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首页> 外文期刊>Environmental Science & Technology >Hydrous Mineral Dehydration Around Heat-Generating Nuclear Waste in Bedded Salt Formations
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Hydrous Mineral Dehydration Around Heat-Generating Nuclear Waste in Bedded Salt Formations

机译：层状盐岩层中发热核废料周围的含水矿物脱水

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摘要

Heat-generating nuclear waste disposal in bedded salt during the first two years after waste emplacement is explored using numerical simulations tied to experiments of hydrous mineral dehydration. Heating impure salt samples to temperatures of 265 ℃ can release over 20% by mass of hydrous minerals as water. Three steps in a series of dehydration reactions are measured (65, 110, and 265 ℃), and water loss associated with each step is averaged from experimental data into a water source model. Simulations using this dehydration model are used to predict temperature, moisture, and porosity after heating by 750-W waste canisters, assuming hydrous mineral mass fractions from 0 to 10%. The formation of a three-phase heat pipe (with counter-circulation of vapor and brine) occurs as water vapor is driven away from the heat source, condenses, and flows back toward the heat source, leading to changes in porosity, permeability, temperature, saturation, and thermal conductivity of the backfill salt surrounding the waste canisters. Heat pipe formation depends on temperature, moisture availability, and mobility. In certain cases, dehydration of hydrous minerals provides sufficient extra moisture to push the system into a sustained heat pipe, where simulations neglecting this process do not.
机译：利用与含水矿物脱水实验相关的数值模拟，探索了在废物安置后的头两年中在床盐中产生核废料的热处置方法。将不纯的盐样品加热到265℃可以释放超过20质量％的含水矿物质作为水。测量了一系列脱水反应中的三个步骤（65、110和265℃），并将每个步骤的失水量从实验数据平均到水源模型中。假设含水矿物质量分数为0％至10％，则使用该脱水模型进行的模拟可预测750 W废料罐加热后的温度，湿度和孔隙率。当水蒸气被驱离热源，冷凝并流回热源时，就会形成三相热管（蒸气和盐水会逆向循环），从而导致孔隙率，渗透率和温度发生变化废物罐周围回填盐的饱和度，饱和度和热导率。热管的形成取决于温度，水分供应和流动性。在某些情况下，含水矿物质的脱水会提供足够的额外水分，以将系统推入持续的热管中，而忽略该过程的模拟则没有。

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  • 来源
    《Environmental Science & Technology》 |2015年第11期|6783-6790|共8页
  • 作者

    Amy B. Jordan; Hakim Boukhalfa; Florie A. Caporuscio; Bruce A. Robinson; Philip H. Stauffer;

  • 作者单位

    EES-16: Computational Earth Science, MS T003, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States;

    EES-14: Earth System Observations, MS J-599, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States;

    EES-14: Earth System Observations, MS J-599, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States;

    SPO-CNP: Civilian Nuclear Programs, MS H816, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States;

    EES-16: Computational Earth Science, MS T003, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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