【摘要】 为探究吸收容量大、再生能力较强的吸收剂复合吸收燃烧烟气中CO₂的性能,采用N-甲基二乙醇胺-哌嗪（MDEA-PZ）、碳酸钾-哌嗪（K₂CO₃-PZ）以及氨水-哌嗪（NH₃-PZ） 3种二元复合溶液,基于Rate-based模型对其进行脱碳性能过程模拟。以吸收剂的摩尔流量、温度以及摩尔分数配比（X∶PZ） 3个因素进行单因素研究,并在此基础上采用正交试验的方法得出最佳工艺方案。结果表明,随着吸收剂的摩尔流量上升、温度下降以及吸收剂中PZ摩尔分数上升,CO₂吸收效率呈上升趋势。在最佳工艺方案中,K₂CO₃-PZ二元复合溶液最佳吸收温度为40℃,MDEA-PZ和NH₃-PZ两种二元复合溶液最佳吸收温度为30℃;3种二元复合溶液最佳摩尔流量为3.5×105kmol/h,最佳摩尔分数配比为60%∶40%。在各自最佳工艺以及其他条件相同的情况下,吸收CO₂性能的优劣依次为MDEA-PZ、NH₃-PZ以及K₂CO₃-PZ。更多还原

【Abstract】 To investigate the performance of the absorbents with high absorption capacity and strong regenerative capacity to compound absorbing CO₂ in the combustion flue gas, three binary compound solutions of methyldiethanolamine-piperazine（MDEA-PZ）, potassium carbonate-piperazine（K₂ CO₃-PZ）and ammonia-piperazine（NH₃-PZ） were selected. Based on the Rate-based model, the decarburization performance process simulations were conducted. The effect of three factors of absorbent, including molar flow rate, temperature and molar concentration ratio（X∶PZ）, were studied by single-factor method. On this basic, the optimal process conditions were obtained by orthogonal test method. The result showed that, as the molar flow rate of the absorbent increases, the temperature of the absorbent decreases, and the PZ molar concentration in the absorbent increases, the CO₂ absorption efficiency increases. Under the optimal process conditions, the optimal absorption temperature of the K₂ CO₃-PZ binary compound solution is 40°C. The optimal absorption temperature of the binary compound solution of MDEA-PZ and NH₃-PZ is 30°C. The optimal molar flow rate of the three binary compound solutions is 3.5×105 kmol/h,and the optimal molar concentration ratio is 60%∶40%. Under each optimal process conditions and other same conditions, the order of CO₂ absorption performance is MDEA-PZ>NH₃-PZ>K₂ CO₃-PZ.更多还原