THE PRODUCTION OF STALK CHAR AS PULVERIZED COAL INJECTION OF BLAST FURNACE

摘要

The blast furnace is the oldest metallurgical process in commercial use. It has gone through great improvements during the last decades and new important modifications are still foreseen. The huge amount of coal and coke needed for reduction of iron ore and energy is resulting in emissions of carbon dioxide that have to be strongly reduced to meet the requirement of minimizing the carbon footprint. Sustainable biomass production and its use for energy generation does not lead to net build up of CO_2 levels in the atmosphere because CO_2 released during its combustion is sequestrated during new growths. Furthermore, use of biomass can lead to net CO_2 emission reduction if substituted for fossil fuels;;the potentials of such substitution and GHG emission reduction in any country would depend on its sustainable biomass production potential. In this paper, the pyrolysis of three stalk to produce stalk char as pulverized coal injection of Blast furnace was studied to estimate the effect of pyrolysis conditions on product yield, calorific value and proximate analysis. Heating rate and pyrolysis temperature were the main experimental parameters. According to the test, when the heating rates were at 5°C/min, 10°C/min and 15°C/min, the low heating rate reacted more thoroughly, got high yield and kept more energy. As the pyrolysis temperature rising;;namely 200°C, 300°C, 400°C and 500°C;;the fixed carbon and gross calorific value were increasing to be 68% and 24.72 MJ/Kg respectively, but the yield was decreasing.