摘要污泥燃料是一种灰分和挥发分含量极高，固定碳含量较低的低热值燃料，化学链气化是一种获取较高品质的生物质合成气，气化过程无需消耗富氧气体的新型气化技术，而赤铁矿作为铁矿石的一种，具有良好的反应性能和循环再生能力。在单批次进料小型流化床上，开展基于赤铁矿载氧体的污泥化学链气化实验，考察了有无载氧体、气化反应温度、水蒸气气氛、载氧体晶格氧与污泥含碳比等参数对该过程气化特性的影响，同时检验铁矿石载氧体连续运行的循环反应性能，并探究其长期运行的可能性。结果表明：载氧体的存在能够促进污泥燃料的气化反应；较高的气化温度和水蒸气浓度有利于增大碳转化率与合成气份额；载氧体中晶格氧比例的增大有利于增大碳转化率却不利于合成气的产生；铁矿石作为一种潜在的载氧体可连续应用于污泥化学链气化过程中。30246
关键词 污泥燃料 化学链气化 铁矿石 载氧体 合成气 气化特性
毕业论文设计说明书外文摘要
Title Experiments on Chemical Looping Gasification of Sewage Sludge Using Hematite as Oxygen Carrier
Abstract
Sewage sludge is a low heating value fuel with higher ash and volatile content, but lower fixed carbon proportion. Chemical looping gasification (CLG) is a promising combustion technology with getting high quality biomass syngas and without consuming nutrient-rich gas. Hematite has good response performance and recycling capacity as a kind of iron ore. CLG of sewage sludge with iron ore as an oxygen carrier was investigated in a single fluidized bed. The sludge fuel gasification characterization was assessed by using oxygen carrier or not, gasification reaction temperature, water vapor atmosphere and the ratio of O/C. The cycling reaction of oxygen carrier was also tested to explore the possibility of long-running. Results indicated that the sewage sludge conversion reaction was remarkably accelerated by the presence of oxygen carrier. High gasification temperature and water vapor concentration was in favor of increasing the carbon conversion and fraction of synthesis gas. The increase of lattice oxygen leaded to high carbon conversion while to the disadvantage of producing synthesis gas. As a potential oxygen carrier, iron ore can be continuously applied to process of CLG with sewage sludge.
Keywords sewage sludge fuel chemical-looping gasification iron ore
oxygen carrier synthesis gas gasification characterization
目 次
1 绪论 1
1.1 引言 1
1.2 污泥的来源与处理 2
1.2.1 污泥的来源 2
1.2.2 污泥的处理技术 2
1.2.3 污泥气化技术 3
1.3 化学链气化技术 4
1.3.1 化学链气化理论分析 5
1.3.2 化学链气化实验平台 6
1.3.3 天然载氧体的选取 7
1.4 本文研究目的和研究内容 7
2 实验部分 9
2.1 实验材料 9
2.1.1 固体燃料 9
2.1.2 载氧体原料 10
2.2 实验系统 10
2.3 实验步骤和工况 11
2.3.1 实验步骤 11
2.3.2 实验工况 12
2.4 实验数据评估 12
3 实验结果和讨论 14
3.1 载氧体对污泥气化过程的影响 14 基于铁矿石载氧体的污泥化学链气化实验研究:http://www.youerw.com/huaxue/lunwen_25881.html