JPS6022978B2 - Exhaust gas purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION There are various types of wet dust collectors used as exhaust gas treatment equipment, but these equipment have the disadvantage that they cannot effectively treat fine particles and gases, especially water-resistant gases. Electrostatic precipitators also have the disadvantage of not being able to collect gas.

In particular, water-insoluble gases generated from volatile solvents and plasticizers used in chemical plants such as adhesives and paint factories, such as benzenetoluene, xylene, and phthalate esters, are treated with conventional wet dust collectors or electrostatic precipitators. Even if used, it was difficult to remove. As a result of repeated research on methods for treating exhaust gas containing these water-insoluble gases, the present invention has been developed by chemically treating the water-insoluble gases in advance to form them into solid or liquid, preferably water-soluble, fine particles, and then charging them. The present invention was completed by discovering that agglomeration and/or wet processing is useful.

Embodiments of the present invention will be described below with reference to the drawings.

In the exhaust gas introduction duct 1 of the U-shaped exhaust gas passage, the water-retaining gas in the exhaust gas reacts with the water, converting it into solid, now liquid,
Preferably, injection ports 2 and 2' for ejecting a reactant to be converted into water-soluble fine particles are provided to form a reaction section A, and beyond that a discharge electrode 4 connected to a high pressure generator 14 via an insulator 3 is provided. A charging section B is formed in which a high voltage is applied between the discharge electrode and the inner wall of the exhaust gas passage to cause corona discharge. A liquid tank 5 for gas-liquid contact of exhaust gas and cleaning liquid treatment is provided below the charging section, connected to the charging section, and a nozzle 6 is attached to the upper part of the exhaust gas descending passage, and the water jetted from the nozzle flows into the passage. The liquid washes down the wall and flows into the liquid tank. The other end of the liquid tank 5 is connected to a U-shaped exhaust gas ascending passage 7, which forms a cleaning section C with a spray nozzle 8 and an eliminator 9 provided therein. The nozzles 6 and 8 are connected to a liquid tank via a pump 10 so that the cleaning liquid is circulated therein. In addition,
A sediment and suspended matter outlet 11 is provided on the side surface of the liquid tank 5.
will be established. Since the present invention is configured as described above, when the exhaust gas is introduced into the reaction section A, the exhaust gas undergoes a chemical change by contacting the reactant injected from the injection ports 2 and 2', and becomes solid or liquid. Alternatively, the particles are introduced into the next charging section B while changing into water-soluble liquid fine particles. The reactant used in the present invention may be either gas or liquid, and oxygen, ozone, oxidizing agents such as hydrogen peroxide, and sulfonating agents such as sulfuric acid, sulfuric anhydride, chlorosulfuric acid, and sulfuryl chloride can be used. However, it is particularly advantageous to use gaseous reactants such as ozone or sulfuric anhydride.

For example, when exhaust gas containing triene, xylene, etc. is treated with anhydrous sulfuric acid, these water-insoluble gases change to para- or ortho-toluene sulfonic acid and para-, ortho-, or meta-xylene sulfonic acid, respectively, which are insoluble in water. It becomes fine particles and is processed in the next process. Furthermore, unreacted sulfuric anhydride becomes liquid upon contact with water and is therefore easily removed. In the charging section B, pollutants in the exhaust gas are charged, collected on the inner wall of the charging section, and flowed down by water jetted from the nozzle 6.

In addition, in some cases, some of the charged fine particles are agglomerated and are struck against the liquid surface of the liquid tank together with the exhaust gas and removed, and the exhaust gas swirls and is purified while coming into gas-liquid contact with the upper part of the liquid tank in the cleaning section C.
will be introduced in In the cleaning section, the exhaust gas is captured and purified by gas-liquid contact with the cleaning liquid discharged from the water spray nozzle.
In this case, even if the fine pollutants in the exhaust gas cannot be removed with a normal scrubber, this device treats them with a reactant in advance and turns them into solid or liquid fine particles.
In addition, since the particles are charged and agglomerated in the charging section and become large, cleaning with a cleaning liquid becomes possible, and the effect becomes greater. The purified exhaust gas is dehumidified by an eliminator 9 and discharged to the outside.

In the device of the present invention, the water ejected from the nozzle 6 not only flows down the inner wall of the charging section and falls into the liquid tank, causing waves on the water surface 12, but also forms a water film 13 facing the swirling gas flow from the charging section. As a result, gas-liquid contact with the exhaust gas is promoted and it acts effectively on gas purification. It should be noted that if the passage shape of the charging section and the cleaning section is made into an inverted truncated conical shape, cleaning will form an uninterrupted water film on the inner wall, which will be more effective for wall surface cleaning and gas-liquid contact with the exhaust gas.

In addition, the fan used for blowing the exhaust gas can be pushed in or a suction fan can be installed before and after the ionization section or cleaning section, but if it is installed in the upper passage of the liquid tank, it will be more effective due to the gas-liquid contact between the liquid tank surface and the exhaust gas due to the footing effect. It is true.

According to the device of the present invention, by providing a reaction part in the exhaust gas introduction duct, the contaminated gas to be removed is converted into solid or liquid, preferably water-soluble, fine particles that can be electrostatically or wet-collected. In addition to trapping and removing gas, the exhaust gas treatment passage is formed in a U-shape, allowing effective gas-liquid contact with the exhaust gas, resulting in a high rate of exhaust gas purification.

Furthermore, since the charging section and the cleaning section are formed on the liquid tank, the cleaning solution can be efficiently processed and recycled.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal sectional view showing an embodiment of the present invention. A...Reaction part, B...Charging part, C...Cleaning part, 2,2
'...Injection port, 4...Discharge electrode, 5...Liquid tank, 6...
Nozzle, 8... Water light fog nozzle, 9... Eliminator.

Claims (1)

[Claims] 1 Exhaust gas introduction duct 1 with U-shaped exhaust gas passage
Injection ports 2 and 2' for ejecting substances that react with organic solvent-based pollutant gas components are provided inside the U-shaped exhaust gas descending passage, and a charging section B is installed inside the U-shaped exhaust gas descending passage. An exhaust gas purification device characterized in that a liquid tank 5 is provided at the lower bottom of the passage leading to the exhaust gas, and a cleaning section C is provided in the exhaust gas rising passage.