锅炉二次风和净烟气流场数值模拟分析与测量装置研究

发布时间：2018-04-17 03:31

本文选题：二次风 + 净烟气　；参考：《华北电力大学》2017年硕士论文

【摘要】：燃煤电厂是中国电力的主要供应,这种局面短期内不会改变。燃煤电厂的锅炉大多数采用煤粉燃烧的方式发电,其中锅炉二次风的分配影响着煤粉着火和燃尽的过程,这也直接关系到电厂锅炉运行的经济性和可靠性。火电厂脱硫系统后净烟气烟道内的烟气流量和污染物排放量是环保监测的重要数据。因此,研究锅炉二次风道和净烟气烟道内的流场分布特性以及实现流量的准确测量显得尤为重要。首先,本文通过给定的电厂锅炉二次风道和净烟气烟道的结构设计及参数,采用三维建模软件Pro/E建立合理的结构模型。采用ANSYS Workbench软件中的流体力学模块CFX对建立的结构模型进行数值分析,得出气体的流量分布,对气体在不同实验工况下的分布进行模拟和分析。其次,一般流量测量装置对被测管道前后的直管段有一定的要求,当直管段不能满足要求时,需要考虑安装整流器来进行调整。文中以净烟气烟道为数值模拟实验模型,对整流器的形式、截面形状、高度、长度等因素对整流效果的影响及整流器的阻力特性进行数值模拟研究,为后续流量测量装置的精确测量提供依据。最后,设计出一种测量精度高,具有自清灰、差压信号放大等功能的自清灰全截面流量测量装置,对该测量装置的测量原理、结构设计、安装使用做了详细介绍。
[Abstract]:The coal-fired power plant is the main power supply Chinese, this situation will not change in a short time. Most of the coal-fired power plant boiler by burning pulverized coal power boiler, which two wind distribution affects the process of pulverized coal ignition and burnout, economy and reliability of this is directly related to the operation of power plant boiler flue gas flow and pollutant emissions. The amount of flue gas in the flue desulfurization system of power plant is an important environmental monitoring data. Therefore, the flow distribution characteristics of boiler two and flue gas in the flue duct and achieve accurate measurement of the flow is particularly important. Firstly, the structure design and parameters of power plant boiler two given and flue gas flue duct the three-dimensional modeling software Pro/E to establish a reasonable structure model. Using the CFX fluid mechanics module of ANSYS Workbench software in the structure of the model number Value analysis, get the distribution of gas flow, the simulation and analysis of gas distribution in different experimental conditions. Secondly, the general flow measurement device has certain requirements to be measured before and after the straight section of the pipeline, when the pipe can not meet the requirements, the need to consider the installation of the rectifier is adjusted. The numerical simulation with experimental model the net flue in Chinese, the rectifier in the form of shape, height, resistance characteristics influence on the rectification effect and the length of the rectifier is simulated, and provide the basis for the subsequent accurate measurement of flow measuring device. Finally, design a high precision measurement, self cleaning, self cleaning the whole section ash flow measuring device of differential pressure signal amplification function, measuring principle, the measuring device of the structure design, installation and use are introduced in detail.

【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773

【参考文献】