【摘要】 【目的】针对某650 MW超临界旋流对冲锅炉水冷壁的高温腐蚀问题，研究不同贴壁风率对炉膛燃烧特性的影响，以优化防腐效果并控制NO_x排放。【方法】本文以某650 MW超临界旋流对冲锅炉炉膛为研究对象，通过数值模拟方法，分析0%、1.4%、2.6%、3.8%不同贴壁风率对炉膛内的温度、O₂浓度、CO浓度及出口烟气参数的影响，CO浓度≥3%的区域占比为高温腐蚀面积比，作为本文评价指标。【结果】模拟结果表明，原始工况下侧墙冷灰斗至燃尽风区域的CO浓度高达8.5%，与实际腐蚀区域吻合。通过在侧墙加装不同风率的贴壁风系统，发现适量的贴壁风能够显著降低近壁面CO浓度，减少高温腐蚀区域，2.6%贴壁风率下腐蚀安全区域（CO<3%）占比超95%，有效缓解高温腐蚀。同时，加装贴壁风系统有利于主燃区煤粉的充分燃烧，降低炉膛出口的未燃尽碳比例，从2.4%降至1.4%，但NO_x排放增加约6.0 mg/m³，出口烟温下降，氧量上升。【结论】综合考虑防腐效果、改造成本及排放限制，2.6%的贴壁风率为最优方案，可在保证燃烧稳定性的同时显著减少高温腐蚀，并平衡NO_x控制需求。更多还原

【Abstract】 [Objective] To address the high-temperature corrosion issue in the water-cooled walls of a 650 MW supercritical opposed wall-fired boiler, this study investigates the effects of different near-wall air rates on combustion characteristics, aiming to optimize corrosion resistance while controlling nitrogen oxide（NO_x） emissions. [Methods]Numerical simulations were conducted to analyze the impacts of near-wall air rates（0%, 1.4%, 2.6%, 3.8%） on furnace temperature, O₂ concentration, CO concentration, and flue gas parameters. The corrosion-safe area ratio（regions with CO concentration <3%） was adopted as the evaluation criterion. [Results] The results showed that under the original condition, CO concentration near the sidewalls reached 8.5%, consistent with actual corrosion zones. Implementing near-wall air significantly reduced CO concentration; at a 2.6% air rate, over 95% of the sidewall area became corrosionsafe. Additionally, near-wall air enhanced coal combustion efficiency in the main combustion zone, reducing unburned carbon content（from 2.4% to 1.3%）. However, NO_x emissions increased by approximately 10 mg/m3, with lower flue gas temperature and higher oxygen levels at the furnace exit. [Conclusion] Considering anti-corrosion effectiveness,economic costs, and emission standards, a 2.6% near-wall air rate is identified as the optimal solution. It effectively mitigates high-temperature corrosion, maintains combustion stability, and balances NO_x control requirements.更多还原