本文關鍵詞： 爐氣 凈化 仿真 文氏管　出處：《北京化工大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著我國能源、環(huán)境和資源問題日益突出,作為鋼鐵行業(yè)的節(jié)能減排工作任務艱巨。由于歷史和現(xiàn)實原因,我國鋼鐵行業(yè)轉(zhuǎn)爐煙氣凈化大多數(shù)仍然采用濕法工藝。對于轉(zhuǎn)爐煙氣濕法凈化工藝,其系統(tǒng)性能受到較多因素的影響。本文將針對某企業(yè)二級文氏管濕法凈化系統(tǒng),主要完成了如下工作：(1)構建包括冷卻煙道、第一文氏管、第一彎頭、第二文氏管、第二彎頭及風機的熱工計算關系式；(2)對文氏管阻力系數(shù)與文氏管幾何結構參數(shù)、運行參數(shù)等關系進行了曲線回歸,以便于計算程序的編制；(3)在C++平臺上,編制了計算程序的編制,實現(xiàn)濕法凈化系統(tǒng)熱工快速計算,并給出了150噸轉(zhuǎn)爐煙氣濕法凈化系統(tǒng)的熱工計算實例,分析了文氏管喉口開度對壓降、喉口速度和除塵效率的影響規(guī)律；(4)針對第一文氏管,構建了包括質(zhì)量、動量、能量、組分守恒方程.基于連續(xù)相和離散相耦合作用,考慮高溫煙氣與噴淋液滴的傳熱傳質(zhì),在Fluent平臺上對文氏管內(nèi)的流動和傳熱過程進行了數(shù)值模擬,獲得了文氏管內(nèi)部速度、壓力、溫度和水蒸氣的分布規(guī)律,數(shù)值模擬結果與開發(fā)的計算軟件的計算結果進行了對比,二者具有較好吻合度。轉(zhuǎn)爐煙氣濕法凈化系統(tǒng)性能計算軟件的開發(fā),可以克服手工計算時文氏管能量平衡的反復迭代,以實現(xiàn)快速計算,為現(xiàn)場操作人員進行操作提供了方向性指導。基于計算流體力學與傳熱數(shù)值模擬,有助于人們深入理解文氏管內(nèi)部的流動與傳熱過程,為提高文氏管除塵效率和降低阻力損失提供理論基礎。
[Abstract]:With the problems of energy, environment and resources becoming more and more prominent in China, the task of energy saving and emission reduction in steel industry is arduous. Most converter flue gas purification in iron and steel industry in China still adopts wet process. The system performance of converter flue gas purification process is affected by many factors. The main work is as follows: 1) Construction includes cooling flue, first Venturi pipe, first bend, second Venturi tube, second bend and blower. In order to facilitate the compilation of calculation program on C platform, the calculation program is compiled to realize the rapid calculation of thermal engineering in wet purification system. An example of thermal calculation of 150 ton converter flue gas purification system is given. The influence of throat opening on pressure drop, throat velocity and dust removal efficiency is analyzed. 4) for the first Venturi tube, the mass, momentum and energy are constructed. Component conservation equation. Based on the coupling of continuous phase and discrete phase, considering the heat and mass transfer between high temperature flue gas and spray droplet, the flow and heat transfer process in Venturi tube was numerically simulated on Fluent platform, and the internal velocity of Venturi tube was obtained. The distribution of pressure, temperature and water vapor, the numerical simulation results are compared with the calculated results of the developed calculation software. It can overcome repeated iterations of energy balance of Venturi tube in manual calculation to realize rapid calculation and provide directional guidance for field operators. Based on numerical simulation of computational fluid dynamics and heat transfer, It is helpful for people to understand the flow and heat transfer process in Venturi tube and to provide a theoretical basis for improving the dust removal efficiency and reducing the resistance loss of Venturi tube.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X757

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本文編號：1521599