气扫式多效膜蒸馏过程数学模型研究 |
作者:杨丹,高启君,吕晓龙,武春瑞,陈华艳,王暄,贾悦 |
单位: 中空纤维膜材料与膜过程省部共建国家重点实验室培育基地,生物化工研究所,天津工业大学,天津 300387 |
关键词: 气扫式;多效膜蒸馏;热量回收;造水比;数学模型 |
出版年,卷(期):页码: 2014,34(5):58-64 |
摘要: |
本文针对气扫式膜蒸馏(SGMD)过程能耗高的问题,设计了一种气扫式多效膜蒸馏(SGMEMD)过程。该过程同时具有蒸汽的换热冷凝与料液的预热升温双重作用,从而实现蒸汽潜热的梯级回收利用。根据吹扫气流速、料液循环流量、料液进水温度、料液浓度主要操作参数对气扫式多效膜蒸馏(SGMEMD)过程性能影响的实验研究结果,运用曲线拟合方法,分别建立了膜蒸馏通量J和热量回收率η随着以上参数变化的经验公式。在此基础上,建立了造水比GOR的半经验半理论数学模型。经L9(34)正交试验验证,所建立的经验公式及数学模型均能很好的预测SGMEMD过程的J和GOR。J和GOR计算值与实验值的相对偏差均在 8.0 %以内。 |
A novel sweeping gas multiple-effect membrane distillation process (SGMEMD) was designed based on the high energy consumption of sweeping gas membrane distillation (SGMD) process. The process was set up for the first time with a special latent-heat recovery system where the vapors got condensed and the feed was heated up simultaneously. Thus the latent-heat could be recovery gradually and effectively. The empirical formulas of membrane distillation permeate flux J and heat recovery rate η that describes sweeping gas multi-effect membrane distillation processes (SGMEMD) were presented using curve fitting method, which was according to results of single factor experiment that the effects of sweeping gas flow velocity, feed circulation volumetric flow, feed in temperature and the feed concentration on performance of SGMEMD process were investigated. Based on the empirical formulas, semi theoretical model of GOR was also established. The empirical formulas and semi theoretical model had a high precision in predicting the J and GOR of SGMEMD process, which had been validated by L9(34)orthogonal experiment. Compared to results of experiment, the calculated value of J and GOR relative deviation were within 8.0 %. |
杨丹(1989—),男,天津市人,硕士研究生,研究方向为新型膜蒸馏过程研究.*联系人, |
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