Dry CFB-FGD By-Product Utilization - International Prospectives

摘要

Circulating fluidized-bed flue gas desulfurization (CFB-FGD) process is an emerging dry FGD technology. In the United States (US), several CFB-FGD systems have installed recently in coal-fired power plants and industrial boilers after the process was successfully demonstrated in the AES Greenidge station with support of the US Department of Energy (DOE) in 2008. In China, the CFB-FGD technology has been widely applied to coal-fired power plants (up to 660 MW), sintering plants and other large industrial installation since 2004. There are many advantages of the CFB-FGD technology over other FGD systems. However, the utilization of CFB-FGD by-product has been developed slowly and could become the major barrier for further implementation of the technology. CFB-FGD by-product is a new type of by-product. Its compositions and properties are often site-specific and can be affected strongly by coal types, flue gas compositions, unit operating conditions and others factors. In this paper, compositions and properties of CFB-FGD by-products from different sources in China and US will be compared and discussed. The recent development in by-product utilization, especially in China, will also be outlined and discussed. In addition, an international collaboration program between research and industrial organizations in US and China to advance CFB-FGD by-product utilization will be illustrated.