Abstract: An analysis of scaling on the inside wall of the Circulating Fluidised Beds Flue Gas Desulphurization (CFB-FGD) absorber and its mechanism was carried out. It was found that deposition and agglomeration mainly occurred in a circular high humidity area which was 4 to 5 meters above from the nozzles. Such factors affecting the deposition were studied, including system running conditions, tower makeup, nozzle size, in-tower flow and temperature profiles. The composition of the deposited materials was analysed. It was found that both the composition and the forming mechanism of scaling were far different from the wet FGD, and that scaling was caused mainly by wet ash which was easy to adhere to the wall, and secondly by CaCO₃ which reflected the important role of CO₂ in the scaling process. Finally, approaches to prevent scaling were proposed.For example，a specially designed multi-piped venturi scrubber was installed in order to increase the vertical velocity of the particles.

摘要： 通过对循环流化床烟气脱硫吸收塔黏壁结垢现象进行分析，发现结垢主要发生在浆（水）喷嘴上方4～5 ｍ的环形过湿区域.同时研究了吸收塔结构和喷嘴尺寸，塔内流场和温度场分布以及运行工况对垢的形成过程的影响，并对垢进行了物理化学成分分析.结果表明，吸收塔内的垢无论是组成还是形成机理都与湿法的垢有很大不同，垢的形成以含湿灰的黏壁为主，其次为CaCO₃垢，这表明烟气中CO₂对垢的形成有很大影响.提出了防止循环流化床烟气脱硫结垢的技术措施.