Aqueous chemistry and phase behaviour under generation IV supercritical water reactor conditions

“第四代”CANDU超临界水冷反应堆(“SCWR”)是一座概念设计的反应堆，它将在高达625°C的温度下生产超临界水，用于发电、氢气和区域供暖。使用超临界水将热从反应堆堆芯输送到涡轮机将产生比当前CANDU-PHW设计中的极端水化学条件多得多的极端水化学条件，其运行温度在250至320°C之间。第四代CANDU-SCWR概念的长期可行性取决于设计者预测和控制水化学的能力，以便最大限度地减少放射性核素的传输和微小的腐蚀影响。最重要的区域是从275到450°C和25兆帕的范围，即所谓的“准过渡区”，它包括具有类液体密度的亚临界和超临界水溶液。这是热液化学的前沿领域，因为SCWR需要一个独特的

The "Generation IV" CANDU Supercritical Water-Cooled reactor ("SCWR") is a conceptual design for a would produce super-critical water at temperatures as high as 625°C to generate electricity, hydrogen and district heating. The use of super-critical water to carry heat from the reactor core to the turbine will generate much more extreme water chemistry conditions than those found in the current CANDU-PHW design, which operates from 250 to 320°C. The long term viability of the Gen IV CANDU-SCWR concept depends on the ability of designers to predict and control water chemistry, in order to minimize radionuclide transport and subtle corrosion effects. The region of most importance is the range from 275 to 450 °C and 25 MPa, the so-called "pseudo transition zone" which includes sub-critical and supercritical aqueous solutions at liquid-like densities. This is a frontier region of hydrothermal chemistry, both because the SCWR would require a unique