Cano Grégory, Moulin Philippe
Laboratoire de Mécanique, Aix-Marseille University, Modélisation et Procédés Propres, Equipe Procédés Membranaire (EPM-M2P2-CNRS-UMR 7340), Europôle de l'Arbois, BP 80, Bat. Laennec, Hall C, CEDEX 04, 13545 Aix en-Provence, France.
Membranes (Basel). 2022 Dec 19;12(12):1285. doi: 10.3390/membranes12121285.
The generation of water vapor is crucial for the petrochemical industry. In order to protect the boiler from damage, the re-injected water must not contain any suspended matter, especially hydrocarbons. Moreover, it is condensed steam with a temperature close to 100 °C and the unintentional creation or chronic generation of pollution, respectively, that can more or less produce the concentrated pollution. In this context, membrane processes appear promising in order to achieve this reuse and more especially crossflow ceramic membranes. The novelty of this paper is to study the retention of hydrocarbons and suspended solids contained in the condensate hot water of a high-capacity boiler using ceramic ultrafiltration membranes. In total, two ultrafiltration molecular weight cut-offs were used: 50-150 kDa. Several operating parameters were studied such as effluent type (accidental or chronic pollution), temperature, transmembrane pressure, initial volume, and pilot plant size. In all cases, retention of suspended matter was above 90% and residual hydrocarbon concentrations were under 0.1 ppm even for high-volume concentrations. Control of the transmembrane pressure and the molecular weight cut-off of the membrane are key to optimizing the process. Despite the high-volume concentration obtained, the membranes were perfectly regenerated with conventional cleaning procedures.
水蒸气的产生对石化行业至关重要。为保护锅炉不受损坏，回注的水不得含有任何悬浮物，尤其是碳氢化合物。此外，温度接近100°C的冷凝蒸汽以及分别无意产生或长期产生的污染，或多或少会产生浓缩污染。在这种情况下，膜工艺对于实现这种再利用显得很有前景，尤其是错流陶瓷膜。本文的新颖之处在于使用陶瓷超滤膜研究大容量锅炉冷凝热水中所含碳氢化合物和悬浮固体的截留情况。总共使用了两种超滤截留分子量：50 - 150 kDa。研究了几个操作参数，如流出物类型（意外或长期污染）、温度、跨膜压力、初始体积和中试装置规模。在所有情况下，即使对于高体积浓度，悬浮物截留率也高于90%，残余碳氢化合物浓度低于0.1 ppm。控制跨膜压力和膜的截留分子量是优化该工艺的关键。尽管获得了高体积浓度，但通过常规清洗程序，膜得到了完美再生。
