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在一台HG-410/9.8-YW15型煤粉锅炉上进行了常规煤粉再燃技术示范,研究了常规煤粉再燃技术的NOx脱除效果,分析了技术实施对锅炉效率、炉膛温度、结渣等的影响。满负荷下,采用常规煤粉再燃技术后,锅炉NOx排放降低到了268mg/m3(标准状态),NOx脱除率达到了51%。低负荷下NOx脱除率更高,可达到57%。采用常规煤粉再燃技术后,锅炉蒸汽参数和减温水量正常,锅炉飞灰含碳量为2.33%,对锅炉效率和飞灰的资源化利用影响很小。由于采用低氧运行方式,锅炉效率有所升高。满负荷时炉内主燃区温度较改造前升高,这有利于稳定燃烧;再燃喷口以上区域炉膛温度改造前后基本不变。再燃技术不会影响锅炉的低负荷稳燃能力。由于采取了一系列防结焦措施,技术改造没有给锅炉带来结焦问题。
In a HG-410 / 9.8-YW15 type pulverized coal fired boiler conventional pulverized coal reburning technology demonstration, the conventional pulverized coal reburning technology of NOx removal efficiency, analysis of the technical implementation of the boiler efficiency, furnace temperature, slagging And so on. At full load, with conventional pulverized coal reburning, the boiler NOx emissions have been reduced to 268 mg / m3 (standard state) and NOx removal has reached 51%. Under low load NOx removal rate higher, up to 57%. After the conventional pulverized coal reburning technology is adopted, the boiler steam parameters and the temperature of the desuperheating water are normal. The carbon content of the fly ash of the boiler is 2.33%, which has little effect on the boiler efficiency and the resource utilization of the fly ash. As a result of low-oxygen operation, the boiler efficiency has increased. At full load, the temperature of the main combustion zone in the furnace is higher than that before the reform, which is in favor of stable combustion. The temperature of the furnace above the reburn nozzle is basically unchanged before and after the transformation. Reburning technology will not affect the boiler’s low load steady combustion capacity. As a result of a series of anti-coking measures, technological transformation did not bring the boiler coking problem.