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以木片炭和木屑混合物(WCC)、稻秆(RS)、桑树枝炭(MBC)和竹炭(BMC)为原料,利用携带流再燃脱硝试验装置,在NO初始体积分数为1×10-4～3×10-4条件下,研究了生物质炭再燃脱硝特性,分析了再燃燃料种类、再燃燃料粒径、再燃区反应温度t2、停留时间τ等因素对再燃脱硝效率的影响.结果表明:对于4种试验用生物质,WCC再燃脱硝效果最好,其脱硝效率为63.4%,RS和BMC次之,MBC没有脱硝效果;随着再燃燃料粒径的减小,再燃脱硝效果趋好;随着NO初始体积分数的减小,再燃脱硝效率降低,当NO初始体积分数低于1×10-4时,RS再燃脱硝效率反而升高;当t2=950～1 250℃时,WCC再燃脱硝效率随再燃区温度的升高而提高;在τ=0.4～0.8s时,随着τ的缩短,生物质再燃脱硝效率下降,当τ=0.4s时,再燃脱硝效率小于10%.为了保证一定的再燃脱硝效率,建议WCC再燃区反应温度和停留时间分别保持在1 150℃和0.8s.
Using WCC, RS, MBC and BMC as raw materials, the nitrification and denitrification experiments were carried out. The initial NO concentration was 1 × 10-4 ~ 3 × 10-4, the effect of reburning denitrification on biomass charcoal was studied, and the effects of reburning fuel type, reburning fuel particle size, reaction temperature t2 in the reburning zone, residence time τ on the reburning denitrification efficiency were analyzed.The results showed that for the 4 kinds of test biomass, WCC reburning denitration best, the denitrification efficiency of 63.4%, followed by RS and BMC, MBC no denitrification effect; as the reburning fuel particle size decreases, reburning denitration effect is getting better; With When the initial volume fraction of NO is less than 1 × 10-4, the denitration efficiency of RS reburning increases instead. However, the efficiency of reburning denitrification of WCC decreases with the increase of the initial volume fraction of NO (subscript n) = 950 ~ 1 250 ℃ When τ = 0.4-0.8s, the denitrification efficiency of biomass reburning decreases with the decrease of τ, and the denitration efficiency of reburning is less than 10% when τ = 0.4s. In order to ensure a certain reburning Denitrification efficiency, it is suggested that the reaction temperature and residence time in WCC reburning zone should be kept at 1 150 ℃ and 0.8s respectively.