Annual brief overview
Fiscal 2010 Status of Demonstration Test
In FY 2010, we conducted coal-type change tests aimed at expanding the range of usable coal types, and we also carried out tests aimed at improving equipment operability and at countering the problem of heat-transfer pipe clogging in the heat exchanger (SGC) known to occur downstream of the gasifier.
[Coal-Type Change Test (RUN-12)]
- <Test Objectives>
- ・Test the use of sub-bituminous coal types; these types have different characteristics from those the system was designed to use.
- ・Check for the occurrence of blockage in the SGC heat-transfer piping.
- <Test Results>
- ・Confirmed that the plant can run at 60% load (150MW) using Indonesian B sub-bituminous coal.
- ・Succeeded in stopping SGC heat-transfer pipe clogging by running the high-pressure soot-removal device at faster intervals; but use of this faster rate, in turn, raises issues about the device’s durability.
[Operational Improvement Test (RUN-13)]
- <Test Objectives>
- ・Test operation at minimum load and under changing load, with the aim of improving operability.
- ・Check blockages in SGC heat-transfer piping.
- <Test Results>
- ・Minimum load test confirmed that plant delivers stable operation at 90 MW (36%) load, as compared to the previous minimum of 125 MW (50%).
- ・Confirmed operation under load changing at a rate of 3.0%/min (7.5 MW/min).
- ・Checked for clogging of SGC heat-transfer piping when using sub-bituminous (Indonesian A) coal, but no clogging occurred (and there was no need to speed up the interval for the high-pressure soot remover).
