连续型超临界水氧化反应器中NaCl沉积现象与机理探讨

Phenomena and mechanism of Na Cl deposition in continuous supercritical water oxidation reactor

对连续型超临界水氧化装置中出现的几种有关Na Cl结晶的现象进行了系统的理论解释,对Na Cl在超临界水氧化反应器中的结晶、沉积、结块的机理进行了探讨。在温度、流场等条件较为稳定的情况下,Na Cl超临界水可能处于稳定的过饱和状态而无明显结晶现象。温度突然升高、Na Cl过饱和度增加、流场扰动、壁面微孔、近壁层高温、壁面吸附、重结晶等诸多因素,都是导致Na Cl在反应器壁面结晶沉积、结块蓬起的原因,其中前3项最为重要。

The systematic theoretical explanation of several phenomena related to NaCl crystallization occurring in continuous supercritical water oxidation device is given. The mechanism of NaCl crystallization, deposition and caking is also discussed. Under more stable temperature and flow field, NaCl and supercritical water may be in a stable supersaturated state without significant crystallization. Sudden increase in temperature and NaCl supersaturation, flow field disturbance, wall micropore, high temperature of near wall layer, wall surface adsorption, recrystallization and other factors, all cause the NaC crystal deposition, caking and bulging in the reactor wall, of which the first three are the most important influencing parameters.