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利用管式炉反应器对麦秆(MG)、砂光粉(SGF)、松木(SM)3种生物质进行热解/气化实验,研究了温度(550~950℃)、气氛(Ar、CO_2、CO_2+H_2O)对3种生物质热解/气化过程中N气体(HCN和NH_3)及半焦N生成比例的影响。实验结果表明,3种生物质在Ar下热解气相N产物(HCN+NH_3)生成比例随温度增加而上升且以NH_3为主;550~950℃下HCN的转化率一直增加,NH3的转化率在900℃达最大值;改变气氛对SGF含N气体的转化率影响不明显,H_2O的加入在850~950℃下可促进NH3生成;SGF的燃料N较MG和SM更容易释放,SGF半焦N的质量分数明显低于原料N,MG半焦N与原料N的质量分数基本相等,SM半焦N质量分数比原料显著增加;3种生物质热解气化过程半焦N逐渐减少,气相N逐渐增加,900℃时3种生物质燃料N转化为挥发分N的质量分数大于75.5%,挥发分N中气相N占_26.7%~76.6%。
Pyrolysis / gasification experiments were carried out on the biomass of straw (MG), sanding powder (SGF) and pine wood (SM) by using tubular furnace reactor. The effects of temperature (550-950 ℃) CO_2, CO_2 + H_2O) on N gas (HCN and NH_3) and semi-coke N formation ratio during pyrolysis / gasification of three kinds of biomass. The experimental results showed that the formation ratio of HCN + NH 3 in the pyrolytic N products (HCN + NH 3) increased with the increase of temperature under the Ar concentration and dominated by NH 3; the conversion of HCN increased at 550-950 ℃, the conversion of NH 3 And reached the maximum at 900 ℃. The effect of changing atmosphere on the conversion of SGF containing N was not obvious. The addition of H 2 O promoted the formation of NH 3 at 850-950 ℃. The fuel N of SGF was more easily released than MG and SM, N mass fraction was significantly lower than the raw material N, MG semi-coke N and the mass fraction of raw material N is basically equal, SM semi-coke N mass fraction was significantly increased than the raw material; three kinds of biomass pyrolysis gasification process semi-coke N gradually decreased, gas phase N increased gradually, the mass fraction of N converted to volatile matter N was more than 75.5% at 900 ℃, and the N content in volatile N accounted for 26.7% ~ 76.6%.