Denitration equipment | How to control excessive nitrogen oxides in diesel generator set exhaust?
The diesel oil used by the generator is high molecular hydrocarbon. During the operation of the generator, when it is completely burned in the combustion chamber, only carbon dioxide and water vapor will be generated, but the products that are not completely burned mainly include carbon monoxide (CO), sulfur dioxide SO2, nitrogen oxides NOx and particulate PM hydrocarbon HC. Most of them are harmful, or have a strong irritating odor, and some have carcinogenic and mutagenic effects, so they are listed as harmful emissions. CO2 is also one of the pollutants. At the beginning of the industrial era, with the massive use of petroleum fuels, CO2 in the atmosphere gradually increases, causing the current greenhouse effect and attracting global attention.
At present, the most common device used to treat nitrogen oxides of generator sets is SCR denitration system, which controls NOx in diesel tail gas, uses the mass ratio of NH3 or urea of 32.5% as a reducing substance, and uses NH3 to reduce NOx to N2 and H2O under a certain temperature and catalyst.
For the surplus NH3, a certain proportion of ammonia escape catalyst (ASC) is coated on the end of SCR carrier to absorb and react the escaping ammonia, so as to meet the environmental control standard.
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