KR200328409Y1 - Adsorption Tower with Direct Hot Air Jet to Activated Carbon Bed Type Desorbe - Google Patents

Abstract

The present invention is designed to be applied to an adsorption tower having a device for desorbing with hot air. Previously, as shown in FIG. 2, the desorption hot air is introduced into the inlet 602, and after desorption, the hot air and the desorbing VOC go out to the desorption hot air outlet 603. Because of the structure, the heat loss through the main body during the desorption was large, there was a problem that takes three times the theoretical desorption heat.

Therefore, the present invention provides a grid-like pipe with several small holes at both ends of the activated carbon layer, as shown in FIG. 4, by directly injecting desorption hot air from the one pipe into the activated carbon, and desorbing the desorption hot air and the desorbing VOC from the opposite pipe. By maximizing the desorption effect.

More specifically, the present invention is shown in the adsorption tower when working in Figures 3 and 4. Open the outlet dampers (102, 103) and operate the exhaust fan (2) to pass the VOCs through the activated carbon 101 charged in the adsorption tower (1) to fix the adsorption, and then desorbs and regenerates the VOCs adsorbed and fixed to the activated carbon during operation. Silver adsorption tower mouth. Desorption hot air spraying installed at the end of activated carbon in the adsorption tower by closing the outlet dampers 102 and 103 and opening the desorption hot air open / close valve 601 while the exhaust fan 2 is stopped and operating the desorption hot air fan 4 and the heater 501. The hot air that is introduced into the pipe 604 and blows hot air through a plurality of desorption hot air spray holes 606 to heat and desorb the activated carbon, and the desorption hot air of the desorption hot air suction pipe 605 on the opposite side are generated. The high temperature sucked into the suction hole 608 and then passed through the hot air fan 4 to the catalytic combustion device 5 and heated by the heater 501 and then catalytically decomposed while passing through the catalyst layer 502 and further heated by decomposition heat The hot air has a circulation structure that enters the desorption hot air spray pipe 604.

As a result, the desorption can be performed with much less heat than the conventional desorption heat amount, so that it can be applied to all adsorption towers adopting the desorption method with hot air, thereby maintaining economical desorption of less heat.

Description

Adsorption Tower with Direct Hot Air Jet to Activated Carbon Bed Type Desorbe

Exhaust gases emitted from various facilities, such as paint booths and drying furnace facilities, contain volatile organic compounds (VOCs) such as toluene and xylene, which are emitted into the atmosphere, causing air pollution. .

In order to prevent air pollution due to such VOCs, various types of purification facilities are used, but most of them use the activated carbon adsorption method shown in FIG.

However, the activated carbon is desaturated by adsorbing a certain amount of VOC, so that it can not be adsorbed anymore, so it can be replaced at regular intervals or recently, as shown in FIG. 2, by using hot air to prevent excessive operating costs due to the replacement of activated carbon. Adsorption is used after regeneration.

For example, in the case of painting booth, it is adsorbed in activated carbon adsorption tower during painting work, and during operation, the small fan and heater are used to make hot air and put it in activated carbon layer for heating and desorption. I use it.

However, when desorption was carried out in this manner, it was found that a large part of the heat of desorption consumed 2-3 times more than the theoretical heat required for actual VOC desorption due to heat loss to the body casing. The power cost is increased due to the large capacity of the heater and the excessive heat of desorption, and it is also the cause of the increase of the equipment cost, such as the heat retention of the main body of the adsorption tower to reduce the heat loss during the desorption.

Therefore, the present invention was designed to maximize the desorption efficiency by improving the desorption structure so that sufficient desorption can be achieved with a low desorption heat amount.

In order to explain the system of the present invention, the activated carbon adsorption method and the car painting booth driving method are explained as follows.

(1) activated carbon adsorption

Activated carbon has many fine pores and a large surface area. When VOCs with high molecular weight such as benzene, toluene, and xylene gas pass through the activated carbon layer, organic gas molecules are introduced into the micropores by van der Waals forces. It is adsorbed in a condensed state by maintaining a high concentration. This adsorption characteristic means that the VOC is continuously adsorbed and has a limited characteristic that can not be adsorbed anymore. This means that the activated carbon introduced into the adsorption column is no longer able to remove the VOC when the activated carbon is saturated. It must be replaced or removed and reused.

The desorption process for desorption and reuse of activated carbon may be performed by applying hot air of 100 ° C. or higher because the VOC adsorbed on the surface of the activated carbon in the liquid phase is heated by evaporation and desorption by boiling hot air above the boiling point to restore the activated carbon micropores to their original state.

(2) Outline of VOC treatment method

(A) Non-removable adsorption method (Fig. 1 method)

As shown in FIG. 1, the activated carbon is charged in a simple container in the simplest manner, and then the adsorption is removed by passing the VOC there.

However, since this method is a simple device without a desorption regeneration device, the activated carbon replacement cost is excessive because the activated carbon needs to be replaced when saturated by continuous adsorption of VOC.

When about 5000 liters of paint is used per year, the evaporation amount of solvent is 2500 ~ 3000kg, so the amount of activated carbon is 8500 ~ 10000kg and the replacement cost is about 12,750,000 ~ 15,000,000 won.

(B) Small capacity catalytic combustion device type desorption method (Fig. 2 method)

The present method is to desorb and regenerate activated carbon during operation after adsorbing and removing VOC through activated carbon charged during operation. With the outlet dampers 102 and 103 closed and the exhaust fan 2 stopped, the desorption hot air open / close valve 601 is opened and the desorption hot air fan 4 and the heater 501 are operated to introduce hot air into the adsorption tower to heat and desorb the activated carbon. In addition, the VOC generated during desorption is composed of a circulation structure in which the catalyst is decomposed while being heated by a heater again and then passed through the catalyst layer.

At this time, by controlling the amount of heat of the heater by the temperature (for example, 300 ℃) set in the automatic temperature controller 503 located at the rear of the heater to maintain a temperature capable of catalytic decomposition at all times.

For reference, the catalytic combustion device used as the desorption device is as follows. The catalyst is composed of platinum, palladium, etc. It does not participate directly in the reaction itself, but lowers the activation energy of the reactants to promote the reaction, so it is burned at 150 ~ 350 ℃ much lower than the combustion oxidation temperature of VOC 600 ~ 800 ℃ It is a substance that enables oxidation and saves energy. Catalytic combustion is a method using such a catalyst is heated to 150 ~ 350 ℃ capable of combustion decomposition by passing through the catalyst layer to remove the combustion by the reaction scheme is as follows.

As shown in the above reaction, when decomposing VOC in the catalyst layer, the gas temperature rises due to self-oxidation heat, and the degree of increase is proportional to the VOC concentration. Higher efficiency enables more than 95% high efficiency processing.

The present invention is an improvement to enable sufficient desorption with much less desorption heat amount than the conventional hot air desorption method, and is designed to achieve sufficient desorption of activated carbon with a small desorption supply heat. Modifications were made to maximize the desorption efficiency and to achieve sufficient desorption with less heat.

In other words, in the past, the desorption hot air was introduced into the desorption hot air inlet 603 attached to the adsorption tower, and the activated carbon was heated to the desorption hot air outlet 602. However, the present invention has a desorption having multiple hot air jet holes at both ends of the activated carbon. The hot air spray pipe 604 and the desorption hot air suction pipe 605 are attached to the activated carbon to directly inject and inhale the hot air to remove and desorb with little heat loss.

1 is a flow chart of a non-removable adsorption tower

2 is a flow chart of the adsorption tower having a desorption method by desorption hot air

Figure 3 is a flow chart of the adsorption tower having a direct carbon wind desorption method activated activated bed

Figure 4 is a detailed view of the activated carbon bed direct hot air injection type desorption hot air supply pipe

* Explanation of symbols for main parts of the drawings

1.Adsorption tower 101 ... Activated carbon

102.Adsorption tower entrance opening and closing damper 103 ... Suction tower exit opening and closing damper

104 ... Activated Carbon Support Network 2 ... Exhaust Fan

3 ... stack 4 ... detachable hot air fan

5 ... small catalytic combustion unit 501 ... heater

502 Catalyst 503 Thermostat

6.Removable hot air duct 601 ... Removable hot air open / close valve

602 Desorption hot air outlet 603 Desorption hot air outlet

604 Desorption Hot Air Suction Pipe 605 Desorption Hot Air Suction Pipe

606 Desorption Hot Air Suction Hole 607 Desorption Hot Air Suction Hole

The present invention provides a plurality of small injection holes 606 which are drilled in a pipe by installing a desorption hot air spray pipe 604 and a desorption hot air suction pipe 605 on both ends of the activated carbon as shown in FIG. Desorption effect is increased by putting the desorption hot air evenly directly into the activated carbon through the suction hole (607).

Hereinafter, with reference to Figures 3 and 4 will be described in detail the technical configuration for achieving the object of the present invention.

When working in Figure 3 the adsorption tower. Open the outlet dampers (102, 103) and operate the exhaust fan (2) to pass the VOCs through the activated carbon 101 charged in the adsorption tower (1) to fix the adsorption, and then desorbs and regenerates the VOCs adsorbed and fixed to the activated carbon during operation. Silver adsorption tower mouth. Desorption hot air spraying installed at the end of activated carbon in the adsorption tower by closing the outlet dampers 102 and 103 and opening the desorption hot air open / close valve 601 while the exhaust fan 2 is stopped and operating the desorption hot air fan 4 and the heater 501. The hot air that is introduced into the pipe 604 and blows hot air through a plurality of desorption hot air spray holes 606 to heat and desorb the activated carbon, and the desorption hot air of the desorption hot air suction pipe 605 on the opposite side are generated. The high temperature sucked into the suction hole 608 and then passed through the hot air fan 4 to the catalytic combustion device 5 and heated by the heater 501 and then catalytically decomposed while passing through the catalyst layer 502 and further heated by decomposition heat The hot air has a circulation structure that enters the desorption hot air spray pipe 604.

In order to maintain the high efficiency decomposable temperature in the catalytic combustion device (5), the temperature at which the high-efficiency catalytic decomposition is always possible by controlling the heat of the heater by the temperature (for example, 300 ° C.) set by the automatic temperature controller 503 located at the rear of the heater. Keep it.

If the concrete description of the operation of the present invention

The heat of desorption required for desorption of activated carbon is largely dissipated by the amount of heat consumed by evaporating VOC to desorb VOC condensed and adsorbed in micropores and the heat deprived of activated carbon when heating desorption heat, that is, the amount of heat required for activated carbon heating and casing. It can be divided into outgoing heat loss. In practice, in the conventional method of FIG. 2, the first one was about 5% of the desorption heat, the second was about 30%, and the third was about 65%.

This third is large because the desorption time is usually longer than 10 hours and hot air enters the adsorption column tube and is in direct contact with the casing, so that the amount of heat loss to the casing is large.

Therefore, in order to desorption with a small amount of heat of desorption, the amount of heat required for evaporation of VOC, which is the first heat of desorption, and the amount of heat required for heating activated carbon, cannot be reduced.

In order to minimize the third heat loss, as shown in FIG. 4, the desorption hot air heating is installed by attaching a plurality of holes to both ends of the activated carbon layer with a lattice pipe, and the hot air is evenly sprayed on the activated carbon through the multiple holes and heated. The VOC generated by the desorption is evenly sucked into several holes in the suction pipe on the opposite side, so that the hot air is not only effective for heating the activated carbon, but also the hot air is introduced while filling the casing before the hot air is in contact with the casing. Separated from the casing is configured to minimize the heat loss lost through the casing.

The grid-shaped hot air pipes on both ends of the activated carbon installed to increase the desorption effect as well as the role of supporting the activated carbon support network 102 as a booth to enhance the desorption effect.

To explain the effect of the invention numerically as follows.

For example, in the method of FIG. 3, the amount of desorption heat required when 100 kg of activated carbon charged in 100 kg of VOC adsorption amount is 100 kg X adsorption heat of 100 kg x evaporation heat 100 kcal / kg = 10000 kcal, and activated carbon heating amount is 1000 kg of activated carbon X specific heat 0.4 kcal / kg- ℃ X heating temperature is about 150 ℃ = 60000 kcal and heat loss calories empirically driving about 130000 kcal, totaling 200000 kcal.

It takes about 10 hours to supply the desorption heat supply to a 20kw heater.

When the present invention is applied to Figures 3 and 4, the heat loss is significantly reduced to about 1/5, which requires a total of 100000 kcal, so that the overall desorption heat amount can be reduced by half, thereby reducing power costs and desorption time. It can increase the operation efficiency of the equipment.

Incidentally, the hot air pipe also serves as an activated carbon support.

Claims (1)

It is equipped with an adsorption tower filled with activated carbon and an automatic switching damper at the inlet and outlet, and a catalytic combustion device containing a heater and a catalyst. It is a device which decomposes volatile organic compound vapor during operation and decomposes volatile organic compound vapor desorbed from catalytic combustion device by desorption by hot air during operation. An exhaust fan which guides the air containing the volatile organic compound vapors by adsorption and blows them to the atmosphere; Desorption hot air fan that sucks desorption hot air and blows it onto activated carbon through a catalytic combustion device; Desorption hot air pipe through which desorption hot air flows; Desorption hot air opening and closing valve to block the desorption hot air; A desorption hot air spray pipe which is connected to the desorption hot air pipe inlet and is located at one end of the activated carbon layer filled in the adsorption column and has a plurality of small holes drilled into the activated carbon in the form of a lattice pipe; It is connected to the outlet of the desorption hot air pipe and is located on the opposite end of the activated carbon bed where the desorption hot air spray pipe is installed, and it consists of a series of devices installed with desorption hot air suction pipe in the form of a lattice pipe with several small holes in the pipe. Activated carbon bed direct hot air spray type desorption apparatus attached type adsorption column.