分会场

内燃机碳中和与排放控制

摘要

Hydrogen possesses several advantageous combustion properties that can be leveraged to enhance the combustion and emissions characteristics of compressed natural gas (CNG)-fueled spark ignition (SI) engines. This present work investigates the effect of hydrogen and Exhaust gas recirculation (EGR) addition on the performance and emissions of a compressed natural gas internal combustion engine under low load and low-speed conditions. The experiment was conducted to analyze the effect of different hydrogen ratios (0-50%), EGR ratios (0-20.6%), Spark timing (4-44 oCA bTDC) with a low load and low speed under stoichiometric conditions. There are several parameters have been investigated as: torque, brake thermal efficiency, NOx, CO2, CO, THC, CH4 to calculate the suitability of laboratory-based CNG SI engine. The peak torque is increased by 1.18% with the count of 20% hydrogen in comparison to CNG fuel with 2oCA advancement in maximum brake torque. The maximum brake thermal efficiency increases by 3.17% to increase 6% exhaust gas recirculation and also 4oCA retard the maximum brake torque. CO2, CO, THC and CH4 emissions are reduced by 1.5%, 5.7%, 6.1% and 5.4% by the addition of 10% hydrogen fraction respectively and NOx is decreased 5.3% by increasing the 2.2% exhaust gas recirculation. The heat release rate is also investigated which is increased by 1.3% by increasing the 10% hydrogen fraction in CNG and 3.2% reduced by increasing the 2.2% EGR and increased by 4.2% by advancing the spark timing from 14o to 20o before the top dead center.

关键词

Hydrogen-enriched compressed natural gas (HCNG),;Brake thermal efficiency;Engine emissions;EGR fraction;Heat release rate

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