2019 Volume 61 Issue 198 Pages 289-292
To develop an ammonia/natural-gas co-fired gas-turbine which clears environmental regulations, power generation tests have been conducted using a 2 MW class gas-turbine. The test unit consists of an ammonia supply unit, a natural-gas compressor, a gas-turbine, and a NOx removal device. In the ammonia supply unit, ammonia is pressurized in liquid state by a pump and gasified with a hot water evaporator. The high-pressure ammonia gas is supplied to the gas turbine. For the gas turbine, IM270 gas-turbine manufactured by IHI Corporation is used. Only the combustor is modified for ammonia/natural-gas co-firing. In the NOx removal device, a catalyst which used in a natural-gas firing plant is applied. Low-pressure ammonia gas is supplied from the ammonia supply unit as a NOx reducing agent. As a result of the tests, the successful power generation of 2 MW has been demonstrated for the first time with ammonia mixing ratio of 20%LHV. It has further been confirmed that CO2 emissions can be reduced about 23%. Although the NOx concentration at the outlet of the turbine is higher than that of the natural-gas fired gas turbine, it has also been confirmed that the NOx removal device can reduce it to 7 ppm or less.