火电厂一次风速监测系统的研究与开发

目前，大多数锅炉采用静压管监测各风管压力的方法调整一次风速，因为静压无法反映一次风喷口的流动速度和状况，所以无法实现一次风速准确实时的测量。根据这种情况，对锅炉的一次风速监测方法进行了改进。该方案底层采用微差压传感器测风管的空气气流动压，并对其进行必要的修正，得出较为准确的喷口风速；用ADAM模块进行数据采集和通信，上层用VB实现用户界面。该系统能够直观、实时准确地反映锅炉的风速，已在湖南金竹山电厂投入运行，因锅炉的燃烧稳定性明显增强和灭火次数减少，使得设备维护费用减少，并降低了NOX的生成，具有良好的经济效益和社会效益。

STUDY AND DEVELOPMENT OF MONITORING SYSTEM FOR PRIMARY AIR IN THERMAL POWER PLANT

At present,most boilers use the static pressure to monitor the pressure of air duct in order to adjust the primary air speed. Because the static pressure can't present the flow speed and status of the spout of the primary air, the real-time measurement of the primary air can't be realized accurately. Based on these situations, the method of the measurement of the primary air speed from the boiler is improved. The scheme adopts micro differential pressure sensor to measure the air flow dynamic pressure in the air duct. The result is given necessary amendments in order to acquire accurate air speed of the spout. In the project, the ADAM module is used for collecting data and communication. The user interface is realized by Visual Basic. The system can reflect the real-time speed of the boiler straight and accurately. It is put into practice in the Jingzhushan Power Plant in Hunan Province,with the stability of the boilers combusting enhanced distinctly, the number of fire put out reduced greatly, the equipment maintenance expenses reduced adequately and the deflation of NO X debased swiftly, the system shows perfect economical efficiency and community efficiency.