The conventional cost economics and entropy method are used to analyze the economy of oxygen enriched units firing different types of coal. Based on the conventional cost economics method

the power supply cost of burning different kinds of coal is determined by the cost of coal without considering the sale of carbon

while the comprehensive effect of coal cost and carbon sale should be considered when the carbon sale is considered. Based on the entropy method

the economic analysis of the oxygen-enriched unit when burning different coal types is used to calculate the entropy production caused by the internal irreversible loss of the boiler through the entropy production of the combustion process and the entropy production of the heat transfer process. Comprehensive analysis of the two methods shows that burning a single coal type is not the best choice. Mixing different coal types can achieve the best economic performance.