基于差分吸收光谱法的氨逃逸在线监测技术研究

发布时间：2018-01-07 20:21

本文关键词：基于差分吸收光谱法的氨逃逸在线监测技术研究　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：火电厂的氮氧化物排放是大气污染的一个重要成因,伴随着我国对氮氧化物处置力度的加大,工业脱硝变得越来越重要,但是脱硝中的氨逃逸会产生一系列问题,需要对其进行监测。然而,国内固定污染源连续监测系统生产企业的水平与国外有一定差距,存在许多亟需解决的问题。本文主要工作内容如下:首先,本文介绍了国内外烟气监测的几种方法,并介绍了相关的产品。着重介绍了差分吸收光谱法(DOAS)的基本原理和其中的关键问题,并分析了连续光源在工作过程中出现的参考光谱变化对浓度反演的影响。其次,完成了DoasDeductiveSystem软件的开发,分析了软件需要完成的功能和相关功能实现时所需的关键技术,从文件格式、菜单、参数、算法设计等方面对软件进行了详细设计。在所有工作完成后,将软件发布,发布版中包括了一些所需的控件、动态链接库等。然后,搭建了一套实验系统。针对光学系统进行了详细的介绍,并且在设计吸收池的过程中,利用ANSYS CFX软件对不同长度气体吸收池的流场进行了分析,对不同流量时气体吸收池的流场进行了分析,然后根据流场分析结果设计了符合实验需求的吸收池。最后,利用搭建完成的实验系统进行了实验,并对采集到的数据进行了分析。结果表明,DOAS技术对于氨逃逸的在线监测是适用的。
[Abstract]:Nitrogen oxide emission from thermal power plants is an important cause of air pollution. With the increase of nitrogen oxides disposal in China, industrial denitrification becomes more and more important. However, ammonia escape in denitrification will cause a series of problems, which need to be monitored. However, there is a certain gap between the level of domestic fixed pollution source continuous monitoring system and the level of production enterprises abroad. There are many problems that need to be solved. The main work of this paper is as follows: firstly, this paper introduces several methods of flue gas monitoring at home and abroad. The basic principle and key problems of differential absorption Spectrometry (DOAs) are introduced. The influence of the reference spectrum change in the working process of continuous light source on the concentration inversion is analyzed. Secondly, the development of DoasDeductiveSystem software is completed. This paper analyzes the functions that the software needs to complete and the key technologies needed to realize the related functions. It designs the software in detail from the aspects of file format, menu, parameters, algorithm design and so on. After all the work has been done, the software is designed in detail. Release the software, the release includes some required controls, dynamic link library and so on. Then, a set of experimental system is built. The optical system is introduced in detail, and in the process of designing absorption pool. The flow field of different length gas absorption cell is analyzed by ANSYS CFX software, and the flow field of gas absorption cell with different flow rate is analyzed. Then according to the results of the flow field analysis, the absorption pool is designed to meet the experimental requirements. Finally, the experimental system is used to carry out the experiment, and the collected data are analyzed. The results show that. DOAS technology is suitable for online monitoring of ammonia escape.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X773;X831

【相似文献】