1, the combustion degree is different. The calorific value of high-rank coal combustion in San Pu boiler is the heat released by coal when the steam produced by coal combustion is completely condensed into water, while the low-rank coal combustion is the heat released when the steam produced by coal combustion is not condensed into water.

2. The coal consumption is different. Coal with high fuel consumption has a fast combustion speed because of its strong firepower, while coal with low fuel consumption has a slow combustion speed because of its weak firepower, which can ensure the temperature in the boiler for a long time.