| Popis: |
The Integrated Coal Gasification in Combined Cycle technique allows a come back to coal: starting with a Combined Cycle plant, it is possible to add gasification units several years later and hence to switch from natural gas to coal. However, the price to pay will be capital cost but also a loss of performances of the resulting plant compared to a genuine Integrated Coal Gasification in Combined Cycle. In this paper, we investigate the phasing option starting with a new Combined Cycle plant, optimized on natural gas operation, and ending with an Integrated Coal Gasification in Combined Cycle plant. We calculate the performances of the resulting plants with four types of gasifiers based on Texaco, Shell, Dow and British-Gas-Lurgi processes. We then compare the performances of these four plants with the performances of new Integrated Coal Gasification in Combined Cycle plants, optimized on coal operation and fully integrated, comprising the same four gasifiers. We finally compare the loss of performances in the four cases and recommend the selection of a gasifier type for such a phasing strategy. |
