申武投资初期安装了一个热交换器，将进入炉内的空气预热，降低了客户的燃料成本。
Shenwu puts up the initial investment to install a heat exchanger that preheats the air going into the furnace, slashing the client's fuel costs.
感热的气体被用来给预热和干燥的燃料。
The sensible heat given by gas is used to preheat and dry fuel.
另外，火能预热更高山上的燃料，因为烟和热量顺着那个方向上升的。
Additionally, the fire is able to preheat the fuel further up the hill because the smoke and heat are rising in that direction.
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