Development of a Non-Catalytic System for Reducing Nitric Oxide in Diesel Exhaust Using Methylamine as the reductant

研制了以甲胺（CH_3NH_2）为还原剂的柴油机排气中一氧化氮的选择性非催化还原体系。采用电加热石英流反应器对部分柴油机尾气进行了实验，结果表明，在反应器温度为673 ~ 800 K、[CH_3NH_2] / [NO]摩尔比为1.0的条件下，NO还原率可达80%以上。针对柴油机全尾气进行了实验研究。在这些实验中，高速、单缸、水冷、自然吸气、四循环、冲程876cc的直喷式柴油机作为试验发动机，使用电控汽油喷油器在排气管注入40%的水溶甲胺。结果表明，在没有氨和甲胺泄漏的情况下，当摩尔比为3.0时，NO还原率可达70%左右。进一步表明，甲胺与废气完全混合，在摩尔比为1.0时，NO还原率可达80%以上。

Selective non-catalytic system for reducing nitric oxide in diesel engine exhaust using methylamine (CH_3NH_2) as the reductant has been developed. The results obtained at the experiments for a part of diesel exhaust using a electrically heated quartz flow reactor show that more than 80% NO reduction ratio is achieved in the reactor temperature range of 673 K to 800 K with a molar ratio [CH_3NH_2] / [NO] of 1.0. Experiments targetting whole diesel exhaust has also been carried out. In those experiments, high speed, single cylinder, water cooled, naturally aspirated, four cycle, DI diesel engine having 876 cc of stroke volume was used as a test engine and 40% water solved methylamine was injected at a exhaust manifold using an electrically controlled gasoline injector. The results show that about 70% of NO reduction ratio is achieved at the molar ratio of 3.0 without the leak of ammonia and methylamine. It is further shown that more than 80% NO reduction ratio at the molar ratio of 1.0 can be attained bythe complete mixing of methylamine and exhaust.