【摘要】：氣力提升作為一種新興技術(shù),在礦漿提升、河道清淤、石油和化工液體輸送等領(lǐng)域中廣泛應(yīng)用。其常規(guī)特性已得到較為深入的研究,但非均勻介質(zhì)的氣力提升理論涉獵較少。針對(duì)于此,本文提出采用氣力提升非均勻顆粒的構(gòu)想,從實(shí)驗(yàn)角度入手,結(jié)合理論建模揭示其提升機(jī)理。為研究顆粒提升規(guī)律,根據(jù)牛頓第二定律和流體力學(xué)基本理論,建立了顆粒提升臨界模型,獲得臨界速度隨粒徑的變化趨勢(shì)。在此基礎(chǔ)上,根據(jù)動(dòng)量守恒定律和多相流理論建立提升管內(nèi)氣液固三相流速度模型,分析管內(nèi)軸向壓力、各相相含率和真實(shí)速度的分布規(guī)律,從而得出氣、液、固三相折算速度的關(guān)系,進(jìn)一步分析粒徑、顆粒濃度和浸入率等參數(shù)對(duì)提升性能的影響規(guī)律。此外,基于能量守恒定律建立提升效率模型,分析進(jìn)氣量、浸入率和顆粒濃度等因素的相互作用機(jī)制及其對(duì)效率的影響規(guī)律。為驗(yàn)證理論模型的可靠性,以粒徑為2mm和5mm的麥飯石陶瓷顆粒為介質(zhì),實(shí)驗(yàn)研究不同進(jìn)氣量QG、浸入率γ、粒徑dS、顆粒濃度αS和顆�；旌媳圈南�,揚(yáng)水量QL、揚(yáng)固量QS和提升效率η的變化規(guī)律。理論分析與實(shí)驗(yàn)測(cè)試結(jié)果表明:臨界速度隨顆粒尺寸增大而增大,隨浸入率升高而減小。而在實(shí)驗(yàn)中則發(fā)現(xiàn)臨界氣量值隨浸入率上升呈遞減趨勢(shì),隨顆粒尺寸增大呈上升趨勢(shì)。揚(yáng)固量和提升效率均隨浸入率升高而增高,隨粒徑增大而下降,存在最佳氣量值使得揚(yáng)固量與提升效率處于峰值。揚(yáng)固量隨顆粒濃度增加而上揚(yáng),但提升效率則與之相反。在恒定顆粒濃度下,揚(yáng)固特性和提升效率隨混合比的增大(細(xì)顆粒含量增多)而上揚(yáng);粗顆粒受浸入率的影響較細(xì)顆粒大。理論分析與實(shí)驗(yàn)結(jié)果相吻合。
[Abstract]:As a new technology, Pneumatic lifting is widely used in the fields of slurry lifting, river desilting, petroleum and chemical liquid transportation. The conventional characteristics have been deeply studied, but the pneumatic lifting theory of inhomogeneous medium is less. In this paper, the idea of lifting non-uniform particles with pneumatic force is put forward, and the lifting mechanism is revealed from the point of view of experiment and theoretical modeling. In order to study the law of particle lifting, according to Newton's second law and the basic theory of fluid mechanics, the critical model of particle lifting is established, and the variation trend of critical velocity with particle size is obtained. Based on the momentum conservation law and the multiphase flow theory, the velocity model of gas-liquid-solid three-phase flow in the riser is established, and the distribution of axial pressure, phase holdup and real velocity in the pipe are analyzed, and the gas and liquid are obtained. The effect of particle size, particle concentration and immersion rate on the lifting performance was analyzed. In addition, based on the law of conservation of energy, an efficiency model is established to analyze the interaction mechanism of air intake, immersion rate and particle concentration and its effect on efficiency. In order to verify the reliability of the theoretical model, the immersion ratio 緯 of QG, the concentration of dS, particles 偽 S and the mixing ratio 未 of dS, particles of different air intake were studied in the medium of Mailanshi ceramic particles with diameter of 2mm and 5mm. The variation law of QL, lift amount QS and lift efficiency 畏. The theoretical analysis and experimental results show that the critical velocity increases with the increase of particle size and decreases with the increase of immersion rate. In the experiment, it is found that the critical gas volume decreases with the increase of immersion rate and increases with the increase of particle size. Both the lifting rate and the lifting efficiency increased with the increase of the immersion rate and decreased with the increase of the particle size. The amount of lifting solid increased with the increase of particle concentration, but the efficiency was opposite. Under the constant particle concentration, the lifting characteristics and lifting efficiency increased with the increase of mixing ratio (the content of fine particles), and the influence of the infiltration rate of coarse particles was greater than that of fine particles. The theoretical analysis is in agreement with the experimental results.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD53

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 楊林;唐川林;張鳳華;;地下礦產(chǎn)鉆孔水力開采技術(shù)及其應(yīng)用[J];地下空間與工程學(xué)報(bào);2006年04期

2 廖振方,陳德淑,鄧曉剛,李軍,楊昌林,王紅霞,趙建新;三峽庫區(qū)疏浚及清淤用機(jī)電一體化成套氣舉裝置[J];重慶大學(xué)學(xué)報(bào)(自然科學(xué)版);2003年03期

3 唐川林,廖振方;濱海砂礦開采新方法的研究[J];重慶大學(xué)學(xué)報(bào)(自然科學(xué)版);1999年03期

4 沈榮春;束忠明;黃發(fā)瑞;戴迎春;;氣升式環(huán)流反應(yīng)器內(nèi)氣液兩相流動(dòng)計(jì)算流體力學(xué)的模擬[J];華東理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年01期

5 鄒偉生;黃家楨;;大洋錳結(jié)核深海開采揚(yáng)礦技術(shù)[J];礦冶工程;2006年03期

6 孫波;孫立成;劉靖宇;田道貴;;豎直較大管徑內(nèi)氣液兩相流截面含氣率實(shí)驗(yàn)研究[J];水動(dòng)力學(xué)研究與進(jìn)展A輯;2012年01期

7 張士林;;漿體管道低速段水力坡度的研究[J];水力采煤與管道運(yùn)輸;2011年03期

8 楊宇平;楊成新;董建輝;李龍;李彥琴;楊澤星;蔣歡;孫金聲;;水平井、大位移井井眼凈化技術(shù)研究[J];石油機(jī)械;2012年08期

9 胡東;唐川林;廖振方;;基于動(dòng)量定理的氣舉提升系統(tǒng)建模與分析[J];排灌機(jī)械工程學(xué)報(bào);2012年05期

相關(guān)博士學(xué)位論文 前1條

1 裴江紅;鉆孔水力開采中氣力提升系統(tǒng)的特性[D];重慶大學(xué);2010年

相關(guān)碩士學(xué)位論文 前2條

1 劉永輝;氣舉系統(tǒng)效率評(píng)價(jià)方法研究[D];西南石油學(xué)院;2002年

2 谷曉娟;污水處理廠污水和污泥氣力提升系統(tǒng)的研究與應(yīng)用[D];華南理工大學(xué);2013年

，

本文編號(hào)：2290525