What are the differences between direct combustion and catalytic combustion
Waste recycling equipment manufacturer shares that the combustion method of domestic waste treatment equipment can be divided into two, namely direct combustion and catalytic oxidation combustion. Direct combustion method refers to when the combustion gas at the same time, through the oxidation thermal decomposition method, and the heat degradation will be harmful VOCs in the combustion chamber, the harmful VOCs gases after input into the combustion chamber, when the objective factors such as high temperature and enough air condition under the premise of perfect, the harmful gas fully burning completely, finally make it completely decomposed into CO2 and H2O. And direct combustion method is this kind of VOCs combustion burnable waste gas, the method in the treatment of high concentration VOCs gases, show that the effect is better, but the corresponding requirements for the control of the temperature is very high, must under the condition of high temperature, when the temperature in the vicinity of 1100 ℃, the removal efficiency can reach more than 95%, but if when the waste gas containing Cl, S, N elements, such as the direct combustion will produce the harmful gas such as HCl, SOx, NOx, cause secondary pollution.
Catalytic combustion technology is a new technology developed in recent decades under the trend of environmental protection and energy conservation. Catalytic combustion method is to use different kinds of catalyst, using the principle of the can effectively reduce the reaction activation energy, make the VOCs in the case of low temperature, its completely oxidized to CO2 and H2O, generally when the temperature control in the range of 300 ℃ ~ 450 ℃, the vast majority of hydrocarbons can be in by oxidation, and the removal rate is as high as 95% above, but the catalyst has the certain service life, and life garbage disposal equipment in the process of the use of the catalyst, the exhaust gas catalytic oxidation effect of humidity and types of catalyst has a key effect, if other material in the waste gas, It is likely to cause the poisoning of the catalyst, so the high quality catalyst should have the characteristics of high activation capacity, high thermal stability and hydrothermal stability.
At present, Pd, Pt, Rh, Au, Mn, Co, Ce and Pd, Pt, Rh, Au are precious metals. However, precious metals are expensive and easy to sintering, so developing new composite catalysts is the future research direction.
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