柴油废气重整制氢过程的建模与仿真

Modeling and Simulation of Diesel Reforming Process for Hydrogen Production Based on Exhaust

柴油废气重整是指柴油机废气、水蒸汽和柴油蒸汽在高温低压的环境下,通过催化剂的催化作用发生重整反应,生成氢气、甲烷和一氧化碳的过程。重整后的气体通过EGR装置回到气缸参与燃烧,这样可以有效降低微粒和氮氧化物的排放,同时还能够提高经济性。本文利用Chemkin软件对柴油废气重整制氢的化学反应过程进行建模与仿真。在仿真的过程中利用正庚烷来代替柴油,模拟了正庚烷重整制氢的化学反应过程。根据模拟得到的结果分析了空速比、氧碳比和水碳比对重整制氢反应的影响。

Diesel exhaust reforming is the process,in which a catalytic reaction occurs with its reactants as diesel exhaust gas,water vapor and diesel steam under conditions of high temperature and low pressure to produce H2,CH4 and CO. The reformed gas is recycled to cylinders for combustion. In this way,particulates and NOxemissions are reduced and economy is improved. This paper uses the software Chemkin to model and simulate the chemical reactions of diesel reforming process for hydrogen production based on exhaust. Also,it simulates n- heptane reforming for hydrogen production chemical reaction process by using n- heptane to replace diesel. According to the simulation results,we analyzed the influence of space velocity,oxygen / carbon ratio and water / carbon ratio on the reforming system.