【摘要】：粉煤加壓密相輸運(yùn)床氣化技術(shù)是我國發(fā)展IGCC和多聯(lián)產(chǎn)的重要技術(shù)選擇。密相輸運(yùn)床反應(yīng)器內(nèi)的氣固兩相流動(dòng)行為非常復(fù)雜,提升管內(nèi)的氣固流動(dòng)屬于密相懸浮上升流,立管內(nèi)的氣固流動(dòng)則屬于非流態(tài)化的移動(dòng)床流動(dòng)。由于不同流型的流動(dòng)特征明顯不同,已有相似性研究多針對(duì)于鼓泡流態(tài)化和快速流態(tài)化,需對(duì)密相輸運(yùn)床的氣固流動(dòng)相似性進(jìn)行研究,分析適用的相似準(zhǔn)則,通過實(shí)驗(yàn)和模型研究對(duì)其有效性進(jìn)行驗(yàn)證,以為裝置的設(shè)計(jì)和放大提供參考。本文在冷態(tài)和熱態(tài)實(shí)驗(yàn)的基礎(chǔ)上,對(duì)密相輸運(yùn)床提升管、立管開展相似性研究及系統(tǒng)壓力平衡建模,主要結(jié)果如下：1.針對(duì)密相輸運(yùn)床提升管和立管所處的不同流型,采用因次分析的方法,從流動(dòng)基本方程出發(fā),分別得到了適用于密相懸浮上升流和負(fù)壓差下行移動(dòng)床的氣固流動(dòng)相似準(zhǔn)則。同時(shí)得到了返料閥部分的氣固流動(dòng)相似準(zhǔn)則。其中,Ar數(shù)是影響氣固兩相相間作用力的重要物性參數(shù),在進(jìn)行實(shí)驗(yàn)時(shí)應(yīng)首先選擇Ar數(shù)相同或相近的物性條件,再根據(jù)提升管和立管的不同流動(dòng)相似準(zhǔn)則設(shè)計(jì)相應(yīng)的操作條件。2.根據(jù)分析得到的密相懸浮上升流氣固流動(dòng)相似準(zhǔn)則,選取適合的固體顆粒及氣體進(jìn)行了流動(dòng)實(shí)驗(yàn)。在較寬的操作范圍內(nèi),對(duì)提升管中Geldart B類石英砂顆粒的流動(dòng)行為進(jìn)行了研究。在高固體循環(huán)流率條件下,充分發(fā)展段的表觀固體濃度可超過0.07,滿足密相懸浮上升流的條件。由于氣體沿軸向存在明顯的膨脹加速,固體濃度仍然呈下濃上稀的非均勻分布,但不出現(xiàn)快速流態(tài)化條件下的典型S形分布。當(dāng)前文分析得到的相似準(zhǔn)則數(shù)相同或相近時(shí),固體濃度和固體速度呈現(xiàn)相似的分布形式,表明應(yīng)用有關(guān)相似準(zhǔn)則可以實(shí)現(xiàn)密相輸運(yùn)床提升管內(nèi)的氣固流動(dòng)相似。將實(shí)驗(yàn)數(shù)據(jù)與理論分析結(jié)合,得到用于計(jì)算密相懸浮上升流參數(shù)分布的流動(dòng)模型�；谧饔昧Ψ纸獾姆椒ń⒘颂嵘軞夤塘鲃�(dòng)模型,模型計(jì)算得到的提升管壓降與實(shí)驗(yàn)結(jié)果吻合較好。3.基于非流態(tài)化氣固兩相流的經(jīng)驗(yàn)關(guān)系式,結(jié)合密相輸運(yùn)床立管流動(dòng)特點(diǎn),得到了負(fù)壓差下行移動(dòng)床的氣固流動(dòng)模型。由模型計(jì)算得到的立管軸向壓力分布和空隙率分布情況與理論分析一致。由于實(shí)驗(yàn)物料的物性參數(shù)和實(shí)驗(yàn)裝置充氣位置的布置形式與理想狀態(tài)存在差異,進(jìn)行實(shí)驗(yàn)時(shí)實(shí)際通入的松動(dòng)風(fēng)流量比計(jì)算值偏大。根據(jù)本文研究獲得的相似準(zhǔn)則,計(jì)算了不同物料在不同操作條件下的立管空隙率和壓力梯度分布情況,結(jié)果表明各計(jì)算工況下的立管移動(dòng)床的氣固流動(dòng)表現(xiàn)出相似性。4.將提升管和立管模型結(jié)合,對(duì)系統(tǒng)壓力平衡進(jìn)行分析。建立了適合于密相輸運(yùn)床的系統(tǒng)壓力平衡模型,能夠較準(zhǔn)確地對(duì)提升管內(nèi)固體濃度分布進(jìn)行描述。通過進(jìn)一步對(duì)于系統(tǒng)結(jié)構(gòu)的分析表明,增大立管和提升管直徑比及顆粒密度均有利于增大立管壓降,從而獲得更大的返料驅(qū)動(dòng)力。
[Abstract]:The pressurized dense phase transport bed gasification technology of pulverized coal is an important technical choice for developing IGCC and multiple cogeneration in China. The gas-solid two-phase flow behavior in a dense transport bed reactor is very complex. The gas-solid flow in the riser belongs to the dense phase suspended upwelling flow, while the gas-solid flow in the vertical pipe belongs to the non-fluidized moving bed flow. Because the flow characteristics of different flow patterns are obviously different, the similarity studies have been mainly focused on bubbling fluidization and rapid fluidization. It is necessary to study the similarity of gas-solid flow in dense phase transport bed and analyze the applicable similarity criteria. The validity of the device is verified by experiments and model studies, which provides a reference for the design and amplification of the device. In this paper, on the basis of cold and hot state experiments, the similarity study and pressure balance modeling of riser and riser in dense phase transport bed are carried out. The main results are as follows: 1. According to the different flow patterns of the lifting tube and the riser in the dense phase transport bed, the similarity criteria of gas-solid flow for the dense phase suspended upwelling bed and the negative pressure differential downward moving bed are obtained by using the dimensionality analysis method and starting from the basic flow equation. At the same time, the similarity criterion of gas-solid flow in the return valve is obtained. The ar number is an important physical parameter which affects the interaction force between gas and solid phases. In the experiment, the same or similar physical property conditions with the same Ar number should be selected, and the corresponding operating conditions should be designed according to the different flow similarity criteria of the riser and riser. According to the similarity criterion of gas-solid flow in dense phase suspended upward flow, the flow experiments were carried out by selecting suitable solid particles and gases. The flow behavior of Geldart B quartz sand particles in the riser was studied in a wide operating range. Under the condition of high solid circulation rate, the apparent solid concentration of the fully developed phase can exceed 0.07, which satisfies the condition of dense phase suspension upwelling. Due to the obvious expansion and acceleration of the gas along the axial direction, the concentration of the solid is still distributed inhomogeneously with lower concentration, but there is no typical S-shaped distribution under the condition of rapid fluidization. At present, when the number of similarity criteria is the same or similar, the distribution of solid concentration and velocity is similar, which indicates that the similarity criterion can be used to realize the similarity of gas-solid flow in the riser of dense phase transport bed. By combining the experimental data with theoretical analysis, a flow model for calculating the parameter distribution of dense phase levitation upwelling is obtained. The gas-solid flow model of the riser is established based on the method of force decomposition. The calculated pressure drop of the riser is in good agreement with the experimental results. Based on the empirical expression of non-fluidized gas-solid two-phase flow and combined with the characteristics of vertical pipe flow in dense phase transport bed, a gas-solid flow model for moving bed with negative pressure difference is obtained. The axial pressure distribution and voidage distribution obtained from the model are consistent with the theoretical analysis. Due to the difference between the physical property parameters of the experimental material and the arrangement of the inflatable position of the experimental device and the ideal state, the calculated value of the actual flow rate of the loosening air in the experiment is larger than the calculated value. According to the similarity criterion obtained in this paper, the void rate and pressure gradient distribution of riser under different operating conditions are calculated. The results show that the gas-solid flow of riser moving bed under different working conditions shows a similarity of .4. The pressure balance of the system is analyzed by combining the riser model with the riser model. A pressure balance model suitable for dense phase transport bed is established, which can accurately describe the distribution of solid concentration in the riser. Through further analysis of the system structure, it is shown that increasing the diameter ratio of riser and particle density can increase the pressure drop of riser and obtain a greater return driving force.
【學(xué)位授予單位】：中國科學(xué)院研究生院(工程熱物理研究所)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ051.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 呂亮功;;干氣作提升管預(yù)提升介質(zhì)的效果[J];石油煉制與化工;1992年11期

2 鈕根林,楊朝合,徐春明,山紅紅,張建芳;重油催化裂化裝置提升管內(nèi)反應(yīng)歷程研究[J];燃料化學(xué)學(xué)報(bào);2002年03期

3 王瑜,鈕根林,杜峰,孫昱東,楊朝合,徐春明;重油催化裂化裝置提升管在線取樣研究[J];石油大學(xué)學(xué)報(bào)(自然科學(xué)版);2002年05期

4 劉會(huì)娥,楊艷輝,魏飛,金涌;提升管-下行床耦合反應(yīng)器內(nèi)顆�；旌闲袨閇J];化工學(xué)報(bào);2002年03期

5 楊開研,牛芬萍,趙永明;FCCU提升段操作對(duì)反應(yīng)的影響[J];天然氣與石油;2005年02期

6 蔡飛鵬,宋文惠,孫國剛,時(shí)銘顯;提升管內(nèi)多股交叉射流的數(shù)值模擬[J];石油大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年04期

7 王向輝;高士秋;宋文立;許友好;張久順;;操作條件對(duì)雙循環(huán)回路變徑提升管壓降的影響[J];過程工程學(xué)報(bào);2006年06期

8 譚宏濤;董干國;魏耀東;時(shí)銘顯;;γ射線衰減技術(shù)在提升管內(nèi)顆粒濃度測(cè)量上的應(yīng)用[J];過程工程學(xué)報(bào);2007年05期

9 董艷紅;;優(yōu)化提升管劑油接觸狀態(tài),達(dá)到最佳效果[J];應(yīng)用能源技術(shù);2008年05期

10 姚文濤;;雙提升管工藝在重油催化裂化裝置的應(yīng)用[J];山東化工;2009年06期

相關(guān)會(huì)議論文 前10條

1 宮海峰;楊朝合;徐令寶;劉熠斌;;新型變徑提升管壓力變換規(guī)律研究[A];山東石油學(xué)會(huì)煉制委員會(huì)2009年技術(shù)交流會(huì)論文集[C];2009年

2 范怡平;時(shí)銘顯;葉盛;盧春喜;孫國剛;;多股射流在提升管內(nèi)的擴(kuò)散與流動(dòng)[A];中國顆粒學(xué)會(huì)2002年年會(huì)暨海峽兩岸顆粒技術(shù)研討會(huì)會(huì)議論文集[C];2002年

3 王向輝;高士秋;宋文立;許友好;張久順;;雙循環(huán)變徑提升管內(nèi)流動(dòng)特性的研究[A];第一屆全國化學(xué)工程與生物化工年會(huì)論文摘要集(上)[C];2004年

4 王文婷;馬達(dá);;催化裂化裝置兩段提升管的技術(shù)改造[A];第1屆全國工業(yè)催化技術(shù)及應(yīng)用年會(huì)論文集[C];2004年

5 范怡平;楊志義;許棟五;盧春喜;時(shí)銘顯;徐春明;;催化裂化提升管進(jìn)料段內(nèi)油劑兩相流動(dòng)混合的優(yōu)化及工業(yè)應(yīng)用[A];中國顆粒學(xué)會(huì)2006年年會(huì)暨海峽兩岸顆粒技術(shù)研討會(huì)論文集[C];2006年

6 雷世遠(yuǎn);張振千;;新型RFCC進(jìn)料段技術(shù)研究[A];中國顆粒學(xué)會(huì)2006年年會(huì)暨海峽兩岸顆粒技術(shù)研討會(huì)論文集[C];2006年

7 ;減一線、常三線等進(jìn)提升管回?zé)拰?duì)催化產(chǎn)品的影響[A];山東石油學(xué)會(huì)煉制委員會(huì)2009年技術(shù)交流會(huì)論文集[C];2009年

8 李天津;陳鳳;何學(xué)東;陳文勝;羅杰;黃志勇;;吸收球氣力輸送提升管固相附加壓損試驗(yàn)研究[A];中國核科學(xué)技術(shù)進(jìn)展報(bào)告（第二卷）——中國核學(xué)會(huì)2011年學(xué)術(shù)年會(huì)論文集第3冊(cè)（核能動(dòng)力分卷（下））[C];2011年

9 阮宇軍;盧春喜;時(shí)銘顯;;不同粒度分布高硫焦顆粒在新型組合提升管燃燒器內(nèi)流動(dòng)特性的研究[A];第九屆全國化學(xué)工藝學(xué)術(shù)年會(huì)論文集[C];2005年

10 胡彥濤;楊欣靜;;小流量空氣提升應(yīng)用于料液輸送的可行性研究[A];中國核學(xué)會(huì)核化工分會(huì)成立三十周年慶祝大會(huì)暨全國核化工學(xué)術(shù)交流年會(huì)會(huì)議論文集[C];2010年

相關(guān)重要報(bào)紙文章 前6條

1 記者 羅全;創(chuàng)新社會(huì)管理 提升管控水平[N];兵團(tuán)日?qǐng)?bào)(漢);2012年

2 本報(bào)記者 劉玉t，

本文編號(hào)：2234093