Water usage at IGCC plants

Gasification plants can be designed to reuse their waste water, and thus use much less water than a traditional pulverized coal plant. This reduction is due to the fact that much of the IGCC output is from combustion processes, which are much less water-intensive than steam turbines used in traditional coal plants.

 

In a 2007 DOE/NETL analysis on water use for electric generation, IGCC plants had the lowest water consumption and withdrawal of the plant types analyzed. Even with added CO2 capture, the IGCC plant water usage was comparable or lower than the PC plants without CO2 capture systems. While a CO2 capture system will increase the water use of a plant regardless of plant type, pre-combustion capture (as can be done for gasification systems) requires significantly less additional water usage than post-combustion capture. See here