褐煤掺烧的可行性分析与试验

Feasibility analysis and experiment of lignite-blended burning

为检验黑龙江华电齐齐哈尔热电有限公司300MW机组掺烧褐煤的可行性,确定了额定负荷下褐煤掺烧时安全、稳定运行的最大比例。在1025t/h锅炉上采用烟煤、褐煤分磨、分燃烧器炉内掺烧方式并进行制粉系统出力、燃煤特性及不同掺烧方式下的锅炉效率试验。试验结果表明,最高掺烧褐煤比为54%,机组主要运行参数正常,在满负荷下未发生严重结焦。在相同负荷下,掺烧褐煤锅炉效率有所下降,但考虑煤价因素,掺烧褐煤机组成本大幅下降,经济效益显著提高。

In order to verify the feasibility of lignite-blended burning in the 300 MW unit of the Heilongjiang Huadian Qiqihaer Thermal Power Company Limited,the maximum ratio of the lignite in the lignite-blended burning was determined,which can ensure the safe and stable operation under the rated load. In the 1 025 t/h boiler,the bituminite and the lignite are pulverized separately,and blended and burned in furnace through different burners. The experiments of the pulverizing system output,the characteristics of the coal and the boiler efficiency in different lignite-blended burning mode were carried out. The experiment result shows that the maximum ratio of the lignite in the lignite-blended burning is about 54%,and in this condition,the main operation parameters of the unit are normal,and there was no serious slagging even at full load. Under the same load,the boiler efficiency of lignite-blended burning is decreased slightly. Considering the difference between the lignite and the bituminite prices,the cost of the unit with lignite-blended burning is decreased greatly,and the economical benefit of the unit increased obviously.