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This paper proposes a selective non-catalytic reduction (NOx) system for diesel engine with 40% methylamine (CH3NH2) aqueous solution as the reducing agent, and carries out an engine bench test. According to the results, CH3NH2 began to separate NH2 out at the exhaust temperature of 250~300℃, the NOx reduction rate of the SNCR system increased rapidly with the increase of the engine load and it reached 70% at the exhaust temperature of 470℃. On this basis, this paper establishes a database containing 13 kinds of physical parameters of methylamine, uses CHEMKIN to establish the reduction process of the gas phase chemical reaction mechanism and imports the file into the general CFD software FireV2011 to numerically simulate the reduction process of the SNCR system. The results indicate that NOx is fully reduced in one rreaction cycle starting from the injection of the reducing agent.
40% methylamine aqueous solution, selective non-catalytic reduction (SNCR)，NO，numerical simulation
This paper is supported by the Research and Development Programs of Shandong Province (2016GGX103036), Jinan Science and Technology Development Plan (201102026).
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