A coke deposition self-removal TBCC thermal management with multi-catalyst coating

How to mitigate coke and improve heat sink is the critical factor for thermal management system of turbine-based combined cycle (TBCC). A novel thermal management method using multi-stage coating structure to mitigate coke and improve heat sink is developed in this study. The multi-stage coating structure includes catalytic steam reforming (CSR) and catalytic steam gasification (CSG) catalyst coatings. Coke is removed by CSG, which provides coke self-removal. In addition, the CSG is a strong endothermic reaction, which enables the increase of the chemical heat sink. The numerical study for the multi-stage coating structure was conducted using a heated channel. Results indicate that the multi-stage coating structure can reduce coke by 50% and increase chemical heat sink by 50%, when the mass ratio of secondary steam injection is 2%. In addition, it is found by a comparative study that the increase of secondary steam addition is helpful to remove coke and increase chemical heat sink. Both coke production and chemical heat sink are significantly affected by the rate distribution of CSG. The optimal performance of multi-stage coating structure can be obtained by properly regulating rate distribution of CSG.