How does activated carbon absorb harmful gases?
Organic waste gas activated carbon adsorption:
Organic waste gas treatment generally has catalytic combustion method, activated carbon adsorption desorption method, direct combustion type and other methods. When the total concentration of exhaust gas is below 1000g/m3 and the outlet temperature is less than 45°C, its nature belongs to low concentration exhaust gas. Therefore, the choice of activated carbon adsorption - catalytic combustion desorption is more reasonable.
Principle of activated carbon adsorption:
The essence of activated carbon adsorption is to adsorb the organic solvent in the low-concentration large-volume exhaust gas to the activated carbon and concentrate it by the adsorption characteristics of the activated carbon. The gas purified by the activated carbon adsorption is directly emptied, and the essence is a process of adsorption and concentration. The organic solvent was not disposed of. It is a physical process.
The essence of catalytic combustion desorption is to use the hot air of catalytic combustion to heat the adsorbed organic solvent in the activated carbon to reach the boiling point of the solvent, to desorb the organic solvent from the activated carbon, and to introduce the high concentration of exhaust gas into the catalytic combustion. In the reactor. At a catalytic light-off temperature of -250 ° C, the oxidation reaction is converted into harmless water and two carbonized carbon into the atmosphere by the action of the catalyst. It is a chemical reaction process. It is not the burning of open flames, and it can completely solve the secondary pollution during desorption.
Activated carbon adsorption-catalytic combustion desorption is an effective combination of the advantages of the two. First, the activated carbon is used for adsorption and concentration. When the adsorption of activated carbon reaches saturation, the catalytic combustion equipment is started by electric heating, and the activated carbon adsorption bed is locally heated by hot air. When the catalytic combustion reaction bed is heated to ~250 ° C, the activated carbon adsorption bed partially reaches 60. At ~110 ° C, the high concentration of exhaust gas desorbed from the adsorbent bed can be oxidized in a catalytic reaction bed. After the reaction, the high-temperature gas is exchanged by the heat exchanger, and a part of the heat-exchanged gas is returned to the activated carbon adsorption bed for desorption, and the other part is discharged into the atmosphere. The temperature of the desorbed exhaust gas is rapidly increased after heat exchange through the heat exchanger. This enables the catalytic combustion unit and desorption to operate at low or no power.
Regeneration and desorption are performed when the suction work is interrupted.
Exhaust gas treatment purification device:
1 Activated carbon adsorption purification device treatment air volume 5000m3 / h 10000m3 / h 15000m3 / h
Dimensions 2500 × 1500 × 1850 3000 × 2500 × 2900 4200 × 3000 × 3600
Installed power 0.75kw 0.75kw 1.1kw
2 Catalytic combustion desorption purification device treatment air volume 1000m3 / h 2000m3 / h 3000m3 / h
Dimensions 1050 × 800 × 1730 1450 × 800 × 1980 1650 × 1350 × 2430
Installed power 27kw 39kw 49.5kw
3 adsorption fan model 4-68No4.5A 4-68No6.3C 4-68No6.5C25
Power 7.5kw 11kw 15kw
4 Decoupled fan model Y6-30No4.8C Y6-30No6.5C y5-48No5C
Power 3kw 5.5kw 7.5kw
5 air heater model 1350×800×750 1750×800×800 1950×1350×1000
Power 18kw 24kw 27kw
6 Honeycomb activated carbon loading 2.1M3 3.1M3 4.2M3
7 Honeycomb catalyst loading 0.1M3 0.2M3 0.3M3
8 Inhalation concentration <1000mg/m3
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