To evaluate the feasibility of coal derived oil, we conducted tests on accelerating ability from standstill for a car with a spark-ignition engine and exhaust emissions from a diesel-powered car.
Two types of fuels were used. One type of fuel had properties equivalent to motor gasoline (JIS K 2202, Grade 2) and the other to gas oil (JIS K 2204, Grade 2). Two kinds of test fuels (G-A and G-B) equivalent to gasoline were prepared by mixing 20‰ of refined oil (A) and 20‰ of refined oil (B) with usual motor gasoline blend stocks, respectively. The oil A was highly hydrotreated and catalytically reformed naphtha de-rived from brown coal, and the oil B from bituminous coal. Two kinds of test fuels (GO-D and GO-E) equivalent to gas oil were prepared by mixing 20% of refined oil (D) and 20‰ of refined oil (E) with a gas oil, respectivly. The oils D and E were highly hydrotreated oil from brown coal but had different boiling ranges. We also used com-mercial gasoline (G-C) and commercial gas oil (GO-F) for reference. Research octane numbers of G-A, G-B and G-C were 91.2, 90.6 and 90.5, and cetane numbers of GO-D, GO-E and GO-F 48, 50 and 55, respectively.
The test car A with a spark-ignition engine used was in conformance with the Japanese emissiom standard for gasoline-fueled passenger cars of 1978, and the test car B with a diesel engine with the Japanese emission standard for diesel-powered passenger cars of 1987. Each car was equipped with an automatic transmission system.
In the accelerating ability test from standstill for the test car A, the running time over 400m on a flat and straight test course was measured. Running times of the fuels G-A, G-B and G-C were 18.80, 18.80 and 18.72sec, respectively. From these results, we concluded that there is no difference in accelerating ability among the fuels contain-ing the coal-derived oil and commercial gasoline.
The exhaust emissions, CO, HC, NOx, particulate matter (PM) and soluble organic fractin (SOF) in PM from the test car B, fueled with GO-D, GO-E or GO-F, were mea-sured under the condition of the Japanese diesel 10 mode test and of constant engine speeds at idling, 20, 40 and 60km/h. A slight increase in mass emissions of CO, HC and NOx by mixing the coal-derived oil with commercial gas oil was noticed under diesel 10mode condition, but these mass emissions were considerably below allowable limits of emission standard. Therefore, it was concluded that the fuel containing coal derived oil would produce no serious problems in terms of exhaust emissions.