Reduction in CO Emission from Small Reciprocating Engine Operated with Wood Gasifier by Mixture LHV Changing

In order to exchange the wood biomass energy for electric power with small capacity and high efficiency, it is most effective use a reciprocating engine operated gasifier. On other hand, such small-capacity system often installed in urban areas. Therefore, strict emission regulation should be observed. Normally, as low heating value (LHV) of bio-syngas small, stoichiometric mixture achieve maximum density. However, contains much unburned CO. This means that operation shows efficiency can’t observe regulations. this report, mechanism CO considered, method reduce ratio shown experimental results. experiment, commercial (4-stroke, modified single cylinder) used. The bio-syngas, producer gas from fixed bed gasifier, produced by self-made pellet gasifier (fixed bed, auto thermal down-draft). flow rate calculated nitrogen between input air bio-syngas. LHV adjusted city (as an alternative methane) hydrogen. volume exhaust more than 3 v% when excess bio-syngas/air 1.3, less 5.0 MJ/m3-LHV. under mixture, methane 7.0 MJ/m3-LHV was 0.2 v%. fuel combustion not finished chamber. could predicted consideration gap/clearance crevice, temperature boundary layer, quenching distance.