Investigation of Performance and Emission Characteristic of a Reactivity Controlled Compression Ignition Engine Fueled By a Mixture of Diesel and Syngas Derived From Biomass Gasification

Document Type : Research Article

Authors

1 University of Bonab

2 University of Tabriz

3 بناب-فنی و مهندسی- مهندسی مکانیک

Abstract

Recently, low-temperature combustion methods have become very popular in the field of combustion. Reactivity controlled compression ignition is a novel combustion concept with its own advantages. The role of these engines in rectifying the disadvantages of other methods is inevitable. This paper studies the influence of using various types of syngas on combustion and emission characteristics of syngas/diesel reactivity controlled compression ignition engine using Converge CFD. Four types of syngas (ideal syngas composed of solely hydrogen and carbon monoxide, two different types of syngases produced by gasifiers and pure hydrogen) are selected for comparison. Results showed the possibility of using various forms of syngases as low reactivity fuel. Using these kinds of syngases compared with ideal one results in fewer nitrogen oxides at the expense of more soot and it gets worse by increasing the fraction of syngas in premixed air. It shouldn’t be ignored, due to the presence of nitrogen in some types, the engine may suffer from weak combustion and sometimes misfire at low loads as well. Using pure hydrogen, despite its advantages as the main part of syngas, in high quantities, notwithstanding the significant reduction of soot, causes the increase of nitrogen oxides and pressure rise rate amounts which are not desirable.

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