基于颜色传感器的锅炉水质在线检测系统研究

发布时间：2018-05-16 16:24

本文选题：颜色传感器 + 水质硬度　；参考：《西北大学》2016年硕士论文

【摘要】：工业锅炉的水质有严格的硬度要求,硬度超标的水进入锅炉会引起锅炉结垢,水垢的形成会致使锅炉换热效率差,也增加了锅炉的安全隐患。目前水质处理的方式很多,其中使用软水器进行锅炉用水处理是主要方式之一。实际应用中软水器的使用依赖于锅炉用水水质条件,要确定水质条件就要对水质进行检测。传统的人工检测方式不能及时、准确、快速检测水质。随着工业自动化的发展,水质在线检测发展迅速,市场上涌现出很多水质硬度检测的仪器。本文是在课题组原有水质在线检测仪的基础上,研发了一种基于颜色传感器的锅炉水质在线检测系统,该系统主要在以下几个方面对原有水质在线检测仪进行重新设计：一、水质在线检测滴定盒重新设计,采用化学反应混合池和光源、颜色传感器、液位计及搅拌器分离的滴定盒结构,内外两部分材质不同,避免了测试盒结垢影响颜色检测准确度；二、搭建水质在线检测实验平台,优化滴定过程中蠕动泵、进出水阀、出水阀等执行期间的结构,实现滴定过程的可重复性好和机械器件易更换：三、优化了系统软件工作流程,设计了在线检测系统的两种工作模式,增加机械器件运行状态的现场识别功能,增加单片机通讯电路和微控制器通讯控制功能；四、基于颜色传感器芯片经过白平衡校正,通过配置不同浓度实验定性分析系统检测水质硬度的曲线趋势,对具体曲线进行定量分析,通过对不同颜色模型的多项式拟合曲线和一阶导数曲线的比较,确定以RGB颜色模型作为终点判定颜色模型：五、基于MAX485通讯芯片实现水质检测系统通讯功能,通讯协议采用Modbus通讯协议,上位机用户应用界面是基于VB设计,实现了系统运行状态的实时显示和数据读取。通过对在线水质检测仪的重新设计,提高了颜色传感器对滴定反应过程颜色检测的准确性和可靠性,终点判定准确性高,软件实现简单,串口通讯实现了滴定过程的在线监控,在本文最后部分对水质在线检测系统进行实验验证,结果表明在线水质检测系统的滴定过程可靠,水质硬度检测快速准确,能够满足水质在线检测的要求。
[Abstract]:The water quality of the industrial boiler has strict hardness requirement. The water with the hardness exceeding the standard will cause the boiler to scale, the formation of the scale will cause the boiler heat transfer efficiency to be poor, and also increase the boiler safety hidden trouble. At present, there are many ways to treat water quality, among which the use of water softener for boiler water treatment is one of the main ways. In practical application, the use of water softener depends on the water quality condition of boiler. To determine the water quality condition, it is necessary to check the water quality. Traditional manual detection methods can not be timely, accurate, rapid detection of water quality. With the development of industrial automation and the rapid development of on-line water quality detection, there are many instruments for water quality hardness detection in the market. On the basis of the original on-line water quality detector, a boiler water quality online detection system based on color sensor is developed in this paper. The system is mainly redesigned in the following aspects: 1. The titration box for on-line detection of water quality was redesigned, and the titration box structure was separated by chemical reaction mixing cell and light source, color sensor, liquid level meter and agitator. The inside and outside parts of titration box were different in material quality, so the scale of the test box could not affect the accuracy of color detection. Second, set up the water quality on-line testing experimental platform, optimize the structure of peristaltic pump, inlet and outlet valve and so on during the titration process, so that the titration process has good repeatability and the mechanical device is easy to replace: third, The system software workflow is optimized, two working modes of on-line detection system are designed, the field identification function of the running state of mechanical devices is added, and the communication control functions of MCU communication circuit and microcontroller are added. Based on the white balance correction of color sensor chip, the curve trend of water quality hardness was detected by using qualitative analysis system of different concentration experiments, and the specific curve was quantitatively analyzed. By comparing the polynomial fitting curves and the first derivative curves of different color models, it is determined that the RGB color model is used as the end-point color model. Fifth, the communication function of water quality detection system is realized based on MAX485 communication chip. The communication protocol adopts Modbus communication protocol, and the upper computer user interface is designed based on VB, which realizes the real-time display and data reading of the running state of the system. By redesigning the on-line water quality detector, the accuracy and reliability of color sensor for the color detection of titration reaction process are improved, the accuracy of the terminal judgment is high, the realization of software is simple, and the on-line monitoring of titration process is realized by serial port communication. In the last part of this paper, the on-line water quality detection system is verified by experiments. The results show that the titration process of the on-line water quality detection system is reliable, the water quality hardness detection is fast and accurate, and it can meet the requirements of on-line water quality detection.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK227.8

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