KR100998853B1 - The waste gas scrubber - Google Patents

Abstract

The present invention relates to a waste gas treatment apparatus, and more particularly, to design a baffle board and a filler having a horizontally separable structure to facilitate washing of powders and by-products adsorbed in the filler, and to extend the waste gas passage area by contacting waste gas and The present invention relates to a waste gas treating apparatus which improves the treatment efficiency of waste gas by increasing the contact time.

The waste gas treating apparatus of the present invention includes an integrated waste gas treating apparatus comprising: a heating chamber configured to burn or thermally decompose waste gas introduced from a gas inlet into powder; A wet chamber connected to the heating chamber and having a plurality of baffle boards formed horizontally separable in a flow path of powder and waste gas passing through the heating chamber and a filler filled between the baffle boards; And a drain tank positioned below the heating chamber and the wet chamber to collect and treat waste water in which powder or waste gas dissolved while passing through the heating chamber or the wet chamber is dissolved, and the filler is made of polypropylene or teflon. There are technical features.

Waste Gas Treatment, Scrubber, Horizontal Separation, Baffle Board, Filler, Wet

Description

Waste gas scrubber

The present invention relates to a waste gas treatment apparatus, and more particularly, to design a baffle board and a filler having a horizontally separable structure to facilitate washing of powders and by-products adsorbed in the filler, and to extend the waste gas passage area by contacting waste gas and The present invention relates to a waste gas treating apparatus which improves the treatment efficiency of waste gas by increasing the contact time.

Semiconductor devices are manufactured through various manufacturing processes, such as oxidation, etching, deposition and photo processes. In the semiconductor manufacturing process, various kinds of toxic chemicals and chemical gases are used as reaction gases, and the reaction gases have an oxidizing component, a ignition component, and a toxic component.

Therefore, waste gases containing gaseous toxic substances represented by arsine, phosphine, diborane, monosilane, ammonia, nitrogen oxide, boron trichloride, etc. are generated at various stages of the semiconductor manufacturing process.

These toxic waste gases are highly toxic and if released into the atmosphere after being used in the process, are not only harmful to the human body but also cause environmental pollution. There is also the possibility of a fire resulting from spontaneous ignition. Therefore, these waste gases must be completely removed from the toxic substances contained in the waste gas before being released into the atmosphere.

Accordingly, various types of gas scrubbers are installed in the exhaust line of semiconductor equipment to remove harmful waste gases and discharge them to the atmosphere, and gas scrubbers are classified into a wet method and a dry method. .

The wet scrubber is a structure that collects waste gas by using water, and then cleans and cools it. However, the water-insoluble gas is impossible to treat, and is particularly inadequate for the treatment of waste gas containing a highly flammable hydrogen group.

The dry scrubber has a structure in which a waste gas passes through the burner to be directly burned, or a heat source is used to form a high temperature chamber and indirectly burned by passing the waste gas into the burner. Such dry scrubbers have an excellent effect on the treatment of flammable (flammable) gases, but are inadequate for the treatment of gases that do not burn well, such as water soluble gases.

Accordingly, a mixed gas scrubber combining wet and dry scrubbers is being used.

The mixed gas scrubber first has a structure in which waste gas is first combusted in a combustion chamber to remove ignition gas and explosive gas, and then secondarily contained in a water tank to dissolve water-soluble toxic waste gas in water.

As such a gas scrubber, Korean Patent Publication No. 2006-66299 "Waste Gas Treatment Device" is known.

1 is a view showing a conventional mixed gas scrubber.

The waste gas treatment device includes a dry unit 10 including a burner 11, a manifold 12, and a burning chamber 13, a purification / cooling unit 21, a condensation unit 22, and a water treatment tower 23. It includes a wet unit (20).

The vertical dry unit 10 and the vertical wet unit 20 separated from each other are connected to each other by a connection pipe.

However, the conventional gas scrubber has the disadvantage that corrosion of components in the apparatus by waste gas occurs and frequent maintenance is required as a large amount of powder is generated at a part contacting with water through the burning chamber. . Frequent maintenance of such gas scrubbers causes significant downtime of the main process equipment that emits exhaust gases, which is quite disadvantageous in terms of productivity.

In addition, there is a problem of corrosion of the exhaust pipe at the site where the water molecules bonded to the waste gas by the chemical bonding upon contact with the water, and thus requires an expensive exhaust pipe having corrosion resistance, which is uneconomical. In addition, since the gas scrubber is not integrated and must be installed in a small area, the size is limited and there is a limitation in processing a large amount of waste gas at one time.

In addition, as the powder is attached to the filler of the wet unit to prevent the voids to significantly reduce the purification function, because the need to remove the filler from the above, there is a difficulty in cleaning the detachable.

Therefore, there is still a need to prevent the deposition of powders in conventional gas scrubbers and to improve the water treatment efficiency.

The present invention devised to solve the problems of the prior art as described above can be easily taken out by installing the baffle board and the filler of the horizontally detachable structure, it is easy to clean the powder and impurities adsorbed in the filler, easy maintenance The purpose is to provide a waste gas treatment apparatus capable of.

In addition, an object of the present invention is to provide a waste gas treatment apparatus for installing a baffle board and a filler to increase the waste gas flow path to increase the contact area and the contact time of the waste gas to improve the collection capacity of water-soluble waste gas and powder.

In addition, the present invention is provided with a combustion chamber and a solvent injection nozzle for burning waste gas into a powder to integrally design a wet chamber and a drain tank for dissolving or collecting waste gas and powder. Another object is to provide a waste gas treatment apparatus that can prevent clogging.

An object of the present invention is an integrated waste gas treating apparatus comprising: a heating chamber configured to burn or thermally decompose waste gas introduced from a gas inlet into a powder; A wet chamber connected to the heating chamber and having a plurality of baffle boards formed horizontally separable in a flow path of powder and waste gas passing through the heating chamber and a filler filled between the baffle boards; And a drain tank positioned below the heating chamber and the wet chamber to collect and treat waste water in which powder or waste gas dissolved while passing through the heating chamber or the wet chamber is dissolved, and the filler is made of polypropylene or teflon. Achieved by a waste gas treatment apparatus.

In addition, it is preferable that the heating chamber, the wet chamber and the drain tank of the present invention are integrally connected, and further comprising a housing having a waste gas inlet and an exhaust port.

In addition, the material of the housing of the present invention is preferably any one selected from PVC, platinum PVC and HT PVC.

In addition, it is preferable to further include a first spray nozzle for injecting water into the waste gas passed through the heating chamber of the present invention to purify and cool.

In addition, it is preferable to further include a second spray nozzle which is located on the top or one side of the wet chamber of the present invention to spray water or solvent.

In addition, it is preferable to further include a drying sphere having an external air inlet connected to the end of the wet chamber of the present invention to lower the relative humidity of the waste gas.

In addition, the baffle board of the present invention is preferably formed with a plurality of holes for passing the solvent.

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Therefore, the waste gas treatment apparatus of the present invention can be separated and easily taken out by installing a baffle board and a filler having a structure that can be horizontally separated, so that it is easy to clean the powder and impurities adsorbed in the filler and can be easily pre-maintained. There is a noticeable and advantageous effect.

In addition, the waste gas treatment device of the present invention is a remarkable that can increase the treatment efficiency by improving the collection capacity of the water-soluble waste gas and powder by increasing the contact area and the contact time of the waste gas by installing a baffle board and a filler to lengthen the flow path of the waste gas It has a beneficial effect.

In addition, the waste gas treatment apparatus of the present invention includes a combustion chamber and a solvent injection nozzle for burning waste gas to form a powder and integrally design a wet chamber and a drain tank for dissolving or collecting waste gas and powder. There is a remarkable and advantageous effect of preventing clogging due to accumulated powder and improving corrosion resistance.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

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

2 is a cross-sectional view showing an integrated waste gas treatment apparatus according to the present invention.

The waste gas treating apparatus according to the present invention includes a housing 500 including a heating chamber 100, a wet chamber 200, a drying unit 300, and a drain tank 400, all of which are provided by the housing 500. Connected integrally to form one device.

The material of the housing 500 of the present invention may use any one selected from PVC, platinum PVC, and HT PVC.

The heating chamber 100 of the present invention removes the flammable (combustible) gas component contained in the waste gas, and the wet chamber 200 removes the water-soluble gas component contained in the waste gas.

The heating chamber 100 of the present invention includes a gas inlet 110, a heater 120, a cooling line 130, a gas channel 140 and a partition wall 150.

The waste gas flowing from the gas inlet 110 enters the heating chamber 100 and is burned or pyrolyzed by heat emitted from the heater 120. In FIG. 2 of the present invention, the heater 120 is illustrated as a rod-shaped rod heater, but a means for applying heat is not limited thereto. Therefore, any type of burner, heater, or plasma may be selected and used.

By installing and cooling a cooling line 130 through which cooling water flows outside the heating chamber 100, it is preferable to prevent high heat inside the heating chamber 100 from being transferred to another device next to the heating chamber 100.

In addition, the partition wall 150 is installed to be spaced apart from the inner wall of the heating chamber 100 by a predetermined distance to form a gas channel 140 between the inner wall of the heating chamber 100 and the partition wall 150. By insulating the adiabatic air from the outside into the gas channel 140 to allow the adiabatic air to flow, the heat emitted from the heater 120 can be prevented from going out of the heating chamber 100, and thus, adiabatic effect can be expected. The corrosive waste gas may be prevented from contacting the inner wall of the heating chamber 100 so that the inner wall of the heating chamber may be corroded to prevent leakage of cooling water.

The partition wall 150 is preferably made of stainless (SUS) material.

In addition, the circulating water supply means 160 is designed in the lower portion of the heating chamber 100 to inject the circulating water from the outside to form a swirl flow. Through this, the high temperature waste gas which has undergone the high temperature pyrolysis reaction in the heating chamber is quenched with circulating water to lower the temperature of the waste gas below 100 ° C. In addition, the circulating water uniformly forms a water protective film to prevent corrosion and to prevent agglomeration of powder. Therefore, the treatment efficiency can be increased by concentrating the aqueous waste gas.

Pyrolytic gases include H ₂ , SiH ₄ , O ₃ , TEOS [(C ₂ H ₅ O) ₄ Si], TEB [B (C ₂ H ₅ ) ₃ ], TEPO [P (OC ₂ H ₅ ) ₃ ], TiCl ₄ , TDMAT (Ti [N (CH ₃ ) ₂ ] ₄ ), TCE (C ₂ HCl ₃ ), DCS (SiH ₂ Cl ₂ ), NH ₃ , NF ₃ , NO, N ₂ O, PH ₃ , WF ₆ , AsH ₃ , As, VOCs and the like. In addition, the gas which can be burned by LPG or LNG includes NF ₃ , CF ₄ , C ₂ F ₆ , C ₃ F ₈ , CHF ₃ , SF ₆ , VOCs (Volatile organic compounds). This pyrolytic or combustible flammable gas is mainly removed while passing through the heating chamber.

Aqueous gases include HCl, DCS (SiH ₂ Cl ₂ ), NH ₃ , ClF ₃ , SiF ₄ , F ₂ , HF, SiCl ₄ , WF ₆ , TiCl ₄ , NH ₄ Cl, TDMAT (Ti [N (CH ₃ ) _{2 4} ), AlCl ₃ , Cl ₂ , TCA (C ₁₀ H ₄ Cl ₆ O ₄ ), BCl ₃ , HBr, SO ₂ , B, BF ₃ , TEOS ((C ₂ H ₅ O) ₄ Si), TiF ₄ And such water-soluble gas is mainly removed while passing through the wet chamber.

While passing through the heating chamber 100, the ignitable gas component in the waste gas is burned or pyrolyzed by heat to form powder.

The wet chamber 200 of the present invention is divided into a plurality of areas by a partition of a predetermined size, and includes a first spray nozzle 210, a baffle board 220, a filler 230, and a second spray nozzle 240. do.

The powder and the water-soluble waste gas which are not decomposed in the heat formed through the heating chamber 100 are subjected to the purification and cooling process once more while passing through the first spray nozzle 210 located on one side of the lower portion of the heating chamber 100. At this time, the powder is collected and purified in the fine water particles injected from the first spray nozzle 210, the water-soluble waste gas is also dissolved in the water particles and flows into the drain tank (400). In this process, most of the powder is removed, and only the predetermined waste gas remaining without dissolving in the water injected from the first spray nozzle 210 goes through the next step of treatment.

The predetermined waste gas passing through the first spray nozzle 210 is processed while passing through the wet chamber 200 formed by partitioning into a plurality of regions. At this time, the waste gas is mainly soluble gas components.

The wet chamber 200 is divided into a plurality of regions by partitions, and baffle boards 220 and fillers 230 are installed at predetermined positions of the regions to increase the processing efficiency by extending the movement path of the waste gas.

In addition, a second spray nozzle 240 is installed on the upper side or one side of the wet chamber 200. The second spray nozzle 240 sprays water or a solvent to collect or dissolve the water-soluble waste gas and to treat it.

The baffle board 220 is designed in a drawer type structure, which can be separated horizontally, and can be easily pulled out and placed, so that it is easy to manage prior maintenance. In addition, the baffle board 220 is installed in multiple to lengthen the flow path of the waste gas, it is preferable that a plurality of holes for passing water or a solvent is formed.

The filler 230 is packaged and filled in the horizontally detachable baffle board 220. The filler 230 is a porous material having a plurality of holes formed therein. The material of the filler is made of polypropylene or teflon, and most preferably made of teflon in order to prevent corrosion by corrosive gas.

In addition, the filler 230 may be formed as a spherical, cylindrical, tetrahedral, hexahedral, octahedral, icosahedral, etc. having a size of about several mm to several cm as a polyhedral structure, but is not limited in size or shape.

Since the water or solvent injected from the water-soluble waste gas and the second spray nozzle 240 passes through the hole of the filler 230, the contact area and the contact time of the water-soluble waste gas and the solvent are increased, so that the capturing ability of the water-soluble waste gas and powder is increased. Is improved. In order to increase the contact area between the solvent and the waste gas, it is preferable to package and install hundreds of fillers 230.

Due to the structure of the baffle board 220 and the filler 230, the high flow rate and high efficiency water treatment is possible by extending the flow path of the waste gas.

In the wet gas treatment process, powder and other suspended substances are adsorbed into the space inside the filler 230 to be contaminated, and the holes are clogged so that the efficiency of gas treatment decreases, thus requiring periodic cleaning. In this case, conventionally, disassembling the equipment after taking the filler from the top to wash it was not easy to wash, but in the present invention, by designing the separation of the baffle board 220 horizontally, do not disassemble the equipment to take out and put It can be easily done without the advantage of more convenient to wash.

In the wet chamber 200 of the present invention, as shown in FIG. 2, the plurality of regions may be arranged in parallel rather than in series to increase the flow path of the waste gas without increasing the volume of the equipment.

In addition, the inner wall of the wet chamber 200 is preferably coated with Teflon to prevent corrosion.

In addition, the floating device may be further installed so that the powder is concentrated on the inner wall of the wet chamber 200.

As described above, since the waste gas introduced through the gas inlet 110 passes through the heating chamber 100 and the wet chamber 200 and undergoes a purification process, most of the waste gas is removed and only a small amount of the purified waste gas is removed. Exit to this exhaust port.

At this time, the waste gas exiting the exhaust port is in a high humidity state by water or solvent injected from the first spray nozzle 210 or the second spray nozzle 240. This high-humidity waste gas condenses around the exhaust port, forming water, which corrodes the exhaust port.

In order to prevent this phenomenon, an external air inlet 310 may be formed in front of the exhaust port so as to introduce external air, thereby lowering the relative humidity by introducing dry outside air. This process occurs in the drying unit 300 of the present invention.

That is, the drying unit 300 of the present invention prevents the condensation of the exhaust duct or the pipe by corrosive waste gas by supplying external air to the gas passing through the wet chamber to prevent moisture condensation.

In addition, in case the exhaust pressure drops, a safety setting limit value is sensed and an actuator valve (not shown) that can be closed automatically is installed to prepare for a risk.

Drain tank 400 of the present invention is located in the lower portion of the heating chamber 100 and the wet chamber 200 and serves to collect and drain the waste water and powder generated as the waste gas passes through these devices. To this end, it is preferable to include a drain pump 410 and the circulation pump 420.

The drain tank 400 may be made of stainless steel, and it is preferable to coat the inner wall of the tank with Teflon to prevent corrosion.

The waste gas treatment apparatus of the present invention may simplify the unit configuring the equipment to reduce the equipment size and increase the space utilization in accordance with the semiconductor FAB environment.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

1 is a view showing a conventional mixed gas scrubber.

2 is a view showing an integrated waste gas treatment apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: heating chamber 200: wet chamber

210: first injection nozzle 220: baffle board

230: Filler 240: First spray nozzle

300: exhaust port 310: outside air inlet

400: drain tank

Claims (9)

In the integrated waste gas treatment device, A heating chamber which generates powder by burning or pyrolyzing the waste gas introduced from the gas inlet; A wet chamber connected to the heating chamber and having a plurality of baffle boards formed horizontally separable in a flow path of powder and waste gas passing through the heating chamber and a filler filled between the baffle boards; And A drain tank disposed under the heating chamber and the wet chamber to collect and treat waste water in which powder or waste gas dissolved while passing through the heating chamber or the wet chamber is dissolved; The filler is a waste gas treatment device made of polypropylene or teflon. The method of claim 1, And a housing having integrally connecting the heating chamber, the wet chamber, and the drain tank, the housing having a waste gas inlet and an exhaust port. 3. The method of claim 2, The material of the housing is any one selected from PVC, platinum PVC and HT PVC waste gas treatment device. 3. The method of claim 2, And a first spray nozzle for injecting water into the waste gas passing through the heating chamber to purify and cool the waste gas. The method of claim 4, wherein Waste gas treatment apparatus further comprises a second injection nozzle is located on the top or one side of the wet chamber to inject water or solvent. The method of claim 1, And a drying port having an external air inlet port connected to the end of the wet chamber to lower the relative humidity of the waste gas. The method of claim 1, The baffle board is waste gas treatment apparatus is formed a plurality of holes for passing the solvent. delete delete

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