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Method for treating exhaust gas in Dongguan dustproof workshop
The methods of treating waste gas in Dongguan dust-proof workshop include activated carbon adsorption method, direct combustion method, catalyst oxidation decomposition method and regenerative combustion method. Therefore, when designing a spray-free dust-free workshop, we must choose the method with the best deodorization and economic effects according to the composition, treatment volume and site conditions of the exhaust gas. In the following, we introduce these methods:
Adsorption method, adsorption with activated carbon, processing gas flow rate of 0.3-0.6M / S, carbon layer thickness of 0.8-1.5M; this method of Dongguan dust workshop has its unique advantages: it can recover solvents, can purify low content, Low temperature exhaust gas; no heating required; but its disadvantages are: limited to low concentration; pretreatment is required to remove paint mist, dust, smoke, oil and other impurities, and high temperature exhaust gas needs to be cooled.
The catalyst oxidation method, at 200-400 degrees Celsius, depends on the catalyst oxidation oxidation residence time of 0.14-0.24S; the advantage is that the device is small, the fuel cost is low, and the generation of NOX is small; the disadvantage is that it requires good pretreatment, and the catalyst and equipment are more expensive. About three times the former, catalyst poisoning and surface foreign body adhesion are prone to failure.
Dongguan dust-proof workshop direct combustion method, burning at 600-800 degrees Celsius, dwell time 0.3-0.5S; advantages: simple operation, easy maintenance, no pretreatment required, organic matter can be completely burned, and the combustion heat can be used as a heat source for the drying room. Utilization is beneficial for purifying high-content air; disadvantages NOx exhaust gas increases, and fuel costs are greater when treated separately.
The exhaust gas from the dust-proof workshop in Dongguan generally contains oil fume, which is easy to be treated by direct combustion, especially in the cases where natural gas and fuel are used as heat sources. The exhaust gas from the drying room in the spraying workshop can enter the drying room as supplementary air and then become a drying room. The exhaust gas is discharged and directly burned into the combustion furnace. In the case of a large amount of air, a regenerative combustion device with high equipment costs and low operating costs can also be used.