旋涡式低温煤粉燃烧器的实验及其数值研究  被引量:1

Experimental and Numerical Study of a Swirl-type Low-temperature Pulverized-coal Burner

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作  者:祝波[1] 汪小憨[1] 阎常锋[1] 赵黛青[1] 

机构地区:[1]中国科学院广州能源研究所,广东广州510640

出  处:《热能动力工程》2005年第5期501-505,共5页Journal of Engineering for Thermal Energy and Power

基  金:广东省自然科学基金资助项目(000967);广东省科技计划基金资助项目(202B30803)

摘  要:基于空气分级燃烧降低氮氧化物的原理和流场组织,设计了一种低NOx型低温旋涡煤粉燃烧器,采用实验和数值方法对其流场特性进行了研究。结果表明,在燃烧器下部存在强烈的旋流区,能够形成空气分级所要求的还原区和燃尽区,一、二次风的进风位置和进风方式对流场的组织存在优化的配比选择;基于RNGk-ε模型的燃烧器内两相流运动的数值模拟再现了流场的实验结果,反映了不同尺寸颗粒在分区气流场内的运动规律。Based on the principle and flow field organization of air staged combustion aimed at reducing NOx emissions the authors have designed a swirl-type low-temperature pulverized-coal burner featuring low NOx emissions. By employing an experimental and numerical method a study was conducted of its flow field characteristics. The results of the study indicate that there is at the lower portion of the burner an intensive swirl flow zone, which can contribute to the formation of a reduction and burn-out zone required by the grading of air. As regards the primary and secondary air feeding location and mode there exists for the flow field organization an optimized proportioning option. The numerical simulation of a two-phase flow motion in the burner based on a RNG k-ε model has reproduced the experimental results of the flow field, reflecting the motion law of particulates of various sizes in a zoned gas-flow field.

关 键 词:旋涡燃烧器 煤燃烧 空气分级 降低NOx 

分 类 号:TK16[动力工程及工程热物理—热能工程] O643.21[理学—物理化学]

 

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