A high temperature is required for the reforming reaction. Thus, the reformer outflow has an extremely high temperature and needs to be cooled before the FT process. We built three heat exchangers to gradually cool down the reformer outflow, while the recycled heat is used to pre-heat the mixed stream to the gas form (>100 ℃), an intermediate temperature for pre-reformer (~ 500 ℃) and a high temperature for reformer (700 ~ 1000 ℃).