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对4种典型贫煤与无烟煤分别进行了不同混煤方式下的可磨性、粒径分布变化规律实验室试验研究,试验结果表明,混煤的可磨性趋向于难磨煤种、成粉样品中粗颗粒难磨煤多、细颗粒易磨煤种多。从可磨性标准测试角度对试验结果进行了物理解释,提出混煤的可磨性必须由实验确定、“炉前掺混”时混煤的煤粉细度必须由挥发份较低的煤种决定、“分磨制粉”时各组份煤选取各自合理细度的结论。针对几种可磨性差异较大煤种的掺烧,根据制粉系统、燃烧系统的特点,进行了3种不同方式的“分磨制粉”掺烧方式优化试验,通过较好地控制难磨、难燃尽煤种的煤粉细度,锅炉效率较传统的“炉前掺混”方式均提高1.5%以上。
The four kinds of typical lean and anthracite coal were mixed with different ways of grindability, particle size distribution changes in the laboratory test study showed that the grindability of mixed coal tends to hard coal species, into powder The coarse particles in the sample are hard to grind coal and fine particles are easy to grind coal. From the point of view of grindability standard test, the test results are explained physically. It is suggested that the grindability of the mixed coal must be determined experimentally. The fineness of the pulverized coal in the mixed coal before mixing should be controlled by the lower volatile Determination of coal, “sub-milling ” when the various components of the coal to choose the appropriate degree of fineness conclusion. According to the characteristics of pulverizing system and combustion system, three different ways of “partial milling” and “blending mode” were optimized for several kinds of coal with different grindability. By optimizing Control of hard grinding, flame retardant coal powder fineness of coal, boiler efficiency than the traditional “before mixing ” method are increased by 1.5%.