Anthony E J, Berry E E, Blondin J, Bulewicz E M, Burwell S
CANMET Energy Technology Centre, Natural Resources Canada, 1 Haanel Drive, Ottawa, Ontario, Canada K1A 1M1.
Waste Manag. 2003;23(6):503-16. doi: 10.1016/S0956-053X(02)00117-4.
The combustion of high-sulphur coal demands the reduction of sulphur emissions. The sorbent most often used in sulphur capture technology is calcium-based. Ashes from technologies such as circulating fluidized bed combustion (CFBC), therefore, contain high calcium levels. The use and disposal of these ashes poses challenges, because of highly exothermic reactions with water, high-pH leachates, and excessive expansion of solidified materials. This paper looks at the potential of two post-combustion ash treatment processes, CERCHAR hydration and AWDS disposal, in solving these challenges. A high-sulphur coal-derived CFBC ash is examined, after CERCHAR hydration treatment, in conjunction with a conventionally hydrated ash, in a range of chemical, geotechnical and utilization scenarios. The ashes are used to make no-cement and roller-compacted concrete as well as Ash Water Dense Suspensions (AWDS). The solidified mortar paste from no-cement concrete is subjected to an extensive geochemical examination to determine how solidification progresses and strength develops, from a chemical point of view.
高硫煤燃烧需要减少硫排放。硫捕获技术中最常用的吸附剂是钙基吸附剂。因此，循环流化床燃烧（CFBC）等技术产生的灰分含有高钙含量。由于这些灰分与水发生高度放热反应、产生高pH值渗滤液以及固化材料过度膨胀，其使用和处置带来了挑战。本文探讨了两种燃烧后灰分处理工艺，即CERCHAR水化和AWDS处置，在解决这些挑战方面的潜力。对经过CERCHAR水化处理的高硫煤衍生CFBC灰分与传统水化灰分进行了研究，考察了一系列化学、岩土工程和利用场景。这些灰分用于制造无水泥和碾压混凝土以及灰水浓悬浮液（AWDS）。从化学角度对无水泥混凝土的固化砂浆进行了广泛的地球化学检查，以确定固化过程和强度发展情况。
