New boiler technology promises cleaner energy -LIVEJOURNAL - 0 views
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shared by Isabella Amber on 11 Jul 12
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Isabella Amber on 11 Jul 12SOUTH KOREA Despite success and promise, the wide-scale deployment of integrated gasification combined-cycle IGCC in South Korea is a few years away. The country has negligible domestic coal production, only possessing 149 million tons of recoverable coal reserves, and must import coal to satisfy demand. Over the years, South Korea has become the world's second-largest coal importer, after Japan. The electric power sector accounts for more than half of coal consumption, though IGCC promises a much cleaner future for coal-fired power plants. While IGCC is in line with South Korea's new and renewable energy program, the country cannot afford to wait for new technology to be employed, nor drastically decrease imports in favor of emissions reduction. Currently, most of the world, including South Korea, employs pulverized-bed boilers PBB in coal-fired power plants and these, along with past types of boilers, have given coal-powered plants very poor reputations. PBB plants require that coal be ground into a fine dust before being fired at high temperatures escaping emissions, such as sulfuric oxides and nitric oxides, are ineffectively collected by scrubbers. Coal plants have the reputation of being among the most pollution-inducing types of power plant. A new boiler technology is rapidly taking hold in the world of coal-derived energy, and this new technology may serve as a more-than-suitable bridge between PBB and IGCC. Circular fluidized-bed combustion, known better as FBC, utilizes fluidized-bed boilers FBB that do not require coal dust or extremely high temperatures. Granulated coal is loaded onto a suspended boiling before held aloft by upward-blowing air currents, tumbling the coal. This tumbling motion allows for more effective combustion and requires lower combustion temperatures. Combustion in FBBs occurs below the threshold temperature at which nitric oxides are produced, thus eliminating the need for that type of emissions capture. Internal limes