本文選題：上進(jìn)風(fēng) + 袋式除塵器　； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：目前,超細(xì)顆粒物是危害人體健康和污染大氣環(huán)境的主要因素。隨著國(guó)家對(duì)于超細(xì)顆粒物的控制越來(lái)越嚴(yán)格,作為一種對(duì)超細(xì)顆粒物具有高效去除效率的除塵設(shè)備,袋式除塵器將會(huì)有更加廣闊的應(yīng)用前景。本文基于FLUENT軟件包對(duì)某公司實(shí)驗(yàn)平臺(tái)的大型上進(jìn)風(fēng)袋式除塵器內(nèi)流場(chǎng)進(jìn)行了數(shù)值模擬及優(yōu)化研究,主要內(nèi)容包括四部分。首先,對(duì)上進(jìn)風(fēng)袋式除塵器內(nèi)流場(chǎng)進(jìn)行數(shù)值模擬研究,發(fā)現(xiàn)氣流在袋室中分配不均勻,靠近進(jìn)氣室的濾袋容易破損,同時(shí)不同濾袋直徑對(duì)袋式除塵器性能的影響需要進(jìn)一步探究。第二,考察不同濾袋數(shù)目對(duì)上進(jìn)風(fēng)袋式除塵器內(nèi)流場(chǎng)的影響。綜合分析不同過(guò)濾速度下的流量分配系數(shù)、最大流量不均幅值、氣流跡線、濾袋表面速度分布與壓力損失等指標(biāo)。結(jié)果表明:濾袋數(shù)為76個(gè)時(shí),氣流分布最為均勻,各濾袋負(fù)載均衡;相同過(guò)濾速度下,袋式除塵器的壓降隨濾袋數(shù)目的增加而上升,即壓降大小順序?yàn)?288847672;與72個(gè)濾袋相比,76個(gè)濾袋的可用過(guò)濾面積更大,綜合考慮,袋式除塵器的最優(yōu)濾袋數(shù)目為76個(gè)。第三,考察不同濾袋直徑(Φ150和Φ130)對(duì)上進(jìn)風(fēng)袋式除塵器內(nèi)流場(chǎng)的影響。綜合分析濾袋流量分配系數(shù)、袋式除塵器箱體截面(Z=3300mm、5800mm)的速度和壓力分布。結(jié)果發(fā)現(xiàn),相比Φ150和Φ130兩種濾袋混合布置,采用同一直徑的濾袋后,袋室中各排濾袋的氣流分配更加均衡,各橫截面的速度和壓力呈對(duì)稱(chēng)均勻分布。最后,對(duì)上進(jìn)風(fēng)袋式除塵器內(nèi)部的氣固相兩相流動(dòng)情況進(jìn)行了模擬計(jì)算。通過(guò)分析T=0~5s的固體顆粒運(yùn)動(dòng)狀態(tài),以及T=5s時(shí)不同高度Z截面上的顆粒相濃度,結(jié)果表明:大部分顆粒從進(jìn)氣室進(jìn)入袋室后,沿預(yù)先設(shè)置的緩沖區(qū)域向下運(yùn)動(dòng),繼而向排氣口側(cè)推進(jìn)。上進(jìn)風(fēng)袋式除塵器能夠很好的利用顆粒自重,降低袋式除塵器的壓力損失,但同時(shí)不可避免的造成了靠近進(jìn)氣室一側(cè)的濾袋顆粒負(fù)載較大,而靠近排氣口一側(cè)的濾袋負(fù)載的顆粒較少。模擬結(jié)果可以為上進(jìn)風(fēng)袋式除塵器的設(shè)計(jì)和優(yōu)化提供依據(jù)。
[Abstract]:At present, ultrafine particulate matter is the main factor that endangers human health and pollutes the atmospheric environment. With the more and more strict control of ultrafine particles in our country, as a kind of dedusting equipment with high removal efficiency, bag dust collector will have a wider application prospect. In this paper, the numerical simulation and optimization of the flow field in a large upwind bag dust collector based on FLUENT software package are carried out. The main contents include four parts. First of all, the numerical simulation of the flow field in the upper inlet bag filter shows that the airflow is not evenly distributed in the bag chamber, and the filter bag near the inlet chamber is easy to be damaged. At the same time, the influence of different filter bag diameter on the performance of bag dust collector needs to be further explored. Secondly, the effect of different filter bag number on the flow field in the upper air bag filter is investigated. The distribution coefficient of flow, the uneven amplitude of maximum flow, the flow trace, the velocity distribution and pressure loss on the surface of filter bag were analyzed comprehensively. The results show that when the filter bag number is 76, the airflow distribution is the most uniform, and the load of each filter bag is balanced, and the pressure drop of the bag filter increases with the increase of the filter bag number at the same filtration speed. The order of pressure drop is 9288847672.Compared with 72 filter bags, the available filter area of 76 filter bags is larger. Considering comprehensively, the optimum filter bag number of bag filter is 76. Thirdly, the influence of different filter bag diameters (桅 150 and 桅 130) on the flow field in the upper air bag filter is investigated. The velocity and pressure distribution of the filter bag flow distribution coefficient and the cross section of the bag filter box are analyzed. The results show that, compared with 桅 150 and 桅 130, the airflow distribution of each filter bag in the bag chamber is more balanced, and the velocity and pressure of each cross section are symmetrical and uniform after adopting the same diameter filter bag. Finally, the gas-solid two-phase flow in the upper-inlet bag dust collector is simulated and calculated. By analyzing the motion state of solid particles in TX _ (0) O ~ (5) s and the particle phase concentration in Z section at different heights at T _ (5) s, the results show that most of the particles move downward along the pre-set buffer zone after entering the bag chamber from the inlet chamber. Then push to the side of the vent. The upper air bag filter can make good use of the particle weight and reduce the pressure loss of the bag filter, but at the same time, the filter bag particle load near the side of the inlet chamber is larger. But the filter bag near the side of the vent has less particles. The simulation results can provide the basis for the design and optimization of the upper inlet bag dust collector.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：X701.2

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本文編號(hào)：1925048