甲醇污水减压热泵精馏回收工艺优化研究
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摘要
为了对甲醇污水减压热泵精馏回收工艺进行准确模拟,采用改进的Rose釜通过循环法测定甲醇污水体系的汽液相平衡数据,利用Aspen Properties 7.2对此数据进行NRTL-RK模型的交互作用参数回归关联,借助Aspen Plus 7.2探讨进料中甲醇质量分数、理论塔板数、进料板位置、系统真空度与压缩机功耗之间的相互关系并对它们进行工艺优化。结果表明:甲醇污水体系的汽液相平衡数据较二元甲醇-水体系存在较大偏差,回归关联得到的交互作用参数可顺利通过热力学一致性验证,其回归参量和回归结果的标准偏差仅为0.204 7,0.985 0;在确保塔顶甲醇产品和塔底外排废水达标的前提下,T-101的进料中甲醇质量分数应尽量控制不低于11%,最佳理论塔板数为14,最佳进料板位置为第7块塔板,而系统真空度则维持在65 kPa为宜。经可靠性验证,减压热泵精馏处理后塔顶及塔底甲醇的平均质量分数均满足规定要求。文中可为该技术的工业化应用和大规模推广提供科学、可靠的理论支撑和数据来源。
In order to accurately simulate the recovery process of vacuum heat pump distillation for methanol wastewater, the vapor liquid equilibrium data of methanol wastewater system was determined by improved Rose kettle using circulation methodology. Aspen Properties 7.2 software was adopted to carry out interaction parameter regression correlation based NRTL-RK model. With the help of Aspen Plus 7.2 software, the relationship between methanol mass fraction, theoretical plates number, feed plate location, system vacuum degree and compressor power consumption was discussed and the mentioned process parameters was also optimized. The results demonstrate that the vapor liquid equilibrium data of methanol wastewater system occurr larger deviation comparing with binary methanol-water system. The interaction parameters obtained by vapor liquid equilibrium data regression correlation could be verified through thermodynamic consistency and the standard deviations of regression parameters and regression results were only 0.204 7 and 0.985 0. For the sake of ensuring methanol product and discharged effluent separated by distillation column reach the standard, the methanol mass fraction of T-101 feed should be controlled not less than 11%. The best theoretical plate number, feed plate location and system vacuum degree was 14, 7~(th) and 65 kPa, respectively. The average methanol mass fraction at the top and bottom of the tower was verified and they could completely meet the demands of specified requirement after vacuum heat pump distillation treatment. This paper could provide a scientific and reliable academic support and data source for industrial application and large-scale promotion of such technology.
In order to accurately simulate the recovery process of vacuum heat pump distillation for methanol wastewater, the vapor liquid equilibrium data of methanol wastewater system was determined by improved Rose kettle using circulation methodology. Aspen Properties 7.2 software was adopted to carry out interaction parameter regression correlation based NRTL-RK model. With the help of Aspen Plus 7.2 software, the relationship between methanol mass fraction, theoretical plates number, feed plate location, system vacuum degree and compressor power consumption was discussed and the mentioned process parameters was also optimized. The results demonstrate that the vapor liquid equilibrium data of methanol wastewater system occurr larger deviation comparing with binary methanol-water system. The interaction parameters obtained by vapor liquid equilibrium data regression correlation could be verified through thermodynamic consistency and the standard deviations of regression parameters and regression results were only 0.204 7 and 0.985 0. For the sake of ensuring methanol product and discharged effluent separated by distillation column reach the standard, the methanol mass fraction of T-101 feed should be controlled not less than 11%. The best theoretical plate number, feed plate location and system vacuum degree was 14, 7~(th) and 65 kPa, respectively. The average methanol mass fraction at the top and bottom of the tower was verified and they could completely meet the demands of specified requirement after vacuum heat pump distillation treatment. This paper could provide a scientific and reliable academic support and data source for industrial application and large-scale promotion of such technology.
引文
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[11] 孙德芳, 邵旻, 周政, 等. 减压精馏法制备无水乙醇的研究[J]. 现代化工, 2010, 30(6):74-77.
[12] 李沐荣, 许良华, 辛春伟, 等. 热泵精馏隔壁塔分离宽沸程物系的模拟[J]. 化工学报, 2017, 68(5):1906-1912.
[13] 何鹏, 薛文瑞. 延长气田含甲醇污水预处理工艺改造效果评价[J]. 油气田环境保护, 2016, 26(2):17-19.
[14] 杨志刚, 张宁生, 吴新民. 氧化絮凝/缓蚀阻垢技术处理气田含醇污水研究[J]. 天然气工业, 2004, 24(10):114-117.
[2] 许维秀, 李其京, 陈光进. 天然气水合物抑制剂研究进展[J]. 化工进展, 2006, 25(11):1289-1293.
[3] 任泽, 潘翔, 田旭, 等. 基于hysys的甲醇用量模拟优化研究[J]. 辽宁化工, 2018, 47(2):156-158.
[4] 刘峰, 杨恒远, 刘波, 等. 靖边气田含醇污水处理工艺优化[J]. 天然气工业, 2007, 27(5):124-125.
[5] 李勇. 长庆气田含甲醇污水处理工艺技术[J]. 天然气工业, 2003, 23(4):112-115.
[6] 王登海, 王遇冬. 长庆气田含醇污水甲醇回收工艺技术探讨[J]. 石油与天然气化工, 2001, 30(3):151-152.
[7] 单巧利, 李勇, 张超, 等. 长庆气田甲醇污水水质特点分析[J]. 油气田环境保护, 2012, 22(6):47-49.
[8] 赵运涛, 王毅, 曹强强, 等. 延长气田含甲醇污水再生系统模拟及优化改造[J]. 石油与天然气化工, 2017, 46(6):106-110.
[9] 马文成, 韩洪军, 高飞, 等. 甲醇废水处理研究进展[J]. 化工环保, 2008, 28(1):29-32.
[10] 黄朝平, 闫有涛. 含醇污水甲醇回收工艺技术探讨[J]. 当代化工, 2015, 44(5):1176-1178.
[11] 孙德芳, 邵旻, 周政, 等. 减压精馏法制备无水乙醇的研究[J]. 现代化工, 2010, 30(6):74-77.
[12] 李沐荣, 许良华, 辛春伟, 等. 热泵精馏隔壁塔分离宽沸程物系的模拟[J]. 化工学报, 2017, 68(5):1906-1912.
[13] 何鹏, 薛文瑞. 延长气田含甲醇污水预处理工艺改造效果评价[J]. 油气田环境保护, 2016, 26(2):17-19.
[14] 杨志刚, 张宁生, 吴新民. 氧化絮凝/缓蚀阻垢技术处理气田含醇污水研究[J]. 天然气工业, 2004, 24(10):114-117.
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