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%.