KR200210607Y1 - System to removing a white smoke - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a white smoke prevention system for preventing the white smoke of the exhaust gas, and in particular, after the exhaust gas discharged in the wet saturated state by the thermo-hygrostat using an air-cooled heat exchanger, the heat of recovery of the heat exchanger By heating the exhaust gas to the temperature necessary to remove the white smoke by using to reduce the relative humidity to prevent the white smoke economically and effectively.

I. The technical problem the invention is trying to solve.

As an attempt to prevent white smoke, it is necessary to reduce the relative humidity to 100% or less by heating the exhaust gas in a wet saturated state until the white smoke disappears. The method of reducing the relative humidity of the exhaust gas by diluting the exhaust gas by mixing the outside air is also high and the installation cost including the large capacity dilution device is very high because a large amount of dilution air is required to reduce the relative humidity. There is a problem.

All. The gist of the solution of the invention.

An air-cooled heat exchanger is installed at the rear of the facility where the white smoke is generated, and the wet saturated gas discharged from the facility is cooled to remove supersaturated water vapor in the wet gas with condensed water to reduce absolute humidity first, and then discharged from the heat exchanger. By mixing the superheated air with the humid gas, it is possible to reduce the state humidity of the exhaust gas discharged to effectively prevent white smoke.

la. Important uses of the devise

Removal of white lead.

Description

Smoke prevention system {System to removing a white smoke}

The present invention mainly relates to a white smoke prevention system for preventing white smoke from being generated through a stack when harmful gases generated in an incinerator are wet removed. In particular, an air-cooled heat exchange method for exhaust gas in a wet saturated state is provided. It is economical and effective to reduce the relative humidity of exhaust gas by first removing certain amount of water by cooling by using a gas and then raising the temperature of exhaust gas to the temperature necessary to remove white smoke by using recovery heat from the heat exchanger. It is to prevent white smoke.

In general, white smoke is known as white smoke generated by exhaustion of water vapor in exhaust gas below a dew point. The main cause of the white smoke is the gas scrubber, which is generated when incineration of waste is incinerated. This is most likely caused by a wet removal using scrubber.

Therefore, in this case, the generation path of the white smoke is that when the hot exhaust gas generated after incineration passes through the gas scrubber, the contact gas with the washing water contains a large amount of moisture, thereby increasing the moisture concentration to about 30% to 35%. At the same time, since the exhaust gas is discharged to the atmosphere after being cooled to about 60 ° C. to 80 ° C., the smoke contained in the supersaturated state of the exhaust gas is depleted and white smoke is generated.

Therefore, the white smoke has no special damage in daily life because the pollutant is almost removed while passing through the gas scrubber, but it becomes a visual disturbance in the landscape or around the airfield, and in view of the recognition of the pollutant visible. Removal measures are increasingly being tried.

However, in a method that is attempted to prevent such white smoke, a large amount of dilution air is required in a method of mixing the high temperature air from the outside to reduce the relative humidity according to the exhaust gas dilution, so that a large amount of dilution apparatus is used. The installation cost is very high, and the method of removing the moisture in the exhaust gas by heating the exhaust gas directly by installing a burner on the stack is the amount of fuel required to heat the exhaust gas in the wet saturated state until the white smoke disappears. Since there are many problems, there is a problem of high facility maintenance costs, especially when the temperature of the outside air is low in winter, at least the temperature of the exhaust gas has to be heated to a high temperature of 300 ° C. or higher, and thus the fuel consumption becomes much larger.

Therefore, the above-described white smoke prevention method is difficult in attempting to prevent white smoke due to high installation cost and maintenance cost in view of the fact that white smoke is a contaminant in the visible aspect.

The present invention has been made to solve the above problems, by installing an air-cooled heat exchanger at the rear end of the facility where the white smoke is generated, by cooling the wet saturated gas discharged from the facility to remove the supersaturated water vapor with condensed water After reducing the absolute humidity in the exhaust gas, the superheated air that is exchanged from the heat exchanger is mixed with the wet gas to reduce the relative humidity of the exhaust gas to the extent that white smoke does not occur, so that the white smoke is generated even with a slight power ratio. It can be removed effectively and completely.

1 is a flow chart showing the configuration of the present invention smoke prevention system.

2 is a flow chart of a smoke prevention system including a cooling condenser in front of a heat exchanger.

Figure 3 is a schematic diagram showing the heat exchange method of the heat exchanger used in the present invention system.

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

1: wet saturated gas 1a: wet gas

1c: exhaust gas 2: condensate

3: cooling air 4: superheated air

10: outlet 20: heat exchanger

30: stack 40: cooling condenser

50: burner

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, reference numerals for respective mirror parts are omitted.

As shown in FIG. 1, the smoke prevention system according to the present invention includes an air-cooled heat exchanger 20 installed at a rear end of a discharge facility 10 in which white smoke is generated, and a wet saturated gas that is cooled while passing through the heat exchanger 20 ( The supersaturated water vapor in 1) is discharged to the condensate (2), and the wet gas (1a) through which the moisture in the wet saturated gas (1) is removed to some extent is passed through the heat exchanger (20) to the heat exchanger (20). The introduced cooling air (3) is mixed with the superheated air (3a) discharged after heat exchange to reduce the relative humidity of the exhaust gas (1b) discharged through the stack (30) to the extent that white smoke does not occur.

At this time, if the relative humidity of the exhaust gas (1b) to prevent white smoke is possible to 100% or less, it is possible to fully consider the possibility of white smoke due to the change in the atmospheric temperature contacted at the point passing through the stack (30). It is desirable to design it to be discharged with the relative humidity of 1b) below 60%.

In addition, as shown in FIG. 3, the heat exchanger 20 is cooled while the wet saturated gas 1 passes through the inside of the pipe 21 and the cooling air 3 passes through the outer periphery of the pipe 21. The heat exchanger is cooled to cool the wet saturated gas 1 while the air 3 and the wet saturated gas 1 are in contact with each other. The heat fins 23 are provided on the outer circumferential surface of the pipe 21 to provide cooling air and exhaust gas. The cooling area can be increased by increasing the contact area of the pipe 21, and a contact plate 22 having a zigzag shape is installed inside the pipe 21 so that the water vapor condensed while the wet saturated gas 1 passes through the contact plate 22. The surface tension is generated by contact with the material so that it can flow down and is effectively removed.

At this time, the technique for increasing the contact area by installing the heat transfer fins 23 on the outer circumferential surface of the pipe 21 is already commonly used in the art, but by installing the contact plate 22 inside the pipe 21 to exhaust gas The technology to remove the water at the same time can be said to be a pre-treatment method that can effectively remove the white smoke in the smoke prevention system of the present invention.

On the other hand, when the temperature of the wet saturated gas 1 which flows into the heat exchanger 20 is rather high, 80 degreeC or more, the cooling condenser 40 in which the super fine particle cooling water is sprayed by the high pressure is made into the said heat exchanger ( 20, and the temperature of the wet saturated gas (1) introduced into the heat exchanger (20) by evaporating the cooling water by the heat amount of the wet saturated gas (1) flowing into the cooling condenser (40) to 80 ° C or less It should be reduced to effectively prevent white smoke. For this reason, when the temperature of the gas introduced into the heat exchanger 20 is 80 ° C. or more, it is necessary when the amount of heat exchanged necessary for cooling the temperature of the gas by 1 ° C. by the heat exchanger 20 is 80 ° C. or less. This is because it takes much larger than the heat of exchange.

Therefore, the smoke prevention system according to the present invention configured as described above removes supersaturated water vapor in the wet saturated gas containing a large amount of water while passing through a gas scrubber to the condensed water 2 by the heat exchanger 20 to provide absolute humidity in the exhaust gas. After first reducing the first, by mixing the superheated air (3a) discharged from the heat exchanger 20 to reduce the ratio of the water vapor contained in the wet gas by increasing the capacity of the heat source and gas by the superheated air secondary By lowering the relative humidity below the level at which white smoke does not occur, white smoke is not generated in the exhaust gas discharged through the stack 30.

The smoke prevention system of the present invention first reduces the supersaturated moisture in the exhaust gas, and then uses the superheated air after heat exchange that is used for cooling the exhaust gas to use it as a heating heat source for removing the white smoke. Not only is the amount of heat required to remove the white smoke by heating the gas from the beginning, but also the removal efficiency is excellent, so it is economical and effective to prevent white smoke in the system without the need for a separate heating device or dilution air. It is.

Claims (3)

An air-cooled heat exchanger (20) is installed at the rear of the discharge facility (10) where white smoke is generated, and supersaturated water vapor in the wet saturated gas (1) cooled while passing through the heat exchanger (20) is discharged to the condensed water (2). By reducing the absolute humidity, the superheated air (3a) is discharged after the heat exchanger 20, the cooling air (3) flowing into the heat exchanger 20 to the wet gas (1a) passing through the heat exchanger (20) White smoke prevention system comprising the step of reducing the relative humidity of the exhaust gas (1b) discharged through the stack (30) to the extent that white smoke does not occur. The smoke prevention system according to claim 1, wherein a contact plate (22) is installed inside the pipe (21) of the heat exchanger (20). According to claim 1, wherein the front end of the heat exchanger (20) is provided with a cooling condenser (40) to be sprayed with the cooling water of the microparticles by high pressure, so that the wet saturated gas (1) flowing into the heat exchanger (20) White smoke prevention system to make temperature below 80 ℃.