Browsing by Author "Silveira, Raymond Francis"

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    An experimental study of diesel-natural gas dual fuel engine.
    (University of Dar es Salaam, 2018) Silveira, Raymond Francis
    This study is aimed at conducting a technical, environment, and economic assessment for the utilization of Natural Gas-Diesel dual fuel engine technology in Tanzania. The experimental study of Diesel-Natural Gas Dual Fuel Engine was carried out by injecting liquefied petroleum gas into the engine at various proportions and engine loads. Performance parameters were recorded for 100% diesel operation and at various Diesel-LPG rates, these were then used to model the combustion of an equivalent rate of compressed natural gas flow to observe the dual fuel engine’s performance, calculate its subsequent carbon dioxide emissions and estimated financial savings obtained through its usage in dual fuel engines. Natural gas flow rate and Engine load influenced the engine power output and Brake Thermal Efficiency; the Brake Thermal efficiency increased with load however decreased with increasing ratio of natural gas. The maximum diesel substitution ratios at which the engine could perform satisfactory was 77 % and 57% occurring at a load of 2kg and 10kg respectively. At higher loads the percentage increase in CO2 emissions of Diesel-Natural gas dual fuel engines decreased as compared diesel engines, at the maximum natural gas ratio the percentage increase in CO2 emissions decreased down to -6 %. The financial saving from Diesel substitution by Natural gas in dual fuel engines for Tanzania reveals that at 2015 market prices the percentage financial savings rose to a maximum of 21 % at low loads, 19% at medium loads, and 1% at high loads.