Abstract: Blast furnace (BF) slag, one of main byproducts in steelmaking industry, is of high sensible heat and contains some metal oxides, which both can be utilized and is very beneficial to catalytic converse of tar and low carbon hydrocarbons for production of hydrogen-rich gas. Based on this idea, to realize heat recovery of BF slag and utilization for biomass catalytic gasification to generate hydrogen-rich gas, a heat recovery and catalytic conversion system was proposed in this paper. The liquid-solid transition state particles are firstly made by centrifugal granulation from liquid BF slag and then taken them as heat carrier for biomass gasification in a moving-bed reactor, and due to catalysis of multi-metal oxide the selectivity of production hydrogen is improved. Ultimately, the low-grade waste heat of liquid BF slag is translated into the high grade hydrogen energy. To examine main factors influencing gas composition and product distribution, gasification experiments are conducted. The results show that BF slag shows a good catalytic activity for tar cracking and methane reforming. With increase of BF temperature and decreases of particle size the tar content in gasification product decreases and the quality of hydrogen-rich gas improves. At the optimum conditions: BF slag particle size below 2 mm as heat carrier and catalyst, the gas yield can reached 1.65 m³·kg^-1, hydrogen content 53.22% and tar content only 2.52%.

Key words: biomass, gasification, blast catalysis, furnace slag, hydrogen production

摘要： 高炉渣是钢铁生产过程的主要副产品，是一种多元金属熔体，具有大量显热并能促进焦油及甲烷等低分子碳氢化合物的催化转化。鉴于此本文提出通过干法离心粒化技术将液态炉渣制备成液-固过渡态的高温炉渣颗粒，作为生物质气化热载体，利用炉渣中多种金属矿物对大分子的解构、断键和分解的催化作用，提高气化反应的选择性，实现对炉渣显热的回收和转换，将低品位的液态炉渣余热转换成高品位的氢能。通过气化实验，对影响气化产物分布及气体组成的主要因素进行考察，结果表明：高炉渣在促进焦油分解和碳氢化合物重整方面表现出良好的催化性能，增加热载体炉渣颗粒温度，减小颗粒粒径能够减小炉渣表面积炭，降低气化产物中焦油产率和提升富氢气体品质，在最佳工况下（选用粒径小于2 mm，温度为1200℃的高炉渣颗粒作为热载体），气化产物中焦油含量仅为2.52%，气体产率达到1.65 m³·kg^-1，富氢气体中H₂含量可达53.22%。

关键词: 生物质, 气化, 催化, 高炉渣, 制氢