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| Effect of biodiesel mixed with ammonia on the combustion and emission performance of homogeneous charge compression ignition engine |
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| KeyWord:biodiesel ammonia gas homogeneous charge compression ignition combustion emission |
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| Abstract: |
| In order to improve the comprehensive combustion quality and performance of the fuel, further reduce the emission of harmful substances and mitigate the greenhouse effect, based on the theoretical basis of combustion kinetics and chemical reaction mechanism, the Chemkin software was used to fully integrate the mechanism of biodiesel substitute and ammonia gas, simulate and calculate the combustion and emission values of 5 groups of fuels with the ammonia gas molar ratio of 0, 5%, 10%, 15% and 20% respectively in homogeneous charge compression ignition engine mode. The effects and change rule of different mixing ratio on engine combustion and emission were compared and analysed. The results showed that with the increase of ammonia gas ratio, the ignition delay period of fuel was shortened, the maximum combustion temperature in the cylinder increased, and the exhaust temperature decreased. In terms of emission, NOx emission increased, while CO2, CO and total hydrocarbon (THC) emissions decreased significantly. The optimal ratio of biodiesel blended with ammonia gas was 20%, and under this condition, the engine power decreased by 12 percentage, and the unit power emission ratio of NO increased by 0.003 kW-1, while the unit power emission ratios of CO2 and THC decreased significantly, which were 0.01 kW-1 and 0.001 3 kW-1 respectively. In conclusion, biodiesel blended with ammonia gas significantly improves combustion and reduces emissions, and has good application prospect. |
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