Author:
Liang Liwen,Li Pengfei,Zu Daohua,Hu Fan,Liu Zhaohui
Abstract
Abstract
New experimental and numerical results for NO reduction of CH4-H2 mixture were obtained in a 0-dimensional jet stirred reactor (JSR), the effects of the following four factors are considered: temperature(T): 800-1300 K; equivalence ratio(φ): 0.5-2.5; proportions of H2:CH4 in fuel: 0:6, 1:5, 3:3 and 5:1 (expressed in terms of FUEL-CH4, FUEL-1:5, FUEL-3:3 and FUEL-5:1, respectively); CO2 concentration in dilution gas: 0, 30% and 60% (expressed by terms D-N2, D-30%CO2 and D-60%CO2, respectively). Compared with pure CH4, mixing with H2 weaken the NO reduction in high temperature region, The NO reburning reduction rate of FUEL-3:3 increases first and then decreases with the increase of φ. The strongest reduction effect is obtained at T=1300 K and φ=1.2, and the reduction efficiency is about 70%. The NO reburning reaction was obviously inhibited by increasing CO2 concentration, but the effect was limited when the CO2 concentration reached a certain level. The reburning effect of FUEL-CH4, FUEL-1:5, FUEL-3:3 is approximative, but the reburning effect of FUEL-5:1 is significantly inhibited by high proportions of H2:CH4.