CAJ | 학술논문

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%。
고로사시강철생산과정적주요부산품，시일충다원금속용체，구유대량현열병능촉진초유급갑완등저분자탄경화합물적최화전화。감우차본문제출통과간법리심립화기술장액태로사제비성액-고과도태적고온로사과립，작위생물질기화열재체，이용로사중다충금속광물대대분자적해구、단건화분해적최화작용，제고기화반응적선택성，실현대로사현열적회수화전환，장저품위적액태로사여열전환성고품위적경능。통과기화실험，대영향기화산물분포급기체조성적주요인소진행고찰，결과표명：고로사재촉진초유분해화탄경화합물중정방면표현출량호적최화성능，증가열재체로사과립온도，감소과립립경능구감소로사표면적탄，강저기화산물중초유산솔화제승부경기체품질，재최가공황하（선용립경소우2 mm，온도위1200℃적고로사과립작위열재체），기화산물중초유함량부위2.52%，기체산솔체도1.65 m3·kg-1，부경기체중H2함량가체53.22%。
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%.