Effect of common-rail pressure and natural gas proportion on performance of dual fuel diesel engine
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The International Maritime Organization is tightening regulations on air pollution and greenhouse gas emission from ships. One of the resolution strategies for control is the use of the dual fuel diesel engine with natural gas, and it has been widely researched. In this study, a dual fuel diesel engine of 2000cc with common-rail system was adopted and the effects of common-rail pressure and mixing ratio of diesel oil and natural gas on the combustion and emission characteristics of the engine were investigated. A three-step common-rail pressure test was set with increments of 10 MPa and a four-step natural gas ratio test was set under two engine loads. As common-rail pressure was increased by 10 MPa, nitrogen oxides increased by 0.2 g/kWh. As natural gas ratio was increased, the specific energy consumption and nitrogen oxides decreased but carbon monoxide and total hydrocarbon emissions increased. COVIMEP increased with increasing mass fraction of natural gas at low load, which could be attributed to diffusion combustion at low loads. The effect of the COVIMEP value on the stability of operation was negligible.
Abstract
The International Maritime Organization is tightening regulations on air pollution and greenhouse gas emission from ships. One of the resolution strategies for control is the use of the dual fuel diesel engine with natural gas, and it has been widely researched. In this study, a dual fuel diesel engine of 2000cc with common-rail system was adopted and the effects of common-rail pressure and mixing ratio of diesel oil and natural gas on the combustion and emission characteristics of the engine were investigated. A three-step common-rail pressure test was set with increments of 10 MPa and a four-step natural gas ratio test was set under two engine loads. As common-rail pressure was increased by 10 MPa, nitrogen oxides increased by 0.2 g/kWh. As natural gas ratio was increased, the specific energy consumption and nitrogen oxides decreased but carbon monoxide and total hydrocarbon emissions increased. COVIMEP increased with increasing mass fraction of natural gas at low load, which could be attributed to diffusion combustion at low loads. The effect of the COVIMEP value on the stability of operation was negligible.
참고문헌 (12)
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