离子膜烧碱盐水精制经济性运行的研究应用

发布时间：2018-04-30 09:06

本文选题：精制剂 + 经济运行　；参考：《兰州大学》2015年硕士论文

【摘要】：金川集团公司氯碱产能(包括在建)已达到500kt/a。由于在盐水精制过程中需添加大量的碳酸钠、氢氧化钠等精制剂用于去除盐水中的泥沙、Ca2+、Mg2+等杂质,精制剂消耗占离子膜氯碱系统可控成本的20%,开展离子膜烧碱盐水精制经济性运行研究具有重要的现实意义。近年来公司不断加大科研攻关力度,致力于离子膜烧碱盐水精制经济性运行的研究和应用,在降低精制剂消耗方面做了大量的工作。离子膜烧碱系统盐水质量对电解电流效率及离子膜寿命影响较大,精制剂投加量制约精制质量的提升效果。受下游配套耗氯装置停产等因素影响,化工厂离子膜烧碱系统近年来低负荷运行,吨碱平均变动成本达2365.3元／吨。盐水精制过程中碳酸钠、氢氧化钠、盐酸及纯水消耗量大,导致盐水精制成本高于同行业整体水平。国内众多离子膜制碱企业长期致力于协调离子膜烧碱系统盐水质量与精制剂消耗量的矛盾,在保证盐水质量可靠的前提下,解决前反应槽效率低、后反应槽碳酸钠混合不均、树脂塔定量设计、因碱性废水回用造成的盐水指标波动等制约精制剂降耗的关键技术难题。该项目立足于降低精制剂消耗,以技术创新为手段,通过大量的理论研究,经过对各点精制剂流量、盐水指标等反复跟踪、不断地模拟试验,解决了上述问题,建立了一套完整的针对不同生产负荷下盐水精制匹配化操作控制技术。并将其应用于离子膜烧碱系统,显著提升了精制盐水的工艺技术指标,降低了系统物料消耗,实现了盐水精制装置的经济、稳定运行。经济效益、社会效益显著,对氯碱行业的经济运行将起到积极的示范和推广作用。
[Abstract]:Jinchuan Group chlor-alkali production capacity (including construction) has reached 500 kt / a. In the process of brine purification, a large amount of sodium carbonate, sodium hydroxide and other refined preparations are used to remove impurities such as Ca 2 + Ca 2 + mg 2 in brine. The consumption of refined preparation accounts for 20% of the controllable cost of ionic membrane chlor-alkali system, so it is of great practical significance to study the economic operation of ionic membrane caustic soda refining. In recent years, the company has been increasing its scientific research, devoting itself to the research and application of ion membrane caustic soda refining economic operation, and has done a lot of work in reducing the consumption of refined preparation. The quality of salt water in ionic membrane caustic soda system has great influence on electrolytic current efficiency and ion membrane life. The ion membrane caustic soda system in chemical plant has been operated at low load in recent years, and the average variation cost of ton alkali is 2365.3 yuan per ton. The consumption of sodium carbonate, sodium hydroxide, hydrochloric acid and pure water in brine refining process is high, which leads to the higher cost of brine refining than the whole industry. For a long time, many domestic ion-exchange membrane alkali-making enterprises are committed to coordinate the contradiction between salt water quality and the consumption of refined preparation in ionic membrane caustic soda system. On the premise of ensuring the quality and reliability of salt water, the low efficiency of pre-reaction tank and the uneven mixing of sodium carbonate in post-reaction tank are solved. Quantitative design of resin column is a key technical problem for reducing the consumption of refined preparation, such as the fluctuation of salt water index caused by the reuse of alkaline wastewater. This project is based on reducing the consumption of refined preparation, by means of technological innovation, through a large number of theoretical studies, through repeated tracking of the flow rate of each point refined preparation, salt water index, etc., the above problems have been solved through continuous simulation tests. A complete set of operation control technology for brine refining matching under different production loads was established. It has been applied to ionic membrane caustic soda system, which has greatly improved the technological index of refined brine, reduced the consumption of system materials, and realized the economical and stable operation of the brine refining unit. Economic benefits and social benefits are remarkable, which will play an active role in demonstration and promotion of the economic operation of chlor-alkali industry.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ114.261

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