Japanese utilities to test “low emissions” coal plant

Oxygen-blown IGCC transforms coal via gasification into synthetic gas for a combined cycle, enabling CO2 capture and lower emissions. CoolGen's Hiroshima pilot by Chugoku and Electric Power Development targets near-zero greenhouse gases.

Japanese utility companies Electric Power Development and Chugoku Electric Power have announced they are to join forces to test a new "low emissions" clean coal technology as part of a new $1.1 billion project.

The two power firms announced that they have formed a 50:50 joint venture, CoolGen Corp, with the aim of starting trials of oxygen-blown integrated gasification combined cycle (IGCC) technology by 2017. The utilities claim that it produces 10 per cent lower carbon dioxide emissions than conventional coal-burning methods.

The second phase of the project, expected to start in 2021, will test CO2 separation and recovery methods, or carbon capture technologies, which are intended to combine with the IGCC process to reduce greenhouse gas emissions from the facility to zero.

IGCC technology turns coal into synthetic gas, while removing particulate matter such as mercury and sulphur. The gas is used to fuel a combined cycle system, in which it powers a turbine generator before the waste heat is captured to power a second steam turbine system.

Supporters of the technology argue that this clean coal approach is highly efficient and can deliver significant cuts in emissions compared with conventional coal-burning plants.

A CoolGen test facility is to be built on the site of Chugoku's power plant in Hiroshima prefecture, aligning with commercial coal gasification in Japan efforts, which integrates coal-fired gas turbine generating equipment and steam generating apparatus. Chugoku has agreed to purchase electricity generated from the CoolGen facility.

CoolGen's technology was researched and developed by Electric Power Development, with the government providing financial backing. It differs from air-blown IGCC methods being tested by other Japanese utilities – developed in conjunction with Mitsubishi Heavy Industries – which are believed to have higher investment and cleanup costs than the oxygen-blown process.

However, developers of air-blown IGCC technologies claim that oxygen-blown gasifiers require large amounts of power to produce oxygen, as cleaner coal technology in China continues to move forward, therefore resulting in a less-efficient process than the air-blown technologies.

Related News

• Electricity Forum News

• Power Generation News