魏新,宁翔,茹宇,漆聪,肖海平
WEI Xin,NING Xiang,RU Yu,QI Cong,XIAO Haiping

• 1:大唐环境产业集团股份有限公司
• 2:华北电力大学能源动力与机械工程学院

摘要(Abstract)：

超低排放和灵活性发电背景下,脱硫系统串联吸收塔液位波动大,液位和水平衡难以有效控制。基于某600 MW机组脱硫系统实际运行工况,分析了负荷及烟温改变时吸收塔蒸发量的变化趋势,研究脱硫系统一二级塔的用水分布规律。通过计算分析发现:随着烟气量的减少,脱硫塔内总蒸发量大幅度减少,其中一级塔蒸发水量下降明显,二级塔下降较少。烟气温度对塔内蒸发量影响明显,烟气温度越高塔内蒸发量越大,但二级塔内蒸发量变化较小。随着负荷降低,二级塔除雾器冲洗水将超过蒸发水量,导致液位失衡。因此,采取二级塔低液位运行以及适当延长除雾器冲洗周期等措施,有利于缓解吸收塔液位失衡问题。
Under the background of ultra-low emission and flexible power generation, the level of absorption tower fluctuates greatly in cascade tower desulfurization system. The level and the water balance are difficult to be effectively controlled. Based on the actual operating conditions of a desulfurization system in a 600 MW unit, the change of the evaporation capacity in the absorption tower was analyzed with the change of the load and the gas temperature. The water balance of the first and second stage tower was studied. Through calculation and analysis, it is found that the total evaporation of the desulfurization tower decreases greatly with the decrease of flue gas. The evaporation of water in a primary tower decreases obviously, and the decrease of the second stage tower is less. The flue gas temperature affected the evaporation significantly, the higher flue gas temperature is, the more evaporation is. But the evaporation in the second stage tower changes smaller.The evaporation in the absorption tower increases mainly due to the sharp increase of evaporation in the first tower. With the loaddecrease, the flushing water usage for the demister in the second stage tower exceeds the evaporation water, resulting in level imbalance. The operation condition that the second stage tower is in the low level and proper extension of the flushing period of demister can help to alleviate level imbalance.

关键词(KeyWords)： 脱硫串联塔;液位;水平衡;除雾器
cascade desulfurization tower;level;water balance;demister

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项资金项目(51206047)

作者(Author): 魏新,宁翔,茹宇,漆聪,肖海平
WEI Xin,NING Xiang,RU Yu,QI Cong,XIAO Haiping

DOI: 10.19585/j.zjdl.201803016

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