空分透平冷箱高含氧事件的探讨与分析

介绍了某空分项目中遇到的一起低温透平冷箱高含氧事件问题,分析了氧气泄漏的可能性,并用泄漏检查确定了漏点,解释了高含氧的原因,最后对预防冷箱内法兰连接出现泄漏提出了建议.     

基于深度脱水的污泥干化焚烧工艺

介绍了污泥调质机械压滤深度脱水后入炉焚烧的污泥处置工艺,与现有几种污泥处置工艺能耗比较表明深度脱水污泥干化工艺能耗低、系统简单,同时结合该工艺的实际运行情况,详细总结了深度脱水前后污泥成分和形状的变化,最后对深度脱水后污泥循环流化床焚烧系统及主要技术经济指标进行了分析,为同类湿污泥处理提供借鉴和参考。     

溶剂脱酚装置处理焦化废水的应用

溶剂脱酚法是一种有效的废水脱酚方法.采用溶剂脱酚法处理焦化废水,对后续废水处理装置具有很好的预处理效果.溶剂脱酚法能够有效回收废水中的酚,不但具有显著的环境效益,而且能产生一定的经济效益.针对采用溶剂脱酚装置处理焦化废水的效果和运行状况进行了阐述,描述了溶剂脱酚装置的工艺流程和运行参数.实践表明:溶剂脱酚装置是处理焦化废水中含酚的可行方法,将溶剂脱酚装置作为焦化废水处理的一道工序具有良好的推广价值.     

Evaluation of the specific radioactivity of 40 elements created by nuclear transmutation of fission products

A burnup calculation was performed to analyze Après ORIENT process which aims at creating highly-valuable elements by nuclear transmutation of fission products (FPs) separated from LWR spent nuclear fuels. In this paper, numerical evaluation of the specific radioactivity of 40 created elements, from reloaded each FP element, with atomic number from 31 to 70 at the end of the time of 5-year-cooling after the irradiation for 1125 days in each LWR and FBR was carried out. These 40 created elements were classified in 6 categories according to levels of the specific radioactivity and the length of additional cooling period, which was needed for the specific radioactivity to decrease below the exemption level defined by International Atomic Energy Agency. As a result, created ₃₁Ga, ₃₂Ge, ₃₃As, ₃₅Br, ₆₈Er, and ₇₀Yb did not contain any radioisotopes at the end of the 5-year-cooling. It should be noted that created ₃₇Rb, ₅₇La, and ₆₀Nd had much lower specific radioactivities than natural composition of them. Moreover, specific radioactivities of created ₄₀Zr, ₄₂Mo, ₄₄Ru, ₄₆Pd, ₄₉In, and ₅₄Xe were sufficiently lower than their exemption levels at the end of the 5-year-cooling. On the other hand, created ₃₉Y, ₄₅Rh, ₅₀Sn, ₅₂Te, ₅₈Ce, ₅₉Pr, ₆₅Tb, and ₆₆Dy needed additional cooling period less than 10 years until their specific radioactivities decreased below their exemption levels. Then, each additional cooling period required for created ₄₈Cd, ₅₁Sb, ₆₄Gd, and ₆₉Tm was estimated at 10–100 years. Additionally, specific radioactivities of other 13 created elements would not decrease below their exemption levels even if they had been stored for 100 years. There could be significance to create important elements as resources classified in first 4 of the 6 categories defined in this paper, by nuclear transmutation of fission products. In consideration of the efficiency of creation, the radioactivity, and the importance as resources of each product, ₄₄Ru, ₄₆Pd, ₅₂Te, ₆₀Nd, and ₆₆Dy were specially selected as the most important created elements to be more researched in the future Après ORIENT program.