关键词: IGCC, 除盐水, 预处理, 浊度, 胶体硅, 高效纤维过滤器, 树脂氧化, 超滤装置

Abstract: The existing problems of the old water purification station and high efficiency fiber filter of the existing demineralized water pretreatment unit of an integrated refining and chemical plant are analyzed, and put forward improvement measures. The equipment of the old purified water station is upgraded and modified so that the water quality of the effluent meets the requirements of the desalted water pretreatment equipment. The characteristics and applicable scope of three desalted water pretreatment technologies including activate carbon, ultrafiltration and reverse osmosis are compared. In accordance with that comparison result, ultrafiltration equipment is added after the high efficiency fiber filter and before the anode floating bed. The turbidity of the effluent of the ultrafiltration unit can be less than 0.5 NTU and SDI less than 3, which reduces the oxidative degradation of floating bed anode resin and organic pollution of cathode resin in floating bed. It can remove more than 70% of colloidal silica in demineralized water, save investment and operation cost, prolong the operation cycle of chemical water treatment equipment, and ensure the silica content of ultra high pressure steam meets the requirements. The safe and efficient operation of the steam turbine of ethylene cracking compressor is ensured.

Key words: IGCC, demineralized water, pretreatment, turbidity, colloidal silica, high efficiency fiber filter, resin oxidation, ultrafiltration device