SO2 capture fluidised-bed boilers: re-emission of SO2 due to reduction of CaSO4
SO2 capture fluidised-bed boilers: re-emission of SO2 due to reduction of CaSO4
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DOI：
10.1016/0009-2509(89)85058-4
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发表时间：
1989
影响因子：
4.7
通讯作者：
A. Lyngfelt;B. Leckner
中科院分区：
文献类型：
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作者：
A. Lyngfelt;B. Leckner
在 16 MW 流化床锅炉中研究了石灰捕获硫的方法。脱硫过程，即添加经过煅烧和硫酸化的石灰石，会导致 CaSO/sub 4/ 在床中积聚。 CaSO/sub 4/ 显示在高于 880-890/sup 0/C 的温度和过量空气比为 1.4 时分解为 CaO，随后释放 SO/sub 2/。在 930/sup 0/C 时，以 SO/sub 2/ 形式离开锅炉的硫量是以燃料硫形式添加到锅炉中的硫量的两倍多。 CaSO/sub 4/ 的分解可以通过 CaSO/sub 4/ 与燃烧中间体（例如 CO 和 H/sub 2/）在床的致密（颗粒）相中的反应来解释。结果解释了在流化床锅炉中观察到的硫捕获性能随温度升高而降低的现象，并表明了还原条件的重要影响。对这些现象的更多了解可能会为锅炉设计和运行提供解决方案，从而使石灰石脱硫的使用更加有效。
Sulfur capture by lime was studied in a 16-MW fluidised-bed boiler. The desulphurization process, i.e. the addition of limestone which is calcined and sulphated, results in an accumulation of CaSO/sub 4/ in the bed. The CaSO/sub 4/ is shown to be decomposed to CaO with subsequent release of SO/sub 2/ at temperatures above 880-890/sup 0/C, and at an excess air ratio of 1.4. At 930/sup 0/C the amount of sulphur leaving the boiler as SO/sub 2/ was more than double the amount of sulphur added to the boiler in the form of fuel sulphur. The decomposition of CaSO/sub 4/ can be explained by the reaction of CaSO/sub 4/ with combustion intermediates such as CO and H/sub 2/ in the dense (particle) phase of the bed. The results explain the decrease in sulphur capture performance with increased temperature observed in fluidised-bed boilers and indicate the important effect of reducing conditions. Increased understanding of these phenomena may provide solutions, with respect to boiler design and operation, that make the use of limestone for desulphurization more efficient.