1000MW机组神华煤掺烧霍林河褐煤的试验研究

在某电厂1 000MW机组上进行了神华煤与霍林河褐煤掺烧试验,研究了褐煤掺烧比例对磨煤机最大出力、机组最大出力和机组性能的影响,在最佳褐煤掺烧比例下进行了燃烧优化试验并提出了掺烧褐煤后产生的问题及解决措施.结果表明：随着褐煤掺烧比例的增大,磨煤机最大出力逐渐降低;当褐煤掺烧比例大于40%时,机组最大出力将受到明显影响;在目前设备条件下,褐煤最佳掺烧比例为30%.在最佳褐煤掺烧比例下,额定负荷时省煤器最佳出口氧量偏置为＋0.4,最佳燃尽风挡板开度偏置为-10%.通过燃烧调整,基本上解决了掺烧褐煤后炉膛结焦问题,锅炉效率提高了0.07%,NOx排放质量浓度为293.2mg/m3.

Experimental Study on Mixed Combustion of Shenhua Coal with Huolinhe Lignite in a 1 000 MW Power Unit

An experimental study was carried out on the mixed combustion of Shenhua coal with Huolinhe lignite in a 1 000 MW power plant, so as to analyze the effect of blending ratio on the maximum mill out put, maximum unit output and the unit performance. Combustion optimization tests were performed at an optimal blending ratio, during which problems that may be produced by blending lignite were proposed, while corresponding countermeasures suggested. Results show that the maximum mill output reduces gradually with rising blending ratio of lignite; the effect will be obvious especially when the ratio gets a bove 40% ; the optimal blending ratio of lignite is 30% under the test conditions, in which case the optimal bias of oxygen at outlet of economizer is ＋0.4, and the optimal bias of baffle opening for over-fire air is -10% at rated load. Based on combustion adjustment, the coking problems occurring on boiler rear wall due to mixed combustion with lignite has basically been solved, with a 0.07 % increase of boiler efficiency and a NOx emission of 293.2 mg/m^3.