Low-alkali-consumption sulfuric acid tail gas desulfurization device

Abstract

The invention relates to the field of sulfuric acid production tail gas desulfurization, in particular to a low-alkali-consumption sulfuric acid tail gas desulfurization device which comprises an absorption tower and a reverse spraying tower connected with the absorption tower, a horizontal communicating pipe communicated with the reverse spraying tower is arranged in the absorption tower, the bottom of the communicating pipe is communicated with a flow dividing pipe, and the flow dividing pipe is connected with an exhaust pipe. The bottom of the exhaust pipe extends to the position below the liquid level of the absorption liquid and is provided with an exhaust hole, the flow dividing pipe can rotate, and a driving device, a control device, a connecting device and the like are further arranged to control communication and position change of the exhaust pipe and the flow dividing pipe. The device achieves the technical effects that the alkali consumption is reduced in the tail gas desulfurization process, the desulfurization efficiency and effect are improved, full contact reaction of the tail gas and the absorption liquid is achieved through a series of structural designs, and the exhaust state can be flexibly controlled to adapt to different working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas desulfurization, in particular to a low-alkali-consumption sulfuric acid tail gas desulfurization device. BACKGROUND

[0002] With the emphasis of the state on environmental protection, the enhancement of environmental protection consciousness and the popularization of environmental protection regulations, most of the sulfuric acid enterprises in China have increased investment in sulfuric acid tail gas treatment, and the liquid column desulfurization tower has become the focus of attention due to its full gas-liquid mass transfer and high desulfurization efficiency.

[0003] The sulfuric acid tail gas desulfurization device in the prior art mainly comprises an absorption tower, the absorption tower is connected with an inverse spray tower, the top of the inverse spray tower is connected with an air inlet pipe, a spraying device is arranged in the inverse spray tower, the sulfuric acid tail gas enters the inverse spray tower from the air inlet pipe, the spraying device sprays the absorption liquid, the sulfuric acid tail gas contacts with the absorption liquid to realize a desulfurization reaction, and a sulfite or sulfate solution is generated, then the sulfuric acid tail gas passes through the connecting pipe at the bottom of the inverse spray tower and enters the absorption tower, the absorption liquid is stored at the bottom of the absorption tower, the air outlet end of the connecting pipe extends below the liquid level of the absorption liquid, the sulfuric acid tail gas is discharged from the connecting pipe and contacts with the absorption liquid stored at the bottom of the absorption tower to perform a secondary reaction, thereby effectively reducing the content of sulfur dioxide in the tail gas and achieving the purpose of efficient desulfurization.

[0004] Since the sulfuric acid tail gas is discharged from the connecting pipe, the connecting pipe used is usually a relatively thick pipe, so that the discharged sulfuric acid tail gas forms relatively large bubbles in the absorption liquid, the rising path of the bubbles is relatively concentrated, the contact area with the absorption liquid is limited, and the reaction time is insufficient, in order to make up for the loss of efficiency and ensure that the sulfur content of the outlet tail gas meets the standard, a large amount of absorption liquid needs to be stored in the absorption tower, which often requires additional consumption of more absorption liquid, thereby directly leading to the problem of excessively high alkali consumption in the operation cost. SUMMARY

[0005] In order to solve the problem of excessively high alkali consumption in the operation process of the existing device, the present application provides a low-alkali-consumption sulfuric acid tail gas desulfurization device.

[0006] A low-alkali-consumption sulfuric acid tail gas desulfurization device, comprising an absorption tower, the absorption tower is connected with an inverse spray tower, the bottom of the inverse spray tower is communicated with the absorption tower, the absorption tower stores absorption liquid at the bottom, a communication pipe communicated with the inverse spray tower is arranged in the absorption tower, the communication pipe is horizontally arranged, a plurality of shunt pipes are communicated with the bottom of the communication pipe, a plurality of exhaust pipes are connected with the shunt pipes, the exhaust pipes are communicated with the shunt pipes, the bottom of the exhaust pipes extends below the liquid level of the absorption liquid, and a plurality of exhaust holes are arranged at the bottom of the exhaust pipes.

[0007] By adopting the above technical solution, the reverse spray tower is connected to the absorption tower, and the bottom of the exhaust pipe extends below the surface of the absorbent liquid. The tail gas enters the connecting pipe through the reverse spray tower, and then exits from the exhaust hole at the bottom of the exhaust pipe through the diversion pipe and fully contacts the absorbent liquid. The exhaust pipe is evenly distributed in the absorption tower. After the tail gas is discharged from the exhaust pipe, it reacts fully with the absorbent liquid, thereby achieving desulfurization of sulfuric acid tail gas and reducing alkali consumption.

[0008] Preferably, there are two diversion pipes, which are vertically arranged. The exhaust pipes are arranged in a circumferential array on the corresponding diversion pipes. The diversion pipes are rotatably connected to the connecting pipes. The rotation axis of the diversion pipes is perpendicular to the axis of the connecting pipes. The reverse spray tower is equipped with a drive device for driving the diversion pipes to rotate.

[0009] By adopting the above technical solution, two vertical diversion pipes are set up, and the exhaust pipe is arranged in a circumferential array on the corresponding diversion pipe and rotatedly connected to the connecting pipe. The diversion pipe is driven to rotate by a driving device, which can make the exhaust gas more evenly dispersed into the absorbent liquid. At the same time, the exhaust pipe can also agitate the absorbent liquid, increase the contact area and contact time between the exhaust gas and the absorbent liquid, and improve the desulfurization efficiency.

[0010] Preferably, the driving device includes a main shaft rotatably mounted on the connecting pipe, the main shaft being vertically mounted and connected to an external power source of the absorption tower, a drive gear being fixedly connected to the main shaft, and driven gears meshing with the drive gear being fixedly connected to the two diversion pipes.

[0011] By adopting the above technical solution, the main shaft is connected to an external power source of the absorption tower, and the diversion pipe is driven to rotate through the meshing of the active gear and the driven gear. The drive structure is simple and the operation is reliable.

[0012] Preferably, the diverter pipe has a diverter hole corresponding to the exhaust pipe, the diverter pipe is fitted with a sliding sleeve, several exhaust pipe ends are fixedly connected to the sliding sleeve, the sliding sleeve is slidably connected to the diverter pipe, the sliding sleeve is slidably disposed on the diverter pipe in a vertical direction, the diverter pipe is provided with a first elastic element that drives the sliding sleeve to slide upward, the first elastic element drives the sliding sleeve to slide and then remain in the position where the diverter hole communicates with the exhaust pipe, the communicating pipe is provided with a control device, the control device is used to drive the sliding sleeve to slide downward to partially cover the position of the diverter hole.

[0013] By adopting the above technical solution, a diversion hole and a sliding sleeve are provided on the diversion pipe. The sliding sleeve is fixed to the exhaust pipe and can slide vertically along the diversion pipe. The first elastic element keeps the sliding sleeve in a position where the diversion hole and the exhaust pipe are fully connected. The control device can drive the sliding sleeve to slide down to partially cover the diversion hole, which can flexibly control the exhaust path and flow rate of the tail gas, further optimize the contact process between the tail gas and the absorbent liquid, and improve the desulfurization effect and the adaptability of the device.

[0014] Preferably, the control device includes a control ring sleeved outside the diverter pipe, the control ring being slidably connected to the connecting pipe, and the bottom surface of the control ring being able to abut or separate from the exhaust pipe after vertical sliding. The connecting pipe is also provided with a connecting device, which is used to connect the drive device and the control device. When the drive device drives the diverter pipe to rotate forward and backward, the connecting device drives the control ring to slide upward or downward.

[0015] By adopting the above technical solution, the control ring is sleeved outside the diversion pipe and slidably connected to the connecting pipe. The connecting device can drive the control ring to slide up and down when the driving device drives the diversion pipe to rotate in both directions. This allows the position of the sliding sleeve to be controlled, so that the diversion hole is fully connected to the exhaust pipe or partially covered. This allows for flexible adjustment of the situation of the tail gas entering the absorbent liquid, further improving the desulfurization effect and reducing alkali consumption.

[0016] Preferably, the connecting device includes a connecting plate, which is slidably connected to the connecting pipe in a vertical direction. The connecting plate has a first through hole for the diverter pipe to pass through and a second through hole for the main shaft to pass through. The control ring is fixedly mounted on the connecting plate. The main shaft is connected to an external power source via a worm gear transmission. The worm gear is mounted on the main shaft, and the main shaft has a connecting mechanism. When the worm gear rotates in the forward direction, the connecting mechanism drives the connecting plate to slide downward until the bottom surface of the control ring abuts against the exhaust pipe. When the worm gear rotates in the reverse direction, the connecting mechanism drives the connecting plate to slide upward until the control ring disengages from the exhaust pipe.

[0017] By adopting the above technical solution, the main shaft is connected to an external power source through a worm gear drive. When the worm gear rotates in the forward direction, the connecting mechanism drives the connecting plate to slide downward, so that the bottom surface of the control ring abuts against the exhaust pipe. This, in turn, drives the sliding sleeve to slide downward to partially cover the diversion hole to control the gas discharge. When the worm gear rotates in the reverse direction, the connecting mechanism drives the connecting plate to slide upward, so that the control ring disengages from the exhaust pipe. Under the action of the first elastic element, the sliding sleeve returns to the position where the diversion hole and the exhaust pipe are fully connected, realizing flexible control of the exhaust gas discharge, improving desulfurization efficiency and the controllability of the device.

[0018] Preferably, the worm gear is rotatably connected to the main shaft, and the connecting mechanism includes a push block that is slidably disposed on the main shaft. A lever is fixedly connected to the push block. The worm gear is provided with a guide groove for the lever to cooperate with. The guide groove is arc-shaped. The end of the push block is provided with a guide slope facing the inner wall of the second through hole.

[0019] By adopting the above technical solution, the worm gear is rotatably connected to the main shaft, the push block is slidably connected to the main shaft, and the lever cooperates with the worm gear guide groove. When the worm gear rotates, the lever slides in the guide groove, causing the push block to slide radially along the main shaft. The guide slope at the end of the push block can play a guiding role when the push block slides above the connecting plate, ensuring smooth cooperation between the push block and the connecting plate and other components, thereby controlling the connection state of the exhaust pipe and the diversion pipe, and thus optimizing the distribution of exhaust gas in the absorbent liquid and the desulfurization effect.

[0020] Preferably, the connecting plate and the connecting pipe are connected by a telescopic rod, and the telescopic rod is provided with a second elastic element, which is used to drive the connecting plate to slide upward.

[0021] By adopting the above technical solution, the connecting plate and the connecting pipe are connected by a telescopic rod. The second elastic element inside the telescopic rod can drive the connecting plate to slide upward. After the external force that drives the control ring to slide downward disappears, the connecting plate can drive the control ring to reset upward, ensuring the stability and repeatability of the device operation, which is conducive to continuous and efficient tail gas desulfurization.

[0022] Preferably, there are three push blocks arranged in a circumferential array around the main shaft. A sleeve is fixedly connected to the main shaft, and the push blocks are slidably disposed in the corresponding sleeves. The sleeves are provided with waist-shaped grooves for the lever to extend out.

[0023] By adopting the above technical solution, the three push blocks are arranged in a circular array around the main shaft, making the distribution of the push blocks more uniform and enabling them to cooperate more stably with other components. The push blocks are slidably set in the corresponding sleeves and the lever extends through the waist-shaped groove on the sleeves, which can ensure that the lever can work normally when the push blocks slide, thus ensuring the stability of power transmission and control.

[0024] Preferably, the bottom of the push block is provided with a first guide wheel and a second guide wheel. The rotation axis of the first guide wheel and the rotation axis of the second guide wheel are arranged perpendicular to each other. The first guide wheel is arranged close to the guide slope relative to the second guide wheel. The rotation axis of the second guide wheel is arranged along the length direction of the push block. The connecting plate is provided with a protruding ring around the second through hole. When the push block slides above the connecting plate, the second guide wheel abuts against the protruding ring.

[0025] By adopting the above technical solution, the bottom of the push block is equipped with a first guide wheel and a second guide wheel with mutually perpendicular rotating shafts, and a convex ring is provided on the connecting plate. When the push block slides to the top of the connecting plate, the second guide wheel abuts against the convex ring, which can make the push block slide more smoothly and stably, reduce jamming and wear, and ensure that the connecting mechanism can accurately drive the connecting plate to slide up and down, thereby realizing the control ring to control the sliding sleeve, ensuring the dispersion of tail gas in the absorbent liquid and the stable operation of the desulfurization process.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By connecting several branch pipes at the bottom of the connecting pipe, and connecting several exhaust pipes on the branch pipes, with the bottom of the exhaust pipes extending below the surface of the absorbent liquid and having exhaust holes, the sulfuric acid tail gas is dispersed and discharged, increasing the contact area with the absorbent liquid, improving reaction efficiency, and reducing alkali consumption; 2. The branch pipes are rotatably set and driven to rotate by a drive device, which makes the tail gas more evenly distributed in the absorbent liquid, further increasing the contact area and reaction time with the absorbent liquid, and improving the desulfurization effect; 3. The control device can drive the sliding sleeve to slide, realize the coverage and connection control of the branch holes, adjust the discharge speed of the tail gas from the exhaust holes, adapt to different desulfurization needs, and reduce unnecessary absorbent liquid consumption. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the internal structure of the absorption tower according to an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the drive device structure according to an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the connection device structure according to an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the connection structure according to an embodiment of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Absorption tower; 2. Backflow tower; 3. Connecting pipe; 31. Diversion pipe; 311. Diversion hole; 32. Bearing seat; 4. Sliding sleeve; 41. Exhaust pipe; 411. Abutting wheel; 412. Exhaust hole; 5. Drive device; 51. Main shaft; 511. Driving gear; 52. Driven gear; 53. Motor; 531. Worm; 54. Worm wheel; 541. Guide groove; 6. First spring; 7. Connecting device; 71. Connecting plate; 711. Control ring; 712. Convex ring; 713. First through hole; 714. Second through hole; 72. Telescopic rod; 73. Connecting mechanism; 731. Sleeve; 732. Pushing block; 7321. Lever; 7322. First guide wheel; 7323. Second guide wheel; 7324. Guide slope; 733. Second spring. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0034] This application discloses a low-alkali-consumption sulfuric acid tail gas desulfurization device. (Refer to...) Figure 1A low-alkali-consumption sulfuric acid tail gas desulfurization device includes an absorption tower 1 and a reverse spray tower 2. Absorbent liquid is stored at the bottom of the absorption tower 1, and the bottom of the reverse spray tower 2 is connected to the side wall of the absorption tower 1. The tail gas generated during the sulfuric acid production process enters from the top of the reverse spray tower 2. Spray heads are installed in the reverse spray tower 2, which spray the absorbent liquid to neutralize the sulfuric acid tail gas once. Then, the sulfuric acid tail gas enters the reverse spray tower 2 for aeration. The absorbent liquid in the absorption tower 1 neutralizes the sulfuric acid tail gas a second time. The treated sulfuric acid tail gas is finally discharged from the exhaust port at the top of the absorption tower 1.

[0035] Reference Figure 2 as well as Figure 3 A connecting pipe 3 is fixedly connected inside the absorption tower 1. The connecting pipe 3 is horizontally arranged, with one end connected to the reverse spray tower 2 and the other end sealed. Two diversion pipes 31 are connected to the bottom of the connecting pipe 3. The two diversion pipes 31 are vertically arranged, and each diversion pipe 31 has several exhaust pipes 41 arranged in a circular array. The exhaust pipes 41 are L-shaped and include a horizontal section and a vertical section. The horizontal section of the exhaust pipe 41 is connected to the diversion pipe 31. The bottom of the vertical section of the exhaust pipe 41 extends below the surface of the absorbent liquid and has several exhaust holes 412 arranged in a circular array at the bottom of the exhaust pipe 41.

[0036] To improve aeration efficiency, the top of the diversion pipe 31 is rotatably connected to the connecting pipe 3. The rotation axis of the diversion pipe 31 is vertically oriented. The top of the diversion pipe 31 is rotatably connected to the connecting pipe 3 via a bearing. A bearing seat 32 is provided on the connecting pipe 3, and a rotational sealing structure is provided between the connecting pipe 3 and the diversion pipe 31 to ensure that sulfuric acid tail gas does not leak out between the diversion pipe 31 and the connecting pipe 3 while the diversion pipe 31 is rotating. A drive device 5 is provided inside the reverse spray tower 2 to drive the diversion pipe 31 to rotate. After the diversion pipe 31 rotates, it drives the exhaust pipe 41 to rotate synchronously. The exhaust pipe 41 not only allows sulfuric acid tail gas to be discharged but also agitates the absorbent liquid, further improving the reaction effect between the sulfuric acid tail gas and the absorbent liquid, reducing the amount of absorbent liquid used, and thus reducing the alkali consumption of the entire desulfurization unit.

[0037] The drive device 5 includes a main shaft 51 rotatably mounted on the connecting pipe 3. The main shaft 51 is vertically mounted and coincides with the central axis of the absorption tower 1. A motor 53 is fixedly connected to the outside of the absorption tower 1. The output shaft of the motor 53 is connected to the main shaft 51 via a worm gear 54 and a worm 531. The output shaft of the motor 53 is connected to the worm 531. The worm gear 54 is mounted on the main shaft 51. The main shaft 51 is positioned between two branch pipes 31, which are symmetrically arranged about the main shaft 51. A drive gear 511 is fixedly connected to the main shaft 51 and is horizontally mounted. A driven gear 52 that meshes with the drive gear 511 is fixedly connected to the two branch pipes 31. The driven gear 52 is coaxially mounted with the corresponding branch pipe 31. After the motor 53 drives the main shaft 51 to rotate, the two branch pipes 31 can be driven to rotate through the drive gear 511 and the driven gear 52.

[0038] A diversion hole 311 is provided on the diversion pipe 31 corresponding to the exhaust pipe 41. In order to achieve full or partial opening of the diversion hole 311 according to the exhaust gas flow rate, a sliding sleeve 4 is provided on the outer sleeve of the diversion pipe 31. The inner wall of the sliding sleeve 4 fits against the outer wall of the diversion pipe 31. The sliding sleeve 4 is slidably disposed on the diversion pipe 31 in the vertical direction. The sliding sleeve 4 and the diversion pipe 31 are slidably connected by a slide rail and a slide groove. The horizontal end of the exhaust pipe 41 is fixedly disposed on the corresponding sliding sleeve 4. Several exhaust pipes 41 are arranged in a circumferential array on the sliding sleeve 4. A first elastic element, namely a first spring 6, is provided on the diversion pipe 31 to drive the sliding sleeve 4 to slide upward. The first spring 6 is sleeved on the outside of the diversion pipe 31 and located below the sliding sleeve 4. One end of the first spring 6 is fixed to the diversion pipe 31, and the other end is fixed to the bottom surface of the sliding sleeve 4. The first spring 6 drives the sliding sleeve 4 to slide upward. When the first spring 6 is in its original length state, the diversion hole 311 is aligned and connected with the corresponding exhaust pipe 41.

[0039] Reference Figure 4 as well as Figure 5 A control device is provided on the connecting pipe 3 to drive the sliding sleeve 4 to slide downward. The control device can drive the sliding sleeve 4 to slide to a position that partially covers the diversion hole 311. In this embodiment, when the sliding sleeve 4 slides downward to the lowest point, the bottom surface of the sliding sleeve 4 coincides with the diameter of the diversion hole 311, and the sliding sleeve 4 can cover half of the opening area of ​​the separation hole, that is, the diversion hole 311 is in a half-open state.

[0040] The control device includes a control ring 711 sleeved outside the diversion pipe 31. The control ring 711 is vertically slidable on the connecting pipe 3, and its inner diameter is larger than the outer diameter of the sliding sleeve 4. When the control ring 711 slides upward to its highest point, it disengages from the exhaust pipe 41. Under the action of the first spring 6, the exhaust pipe 41 remains fully open with the diversion hole 311, which can handle situations with a large tail gas input flow. When the control ring 711 slides downward to its lowest point, its bottom surface abuts against the exhaust pipe 41. Simultaneously, the sliding sleeve 4 also slides to its lowest point, partially blocking the diversion hole 311, leaving the exhaust pipe 41 and the diversion hole 311 in a semi-connected state. This can handle situations with a small tail gas input flow, ensuring that the exhaust gas flow rate in the exhaust hole 412 remains stable, thereby ensuring the reaction quality of the sulfuric acid tail gas in the secondary reaction process and improving the tail gas purification quality.

[0041] To reduce the friction between the control ring 711 and the exhaust pipe 41, an abutment wheel 411 is rotatably connected to the exhaust pipe 41. The abutment wheel 411 is sleeved on the outside of the horizontal section of the exhaust pipe 41 and can rotate relative to the exhaust pipe 41. When the split pipe 31 rotates, the abutment wheel 411 slides on the bottom surface of the control ring 711, thereby reducing the wear of the control ring 711 on the split pipe 31.

[0042] To facilitate the switching of the drive control ring 711 between the highest and lowest positions, a connecting device 7 is provided on the connecting pipe 3. The connecting device 7 is used to connect the drive device 5 and the control device. When the drive device 5 drives the diversion pipe 31 to rotate in the forward direction, the connecting device 7 drives the control ring 711 to slide down to the lowest point; when the drive device 5 drives the diversion pipe 31 to rotate in the reverse direction, the connecting device 7 drives the control ring 711 to slide up to the highest point.

[0043] The connecting device 7 includes a connecting plate 71, which is horizontally positioned below the connecting pipe 3. The connecting plate 71 has a first through hole 713 for the diversion pipe 31 to pass through and a second through hole 714 for the main shaft 51 to pass through. A control ring 711 is fixedly mounted on the bottom surface of the connecting plate 71, with its axis coaxial with the axis of the first through hole 713. A worm gear 54 is rotatably mounted on the main shaft 51, positioned between the drive gear 511 and the connecting plate 71. A connecting mechanism 73 is also provided on the main shaft 51, located between the worm gear 54 and the connecting plate 71. When the worm gear 54 rotates forward, the connecting mechanism 73 drives the connecting plate 71 to slide downward to the lowest point; when the worm gear 54 rotates in the reverse direction, the connecting mechanism 73 drives the connecting plate 71 to slide upward to the highest point.

[0044] Telescopic rods 72 are fixedly connected to both ends of the connecting plate 71. The telescopic rods 72 are vertically arranged, with the bottom of the telescopic rods 72 fixed to the connecting plate 71 and the top of the telescopic rods 72 fixed to the connecting pipe 3. The connecting mechanism 73 includes a second spring 733 disposed inside the telescopic rods 72. When the second spring 733 is in its original length state, the connecting plate 71 is located at its highest point.

[0045] The connecting mechanism 73 includes a sleeve 731 and a pressing block 732. The sleeve 731 is fixedly mounted on the main shaft 51 and arranged radially along the main shaft 51. There are three sleeves 731 and three pressing blocks 732. The three sleeves 731 are arranged in a circumferential array on the main shaft 51. The pressing block 732 slides along the length of the sleeve 731 and is arranged in the corresponding sleeve 731. The end of the pressing block 732 is provided with a guide slope 7324 facing the inner wall of the second through hole 714. To facilitate the sliding of the push block 732, a lever 7321 is fixedly connected to the push block 732. The lever 7321 is vertically arranged. The sleeve 731 is provided with a waist-shaped groove for the lever 7321 to slide and extend. The worm gear 54 is provided with a guide groove 541 for the lever 7321 to slide. The guide groove 541 is arc-shaped and there are three guide grooves 541. The three guide grooves 541 are distributed clockwise and extend from the center hole of the gear to the outer tooth side.

[0046] When the motor 53 drives the worm gear 54 to rotate, since the main shaft 51 needs to overcome a certain resistance to rotate, the worm gear 54 will first drive the lever 7321 to slide along the guide groove 541. When the lever 7321 slides to the end of the guide groove 541, the lever 7321 can no longer slide, and the worm gear 54 continues to rotate. The worm gear 54 can only overcome the resistance of the main shaft 51 to drive the main shaft 51 to rotate, and then drive the diverter pipe 31 to rotate. When the worm gear 54 rotates in the forward direction, the lever 7321 drives the push block 732 to extend out of the sleeve 731. Under the guidance of the guide slope 7324, the end of the push block 732 presses the connecting plate 71 downward until the end of the push block 732 slides above the connecting plate 71. At this time, the connecting plate 71 is at its lowest point. When the worm gear 54 rotates in the reverse direction, the lever 7321 drives the push block 732 to retract into the sleeve 731. The connecting plate 71 returns to its highest point under the action of the second spring 733. At this time, the push block 732 does not contact the connecting plate 71.

[0047] Since the main shaft 51 needs to rotate continuously, to reduce wear between the push block 732 and the connecting plate 71, a first guide wheel 7322 and a second guide wheel 7323 are rotatably connected to the bottom surface of the end of the push block 732. The rotation axis of the first guide wheel 7322 and the rotation axis of the second guide wheel 7323 are perpendicular to each other. The rotation axis of the second guide wheel 7323 is arranged along the length direction of the push block 732. The first guide wheel 7322 is positioned relative to the second guide wheel 7323 near the guide slope 7324. The first guide wheel 7322 is positioned below the second guide wheel 7323. A convex ring 712 is provided on the connecting plate 71 around the second through hole 714. When the push block 732 slides above the connecting plate 71, the first guide wheel 7322 is used to reduce the friction force on the push block 732 when it slides onto the connecting plate 71. After the push block 732 slides into place, the second guide wheel 7323 abuts against the convex ring 712. The second guide wheel 7323 is used to reduce the friction force between the push block 732 and the connecting plate 71 during the rotation of the main shaft 51.

[0048] The implementation principle of a low-alkali-consumption sulfuric acid tail gas desulfurization device in this application embodiment is as follows: During operation, sulfuric acid tail gas enters through the reverse spray tower 2, undergoes a neutralization reaction in the reverse spray tower 2, and then the sulfuric acid tail gas enters the connecting pipe 3. When the input sulfuric acid tail gas flow rate is low, the motor 53 rotates in the forward direction. Driven by the worm gear 54, the push block 732 extends out of the sleeve 731 and slides above the connecting plate 71. Under the pressure of the push block 732, the connecting plate 71 slides to the lowest point. At this time, the control ring 711 abuts against the exhaust pipe 41, the sliding sleeve 4 is pressed to the lowest point, and the diversion hole 311 remains in a half-open state to ensure that the discharge speed of the sulfuric acid tail gas remains stable. When the sulfuric acid tail gas flow rate is normal or high, the motor 53 rotates in the reverse direction. Driven by the worm gear 54, the push block 732 retracts into the sleeve 731. At this time, the connecting plate 71 slides to the highest point under the drive of the second spring 733, and the sliding sleeve 4 returns to the highest point under the drive of the first spring 6. The diversion holes 311 on the two diversion pipes 31 are in a fully open state. At the same time, the motor 53 can still drive the diversion pipes 31 and the exhaust pipe 41 to rotate in the reverse direction to improve the reaction effect of the sulfuric acid tail gas and the absorption liquid.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-alkali-consumption sulfuric acid tail gas desulfurization device, comprising an absorption tower (1), wherein the absorption tower (1) is connected to a reverse spray tower (2), the bottom of the reverse spray tower (2) is connected to the absorption tower (1), and the bottom of the absorption tower (1) stores an absorbent liquid, characterized in that: The absorption tower (1) is provided with a connecting pipe (3) that communicates with the backspray tower (2). The connecting pipe (3) is horizontally arranged. The bottom of the connecting pipe (3) is connected to several branch pipes (31). Several exhaust pipes (41) are connected to the branch pipes (31). The exhaust pipes (41) are connected to the branch pipes (31). The bottom of the exhaust pipes (41) extends to below the liquid surface of the absorbent. Several exhaust holes (412) are provided at the bottom of the exhaust pipes (41).

2. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 1, characterized in that: There are two diversion pipes (31), which are vertically arranged. The exhaust pipes (41) are arranged in a circumferential array on the corresponding diversion pipes (31). The diversion pipes (31) are rotatably connected to the connecting pipe (3). The rotation axis of the diversion pipes (31) is perpendicular to the axis of the connecting pipe (3). The reverse spray tower (2) is equipped with a drive device (5) for driving the diversion pipes (31) to rotate.

3. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 2, characterized in that: The drive device (5) includes a main shaft (51) rotatably mounted on the connecting pipe (3). The main shaft (51) is vertically mounted and connected to an external power source of the absorption tower (1). A drive gear (511) is fixedly connected to the main shaft (51), and driven gears (52) meshing with the drive gear (511) are fixedly connected to the two diversion pipes (31).

4. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 3, characterized in that: The diversion pipe (31) is provided with a diversion hole (311) corresponding to the exhaust pipe (41). The diversion pipe (31) is fitted with a sliding sleeve (4). The ends of several exhaust pipes (41) are fixedly connected to the sliding sleeve (4). The sliding sleeve (4) is slidably connected to the diversion pipe (31). The sliding sleeve (4) is slidably disposed on the diversion pipe (31) in the vertical direction. The diversion pipe (31) is provided with a first elastic element that drives the sliding sleeve (4) to slide upward. After the first elastic element drives the sliding sleeve (4) to slide, it is held at the position where the diversion hole (311) communicates with the exhaust pipe (41). The connecting pipe (3) is provided with a control device. The control device is used to drive the sliding sleeve (4) to slide downward to partially cover the diversion hole (311).

5. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 4, characterized in that: The control device includes a control ring (711) sleeved outside the diverter pipe (31). The control ring (711) is slidably connected to the connecting pipe (3). After the control ring (711) slides vertically, its bottom surface can abut or separate from the exhaust pipe (41). The connecting pipe (3) is also provided with a connecting device (7). The connecting device (7) is used to connect the drive device (5) and the control device. When the drive device (5) drives the diverter pipe (31) to rotate forward and backward, the connecting device (7) drives the control ring (711) to slide upward or downward.

6. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 5, characterized in that: The connecting device (7) includes a connecting plate (71), which is slidably connected to the connecting pipe (3) in the vertical direction. The connecting plate (71) has a first through hole (713) for the diversion pipe (31) to pass through and a second through hole (714) for the main shaft (51) to pass through. The control ring (711) is fixedly mounted on the connecting plate (71). The main shaft (51) is connected to the external power source through a worm gear (54) and a worm (531). The worm gear (54) is mounted on the main shaft (51), and the main shaft (51) is provided with a connecting mechanism (73). When the worm gear (54) rotates in the forward direction, the connecting mechanism drives the connecting plate (71) to slide downward until the bottom surface of the control ring (711) abuts against the exhaust pipe (41). When the worm gear (54) rotates in the reverse direction, the connecting mechanism (73) drives the connecting plate (71) to slide upward until the control ring (711) disengages from the exhaust pipe (41).

7. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 6, characterized in that: The worm gear (54) is rotatably connected to the main shaft (51). The connecting mechanism (73) includes a push block (732) slidably disposed on the main shaft (51). A lever (7321) is fixedly connected to the push block (732). The worm gear (54) is provided with a guide groove (541) for the lever (7321) to cooperate with. The guide groove (541) is arc-shaped. The end of the push block (732) is provided with a guide slope (7324) facing the inner wall of the second through hole (714).

8. The low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 6, characterized in that: The connecting plate (71) is connected to the connecting pipe (3) by a telescopic rod (72). The telescopic rod (72) is provided with a second elastic element, which is used to drive the connecting plate (71) to slide upward.

9. A low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 7, characterized in that: There are three push blocks (732), which are arranged in a circumferential array around the main shaft (51). A sleeve (731) is fixedly connected to the main shaft (51). The push blocks (732) are slidably disposed in the corresponding sleeves (731). The sleeves (731) are provided with waist-shaped grooves for the lever (7321) to extend out.

10. A low-alkali-consumption sulfuric acid tail gas desulfurization device according to claim 7 or 9, characterized in that: The bottom of the push block (732) is provided with a first guide wheel (7322) and a second guide wheel (7323). The rotation axis of the first guide wheel (7322) and the rotation axis of the second guide wheel (7323) are arranged perpendicular to each other. The first guide wheel (7322) is arranged close to the guide slope (7324) relative to the second guide wheel (7323). The rotation axis of the second guide wheel (7323) is arranged along the length direction of the push block (732). The connecting plate (71) is provided with a protruding ring (712) around the second through hole (714). When the push block (732) slides above the connecting plate (71), the second guide wheel (7323) abuts against the protruding ring (712).

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