Coal Gasification Technology
Features of Coal Gasification Technology
Contributing to the Prevention of Global Warming
If high-efficiency IGCC and IGFC were introduced into the United States, China and India – the countries that account for over 70% of CO2 emissions originating from coal-fired thermal power generation around the world – there would be a reduction effect significantly greater than the total annual emissions of Japan (approx. 1.4 billion tons).
Note: This is an estimate we have made with reference to the Long-term Energy Supply and Demand Outlook Subcommittee Document (5th Meeting)
Increase in the Coal Varieties Used
Coal gasification excels at using low-grade coal(sub-bituminous coal and brown coal), that is not suitable for PCF plant. Therefore, in addition to leading to the effective use of resources, it is also possible to expect economic benefits.
Source: WEC World Energy Resources 2013 Survey
Efficient CO2 Capture
The pre-combustion capture method is applied in IGCC. The treated gas has a high pressure, low volume and high CO2 concentration. This means that there is a low level of energy loss and efficient capture is possible.
Reduction in the Volume of Ash
Coal ash is melted in the gasifier and discharged as slag (glass-like solidified matter). Therefore, the volume of ash is reduced by about half compared to PCF ash.We plan to re-use the slag as roadbed material and similar.
Features of Oxygen-blown Syngas
Syngas is characterized by abundant combustive components (CO and H2) in the gas and by having a high calorific value.It is possible to expect that this will have even higher efficiency in the future in conjunction with an increase of the gas turbine combustion temperature.