Analysis of Elimination Method of Organic Waste Gas Treatment
Elimination of organic waste gas treatment with thermal oxidation, catalytic combustion, bio-oxidation and integration technology. Organic waste gas treatment to eliminate mainly through chemical or biochemical reactions, with heat, catalysts and microorganisms to organic matter into CO2 and water. Thermal oxidation of organic waste gas treatment Thermal oxidation system is a flame oxidizer, through the combustion to eliminate organic matter, the operating temperature up to 700 degrees to 1000 degrees. This inevitably has a high fuel cost and in order to reduce fuel costs it is necessary to recover the heat in the exhaust gas leaving the oxidizer. There are two ways to recover heat: traditional heat exchange between walls and new non-steady state heat exchangers. Split wall thermal oxidation uses trapped or slab heat exchangers to capture the heat of the purge exhaust gas. It recycles 40% to 70% of the heat energy and uses the recovered heat to preheat the organic exhaust entering the oxidation system. Preheated exhaust gas and then through the flame to reach the oxidation temperature, purification, the shortcomings of wall heat exchange is not efficient heat recovery. Regenerative thermal oxidation (referred to as RTO) recovery of heat using a new non-steady-state heat transfer method. The main principle is that the organic waste gas and the purified exhaust gas are alternately circulated to maximize the heat capture by continuously changing the flow direction. The heat storage system provides high heat recovery of regenerative thermal oxidation / catalytic combustion, During the cycle, VOC-containing VOCs enter the RTO system, first entering the refractory heat storage bed (the bed has been heated by the purge gas from the previous cycle), and exhaust gas absorbs heat from the bed to raise the temperature and then into the oxidation The VOC is oxidized to CO 2 and H 2 O in the oxidation chamber, and the exhaust gas is purified. The oxidized high temperature purification gas leaves the combustion chamber and enters another cold heat storage bed, which absorbs heat from the purified exhaust gas and stores it (Used to preheat the next cycle of organic exhaust into the system). And to purify the exhaust gas temperature decreases. This process is carried out until a certain time, the gas flow direction is reversed, organic waste gas from the bed into the system. This cycle continuously absorbs and emits heat, and the heat storage bed, which is a heat sink, constantly changes in the way of operation at the inlet and outlet to produce efficient heat recovery with a heat recovery rate of up to 95% and a VOC elimination rate of up to 99% .
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