Status of Generation Technology

A large number of small (100-300 MWe) subcritical coal-fired power plants provide the dominant share of China's current coal generation capacity. These plants are generally older, and have low thermal efficiency [9]. Fleet turnover of the coal fired capacity, and addition of large more efficient units have improved overall generation efficiency of coal-fired thermal power capacity in China. In the recent past, net plant efficiency has significantly improved, from under 30% in 1997 to over 34% in 2007 (Fig. 11.6). The gain in plant efficiency is a result of closing down of small inefficient units (about 14 GWe of capacity), and addition of large more efficient units, and the use of advanced technologies, such as supercritical (SC) and ultra-supercritical (USC) boilers [10].

Current Chinese fleet of coal-fired generation plants is dominated by subcritical power plants with an efficiency range of 30-36% [9]. By 2007, China had added about 8.8 GWe of ultra-supercritical generation capacity (7 x 1,000 MW and 3 x 600 MW),

Year

Fig. 11.6 Improvement of standard coal consumption rate and efficiency of coal-fired generation capacity in China (1990-2007) (Source: Zhao et al. [10])

Year

Fig. 11.6 Improvement of standard coal consumption rate and efficiency of coal-fired generation capacity in China (1990-2007) (Source: Zhao et al. [10])

with an efficiency of about 43%, and is expected to add significant amount of new capacity including supercritical and ultra-supercritical power plants [10].

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