生物质基础组分化学链燃烧特性实验研究

Experimental research on the chemical looping combustion characteristics of biomass basic components

中文关键词: 化学链燃烧  生物质基础组分  铁矿石  载氧体

英文关键词: chemical looping combustion  biomass basic components  iron ore  oxygen carrier

中文摘要:

      在间歇式小型流化床上, 以天然铁矿石为载氧体, 实验研究了木质素、 纤维素、 壳聚糖3 种常见生物质 基础组分的化学链燃烧特性。 主要考察了组分性质和反应温度对载氧体微观形貌及成分变化等影响特性, 以 及气相产物生成、碳转化率、碳捕集率和碳转化速率变化规律。 结果表明, 提高反应温度会使气相产物被载氧体 进一步氧化从而释放更多热量, 但也导致载氧体出现一定程度的烧结和熔融的现象, 从而抑制载氧体的反应活 性。 在不同反应温度下3 种组分的碳捕集率排序为:f (木质素) >f (壳聚糖) >f ( 纤维素) 。 当反应温度提高 到950 ℃ ,3 种生物质基础组分的碳捕集率和碳转化率均得到了提高。 其中木质素的化学链燃烧效果最好, 碳捕集率达到了90.58% , 基本实现了碳元素的完全反应, 明显优于壳聚糖的80.86 % 和纤维素的66 .98% 。

英文摘要:

      Naturaliron ore was used as the oxygen carrier to study the chemical looping combustion characteristics ofthethree common basic components of biomass, lignin, cellulose, and chitosaninin an intermittent small-scale fluidized bed. The influences of component properties and reaction temperatures on oxygen carrier microstructures and evolution characteristics, as well as gaseous products, carbon conversion rates, carbon capture rates, and carbon conversion rates were mainly investigated. The results show that increase of the reaction temperature prompts the oxidation of gaseous products by oxygen carrier and release of more heat, however it also can cause a certain degree of sintering and melting of oxygen carrier, leading to inhibition of oxygen carrier reactivity. The order of carbon capture rates of the three components at the reaction temperatures is: f(lignin) > f(chitosan) > f(cellulose) . As the reaction temperature increases to 950 ℃ , the carbon capture rate and carbon conversion rate of the three basic components of biomass are improved. Lignin has the best chemical looping combustion effect With the carbon capture rate 90.58% , which basically realizes the full reaction of carbon elements, and it was significantly betterthan80.86% of chitosan and 66.98% of cellulose.