筛板脱硫塔气液流动及运行参数的影响分析
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摘要
基于筛板式脱硫喷淋塔的结构特点,研究了烟气流速、浆液循环量、液滴粒径和喷嘴形式对雾滴携带特性、筛板的整流效果、系统压损的影响。结果表明,烟气流速增加到3.6 m/s,液滴被携带的作用明显增加,烟气流速增加,除雾器入口的雾滴浓度明显增加,系统压损增大;而循环量对1 300μm雾滴携带没有明显影响,循环量增加,系统和整流层的压损明显增大;液滴粒径越小,其携带作用越弱,1 300μm以上液滴几乎没有被携带出脱硫吸收塔,而800μm以下液滴携带作用明显增强。液滴分级粒径由50μm增加到1 900μm,其系统压损由2 349 Pa降到975 Pa,除雾器段压损由361 Pa降到67 Pa,液滴粒径对塔内系统压损影响较大。对安装有五层喷淋层的吸收塔,在四层以上安装双向双头喷嘴对除雾器入口的雾滴浓度有明显增加,而三层以下是否安装对雾滴携带无明显作用,同时其携带作用增强,筛板的整流效果减弱。
Based on the structural characteristics of the sieve plate desulfurization spray tower, the influence of the flow velocity of flue gas, slurry circulation, droplet size and nozzle form on the carrying characteristics of fog drops, the rectifying effect of the sieve plate and the pressure loss of the system were studied. The results show that, with the increase of flue gas velocity to 3.6 m/s, the effect of droplet carrying is significantly increased, and with the increase of flue gas velocity, the concentration of fog droplet at the inlet of the defogger is significantly increased, and the pressure loss of the system is increased. The circulation volume has no obvious influence on the droplet diameter to 1 300 microns, but the pressure loss of the system and the rectifier layer increases obviously with the increase of the circulation volume. The smaller the droplet size, the weaker the effect of carrying and the drops over 1 300 microns have hardly been carried out the desulphurization absorber, while the drops below 800 microns have significantly increased their carrying capacity. Meanwhile droplet grading particle size has increased from 50 microns to 1 900 microns, pressure loss of the system decreased from 2 349 Pa to 975 Pa, pressure loss of the atomizer section decreased from 361 Pa to 67 Pa and droplet particle size has great influence on pressure loss of the system inside the tower. For absorption tower with 5 spray layers installed, the installation of bi-directional double-head nozzle above 4 layers significantly increases the concentration of fog drops at the entrance of the defogger, while the installation of bi-directional double-head nozzle below 3 layers has no obvious effect on the carrying of fog drops, and its carrying effect is enhanced, thus the rectifying effect of sieve plate is weakened
Based on the structural characteristics of the sieve plate desulfurization spray tower, the influence of the flow velocity of flue gas, slurry circulation, droplet size and nozzle form on the carrying characteristics of fog drops, the rectifying effect of the sieve plate and the pressure loss of the system were studied. The results show that, with the increase of flue gas velocity to 3.6 m/s, the effect of droplet carrying is significantly increased, and with the increase of flue gas velocity, the concentration of fog droplet at the inlet of the defogger is significantly increased, and the pressure loss of the system is increased. The circulation volume has no obvious influence on the droplet diameter to 1 300 microns, but the pressure loss of the system and the rectifier layer increases obviously with the increase of the circulation volume. The smaller the droplet size, the weaker the effect of carrying and the drops over 1 300 microns have hardly been carried out the desulphurization absorber, while the drops below 800 microns have significantly increased their carrying capacity. Meanwhile droplet grading particle size has increased from 50 microns to 1 900 microns, pressure loss of the system decreased from 2 349 Pa to 975 Pa, pressure loss of the atomizer section decreased from 361 Pa to 67 Pa and droplet particle size has great influence on pressure loss of the system inside the tower. For absorption tower with 5 spray layers installed, the installation of bi-directional double-head nozzle above 4 layers significantly increases the concentration of fog drops at the entrance of the defogger, while the installation of bi-directional double-head nozzle below 3 layers has no obvious effect on the carrying of fog drops, and its carrying effect is enhanced, thus the rectifying effect of sieve plate is weakened
引文
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[2]丁开翔,郭永红,王勇强,等.不同喷淋层布置的脱硫塔流场优化数值模拟[J].电站系统工程,2016(1):24-27.
[3]何仰朋,陶明,石振晶,等.喷淋脱硫塔内除雾器运行特性[J].中国电力,2015,48(7):124-128.
[4]谭学谦.超大型机组湿法脱硫吸收塔喷淋系统设计优化[J].南方能源建设,2015,2(Z1):98-100.
[5]程峰.液桩冲击塔湿法烟气脱硫的试验和理论研究[D].杭州:浙江大学,2005.
[6]孟建国,安德盛,孟庆庆,等.超低排放改造技术路线解析[J].科技传播,2016,8(8):157-161.
[7]柯昌华,陈捷.吸收塔浆液再分布装置在WFGD升级改造中的应用[J].电力科技与环保,2017(3):28-30.
[8]操斌,张增利,刘天福.燃煤电厂烟气治理超低排放技术路线[J].中国氯碱,2017(3):36-38.
[9]ALDO MALVIN , ANDY CHAN, PHEI LILAU. CFD study of distillation sieve tray flow regimes using the droplet size distribution technique [J]. Journal of the Taiwan Institute of Chemical Engineers, 2014(45):1354-1368.
[10]于海东.基于CFD的WFGD烟气脱硫技术效率分析[J].科技与创新,2016(17):155.
[11]吴其荣,杜云贵,喻江涛,等.火电厂氨泄漏扩散特性模拟研究[J].环境科学与技术,2014(2):155-159.
[12]金定强.脱硫除雾器设计[J].电力环境保护,2001,17(4):16-18.
[13]赵毅,华伟,王亚君,等.湿式烟气脱硫塔中折线型挡板除雾器分离效率的数值模拟[J].动力工程,2005,25(2):293-297.
[14]石振晶,陶明,何育东,等.喷淋脱硫塔内除雾器性能数值模拟[J].热力发电,2016,45(3):92-97.
[15]陈湘文.筛板式喷淋塔脱硫脱硝性能试验研究[D].杭州:浙江大学,2008.
[16]高国华,李鑫钢,陈建民,等.不同开孔方式的大孔筛板干板压降研究[J].现代化工,2010,30(Z1):1-3.