农业工程学报Issue(9)：42-49,8.DOI:10.3969/j.issn.1002-6819.2014.09.006
排气温度和催化基质特性对柴油机排放的影响
Influence of exhaust temperature and catalytic substrate properties on diesel exhaust
摘要
Abstract
The influence of different temperatures and CDPF (catalyzed diesel particulate filter) substrate properties on NOx reduction and PM oxidation were studied by catalytic experiments, engine bench tests and simulation. From activity evaluation and characterization tests, it was found that owing to the higher mobility of lattice oxygen and the maximum concentrations of oxygen vacancies, La2Cu0.7Fe0.3O4 showed a relatively better catalytic performance between 300°C to 500°C. The NO conversion efficiency on SiC (Silicon carbide) substrate was better than that on cordierite substrate from 350℃ to 500℃ under simulated diesel emission conditions. The engine bench test results showed that NOx conversion efficiency increased from 340℃ to 528℃. Due to higher porosity and stronger thermal diffusion characteristics, the soot oxidation rate and NOx conversion rate on SiC substrate CDPF is better than that on cordierite substrate, under condition of 75%and 90%loads of engine at 1 600 r/min. From simulation researches, CDPF with higher cell density and specific surface-area cell resulted in lower internal mass-transfer resistances, and higher mass-transfer coefficients, which yielded better soot and NOx reduction performances.关键词
柴油机/催化器/温度/排放/基底特性/氮氧化物/碳烟Key words
diesel/catalytic/temperature/exhaust/substrate property/NOx/soot分类
能源科技引用本文复制引用
陈朝辉,张韦,陈贵升,沈颖刚..排气温度和催化基质特性对柴油机排放的影响[J].农业工程学报,2014,(9):42-49,8.基金项目
National Natural Science Foundation of China (No.51276128), Yunnan Provincial Science and Technology Department(2013FB017), Yunnan Provincial Department of Education (KKJA201256011), Kunming University of Science and Technology (KKSY201256142) （No.51276128）
