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煤粉浓度局部富集可使析出的挥发分易于与环境氧气达到合适匹配，向回流区喷入一股煤粉、利用回流区高温、低速、高湍流度的特点，使这股煤粉首先着火，然后通过回流区边界强烈的热质交换，将回流区热量传给主流，从而．点燃主流，这是煤粉局部富集、分级点燃的过程。基于这一思路，开发出了新型煤粉开缝钝体燃烧器。实验室研究及工业应用表明，开缝钝体燃烧器对劣质烟煤具有较好的稳燃性能，并且中缝射流可屏蔽正面来的辐射热，使开缝钝体不易被烧坏。
Local enrichment of pulverized coal concentration can make the volatiles which are precipitated easily reach the appropriate match with the ambient oxygen, inject a pulverized coal into the recirculation zone, make use of the characteristics of high temperature, low velocity and high turbulence in the recirculation zone to make this pulverized coal first catch fire , And then through the reflux zone strong thermal mass exchange, the backflow of heat to the mainstream, thus. Ignite the mainstream, which is the partial enrichment of coal, grading lit the process. Based on this train of thought, a new type of pulverized blunt body burners for coal was developed. Laboratory research and industrial application show that the open-body bluff body burner has a good steady-burning property to the poor quality bituminous coal, and the middle jet can shield the radiant heat from the front surface, so that the blunt body with the slit can not be easily burnt out.