An exhaust gas purification tower

Abstract

The application discloses a waste gas purification tower, and belongs to the technical field of gas filtration. The waste gas purification tower comprises a tower body, a plurality of filler cages and a dredging mechanism. The bottom side and the top of the tower body are respectively provided with an air inlet pipe and an air outlet pipe. The plurality of filler cages are arranged in the tower body and are distributed in layers along the axial direction of the tower body. The filler cages are filled with bulk fillers. The dredging mechanism is arranged between the filler cages and the inner wall of the tower body and is used for driving the telescopic cylinders to extend and retract in sequence. In the waste gas purification tower, a plurality of filler cages are arranged. Each filler cage has a telescopic structure. When dust and stains filtered from the bulk fillers gradually accumulate to form silt and block the bulk fillers, the mass transfer efficiency is reduced. The dredging mechanism can be used to expand the filler cages in layers, so that the silt is separated from the bulk fillers, and the normal waste gas separation and purification capacity is restored.

Description

Technical Field

[0001] This invention relates to the field of gas filtration technology, and more specifically to a waste gas purification tower. Background Technology

[0002] Industrial production processes generate large amounts of waste gas containing various pollutants. To reduce environmental pollution from these waste gases, waste gas purification towers are widely used in the field of waste gas treatment. Currently, most waste gas purification towers adopt a packed tower structure. By filling the tower with bulk packing material, the waste gas and the absorbent liquid can fully contact on the surface of the packing material, thereby achieving the absorption and purification of pollutants in the waste gas.

[0003] However, existing waste gas purification towers have some shortcomings. On the one hand, with the increase of usage time, dust and dirt filtered down the bulk packing material gradually accumulate, forming sludge blockage, which leads to a decrease in mass transfer efficiency and affects the purification effect of waste gas. In order to restore the purification capacity, it is usually necessary to manually disassemble the packing material for cleaning or replacement, which is not only cumbersome, but also consumes a lot of manpower and time costs. Summary of the Invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of this invention is to provide a waste gas purification tower that can clean the sludge in the bulk packing material and maintain the separation and purification effect of waste gas.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a waste gas purification tower, including a tower body, multiple packing cages and a sludge removal mechanism, wherein an air inlet pipe and an air outlet pipe are respectively provided on one side of the bottom and the top of the tower body;

[0006] Multiple packing cages are arranged inside the tower body and distributed layer by layer along the tower body axis. Each packing cage includes a bottom plate, a top plate and a telescopic cylinder. The bottom plate and the top plate are respectively arranged at the upper and lower ends of the telescopic cylinder and are both provided with air-permeable grids. The cavity formed by the bottom plate, the top plate and the telescopic cylinder is filled with bulk packing.

[0007] The dredging mechanism is located between the packing cage and the inner wall of the tower body, and is used to drive the telescopic cylinder to extend and retract in sequence.

[0008] The uppermost packing cage is equipped with a liquid distribution device for spraying absorbent liquid onto the packing cage below. After the exhaust gas enters the tower through the inlet pipe, it passes through multiple packing cages from bottom to top and is then discharged through the outlet pipe.

[0009] Preferably, the telescopic cylinder includes an inner cylinder and an outer cylinder, the outer cylinder is sleeved on the inner cylinder, the outer cylinder and the inner cylinder are slidably sealed together by a sealing ring, the top plate is fixed to the top of the outer cylinder, and the bottom plate is fixed to the bottom of the inner cylinder.

[0010] Preferably, the tower body is provided with a plurality of connecting rings, each corresponding to a plurality of packing cages, and a support portion is provided on the inner wall of the tower body below the lowest packing cage; the upper edge of the connecting ring is fixed to the bottom edge of the inner cylinder, the lower edge of the connecting ring is fixed to the outer cylinder of the lower packing cage, and the lower edge of the lowest connecting ring abuts against the support portion.

[0011] Preferably, the dredging mechanism includes multiple lifting units, which are mounted on the tower body and are used to drive the multiple outer cylinders to rise and fall.

[0012] Among them, the outer cylinder of the uppermost packing cage is fixed with a retaining ring, which is slidably sealed to the inner wall of the tower. Multiple lifting units sequentially drive multiple outer cylinders to move up or down.

[0013] Preferably, the lifting unit includes a plurality of first cylinders fixed inside the tower body, the plurality of first cylinders being evenly distributed around the outer cylinder, one end of the first cylinder being fixedly connected to the inner wall of the tower body, and the other end of the first cylinder being fixedly connected to the outer cylinder.

[0014] Preferably, the connecting ring is provided with a collection trough, and the top of the connecting ring is provided with a guide slope, so that the sludge flowing down the inner wall of the inner cylinder in the packing cage enters the collection trough along the guide slope.

[0015] Preferably, the bottom of the collection tank is provided with a sludge discharge hole, and the inner cylinder is fixedly connected with a first sealing plate for sealing the sludge discharge hole. When the connecting ring rises, the sludge discharge hole is separated from the first sealing plate, and the sludge in the collection tank flows from the sludge discharge hole into the sludge storage tank formed by the support part below and the inner wall of the tower.

[0016] Preferably, the support is provided with a second sealing plate that cooperates with the sludge discharge hole on the lowest collection trough, and a plurality of second cylinders are provided on the inner wall of the tower body. One end of the second cylinder is fixedly connected to the inner wall of the tower body, and the other end is fixedly connected to the lowest connecting ring.

[0017] Preferably, a sludge discharge pipe communicating with a sludge storage tank is provided on the outer wall of the tower body, and a valve is provided on the sludge discharge pipe.

[0018] Preferably, each of the packing cages is provided with a silt-blocking mechanism below it. The silt-blocking mechanism includes a bracket fixed in the connecting ring and a fan blade rotatably mounted on the bracket. When the fan blade rotates, it generates an upward airflow, which disturbs the bulk packing in the upper packing cage and throws the silt falling on the fan blade toward the inner wall of the connecting ring.

[0019] The beneficial effects of this invention are as follows:

[0020] The waste gas purification tower designed in this invention incorporates multiple packing cages, each with a retractable structure. When the cage is compressed, the bulk packing material completely fills it. A liquid distribution device at the top of the tower sprays absorbent liquid onto the bulk packing material from top to bottom, causing a water film to adhere to the surface of the packing material. When waste gas passes through multiple layers of bulk packing material for absorption and purification, it is discharged from the outlet pipe. As filtered dust and dirt gradually accumulate in the bulk packing material, forming sludge and causing blockages, leading to a decrease in mass transfer efficiency, a sludge removal mechanism can expand the packing cages layer by layer, providing space for the bulk packing material to rise and tumble. This allows lightweight bulk packing materials such as Raschig rings to disperse and tumble within the packing cages under the influence of airflow. The invention increases the spacing between bulk packing materials, causing them to collide and detach from the packing material, thus restoring normal waste gas separation and purification capabilities. A connecting ring with a guide slope and collection trough is installed between adjacent packing cages. Due to the wall flow effect, the sludge in the upper packing cage gradually flows towards the inner wall of the cage as it flows downwards, entering the collection trough and significantly reducing or preventing the sludge from flowing further into the lower bulk packing material. A sludge discharge hole is provided in the collection trough, and a first sealing plate is designed below the discharge hole. When the connecting ring moves upwards, the discharge hole disengages from the first sealing plate, causing the sludge to concentrate in the lower storage trough and ultimately be discharged from the tower body through the discharge pipe. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional view of the overall structure of a waste gas purification tower provided in an embodiment of the present invention.

[0023] Figure 2 This is a top view of a waste gas purification tower provided in an embodiment of the present invention.

[0024] Figure 3 for Figure 2 Sectional view at point AA.

[0025] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0026] Figure 5 for Figure 3 A magnified view of a section at point B in the middle.

[0027] Figure 6This is a perspective view of multiple packing cages and connecting rings in an exhaust gas purification tower provided in an embodiment of the present invention.

[0028] Figure 7 This is a perspective view of a single packing cage and connecting ring in an exhaust gas purification tower provided in an embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of a waste gas purification tower in the sludge removal state, provided as an embodiment of the present invention.

[0030] Figure 9 for Figure 8 A magnified view of a section at point C.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Tower body; 11. Inlet pipe; 12. Outlet pipe; 2. Packing cage; 21. Bottom plate; 22. Top plate; 23. Telescopic cylinder; 231. Inner cylinder; 232. Outer cylinder; 3. Liquid distribution device; 4. Connecting ring; 41. Collection tank; 42. Guide slope; 43. Sludge discharge hole; 44. First sealing plate; 45. Sludge storage tank; 46. Support; 47. Fan blade; 5. Support part; 51. Second sealing plate; 6. Retaining ring; 7. First cylinder; 8. Second cylinder; 9. Sludge discharge pipe. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1:

[0035] like Figures 1 to 9 As shown, Embodiment 1 of the present invention provides a waste gas purification tower for purifying and separating dust and harmful components in gas. The waste gas purification tower includes a cylindrical tower body 1, four packing cages 2, and a sludge removal mechanism. Figure 3 As shown, the tower body 1 is a vertically arranged hollow column structure with an air inlet pipe 11 on one side of the bottom and an air outlet pipe 12 on the top. The air inlet pipe 11 is used to introduce the waste gas to be purified, and the air outlet pipe 12 is used to discharge the purified gas.

[0036] Four packing cages 2 are distributed layer by layer along the axial direction of the tower body 1 from low to high. Each packing cage 2 includes a bottom plate 21, a top plate 22, and a telescopic cylinder 23. Figure 4As shown, the telescopic cylinder 23 includes an inner cylinder 231 and an outer cylinder 232. The outer cylinder 232 is fitted onto the inner cylinder 231, and the two are slidably sealed together by a sealing ring. This ensures smooth expansion and contraction of the inner cylinder 231 and the outer cylinder 232 while preventing gas leakage. A top plate 22 is fixed to the top of the outer cylinder 232, and a bottom plate 21 is fixed to the bottom of the inner cylinder 231. The top plate 22, bottom plate 21, and telescopic cylinder 23 form a complete packing cage 2, which has space inside to accommodate bulk packing. To ensure smooth gas flow from the bottom to the top of the packing cage 2 and through it, both the bottom plate 21 and the top plate 22 are provided with permeable mesh. The mesh size of the permeable mesh is smaller than the bulk packing particles to prevent leakage of the bulk packing. Lightweight bulk packing such as Raschig rings is used.

[0037] like Figure 4 As shown, when the packing cage 2 is in a compressed state, the bulk packing can fill the entire receiving cavity, resulting in a smaller spacing between the particles. Figures 3 to 6 As shown, a liquid distribution device 3 is installed above the uppermost packing cage 2 at the top of the inner cavity of the tower body 1. The liquid distribution device 3 includes a water pipe connected to an external liquid supply device and multiple evenly distributed nozzles installed on the water pipe. The nozzles evenly spray the absorbent liquid onto the packing cage 2 below. The absorbent liquid flows downward and coats the surface of the bulk packing in the four layers of packing cage 2 below with a water film. Thus, when the waste gas passes through the bulk packing, dust and harmful gases are separated from the waste gas through gas-liquid mass transfer, thereby achieving the purification treatment of the waste gas.

[0038] In order to control the extension and retraction of the telescopic cylinders 23 in the packing cage 2, this invention designs a sludge removal mechanism inside the tower body 1. The sludge removal mechanism is located between the packing cage 2 and the inner wall of the tower body 1, and its function is to sequentially drive the four telescopic cylinders 23 to extend and retract. Figure 3 and Figure 4As shown, a retaining ring 6 is fixed to the outer cylinder 232 of the uppermost packing cage 2. The retaining ring 6 is slidably sealed to the inner wall of the tower body 1, thus ensuring that gas does not leak between the packing cage 2 and the inner wall of the tower body 1, allowing gas to pass only through the packing cage 2. The sludge removal mechanism includes four lifting units, which are used to drive the lifting and lowering of the four outer cylinders 232 in the four packing cages 2. The inner cylinder 231 in the upper packing cage 2 is fixedly connected to the outer cylinder 232 in the lower packing cage 2, and the inner cylinder 231 of the lowest packing cage 2 abuts against the annular support 5 fixed inside the tower. To ensure the outer cylinder 232 remains stable when moving on the inner cylinder 231, each lifting unit includes at least two first cylinders 7 symmetrically distributed on both sides of the outer cylinder 232. Multiple first cylinders 7 are evenly distributed around the outer cylinder 232, and the fixed end of each first cylinder 7 is fixedly connected to the inner wall of the tower body 1 through a base, while the other end is fixedly connected to the outer cylinder 232 through a connecting plate. The axial direction of the first cylinder 7 is parallel to the axial direction of the tower body 1. The extension and retraction of the first cylinder 7 drives the lifting and lowering of the outer cylinder 232, thereby controlling the volume change of the packing cage 2.

[0039] After the exhaust gas enters the tower through the inlet pipe 11, it can only pass through multiple packing cages 2 sequentially from bottom to top due to the baffle ring 6 and support 5. During this process, the exhaust gas comes into full contact with the absorbent liquid, and the pollutants are absorbed and purified. The purified exhaust gas is then discharged from the outlet pipe 12. When the accumulated sludge in the bulk packing causes a decrease in mass transfer efficiency, the lifting unit can raise the outer cylinder 232 of the packing cage 2 layer by layer, expanding the volume of the packing cage 2 and providing space for the bulk packing to rise and tumble. Figure 9 As shown, at this point, the lightweight bulk packing material disperses and tumbles under the action of airflow. This not only increases the spacing between the bulk packing particles, making it easier for the sludge to detach, but also the collisions between the bulk packing materials accelerate the detachment of the sludge from the packing, thus completing the sludge removal process. Afterwards, the packing cage 2 is restored to its compressed state, the spacing between the bulk packing particles is reduced again, and the normal exhaust gas purification capacity is restored.

[0040] Example 2:

[0041] Based on Embodiment 1, the present invention further includes four connecting rings 4 inside the tower body 1, each corresponding to one of the four packing cages 2. For example... Figure 3 and Figure 4 As shown, the upper edges of the three connecting rings 4 are fixedly connected to the bottom edge of the inner cylinder 231 in the corresponding packing cage 2, while the lower edges of the connecting rings 4 are fixedly connected to the outer wall of the outer cylinder 232 of the lower packing cage 2. The connecting rings 4 achieve a fixed connection between adjacent packing cages 2. Figure 5As shown, the connecting ring 4, which is fixed to the bottom edge of the inner cylinder 231 of the bottommost packing cage 2, abuts against the support part 5. Since the connecting ring 4 seals and fixes the inner cylinder 231 and outer cylinder 232 of two adjacent packing cages 2, with the cooperation of the retaining ring 6 and the support part 5, the exhaust gas can only pass through the four packing cages 2 from bottom to top.

[0042] This invention features a collection trough 41 for collecting sludge water on the connecting ring 4, with a guide slope 42 at the top of the connecting ring 4. The airflow in the middle of the tower body 1 is often stronger than the airflow near the tower wall. Therefore, under the influence of the airflow, the absorbent liquid on the bulk packing will exhibit wall flow as it flows downwards, concentrating on the side wall of the packing cage 2. This causes the sludge flowing downwards along the inner wall of the inner cylinder 231 in the upper packing cage 2 to enter the collection trough 41 along the guide slope 42, thereby greatly reducing or preventing the sludge water from continuing to flow into the lower bulk packing, effectively preventing the lower packing from being contaminated by the sludge in the upper packing.

[0043] To better facilitate dredging and ensure the sludge flows into the collection tank 41, this invention also includes a silt-blocking mechanism below each packing cage 2. For example... Figure 9 As shown, the silt-blocking mechanism includes a support 46 and a fan blade 47. The support 46 is fixed inside the connecting ring 4 and positioned between the two packing cages 2. The fan blade 47 is rotatably mounted on the support 46, which is equipped with a waterproof motor for driving the fan blade 47 to rotate. With the above configuration, when cleaning the packing cage 2, the fan blade 47 can be driven to rotate. When the fan blade 47 rotates, it generates an upward airflow, which compensates for the insufficient airflow from the lower intake and more strongly disturbs the bulk packing in the upper packing cage 2, making the packing more loose. The silt water falling from above lands on the fan blade 47, and under the action of centrifugal force, the silt is thrown towards the inner wall of the connecting ring 4 and finally falls into the collection tank 41. This greatly reduces the possibility of silt accumulating on the lower packing cage 2 and further improves the silt removal effect.

[0044] Example 3:

[0045] Based on Embodiments 1 and 2, considering that the sludge in the collection tank 41 will gradually fill up, in order to facilitate the cleaning of the sludge, such as Figure 4 and Figure 9As shown, the present invention provides multiple drainage holes 43 at the bottom of the collection trough 41 on each connecting ring 4. A first sealing plate 44 in an annular shape is fixed to the connecting ring 4 below the collection trough 41 via multiple support pillars. Since the connecting ring 4 is fixedly connected to the inner cylinder 231, the first sealing plate 44 is also fixedly connected to the inner cylinder 231 via the connecting ring 4. Thus, when the packing cage 2 is in a compressed state, the first sealing plate 44 can block the drainage holes 43, thereby maintaining a sealed connection between the connecting ring 4 and the upper and lower packing cages 2. When the connecting ring 4 rises under the action of the lifting unit, the drainage holes 43 disengage from the first sealing plate 44, allowing the sludge water in the collection trough 41 to flow from the drainage holes 43 into the sludge storage trough 45 formed by the lower support 5 and the inner wall of the tower body 1.

[0046] like Figure 5 As shown, the bottom of the collection trough 41 of the lowest connecting ring 4 is also provided with a sludge discharge hole 43, and a second sealing plate 51 that cooperates with the sludge discharge hole 43 is provided on the support part 5. In order to drive the inner cylinder 231 in the lowest packing cage 2 to move upward, the present invention provides two second cylinders 8 on the inner wall of the tower body 1. The two second cylinders 8 are respectively located on both sides of the packing cage 2. One end of the second cylinder 8 is fixedly connected to the inner wall of the tower body 1 through the base, and the other end is fixedly connected to the lowest connecting ring 4 through the connecting plate. When the second cylinder 8 extends, it can drive the connecting ring 4 to move upward, thereby separating the second sealing plate 51 from the sludge discharge hole 43, so that the sludge water in the lowest collection trough 41 can also be discharged into the sludge storage tank 45.

[0047] A sludge discharge pipe 9 connected to the sludge storage tank 45 is fixed on the outer wall of the tower body 1. A valve is installed on the sludge discharge pipe 9 to facilitate the periodic discharge of sludge from the sludge storage tank 45 out of the tower.

[0048] During operation, exhaust gas enters the tower body 1 through the inlet pipe 11, passes through four compressed packing cages 2, and is discharged from the outlet pipe 12. The adsorbent liquid on the surface of the bulk particles in the packing cages 2 forms a water film. Dust and harmful components in the exhaust gas dissolve in this water film, separating the dust from the airflow. When excessive dust accumulates on the bulk particles, forming sludge and blocking the airflow, the lifting units are activated sequentially from top to bottom, causing the packing cages 2 to expand. At this time, the volume of the packing cages 2 increases, providing a larger scattering space for the lightweight bulk packing. Under the action of the fan blades 47 below, the sludge tumbles and collides within the packing cages 2, causing it to detach from the bulk packing and enter the collection tank 41. Finally, it passes through the sludge storage tank 45 and is discharged from the discharge pipe 9, completing the cleaning of the bulk packing and restoring the equipment's purification capacity.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A waste gas purification tower, characterized in that, It includes a tower body, multiple packing cages and a sludge removal mechanism, wherein an air inlet pipe and an air outlet pipe are respectively provided on one side of the bottom and the top of the tower body; Multiple packing cages are arranged inside the tower body and distributed layer by layer along the tower body axis. Each packing cage includes a bottom plate, a top plate and a telescopic cylinder. The bottom plate and the top plate are respectively arranged at the upper and lower ends of the telescopic cylinder and are both provided with air-permeable grids. The cavity formed by the bottom plate, the top plate and the telescopic cylinder is filled with bulk packing. The dredging mechanism is located between the packing cage and the inner wall of the tower body, and is used to drive the telescopic cylinder to extend and retract in sequence. The uppermost packing cage is equipped with a liquid distribution device for spraying absorbent liquid onto the packing cage below. After the exhaust gas enters the tower through the inlet pipe, it passes through multiple packing cages from bottom to top and is then discharged from the outlet pipe. The telescopic cylinder includes an inner cylinder and an outer cylinder. The outer cylinder is sleeved on the inner cylinder. The outer cylinder and the inner cylinder are slidably sealed together by a sealing ring. The top plate is fixed to the top of the outer cylinder, and the bottom plate is fixed to the bottom of the inner cylinder. The dredging mechanism includes multiple lifting units, which are installed on the tower body and are used to drive the lifting and lowering of the multiple outer cylinders respectively. Among them, the outer cylinder of the uppermost packing cage is fixed with a retaining ring, which is slidably sealed to the inner wall of the tower. Multiple lifting units sequentially drive multiple outer cylinders to move up or down.

2. The waste gas purification tower as described in claim 1, characterized in that, The tower body is provided with multiple connecting rings, each corresponding to a multiple packing cage. A support is provided on the inner wall of the tower body below the lowest packing cage. The upper edge of the connecting ring is fixed to the bottom edge of the inner cylinder, and the lower edge of the connecting ring is fixed to the outer cylinder of the lower packing cage. The lower edge of the lowest connecting ring abuts against the support.

3. The waste gas purification tower as described in claim 1, characterized in that, The lifting unit includes multiple first cylinders fixed inside the tower body. The multiple first cylinders are evenly distributed around the outer cylinder. One end of the first cylinder is fixedly connected to the inner wall of the tower body, and the other end of the first cylinder is fixedly connected to the outer cylinder.

4. The waste gas purification tower as described in claim 2, characterized in that, The connecting ring is provided with a collection trough, and the top of the connecting ring is provided with a guide slope. The sludge flowing down the inner wall of the inner cylinder in the packing cage enters the collection trough along the guide slope.

5. A waste gas purification tower as described in claim 4, characterized in that, The bottom of the collection tank is provided with a sludge discharge hole. The inner cylinder is fixedly connected with a first sealing plate for sealing the sludge discharge hole. When the connecting ring rises, the sludge discharge hole is separated from the first sealing plate, and the sludge in the collection tank flows from the sludge discharge hole into the sludge storage tank formed by the support part below and the inner wall of the tower.

6. The waste gas purification tower as described in claim 5, characterized in that, The support is provided with a second sealing plate that mates with the sludge discharge hole on the lowest collection trough. Multiple second cylinders are provided on the inner wall of the tower body. One end of the second cylinder is fixedly connected to the inner wall of the tower body, and the other end is fixedly connected to the lowest connecting ring.

7. A waste gas purification tower as described in claim 5, characterized in that, The outer wall of the tower is equipped with a sludge discharge pipe that communicates with the sludge storage tank, and the sludge discharge pipe is equipped with a valve.

8. The waste gas purification tower as described in claim 2, characterized in that, Each of the packing cages is provided with a silt-blocking mechanism below it. The silt-blocking mechanism includes a bracket fixed in the connecting ring and a fan blade rotatably mounted on the bracket. When the fan blade rotates, it generates an upward airflow, which disturbs the bulk packing in the upper packing cage and throws the silt falling on the fan blade toward the inner wall of the connecting ring.

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