无源核子料位计在灰位检测中的研究

The Study of Passive Nuclear Level Meter on the Ash Level Detection

针对现有火电厂使用的料位计在灰位检测时存在的无法实时检测、测量不精确的问题,根据γ射线的衰减规律和吸收原理,建立了一个实际检测的理想模型,通过理论计算和推导给出了计数率和灰位高度之间的函数关系并设计了一种无源核子料位计。该料位计的软硬件方面均采用模块化设计思想并实现料位计与上位机的通信,实施远程控制。同时,搭建实验平台,记录计数率的变化值,对推导的模型进行验证。对比实际测量曲线和模型计算所得曲线走势,结果表明,该模型能正确反应计数率和灰位高度之间的关系并且该无源核子料位计可以实时检测灰斗的灰位变化。

In view of the problem that the material level meter used in the existing thermal power plant cannot detect in real-time and measure inaccurately in the coal ash position detection,an ideal model for actual detection is established according to the attenuation law and absorption principle of gamma ray.A functional relation between counting rate and ash height is given by theoretical calculation and deduction,and a nonradioactive nuclear material level meter is designed.The hardware and software aspects of the level meter adopt modular design ideas and realize communication between the level meter and the host computer to implement remote control.At the same time,an experimental platform is set up to record the change of counting rate and verify the derived model.Compared the actual measured curve with the curve trend calculated by the model,the results show that the model can correctly respond to the relationship between the counting rate and the ash level height,and the nonradioactive nuclear material level meter can detect the ash level change of the ash hopper in real-time.