【摘要】：蒸汽流量的精確測量在能源的節(jié)約、社會經(jīng)濟效益的提高等方面具有重要作用,尤其是在火力發(fā)電廠占主要地位的中國供電企業(yè),過熱水蒸氣的準確計量具有非常重要的意義,尤其對鍋爐主蒸汽流量測量的精度和內容等都有很嚴格的要求,因此研究過熱水蒸氣質量流量測量非常有必要。論文主要是針對過熱蒸汽中火電機組蒸汽質量流量測量進行研究。由于高參數(shù),大容量機組的不斷投產,原有的流量測量方式面臨著壓力損失大、準確度不高、壽命短等問題。同時,應用弗留格爾公式進行測量又面臨著精度低等缺陷。在這樣的背景下,就必須采用新的設計思路,設計新型的質量流量裝置進行測量。論文設計采用射流流量計進行主蒸汽質量流量測量。首先研究過熱蒸汽中火電機組主蒸汽流量的測量方法和射流流量計的結構及原理。然后設計射流流量計的幾何尺寸和形狀,并用GAMBIT軟件對流量計進行二維模型的建立,并在模型基礎上設置了一個新的壓力測點,并利用流體計算軟件FLUENT對機組定壓運行時不同質量流量下的流體進行仿真分析,結果表明新的壓力測點效果好,而且主蒸汽質量流量與射流流量計振蕩頻率線性度好,改進的射流流量計可用于主蒸汽質量流量測量。最后對不同尺寸的射流流量計進行仿真分析,研究了射流流量計入口尺寸對流體振蕩頻率、壓力損失的影響,針對大型機組質量流量的測量設計出了一種效果較好的射流流量計。
[Abstract]:The accurate measurement of steam flow plays an important role in saving energy and improving social and economic benefits, especially in the power supply enterprises in China, where superheated water vapor is measured accurately. Especially, there are strict requirements for the accuracy and content of boiler main steam flow measurement, so it is very necessary to study the measurement of superheated steam mass flow. This paper mainly focuses on the measurement of steam mass flow of thermal power units in superheated steam. Due to high parameters and continuous production of large capacity units, the original flow measurement mode is faced with the problems of large pressure loss, low accuracy, short life and so on. At the same time, the use of Fligel formula for measurement is faced with low accuracy and other defects. In this context, a new design idea must be adopted to design a new mass flow device for measurement. In this paper, a jet Flowmeter is used to measure the mass flow of main steam. Firstly, the measurement method of main steam flow and the structure and principle of jet Flowmeter are studied. Then the geometry and shape of the jet Flowmeter are designed, and the two-dimensional model of the Flowmeter is built with GAMBIT software, and a new pressure measuring point is set up on the basis of the model. The simulation analysis of fluid at different mass flow rate at constant pressure is carried out by using the fluid calculation software FLUENT. The results show that the new pressure measuring point has good effect, and the main steam mass flow has good linearity with the oscillation frequency of jet Flowmeter. The improved jet Flowmeter can be used to measure the mass flow of main steam. Finally, the influence of the inlet dimension of the jet Flowmeter on the fluid oscillation frequency and pressure loss is studied by simulation and analysis of the different sizes of the fluidic Flowmeter. An effective jet Flowmeter is designed for mass flow measurement of large units.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TH814

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本文編號：2376073