王婷婷1,2，朱建国1,2，师永帅1,2，张 震1,3
(1.中国科学院 工程热物理研究所，北京 100190；2.中国科学院大学 工程科学学院，北京 100049；3.华北电力大学 能源动力与机械工程学院，北京 102206)
DOI:10.13732/j.issn.1008-5548.2022.03.001
收稿日期： 2022-01-19， 修回日期：2022-03-07，在线出版时间：2022-04-08 17:08。
基金项目：中国科学院战略先导科技专项项目，编号：XDA21040100。
第一作者简介：王婷婷(1996—)，女，硕士研究生，研究方向为预热燃烧技术。E-mail：wangtingting@iet.cn。
通信作者简介：朱建国(1977—)，男，研究员，硕士生导师，研究方向为预热燃烧技术。E-mail：zhujianguo@iet.cn。
摘要：依托千瓦级煤粉预热燃烧综合评价实验平台，研究低负荷预热燃烧特性和负荷变化的动态响应特性。结果表明：实验平台在负荷为设计功率的30%状况下运行时，预热温度达到900℃,且预热燃烧系统运行稳定，烟气中的CO排放质量浓度为25 mg/m3, NOx排放质量浓度为150 mg/m3。负荷由设计功率的30%升至42%时，预热温度变化速率为3.2℃/min,预热室升负荷速率为2.4%/min,卧式燃烧室温度变化速率为4.1℃/min,卧式燃烧室升负荷速率为1.3%/min;负荷升高过程中，预热煤气的CO2体积分数先减小后增大，CO和H2体积分数先减小后增大，CH4体积分数基本不变；尾部烟气的CO质量浓度先增大后减小，NOx质量浓度先减小后增大。
关键词：煤粉；变负荷；燃烧特性；动态变化
Abstract：Based on the comprehensive evaluation experimental platform of kilowatt-level pulverized coal preheating combustion, this paper conducted experimental research on low-load preheating combustion characteristics and dynamic response characteristics of load changes. The results show that when the experimental platform runs under the load of 30%, the preheating temperature reaches 900 ℃, and the preheating combustion system works stably, the CO emission in the flue gas is 25 mg/m3, and the NOx emission is 150 mg/m3. When the load increased from 30% to 42%, the preheating temperature change rate is 3.2 ℃/min, the load increasing rate of the preheating chamber is 2.4%/min, the temperature change rate of the horizontal combustion chamber is 4.1 ℃/min, and the load increasing rate of the horizontal combustion chamber is 1.3%/min. During the load increasing process, the CO2 content volume fraction of the preheating gas first decreases and then increases, the CO and H2 content volume fraction first decreases and then increases, and the CH4 content volume fraction remains basically unchanged. The mass concentration of CO content in the tail flue gas increases first and then decreases, and the mass concentration of NOx first decreases and then increases.
Keywords：coal powder; variable load; combustion characteristics; dynamic changes
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