The paper describes a study of the influence of Overfire Air (OFA) technology on heat and mass transfer parameters for a furnace chamber in the BKZ-75 boiler at the Shakhtinsk power plant (Kazakhstan); this plant is fueled with Karaganda high-ash coal. The computer simulation methods were applied for studying different air supply regimes through the air injectors operating in OFA design with different contributions: 0 (reference variant), 5, 10, 15, 18, and 20 %. The computer simulation of in furnace processes offers the distribution for total velocity vector, tempertaure field, NO₂ concentration field for the entire furnace and the exit zone. The study demonstrated that the operation with air injection at 18 % of OFA is optimal for combustion of high-ash coal. This operation mode offers a higher tempertaure at the flame core and a gradual tempertaure reduction at the chamber outlet; the latter feature is significant for chemistry of combustion products. The boiler under this operation mode offers a reduction of nitrogen oxide NO₂ emissions from the furnace.

该论文描述了过热空气 (OFA) 技术对 Shakhtinsk 电厂（哈萨克斯坦）BKZ-75 锅炉炉膛传热传质参数影响的研究；该工厂以卡拉干达高灰分煤为燃料。计算机模拟方法用于研究通过在 OFA 设计中运行的空气喷射器的不同空气供应方式，具有不同的贡献：0（参考变体）、5、10、15、18 和 20%。炉内过程的计算机模拟提供总速度矢量、温度场、NO _{2 的分布}整个炉子和出口区的浓度场。研究表明，以 18% 的 OFA 注入空气的操作对于高灰分煤的燃烧是最佳的。这种操作模式在火焰核心处提供了更高的温度，在燃烧室出口处提供了逐渐降低的温度；后一个特征对于燃烧产物的化学性质很重要。这种运行模式下的锅炉减少了炉膛中氮氧化物NO _{2 的}排放。