本文選題：微型流化床 + 內(nèi)循環(huán)��； 參考：《化工學(xué)報(bào)》2017年10期

【摘要】：針對(duì)開(kāi)發(fā)適用于化學(xué)氣相沉積反應(yīng)動(dòng)力學(xué)研究的微型流化床反應(yīng)分析儀的應(yīng)用需求,研究了外徑為30 mm的內(nèi)循環(huán)微型流化床中氣固流動(dòng)特性,具體考察了中心射流管伸入高度、內(nèi)導(dǎo)流管直徑和顆粒裝載量對(duì)實(shí)現(xiàn)固體物料內(nèi)循環(huán)的最小操作氣速和導(dǎo)流管與環(huán)隙區(qū)間竄氣的影響。結(jié)果表明,隨著射流管伸入高度的增大,實(shí)現(xiàn)顆粒內(nèi)循環(huán)流動(dòng)的最小操作氣速變大;存在最優(yōu)的導(dǎo)流管直徑(20 mm),使得實(shí)現(xiàn)顆粒環(huán)流的最小操作氣速較小;增大顆粒裝載量有利于降低顆粒內(nèi)循環(huán)的最小操作氣速。通過(guò)檢測(cè)示蹤氣體在環(huán)隙區(qū)內(nèi)的質(zhì)譜信號(hào),發(fā)現(xiàn)在所考察的參數(shù)范圍內(nèi),反應(yīng)器底部不存在導(dǎo)流管區(qū)向環(huán)隙區(qū)的竄氣;在反應(yīng)器上部,由于顆粒對(duì)氣體的夾帶,環(huán)隙區(qū)上部總能檢測(cè)到示蹤氣體,且竄氣特性隨操作氣速的增大而增強(qiáng)。研究結(jié)果可為設(shè)計(jì)適用于化學(xué)氣相沉積反應(yīng)的內(nèi)循環(huán)微型流化床反應(yīng)器提供參考。
[Abstract]:In order to develop a micro fluidized bed reaction analyzer suitable for the study of chemical vapor deposition reaction kinetics, the gas-solid flow characteristics in an inner circulating micro fluidized bed with an external diameter of 30 mm were studied, and the height of the central jet tube was investigated in detail. The influence of the diameter of the inner diversion tube and the amount of particle loading on the minimum operating gas velocity and the gas channeling between the tube and the annular space for realizing the internal circulation of solid material. The results show that the minimum operating gas velocity increases with the increase of the inlet height of the jet tube, and the minimum operating gas velocity of the particle circulation is smaller because of the existence of an optimal diameter of 20 mm of the diversion tube. The increase of particle loading is beneficial to reduce the minimum operating gas velocity of the particle internal circulation. By detecting the mass spectrum signals of tracer gas in the annular gap region, it is found that there is no gas channeling from the diversion tube area to the annulus region at the bottom of the reactor in the range of parameters investigated, and in the upper part of the reactor, because of the entrainment of the particles to the gas, Tracer gas can always be detected in the upper part of the annulus, and the gas channeling characteristics increase with the increase of the operating gas velocity. The results can be used as a reference for the design of a micro fluidized bed reactor with internal circulation for chemical vapor deposition reaction.
【作者單位】： 中國(guó)科學(xué)院過(guò)程工程研究所多相復(fù)雜系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFF0102600) 中國(guó)科學(xué)院“百人計(jì)劃”項(xiàng)目(Y224051398)~~
【分類(lèi)號(hào)】：TQ051.13

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