Experimental Study on the Reuse of Spent Rapidly Hydrated Sorbent for Circulating Fluidized Bed Flue Gas Desulfurization

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• 作者：Yuan Li ; Kai Zheng ; Changfu You
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：November 1, 2011
• 年：2011
• 卷：45
• 期：21
• 页码：9421-9426
• 全文大小：928K
• 年卷期：v.45,no.21(November 1, 2011)
• ISSN：1520-5851

文摘

Rapidly hydrated sorbent, prepared by rapidly hydrating adhesive carrier particles and lime, is a highly effective sorbent for moderate temperature circulating fluidized bed flue gas desulfurization (CFB-FGD) process. The residence time of fine calcium-containing particles in CFB reactors increases by adhering on the surface of larger adhesive carrier particles, which contributes to higher sorbent calcium conversion ratio. The circulation ash of CFB boilers (伪-adhesive carrier particles) and the spent sorbent (尾 and 纬-adhesive carrier particles) were used as adhesive carrier particles for producing the rapidly hydrated sorbent. Particle physical characteristic analysis, abrasion characteristics in fluidized bed and desulfurization characteristics in TGA and CFB-FGD systems were investigated for various types of rapidly hydrated sorbent (伪, 尾, and 纬-sorbent). The adhesion ability of 纬-sorbent was 50.1% higher than that of 伪-sorbent. The abrasion ratio of 尾 and 纬-sorbent was 16.7% lower than that of 伪-sorbent. The desulfurization abilities of the three sorbent in TGA were almost same. The desulfurization efficiency in the CFB-FGD system was up to 95% at the bed temperature of 750 掳C for the 尾-sorbent.