其次，他们正在用工业垃圾和废弃轮胎代替目前正在使用的煤炭和焦炭等矿物燃料。
Second, they are replacing fossil fuels such as coal and coke with alternatives such as farm waste or used tyres.
焦炭是一种很经济的燃料。
在将固体燃料转换为合成气时，二氧化碳也会与正在形成的焦炭反应。
The CO2, as it's converting a solid fuel to a gas, also has the ability to react with the carbon char that is forming.
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