發(fā)布時間：2018-05-23 20:58

  本文選題：電除塵器 + CFD��； 參考：《東北電力大學》2015年碩士論文

【摘要】：人類進入二十一世紀以來，隨著世界經(jīng)濟迅猛發(fā)展，能源的消耗不斷曾多，，使人們所居住的環(huán)境每況日下。其中空氣污染最為嚴重，造成空氣污染的罪魁禍首就是粉塵，而大多數(shù)粉塵來自電廠的排放，這就使燃燒產(chǎn)生的顆粒物的排放引起國內(nèi)外的廣泛關(guān)注。靜電除塵器作為電廠的主要除塵設備，如何提高電除塵器的除塵效率成為電除塵研究者所關(guān)注的熱點問題。電除塵器內(nèi)的氣流與粉塵顆粒的分布是影響電除塵器的重要因素。為優(yōu)化流場，研究粉塵顆粒在流場中的運動規(guī)律，本文采用CFD的方法對電除塵器內(nèi)的流場及氣固兩相流進行模擬計算，得到合理的模擬方法，為電除塵器內(nèi)氣流分布板的設計、調(diào)整和改造提供計算依據(jù)。對提高電除塵器的環(huán)境效益和經(jīng)濟效益均有重要意義。 本文在分析了國內(nèi)外關(guān)于電除塵器內(nèi)部流場和粉塵運動的基本原理的基礎上，運用商業(yè)軟件Fluent對一臺300MW的火電機組電除塵器進行模擬計算。首先，采用標準的k模型，基于SIMPLE算法對電除塵器的流場進行模擬并與實驗進行對比。在模擬過程中對于電除塵器的氣流分布板采用多孔介質(zhì)模型進行模擬，通過調(diào)整氣流分布板的開孔率，在電場內(nèi)形成均勻氣流流場與斜氣流流場。接著運用歐拉—拉格朗日方法，對連續(xù)相采用標準的k模型；對離散相采用離散相模型中隨機游走模型，進行雙相耦合模擬計算。并在此基礎上對兩種流場下粉塵顆粒的運動進行分析，并對細微顆粒進行模擬計算，對比分析兩種流場對顆粒運動的影響，發(fā)現(xiàn)斜氣流流場更有利于電除塵器對粉塵補集，提高除塵器除塵效率。然后，分析了兩種流場下風速對電除塵器內(nèi)顆粒運動及除塵效率的影響，得出風速越高除塵效果越差。數(shù)值模擬結(jié)果表明本模擬方法有一定的可靠性，可為電除塵器的設計和改造提供計算依據(jù)。同時證明斜氣流技術(shù)更有助于提高電除塵效率。
[Abstract]:Since the 21 century, with the rapid development of the world economy, the energy consumption has been increasing. Among them, the air pollution is the most serious, and the main culprit of air pollution is dust, and most of the dust comes from the emission of power plant, which makes the emission of particulate matter produced by combustion cause widespread concern at home and abroad. Electrostatic precipitator (ESP) is the main dedusting equipment in power plant. How to improve the efficiency of ESP has become a hot issue. The distribution of air and dust particles in ESP is an important factor affecting ESP. In order to optimize the flow field and study the movement law of dust particles in the flow field, the CFD method is used to simulate the flow field and gas-solid two-phase flow in the electrostatic precipitator. The reasonable simulation method is obtained, which is the design of the airflow distribution plate in the electrostatic precipitator. Adjustment and reconstruction provide basis for calculation. It is of great significance to improve the environmental and economic benefits of ESP. Based on the analysis of the basic principles of the internal flow field and dust movement of the electrostatic precipitator at home and abroad, the commercial software Fluent is used to simulate the electrostatic precipitator of a thermal power unit with 300MW. Firstly, the standard k model is used to simulate the flow field of ESP based on SIMPLE algorithm. In the process of simulation, the porous media model is used to simulate the air distribution plate of the electrostatic precipitator. By adjusting the opening rate of the gas distribution plate, the uniform flow field and the oblique flow field are formed in the electric field. Then the standard k model is used for the continuous phase and the random walk model in the discrete phase is used for the discrete phase by using the Euler-Lagrangian method. On this basis, the movement of dust particles under two flow fields is analyzed, and the fine particles are simulated and calculated. The effects of the two flow fields on the particle movement are compared and analyzed. It is found that the oblique flow field is more favorable to the dust collection of the electrostatic precipitator. Improve the dust removal efficiency of the dust collector. Then, the effect of wind speed on particle movement and dust removal efficiency in electrostatic precipitator is analyzed. It is concluded that the higher the wind speed is, the worse the dust removal efficiency is. The numerical simulation results show that the simulation method is reliable and can provide the basis for the design and renovation of the electrostatic precipitator. At the same time, it is proved that the oblique airflow technology is more helpful to improve the efficiency of electric dust collection.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X701.2

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本文編號：1926366