本文選題：高效空氣過濾器 + 氣流分布一致性　； 參考：《東華大學(xué)》2013年碩士論文

【摘要】：高效空氣過濾器(HEPA)作為潔凈技術(shù)行業(yè)的核心設(shè)備,其效率的提升、性能的優(yōu)化對(duì)與其相關(guān)行業(yè)的發(fā)展有著重大的意義。近年來其發(fā)展引起了諸多國(guó)家的重視,低阻高效成了空氣過濾器發(fā)展共同的主題。鑒于新型濾材的高昂價(jià)格及低碳環(huán)保的要求,合理、充分利用濾料,提高其整體使用壽命顯得非常必要。 目前,HEPA多存在以下兩個(gè)方面的瑕疵：因均流板設(shè)計(jì)不合理引起的迎風(fēng)面入口流量分布不均勻的現(xiàn)象,從而導(dǎo)致濾料得不到最優(yōu)化的利用；過濾器檢漏發(fā)塵方式的不合理,使得氣溶膠大量殘留對(duì)過濾器壽命造成挑戰(zhàn),同時(shí)存在目標(biāo)氣溶膠時(shí)間不一致性和污染環(huán)境的潛在可能。 本課題將基于目前已經(jīng)廣泛使用的數(shù)值模擬計(jì)算技術(shù),對(duì)上述兩個(gè)問題展開分析。本文的基本思路是：立足于相應(yīng)的假設(shè)和簡(jiǎn)化,借助CAD進(jìn)行過濾器三維建模,采用GAMBIT進(jìn)行網(wǎng)格處理,最終通過FLUENT軟件進(jìn)行數(shù)值計(jì)算。為驗(yàn)證數(shù)值模擬方式中模型的合理性、邊界條件選取的準(zhǔn)確性,本文還開展了相應(yīng)的對(duì)照試驗(yàn),并通過試驗(yàn)與模擬的對(duì)比最終確定了數(shù)值模擬過程中：湍流模型采用標(biāo)準(zhǔn)κ-ε模型、濾料采用多孔介質(zhì)模型及速度入口、壓力出口邊界定義的合理性。 對(duì)于無隔板高效空氣過濾器,在靜壓箱尺寸一定的情況下,過濾器入口流速分布的一致性主要受均流板影響,而均流板的幾何結(jié)構(gòu)、幾何尺寸、安裝高度、開孔孔徑、孔間距等都在不同程度上影響著均流板的性能。本文對(duì)均流板性能的主要影響因素：大小、開孔率、安裝高,用正交試驗(yàn)法進(jìn)行模擬實(shí)驗(yàn)設(shè)計(jì),建立不同過濾器物理模型,對(duì)常用的2000m3/h、1500m3/h、1000m3/h及500m3/h過濾器模型分別開展了試驗(yàn)研究。 對(duì)于過濾器檢漏中的氣溶膠發(fā)生方式,本文先開展了不同“點(diǎn)源”發(fā)塵的實(shí)驗(yàn)研究,驗(yàn)證了多點(diǎn)發(fā)塵有利于縮短混合距離；繼而進(jìn)行了不同數(shù)目點(diǎn)源、相對(duì)于氣流流向的順流、逆流、垂直流三種發(fā)塵方向的多組模擬試驗(yàn)研究。模型等的建立、處理沿襲了速度分布一致性的相方法。 本課題采用速度(濃度)分布的相對(duì)誤差和不均勻度作為評(píng)價(jià)指標(biāo)。結(jié)果表明：對(duì)于不同的過濾器模型,均流板的設(shè)計(jì)應(yīng)有不同的方式,不能單獨(dú)依照經(jīng)驗(yàn)。對(duì)于2000m3/h過濾器模型,其入口氣流的一致性主要受均流板大小影響,最優(yōu)安裝高度為50mm,而其余三種風(fēng)量模型入口氣流一致性主要由均流板開孔率決定。對(duì)于氣溶膠的混合,當(dāng)發(fā)塵“點(diǎn)源”的數(shù)目足夠多時(shí),在有限的靜壓空間內(nèi)是能夠混合均勻的,當(dāng)然有擾流的情況下更能夠加速氣溶膠的混合均勻。
[Abstract]:As the core equipment of clean technology industry, HEPA (High efficiency Air filter) is of great significance to the development of related industries with the improvement of its efficiency and the optimization of its performance. In recent years, its development has attracted the attention of many countries, low resistance and high efficiency has become the common theme of air filter development. In view of the high price of new filter material and the requirement of low carbon environmental protection, it is very necessary to make full use of filter material and improve its whole service life. At present, HEPA has the following two defects: the phenomenon that the inlet flow distribution is not uniform due to the unreasonable design of the uniform flow plate, which leads to the unoptimized utilization of the filter material, and the unreasonable method of filter leakage dusting, A large amount of aerosol residues pose a challenge to the filter life, and there is a potential for target aerosol time inconsistency and environmental pollution. Based on the widely used numerical simulation techniques, the above two problems are analyzed in this paper. The basic idea of this paper is: based on the corresponding assumptions and simplification, the filter 3D modeling is carried out with the help of CAD, the mesh processing is done by GAMBIT, and the numerical calculation is carried out through FLUENT software. In order to verify the rationality of the model and the accuracy of the selection of boundary conditions in the numerical simulation mode, a corresponding comparative experiment was carried out in this paper. Through the comparison between the experiment and the simulation, the rationality of the definition of the boundary of the pressure outlet and the boundary of the pressure outlet is finally determined by comparing the results of the experiment and the simulation. For the high efficiency air filter without diaphragm, the uniformity of flow velocity distribution at the inlet of the filter is mainly affected by the uniform flow plate, and the geometric structure, geometric size, installation height, aperture of the orifice of the uniform flow plate, when the size of the static pressure box is fixed, is mainly affected by the flow sharing plate. The hole spacing affects the performance of the plate to some extent. In this paper, the main factors that affect the performance of the flow sharing plate, such as size, opening rate and high installation, are simulated and designed by orthogonal test method, and different filter physical models are established. The commonly used 2000m3 / 1 500m3 / h and 500m3/h filter models are tested and studied respectively. For the aerosol generation in filter leak detection, the experimental study of different "point source" dusts is carried out, which proves that multi-point dust emission is beneficial to shorten the mixing distance, and then different number of point sources, relative to the downstream flow of air flow, are carried out. A multi-group simulation study of three dusting directions for countercurrent and vertical flow. The establishment of the model deals with the phase method that follows the consistency of velocity distribution. The relative error and unevenness of velocity (concentration) distribution are used as evaluation indexes. The results show that the flow sharing plate should be designed in different ways for different filter models. For the 2000m3/h filter model, the consistency of inlet airflow is mainly affected by the size of the flow sharing plate, and the optimal installation height is 50mm, while the inlet airflow consistency of the other three air volume models is mainly determined by the orifice rate of the flow sharing plate. For aerosol mixing, when the number of dust "point sources" is large enough, it can be mixed uniformly in a limited static pressure space, and of course, it can accelerate the mixing uniformity of aerosol in the case of disturbing flow.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU834.83

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孫德興;水力直徑作為當(dāng)量直徑的適用范圍、缺欠與修正[J];工程熱物理學(xué)報(bào);1987年04期

2 陳樂端;韓云龍;錢付平;;高效空氣過濾器內(nèi)部氣相流場(chǎng)的數(shù)值研究[J];過濾與分離;2009年01期

3 陳長(zhǎng)琦;夏中亮;唐景春;王鐵軍;;基于CFD的潔凈手術(shù)室速度場(chǎng)的數(shù)值模擬[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年08期

4 李巖;郭春梅;;輻流潔凈室氣流形態(tài)的研究[J];建筑熱能通風(fēng)空調(diào);2007年02期

5 郭建芬,徐小浩,張凱;0.1μmULPA過濾器和低阻HEPA過濾器的開發(fā)[J];潔凈與空調(diào)技術(shù);2001年01期

6 張鋒超;曹家樅;;多管式高效空氣過濾器內(nèi)流動(dòng)的數(shù)值模擬[J];潔凈與空調(diào)技術(shù);2007年02期

7 李子麟;100級(jí)管道式過濾結(jié)構(gòu)潔凈通道的研制[J];暖通空調(diào);1996年03期

8 劉亞鋒;;氣溶膠凝聚粒子的分形模擬[J];陜西理工學(xué)院學(xué)報(bào)(自然科學(xué)版);2012年03期

9 劉俊杰,涂光備,馬九賢;風(fēng)機(jī)過濾器機(jī)組的不同均流裝置的研究(英文)[J];Transactions of Tianjin University;2002年02期

10 韓春華;;高效過濾器安裝后的現(xiàn)場(chǎng)檢漏方法[J];醫(yī)藥工程設(shè)計(jì);2007年05期

相關(guān)博士學(xué)位論文 前1條

1 凌繼紅;手術(shù)室空氣凈化效果的研究[D];天津大學(xué);2005年

相關(guān)碩士學(xué)位論文 前8條

1 苗利婷;高效空氣過濾器性能及其測(cè)試系統(tǒng)研究[D];東北大學(xué);2009年

2 李淮穎;新型多管式高效空氣過濾器的應(yīng)用研究[D];東華大學(xué);2004年

3 陳可;置換通風(fēng)對(duì)懸浮顆粒分布影響的數(shù)值模擬[D];湖南大學(xué);2005年

4 王科;潔凈室氣流組織模擬及優(yōu)化[D];華中科技大學(xué);2005年

5 張鋒超;多管式高效空氣過濾器的數(shù)值模擬研究[D];東華大學(xué);2006年

6 郭長(zhǎng)勇;潔凈手術(shù)室氣流組織的分析研究[D];北京工業(yè)大學(xué);2006年

7 王浩;旋風(fēng)分離器內(nèi)兩相流動(dòng)的數(shù)值模擬研究[D];蘭州理工大學(xué);2007年

8 來蘇;氣溶膠與高效過濾器現(xiàn)場(chǎng)檢測(cè)相關(guān)問題的應(yīng)用研究[D];東華大學(xué);2008年

，

本文編號(hào)：1940856