The gas turbine will serve as a core component of a 50MW blast furnace gas- (BFG-) fired gas turbine combined cycle (GTCC) power generation plant under construction by TISCO in the city of Taiyuan, Shanxi Province. BFG-fired GTCC power plants use exhaust gas from blast furnaces to meet part of a steel plant’s electricity requirements.
BFG is a by-product of iron-ore reduction in a blast furnace. Many ironworks worldwide use the waste gas as fuel to generate electricity, but uptake of the technology has been slow in China. Many Chinese ironworks have traditionally adopted conventional power generation system, using boilers and steam turbines. Recently, however, there is a growing trend toward more effective GTCC power generation, relying on BFG-fired gas turbines, says MHI.
Because BFG – containing carbon monoxide (CO) and hydrogen (H2) – only has about one-tenth of the calorific value of natural gas, stable combustion of BFG-fired gas turbines requires sophisticated technology. MHI pioneered the development of BFG GTCC technology in the 1980s and has already delivered many systems to iron and steel manufacturers in Japan and abroad, enjoying nearly a 60% share of world’s BFG gas turbine market. This latest order is MHI’s 6th similar contract in China.
The TISCO power plant project is being financed in conjunction with a yen loan for the Taiyuan Environmental Improvement Project. The M251S gas turbine will be manufactured and supplied by MHI’s Takasago Machinery Works. The steam turbine will be supplied by Hangzhou Steam Turbine Co., Ltd., and the heat recovery steam generator (HRSG) will be procured by TISCO separately.
The Chinese steel manufacturing industry has been expanding its output every year, supported by the robust growth of the domestic economy. In 2006 production of raw steel in China reached nearly 420 million tons, an 18.5% increase over the previous year.