KR100638517B1 - Scrubber having diffraction plate - Google Patents

Abstract

A diffraction type scrubber is provided to improve scrubbing efficiency by smoothly contacting water with a flow of odor gas or harmful gas using diffraction plates, prevent ozone from being released into the outside by dissolving ozone using the diffraction plates, and improve contact efficiency of water and odor gas by directionally spraying water containing an absorption liquid onto the diffraction plates. A diffraction type scrubber comprises: a body(10); a gas inlet(11) through which harmful gas flows into the body by operation of a blower, and which is formed on a lower portion of the body; a packing layer(20) filled with packings for contacting the harmful gas with water containing an absorption liquid; a circulation pump(14) for circulating the water to a circulation pipe through a drain pipe(13) connected to a lower portion of the body; a first diffraction plate(31a) which is installed on an upper part of the packing layer, on which projections are radially formed to emit the harmful gas, and in which two diffraction plates are spaced from each other in a certain gap; a first water spray pipe(16a) which is installed in an upper part of the first diffraction plate, and on which spray nozzles(35) are formed to spray water supplied from the circulation pipe(15) onto an upper portion of the first diffraction plate; a first water overflow pipe(33a) installed in a central part of the body to drain water collected on an upper part of the first diffraction plate to a lower part of the body; and a demister(40) installed on a lower part of a gas outlet(12) to separate mist passing through the packing layer.

Description

Diffraction Scrubber {Scrubber having Diffraction Plate}

1 is a cross-sectional view showing an embodiment of a conventional scrubber.

2 is a cross-sectional view of the diffractive scrubber according to the present invention.

3 is a plan view of a diffraction plate of the present invention.

4 is an enlarged view of portion E of FIG. 3, and FIG. 4A is a plan view of the protrusion, and FIG. 4B is a front view.

FIG. 5 is a cross-sectional view taken along the line AA ′ of FIG. 2.

FIG. 6 is an enlarged view illustrating an enlarged portion B of FIG. 2.

7 is a cross-sectional view showing an embodiment in which an ozone generator and a recoverer are installed in a scrubber according to the present invention.

* Brief description of the major symbols in the drawings *

10: main body 11: gas inlet

12: gas outlet 13: drainage pipe

14: circulation pump 15: circulation pipe

16a, 16b, 16c: water spray pipe 20: packing layer

31a: first diffraction plate 31b: second diffraction plate

31 ': protrusion 32: mesh

33: water pipe 34: tank

35: injection nozzle 40: demister

51: ozone generator 52: ozone inlet

53: ozone recoverer

Field of invention

The present invention relates to a scrubber that is a odor gas or harmful gas purification device. More specifically, the present invention relates to a scrubber capable of dissolving ozone by providing a diffraction plate in the scrubber and improving the purifying performance of odor gas or harmful gas.

Background of the Invention

According to the Tokyo Protocol on the Environment of the Ozone Layer, all industrial exhaust gases are legislated to purify and discharge PFC gas, which is supported by the Korea Environmental Protection Act. Therefore, if you do not comply with these environmental certifications, there is a risk of legal and economic disadvantages, so it is essential to have a toxic gas purification system in all industrial sites.

Types of air pollution prevention facilities currently used by industry include dust collectors, adsorption towers and scrubbers. Each of them is installed in consideration of the efficiency according to the type of contaminants. Among them, scrubbers (scrubber) are widely used because they have the advantage that can simultaneously process dust and harmful gases, and hot gases.

In general, scrubbers are also known as gas absorption towers, and are classified into dry, wet and burnwet depending on the contaminant treatment method. The wet scrubber consists of a process of contacting a noxious gas to a liquid and dissolving the soluble components in the gas in the liquid phase. Wet scrubbers have low maintenance costs, can remove dust, mist and various air pollutants at the same time, and can also be used for distillation and humidification. Has

In wet scrubbers, absorbents are typically used to make the removal of contaminants more efficient. Absorbent removes pollutants through chemical reactions such as neutralization in contact with pollutants and water. For high efficiency, absorbents should be selected for the best chemical reaction.

The performance of a wet scrubber is determined by how efficiently the contact of water with these absorbent liquids and harmful gases can be achieved. Therefore, in the past, a filling nozzle was used or a spray nozzle was installed to supply water having a small particle so that the water including the absorbent liquid and the harmful gas were sufficiently in contact with each other.

1 is a cross-sectional view showing an embodiment of a conventional scrubber. In general, the scrubber is a main body (1), an inlet (2) where harmful gas enters, a blower (3) for sending contaminants to the inlet of the scrubber, a packed layer (4) filled with a filler to contact the harmful gas and the absorbent liquid, and the absorbent liquid Circulation pump (5) for supplying water, spray nozzle (6) for dispersing and supplying water, including absorbent liquid, demister (7) for separating mist passing through a packed bed, and for purifying purified gas It consists of an outlet 8. Noxious gas is injected into the main body through the inlet of the main body by the blower. The injected gas rises, and sprays water containing an absorbent liquid into the main body through a spray nozzle to remove contaminants, and passes through a packed bed filled with a filler to maximize contact between the gas and water. . Contaminants in the gas are cleaned by droplets, liquid film, bubbles, etc. by the packed bed, and when fine dust is filtered through the demister, the finally purified gas is discharged into the atmosphere through the outlet.

However, this method alone has a problem that the contaminant is not effectively removed because the contact of water and harmful gases cannot occur smoothly. In fact, the scrubber's processing efficiency is about 60% of the design value. In addition, if the filling layer or spray nozzle is further increased to remove contaminants more efficiently, the size of the scrubber increases, which causes the difficulty of installation and increase the maintenance cost.

In order to solve this problem, the present inventors have come to develop a diffraction type scrubber that improves the purification efficiency by installing a rotary plate capable of maximizing contact between the water containing the absorbing liquid and odorous gas or harmful gas and dissolving ozone.

It is an object of the present invention to provide a diffractive scrubber.

It is another object of the present invention to provide a scrubber having increased purification efficiency by facilitating contact between the flow of odor gas or harmful gas and water using a diffraction plate.

Still another object of the present invention is to provide a scrubber which does not emit ozone by dissolving ozone using a diffraction plate.

It is still another object of the present invention to provide a diffraction type scrubber which gives a change in the advancing direction of odor gas by giving a direction when injecting water containing an absorbent liquid into the diffraction plate, thereby increasing the contact efficiency of water and odor gas. .

The above and other objects of the present invention can be achieved by the present invention described below.

Summary of the Invention

The diffraction scrubber according to the present invention includes a main body 10; Noxious gas is introduced into the main body by the operation of the blower and the gas inlet 11 formed in the lower portion of the main body; A packing layer 20 filled with a filler to contact the harmful gas and the water including the absorbent liquid with each other; A circulation pump 14 for circulating the water into a circulation pipe through a drain pipe 13 connected to the lower part of the main body; A first diffraction plate 31a disposed above the packing layer and having a protrusion 31 'through which the noxious gas escapes in a radial direction, and having two diffraction plates spaced at predetermined intervals; A first water spray pipe 16a provided above the first diffraction plate portion and having a spray nozzle 35 for spraying water supplied from the circulation pipe 15 to the top of the first diffraction plate. ; A first tumble tube (33a) installed at the center of the main body and configured to drain water accumulated in the upper portion of the first diffraction plate to the lower portion of the main body; And a demister 40 which separates the mist passing through the packed bed and is installed under the gas outlet 12.

In the present invention, the first mesh 32a may be provided on the upper portion of the first water overflow pipe.

In addition, the diffraction scrubber according to the present invention may further include another diffraction plate in order to increase the purification efficiency, the projection is installed on the upper portion of the first water spray pipe (16a) and the harmful gas escapes in the radial direction A second diffraction plate 31b formed of two diffraction plates provided at two predetermined intervals; A second water spray pipe (16b) disposed above the second diffraction plate, and having a spray nozzle configured to spray water supplied from the circulation pipe (15) to the top of the second diffraction plate; A second tumble tube (33b) installed at the center of the main body and configured to drain water accumulated on the second diffraction plate to both sides of the main body; And a water tank 34 installed at a lower portion of the second overflow tube and temporarily storing water flowing down from the second overflow tube.

Also in the case of the second diffraction plate, the second mesh 32b may be further provided on the upper portion of the second water overflow pipe similarly to the case of the first diffraction plate.

On the other hand, the third water is provided on the lower portion of the first diffraction plate and the upper portion of the packing layer to directly spray water to the packing layer and the third water for spraying water supplied from the circulation pipe 15 to the upper portion of the packing layer. The injection pipe 16c may be provided.

The diffractive scrubber according to the present invention is provided at the lower portion of the ozone inlet 52 and the gas outlet 12 for supplying ozone generated from the ozone generator 51 to the gas inlet 11 into the main body 10. It may further include an ozone recoverer 53 for recovering the ozone.

Hereinafter, with reference to the accompanying drawings, the contents of the present invention will be described in detail.

Detailed Description of the Invention

2 is a cross-sectional view of the diffractive scrubber according to the present invention.

As shown in FIG. 2, the present invention includes a main body 10, a gas inlet 11, a gas outlet 12, a drain pipe 13, a circulation pump 14, a circulation pipe 15, and a first water spray. It consists of the pipe 16a, the 1st diffraction plate 31a, and the 1st water overflow pipe 33a.

The absorbent liquid contained in the water used for the scrubber according to the present invention is used by selecting an appropriate one among the well known absorbent liquids according to various contaminants. For example, harmful gas containing hydrogen chloride (HCl) (hereinafter referred to as "harmful gas" includes all harmful gases, odor gases, etc.) is to be treated by a washing tower treated with an alkali absorbing liquid and the reaction formula Is as follows.

[Formula 1]

HCl + NaOH (absorbent) → NaCl + H ₂ O

In the present invention, the main body 10 is typically made of F.R.P, glass-fiber (fiber-glass) as a main reinforcing material, and processed to a unsaturated polyester resin, epoxy resin, etc. to have a strong corrosion resistance, heat resistance, durability.

In order to flow harmful gas to the water inlet 11, a separate blower (not shown) is used. In the present invention, a blower is used depending on the air volume in addition to the blower, or an ID (Induced Draft) according to the system. Fan System or FD (Forced Draft) Fan System can be selected.

In the present invention, the packing layer 20 refers to a place where water including harmful gas and absorbent liquid comes into contact with each other. Absorbing most of the harmful gas flowing into the main body 10 through the gas inlet 11 is an absorbent liquid, so the contact area between the harmful gas and the water including the absorbent liquid must be increased for efficient absorption. In this case, the packing is used, and the packing layer is conventionally used, and may be used by filling various types of packing materials. Preferably, the packing material disclosed in Korean Patent No. 519986 may be used. These packing materials are selected in consideration of price, low pressure loss, corrosion resistance, large specific surface area, structural strength, weight, and the like. Fillers are generally installed at a height of 500 mm and the distance between the spray nozzle and the filling layer is generally about 500 mm.

In the present invention, in addition to contacting the water supplied from the first water injection pipe 16a and the noxious gas in the packing layer 20 as described above, a first diffraction plate 31a is further provided to provide water and noxious gas. The contact efficiency is increased.

The first diffraction plate 31a has a form as shown in FIG. 3. Numerous protrusions 31 'are formed in the diffraction plate in the radial direction, and two diffraction plates are spaced apart at predetermined intervals as shown in the cross-sectional view of FIG. As for the space | interval spaced apart, about 1 cm-5 cm are preferable normally. Holes are formed in each of the protrusions 31 'of the diffraction plate so that noxious gas flows out. Hazardous gases emerge from this hole and impinge on the circumferential portion of the hole, increasing the contact time with water as it passes between the two diffraction plates. In addition, ozone is generally not dissolved in water, but pressure is generated due to diffraction of the diffraction plate, thereby increasing the solubility of ozone, thereby facilitating ozone recovery, and not emitting ozone to the outside.

The enlarged portion E of FIG. 3 is shown in FIGS. 4A and 4B to enlarge the projection 31 'of the diffraction plate. 4A is a plan view of the protrusion, and FIG. 4B is a front view. As shown in FIG. 4B, holes are formed in each of the protrusions, and are designed to escape harmful gases. In the first diffraction plate having two diffraction plates formed at predetermined intervals, the contact efficiency with water is increased because noxious gas is diffracted through the holes through each of these protrusions.

Further, in the present invention, the first water injection pipe 16a for supplying water in contact with the noxious gas exiting the first diffraction plate 31a is provided on the upper part of the first diffraction plate. In addition, as shown in FIG. 5, the direction in which water is sprayed from the first water spray pipe 16a is preferably formed in the spray nozzle 35 to face in the opposite direction when viewed based on the horizontal diameter. In this way, the gas flow is rotated in a constant direction on the top of the diffraction plate, so that the contact time between the water and the noxious gas is increased and the purification efficiency is improved.

On the other hand, when water is injected from the first water spray pipe and accumulates in the upper portion of the first diffraction plate, it flows down to the lower portion of the main body through the first water overflow pipe 33a. Water is discharged through the drain pipe 13 in the lower part of the main body, and water is again supplied to the water spray pipe through the circulation pipe by the circulation pump 14. At this time, the filtration device may be further provided before and after the circulation pump. In addition, the first mesh 32a may be provided on the first water overflow pipe 33a to have a filtration function.

The diffraction scrubber according to the present invention can be configured by further providing a second diffraction plate 31b in addition to the above-described first diffraction plate 31a. The specific form and structure of a 2nd diffraction plate are the same as that of a 1st diffraction plate. However, the first water spray pipe (16a) is provided on the upper portion, the second water overflow pipe (33b) is configured to flow water to both sides of the main body (10). The water tank 34 is provided in the lower both sides of the said 2nd water overflow pipe 33b, and when water fills this water tank 34, it overflows and flows to the upper part of a 1st diffraction plate. In addition, a second water spray pipe 16b is installed on the second diffraction plate to spray water onto the second diffraction plate.

FIG. 6 is an enlarged view of the center of which the second diffraction plate is installed, and shows an enlarged portion B of FIG. 2. As shown in FIG. 6, the water sprayed from the second water spray pipe 16b is in efficient contact with the harmful gas diffracted through the second diffraction plate 31b, and overflows with time to flow the second water overflow pipe. It flows to the lower part of the main body through 33b. In addition, as in the case of the first overflow tube 33a, a second mesh 32b may be installed on the upper portion of the second overflow tube 33b to have a filtration function.

Meanwhile, in the present invention, the third water spray pipe 16c may be installed on the top of the packing layer so that water is directly injected from the top of the packing layer 20 so that large particles such as dust are treated in the packing layer.

As such, the noxious gas in contact with water at the top of the second diffraction plate continues to rise to contact the demister 40. Here, the liquid component is removed and the purified gas gas is then discharged to the outside through the gas outlet 12.

As described above, the present invention increases the purification efficiency of the harmful gas by smoothly contacting the harmful gas diffracted through the diffraction plate in addition to the packing layer and water sprayed efficiently through the water injection pipe.

7 is a cross-sectional view showing an embodiment in which an ozone generator and a recoverer are installed in a diffraction scrubber according to the present invention.

As illustrated in FIG. 7, when harmful gas is introduced into the main body 10 through a blower (not shown), ozone may be introduced into the main body to further increase the purification efficiency of the harmful gas. Specifically, the ozone inlet 52 is installed in the gas inlet 11 to supply ozone generated from the ozone generator 51 into the main body 10 and circulate inside the main body 10. After the ozone is dissolved by the pressure formed by the diffraction plate, the ozone recoverer 53 is installed at the lower portion of the gas outlet 12 before being discharged to the gas outlet 12 so that ozone is not discharged to the outside. A separate ozone decomposing device (not shown) may be installed in the ozone recoverer 53 to decompose the recovered ozone and discharge it to the outside, or may be configured to circulate to the ozone inlet 11 again.

The present invention improves the purification efficiency by smoothly contacting the flow of malodorous gas or noxious gas and water by using a diffraction plate, and gives a direction when spraying water containing absorbent liquid onto the diffraction plate, thereby giving a direction of advancing malodorous gas. The effect of the invention is to provide a diffractive scrubber that is changed to increase the contact efficiency of water and odor gas.

Simple modifications and variations of the present invention can be readily used by those skilled in the art, and all such variations or modifications can be considered to be included within the scope of the present invention.

Claims (7)

Main body 10; Noxious gas is introduced into the main body by the operation of the blower and the gas inlet 11 formed in the lower portion of the main body; A packing layer 20 filled with a filler to contact the harmful gas and the water including the absorbent liquid with each other; A circulation pump 14 for circulating the water into a circulation pipe through a drain pipe 13 connected to the lower part of the main body; A first diffraction plate 31a disposed above the packing layer and having a protrusion 31 'through which the noxious gas escapes in a radial direction, and having two diffraction plates spaced at predetermined intervals; A first water spray pipe 16a provided on an upper portion of the first diffraction plate and having a spray nozzle 35 for spraying water supplied from the circulation pipe 15 to the upper portion of the first diffraction plate. ; A first tumble tube (33a) installed at the center of the main body and configured to drain water accumulated in the upper portion of the first diffraction plate to the lower portion of the main body; And A demister 40 which separates the mist passing through the packed bed and is installed under the gas outlet 12; Diffractive scrubber, characterized in that consisting of. The diffractive scrubber according to claim 1, further comprising a first mesh (32a) provided on an upper portion of the first overflow tube. The method of claim 1, A second diffraction plate 31b disposed above the first water injection pipe 16a and having a projection portion through which the noxious gas escapes in a radial direction, wherein two diffraction plates are provided at predetermined intervals; A second water spray pipe (16b) disposed above the second diffraction plate, and having a spray nozzle configured to spray water supplied from the circulation pipe (15) to the top of the second diffraction plate; A second tumble tube (33b) installed at the center of the main body and configured to drain water accumulated on the second diffraction plate to both sides of the main body; And A water tank (34) installed at a lower portion of the second water overflow pipe for temporarily storing water flowing out of the second water overflow pipe; Diffraction-type scrubber, characterized in that further comprises. 4. The diffractive scrubber according to claim 3, further comprising a second mesh (32b) provided on an upper portion of the second water overflow pipe. The third water spray according to claim 1, wherein the third water spray is provided at a lower portion of the first diffraction plate and an upper portion of the packing layer, and sprays water supplied from the circulation pipe 15 to the upper portion of the packing layer. And a pipe (16c) further comprises a diffractive scrubber. 5. The gas inlet of claim 1, wherein the ozone inlet port 52 and the gas outlet port 12 supply the ozone generated from the ozone generator 51 to the gas inlet 11. And an ozone recoverer (53) for recovering the ozone from the bottom. The ozone inlet 52 and the lower portion of the gas outlet 12 for supplying ozone generated from the ozone generator 51 to the gas inlet 11 to the body 10. Diffractive scrubber, characterized in that it further comprises an ozone recoverer (53) for recovering.

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