旋风-喷射鼓泡塔的结构特征与性能分析

针对传统鼓泡塔不能处理含尘量大烟气的缺陷,运用喷射鼓泡工艺与旋风除尘器的原理与优势设计了新型鼓泡塔——旋风-喷射鼓泡塔,利用CFD(computational fluid dynamics)技术对其气相分布特性、气固分离性能、除雾器效率进行了分析,并依据受力平衡得出除雾环设计的积分方程。结果表明:蜗壳切入式入口使入口舱区域烟气实现均匀性分布,气固两相在外筒中实现分离,对5~100 μm与1~10 μm粒径粉尘的去除率分别为99.43%和53.70%;加环旋流板除雾器使雾滴去除率从98.39%提升至99.08%,雾滴分离的临界粒径从0.047 mm降至0.021 mm,雾滴临界粒径范围内,加环旋流板除雾器的雾滴去除率为96.20%。

Structure characteristics and performance analysis of a novel cyclone-jet bubbling tower

Based on the principles and advantages of jet bubbling reactor and cyclone separator, a novel type of bubbling tower, cyclone-jet bubbling tower, was designed aiming at the disadvantages of traditional bubbling tower which could not be applied to the flue gas contained large dust content. The distribution of gas phase, the separation property of gas-solid and the efficiency of demisting were analyzed by computational fluid dynamics (CFD) technology. The design integral equation of demisting ring was obtained according to the principle of force balance. The results showed that the uniform distribution of flue gas in the entrance cabin area and the separation of gas-solid at the external tower were achieved by the structure of volute cut-in entrance. The removal efficiency of 5-100 μm and 1-10 μm size dust were 99.43% and 53.70%, respectively. The demisting efficiency was improved from 98.39% to 99.08% by the structure of demisting ring. And the critical particle size of droplet was decreased from 0.047 mm to 0.021 mm. Under the condition of the critical droplet diameter, the demisting efficiency of the swirl plate demister with the demisting ring was 96.20%.