In pre-combustion capture technology IGCC (Integrated Gasification Combined Cycle) technology: first cleaning gas into the coal gasification energy, thereby to separate CO2 before combustion, does not enter the combustion process. Moreover, CO2 concentration and the pressure will therefore increase the separation more convenient to use, it is the cheapest running costs of capture technology, the prospects for the academic optimistic. The problem is that conventional power plants can not use this technology, but need to re-build specialized IGCC power plant, whose construction cost is more than double the existing conventional power plants.