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磨煤机一次风量测量不准分析及处理

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针对某电厂 1000 MW机组出现磨煤机一次风量测量不准的问题,结合风量测量原理,得出速度分布不均是风量测流不准的原因.然后对磨煤机入口前一次风道,运用Fluent进行数值模拟,并建立标准k-ε湍流模型.计算结果表明,测量点的数据是可代表整个测量截面的,并不会出现数据不准确的问题.风量测量厂家现场供货的正、负压侧测量管未能一一对应,仅有 3 个负压侧,与测量截面速度平均值误差较大,导致风量测量不准确;重新供货后,现场风量测量准确.
Analysis and Treatment of Inaccurate Measurement of Primary Air Volume of Coal Mill
There was encountered by a 1000 MW unit of an actual plant the problem of inaccurate measurement of coal mill's primary air volume.The present work carried out causal analysis using air flow measuring principle and determined the root of the problem as uneven velocity distribution.Then it numerically simulated the pre-inlet primary air duct and established standard k-εturbulence model.It was found from calculation results that the data of measurement points can represent the entire measurement cross-section,which means there is no data deviation.The measuring tubes at positive and negative pressure sides provided by the manufacturer did not correspond to each other,with only three negative pres-sure sides,resulting in a significant error with average value of the measured cross-sectional velocity.After replacing new measuring tubes,accurate on-site air volume was achieved.

coal millprimary air ductair volume measurementnumerical simulation

程鹏、李官鹏、安春国

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山东电力工程咨询院有限公司,山东 济南 250013

磨煤机 一次风道 风量测量 数值模拟

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(1)
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