Ash deposition and condensation of acid vapors under deep-cooling of exhaust gas in a 1000 MW ultra-supercritical power plant were investigated. X-ray diffraction, X-ray fluorescence and laser particle size analyzers were employed to characterize the components, elements and particle size distribution of deposits at different metal wall temperatures. The results show that the deposits formed at the metal wall temperatures of 40 °C–60 °C were much thicker than the deposits at 70 °C–90 °C from the perspectives of the morphology and thickness. Fluorides and chlorides were observed in deposits formed at the metal wall temperatures of 40 °C–60 °C. Thin deposits were composed of Al-Si oxides and simple sulfates when the metal wall temperatures were 70 °C–90 °C. The dew-point temperatures of water, HCl and HF vapors were around 40 °C, 60 °C, and 60 °C, respectively. Basic ferric, aluminum and calcium sulfates, which were acted as traps to absorb the condensate and fly ash. Hydration played an important role in the growth of deposits formed at the metal wall temperature of 40 °C–60 °C.

研究了1000 MW超超临界发电厂在废气深度冷却下的灰分沉积和酸蒸气的冷凝。使用X射线衍射，X射线荧光和激光粒度分析仪来表征在不同金属壁温下沉积物的成分，元素和粒度分布。结果表明，从形态和厚度的角度来看，在40°C–60°C的金属壁温度下形成的沉积物比70°C–90°C的沉积物厚得多。在40°C–60°C的金属壁温下形成的沉积物中观察到氟化物和氯化物。当金属壁温度为70°C–90°C时，薄的沉积物由Al-Si氧化物和简单的硫酸盐组成。水，HCl和HF蒸气的露点温度分别约为40°C，60°C和60°C，分别。碱性的硫酸铁，铝和钙被用作捕集阱，以吸收冷凝水和飞灰。水合在40°C至60°C的金属壁温下形成的沉积物的生长中起着重要作用。