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核电站燃料元件制造过程中产生的废弃UO2的循环再利用一直是核电制造领域面临的重要课题,由于核废物料含有的杂质不确定性,导致工艺控制参数的调整十分困难。它涉及:煅烧、溶解、萃取、沉淀干燥、还原、等工艺过程,2016年DCS控制系统进行了全面更新,采用浙大中控的ECS700集散控制系统,用光纤连接的分布式网络系统贯穿整个工艺过程。其中ADU沉淀干燥工序是UO2的循环再利用生产的一个重要环节,其产品是ADU粉末。ADU沉淀干燥工艺包括:硝酸铀酰与氨水的连续2级沉淀、1级均匀混合、固液分离、螺旋加热干燥、破碎处理、分装、称重等工序。为贯彻核安全生产法规提出的:核物料的体积重量必须小于物料临界体积重量的要求。在DCS设计中对关键工艺参数采用比例调节阀闭环PID控制调节方式,严格控制物料重量。针对新研制设备在控制方面的缺失,尝试不同的DCS设计方案,不断修改和完善,使设计解决方案达到最优。
Recycling of abandoned UO2 generated in the process of manufacturing fuel elements of nuclear power plants has always been an important issue in the field of nuclear power generation. Due to the uncertainty of impurities contained in nuclear waste materials, it is very difficult to adjust process control parameters. It involves: calcination, dissolution, extraction, precipitation drying, reduction, and other processes, 2016 DCS control system has been fully updated, using Zhejiang University ECS700 distributed control system, with fiber-optic distributed network system throughout the entire process . ADU precipitation drying process which is an important part of UO2 recycling production, the product is ADU powder. ADU precipitation drying process includes: uranyl nitrate and ammonia continuous two precipitation, a uniform mixing, solid-liquid separation, spiral heating and drying, crushing, packaging, weighing and other processes. In order to implement the nuclear safety production regulations, the volume weight of nuclear material must be less than the critical bulk material weight requirements. In the DCS design of the key process parameters using proportional control valve closed loop PID control regulation, strict control of material weight. For the newly developed equipment in the control of the lack of, try different DCS design, continuous modification and improvement, so that design solutions to achieve the best.