second slide groove (234) is provided at the connection between the second rotating shaft (23) and the second partition (12), a second slider (235) is slidably installed in the second slide groove (234), the second slider (235) is connected to the side wall of the second slide groove (234) by a spring (233), and the second slider (235) is rotatably connected to the second rotating shaft (23) by a bearing; The first gear (22) is meshed with the second gear (24), and the diameter of the first gear (22) is much smaller than the size of the second gear (24); The cam (25) comprises a disc (251), and a protrusion (252) is provided on the side wall of the disc (251); The air intake mechanism (3) comprises an adjusting mechanism (31) and an air pipe (32); the adjusting mechanism (31) comprises a first connecting rod (311), a second connecting rod (312), a claw head (313) and a flexible metal wire (314); the two ends of the first connecting rod (311) are rotatably connected to the first rotating shaft (21) and the second rotating shaft (23) respectively; one end of the second connecting rod (312) is fixedly connected to the first rotating shaft (21), and the other end is fixedly connected to the claw head (313). The tail of the second connecting rod (313) is rotatably connected, a spring (233) is provided between the claw head (313) and the second connecting rod (312), the claw head (313) and the second rotating shaft (23) are connected via a flexible metal wire (314), the air pipe (32) is spiral-shaped, one end of the outermost circle of the air pipe (32) is connected to an air inlet (321), and one end of the innermost circle is provided with a block (322), and the block (322) is adapted to the claw head (313); The first connecting rod (311) is retractable, the air pipe (32) is made of elastic metal material, and a side of the air pipe (32) close to the second partition plate (12) is provided with evenly arranged air holes (323); A sensor (5) is installed on the side wall above the second partition (12) and below the purification mechanism (4); a liquid discharge pipe (6) is provided on the side wall below the sensor (5) and close to the upper end of the second partition (12); and a solenoid valve (61) is provided at the connection between the liquid discharge pipe (6) and the side wall of the tower body (1); The purification mechanism (4) comprises a liquid storage tank (41), a liquid infusion pipe (42) and an atomizing nozzle (43); the liquid storage tank (41) is arranged outside the purification tower; the liquid infusion pipe (42) passes through the tower body (1) and is located above the sensor (5); and a plurality of atomizing nozzles (43) are arranged at the lower end of the liquid infusion pipe (42) inside the tower body (1); An activated carbon layer (7) is provided between the purification mechanism (4) and the top of the tower body (1) to absorb the odor of the gas after the reaction.

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