• 关键词：氨水  CO₂脱除率  CO₂负载量  添加剂  哌嗪(PZ)  磷酸钠

• 基金项目：教育部长江学者奖励计划(2009)

• 张佩芳
• 1. 浙江大学环境工程系, 杭州 310027; 2. 浙江省工业锅炉炉窑烟气污染控制工程技术研究中心, 杭州 310027

• 莫建松
• 浙江省工业锅炉炉窑烟气污染控制工程技术研究中心, 杭州 310027

• 刘越
• 1. 浙江大学环境工程系, 杭州 310027; 2. 浙江省工业锅炉炉窑烟气污染控制工程技术研究中心, 杭州 310027

• 王海强
• 1. 浙江大学环境工程系, 杭州 310027; 2. 浙江省工业锅炉炉窑烟气污染控制工程技术研究中心, 杭州 310027

• 吴忠标
• 1. 浙江大学环境工程系, 杭州 310027; 2. 浙江省工业锅炉炉窑烟气污染控制工程技术研究中心, 杭州 310027

• 摘要：进行了氨法脱碳过程中吸收剂中CO₂负载量对CO₂脱除率影响的实验研究.结果发现,CO₂脱除率随着负载量的增大而显著减小,高负载量(≥0.4)时,增加吸收液中总氨质量分数(吸收液中所有包含氨分子和铵离子的物质,并统一换算成NH₃的质量分数)并不能有效地提高CO₂的脱除率.同时,分别对有机和无机添加剂进行筛选,选取哌嗪(PZ)和十二水磷酸钠(Na₃PO₄·12H₂O)对吸收剂中高CO₂负载量条件下的氨水溶液进行改性.实验结果表明,当哌嗪(PZ)浓度与总氨浓度之比为0.08,在吸收剂中CO₂负载量为0.4、0.5和0.6的条件下,CO₂脱除率可分别提高29.4%、31.0%和21.7%;当Na₃PO₄·12H₂O浓度与总氨浓度之比为0.10,在吸收剂中CO₂负载量为0.4、0.5和0.6的条件下,CO₂脱除率可分别提高11.0%、11.7%和17.1%.

• Abstract：The influence of CO₂ loading on CO₂ removal efficiency was studied in this paper.The experimental results revealed that the CO₂ removal efficiency decreased significantly with increased CO₂ loading.At high CO₂ loadings,the efficiency was very difficult to improve even by further increasing the content of ammonia in the solutions.After screening various organic and inorganic additives,piperazine(PZ) and sodium phosphate were found to show the most improvement in CO₂ removal,and were hence selected for detailed investigation.It was found that when the ratio of PZto total ammonia was 0.08,the CO₂ removal efficiency increased by 29.4%,31.0%,21.7% at CO₂ loadings of 0.4,0.5,0.6,respectively,while when the ratio of sodium phosphate to total ammonia was 0.10,the efficiency increased by 11.0%,11.7%,17.1% at the same CO₂ loadings.

• Key words：aqueous ammonia  CO₂ removal efficiency  CO₂ loading  additives  piperazine(PZ)  sodium phosphate

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