With the national development and use of clean energy, under the strategic background of “double carbon” goal, this paper proposes a combined carbon capture power plant and glycerol hydrogen-methane (C3H8O3-H2-CH4) (Integrated Energy Systems, IES). First of all, by exchanging the heat of high temperature waste heat resources and carbon dioxide to realize the transformation of carbon capture power plants, the problem of wasting waste heat resources in carbon capture power plants is solved. Secondly, the IES model of the improved carbon capture power plant with CHC device is constructed, and optimized with the target function of the minimum sum of energy purchase cost, operation and maintenance cost, carbon transaction cost, outsourcing coal and glycerol cost. Finally, by studying the relationship between the relevant gas purchase constraint and the methane production of the CHC device, the strategy of selling the methane gas needed by the excess system is obtained. The example analysis shows that the joint use of the modified carbon capture power plant and CHC device can reduce the gas consumption and carbon emission to the system, which is both low carbon and economical.