KR101485693B1 - Anti-blocking apparatus for eliminator of absorption tower - Google Patents

Abstract

The present invention relates to an apparatus for preventing clogs in an eliminator on an absorption tower, which removes mist attached on the eliminator without separating the eliminator by detecting the clog in the eliminator in advance with use of differential pressure in the absorption tower. In addition, the apparatus can discharge the removed mist out to prevent the falling mist from flowing in a sulfuric acid. The apparatus for preventing clogs in the eliminator on the absorption tower comprises a differential pressure gauge which is connected to the absorption tower by penetrating the upper and lower part from the outside of the absorption tower to measure differential pressure from upper parts to lower parts with respect to the eliminator installed in the absorption tower; a spraying part which sprays fluid to the eliminator; a discharge part which transfers the falling mist from the eliminator to the outside of the absorption tower; a guide blade part which guides the falling mist from the eliminator to the discharge part; and a control part which controls the spraying part, the discharge part respectively and the guide blade part according to signals from the differential pressure gauge.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an absorption tower eliminator,

The present invention relates to an absorption tower eliminator preventing device, and more particularly, to an absorption tower eliminator which removes mist attached to an eliminator by detecting a blockage state of an eliminator through differential pressure in an absorption tower, To a device for preventing a snubber.

There is exhaust gas that occurs when sintering the blended raw material in a sintering plant in a steel mill contains the SO _2, then this SO ₂ is caused serious environmental pollution when released into the atmosphere as a toxic substance that causes pneumonia, bronchitis, asthma, emphysema, etc. .

Sulfuric acid is produced in the sintering plant by using this SO ₂ gas to prevent it from being released into the atmosphere. This process is as follows.

1 and 2, the SO ₂ gas is collected in the adsorption tower 10, the mist contained in the SO ₂ gas is removed by using the dust collector 24, and the SO ₂ gas Is chemically bonded with oxygen in the atmosphere to produce SO ₃ gas.

The SO ₃ gas thus generated is sucked into the absorption tower 100 by the suction force of the dummy 16 and the pen 17. At this time, by detecting the flow rate of the SO ₃ gas in the flow meter 21 and operating the control valve 18 The soft water is sprayed into the absorption tower 100 through the third oil line 14 and the third nozzle 15. [

The SO ₃ gas introduced into the absorption tower 100 reacts with the soft water to become 98% sulfuric acid (A). When the produced sulfuric acid (A) becomes a certain amount or more and is detected by the water level meter 22, And other gases other than SO ₃ are discharged to the stack (23).

However, a small amount of mist remains in the SO ₃ gas that has passed through the dust collector 24 during the process of making the SO ₃ gas into the sulfuric acid (A) using the absorption tower 100, and the aforementioned sulfuric acid production process is repeated There is a problem that the mist is adhered to the collector 110 and clogged.

When the eliminator 110 is clogged by the mist in this way, the suction force generated by the dampers 16 and the pen 17 is weakened and the SO ₃ gas is not sucked into the absorption tower 100, I can not do it.

Conventionally, when such a problem occurs, the operation of cleaning or replacing the eliminator 110 by disassembling the absorption tower 100 takes a long time to reduce the production of sulfuric acid (A) The SO ₃ gas leaks into the atmosphere during the rest of the time, thereby causing environmental pollution.

A method for solving similar problems is specifically known in "a dust collecting apparatus of a steelmaking plant (Patent Registration No. 10-1159950)" and a monitoring apparatus for a filter for liquid and gas (Patent Registration No. 10-0186516).

In the conventional "dust collecting apparatus of a steel making plant (registered patent 10-1159950) ", clogging of a differential pressure pipe connected to a differential pressure meter is prevented to accurately measure a differential pressure and filter cleaning is performed to reduce unnecessary work and repair, A dust collecting device is proposed.

In the dust collecting apparatus of the steel making plant, when dust containing air is introduced into the hopper through the air inlet pipe, the heavy dust falls and accumulates on the lower side of the hopper, and the clean air hung through the filter passes through the filter outer space Exit through the exit.

The particulate matter is gradually adhered to the filter and the pressure in the air inlet pipe becomes larger than the pressure in the outer space of the filter. As the amount of air passing through the filter is decreased, the dust collection efficiency is lowered. Depending on the differential pressure detected by the differential pressure gauge, The compressed air is supplied through the compressed air supply pipe or the filter is vibrated to clean the dust adhered to the filter and discharge it to the outside through the rotary valve of the hopper part.

In this dust collecting apparatus, since the inlet connecting pipe portion of the differential pressure pipe is connected to the air inlet pipe, there is no fear of clogging the differential pressure pipe because there is little dust that flows into the differential pressure pipe, compared with a structure in which the inlet connecting pipe portion is connected to the hopper portion. Therefore, by precisely measuring the differential pressure and cleaning the filter, unnecessary work and repair are reduced, and the dust collecting device is efficiently managed to improve the dust collecting efficiency and increase the life span of the differential pressure pipe.

In addition, in the conventional "monitoring apparatus for liquid and gas filters (registered patent 10-0186516) ", the filter clogging state for filtering impurities of liquid or gas is continuously detected to control the filter replacement time and the flow of the fluid Therefore, we propose a monitoring system for liquid and gas filters that prevents sudden system down.

In this monitoring apparatus, when the cooling fluid flowing into the inlet through the first valve passes through the filter, the impurities contained in the cooling fluid are filtered and output through the second valve at the outlet end.

The filtered cooling fluid output to the second valve flows into the cooling section to circulate the process of cooling various kinds of equipment such as the semiconductor manufacturing equipment and maintaining the temperature at a constant temperature, To set a specific differential pressure.

When the flow rate of the filter is lowered due to the obstruction of the flow of the fluid, the differential pressure between the inlet and outlet of the filter gradually increases. At this time, the differential pressure between the two ends When the actual differential pressure becomes larger, the detection unit outputs a differential pressure detection signal.

When the setting position of the rotary switch arbitrarily set by the user coincides with the position of the specific switching contact, the sensing unit outputs a differential pressure sensing signal indicating that the filter is to be exchanged to the signal generating unit. The signal generator receives the differential pressure detection signal, amplifies the signal sufficiently by the amplifier, and sends it to the comparator, where it compares the reference value with the reference value and outputs the control signal to the solenoid valve.

The solenoid valve operates the air valve by opening the blocked air pressure of 3kg ~ 4kg. The air valve is opened to supply a sufficient amount of cooling fluid to the system in order to relieve the differential pressure generated in the filter. The cooling fluid supplied from the air valve and the cooling fluid supplied through the first and second valves are combined and continuously circulated through the cooling fluid such that the cooling fluid is maintained at a constant temperature.

Such a conventional "dust collecting apparatus of a steelmaking plant (registered patent 10-1159950)" and a "monitoring apparatus for a filter for a liquid and a gas (patent document 10-0186516)" are used to prevent clogging of the eliminator of the absorption tower by mist It is impossible to effectively remove the mist adhered to the eliminator and the removed mist flows into the sulfuric acid produced by falling down to the lower end, and the removed mist can not be discharged to the outside.

Korean Patent No. 10-1159950 (June 19, 2012) Korean Patent No. 10-0186516 (December 29, 1998)

In order to solve such a conventional problem, the present invention detects a clogged state of an eliminator early by using a differential pressure inside an absorption tower, thereby removing the mist adhered to the eliminator without disassembling the absorption tower, And an object of the present invention is to provide an apparatus for preventing clogging of an absorption tower eliminator, which is capable of preventing mist from falling off and flowing into sulfuric acid.

In order to accomplish the above object, the present invention provides an apparatus for preventing clogging of an absorber tower, comprising: an absorber disposed on the absorber outside the absorber so as to measure an upper / / Differential pressure gauge fastened through the bottom; A jetting portion for jetting fluid to the eliminator; A discharge section for transferring the mist falling from the eliminator to the outside of the absorption tower; A guide blade portion for guiding the mist falling from the eliminator to the discharge portion; And a control unit for separately controlling the jetting unit and the discharging unit according to a signal received from the differential pressure gauge and controlling the guide blade unit according to a signal received from the differential pressure gauge.

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Wherein the jetting section has a first oil pipe and a second oil pipe each having a plurality of first nozzles and a second nozzle coupled to an outer circumferential surface thereof and one end thereof projectingly connected to a side surface of the absorption tower, And a first injection valve and a second injection valve which are respectively connected to the absorption tower and the second injection valve to adjust the flow of the fluid, and the injection unit is provided on the upper part of the eliminator so as to remove the mist adhered to the eliminator, In the widthwise direction of the frame.

A first discharge pipe and a second discharge pipe each having a guide line formed on an upper surface thereof for guiding the mist falling from the elevator to the outside and the other end passing through the side surface of the absorption tower; Further comprising a first discharge valve and a second discharge valve respectively coupled to the other ends of the first and second discharge pipes so as to control the discharge of the mist sliding along the first and second discharge pipes to the outside of the absorption tower, And the second discharge pipe is tightened downwardly in the direction of the first and second discharge valves so that the mist can slide in one direction.

The guide blade portion includes a first blade, a second blade, a third blade, and a fourth blade which are rotatably coupled through both side surfaces of the absorption tower, a first sprocket coupled to one end of the first to fourth blades, , A second sprocket, a third sprocket and a fourth sprocket, and a first motor and a second motor respectively fastened to one ends of the first and third blades, wherein the first and second blades The first blade and the fourth blade are disposed on both upper ends of the first discharge tube and are vertically spaced apart from each other in the longitudinal direction of the absorption tower, Wherein the first sprocket is engaged with the second sprocket and the third sprocket is engaged with the fourth sprocket so that when the first motor and the second motor rotate, Profile racket and the third and fourth sprockets is characterized in that it rotates in the opposite direction, respectively.

Wherein the control unit operates the first and second injection valves when the value of the differential pressure gauge is higher than the set value and controls the first and second blades so that the upper gap between the first blade and the second blade becomes wider, And operates the second motor so that the upper gap between the third blade and the fourth blade becomes wider and the lower gap narrows, and at the same time, the first and second discharge valves are opened .

The present invention has the following various effects.

First, since the mist can be removed without decomposing the absorption tower, the eliminator cleaning time can be shortened.

Second, the present invention has an effect of preventing environmental pollution.

Third, the present invention can easily maintain the absorber by grasping the state of the eliminator early.

Fourth, since the present invention is automatically controlled, there is an effect of reducing the manpower required for the mist removing operation.

The present invention has the effect of increasing the production of sulfuric acid.

1 is a schematic view showing a conventional sulfuric acid production process,
2 is a schematic view showing a conventional absorption tower,
FIG. 3 is a perspective view of an absorption tower eliminator clogging prevention device according to the present invention,
4 is an exploded view of an absorber tower eliminator clogging device according to the present invention,
FIG. 5 is a cross-sectional view of an absorber tower eliminator preventing device according to the present invention,
6 is a side cross-sectional view showing a state before the operation of the guide blade portion according to the present invention.
7 is a side cross-sectional view showing the state after the operation of the guide blade portion according to the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

5, the absorption tower eliminator prevention device according to an embodiment of the present invention includes an eliminator 110, a differential pressure gage 500, a jetting unit 400, a discharge unit 300, And a guide blade portion (200).

The eliminator 110 is for removing a small amount of mist contained in the SO ₃ gas sucked into the absorption tower 100 and is fastened in the width direction of the absorption tower 100 in the absorption tower 100. This eliminator 110 is fastened in the absorption tower 100 to prevent the mist from being transferred to the stack 23 when other gases other than the SO ₃ gas move to the stack 23 by the suction force of the pen 17. [ And it is possible to prevent the mist from flowing into the sulfuric acid (A) when producing the sulfuric acid (A) in the absorption tower (100).

The differential pressure gauge 500 measures the pressure difference between the upper portion and the lower portion of the eliminator 110 disposed in the width direction within the absorption tower 100 to grasp the clogged state of the eliminator 110, And is connected to the upper connection pipe 510 passing through the upper part of the elevator 110 from the other side of the main body 100 and the lower connection pipe 520 connected through the lower part.

The jetting unit 400 may be located at the upper end of the eliminator 110 and may spray mist on the surface of the eliminator 110 by spraying soft water on the surface of the eliminator 110. In the present embodiment, the mist is removed by using the soft water used in the production of sulfuric acid (A) in the absorption tower 100. However, depending on the circumstances to which the present invention is applied, various modifications such as distilled water, Lt; / RTI >

The discharging unit 300 is located at the lower end of the eliminator 110 by discharging the mist that has been removed from the eliminator 110 by the jetting unit 400 and falls to the outside.

The guide blade portion 200 guides the mist falling down to the discharge portion 300 so that the mist is removed from the eliminator 110 by the spray portion 400 and does not flow into the produced sulfuric acid A, (110) and the discharge part (300).

3 and 4, the jetting unit 400 includes a first nozzle 430, a second nozzle 460, a first oil pipe 420, a second oil pipe 450, A valve 410 and a second injection valve 440, and a control unit (not shown).

The first oil pipe 420 and the second oil pipe 450 are hollowed to allow soft water to flow therein. A plurality of first nozzles 430 and a plurality of second nozzles 460 are fastened to the outer circumferential surface of the first oil pipe 420 and the second oil pipe 450, One end is protruded through one side of the absorption tower (100). A first injection valve 410 and a second injection valve 440 are coupled to one end of the first oil pipe 420 and the second oil pipe 450 so as to be connected to the first oil pipe 420 and the second oil pipe 450, The flow of the flowing fluid can be controlled.

It is preferable that the jetting unit 400 is positioned horizontally in the width direction of the absorption tower 100 at the upper end of the eliminator 110 to effectively remove the mist adhered to the eliminator 110.

The discharge unit 300 includes a first discharge pipe 310, a second discharge pipe 340, a first discharge valve 320, and a second discharge valve 350. The first discharge pipe 310 and the second discharge pipe 340 are formed with a guide line 330 on an upper surface thereof so as to discharge the mist falling from the eliminator 110 to the outside of the absorption tower 100. In this example, the shape of the guide line 330 is 'U' shape, but this shape may be variously changed if the mist can slide.

Meanwhile, the other end of the first discharge pipe 310 and the second discharge pipe 340 are coupled through the other side of the absorption tower 100, and the mists sliding along the guide line 330 are discharged to the other end thereof The first discharge valve 320 and the second discharge valve 350 are coupled to each other.

It is preferable that the first and second discharge pipes 340 and 340 are screwed downward in the direction of the first and second discharge valves 320 and 350 so that the mist on the guide line 330 can slide in one direction.

The guide blade unit 200 includes a first blade 210, a second blade 240, a third blade 260, a fourth blade 280, a first sprocket 232, a second sprocket 251 A third sprocket 273, a fourth sprocket 291, a first motor 230, and a second motor 271. The first sprocket 291,

A first shaft 220, a second shaft 250, a third shaft 270, and a fourth shaft 290 are provided at the lower ends of the first to fourth blades 210, 240, 260, And the first to fourth shafts 220, 250, 270, and 290 are rotatably coupled through both side surfaces of the absorption tower 100.

A first sprocket 232, a first coupling 231 and a first motor 230 are fastened in order to one end of the first shaft 220 and a first bearing 233, a first sprocket 232, -2 bearing 234 is fastened.

A second-1 bearing 252 and a second sprocket 251 are fastened to one end of the second shaft 250, and a second-2 bearing 253 is fastened to the other end thereof.

A third sprocket 273, a second coupling 272 and a second motor 271 are fastened to one end of the third shaft 270, and a third bearing 274, The bearing 275 is fastened.

A fourth-1 bearing 292 and a fourth sprocket 291 are fastened to one end of the fourth shaft 290, and a fourth-2 bearing 293 is fastened to the other end.

The first sprocket 232 is engaged with the second sprocket 251 and the third sprocket 273 is engaged with the fourth sprocket 291 to rotate the first motor 230 and the second motor 271 The first sprocket 232 and the second sprocket 251 rotate in opposite directions and the third sprocket 273 and the fourth sprocket 291 also rotate in opposite directions.

In order to prevent the first to fourth blades 210, 240, 260, 280 from interfering with each other during rotation, the blades are preferably spaced apart from each other by a predetermined distance. The first blade 210 and the second blade 240 are spaced apart from each other in the longitudinal direction of the absorption tower 100 at the upper ends of the first discharge pipe 310 and the third blade 260, 4 blades 280 are preferably disposed on both upper ends of the second discharge pipe 340 so as to be vertically spaced apart from each other in the longitudinal direction of the absorption tower 100.

With this structure, when the first motor 230 and the second motor 271 are operated, the upper gap between the first blade 210 and the second blade 240 is widened and the lower gap is narrowed, and the third blade 260 And the fourth blade 280 are widened and the interval between the upper and lower ends of the fourth blade 280 is narrowed to induce a mist falling on the first discharge pipe 310 and the second discharge pipe 340.

At this time, the first motor 230 and the second motor 271 are continuously rotated so that the mist formed by the respective blades forms a certain angle and slides in the direction of the first discharge pipe 310 and the second discharge pipe 340 It may be preferable to stop after the predetermined rotation without rotating.

In the present embodiment, the number of the blades is four, but the number of the blades will vary according to the size of the absorption tower 100, and the number of the blades may be changed depending on the size of the blades. Also, it is preferable that the quantity and size of the blades are applied considering the size of the absorption tower 100 so that the falling mist does not flow into the bottom of the absorption tower 100.

The control unit (not shown) separately controls the jetting unit 400, the discharging unit 300 and the guide blade unit 200. When the numerical value of the differential pressure gage 500 becomes higher than the set value, The first injection valve 410 and the second injection valve 440 are operated and the first motor 230 and the second motor 271 are rotated in a predetermined direction while the first discharge valve 320 and the second discharge valve 350 ).

Hereinafter, the operation of the present invention for preventing clogging of the eliminator 110 will be described with reference to FIGS. 4 and 6. FIG.

Prior to the production of sulfuric acid (A) into the absorption tower (100), a set differential pressure value of the differential pressure gauge (500) is inputted using a control unit (not shown). At this time, the input set differential pressure value becomes a reference value for recognizing the clogged state of the elevator 110, and the operator inputs the set differential pressure value together with a cleaning time value for preventing clogging of the eliminator 110. The duration of the processes described below is determined according to the input cleaning time value.

When a suction force is generated as the dampener 16 is opened and the pen 17 rotates and the SO ₃ gas flows into the absorption tower 100, the flow meter 21 recognizes the flow rate of the SO ₃ gas, And controls the control valve 18 in a control unit (not shown) in accordance with the signal of the flow meter 21 to spray the soft water.

The SO ₃ gas reacts with the soft water to form sulfuric acid (A), but other gases are moved to the stones 23 through the dams 16 by the suction force of the pen 17. At this time, the other gases pass through the eliminator 110, and a minute amount of mist contained in the gas is attached to the eliminator 110 while passing through the eliminator 110.

As the amount of mist adhering to the eliminator 110 increases, the amount of gas passing through the eliminator 110 also decreases, thereby causing a pressure difference between the upper and lower sides of the eliminator 110. The pressure difference is measured in real time by the differential pressure meter 500. When a pressure difference corresponding to the set value inputted by the operator is generated, the controller (not shown) recognizes the signal of the differential pressure meter 500 and outputs the signal to the dampers 16 and 18 Is closed, and the rotation of the pen 17 is stopped.

By this procedure, the SO ₃ gas is prevented from flowing into the absorption tower 100. At this time, the first injection valve 410 and the second injection valve 440 are opened by the control unit (not shown) Is supplied to the first oil pipe 420 and the second oil pipe 450 and is injected toward the eliminator 110 through the first nozzle 430 and the second nozzle 460.

At the same time, the control unit (not shown) rotates and stops the first motor 230 and the second motor 271 by a predetermined amount to rotate the first to fourth blades 280, The first discharge valve 320 and the second discharge valve 350 are opened so that a sliding angle can be formed in the direction of the first discharge pipe 310 and the second discharge pipe 340.

The mist that has been attached to the eliminator 110 is dropped by the high-pressure soft water injected from the first nozzle 430 and the second nozzle 460, and falls, and the first blade 210 and the second blade And the mist contacting the third blade 260 and the fourth blade 280 is slid into the second discharge pipe 340. In this case,

The mist loaded in the guide lines 330 of the first discharge pipe 310 and the second discharge pipe 340 is discharged to the outside through the first discharge valve 320 and the second discharge pipe 340 by the inclination of the first discharge pipe 310 and the second discharge pipe 340, 2 discharge valve 350, and is discharged to the outside of the absorption tower 100.

When the cleaning operation is completed, the control unit (not shown) rotates the first motor 230 and the second motor 271 in the opposite direction by a predetermined amount, 1 to the fourth blades 210, 240, 260, 280 to the initial state.

The first injection valve 440, the first motor 230, the second motor 271, and the first and second blades 210, 240, 260, The operation of the first discharge valve 320 and the second discharge valve 350 is stopped, the pen 17 is rotated, and the dummy 16 and the control valve 18 are opened.

After the completion of the cleaning process of the eliminator 110, the differential pressure gauge 500 measures the pressure difference between the upper and lower sides of the eliminator 110 and transmits it to the control unit (not shown).

The differential pressure gauge 500 measures the differential pressure in real time even during the cleaning operation. However, since the differential pressure measured during the cleaning operation is low, the state of the elevator 110 is determined by the differential pressure value measured after the completion of the cleaning operation.

When the measured differential pressure value is equal to or higher than the reference value, the above processes are repeated. When the measured differential pressure value is lower than the reference value, the sulfuric acid (A) production operation is performed. The differential pressure gage 500 measures the differential pressure inside the absorber 100 in real time and transmits a signal to a control unit (not shown) to prevent the eliminator 110 from being clogged.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

10: adsorption tower 100: absorption tower
110: Eliminator 200: Guide blade part
210: first blade 240: second blade
260: third blade 280: fourth blade
300: discharge part 310: first discharge pipe
340: second discharge pipe 400:
410: first injection valve 440: second injection valve
500: Differential pressure gauge

Claims (7)

A differential pressure gauge penetrating through the upper / lower portion of the absorber outside the absorber so as to measure an upper / lower pressure difference around an elevator installed in the absorber;
A jetting portion for jetting fluid to the eliminator;
A discharge section for transferring the mist falling from the eliminator to the outside of the absorption tower;
A guide blade portion for guiding the mist falling from the eliminator to the discharge portion; And
And a control unit for separately controlling the jetting unit and the discharging unit according to a signal received from the differential pressure gauge and controlling the guide blade unit according to a signal received from the differential pressure gauge.
delete delete The method according to claim 1,
Wherein the jetting section has a first oil pipe and a second oil pipe each having a plurality of first nozzles and a second nozzle coupled to an outer circumferential surface thereof and one end thereof projectingly connected to a side surface of the absorption tower, Further comprising a first injection valve and a second injection valve respectively coupled to the first and second injection valves,
Wherein the jetting unit is horizontally positioned in the width direction of the absorption tower at the upper end of the eliminator so as to remove the mist adhered to the eliminator.
The method according to claim 1,
A first discharge pipe and a second discharge pipe each having a guide line formed on an upper surface thereof for guiding the mist falling from the elevator to the outside and the other end passing through the side surface of the absorption tower; Further comprising a first discharge valve and a second discharge valve respectively coupled to the other ends of the first and second discharge pipes so as to control the discharge of the mist sliding along the first and second discharge pipes to the outside of the absorption tower,
Wherein the first and second discharge pipes are tightened downwardly in the direction of the first and second discharge valves so that the mist can slide in one direction.
The method of claim 5,
The guide blade portion includes a first blade, a second blade, a third blade, and a fourth blade which are rotatably coupled through both side surfaces of the absorption tower, a first sprocket coupled to one end of the first to fourth blades, A second sprocket, a third sprocket and a fourth sprocket, and a first motor and a second motor respectively fastened to one ends of the first blade and the third blade,
Wherein the first blade and the second blade are disposed on both upper ends of the first discharge pipe so as to be vertically spaced apart from each other in the longitudinal direction of the absorption tower and the third blade and the fourth blade are disposed on both upper ends of the second discharge pipe, Wherein the first sprocket is coupled to the second sprocket and the third sprocket is coupled to the fourth sprocket so that the first and second sprockets are coupled to each other when the first and second motors are rotated, Wherein the first and second sprockets and the third and fourth sprockets rotate in opposite directions to each other.
The method according to any one of claims 4 to 6,
Wherein the control unit operates the first and second injection valves when the value of the differential pressure gauge is higher than the set value and controls the first and second blades so that the upper gap between the first blade and the second blade becomes wider, And the second motor is operated so that the upper gap between the third blade and the fourth blade becomes wider and the gap between the lower blade and the fourth blade becomes narrower while simultaneously opening the first and second discharge valves , Absorption tower eliminator clogging prevention device.

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