LHV effect on reducing exhaust NOx and CO from a reciprocating engine operated with bio-syngas

When converting electricity by general-purpose reciprocating engines, regulations on emission composition are set in all regions. These regulations apply even in the case of using bio-syngas, a renewable energy source, as a fuel. Therefore, the conditions in which NOx and CO satisfy the environmental regulation values are experimentally examined by varying the LHV in this paper. The nitrogen, hydrogen, and methane ratios in the bio-syngas were varied to change the LHV. The results are as follows: 1) The NOx volume fraction in the exhaust gas was higher than the NOx regulation value in all cases of operation with any gases. After-treatment systems should be installed to purify the exhaust gases. 2) Under the lean-burn condition, the CO volume fraction in the exhaust gas is negligibly small and satisfies the environmental regulation value.