LIU Haiyu, TAN Houzhang, FAN Baoguo, et al. Selection of emission frequency for moisture measurement in coal by microwave power attenuation[J]. Thermal power generation, 2014, 43(6): 136-140.
LIU Haiyu, TAN Houzhang, FAN Baoguo, et al. Selection of emission frequency for moisture measurement in coal by microwave power attenuation[J]. Thermal power generation, 2014, 43(6): 136-140.DOI:
微波法测量煤质水分频率的选取
摘要
通过搭建1~4GHz宽频率微波实验台
测定了6种煤的微波功率衰减对煤质水分变化的响应特性。结果表明:采用微波功率衰减法测量煤质水分时
在频率≥3.5GHz下
煤的含水量变化与微波衰减近似为二次曲线关系
并且随着频率升高
拟合精度相差不大;选择较低的频率可以测量较大含水量和较厚的煤样
实际应用中可根据需要选取合适的频率。
Abstract
A microwave instrument was designed to determine the moisture content in coal with a wide emission frequency ranging from 1 to 4GHz.The response character of microwave power attenuation to moisture content in six kinds of coal showed that when the frequency was larger than 3.5GHz
the response curve of microwave power attenuation to moisture content could be described as conic equation.As the frequency increases
the fitting precision trends to be closer.However
a relative low frequency can be more capable of determining coal with large moisture content and thickness.In real-world usage
we can select the optimal frequency according to requirements.