Integrated Gasification Combined-Cycle Power Plants

Metrics for sustainability analysis of post-combustion abatement of CO2 emissions: Microalgae mediated routes and CCS (carbon capture and storage)

“…The H 2 to CO ratio can be altered by downstream processing, mainly WGS (water gas shift) reaction, which produces CO 2 while enriching the gas in H 2 , requiring CO 2 capture. Syngas production and CO 2 capture are mature technologies, and energy generation with syngas (enriched in hydrogen) bears resemblance to the IGCC (Integrated Gasification Combined Cycle) power generation [21], where coal is gasified and water gas shifted to produce power with reduced carbon emissions.…”

Practical Issues

“…Furthermore, not only the water but also the coal is preheated to above 300°C -a feature that is not possible with gasifiers using dry-coal feeding, because there the coal particles will become sticky, which will interfere with the fluidization ( Holt, 2001b ).…”

“…A further proposal for reducing the efficiency disadvantages of slurry-feed systems is the use of supercritical CO 2 as transport medium ( Holt, 2001b ).…”

A Computational Workbench Environment for Virtual Power Plant Simulation

“…Use of a "cold" slurry feed requires that heat generated within the gasifier from the fuel conversion process be used to vaporize the liquid water used to transport the coal. As noted in [Holt, 2001a], pre-heating the slurry before injection into the gasifier should increase the thermal efficiency of the gasifier and thereby provide a means to increase the carbon conversion within the gasifier, or allow reducing the size of the gasifier if the same carbon conversion is desired. For systems with cold or warm gas clean-up, the slurry pre-heat can potentially be performed by passing the hot syngas exiting the gasifier through a heat exchanger that pre-heats the incoming cold slurry prior to injection to the gasifier.…”

“…In contrast, the gasifiers developed by Shell and by groups in Japan employ a dry feed system. Potential advantages to a dry feed system include greater cold gas efficiency and reduced oxygen requirements [Holt, 2001a]. The dry feed could be obtained by using nitrogen or possibly carbon-dioxide as a carrier gas.…”