IGCC (Integrated Coal Gasification Combined Cycle Power Plants)

The IGCC is a highly efficient and environmentally friendly next-generation thermal power system achieved through coal gasification.

The significantly enhanced power generation efficiency and environmental performance of IGCC are achieved by combining coal gasification and the Gas Turbine Combined Cycle (GTCC) system. Large-type IGCC can improve power generation efficiency by approximately 15% while reducing CO2 emissions compared with conventional coal-fired thermal power systems.

MHI Group is the world-leading provider of IGCC technology and retains two types of coal gasification technology, namely, air-blown and oxygen-blown technologies. Due to its ability to effectively utilize coal resources as well as protect the environment, IGCC has been gaining world-wide interest, and the demand for the system is expected to grow further.

Air-blown IGCC systems use air for coal gasification. First, coal is processed into coal gas in the gasifier, where the air is used as the gasification agent. Coal gas undergoes desulfurization and de-dusting treatment in the gas clean-up unit to comply with the standards for gas turbine fuel and exhaust gas. The “cleaned gas” is supplied to the GTCC facility.

The GTCC facility burns the “cleaned gas” as fuel to spin the gas turbine to generate power. Furthermore, the heat from the exhaust gas is recovered at the heat recovery steam generator (HRSG) and is exchanged with water, making steam, which in turn is used by the steam turbine for additional power generation.

Placed downstream from the gasifier, the heat exchanger cools the hot coal gas. The steam generated at that time is merged into the HRSG and used for power generation by the steam turbine, further enhancing efficiency in power generation.

Oxygen-blown IGCC systems use oxygen for coal gasification. First, coal is processed into coal gas in the gasifier, where oxygen is used as the gasification agent. Coal gas undergoes desulfurization and de-dusting treatment in the gas clean-up unit to comply with the standards for gas turbine fuel and exhaust gas. The “cleaned gas” is supplied to the GTCC facility.

The GTCC facility burns the “cleaned gas” as fuel to spin the gas turbine to generate power. Furthermore, the heat from the exhaust gas is recovered at the heat recovery steam generator (HRSG) and is exchanged with water, making steam, which in turn is used by the steam turbine for additional power generation.

Placed downstream from the gasifier, the heat exchanger (or the syngas cooler (SGC)) cools the hot coal gas. The steam generated at that time is merged into the HRSG and used for power generation by the steam turbine, further enhancing efficiency in power generation.

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