Research On Novel Power System With Steam-methane Reforming

Coal fuels account for the greatest part of fossil fuels in China, about 70% of the generated power come from coal fuels. But the energy conversion efficiency of coal fuels is rather low in our country and the incorrect utilization leads to serious pollution to the environment. Otherwise, predictions show that natural gas consumption will increase largely in our country, this will change the makeup of the energy consumption and reduce the pollution to environment caused by the incorrect utilization of coal fuels. Considering the two factors mentioned above, the main study of this dissertation analyzes the performance of a novel dual-fuel combined cycle with methane/steam reforming. The processes of methane/steam reforming, combustion of coal and combined cycle are integrated in this thermal cycle. The chemical energy of coal is transformed into the chemical energy of syngas through methane/steam reforming, and then the syngas fuel is consumed by the combined cycle to generate power. The main contents are as follows:Firstly, an overall simulation of the natural gas and steam reforming is carried out using the commercial Aspen Plus code, the results are validated by comparing them with the existing engineering datum, and a further research and discussion are made, which is about the potential of applying reforming to the power system: the exergy loss in combustion process is the biggest one in the whole power system, but the indirect release of chemical energy based on the natural gas and steam reforming can reduce the exergy loss in the combustion process.The second is to analyze the characteristics of the dual-fuel system: the reforming of the methane and the steam is a strong endothermic process. The thermal energy required for the methane reforming is provided by the combustion of the...