Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10145370 | Fuel | 2019 | 19 Pages |
Abstract
Biogas with methane proportions in the range 24-68% could be utilized without significant changes in efficiency and emissions till a biogas energy share (BGES) of 60% when the injection timing of diesel was suitably adjusted. Higher than normal methane concentrations (normal: 51-53%) only elevated the NO levels with little impact on efficiency. However, when low proportions of methane were used NO could be controlled effectively particularly at low BGES. Simulation studies indicated that this reduction in NO is due to the lowered in-cylinder temperature rather than the reduced concentration of oxygen as a result of increased CO2. When the proportion of methane was decreased from 68% to 24% the start of injection of diesel had to be advanced by 3â¯Â°CA (at a BGES of 60%) to compensate for the increase in ignition delay and reduction in combustion rate. With pilot injection there was a reduction in smoke emission because of improved charge homogeneity due to the split injection process. However, post injection which is generally effective in diesel engines was not advantageous in the biogas diesel dual fuel (BDDF) mode because of the diffusion combustion the post injected fuel undergoes.
Keywords
EGTCA50ECUBMEPRCCIHRRTHCIMEPHCCICH4MBTH2SppmFSNvolume percentNDIRMBDEGRCNGDAQBDDFNOxReactivity controlled compression ignitionCOVflame ionization detectorHomogenous charge compression ignitionOxides of nitrogenOxygenEfficiencybrake mean effective pressurePilot injectionPost InjectionMaximum rate of pressure riseMaximum Brake TorqueFIDExhaust gas temperatureDual fuel enginesDouble pulseCarbon dioxideparticulate matterCombustion efficiencyBrake thermal efficiencyCrank AngleAlternative fuelsHydrogen sulphideData acquisition systemSOCStart of combustionFilter Smoke NumberCoefficient of varianceICTparts per millionMethanecarbon monoxideHeat release rateIndicated mean effective pressureNitric oxideHydrogenhydrocarbonEngine control unitBTESingle pulseCO2total hydrocarbonkilowattcompressed natural gasexhaust gas recirculation
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
K. Abdul Rahman, A. Ramesh,