无源核子灰斗料位计最佳探测角及开关点研究  

Research on optimum detection angle and switching point of non-radioactive nuclear ash bucket level meter

作　　者：谢希成 张原源 郭亚娟 赖万昌[3] XIE Xicheng;ZHANG Yuanyuan;GUO Yajuan;LAIWanchang(Hebei North University,Zhangjiakou 075000,China;Changping Campus Management Office of Peking University,Beijing 102249,China;Chengdu University of Technology,Chengdu 610000,China)

机构地区：[1]河北北方学院,张家口075000 [2]北京大学昌平校区管理办公室,北京102249 [3]成都理工大学,成都610000

出　　处：《核技术》2019年第10期33-38,共6页Nuclear Techniques

基　　金：河北北方学院谢希成博士基金资助~~

摘　　要：本文对基于电除尘器灰斗上的无源核子料位计进行了蒙特卡罗模拟,从0°~90°不断改变无源核子料位计的探测角度,当探测角度为30°时,达到探测界面最大能量流量。确立了当灰斗壁与水平面的夹角是61.224°时,料位计的最佳探测角度为30°。在蒙特卡罗方法和无源核子料位计的研究基础上,建立了完整的电除尘器灰斗和无源核子料位计模型,得到了料位计在30°探测角下不同粉煤灰高度时的吸收剂量率曲线。用二阶导数法研究了灰斗中粉煤灰的增加和减少趋势以及开关点。为仪器的研制和灵敏度的提高提供了理论指导。[Background]Material level detection is a very important issue for the automatic control of thermal power.How to monitor the material and powder level has become an urgent problem for the thermal power plant.[Purpose]This study aims to find out the best detection angle and switching point to provide theoretical guidance for instrument development and sensitivity improvement.[Methods]First of all,Monte Carlo simulation was applied to the optimum design of the best detection angle for non-radioactive nuclear ash hopper level meter in the range of 0°~90°.Then the angle between the ash bucket wall and the horizontal plane for the optimum detection angle was determinated.Finally,a complete model of dust hopper and passive nuclear level gauge for electrostatic precipitator(ESP)was established,and the high and low switch points material level were by"second derivative method".[Results]When the angle between the probe and the horizontal line reaches 30°,the maximum energy flux is detected while the angle between the ash bucket wall and the horizontal plane is 61.224°.The absorption dose rate curve of material level meter with different fly ash height at 30°detection angle is obtained.[Conclusions]This study provides theoretical guidance for the development of non-radioactive nuclear ash hopper level meter instrument and improvement of sensitivity in thermal power plants.

关 键 词：蒙特卡罗模拟 最佳探测角度 开关点 无源核子灰斗料位计 

分 类 号：TL812.1[核科学技术—核技术及应用]