中文摘要：

提出了一种具有新型结构的浓淡式旋流燃烧器,其出口射流由浓淡一次风、内外二次风组成,喷口为特制结构.采用热线风速仪对燃烧器模型出口空气动力场参数进行了测试,同时以颗粒捕集法为手段对一次风粉混合物在经过燃烧器后的气固分离效果进行了试验研究.结果表明：新型燃烧器具有优越且稳定的空气动力场,能够强化回流,提高轴线附近湍动度水平,有利于改善着火条件,抑制NOx污染物的形成;煤粉浓缩装置对实现浓淡分离的作用显著,燃烧器出口浓淡比可达4∶1以上.

英文摘要：

A new type of swirl burner for dense-dilute pulverized coal is presented,of which the outlet jet is composed of dense-dilute primary air and inside/outside secondary air,and the spout structure is specially made.Parameters of aerodynamic field at outlet of model burner was measured using hot-wire anemometer,while the effect of gas-solid separation studied in the way of particle capture after the mixture of primary air and pulverized coal having passed through the burner was analyzed.Results indicate that the new type burner can form a superior and stable aerodynamic field,which is able to strengthen the recirculating flow,enhance the turbulent intensity around axis,improve the ignition condition and therefore control the NOx emission.The coal concentrator has a significant effect on the dense-dilute seperation and the rich-lean ratio at burner outlet can be increased up to 4∶1.