固定床生物质热解气化过程N迁移实验研究
Nitrogen transformation with biomass pyrolysis and gasification in a fixed-bed reactor
查看参考文献17篇
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文摘
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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,NH_3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NH_3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%。 |
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其他语种文摘
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Fuel-N conversion during pyrolysis/gasification of wheat straw (MG), wood dust (SGF) and pine wood (SM) at 550 -950℃ and under Ar/CO_2/CO_2 + H_2O surroundings in a fixed-bed reactor is discussed in this paper. Experiment results show that the selectivity towards gas N(HCN + NH_3) is increased with the increasing temperature and the main gas-N product is NH_3. At the temperature range of 550 - 950℃, the conversion of fuel-N to HCN exhibits a steady increment and the conversion of fuel-N to NH_3 can reach the maximum values at 900℃. The changes of atmosphere have not led to a significant influence on the fuel-N conversion of SGF, however,the introduction of water in the gasification greatly improves the production of NH_3 at 850 - 950℃. A much larger amount of fuel-N of SGF is released than that of MG and SM. The content of char-N for SGF is far lower than the fuel-N. In contrast, the content of char-N for MG is substantially equal to the fuel-N but the content of char-N for SM is significantly greater than the fuel-N. The amount of gas-N is surged while char-N is sharply dropped with the increasing of temperature during pyrolysis/ gasification of three kinds of biomass. When the temperature reaches 900℃,the percentage of fuel-N converted to volatile-N is larger than 75.5%, among which the amount of gas-N accounts for about 26.7% -76.6%. |
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来源
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现代化工
,2016,36(11):116-120 【核心库】
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DOI
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10.16606/j.cnki.issn0253-4320.2016.11.027
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关键词
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生物质
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热解气化
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HCN
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NH_3
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半焦N
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地址
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1.
中国科技大学化学与材料科学学院, 中国科学院可再生能源重点实验室, 安徽, 合肥, 230026
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中国科学院广州能源研究所, 中国科学院可再生能源重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-4320 |
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学科
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能源与动力工程 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5846612
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