KR100786638B1 - Method and apparatus for treating exhaust gas in order to prevent generation of white smoke - Google Patents

Abstract

The present invention relates to a method and apparatus for treating exhaust gas, and more particularly, to a method and apparatus for treating exhaust gas, which can prevent generation of white smoke during discharge of exhaust gas.

Exhaust gas treatment method for preventing the generation of white smoke by one side of the present invention uses the principle that the rainfall is formed in the warm cloud as described above. Exhaust gas treatment method for preventing the generation of white smoke according to the present invention is a process of spraying a hydrophilic alkali solution to form a cloud core in the exhaust gas firstly, and a low temperature in the exhaust gas containing a cloud core made of a second hydrophilic material By supplying the outside air of the condensed fine water droplets collide and collide with the cloud nucleus to grow and fall into large raindrops. An exhaust gas treatment apparatus for implementing the above method includes a wet purification chamber and an outdoor air mixing chamber. Spray the alkali solution to the exhaust gas passing through the inside of the wet purification chamber, and supply the low-temperature external air to the exhaust gas passing through the outside air mixing chamber so that water vapor falls into the droplets.

Hydrophilic, Cloud Core, Caustic Soda, Condensing Vapor, Collision, Agglomeration

Description

METHOD AND APPARATUS FOR TREATING EXHAUST GAS IN ORDER TO PREVENT GENERATION OF WHITE SMOKE}

1 is a schematic diagram of one embodiment of an exhaust gas treating apparatus according to the present invention;

2 is a schematic view of another embodiment of the exhaust gas treating apparatus according to the present invention;

Figure 3 is a perspective view of one embodiment of the eliminator used in the exhaust gas treatment apparatus according to the present invention

4 is a schematic view of a conventional smoke prevention apparatus

<Short description of drawing symbols>

10 Purification Chamber 11 Eliminator

20 sump 80 caustic soda reservoir

81 ph sensor 90 1st blower

95 2nd blower 96 Outdoor mixing chamber

98 chimneys

The present invention relates to a method and apparatus for treating exhaust gas, and more particularly, to a method and apparatus for treating exhaust gas, which can prevent generation of white smoke during discharge of exhaust gas.

When the exhaust gas mixed with water is discharged to the outside through the chimney, as the water is mixed with the atmosphere, the temperature is lowered and condensation is discharged in the form of fine droplets, the white smoke phenomenon appears to be discharged into the chimney. There is no legal restriction on the white smoke, but water and oxides in the exhaust gas react to corrode the chimney, or droplets containing acidic substances or by-products that have been neutralized may fall below the chimney, damaging the surrounding buildings or vehicles. Or it may have a harmful effect on the human body. In addition, when a large amount of white smoke is emitted, it may damage the aesthetics of the city, causing complaints.

In order to prevent white smoke, a method of discharging exhaust gas through a heat exchanger before discharge to the atmosphere is known. 4 is a schematic view of a smoke prevention apparatus using a conventional heat exchange method. The conventional smoke prevention apparatus is discharged to the chimney 130 after removing the moisture by passing the exhaust gas containing a large amount of water flowing into the duct 10 through the heat exchanger (100). The heat exchanger 100 is provided with a plurality of heat exchange pipes 111, exhaust gas flows into the heat exchange pipes 111, and cold air sucked from the outside to the outside of the heat exchange pipes 111. Is supposed to flow. Therefore, the water contained in the exhaust gas is cooled on the inner surface of the pipe where the heat exchange pipe is cooled by the cold air flowing outside the heat exchange pipe 111 and the hot exhaust gas flowing inside the heat exchange pipe 111 contacts. This condensation results in condensation and falls down the heat exchanger by gravity through the pipe. The condensed water which has fallen is discharged through the pipe 112 at the bottom of the heat exchanger. Reference numeral 120 provides a power to discharge the exhaust gas to the chimney 130 as a blower. The outside air warmed through the heat exchanger is joined with the pipe 121 of the exhaust gas through the pipe 115 and discharged through the chimney. And install a separate blower 140 for blowing air to the heat exchanger (100).

In addition, as a method of preventing the generation of white smoke from the exhaust gas, there is a method of simply mixing a large amount of external air into the exhaust gas and discharged to the chimney.

The apparatus for preventing white smoke generation using the heat exchanger as described above has a problem in that a sufficient amount of water cannot be removed due to low heat transfer efficiency of the heat exchange pipe, and the efficiency decreases rapidly when some of the plurality of heat exchange pipes are corroded or contaminated. However, there is a disadvantage that the installation and maintenance of the heat exchanger is expensive.

In addition, the method of simply mixing a large amount of external air with the exhaust gas is not a method of removing moisture contained in the exhaust gas, but a method of lowering absolute humidity to prevent condensation when it is discharged to the atmosphere. If the amount of moisture is large, a large blower is required and there is a problem in that it is not economical because the power consumption is large.

It is an object of the present invention to provide a method and apparatus for removing moisture contained in exhaust gas from a completely new point of view. Method and apparatus for removing water from the exhaust gas according to the present invention uses the principle of removing water by artificially forming rainfall in the exhaust gas containing water.

Known rainfall formation is a collision and aggregation process between cloud particles at temperatures above 0 degrees Celsius. In warm clouds, precipitation occurs without ice crystals when water vapor condenses around the macronucleus (especially sea salt particles) of aerosols, not only the water droplets are large at the beginning, but also water droplets with sea salt particles as nuclei are condensation of water vapor. This is because the water droplets grow larger because it is more active. The larger droplets have more opportunities to move relative to the surrounding droplets through atmospheric turbulence, causing them to rapidly grow and fall when the size of the raindrops drops through collision and flocculation with the droplets. Giant nuclei are mostly sea salt particles that occur in the sea, and the number of sea salt particles is determined by the condition of the sea level that is dissolved by the wind. Artificial rains in warm clouds are sprayed with hydrophilic substances such as macronucleus and salt powder in the cloud to produce relatively large droplets from the beginning, or by spraying water droplets comparable to raindrops from the beginning, causing a lot of precipitation.

Exhaust gas treatment method for preventing the generation of white smoke by one side of the present invention uses the principle that the rainfall is formed in the warm cloud as described above. Exhaust gas treatment method for preventing the generation of white smoke according to the present invention is a process of spraying a hydrophilic alkali solution to form a cloud core in the exhaust gas firstly, and a low temperature in the exhaust gas containing a cloud core made of a second hydrophilic material By supplying the outside air of the condensed fine water droplets collide and collide with the cloud nucleus to grow and fall into large raindrops.

In the exhaust gas treatment method according to the present invention, the exhaust gas is first passed through a wet purification chamber in which the hydrophilic alkaline solution is sprayed so that the hydrophilic cloud core is formed therein. Next, while supplying the exhaust gas passing through the wet purification chamber to the first inlet of the outside air mixing chamber, while supplying the outside air of lower temperature than the exhaust gas passing through the wet purification chamber to the second inlet of the outside air mixing chamber In the state where the pressure higher than atmospheric pressure is applied to the inside of the mixing chamber, the exhaust gas and the outside air are mixed and discharged through the outlet of the outside air mixing chamber. At this time, the exhaust gas passing through the wet purification chamber and low temperature external air are mixed inside the outside air mixing chamber and condensed due to supersaturation of water vapor contained in the exhaust gas, and the condensed water vapor flows through the outside air mixing chamber. It collides with the nucleus of the cloud and aggregates to grow into large water droplets that fall inside the chamber. Therefore, when the exhaust gas is removed and the exhaust gas is discharged to the outside through the chimney, the white smoke phenomenon is prevented from occurring.

In the method of the present invention, it is preferable to use a hydrophilic alkali solution containing caustic soda (NaOH) as the hydrophilic alkali solution. Caustic soda neutralizes the exhaust gas and purifies it, at the same time producing a cloud core containing sodium ions, especially when the exhaust gas is an acid gas emitted from a facility such as an incinerator. In addition, the flow rate of the external air supplied to the second inlet of the outside air mixing chamber is determined by the moisture content and temperature of the exhaust gas and the content of caustic soda (NaOH), but is preferably at least 1 times the flow rate of the exhaust gas. Do. If the flow rate of the supplied external air is not sufficient, the exhaust gas temperature is not sufficiently lowered so that the water vapor contained in the exhaust gas does not reach the supersaturated state and thus the water vapor does not condense. In addition, the flow rate of the external air supplied to the second inlet of the outside air mixing chamber is preferably such that the average pressure inside the outside air mixing chamber is higher than atmospheric pressure. If the speed of the outside air flowing into the outside air mixing chamber is not sufficient, the condensed water vapor particles are less likely to collide with the cloud core and are discharged to the outside without condensing into huge droplets. The outside air mixing chamber may further include at least one diaphragm provided between the first inlet and the second inlet and the outlet so that the flow of the inlet gas and the external air is mixed so that the flow direction is changed and discharged to the outlet. . This is to facilitate the mixing of the exhaust gas and the outside air in the outside mixing chamber, and to increase the time to stay in the outside mixing chamber to secure the time for the condensed water vapor to collide with the cloud core and agglomerate into huge droplets. .

In the method of the present invention, the wet purification chamber has an inlet for the discharge gas flows in and an outlet for the discharge of the treated exhaust gas, and uses a drain hole formed in the upper side spaced apart from the bottom by a predetermined distance, It is preferable that the bottom surface of the mist eliminator is located below the drainage hole, and arranged so as to separate the inside of the wet purification chamber into an inlet space and an outlet space. In addition, a spray nozzle for spraying the hydrophilic alkaline solution is disposed in the inlet space of the wet purification chamber. The hydrophilic alkaline solution sprayed into the inlet space is mixed with the acidic exhaust gas to form cloud cores, and at the same time passes through the mist eliminator to remove the sprayed solution first before entering the air mixing chamber. It is for.

According to another aspect of the present invention, there is provided an exhaust gas treating apparatus for preventing white smoke generation, comprising: a wet purification chamber having an inlet for introducing exhaust gas and an outlet for allowing treated exhaust gas to flow out; and an inside of the wet purification chamber. A mist eliminator installed inside the wet purification chamber to separate the space into the inlet space and the outlet space, a spray nozzle installed inside the wet purification chamber to spray the hydrophilic alkali solution into the inlet space of the wet purification chamber, Outside air including a first inlet for introducing the exhaust gas discharged from the wet purification chamber, a second inlet for introducing external air, and an outlet connected to the chimney for discharging the exhaust gas mixed with external air It is installed upstream of the mixing chamber and the first inlet of the outside air mixing chamber to discharge the exhaust gas to the chamber through the first inlet. And a second blower installed at an upstream side of the second inlet of the outside air mixing chamber, for supplying external air to the chamber through the second inlet, and an outside air mixing chamber through the second blower. The temperature of the external air supplied to the lower temperature is lower than the exhaust gas passed through the wet purification chamber, and the flow rate of the external air supplied to the external air mixing chamber through the second blower is the exhaust gas supplied to the external air mixing chamber through the first blower. It is characterized by more than the flow rate of. In addition, the hydrophilic alkaline solution sprayed on the wet purification chamber may be an alkaline solution containing caustic soda (NaOH). In addition, in the exhaust gas treatment apparatus for preventing the generation of white smoke according to the present invention, the flow rate of the external air supplied to the outside air mixing chamber through the second blower is the exhaust gas supplied to the outside air mixing chamber through the first blower It is determined by the moisture content, the temperature and the content of caustic soda (NaOH), but it is usually preferred to be at least 1 times the flow rate of exhaust gas. The outside air mixing chamber may further include at least one diaphragm provided between the first inlet and the second inlet and the outlet so that the flow of the inlet gas and the external air is mixed so that the flow direction is changed and discharged to the outlet. . In addition, the wet purification chamber uses a drain hole formed in the upper side spaced apart from the bottom surface by a predetermined distance, the mist eliminator is installed so that the bottom surface is located below the drain hole, and passes through the wet purification chamber It is good practice to ensure that all emissions are passed through the mist eliminator.

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

1 is a schematic diagram of one embodiment of an exhaust gas treating apparatus according to the present invention, and FIG. 3 is a perspective view of one embodiment of a mist eliminator used in the exhaust gas treating apparatus according to the present invention.

The apparatus for treating exhaust gas of the embodiment shown in FIG. 1 includes a wet purification chamber 10 having an inlet 17 through which exhaust gas flows in and an outlet 12 through which the treated exhaust gas flows out, and a wet purification chamber. And an outside air mixing chamber 96 for receiving the discharged gas discharged from the 10 and mixing the outside air.

A duct 1 for supplying the exhaust gas is connected to the inlet 17 of the wet purification chamber 10, and a duct 2 for exhausting the exhaust gas is connected to the outlet 12. The wet purification chamber 10 has a drainage hole 13 formed at a side spaced apart from the inner bottom by a predetermined distance. In addition, a first blower 90 is provided between the duct 2 and the first inlet 91 of the outdoor air mixing chamber 96. The first blower 90 sucks the exhaust gas from the wet purification chamber 10 and blows the exhaust gas into the outdoor air mixing chamber 96 through the duct 3.

In addition, a mist eliminator 11 is provided inside the wet purification chamber 10. The mist eliminator 11 is installed to separate the wet purification chamber 10 into the inlet space and the outlet space, and the bottom surface of the mist eliminator 11 is located below the drain hole 13. It is supported and supported by the mounting table 14. Further, a spray nozzle 18 for spraying a hydrophilic alkaline solution is provided in the inlet space of the wet purification chamber 10. In the present embodiment, two are provided with the mist eliminator 11, the number can be appropriately adjusted as necessary. Referring to FIG. 3, the eliminator 11 includes an upper plate 11a provided with a handle, a frame 11d for accommodating a plurality of blades 11b, a lower plate 11c, an upper plate 11a, and a lower plate. It consists of the some blade 11b provided in 11c. The plurality of blades 11b are disposed vertically so that moisture or dust removed from the exhaust gas falls to the bottom surface of the wet purification chamber 10 by gravity. In addition, each braid 11b is bent to remove the fine particles by guiding the flow direction of the exhaust gas. In addition, mounting grooves 11c-1 for installing the blades 11b are formed in the upper plate 11a and the lower plate 11c.

A water collecting tank 20 for accommodating an alkali solution in which caustic soda (NaOH) is dissolved is provided in the lower portion of the wet purification chamber 10. The pump 30 supplies an alkali solution in which caustic soda dissolved in the sump is dissolved to the spray nozzle 18. The alkaline solution in which the caustic soda is dissolved is separated from the exhaust gas passing through the eliminator 11 and flows down to the bottom of the wet purification chamber 10, and is connected to the drain hole 13 of the wet purification chamber 10. It flows into the water tank through the piping 19, and overflows. The sludge that accumulates in the lower portion of the wet purification chamber 10 is discharged through a separate drain pipe 15. In addition, reference numeral 80 denotes a caustic soda storage tank, which reads the measured value of the PH sensor 81. The pump 83 is controlled using a controller (not shown) to adjust the concentration of the alkaline solution in which caustic soda in the sump 20 is dissolved.

The second inlet 92 of the outdoor air mixing chamber 96 is provided with a second blower connected to the duct 4. In the present embodiment, the second blower 95 directly sucks the outside air and supplies it to the outside air mixing chamber 96. However, the second blower 95 sucks the outside air that is cooled and supplied through a separate heat exchanger, thereby mixing the outside air chamber 96. You can also supply In the outside air mixing chamber 96, a diaphragm 99 provided to separate the first inlet 91, the second inlet 92 and the outlet 93 is provided. The diaphragm 99 is installed through the first inlet 91 and the second inlet 92 so as to change the direction of the flow of the mixed exhaust gas and external air, and a plurality of diaphragms 99 are installed to change the direction of the flow several times. You may. A duct 5 is connected to the chimney 98 at the outlet 93 of the outdoor air mixing chamber 96. Reference numeral 94 is a valve and a pipe installed to discharge the water droplets collected by falling to the lower portion of the outdoor air mixing chamber (96).

Hereinafter, by spraying an alkali solution in which caustic soda is dissolved in the wet purification chamber 10 of the exhaust gas treatment apparatus of the present embodiment, the acid exhaust gas discharged from an apparatus such as an incinerator is purged, and at the same time, an outside air mixing chamber 96 This section describes the effect of supplying external air to the) to prevent the generation of white smoke.

First, a process in which an acidic exhaust gas is purged in the wet purification chamber 10 will be described. If the exhaust gas is an acidic gas containing moisture, the exhaust gas contains SOx, NOx, HCl, dioxin and other harmful substances. In order to purify the acidic exhaust gas, an alkali solution is sprayed into the wet purification chamber 10 to be in contact with the acidic exhaust gas and neutralized. The exhaust gas passes through the eliminator to remove moisture and dust. Alkaline solutions may include calcium (Ca (OH) ₂ , CaO, CaCO ₃ ) and sodium (NaHCO ₃ , NaOH, Na ₂ CO ₃ ) solutions, but when using calcium solutions, the solubility of the reaction products is sodium It is preferable to use a sodium-based solution because much lower scaling occurs in the wet purification chamber 10 by precipitation.

First, the duct 1 to which the exhaust gas is supplied is connected to the inlet 17 of the wet purification chamber 10, and when the blower 90 is operated, the exhaust gas is introduced into the wet purification chamber 10 through the inlet 17. Is aspirated. Aspirated acidic exhaust gas is neutralized by reacting an alkali solution in which caustic soda (NaOH) sprayed from the injection nozzle 18 is dissolved.

SO ₂ + ₂ NaOH => Na ₂ SO ₃ + H ₂ O

SO ₂ + NaOH => NaHSO ₃

HCl + 2NaOH => NaCl + H ₂ O

NO + ₂ NaOH + 1 / 2O ₂ => Na ₂ (NO ₃ ) ₂

The exhaust gas neutralized by the above reaction is removed through the eliminator 11 to remove dust or moisture and is discharged through the outlet 12. Dust contained in the exhaust gas removed by the eliminator 11, neutralized salt, water, condensate, etc. are collected to the bottom of the wet purification chamber 10, the exhaust gas is always through the eliminator 11 It is discharged to the outlet 12 with the dust or water removed. Moisture collected by flowing to the lower portion of the wet purification chamber 10 is discharged to the sump 20. Dust or reaction salts contained in the solution collected in the sump is precipitated at the bottom of the sump (20). When the value measured by the PH sensor 81 installed in the water collecting tank 20 deviates from a predetermined value, the pump 83 is operated by a controller not shown to collect the caustic soda solution stored in the caustic soda storage tank 80. 20).

The exhaust gas discharged to the outlet 12 of the wet purification chamber 10 is supplied to the outside air mixing chamber 96 through the first inlet 91 by the first blower 90. In the exhaust gas supplied to the outside air mixing chamber 96, an alkali solution in which the hydrophilic caustic soda sprayed in the wet purification chamber 10 is dissolved, and a neutralized salt produced by the neutralization reaction remain. Therefore, when the cold outside air sucked by the second blower 95 is supplied into the outside air mixing chamber 96 through the second inlet port 92, the temperature of the exhaust gas mixed with the cold outside air is drastically lowered to exhaust gas. The water vapor contained in the condensation becomes supersaturated. The condensed water vapor flows through the outside air mixing chamber 96 and collides with, and coagulates with, an alkaline solution or neutralized salt in which hydrophilic caustic soda is dissolved to grow into a huge droplet. In particular, as the flow direction is changed by the partition 99, the mixing of the exhaust gas and the external air is performed well, and the flow path of the exhaust gas is long, so that the residence time becomes longer, so that the condensation and collision of the condensed water vapor and the cloud core are caused. This is further promoted so that the water droplets are greatly grown so that the water contained in the exhaust gas is rained in the air mixing chamber 96 to fall. At this time, the flow rate Qa1 of the external air supplied to the outside air mixing chamber 96 through the second blower 95 may be more than the flow rate Qe1 of the exhaust gas supplied through the first blower 90. . Temperature (Ta1) and flow rate of the external air to be mixed in order to supersaturate the water vapor contained in the exhaust gas with respect to the temperature (Te1) and the flow rate (Qe1) of the predetermined exhaust gas supplied to the outside air mixing chamber (96) Qa1) can be theoretically obtained, but this is related to the pressure inside the outside mixing chamber 96 and the time to stay inside the outside mixing chamber 96 until the exhaust gas is discharged to the outside. It is difficult to calculate Ta1 and the flow rate Qa1. Empirically, the flow rate of external air for the primary gas cooled through the wet purge chamber is determined by the moisture content of the exhaust gas, the temperature and the amount of caustic soda. It is recommended that the flow rate of the external air be at least four times the flow rate of the exhaust gas.

2 is a schematic diagram of another embodiment of the exhaust gas treating apparatus according to the present invention. The exhaust gas treatment apparatus of the embodiment shown in FIG. 2 is different from the exhaust gas treatment apparatus shown in FIG. 1. The wet purification chamber 10 of the embodiment shown in FIG. 1 is a horizontal type but the wet purification shown in FIG. 2. The chamber 10 is vertical. The exhaust gas treatment apparatus of the embodiment shown in FIG. 2 also has a spray nozzle 18 and an outside air mixing chamber 96 for spraying a hydrophilic alkaline solution, and generates white lead on the same principle as the embodiment shown in FIG. It is supposed to prevent.

That is, the method and apparatus for treating exhaust gas according to the present invention, as described above, contact the exhaust gas containing moisture with the surface of the cold heat exchanger to condense moisture on the surface of the heat exchanger to remove moisture from the exhaust gas. Unlike the conventional method, a hydrophilic cloud core is supplied to the exhaust gas and cold outside air is mixed so that the water vapor condensed in the entire exhaust gas flowing through the air mixing chamber is artificially formed through collision and agglomeration. There is originality to the point. That is, the exhaust gas treatment method for preventing the generation of white smoke according to the present invention includes two basic steps. The first process is to form a cloud core by spraying a hydrophilic alkali solution on the exhaust gas flowing through the wet purification chamber, and the second process is to supply the outside gas of low temperature while supplying the exhaust gas containing the cloud core to the outside air mixing chamber. The temperature of the exhaust gas is lowered to allow the water to condense, and the condensed water vapor to collide with the cloud nucleus and agglomerate so that it grows into giant droplets so that artificial rainfall is generated in the outside air mixing chamber.

According to the present invention, there is provided a method and apparatus for treating exhaust gas that can prevent the generation of white smoke. The method according to the present invention provides a method and apparatus that can purify acidic exhaust gases while at the same time simply prevent white smoke. In particular, in the case of using an exhaust gas purification facility in which a wet purification chamber exists, it is economical because only an external air mixing device for mixing external air with the exhaust gas can be used.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (11)

Passing the exhaust gas through a wet purification chamber in which the hydrophilic alkaline solution is sprayed so that a hydrophilic cloud core is formed inside the exhaust gas; The exhaust gas that has passed through the wet purification chamber is mixed with low temperature outside air to condense the water vapor contained in the exhaust gas into a supersaturated state, and the condensed water vapor collides with the cloud core so that the condensed water drops. Supplying the exhaust gas passing through the wet purification chamber to the first inlet, and supplying the outside air of lower temperature than the exhaust gas passing through the wet purification chamber to the second inlet of the outside air mixing chamber, the inside of the outside air mixing chamber than the atmospheric pressure And a step of discharging the exhaust gas and the external air in a state where high pressure is applied and discharging the exhaust gas through the outflow of the external air mixing chamber. The method of claim 1, And a flow rate of the external air supplied to the second inlet of the outside air mixing chamber is one or more times the flow rate of the exhaust gas. The method of claim 1, And a flow rate of the outside air supplied to the second inlet of the outside air mixing chamber is a flow rate such that the average pressure inside the outside air mixing chamber is a pressure higher than atmospheric pressure. The method according to any one of claims 1 to 3, The hydrophilic alkaline solution sprayed into the wet purification chamber is an alkaline solution containing caustic soda (NaOH), characterized in that the exhaust gas treatment method for preventing the generation of white smoke. The method of claim 4, wherein The outside air mixing chamber further comprises at least one diaphragm provided between the first inlet and the second inlet and the outlet so that the flow of the inlet gas and the outside air is mixed so that the flow direction is changed and discharged to the outlet. Treatment method of exhaust gas to prevent occurrence. The method of claim 4, wherein The wet purification chamber, It has an inlet for the exhaust gas flows in and an outlet for the treated exhaust gas flows out, and a drainage hole is formed in the upper side spaced a certain distance from the bottom surface, A mist eliminator disposed inside the wet purification chamber to separate the inside of the wet purification chamber into an inlet space and an outlet space, and having a bottom surface positioned below the drain hole; And a spray nozzle installed inside the wet purification chamber to spray the hydrophilic alkali solution into the space at the inlet side of the wet purification chamber. A wet purging chamber having an inlet for the exhaust gas to flow in and an outlet for the treated exhaust gas to flow out; A mist eliminator installed inside the wet purification chamber to separate the inside of the wet purification chamber into an inlet space and an outlet space; A spray nozzle installed inside the wet purification chamber to spray the hydrophilic alkaline solution into the space at the inlet side of the wet purification chamber, Outside air including a first inlet for introducing the exhaust gas discharged from the wet purification chamber, a second inlet for introducing external air, and an outlet connected to the chimney for discharging the exhaust gas mixed with external air Mixing chamber, A first blower installed at an upstream side of the first inlet of the outdoor air mixing chamber to supply the exhaust gas to the chamber through the first inlet; A second blower installed at an upstream side of the second inlet of the external air mixing chamber to supply external air to the chamber through the second inlet; The temperature of the outside air supplied to the outside air mixing chamber through the second blower is lower than the exhaust gas passing through the wet purification chamber, and the flow rate of the outside air supplied to the outside air mixing chamber through the second blower is controlled by the first blower. Apparatus for treating the exhaust gas to prevent the generation of white smoke, characterized in that more than the flow rate of the exhaust gas supplied to the outside air mixing chamber. The method of claim 7, wherein The flow rate of the outside air supplied to the outside air mixing chamber through the second blower is at least 1 times the flow rate of the exhaust gas supplied to the outside air mixing chamber through the first blower. Device. The method according to claim 7 or 8, The hydrophilic alkaline solution sprayed to the wet purification chamber is an alkaline solution containing caustic soda (NaOH), the exhaust gas treatment device for preventing the generation of smoke. The method of claim 9, The outside air mixing chamber further comprises at least one diaphragm provided between the first inlet and the second inlet and the outlet so that the flow of the inlet gas and the outside air is mixed so that the flow direction is changed and discharged to the outlet. Emission gas treatment system to prevent generation. The method of claim 10, The wet purification chamber has a drainage hole formed at an upper side spaced a predetermined distance from the bottom surface, The mist eliminator is disposed so that the bottom surface is located below the drain hole, the exhaust gas treatment device for preventing the generation of smoke.

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