提高折流板除雾器对细雾滴脱除性能的研究
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摘要
以折流板除雾器为实验平台,采用双面胶法获得小粒径颗粒在除雾器中被捕捉的位置分布,分析折流板除雾器内小粒径雾滴的逃逸原因。对折流板除雾器进行改进,在折流板前加钝体的方法来使除雾器内涡流增强,从而提高对小粒径雾滴的脱除效率,通过数值模拟方法和实验方法对改进前后的除雾器进行对比分析。结果表明:折流板除雾器内弯道处捕获细颗粒的能力略强于直板处,改进之后的加钝体除雾器对30μm以下雾滴的脱除效率有了很大的提高。对于10μm的雾滴,其除雾效率高达90%,对于15μm的雾雾滴,其除雾效率达50%。
This paper uses the baffle demister as the experimental platform,to obtain the position distribution of small particle in the mist eliminator,and analyze the escape causes of fine droplets in baffle demister. The improvement method is put forward as follows. Add a bluff body in front of the baffle plate to enhance the vortex in the mist eliminator,so as to improve the removal efficiency of the small size droplets. Finally,the mist removal efficiency is compared between the numerical simulation and experiments.The results show that baffle mist eliminator capacity in the bend capture of fine particles is slightly stronger than the straight one. With the proposed improvement approach,the removal efficiency of the mist eliminator is greatly improved for the small droplets.
This paper uses the baffle demister as the experimental platform,to obtain the position distribution of small particle in the mist eliminator,and analyze the escape causes of fine droplets in baffle demister. The improvement method is put forward as follows. Add a bluff body in front of the baffle plate to enhance the vortex in the mist eliminator,so as to improve the removal efficiency of the small size droplets. Finally,the mist removal efficiency is compared between the numerical simulation and experiments.The results show that baffle mist eliminator capacity in the bend capture of fine particles is slightly stronger than the straight one. With the proposed improvement approach,the removal efficiency of the mist eliminator is greatly improved for the small droplets.
引文
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[10]朱凯,袁竹林.一种涡流除雾器的实验与数值模拟研究[J].中南大学学报(自然科学版),2018(1):22-30.ZHU Kai,YUAN Zhu-lin. Experimental and numerical simulation of an eddy current demisters[J]. Journal of Central South University(Science and Technology),2018(1):22-30.
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[2]曾庭华,杨华,廖永进.湿法烟气脱硫系统的调试、试验及运行[M].北京:中国电力出版社,2008.CENG Ting-hua,YANG Hua,LIAO Yong-jin. Debugging,testing and operation of wet flue gas desulfurization system[M]. Beijing:CEPP,2008.
[3]林其聪,刘欣,周翔,等.折线型与流线型除雾器性能的数值模拟与分析[J].中氮肥,2013(1):34-35.LIN Qi-cong,LIU Xin,ZHOU Xiang,et al. Numerical simulation on performances of droplet eliminator with serrated vane and corrugated vane[J]. M-Sized Nitrogenous Fertilizer Progress,2013(1):34-35.
[4] BUKHOLZ A. Droplet separation[M]. VCH Verlagsgesellschaft:VCH Publishers,1989.
[5] USHIKI K,NISHIZAWA E,BENIKO H,et al. Performance of a droplet separator with multistage rows of flat blades[J]. Journal of Chemical Engineering of Japan,1982,15(4):292-298.
[6] ESTAKHRSAR M H H,RAFEE R. Effects of wavelength and number of bends on the performance of zigzag demisters with drainage channels[J]. Applied Mathematical Modelling,2015,40(2):685-699.
[7]郝雅洁,刘嘉宇,袁竹林,等.除雾器内雾滴运动特性与除雾效率[J].化工学报,2014,12:4669-4677.HAO Ya-jie,LIU Jia-yu,YUAN Zhu-lin,et al. Movement characteristics of droplets and demisting efficiency of mist eliminator[J].CIESC Journal,2014,12:4669-4677.
[8] GUAN Lei,YUAN Zhu-lin,YANG Lin-jun,et al. Numerical study on the penetration of droplets in a zigzag demister[J]. Environmental Engineering Science,2016,33(1):35-43.
[9]王政允.湿法脱硫系统除雾器除雾特性的实验研究与数值模拟[D].北京:华北电力大学,2009.WANG Zheng-yun. Experimental research and numerical simulation for the demisting characteristic of FGD mist eliminator[D].Beijing:NCEPU,2009.
[10]朱凯,袁竹林.一种涡流除雾器的实验与数值模拟研究[J].中南大学学报(自然科学版),2018(1):22-30.ZHU Kai,YUAN Zhu-lin. Experimental and numerical simulation of an eddy current demisters[J]. Journal of Central South University(Science and Technology),2018(1):22-30.
[11] SMAGORINSKY J. General circulation experiments with the primitive equations:I. The basic experiment[J]. Monthly Weather Review,1963,91(3):99-164.