This paper presents the combustion characteristics of a light-duty direct-injection diesel engine operating on dimethyl ether (DME). The indicated pressure diagrams and injector needle lifts are recorded and the combustion characteristics are demonstrated and compared with those of an engine operated on diesel fuel. The experimental and calculated results show that the DME engine has a longer delay of injection and duration of injection, a lower maximum cylinder pressure and rate of pressure rise, as well as a shorter ignition delay compared with those of a diesel engine. The DME engine has a low mechanical load and combustion noise, a fast rate of diffusion combustion and a shorter combustion duration than that of a diesel engine. It has the ideal pattern of compression ignition engine heat release.
In this paper, a new method of determining boiler soot-blowing steam flow rate was proposed. By this method, three tests of unaccounted-for leakage rate of the unit thermal system should be conducted without soot blowing, and the unaccounted-for leakage ratio difference between arbitrary two tests should be within 0.10%. The average value of three unaccounted-for leakage flow rate test results was used as the final result of unit unaccounted-for leakage flow to determine the flow rate of soot-blowing steam. During the test period of power output and heat rate, the calculation of soot blowing steam flow rate took account of the result of unaccounted-for leakage tests and the water level change of condenser hot well, deaerator and boiler drum.
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