An ammonia tail gas absorber

Abstract

The application belongs to the technical field of gas purification equipment, and specifically relates to an ammonia tail gas absorption tower, which comprises a tower body, an air inlet pipe is arranged through the upper side wall of the tower body, a baffle is fixedly installed at the upper part and the lower part of the tower body, and an absorption mechanism for absorbing ammonia is arranged in the tower body; the absorption mechanism comprises an absorption assembly and a driving assembly which are installed between the two baffles. In the application, the absorption assembly forms a multistage annular absorption cavity through a fixed cylinder and a movable cylinder which are radially nested, and forms a cyclone flow channel in cooperation with a flow guide groove, an inclined liquid inlet hole and a cyclone groove of a liquid replacement part; under the pushing action of a first pushing cylinder and a second pushing cylinder, the gas-liquid mixture is transferred in a high-speed cyclone state in stages, the gas-liquid contact path is prolonged, the mass transfer effect is strengthened through cyclone disturbance, the ammonia absorption rate is improved, the ammonia is fully absorbed, and the absorption treatment of high-concentration ammonia-containing tail gas is adapted.

Description

Technical Field

[0001] This invention belongs to the technical field of gas purification equipment, specifically an ammonia tail gas absorption tower. Background Technology

[0002] Ammonia is a typical gaseous pollutant emitted by industries such as chemical, fertilizer production, and pharmaceutical manufacturing. It is highly irritating and corrosive and is an air pollutant subject to national emission limits. Direct emissions of ammonia not only cause air pollution but also easily lead to secondary environmental problems such as excessive ammonia nitrogen in water bodies and soil salinization. Therefore, efficient and stable removal of ammonia from ammonia-containing exhaust gases is an important research direction in the field of industrial waste gas treatment.

[0003] A search revealed that patent CN121534517B discloses an ammonia treatment and recovery device, which uses a high-pressure treatment tank with a double-cylinder assembly and a multi-layer movable ring plate structure. The residence time of ammonia in the treatment liquid is extended by adjusting the opening and closing of the ring plate, and a membrane treatment tank is used to complete the pretreatment.

[0004] However, the device uses an immersion bubbling absorption method, and the gas-liquid mass transfer relies on the natural floating of the gas, which has a limited mass transfer rate. It is difficult to guarantee the removal efficiency of large flow rates and high concentrations of ammonia-containing tail gas. The dual-cylinder assembly relies on the misalignment of through holes to achieve flow channel switching. The structure is precise and easily blocked by reaction crystals and impurities during operation, resulting in a high equipment failure rate and high maintenance costs. The device does not have a matching temperature control structure. The exothermic reaction of ammonia dissolution will cause the temperature of the absorbent liquid to rise continuously, reducing the solubility of ammonia and thus weakening the absorption effect. Summary of the Invention

[0005] The purpose of this invention is to provide an ammonia tail gas absorption tower. Under the pushing action of the first pusher and the second pusher, the gas-liquid mixture is transferred step by step in a high-speed swirling state, which not only prolongs the gas-liquid contact path, but also enhances the mass transfer effect through swirling disturbance, improves the ammonia absorption rate, ensures that the ammonia is fully absorbed, and is suitable for the absorption and treatment of high-concentration ammonia-containing tail gas.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ammonia tail gas absorption tower, comprising a tower body, an inlet pipe being provided through the upper side wall of the tower body, baffles being fixedly installed in the upper and lower parts of the tower body, and an absorption mechanism for absorbing ammonia being provided inside the tower body. The absorption mechanism includes an absorption assembly and a drive assembly installed between two partitions; The absorption assembly includes an annular mounting plate, a fixed cylinder, a movable cylinder, a liquid inlet cylinder, and a liquid exchange component. An annular mounting plate is fixedly installed above the lower partition plate inside the tower body. A liquid inlet cylinder and multiple sets of radially nested fixed and movable cylinders are coaxially fixedly installed on the annular mounting plate. The top of the liquid inlet cylinder is fixedly connected to the extension end of the gas inlet pipe, and the bottom of the liquid inlet cylinder is fixedly connected to the inner edge of the annular mounting plate. The fixed and movable cylinders are slidably connected axially. The liquid exchange component is located on the mating wall surface of the movable cylinder, fixed cylinder, and liquid inlet cylinder, and is used to allow the absorption liquid, ammonia, and tail gas to flow between adjacent cylinder cavities. The drive assembly includes a first pusher, a second pusher, an internally threaded sleeve, and a screw. The first pusher is axially slidably installed between the fixed cylinder and the movable cylinder, and the second pusher is axially slidably installed between the fixed cylinder and the liquid inlet cylinder. Internally threaded sleeves are fixedly installed on the inner walls of both the first and second pushers, and the internally threaded sleeves are threadedly engaged with the screw. The top end of the screw passes through the upper partition and extends out. When the screw rotates, it drives the first and second pushers to reciprocate axially through the internally threaded sleeves to promote the flow of absorbent, ammonia, and exhaust gas within the cylinder cavity.

[0007] Preferably, the fluid changing component includes a flow guide groove and a drain outlet. The outer wall of the movable cylinder is provided with multiple flow guide grooves in a ring array, and the inner wall of the flow guide groove is provided with multiple inlet holes in a ring array. The inner wall of the fixed cylinder is provided with multiple swirling grooves in a ring array. The openings of the swirling grooves correspond to and are connected to the openings of the guide grooves. The ends of the swirling grooves penetrate the wall of the fixed cylinder to form a drain outlet.

[0008] Preferably, the drive assembly further includes a locking component and a positioning component; the locking component is disposed at the mating point between the fixed cylinder and the movable cylinder; a gear is fixedly installed at the top end of the screw; A gear ring that meshes with a gear is rotatably mounted on the upper surface of the upper partition plate, and a rotating frame is rotatably mounted above the upper partition plate; a driving component for driving the rotating frame to rotate is mounted on the tower body, and a positioning component is mounted on the rotating frame for circumferential positioning of the gear ring.

[0009] Preferably, the engaging component includes a pressing groove, a spring, a steel ball, and a locking slot; The first pusher and the second pusher have extrusion grooves on their side walls facing the movable cylinder. A spring is fixedly installed at the bottom of the extrusion groove, and a steel ball is fixedly installed at the outer end of the spring. The upper and lower parts of the outer side wall of the movable cylinder are provided with slots for engaging with the steel ball.

[0010] Preferably, the positioning element includes a telescopic rod and a slot; The rotating frame is equipped with multiple telescopic rods facing the upper end face of the toothed ring, and the upper end face of the toothed ring is provided with a slot for inserting and engaging with the output end of the telescopic rod.

[0011] Preferably, the absorption mechanism further includes a drain assembly installed at the bottom of the tower body, an exhaust assembly installed at the top of the tower body, and a cooling assembly installed on the drive assembly; The drain assembly includes a first piston cylinder, a first cylinder, and a drain pipe; the first piston cylinder is installed in the lower cavity of the tower body, and a first cylinder is installed at one end of the first piston cylinder. The output end of the first cylinder extends into the interior of the first piston cylinder and is fixedly connected to the piston; a drain pipe is connected to the cylinder wall at the other end of the first piston cylinder.

[0012] Preferably, the drainage assembly further includes a drainage pipe, an outlet pipe, a liquid detection sensor, and a filling pipe; The inlet end of the liquid inlet pipe is connected to the drain pipe. One end of the drain pipe is connected to the center of the bottom of the lower partition, and the other end passes upward through the lower partition and the annular mounting plate in sequence, and is connected to the annular cavity between the outermost fixed cylinder and the tower body. A liquid outlet pipe is connected to the center of the end of the first piston cylinder away from the first cylinder. The outer end of the liquid outlet pipe extends through the side wall of the tower body for connecting to an external liquid collection device. A liquid detection sensor is also installed at the end of the first piston cylinder away from the first cylinder. A liquid filling pipe is installed at the bottom of the lower partition, and the outer end of the liquid filling pipe extends out of the side wall of the tower body for connection to external liquid conveying equipment; The inlet pipe, outlet pipe, and filling pipe are all equipped with solenoid valves for controlling the liquid flow and shut-off.

[0013] Preferably, the exhaust assembly includes a second piston cylinder, a second cylinder, and a delivery pipe; The second piston cylinder is installed in the upper cavity of the tower body. A second cylinder is installed at the center of one end of the second piston cylinder. The output end of the second cylinder extends into the interior of the second piston cylinder and is fixedly connected to the piston. The other end of the second piston cylinder is connected to a conveying pipe, the lower end of which is connected to the upper surface of the upper partition and communicates with the absorption cavity below the partition.

[0014] Preferably, the exhaust assembly further includes a return pipe, an exhaust pipe, and a gas detection sensor; The delivery pipe and the air inlet pipe are connected by a return pipe; the end of the second piston cylinder away from the second cylinder is connected to an exhaust pipe, and the outer end of the exhaust pipe extends out of the side wall of the tower body for external exhaust treatment equipment. A gas detection sensor is also installed at the end of the second piston cylinder away from the second cylinder; solenoid valves for controlling the gas flow and shut-off are installed on the delivery pipe, return pipe and exhaust pipe.

[0015] Preferably, the cooling component includes a hose and a cooling chamber; multiple hoses are installed on the lower surface of the upper partition, and the other end of the hoses is connected to the upper end of the fixed cylinder; the interior of the fixed cylinder is provided with a cooling chamber that communicates with the hoses, and the top of the cooling chamber 452 is provided with an exhaust hole that communicates with the absorption chamber, so that the cooling medium can be discharged through the exhaust hole after heat exchange is completed.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The absorption assembly of the present invention forms a multi-stage annular absorption cavity through radially nested fixed cylinders and movable cylinders, which, together with the guide groove, oblique liquid inlet hole and swirling groove of the liquid exchange component, form a swirling flow channel; under the pushing action of the first pusher and the second pusher, the gas-liquid mixture is transferred step by step in a high-speed swirling state, which not only prolongs the gas-liquid contact path, but also enhances the mass transfer effect through swirling disturbance, improves the absorption rate of ammonia, ensures that ammonia is fully absorbed, and is suitable for the absorption and treatment of high-concentration ammonia-containing tail gas. 2. The present invention is equipped with a drive component and a locking component, so that when the first push cylinder and the second push cylinder reciprocate, the moving cylinder can be moved up and down synchronously through the locking and engagement of the steel ball and the slot, so as to complete the flow channel switching, without the need for an additional independent adjustment drive mechanism; with the insertion and time-division control of the positioning component, independent control of multiple push cylinders by a single drive source can be realized, simplifying the overall transmission structure and reducing the manufacturing cost and failure rate of the equipment. 3. The present invention is equipped with a drainage component, which adopts a piston-type drainage structure with a first piston cylinder and a solenoid valve. The drainage pipe draws out the absorbent liquid in the outer annular cavity, and the saturation is detected by a liquid detection sensor. Only the absorbent liquid that has reached the saturation threshold is discharged quantitatively. At the same time, an equal amount of fresh absorbent liquid is added through the liquid addition pipe. This not only avoids the ineffective waste of absorbent liquid and improves the utilization rate, but also maintains a stable liquid level in the absorption cavity, ensuring the continuous and stable operation of the ammonia absorption process. 4. This invention is equipped with an exhaust assembly, which adopts a piston-type air extraction structure with a second piston cylinder. The exhaust gas from the top of the absorption chamber is extracted through the delivery pipe, and the residual concentration of ammonia is detected in real time by a gas detection sensor. The exhaust gas that meets the standards is directly discharged through the exhaust pipe, while the exhaust gas that exceeds the standards is returned to the intake pipe for secondary absorption through the return pipe, forming a closed-loop control mechanism. This ensures that the exhaust gas is stably discharged in compliance with standards, reduces ineffective circulation energy consumption, lowers operating costs, and improves the environmental friendliness of the equipment. 5. This invention is equipped with a cooling component. A low-temperature cooling medium is introduced into the cooling chamber inside the fixed cylinder through a hose. When the cooling medium flows along the cylinder wall, it exchanges heat with the absorbent liquid, which promptly removes the heat of reaction released by the dissolution of ammonia, maintains a suitable working temperature of the absorbent liquid, and avoids the ammonia solubility from decreasing due to temperature rise. The cooling medium after heat exchange can be directly discharged into the absorption chamber with the exhaust gas without the need for an additional recovery pipeline. The structure is simple and the temperature control effect is stable, ensuring long-term stable absorption efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional structural diagram of the present invention; Figure 3 This is a frontal cross-sectional structural diagram of the present invention; Figure 4 This is the present invention. Figure 3 Enlarged structural diagram at point A; Figure 5 This is the present invention. Figure 3 A magnified structural diagram of point B; Figure 6 This is a three-dimensional exploded structural diagram of the absorption component of the present invention; Figure 7 This is a three-dimensional exploded structure diagram of the driving component of the present invention from one perspective; Figure 8 This is a two-dimensional exploded view of the driving component of the present invention.

[0018] In the diagram: 100, Tower body; 200, Inlet pipe; 300, Baffle plate; 400, Absorption mechanism; 410, Absorption assembly; 411, Annular mounting plate; 412, Fixed cylinder; 413, Movable cylinder; 414, Liquid inlet cylinder; 415, Liquid changing component; 4151, Guide channel; 4152, Liquid inlet hole; 4153, Swirl channel; 4154, Discharge port; 420, Drive assembly; 421, First pusher cylinder; 422, Second pusher cylinder; 423, Clamping component; 4231, Extrusion groove; 4232, Spring; 4233, Steel ball; 4234, Slot; 424, Internal threaded sleeve; 425, Screw. 426. Gear; 427. Gear ring; 428. Rotating frame; 429. Positioning component; 4291. Telescopic rod; 4292. Slot; 430. Drainage assembly; 431. First piston cylinder; 432. First cylinder; 433. Inlet pipe; 434. Drainage pipe; 435. Outlet pipe; 436. Liquid detection sensor; 437. Filling pipe; 440. Exhaust assembly; 441. Second piston cylinder; 442. Second cylinder; 443. Delivery pipe; 444. Return pipe; 445. Exhaust pipe; 446. Gas detection sensor; 450. Cooling assembly; 451. Hose; 452. Cooling chamber. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] like Figures 1-3 , Figure 7 and Figure 8 As shown, an ammonia tail gas absorption tower includes a tower body 100. An inlet pipe 200 is provided through the upper side wall of the tower body 100. Baffles 300 are fixedly installed in the upper and lower parts of the tower body 100. An absorption mechanism 400 for absorbing ammonia is provided inside the tower body 100. The absorption mechanism 400 includes an absorption component 410 and a drive component 420 installed between the two baffles 300. The absorption mechanism 400 also includes a liquid discharge component 430 installed in the lower part of the tower body 100, an exhaust component 440 installed in the upper part of the tower body 100, and a cooling component 450 installed on the drive component 420. Ammonia-containing exhaust gas is introduced into the tower body 100 through the inlet pipe 200. Two partitions 300 divide the interior of the tower body 100 into three independent areas from top to bottom: an exhaust chamber, an absorption chamber, and a drain chamber. The absorption assembly 410 and the drive assembly 420 are both located in the middle absorption chamber. Ammonia absorption and enrichment are achieved through multi-stage counter-current contact between the absorbent liquid and the ammonia-containing exhaust gas. The treated purified exhaust gas rises into the upper exhaust chamber, and is discharged after passing inspection. The saturated absorbent liquid flows into the lower drain chamber for centralized discharge and replacement, achieving orderly separation of the gas and liquid phases and ensuring continuous and stable operation of the absorption process.

[0021] like Figures 1-8As shown, the absorption assembly 410 includes an annular mounting plate 411, a fixed cylinder 412, a movable cylinder 413, a liquid inlet cylinder 414, and a liquid exchange component 415. An annular mounting plate 411 is fixedly installed above the lower partition 300 inside the tower body 100. A liquid inlet cylinder 414 and multiple sets of radially nested fixed cylinders 412 and movable cylinders 413 are coaxially fixedly installed on the annular mounting plate 411. The top of the liquid inlet cylinder 414 is fixedly connected to the extension end of the air inlet pipe 200, and the bottom of the liquid inlet cylinder 414 is fixedly connected to the annular mounting plate 411. The inner edge of the mounting plate 411 is fixedly connected; the fixed cylinder 412 and the movable cylinder 413 are slidably connected along the axial direction; the liquid changing component 415 is set on the mating wall surface of the movable cylinder 413, the fixed cylinder 412 and the liquid inlet cylinder 414, for the absorption liquid, ammonia and tail gas to flow between adjacent cylinder cavities. The effective liquid pushing volume of the liquid inlet cylinder 414 is consistent with the effective liquid pushing volume of the annular cavity between each group of movable cylinders 413 and fixed cylinders 412. With the equal stroke reciprocating motion of the push cylinder, the liquid inlet and outlet volume of each stage of the chamber is matched. During operation, absorbent is first added to the inlet cylinder 414 and the cavity between the inlet cylinder 414 and the adjacent inner layer movable cylinder 413. At the same time, the air inlet pipe 200 delivers ammonia-containing tail gas to the inside of the inlet cylinder 414. When the absorbent is pushed from the inlet cylinder 414 to the inner cavity of the adjacent movable cylinder 413, the gas-liquid mixing is enhanced by the liquid exchange component 415, thereby improving the absorption efficiency of ammonia. When the second pusher cylinder 422 moves downward, it first drives the inner layer movable cylinder 413 to slide downward along the inner side of the corresponding fixed cylinder 412. When the lower end face of the movable cylinder 413 abuts against the upper surface of the annular mounting plate 411, the guide groove 4151 and the swirl groove 4153 are aligned and form a complete flow channel. The second pusher cylinder 422 continues to move downward, pushing the gas-liquid mixture in the cavity to the adjacent outer annular cavity through the liquid exchange component 415. After the push is completed, the second pusher 422 moves upward, driving the movable cylinder 413 to move upward synchronously, causing the guide channel 4151 and the swirl channel 4153 to be axially misaligned and the flow channel to be disconnected, thus preventing the pushed absorbent liquid from flowing back. Then, through the reciprocating push and pull of the first pusher 421, the gas-liquid mixture is pushed step by step into the annular cavity between the outermost fixed cylinder 412 and the tower body 100. The absorbent liquid and the ammonia-containing tail gas undergo multiple step-by-step exchange and swirl disturbances, and the absorbent liquid fully adsorbs the ammonia gas. The exhaust gas rises through the upper opening of the chamber to the top of the absorption chamber and finally enters the exhaust assembly 440 for testing. Qualified exhaust gas is discharged, while unqualified exhaust gas is transported to the inlet pipe 200 for further treatment. The ammonia-containing absorbent liquid enters the drain assembly 430 for testing. If the concentration of the absorbent liquid is qualified, it is discharged outside the tower body 100, and new absorbent liquid needs to be injected into the inlet cylinder 414. Unqualified absorbent liquid is discharged again into the chamber between the lower baffle 300 and the annular mounting plate 411.

[0022] like Figures 3-6As shown, the fluid changing component 415 includes a flow guide groove 4151 and a drain port 4154. The outer wall of the movable cylinder 413 is provided with multiple flow guide grooves 4151 in a ring array. The inner wall of the flow guide grooves 4151 is provided with multiple inlet holes 4152 in a ring array. The inner wall of the fixed cylinder 412 is provided with multiple swirling grooves 4153 in a ring array. The opening of the swirling grooves 4153 corresponds to the opening of the flow guide grooves 4151 and is interconnected. The end of the swirling grooves 4153 penetrates the cylinder wall of the fixed cylinder 412 to form a drain port 4154. When the movable cylinder 413 slides downward, it drives the guide groove 4151 to dock with the swirling groove 4153. After the guide groove 4151 docks with the swirling groove 4153, the first pusher 421 or the second pusher 422 will squeeze the gas and liquid in the inner cavity of the movable cylinder 413 into the guide groove 4151 through the liquid inlet 4152. Since the liquid inlet 4152 is obliquely cut into the inner side of the guide groove 4151, the gas and liquid will undergo high-speed spiral flow when entering the guide groove 4151 and the swirling groove 4153. Finally, it enters the outer chamber at high speed through the liquid outlet 4154. The obliquely opened liquid inlet 4152 and the spirally extended swirling groove 4153 can make the absorbent liquid and the tail gas form swirling disturbances during the flow process, enhance the mass transfer effect of the gas and liquid phases, improve the absorption rate of ammonia, and ensure that ammonia is fully absorbed.

[0023] like Figures 1-8 As shown, the drive assembly 420 includes a first pusher 421, a second pusher 422, an internally threaded sleeve 424, and a screw 425. The first pusher 421 is axially slidably installed between the fixed cylinder 412 and the movable cylinder 413, and the second pusher 422 is axially slidably installed between the fixed cylinder 412 and the liquid inlet cylinder 414. The internally threaded sleeve 424 is fixedly installed on the inner wall of both the first pusher 421 and the second pusher 422, and the internally threaded sleeve 424 is threadedly engaged with the screw 425. The top end of the screw 425 passes through the upper partition 300 and extends out. When the screw 425 rotates, it drives the first pusher 421 and the second pusher 422 to reciprocate axially through the internally threaded sleeve 424, so as to push the absorbent, ammonia and tail gas to flow in the cylinder cavity. The drive assembly 420 also includes a locking member 423 and a positioning member 429; the locking member 423 is disposed at the mating point between the fixed cylinder 412 and the movable cylinder 413; a gear 426 is fixedly installed at the top end of the screw 425; a gear ring 427 that meshes with the gear 426 is rotatably installed on the upper surface of the upper partition 300, and a rotating frame 428 is rotatably installed above the upper partition 300; a drive member (a geared motor is used in this embodiment) for driving the rotating frame 428 to rotate is installed on the tower body 100, and the positioning member 429 is installed on the rotating frame 428 for circumferential positioning of the gear ring 427; When the drive unit drives the rotating frame 428 to rotate, the toothed ring 427 at the corresponding position can be driven to rotate synchronously through the insertion and engagement of the positioning member 429. The toothed ring 427 drives the corresponding screw 425 to rotate through meshing transmission. The screw 425 and the internal threaded sleeve 424 are threaded together to convert the rotational motion into linear motion, thereby driving the corresponding first pusher 421 or second pusher 422 to move back and forth along the axial direction. During the up and down movement of the first pusher 421 and the second pusher 422, they can exert a pushing force on the absorbent liquid and mixed gas in the corresponding chamber, forcing the gas and liquid two-phase rapid flow to complete mass transfer exchange through the liquid exchange member 415. Compared with the natural convection absorption method, this can improve the mass transfer rate and processing efficiency.

[0024] like Figures 3-7 As shown, the engaging component 423 includes a pressing groove 4231, a spring 4232, a steel ball 4233, and a locking groove 4234; the first push cylinder 421 and the second push cylinder 422 have pressing grooves 4231 on their side walls facing the movable cylinder 413, the bottom of the pressing groove 4231 is fixedly installed with a spring 4232, and the outer end of the spring 4232 is fixedly installed with a steel ball 4233; the upper and lower parts of the outer side wall of the movable cylinder 413 are both provided with locking grooves 4234 that engage with the steel ball 4233. When the first pusher 421 or the second pusher 422 moves downward axially, the steel ball 4233 engages with the upper slot 4234, causing the movable cylinder 413 to move downward synchronously. When the lower end face of the movable cylinder 413 moves to the upper surface of the annular mounting plate 411, the movable cylinder 413 is stopped from moving downward. The first pusher 421 or the second pusher 422 continues to move downward, causing the steel ball 4233 to be squeezed by the side wall of the slot 4234, compressing the spring 4232 and retracting it into the squeezing groove 4231. The corresponding pusher disengages from the movable cylinder 413 and continues to move downward to push the liquid. When the first pusher 421 or the second pusher 422 reaches the lower stop point, the steel ball 4233 moves to the lower slot. Position 4234 pops out under the elastic force of spring 4232 and engages with the lower slot 4234; when the pusher moves upward, it can drive the movable cylinder 413 to move upward synchronously through the engagement, completing the disconnection and reset of the flow channel. The reciprocating motion of the first pusher 421 and the second pusher 422 can realize the extrusion and conveying of gas and liquid, and can also drive the movable cylinder 413 to move up and down through the engagement of the engaging part 423, completing the switching of the flow guide channel 4151 and the vortex channel 4153. There is no need to set up an additional independent adjustment drive mechanism. The flow channel opening and closing and liquid pushing operation can be completed synchronously through the stroke of the pusher itself, simplifying the overall transmission structure and reducing the equipment manufacturing cost and failure rate.

[0025] like Figure 7As shown, the positioning component 429 includes a telescopic rod 4291 and a slot 4292; a plurality of telescopic rods 4291 are mounted on the upper end face of the rotating frame 428 facing the toothed ring 427, and a slot 4292 is provided on the upper end face of the toothed ring 427 to engage with the output end of the telescopic rod 4291. When it is necessary to drive the screw 425 of the corresponding annular cavity to rotate, the telescopic rod 4291 at the corresponding position is activated to extend it. Its output end is inserted into the slot 4292 on the surface of the toothed ring 427, so that the rotating frame 428 and the toothed ring 427 form a circumferential transmission connection. The rotation of the rotating frame 428 can drive the toothed ring 427 and the corresponding screw 425 to rotate synchronously. The telescopic rod 4291 corresponding to the screw 425 that does not need to be driven remains in the retracted state, and the corresponding toothed ring 427 does not rotate with the rotating frame 428, thereby realizing the time-sharing independent control of multi-stage push cylinders by a single drive source.

[0026] like Figures 1-4 and Figure 6 As shown, the drain assembly 430 includes a first piston cylinder 431, a first cylinder 432, and an inlet pipe 433. The first piston cylinder 431 is installed in the lower cavity of the tower body 100. The first cylinder 432 is installed at one end of the first piston cylinder 431, and the output end of the first cylinder 432 extends into the first piston cylinder 431 and is fixedly connected to the piston. The inlet pipe 433 is connected to the cylinder wall at the other end of the first piston cylinder 431. The drain assembly 430 also includes a drain pipe 434, an outlet pipe 435, a liquid detection sensor 436, and a filling pipe 437. The inlet end of the inlet pipe 433 is connected to the drain pipe 434. One end of the drain pipe 434 is connected to the center of the bottom of the lower partition 300, and the other end passes upward through the lower partition. Plate 300 and annular mounting plate 411 are connected to the annular cavity between the outermost fixed cylinder 412 and the tower body 100; a liquid outlet pipe 435 is connected to the center of the end of the first piston cylinder 431 away from the first cylinder 432, and the outer end of the liquid outlet pipe 435 extends through the side wall of the tower body 100 for connecting to external liquid collection equipment; a liquid detection sensor 436 is also installed at the end of the first piston cylinder 431 away from the first cylinder 432; a liquid inlet pipe 437 is installed at the bottom of the lower partition plate 300, and the outer end of the liquid inlet pipe 437 extends through the side wall of the tower body 100 for connecting to external liquid conveying equipment; solenoid valves for controlling the liquid flow and shut-off are provided on the liquid inlet pipe 433, the liquid outlet pipe 434, the liquid outlet pipe 435 and the liquid inlet pipe 437. When the absorbent enters the chamber between the outermost fixed cylinder 412 and the tower body 100, the first cylinder 432 drives the piston in the first piston cylinder 431 to move. In conjunction with the switching of the solenoid valves in each pipeline, the absorbent entering the annular chamber between the fixed cylinder 412 and the tower body 100 is drawn into the first piston cylinder 431 through the cooperation of the inlet pipe 433 and the outlet pipe 434. The liquid detection sensor 436 detects the ammonia concentration and saturation of the absorbent. After confirming that the discharge threshold has been reached, the first cylinder 432 operates, discharging the absorbent inside the first piston cylinder 431 through the outlet pipe 435 to an external collection device for subsequent analysis. After the liquid is discharged, the fresh absorbent connected to the liquid addition pipe 437 can be added to the absorption chamber to maintain a stable absorbent liquid level. When the absorbent liquid does not reach the discharge threshold, the first cylinder 432 drives the piston in the first piston cylinder 431 to move. In conjunction with the switching of the solenoid valves in each pipeline, the absorbent liquid inside the first piston cylinder 431 is pushed back into the absorption chamber through the cooperation of the liquid inlet pipe 433 and the liquid outlet pipe 434 to continue absorption. The piston-type liquid discharge structure can control the flow rate of liquid discharge and liquid addition, avoid the absorption effect caused by the fluctuation of the absorbent liquid level. At the same time, it can realize the quantitative discharge of saturated absorbent liquid and the replenishment of fresh absorbent liquid, ensuring the continuous and stable operation of the absorption process.

[0027] like Figures 1-3 , Figure 7 and Figure 8 As shown, the exhaust assembly 440 includes a second piston cylinder 441, a second cylinder 442, and a delivery pipe 443. The second piston cylinder 441 is installed in the upper cavity of the tower body 100. The second cylinder 442 is installed at the center of one end of the second piston cylinder 441, and the output end of the second cylinder 442 extends into the interior of the second piston cylinder 441 and is fixedly connected to the piston. The other end of the second piston cylinder 441 is connected to the delivery pipe 443, and the lower end of the delivery pipe 443 is connected to the upper surface of the upper partition 300 and communicates with the absorption chamber below the upper partition 300. The exhaust assembly 440 also includes... The system includes a return pipe 444, an exhaust pipe 445, and a gas detection sensor 446. The delivery pipe 443 is connected to the inlet pipe 200 via the return pipe 444. The end of the second piston cylinder 441 furthest from the second cylinder 442 is connected to the exhaust pipe 445, the outer end of which protrudes from the side wall of the tower body 100 for connection to external exhaust treatment equipment. A gas detection sensor 446 is also installed at the end of the second piston cylinder 441 furthest from the second cylinder 442. Solenoid valves for controlling gas flow and on / off are installed on the delivery pipe 443, the return pipe 444, and the exhaust pipe 445. After multi-stage absorption, the exhaust gas rises to the top of the absorption chamber. The second cylinder 442 drives the piston in the second piston cylinder 441 to move, and the treated exhaust gas is drawn into the second piston cylinder 441 through the delivery pipe 443. The gas detection sensor 446 detects the residual concentration of ammonia in the exhaust gas in real time. When the concentration meets the emission standards, the solenoid valve of the exhaust pipe 445 opens, the second cylinder 442 works, and the qualified exhaust gas in the second piston cylinder 441 is discharged from the tower body 100 through the exhaust pipe 445. When the ammonia concentration exceeds the standard, the solenoid valve of the return pipe 444 opens, and the exhaust gas flows back to the front end of the inlet pipe 200 through the return pipe 444. After mixing with the newly entered ammonia-containing exhaust gas, it re-enters the absorption chamber for secondary absorption to ensure that the exhaust gas emission is stable and meets the standards. The piston-type extraction structure can control the extraction rate of the exhaust gas. Combined with the closed-loop detection of gas concentration, it realizes the control of exhaust gas emission, avoids excessive emission, and reduces ineffective cycle energy consumption.

[0028] like Figure 2 , Figure 4 , Figure 7 and Figure 8 As shown, the cooling component 450 includes a flexible hose 451 and a cooling chamber 452; multiple flexible hoses 451 are installed on the lower surface of the upper partition 300, and the other end of the flexible hose 451 is connected to the upper end of the fixed cylinder 412; the fixed cylinder 412 has a cooling chamber 452 that communicates with the flexible hose 451 inside, and the top of the cooling chamber 452 is provided with an exhaust hole that communicates with the absorption chamber. After the cooling medium completes the heat exchange, it can be discharged through the exhaust hole. The dissolution of ammonia in the absorbent is an exothermic reaction. Continuous absorption leads to an increase in the absorbent temperature, reducing the solubility and absorption efficiency of ammonia. An external gas supply device delivers low-temperature cooling gas through a pipe at the top of the tower 100 to a flexible hose 451, which then flows into a cooling chamber 452 inside the fixed cylinder 412. As the low-temperature gas flows downwards within the cooling chamber 452, it exchanges heat with the absorbent through the cylinder wall, carrying away the heat generated during absorption. The gas, after heat exchange, is discharged from the exhaust port at the top of the cooling chamber 452 into the absorption chamber, and finally enters the exhaust assembly 440 for treatment along with the tail gas. The cooling assembly 450 maintains a suitable operating temperature for the absorbent, preventing a decrease in absorption efficiency due to temperature increases and ensuring stable ammonia absorption efficiency.

[0029] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ammonia tail gas absorption tower, comprising a tower body, wherein an inlet pipe is provided through the upper side wall of the tower body, characterized in that, The upper and lower parts of the tower body are fixedly installed with baffles, and the tower body is equipped with an absorption mechanism for absorbing ammonia. The absorption mechanism includes an absorption assembly and a drive assembly installed between two partitions; The absorption assembly includes an annular mounting plate, a fixed cylinder, a movable cylinder, a liquid inlet cylinder, and a liquid exchange component. An annular mounting plate is fixedly installed above the lower partition plate inside the tower body. A liquid inlet cylinder and multiple sets of radially nested fixed and movable cylinders are coaxially fixedly installed on the annular mounting plate. The top of the liquid inlet cylinder is fixedly connected to the extension end of the gas inlet pipe, and the bottom of the liquid inlet cylinder is fixedly connected to the inner edge of the annular mounting plate. The fixed and movable cylinders are slidably connected axially. The liquid exchange component is located on the mating wall surface of the movable cylinder, fixed cylinder, and liquid inlet cylinder, and is used to allow the absorption liquid, ammonia, and tail gas to flow between adjacent cylinder cavities. The drive assembly includes a first pusher, a second pusher, an internally threaded sleeve, and a screw. The first pusher is axially slidably installed between the fixed cylinder and the movable cylinder, and the second pusher is axially slidably installed between the fixed cylinder and the liquid inlet cylinder. Internally threaded sleeves are fixedly installed on the inner walls of both the first and second pushers, and the internally threaded sleeves are threadedly engaged with the screw. The top end of the screw passes through the upper partition and extends out. When the screw rotates, it drives the first and second pushers to reciprocate axially through the internally threaded sleeves to promote the flow of absorbent, ammonia, and exhaust gas within the cylinder cavity.

2. The ammonia tail gas absorption tower according to claim 1, characterized in that, The fluid exchange component includes a flow guide groove and a drain outlet. The outer wall of the movable cylinder has multiple flow guide grooves arranged in a ring array, and the inner wall of the flow guide groove has multiple inlet holes arranged in a ring array at an angle. The inner wall of the fixed cylinder is provided with multiple swirling grooves in a ring array. The openings of the swirling grooves correspond to and are connected to the openings of the guide grooves. The ends of the swirling grooves penetrate the wall of the fixed cylinder to form a drain outlet.

3. The ammonia tail gas absorption tower according to claim 1, characterized in that, The drive assembly also includes a locking component and a positioning component; the locking component is disposed at the mating point between the fixed cylinder and the movable cylinder; a gear is fixedly installed at the top end of the screw; A gear ring that meshes with a gear is rotatably mounted on the upper surface of the upper partition plate, and a rotating frame is rotatably mounted above the upper partition plate; a driving component for driving the rotating frame to rotate is mounted on the tower body, and a positioning component is mounted on the rotating frame for circumferential positioning of the gear ring.

4. An ammonia tail gas absorption tower according to claim 3, characterized in that, The engaging component includes a pressing groove, a spring, a steel ball, and a locking slot; The first pusher and the second pusher have extrusion grooves on their side walls facing the movable cylinder. A spring is fixedly installed at the bottom of the extrusion groove, and a steel ball is fixedly installed at the outer end of the spring. The upper and lower parts of the outer side wall of the movable cylinder are provided with slots for engaging with the steel ball.

5. An ammonia tail gas absorption tower according to claim 3, characterized in that, The positioning element includes a telescopic rod and a slot; The rotating frame is equipped with multiple telescopic rods facing the upper end face of the toothed ring, and the upper end face of the toothed ring is provided with a slot for inserting and engaging with the output end of the telescopic rod.

6. The ammonia tail gas absorption tower according to claim 1, characterized in that, The absorption mechanism also includes a liquid discharge assembly installed at the bottom of the tower body, an exhaust assembly installed at the top of the tower body, and a cooling assembly installed on the drive assembly; The drain assembly includes a first piston cylinder, a first cylinder, and a drain pipe; the first piston cylinder is installed in the lower cavity of the tower body, and a first cylinder is installed at one end of the first piston cylinder. The output end of the first cylinder extends into the interior of the first piston cylinder and is fixedly connected to the piston; a drain pipe is connected to the cylinder wall at the other end of the first piston cylinder.

7. An ammonia tail gas absorption tower according to claim 6, characterized in that, The drainage assembly also includes a drainage pipe, an outlet pipe, a liquid detection sensor, and a filling pipe; The inlet end of the liquid inlet pipe is connected to the drain pipe. One end of the drain pipe is connected to the center of the bottom of the lower partition, and the other end passes upward through the lower partition and the annular mounting plate in sequence, and is connected to the annular cavity between the outermost fixed cylinder and the tower body. A liquid outlet pipe is connected to the center of the end of the first piston cylinder away from the first cylinder. The outer end of the liquid outlet pipe extends through the side wall of the tower body for connecting to an external liquid collection device. A liquid detection sensor is also installed at the end of the first piston cylinder away from the first cylinder. A liquid filling pipe is installed at the bottom of the lower partition, and the outer end of the liquid filling pipe extends out of the side wall of the tower body for connection to external liquid conveying equipment; The inlet pipe, outlet pipe, and filling pipe are all equipped with solenoid valves for controlling the liquid flow and shut-off.

8. An ammonia tail gas absorption tower according to claim 6, characterized in that, The exhaust assembly includes a second piston cylinder, a second cylinder, and a delivery pipe; The second piston cylinder is installed in the upper cavity of the tower body. A second cylinder is installed at the center of one end of the second piston cylinder. The output end of the second cylinder extends into the interior of the second piston cylinder and is fixedly connected to the piston. The other end of the second piston cylinder is connected to a conveying pipe, the lower end of which is connected to the upper surface of the upper partition and communicates with the absorption cavity below the partition.

9. An ammonia tail gas absorption tower according to claim 8, characterized in that, The exhaust assembly also includes a return pipe, an exhaust pipe, and a gas detection sensor; The delivery pipe and the air inlet pipe are connected by a return pipe; the end of the second piston cylinder away from the second cylinder is connected to an exhaust pipe, and the outer end of the exhaust pipe extends out of the side wall of the tower body for external exhaust treatment equipment. A gas detection sensor is also installed at the end of the second piston cylinder away from the second cylinder; solenoid valves for controlling the gas flow and shut-off are installed on the delivery pipe, return pipe and exhaust pipe.

10. An ammonia tail gas absorption tower according to claim 6, characterized in that, The cooling component includes a hose and a cooling chamber; multiple hoses are installed on the lower surface of the upper partition, and the other end of the hoses is connected to the upper end of the fixed cylinder; the interior of the fixed cylinder is provided with a cooling chamber that communicates with the hoses, and the top of the cooling chamber is provided with an exhaust port that communicates with the absorption chamber. After the cooling medium completes heat exchange, it can be discharged through the exhaust port.

Images