coal selection criteria for industrial pfbc firing project 3.2 - CCSD

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“Coal Selection Criteria for Industrial PFBC Firing” fusion temperature advantage of Australian coals (Stubington, Wang et al. 1998). The use of dolomite sorbent instead of limestone could also raise the melting point of alkali eutectics in the filter cake (Stubington 1997). Another solution was to use coal ash instead of limestone for maintaining bed height. High ash coals were found to build bed height faster (Sudhakar Gupta, Mandal et al. 1995). This method was not very effective in capturing sulfur, however this should not be a major problem as Australian coals produce low level of sulfur emissions (Peeler, Lane et al. 1990). Alternative methods to maintain bed height, such as zero-stage cyclone or selection of coal with appropriate ash particle size distribution, have been investigated. They should be encouraged to maintain the advantage of Australian coals. Experiments with two Australian coals were conducted at Wakamatsu. Ashes from one caused high stationary pressure drop in the ceramic tube filter (Iwamoto, Ishom et al. 2001). This coal was found to produce very fine ash (
“Coal Selection Criteria for Industrial PFBC Firing” • Operating procedures: start-up, shut-down and load-following procedures affected the concentration and temperature profiles which must be compatible to materials limitations. 3.6.1 Gas Turbine Blade Erosion Gas turbine blade erosion and corrosion is an acute problem in PFBC plants, decreasing the turbine efficiency and blades durability and increasing the risk of turbine operation (Li, Chuming et al. 1991). Although the hot gas exhausted from the furnace has been desulfurized and cleaned, a certain quantity of corrosives and particulates entering the gas turbine is inevitable. The erosion rate was found to increase substantially when cyclone clogging occurred (Li, Chuming et al. 1991). Ash particles may erode the turbine blades. The main component of the ash that is responsible for the erosion is fine quartz particles. Quartz particles are very hard and angular, so that the very fine particles passing through the cyclones are abrasive to the metal blades. Most of the large quartz particles are removed by the cyclone, only the fine particles (
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coal selection criteria for industrial pfbc firing project 3.2 - CCSD

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