Abstract For strengthening the safety and reliability for supercritical water oxidation (SCWO) process, the essential causes and solutions of key challenges such as the high corrosion risk of the heat-exchanger and the entrance part of SCWO reactor, the blockage problems resulted from the solid deposition, and the safety and environmental issues caused by the emergency discharge of supercritical aqueous fluids, were investigated theoretically and experimentally. The thermodynamic state division between chemical- and electrochemical corrosion and the corrosion sensitive temperature range of 280-450 °C featuring the predominant electrochemical corrosion were proposed. A set of optimized parameters for the petrochemical sludge treatment such as a temperature of 520–580 ℃, a pressure of 23-25 MPa, and an oxidation coefficient of 1.1-1.3, which not only can ensure the high enough removal rate of organic pollutants but also prevent the corrosion of construction materials as much as possible; the critical velocity of conveying fluid for avoiding the deposition of solid particles were also obtained. On the bases of innovatively developing the “indirect heat transfer” unit, the mixing-preoxidation equipment, the oxygen removal process for SCWO effluents, and the emergency discharge protection device, a novel SCWO process and its corresponding control scheme were proposed and analyzed.

中文翻译：

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超临界水氧化工艺用于污泥处理的可靠性和安全性的新设计

摘要 为加强超临界水氧化（SCWO）工艺的安全性和可靠性，分析了换热器和SCWO反应器入口部分腐蚀风险高、固体颗粒堵塞问题等关键挑战的本质原因和解决方案。从理论上和实验上研究了沉积以及由超临界水性流体紧急排放引起的安全和环境问题。提出了化学腐蚀和电化学腐蚀之间的热力学状态划分以及以电化学腐蚀为主的腐蚀敏感温度范围 280-450 °C。石化污泥处理的一组优化参数，如温度520-580℃，压力23-25 MPa，氧化系数1.1-1.3，既能保证足够高的有机污染物去除率，又能最大限度地防止建筑材料的腐蚀；还得到了避免固体颗粒沉积的输送流体的临界速度。在创新开发“间接传热”装置、混合预氧化设备、SCWO出水脱氧工艺、紧急排放保护装置的基础上，提出并分析了一种新型SCWO工艺及其控制方案。