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【目的】燃煤机组制粉系统乏气转移时，高挥发分的煤粉在乏气的高速带动下，容易在氧的参与下形成粉尘云而产生爆炸风险。为降低贫煤改烧烟煤后中间储仓式制粉系统乏气转移装置的爆燃风险，提升制粉系统安全性能，需要合理设置一次风箱的流速和底部倾角。【方法】本文以某电厂330 MW机组乏气转移系统为研究对象，基于数值模拟分析了其一次风箱内部的流场、温度场；研究了一次风流速由7 m/s减小至1 m/s对挥发分析出和富集的影响；同时设计11种不同底部倾角α的风箱型线，对比其对积粉风险区域的流场优化效果。【结果】研究表明，乏气转移至一次风箱后，底部存在低速区易导致煤粉积存，且热风沿壁面下行形成局部高温区，最高温度达329℃，超过煤粉热解温度282℃，为爆燃提供了条件；一次风流速对挥发分富集影响显著，风速降至2 m/s时风箱内CO浓度达到峰值，保持3～7 m/s风速可平衡挥发分析出与带出，有利于系统安全；风箱底部倾角α影响低速区体积，随α增大，低速区体积先减小后增大，当α=8.5°时体积达到最小值0.132 m3。【结论】研究结果为制粉系统乏气转移装置的运行参数调整与结构优化提供量化依据，对类似制粉系统的流场研究及安全隐患治理具有借鉴意义。
Abstract：[Objective] When the exhaust gas of the coal-fired unit pulverizing system is transferred, the high-volatile pulverized coal is driven by the exhaust steam at a high speed, and it is easy to form a dust cloud with the participation of oxygen and cause an explosion risk. In order to reduce the deflagration risk of the exhaust gas transfer device of the intermediate storage bunker pulverizing system after the lean coal is changed to bituminous coal, and improve the safety performance of the pulverizing system, it is necessary to set the flow rate and bottom inclination angle of the primary air box reasonably. [Methods] Taking the exhaust gas transfer system of a 330 MW unit in a power plant as the research object, numerical simulation was used to analyze the flow field and temperature field inside the primary air box. The influence of reducing the primary air velocity from 7 m/s to 1 m/s on the devolatilization and enrichment of volatile matter was studied. Meanwhile, 11 types of air box profiles with different bottom inclination angles(α) were designed to compare their flow field optimization effects on the pulverized coal accumulation risk areas. [Results] The research shows that after the exhaust gas is transferred to the primary air box, a low-velocity zone exists at the bottom, which is prone to pulverized coal accumulation. Moreover, the hot air flows downward along the wall to form a local hightemperature zone with a maximum temperature of 329 ℃, exceeding the pyrolysis temperature of pulverized coal(282 ℃), which provides conditions for deflagration. The primary air velocity has a significant impact on the enrichment of volatile matter: when the wind speed decreases to 2 m/s, the CO concentration in the air box reaches its peak. Maintaining a wind speed of 3-7 m/s can balance the devolatilization and carry-over of volatile matter, which is beneficial to system safety. The bottom inclination angle(α) of the air box affects the volume of the low-velocity zone: as α increases, the volume of the low-velocity zone first decreases and then increases, reaching a minimum of 0.132 m3 when α =8.5°. [Conclusion] The research results provide a quantitative basis for the adjustment of operating parameters and structural optimization of the exhaust gas transfer device in the pulverizing system, and have reference significance for the flow field research and potential safety hazard control of similar pulverizing systems.
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基本信息:
DOI：10.19944/j.eptep.1674-8069.2026.02.009
中图分类号:TM621
引用信息:
[1]郎志强,郭伟伟,袁博,等.基于数值模拟的制粉系统乏气转移装置防爆研究[J].电力科技与环保,2026,42(02):266-274.DOI:10.19944/j.eptep.1674-8069.2026.02.009.
基金信息:
国家自然科学基金项目(52376098); 国能安徽公司科技创新项目(SWMAS-FW4-[2024]14)
2026-04-15
2026-04-15