基于煤粉流速测量的燃烧控制系统分析和优化设计

目前诸多燃煤电站锅炉运行均存在燃烧不稳、燃烧效率低甚至锅炉泄漏等现象，这些现象均与煤粉管道中煤粉流速有直接关系。为了准确测量煤粉流速，探明煤粉流速对锅炉燃烧的影响规律，以某燃煤电厂中一台磨煤机为实验平台，在其2号和3号煤粉管道上安装了基于静电法和相关测速原理的静电传感器，来测量煤粉流速。通过对测量数据的分析，以及与DCS火检监视系统相关参数的对比，验证了各煤粉管道间煤粉流速的失衡，也说明了不同煤粉流速对锅炉燃烧的影响。最后，提出了基于煤粉流速的燃烧控制和优化方案。

Analysis and Optimization Design of Combustion Control System Based on Coal Particle Velocity Measurement

Currently in the boiler operation of coal-fired power plants, there exist some common problems such as unstable combustion, low combustion efficiency and even boiler leakage, which are all directly related to the coal particle velocity in the pipeline. In order to measure the coal particle velocity accurately and explore the relationship between the velocity and boiler combustion, taking the coal mill in a power plant as the test platform, two electrostatic sensors based on electrostatic method and correlation velocity measurement theory are installed on Pipes 2 and 3 to measure the velocity. Through the analysis on the measurement data and the comparison with those from the boiler combustion monitoring system in DCS, the imbalance between the particle velocities in the coal pipes is observed and the impact of coal particle velocities on boiler combustion is also verified. At last, the combustion control and optimization scheme based on coal particle velocity measurement is proposed.