学术论文

      θ环填料塔中飞灰对TETA溶液吸收CO2性能的影响

      Influence of fly ash on CO2 absorption using TETA solutionin a θ-ring packed column

      摘要:
      为了解燃煤烟气中飞灰颗粒对三乙烯四胺(TETA)溶液吸收CO2性能的影响,采用液相加入飞灰的方式,在自行设计的乱堆不锈钢θ环填料塔内进行了实验研究.考察了飞灰在溶液温度、液气比、填料高度和飞灰浓度等操作条件下对TETA溶液吸收CO2的效率η和体积总传质系数KGaV的影响规律.结果表明:飞灰的存在降低了TETA溶液吸收CO2的效率η和体积总传质系数KGaV,且随着飞灰浓度的提高其影响呈增加趋势;随着溶液温度的增加,TETA溶液和TETA-飞灰溶液吸收CO2的效率η先升高后降低,KGaV则平稳升高;随着液气比的提高,η和KGaV均快速升高;随着填料高度的增加,η和KGaV升高,但KGaV的升高速率较快;随着溶液温度、液气比和填料高度的增加,飞灰对η和KGaV的影响逐渐减弱.
      Abstract:
      To understand the influence of fly ash in the flue gas generated from coal-fired power plants on the CO2 absorption performance using triethylenetetramine(TETA) as the absorbent, experiments were carried out by using a self-designed packed column filled with stainless steel θ-ring packing and introducing fly ash into the liquid phase.The effect laws of the process conditions, such as the solution temperature, the liquid-gas ratio, the packed height and the fly ash concentration on CO2 absorption efficiency η and the overall mass-transfer coefficient KGaV by using TETA solution were studied.The results show that the presence of fly ash in the TETA solution results in the decrease of CO2 absorption efficiency η and the overall mass-transfer coefficient KGaV, and the influence of fly ash on η and the KGaV becomes more significant with the increasing fly ash concentration.With the increase of the solution temperature, CO2 absorption efficiency η increases firstly and decreases subsequently using TETA solution and TETA with the fly ash solution, but the KGaV only shows a steady increasing tendency.With the increase of the liquid-gas ratio, CO2 absorption efficiency η and the KGaV of these two solutions increase rapidly.With the increase of the packed height, CO2 absorption efficiency η and KGaV also increase correspondingly, but KGaV increases faster.The decrease amplitude of η and the KGaV caused by fly ash becomes smaller with the increase of the solution temperature, the packing height and the liquid-gas ratio.
      作者: 谢文霞 [1] 张军 [1] 徐成威 [1] 涂春民 [2] 吕剑虹 [1] 钟辉 [1]
      Author: Xie Wenxia [1] Zhang Jun [1] Xu Chengwei [1] Tu Chunmin [2] Lü Jianhong [1] Zhong Hui [1]
      作者单位: 东南大学能源热转换及其过程测控教育部重点实验室,南京,210096 陕西清水川能源股份有限公司,榆林,719404
      年,卷(期): 2017, 47(4)
      分类号: TK123
      在线出版日期: 2017年8月15日
      基金项目: 国家重点基础研究发展计划(973计划)资助项目,国家自然科学基金资助项目