Supercritical Circulating Fluidized Bed Boiler
The fluidized combustion technology options continue to evolve. According to the World Energy Council , a major efficiency-enhancing measure for second-generation pressurized fluidized bed combustors is the integration of a coal gasifier (carbonizer) to produce a fuel gas. This fuel gas is combusted in a topping combustor and adds to the combustor’s flue gas energy entering the gas turbine, which is the more efficient portion of the combined cycle. The topping combustor must exhibit flame stability in combusting low-Btu gas and have low-NOx emission characteristics. To take maximum advantage of the increasingly efficient commercial gas turbines, the high-energy gas leaving the topping combustor must be nearly free of particulate matter and alkali/sulfur content. Also, releases to the environment from the pressurized fluid bed combustion system must be essentially free of mercury, an air pollutant for which federal regulations are in limbo. CFB research and development also focus on reductions of both cost and carbon dioxide emissions, so new sorbents are being evaluated. Sorbent utilization has a major influence on operating costs, and carbon dioxide emissions streams can be used in the production of alkali-based sorbents.
China has successfully mastered the supercritical CFB load during wet - dry supercritical transition point conversion and particularity, breaking 600MWe Supercritical Circulating Fluidized Bed Boiler and starting to debug, unit rational operation, performance and the test key technologies to achieve a demonstration project evaluation unit 168 hours operation, and formed a unit to start commissioning technical guidelines. Not only the boiler performance is superior to foreign-related technology, power generation efficiency subcritical CFB height of about 4 percentage points and the steam and combustion parameters fully meet the design expectations, but also China clean coal technology completely independent intellectual property rights , the world's largest capacity, highest steam parameters and the power generation efficiency of circulating fluidized bed power generation technology. All these marks that the circulating fluidized bed combustion and engineering technology of the Chinese has reached the world advanced level.
