het gezuiverde gas wordt in de atmosfeer geloosd. Actieve kool heeft goede adsorptieprestaties en een redelijk kostenvoordeel,hetis het meest gebruikte adsorbens. De studie toont aan dat actieve kool eengoedzuiveringseffect op VOS met een massaconcentratie van ongeveer 100 mg/m3, en delevenslangis meer dan 1000 uur. Het gebruik van specifieke chemische stoffen die geïmpregneerd zijn ommakengeactiveerde koolstof,dienaarzwavel, waterstofsulfide, benzeen, aceton, octaangetal en ander specifiek gas,is veel gebruiktop specifieke plaatsen en specifieke industrie.
Bovendien heeft actieve koolstofvezel (ACF) een beter adsorptiegedrag dan actieve kool, het’
The activated carbon adsorbent is modified to make it have a better adsorption and desorption performance. Commonly used adsorbent modifications include surface structure modification and surface chemical modification. The modified activated carbon generally has a larger specific surface area, a richer pore structure, a more uniform pore size distribution, and an improved adsorption performance for different polar substances. The adsorption effect of certain substances is enhanced and other properties. Therefore, it is more suitable for the adsorption and purification of different pollutants. The activated carbon is impregnated and modified with HNO3, H2SO4, HCl, H3PO4, CH3COOH, KOH, and NaOH solutions to purify mixed waste gas of benzene, toluene, xylene, methanol, ethanol, isopropanol, and butanone. The study found that the adsorption capacity of activated carbon after alkali solution modification was reduced, among the acid-modified samples, the performance of activated carbon impregnated with H3PO4 increased the most. Except for the decrease of the adsorption capacity of m-xylene and butanone, the adsorption capacity of other pollutants has been greatly improved. This is because the decrease in the adsorption capacity of the two substances is due to the modification of phosphoric acid, which reduces the ability of activated carbon to adsorb macromolecular organic substances. At the same time, although phosphoric acid narrows the micropores of activated carbon, it changes its surface, which makes the chemical properties of the modified activated carbon increase the adsorption capacity of other organic substances.
When the organic waste gas contains flammable gas, there is a safety hazard due to the heat generated during the adsorption process. The solution is to limit the VOCs content of the inlet airflow to less than 25%, and air dilution is one of the feasible methods. When the molecular weight of VOCs is greater than 130 and has low volatility (boiling point greater than 240 ℃), the adsorbent will strongly adsorb it, which will cause difficulty in desorption. On integendeel, wanneer het molecuulgewicht van VOS minder dan 45 is, is de adsorptie niet sterk, en voor organisch afvalgas van het gemengde type, wanneer het molecuulgewicht van de organische stof in het afvalgas te veel verschilt, is het adsorptie-effect niet goed. Daarom moet de adsorptiemethode redelijkerwijs worden toegepast in overeenstemming met de aard van het organische afvalgas.
