Development of a Complex Catalytic Conversion System for Internal Combustion Engines Fueled with Natural Gas

Abstract

The paper related to developing of a new gas engines with high energy efficiency and meeting future emission standards. It is necessary to develop complex exhaust gas aftertreatment systems to treat the toxic components efficiently when the engine runs on stoichiometric and lean mixtures. It is proposed to use new combination of three-way catalyst for working on stoichiometric mixtures and a selective catalytic reduction system for NO x aftertreatment on lean mixtures. Experimental studies have shown that efficient (over 90%) conversion of gas engine exhaust components takes place in the range of air excess ratio from 0.99 to 1.01. Theoretical studies have shown that the highest efficiency of nitrogen oxides reduction is achieved in the temperature range of 400...500°C and reaches over 97%.

Designing the shape of the combustion chambers for gas engines converted on the basis of the diesel engines

“…A possibility to improve the efficiency of gas engines (reequipped based on diesel engines) by using the Miller cycle was considered in article [10]. The possibility of a higher fuel economy was shown when utilizing stochiometric mixtures and at the same time geometric compression degree as that in the diesel engine.…”

“…Article [11], which is a continuation of work [10], analyzed and compared the complexity and cost of the systems for neutralizing the exhaust gases from the diesel engines, as well as from petrol and gas ICEs. It was shown that for these engines to meet the pollutant emission norms within Euro 4 to Euro 6, the complexity and cost of treatment systems substantially increases.…”