Abstract
The suitable bed material is important to inhibit ash-related problems including agglomeration and slagging in furnace and fouling on tail heated surfaces during coal gasification in fluidized bed....
Highlights
Coal is still the most important source of energy in China
Five bed materials including quartz, kaolin, corundum, sludge ash, and phosphate rock were investigated in lab-scale test apparatuses to verify their feasibility as the bed material on preventing slagging and fouling during Zhundong coal gasification in FB
(1) The theoretical calculation and SEM-EDS analysis illustrate that the used bed materials effectively captured alkaline earth metal (AAEM) species in Zhundong coal, and their capturing capacities varied little with Zhundong coal properties
Summary
Coal is still the most important source of energy in China. With the continuous consumption of coal, the discovery and exploitation of Zhundong coalfield, the largest integrated coalfield in China with an estimated reserve of 390 Gt (Zhang et al, 2013), will offer a strong support for China’s coal industry. Due to the high Na content in Zhundong coal, severe ash-related problems including slagging and fouling greatly limited this coal utilization (Dai et al, 2015; Wang et al, 2015). When Zhundong coal was used in industrial coal powder boilers, severe slagging usually occurred in the high-temperature radiation zones (1500–1700C), and the convection zones were mostly covered by fouling (Dai et al, 2013; Wu et al, 2016). The too high content of alkali and alkaline earth metal (AAEM) elements in Zhundong coal has been considered as the main reason for slagging and fouling (Li et al, 2015, 2016a, 2016b). The flues will be jammed without effective actions, resulting in unscheduled shutdown
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