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为解决某电厂100 t/h四角切圆煤粉炉燃烧效率低、燃烧不稳定的问题,采用双通道浓淡与乏气OFA(燃尽风)组合煤粉燃烧器进行技术改造,其特点为上一次风双通道上下浓淡、下一次风水平浓淡并且集中布置,乏气通过OFA送入炉内。冷态结果表明;该改造方案炉内气流充满度好,气流量不偏斜刷墙;一次风喷口有明显的回流区,并随着腰部风开度的增大向炉膛中心移动,回流区半径减小;热态测试结果表明:热效率提高了3个百分点,50%低负荷稳燃,NOx排放量为260 mg/m3(折算到氧量6%)。
In order to solve the problem of low combustion efficiency and unstable combustion of a 100 t / h tangential pulverized coal fired furnace in a power plant, the technical innovation of the dual-channel OFA combustor with pulverized coal combustion is carried out, Once the wind dual channel up and down shades, the next time the level of wind and concentration of concentration, lack of gas into the furnace through the OFA. The results of the cold state show that the airflow in the furnace is full and the airflow does not deviate from the brush wall. The primary air jet has obvious recirculation zone and moves toward the center of the furnace as the waist air opening increases. The radius of the recirculation zone decreases The results of the thermal test showed that the thermal efficiency increased by 3%, the steady-state combustion with 50% load was low, and the NOx emission was 260 mg / m3 (converted to 6% of oxygen).