The performance of arsenic (As) poisoned catalysts in a 600 MW coal-fired power plant was tracked from 12/2013 to 10/2019, and the physicochemical characteristics and service lifetime of the catalyst at the initial stage, ultralow emission reconstruction stage, and catalyst replacement stage of deNO_x device operation were investigated. The results revealed that the active components in the catalyst were lost over time, while the chemical components in the flue gas were gradually deposited on the catalyst. The deposition rate of As in the catalyst decreased with the increase in operation time and the three stages were 1245, 755, and 524 ppm/10³ h, respectively. The specific surface area of the catalyst decreased to 1.57, 0.62, and 0.19 m²/(g·10³h) at the three stages, respectively, while the change rate of SO₂/SO₃ conversion and wall thickness at the three stages were linearly related to the operation time. Influenced by As poisoning and evolution in physicochemical characteristics, the decline rate of catalyst activity at the three stages was higher than the design value, which was 2.47, 5.11, and 2.76 m/10⁴ h², respectively, resulting in the actual service lifetime of the catalyst of only 61, 65, and 52%, respectively.

中文翻译：

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燃煤电厂砷中毒选择性催化还原催化剂的性能和寿命研究

从12/2013到10/2019追踪了600 MW燃煤电厂中砷（As）中毒催化剂的性能，并跟踪了催化剂的初始阶段，超低排放重建阶段以及DENO的催化剂更换阶段_X的设备操作进行了研究。结果表明，催化剂中的活性成分随时间流失，而烟气中的化学成分逐渐沉积在催化剂上。催化剂中As的沉积速率随操作时间的增加而降低，三个阶段分别为1245、755和524 ppm / 10 ³ h。催化剂的比表面积降低到1.57、0.62和0.19m ² /（g·10 ^3）。h）分别在三个阶段，而三个阶段的SO ₂ / SO ₃转化率变化和壁厚与操作时间线性相关。受砷中毒和理化特性演变的影响，三个阶段催化剂活性的下降率均高于设计值，分别为2.47、5.11和2.76 m / 10 ⁴ h ²，导致实际使用寿命催化剂的比例分别仅为61％，65％和52％。