基于互相关的实时煤粉流量监测系统

doi:10.16180/j.cnki.issn1007-7820.2019.03.008

摘要/Abstract

摘要：

工业高炉煤粉喷吹过程中的煤粉传输流量难以监测,容易产生锅炉煤粉输入不均匀及堵塞的问题。为了实时监测煤粉传输管道中的准确流量,文中提出一种基于互相关和电容检测的高精度煤粉流量监测系统。该系统主要包括微弱电容检测电路和电容传感器两部分,设计两层屏蔽的电容传感器,并搭建了高精度、低噪声的数模混合电容检测电路。使用保留互相关特征的滤波算法对电路输出的信号进行滤波,滤去干扰信号的同时保留互相关算法需要的特征波动。结合互相关算法给出的流速和电容检测系统输出转换的浓度值即可获得准确流量,再通过CAN总线实现多管道煤粉流量监测。实验结果表明,该系统实际应用中的煤粉传输重量误差能够控制在约5%,具有良好的精度,能适应复杂工程环境的需求。

关键词: 气固两相流, 微弱电容传感器, 信号滤波, 互相关, 多管道煤粉传输, 数模混合电路

Abstract:

The flow rate of pulverized coal in the pulverized coal injection process of industrial blast furnaces is difficult to monitor, and the problem of uneven input and clogging of boiler pulverized coal is likely to occur. In order to monitor the accurate flow rate in the transportation pipeline in real time, this paper proposed a high-precision coal flow monitoring system based on cross-correlation and capacitance detection. The system mainly contained two parts: weak capacitance detection circuit and capacitance sensor. Two-layer shielded capacitive sensors were designed based on field test results, and a high-precision, low-noise digital-analog hybrid capacitance detection circuit was built. Filtered the interference signal while preserving the characteristic fluctuations required by the cross-correlation algorithm using a filtering algorithm that preserved the cross-correlation feature. Combining the current velocity given by cross-correlation algorithm and concentration converted from capacitance detection system’s output, multi-pipe accurate flow rate could be obtained finally with CAN bus. The experimental results showed that the error in the practical application of the system could be controlled at about 5%, indicating the method had higher accuracy and met the needs of complex engineering environments.

Key words: the gas-solid two-phase flows, weak capacitance sensor, signal filtering, cross correlation, multi-pipe pulverized coal transmission, digital-analog hybrid circuit

中图分类号:

TN710

朱政飞,韦张跃昊,原旭东. 基于互相关的实时煤粉流量监测系统[J]. 电子科技, 2019, 32(3): 36-41.

ZHU Zhengfei,WEI Zhangyuehao,YUAN Xudong. Cross-correlation Based Real-time Pulverized Coal Flow Monitoring System[J]. Electronic Science and Technology, 2019, 32(3): 36-41.

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实际测试	2.7	3.3	3.6	3.9	4.7	8.2
最小值	2.640	3.257	3.583	3.871	4.646	8.192
平均值	2.655	3.276	3.624	3.892	4.651	8.225
最大值	2.703	3.303	3.625	4.012	4.685	8.236

		1		2
	实测煤粉重量	煤粉重量结果	误差百分比	煤粉重量结果	误差百分比
1	0.8	0.2	75%	0.38	51%
2	2	2.67	34%	2.58	29%
3	4.6	3.60	22%	4.02	12%
4	5.5	4.78	13%	5.31	3%
5	3	3.37	12%	3.26	9%
6	7	6.12	13%	7.21	3%
7	5	3.65	27%	5.10	2%