Multi-layer efficient spraying type formaldehyde absorption tower

Abstract

The invention relates to the field of formaldehyde treatment, and particularly discloses a multilayer efficient spraying type formaldehyde absorption tower which comprises a bottom bin used for containing formaldehyde absorption liquid and a top bin communicated with a fan, a plurality of reaction bins are arranged between the top bin and the bottom bin, and filler plates for limiting filler balls are arranged at the bottoms of the reaction bins. Pressure drop buffering mechanisms are arranged in the reaction bins except the reaction bins adjacent to the bottom bin, and each pressure drop buffering mechanism comprises movable pipes which are movably arranged in the vertical direction in a circumferential array mode. After the equipment is cleaned and maintained, when the equipment is restarted, the other movable pipes are located at the first station, that is, the movable pipes are communicated with the filler plate, gas passes through the movable pipes, and at the moment, formaldehyde gas is reacted and absorbed by the reaction bin at the bottom layer; and after formaldehyde is absorbed by the gas passing through the bottom reaction bin, the gas can more easily pass through the other reaction bins along the movable pipe, so that the burden of the fan is reduced, and the pressure drop phenomenon is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to formaldehyde treatment technology, in particular to a multi-layer high-efficiency spray type formaldehyde absorption tower. BACKGROUND

[0002] It is known that the formaldehyde spray type absorption tower is used for the interaction of formaldehyde gas through atomized absorption liquid, which can be used as a formaldehyde waste gas purification environmental protection equipment, and also can be used as a formaldehyde absorption section production equipment.

[0003] For example, the utility model patent with the application publication number CN217163802U and the application publication date of August 12, 2022, and the name of “a spray type waste gas absorption tower for chlorobenzene formaldehyde production” includes an absorption tower main body, a water tank is assembled on one side of the absorption tower main body, a conveying pipe is installed between the water tank and the absorption tower main body, a spray nozzle is installed on the lower surface of the sprayer at one end of the conveying pipe, an exhaust pipe is installed at the top end of the absorption tower main body, an air inlet pipe is assembled on one side of the absorption tower main body, and a drain port is formed on one side of the lower end of the absorption tower main body. When the device is in use, the liquid droplets flow down along the surface of the multiple groups of fan-shaped plates, so that a water curtain is formed in the gap between the adjacent two groups of fan-shaped plates, so that the waste gas can only pass through the water curtain to continue to rise, thereby facilitating the slowing down of the rising speed of the waste gas, and the gas can be further purified.

[0004] For example, the invention patent with the application publication number CN106422677A and the application publication date of February 22, 2017, and the name of “a new type of formaldehyde spray type absorption tower” includes a tank body, a formaldehyde absorption liquid input port is arranged at the top end of the tank body, and a formaldehyde absorption liquid recovery port 3 is arranged at the bottom end of the tank body. The input port and the recovery port are connected by a circulating pipeline, and a pump body 4 is arranged on the circulating pipeline. A formaldehyde process gas inlet 6 is arranged on one side of the tank body. A group of fillers are also arranged in the tank body. The other side of the tank body is also provided with a group of formaldehyde absorption liquid inlets, which are connected with the circulating pipeline through a pipeline. The present application has the advantages of simple structure, easy modification on the existing equipment, can effectively improve the yield and reduce the consumption.

[0005] The existing technology has the following disadvantages: multiple layers of fillers and spray equipment are arranged in the multi-layer spray tower, a plurality of gaps and grooves are arranged in the fillers for increasing the gas-liquid contact surface and thereby increasing the interaction efficiency. In particular, in the multi-layer spray tower, the formaldehyde gas needs to pass through the multiple layers of fillers in sequence, so that the formaldehyde in the gas that contacts the upper half of the fillers has been absorbed by the lower half, which results in low purification efficiency of the increased gas-liquid contact surface of the upper half, and causes a burden to the fan. SUMMARY

[0006] The present application aims to provide a multi-layer high-efficiency spray type formaldehyde absorption tower to solve the above problems in the prior art.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a multi-layer high-efficiency spray type formaldehyde absorption tower, comprising a bottom bin for containing formaldehyde absorption liquid and a top bin connected with a fan, a plurality of reaction bins are arranged between the top bin and the bottom bin, a filler plate for limiting filler balls is arranged at the bottom of each reaction bin, a pressure drop alleviating mechanism is arranged in each reaction bin except the one adjacent to the bottom bin, the pressure drop alleviating mechanism comprises a movable pipe arranged in a circumferential array in the vertical direction, and the movable pipe is assembled in the following two working positions:

[0008] The first working position: the movable pipe is in communication with the filler plate, so that the gas passes through the movable pipe;

[0009] The second working position: the movable pipe is driven away from the filler plate, so that the filler balls move close to each other.

[0010] As a further description of the above technical scheme: the filler plate comprises a first filler plate and a second filler plate, the first filler plate is arranged in the bottommost reaction bin, and the second filler plate is arranged in the remaining reaction bins.

[0011] As a further description of the above technical scheme: a liquid guide chassis corresponding to the movable pipe is arranged on the second filler plate, a butt joint convex pipe is arranged on the liquid guide chassis, the movable pipe is in butt joint with the butt joint convex pipe, and the first working position is maintained.

[0012] As a further description of the above technical scheme: a plurality of external protrusions are arranged in a circumferential array on the outer wall of the movable pipe, and the external protrusions abut against the filler balls to generate gaps.

[0013] As a further description of the above technical scheme: a plurality of internal protrusions corresponding to the external protrusions are arranged on the inner wall of the movable pipe, and the internal protrusions are semicircular arcs to block the formaldehyde absorption liquid.

[0014] As a further description of the above technical scheme: a fixing frame is arranged in the reaction bin, a rotating ring sleeved on the movable pipe is rotatably connected to the fixing frame, a plurality of spiral sections are formed on the external protrusions, and the spiral sections are threadedly connected to the rotating ring.

[0015] As a further description of the above technical scheme: a fixed pipe is fixedly connected to the filler plate, a limiting head is arranged at the end of the fixed pipe, and the limiting head is slidably connected to the internal protrusion.

[0016] As the further description of the technical scheme, the liquid guide chassis is provided with a plurality of perforations, the liquid guide chassis is fixedly connected with a fixed pipe, and the movable pipe vertically slides along the fixed pipe.

[0017] As the further description of the technical scheme, the movable pipe is switched to the second station when the absorption capacity of the lower reaction bin decreases.

[0018] As the further description of the technical scheme, the fixed frame is rotatably connected with a rotating disc, the rotating disc is provided with a driving gear ring, and the rotating ring is provided with an outer driving gear coupled with the driving gear ring.

[0019] In the above technical scheme, the multi-layer high-efficiency spray type formaldehyde absorption tower has the following beneficial effects: after the equipment is cleaned and maintained, the remaining movable pipes are in the first station when it is restarted, that is, the movable pipes are connected with the filler plates, so that the gas passes through the movable pipes, at this time, the formaldehyde gas is reacted and absorbed by the bottom reaction bin, and after the gas passes through the bottom reaction bin, the gas absorbed by the formaldehyde can more easily pass through the remaining reaction bins, thereby reducing the burden of the fan and relieving the pressure drop phenomenon. In continuous use, the filler balls 13 in the bottom reaction bin are affected by the combination of the attachment of impurities and the thickening of the absorption liquid, so that the absorption capacity of the dirty attached to the filler balls is poor. After the pressure relief mechanism of the upper layer is started, that is, after the absorption capacity of the bottom reaction bin decreases, the movable pipes in the reaction bin of the upper layer are switched to the second station. At this time, the movable pipes are driven away from the filler plates of the layer, so that the filler balls 13 of the layer fill the positions of the movable pipes, so that the entire layer of the reaction bin does not have a gap that is easy to pass through, and thus the absorption capacity of the bottom reaction bin is compensated. By changing the absorption efficiency, the direction of the gas flow purification is changed, the burden of the fan is reduced, the gas flow path is optimized, and the invalid absorption path is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0021] Figure 1 The overall structure schematic diagram provided by the embodiments of the present application is provided.

[0022] Figure 2 The overall structure cross-sectional schematic diagram provided by the embodiments of the present application is provided.

[0023] Figure 3 The Figure 2 The enlarged structure schematic diagram at A in the middle is provided.

[0024] Figure 4 This is an exploded view of the pressure reduction mechanism structure provided in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0026] Figure 6 This is an exploded view of the overall structure provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the reaction chamber and observation window structure provided in an embodiment of the present invention;

[0028] Figure 8 A cross-sectional schematic diagram of the reaction chamber provided in an embodiment of the present invention;

[0029] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0030] Figure 10 This is a schematic diagram of the reaction chamber and packing balls provided in an embodiment of the present invention.

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

[0032] 1. Bottom chamber; 10. Observation window; 11. Air inlet; 12. First packing plate; 13. Packing ball; 2. Reaction chamber; 21. Second packing plate; 22. Liquid guide base frame; 221. Perforation; 222. Connecting protrusion; 3. Top chamber; 4. Output pipe; 5. Liquid filling chamber; 51. Liquid outlet pipe; 52. Mist frame; 6. Pressure reduction mechanism; 61. Movable pipe; 611. Outer protrusion; 612. Helical cut; 614. Inner protrusion; 62. Fixed pipe; 621. Limiting head; 63. Rotating ring; 631. Internal thread; 632. External drive tooth; 64. Rotating disk; 641. Drive gear ring; 65. Fixed frame. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Please see Figures 1-10The embodiment of the present application provides a technical scheme: a multi-layer high-efficiency spray type formaldehyde absorption tower, which comprises a bottom bin 1 used for containing formaldehyde absorption liquid, a gas inlet 11 is formed in the bottom bin 1, the gas inlet 11 is communicated with a formaldehyde-containing gas output machine, an output pipe 4 is arranged on a top bin 3, the output pipe 4 is communicated with a fan, and the formaldehyde-free gas after purification is discharged, a plurality of reaction bins 2 are arranged between the top bin 3 and the bottom bin 1, a filler ball 13 is arranged in each reaction bin 2, the filler ball 13 is limited by a filler plate at the bottom of the reaction bin 2, the absorption liquid can pass through the filler ball 13 and the filler plate, a liquid adding bin 5 is arranged in the bottom bin 1, the liquid adding bin 5 adds mother liquor to the bottom of the bottom bin 1, a water pump is arranged at the bottom of the bottom bin 1, a mist shelf 52 is arranged at the top of the reaction bin 2, the output end of the water pump is communicated with a plurality of mist shelves 52 through a liquid outlet pipe 51, the formaldehyde absorption liquid is sprayed out of the mist shelf 52 and sprayed on the filler ball 13, so that the gas-liquid area is increased, a pressure drop alleviating mechanism 6 is arranged in each reaction bin 2 except the reaction bin 2 adjacent to the bottom bin 1, the pressure drop alleviating mechanism 6 comprises a movable pipe 61 which is arranged in a vertical direction and is arranged in a circumferential array, the movable pipe 61 is assembled in the following two stations, when the equipment is cleaned and maintained and then restarted, the movable pipe 61 is in the first station, that is, the movable pipe 61 is communicated with the filler plate, so that the gas passes through the movable pipe 61, at this time, the formaldehyde gas is reacted and absorbed by the bottom reaction bin 2, and after the formaldehyde in the gas passing through the bottom reaction bin 2 is absorbed, the gas can more easily pass through the remaining reaction bins 2 along the movable pipe 61, so that the burden of the fan is reduced, and the pressure drop phenomenon is alleviated, and after the continuous use, when the filler ball 13 in the bottom reaction bin 2 is attached with impurities and the absorption liquid is thickened, the absorption capacity of the filler ball 13 is reduced, the pressure drop alleviating mechanism 6 of the upper layer is started, that is, when the absorption capacity of the bottom reaction bin 2 is reduced, the movable pipe 61 in the reaction bin 2 of the upper layer is switched to the second station, at this time, the movable pipe 61 is driven away from the filler plate of the layer, so that the filler ball 13 of the layer fills the position of the movable pipe 61, so that the whole reaction bin 2 does not have a gap that is easy to pass through, and thus the absorption capacity of the bottom reaction bin 2 is compensated, the absorption efficiency is changed, the direction of the gas flow purification is changed, the burden of the fan is reduced, the gas flow path is optimized, and the invalid absorption path is reduced.

[0035] Further, the filler plate comprises a first filler plate 12 and a second filler plate 21, the first filler plate 12 is arranged in the bottommost reaction bin 2, the second filler plate 21 is arranged in the remaining reaction bins 2, and holes are formed in the first filler plate 12 and the second filler plate 21, the holes are used for the gas to pass through the filler ball 13 and be drawn away by the fan.

[0036] In another embodiment of the present application, the second filler plate 21 is provided with a liquid guide base 22 corresponding to the movable pipe 61, the liquid guide base 22 is like Figure 3As shown, the part towards the bottom is a circular truncated cone with a central opening, and the liquid guide base 22 is provided with a butt protruding pipe 222, when cleaning, the filler ball 13 is taken out, then the movable pipe 61 is butt-jointed with the butt protruding pipe 222 to be clamped, so as to maintain the movable pipe 61 in the first station, and then the filler ball 13 is put in again to fill the periphery of the movable pipe 61, and the rising gas carries the absorption liquid mist, so that the mist sprayed by the mist frame 52 is carried upwards by the gas, and part of the absorption liquid directly contacts the filler ball 13 in the form of mist, and then the absorption liquid in the reaction bin 2 flows downwards along the liquid guide base 22 of the circular truncated cone, so as to reduce the absorption liquid sprayed on the filler ball 13 in the non-started reaction bin 2, thereby protecting the filler ball 13.

[0037] As shown in another embodiment provided by the present application, Figure 5 and Figure 10 As shown, the outer wall of the movable pipe 61 is provided with a plurality of outer protrusions 611 in a circumferential array, and the side surface of the outer protrusion 611 is provided with a hole, when the filler ball 13 is arranged in the reaction bin 2, the outer protrusion 611 abuts against the filler ball 13 to form a gap, the gap is used for the absorption liquid to pass through or flow into the movable pipe 61 along the outer protrusion 611, and when the station is switched, the movable pipe 61 slides in the vertical direction.

[0038] Preferably, the inner wall of the movable pipe 61 is provided with a plurality of inner protrusions 614 corresponding to the outer protrusions 611, and the holes between the outer protrusions 611 and the inner protrusions 614 are connected, when the absorption liquid flows along the inner wall of the movable pipe 61, the top of the inner protrusion 614 is semicircular, the semicircular inner protrusion 614 guides the absorption liquid to flow to both sides, so as to avoid the tension of the absorption liquid to block the hole in the side wall of the movable pipe 61, thereby ensuring the passability of the absorption liquid, especially when the absorption liquid becomes thick with absorption but no new mother liquor is added, the guided avoidance of the hole can avoid the absorption liquid to block the hole in the side wall of the movable pipe 61.

[0039] Preferably, the second filler plate 21 is fixedly connected with a fixed pipe 62, as shown in Figure 5 the fixed pipe 62 is provided with a limiting head 621 at the end, the limiting head 621 is slidingly connected to the inner protrusion 614, the limiting head 621 can limit the vertical sliding of the movable pipe 61 along the outer protrusion 611, and can limit the freedom degree of the axis rotation direction of the movable pipe 61, and a plurality of holes are formed in the fixed pipe 62, after the movable pipe 61 slides in the vertical direction along the limiting head 621, the absorption liquid can still smoothly pass through the movable pipe 61 and the fixed pipe 62, so as to promote the circulation of the absorption liquid.

[0040] Further, the fixed pipe 62 is fixedly connected in the liquid guide base 22 of the second filler plate 21, and a plurality of through holes 221 are formed in the liquid guide base 22, and the absorption liquid flows out along the through holes 221 and then flows along the circular truncated cone slope to the fixed pipe 62.

[0041] In still another embodiment of the present application, the reaction chamber 2 is provided with a fixing frame 65, the fixing frame 65 is rotatably connected with a rotating ring 63 sleeved on the movable tube 61, the inner wall of the rotating ring 63 is provided with an internal thread 631, a plurality of outer protrusions 611 are provided with a helical surface 612, the helical surface 612 is threadedly connected to the internal thread 631 of the rotating ring 63, when it is needed to drive the movable tube 61 to slide along the vertical direction, the rotating ring 63 is driven to rotate, thereby driving the movable tube 61 to slide along the fixed tube 62.

[0042] Further, the structure for driving the rotating ring 63 to rotate can be a motor.

[0043] Preferably, as shown in the drawings, Figure 4 The fixing frame 65 is rotatably connected with a rotating disc 64, the rotating disc 64 is provided with a driving gear ring 641, the rotating ring 63 is provided with an outer driving gear 632 coupled with the driving gear ring 641, the driving gear ring 641 is driven to rotate by driving the rotating disc 64, a motor is arranged on the top chamber 3, the output end of the motor is connected with a transmission shaft with a telescopic motor, the rotating disc 64 is driven to rotate by the telescopic motor, when the overall structure size is large, a plurality of separate motors can drive the rotating disc 64 to rotate through a belt or chain transmission, the reaction chamber 2 is provided with an observation window 10, the observation window 10 faces the rotating disc 64.

[0044] In the process of cleaning and maintenance of the device, first take out a number of packing balls 13 for cleaning, then rotate the rotating disc 64, drive the movable pipe 61 to re-clamp on the liquid guide chassis 22, and put in the packing ball 13, after cleaning and maintenance, re-enable the remaining movable pipe 61 in the first station, that is, the movable pipe 61 is connected with the packing plate, so that the gas passes along the movable pipe 61, at this time the bottom layer of the reaction bin 2 reacts and absorbs formaldehyde gas, and the gas after the bottom layer of the reaction bin 2 is absorbed by formaldehyde can pass through the remaining reaction bin 2 more easily along the movable pipe 61, so as to reduce the burden of the fan and relieve the pressure drop phenomenon, and in the continuous use, the packing balls 13 in the bottom layer of the reaction bin 2 are attached with impurities, the absorption liquid is thickened, and the combination of the two influences causes the packing balls 13 to be attached with dirt and the absorption capacity to be poor, so the pressure relief mechanism 6 of the upper layer is started, that is, when the absorption capacity of the bottom layer of the reaction bin 2 decreases, the movable pipe 61 in the reaction bin 2 of the upper layer is switched to the second station, at this time the movable pipe 61 is driven away from the packing plate of the layer, so that the packing balls 13 of the layer fill the position of the movable pipe 61, so that the whole layer of the reaction bin 2 does not have a gap that is easy to pass through and needs to pass through along the packing balls 13, so as to compensate for the poor absorption capacity of the bottom layer of the reaction bin 2, change the absorption efficiency, change the direction of gas flow purification, reduce the burden of the fan, and optimize the gas flow path, reduce the invalid absorption path, during which the absorption liquid can flow along the circular table-shaped liquid guide chassis 22 to the movable pipe 61 below, reduce the absorption liquid on the packing balls 13 in the reaction bin 2 that is not started, so as to protect the packing balls 13.

[0045] The foregoing merely describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present application.

Claims

1. A multi-layer high-efficiency spray-type formaldehyde absorption tower, comprising a bottom chamber (1) for holding formaldehyde absorption liquid and a top chamber (3) connected to a fan, wherein a plurality of reaction chambers (2) are arranged between the top chamber (3) and the bottom chamber (1), and a packing plate for restricting packing balls (13) is provided at the bottom of the reaction chambers (2), characterized in that, Except for the reaction chamber (2) adjacent to the bottom chamber (1), each chamber is equipped with a pressure relief mechanism (6). The pressure relief mechanism (6) includes a movable tube (61) arranged vertically in a circular array. The movable tube (61) is assembled at the following two stations: First station: The movable tube (61) is connected to the packing plate, so that gas passes through the movable tube (61); Second station: The movable tube (61) is driven away from the packing plate, causing the packing balls (13) to move closer to each other.

2. The multi-layer high-efficiency spray formaldehyde absorption tower according to claim 1, characterized in that, The packing plate includes a first packing plate (12) and a second packing plate (21). The first packing plate (12) is disposed in the bottommost reaction chamber (2), and the second packing plate (21) is disposed in the remaining reaction chambers (2).

3. The multi-layer high-efficiency spray formaldehyde absorption tower according to claim 2, characterized in that, The second packing plate (21) is provided with a liquid guiding base (22) corresponding to the movable tube (61) one by one. The liquid guiding base (22) is provided with a docking protrusion (222). The movable tube (61) docks with the docking protrusion (222) to maintain the first working position.

4. The multi-layer high-efficiency spray formaldehyde absorption tower according to claim 1, characterized in that, The outer wall of the movable tube (61) is provided with a plurality of external protrusions (611) arranged in a circumferential array, and the external protrusions (611) abut against the packing ball (13) to create a gap.

5. A multi-layer high-efficiency spray-type formaldehyde absorption tower according to claim 4, characterized in that, The inner wall of the active tube (61) is provided with a plurality of inner protrusions (614) that correspond one-to-one with the outer protrusions (611). The inner protrusions (614) are semi-circular arc-shaped to block the formaldehyde absorption liquid.

6. A multi-layer high-efficiency spray formaldehyde absorption tower according to claim 4, characterized in that, The reaction chamber (2) is provided with a fixed frame (65), and a rotating ring (63) sleeved on the movable tube (61) is rotatably connected to the fixed frame (65). A spiral cut surface (612) is opened on a plurality of external protrusions (611), and the spiral cut surface (612) is threadedly connected to the rotating ring (63).

7. A multi-layer high-efficiency spray-type formaldehyde absorption tower according to claim 5, characterized in that, A fixed tube (62) is fixedly connected to the packing plate, and a limiting head (621) is provided at the end of the fixed tube (62). The limiting head (621) is slidably connected to the inner protrusion (614).

8. A multi-layer high-efficiency spray-type formaldehyde absorption tower according to claim 3, characterized in that, The liquid guiding base (22) has several perforations (221), and a fixed tube (62) is fixedly connected to the liquid guiding base (22). The movable tube (61) slides vertically along the fixed tube (62).

9. A multi-layer high-efficiency spray-type formaldehyde absorption tower according to claim 1, characterized in that, The active tube (61) switches to the second station as the absorption capacity of the reaction chamber (2) below decreases.

10. A multi-layer high-efficiency spray-type formaldehyde absorption tower according to claim 6, characterized in that, A rotating disk (64) is rotatably connected to the fixed frame (65), a drive gear ring (641) is provided on the rotating disk (64), and an external drive tooth (632) coupled to the drive gear ring (641) is provided on the rotating ring (63).

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