本文選題：袋式除塵器 + 含塵氣體流動(dòng)�。� 參考：《東華大學(xué)》2013年博士論文

【摘要】：環(huán)保要求的提高和大氣污染問(wèn)題的日益突顯,提高了對(duì)除塵技術(shù)的要求。大量燃煤機(jī)組靜電除塵器面臨即將改造為袋式除塵器,而改造項(xiàng)目中風(fēng)機(jī)特性和系統(tǒng)可靠性對(duì)袋式除塵器的能耗提出了較高的要求。同時(shí)實(shí)際工程中存在部分袋式除塵器的運(yùn)行能耗高或?yàn)V袋使用壽命短的問(wèn)題,進(jìn)而制約了袋式除塵器的迅速推廣。袋式除塵器的除塵機(jī)理為濾料對(duì)顆粒物的過(guò)濾捕集,濾料作為核心構(gòu)件對(duì)除塵器的影響體現(xiàn)在過(guò)濾阻力和失效性?xún)蓚�(gè)方面。過(guò)濾阻力相關(guān)研究集中在濾料捕集顆粒物后的阻力特性變化,而對(duì)運(yùn)行能耗高的解釋仍需完善,形成的機(jī)理仍需更加深入的分析。本課題以袋式除塵器內(nèi)“氣流流動(dòng)—顆粒物運(yùn)動(dòng)—能耗”三者間的相互作用為研究對(duì)象,從含塵氣體流動(dòng)的角度分析了高能耗形成的原因,建立了相應(yīng)評(píng)價(jià)方法并用于對(duì)結(jié)構(gòu)設(shè)計(jì)和工程案例的應(yīng)用。主要的研究工作如下： (1)建立了袋式除塵器能耗基本模型,分析了高能耗形成原因。通過(guò)對(duì)含塵氣體流動(dòng)過(guò)程中顆粒物運(yùn)動(dòng)的分析表明,袋式除塵器中過(guò)濾濃度升高是含塵氣體流動(dòng)影響能耗的主要方式,是高能耗形成的主要原因。 (2)建立了袋式除塵器氣體流動(dòng)的數(shù)值計(jì)算模型。通過(guò)對(duì)袋式除塵器內(nèi)氣流流動(dòng)狀態(tài)的分析,得到其內(nèi)部同時(shí)存在三種狀態(tài)氣流流動(dòng)區(qū)域,并以此為依據(jù)對(duì)比分析了試驗(yàn)測(cè)試結(jié)果與模擬計(jì)算結(jié)果,確定了模擬方法的合理邊界層設(shè)置、簡(jiǎn)化方式及計(jì)算模型選擇等,使模擬方法滿足工程應(yīng)用的要求。 (3)分析了氣流組織對(duì)袋式除塵器能耗的影響,建立了相應(yīng)的評(píng)價(jià)方法。通過(guò)對(duì)袋式除塵器結(jié)構(gòu)運(yùn)行參數(shù)的因子分析及交互作用分析,確定了袋式除塵器直接能耗的評(píng)價(jià)指標(biāo)為除塵器計(jì)算阻力、返混流量比和濾料結(jié)構(gòu)特性,間接能耗的評(píng)價(jià)指標(biāo)為濾袋沖刷和濾料處理負(fù)荷。 (4)分析了濾料對(duì)袋式除塵器能耗影響,建立了相應(yīng)的評(píng)價(jià)方法。通過(guò)對(duì)12種濾料過(guò)濾阻力試驗(yàn)結(jié)果的擬合分析,從能耗角度建立了濾料選擇的評(píng)價(jià)方法,并簡(jiǎn)單分析了濾料結(jié)構(gòu)特性對(duì)能耗的影響。 (5)應(yīng)用評(píng)價(jià)方法分析了設(shè)備結(jié)構(gòu)參數(shù)對(duì)能耗的影響。通過(guò)對(duì)袋式除塵器結(jié)構(gòu)參數(shù)的因子分析,得到了影響袋式除塵器能耗的顯著性因子及其影響規(guī)律。 (6)應(yīng)用評(píng)價(jià)方法實(shí)現(xiàn)了對(duì)工程改造項(xiàng)目方案預(yù)測(cè)分析。通過(guò)工程改造項(xiàng)目4種方案的評(píng)價(jià)指標(biāo)對(duì)比,得到了各設(shè)計(jì)方案中存在的問(wèn)題及相互間的差異,該結(jié)果符合工程改造后的運(yùn)行狀況。
[Abstract]:The improvement of environmental protection requirements and the increasing problem of air pollution have raised the requirements of dust removal technology.The electrostatic precipitator of a large number of coal-fired units is about to be transformed into a bag dust collector, and the fan characteristics and system reliability in the retrofit project require higher energy consumption of the bag dust collector.At the same time, there are some problems in practical engineering, such as high energy consumption in operation or short service life of filter bag, which restricts the rapid popularization of bag filter.The dust removal mechanism of bag filter is the filtration and capture of particulate matter by filter media, and the influence of filter material as core component on dust collector is reflected in two aspects: filtration resistance and failure.The study of filtration resistance is focused on the change of resistance characteristics after the filter media capture particulate matter, but the explanation of high operating energy consumption still needs to be improved, and the mechanism of formation still needs to be further analyzed.In this paper, the interaction between "airflow, particle motion and energy consumption" in a bag filter is studied. The reasons for the formation of high energy consumption are analyzed from the point of view of the flow of dust-containing gas.The corresponding evaluation methods are established and applied to structural design and engineering cases.The main research work is as follows:1) the basic model of energy consumption of bag dust collector is established, and the reason of high energy consumption is analyzed.Through the analysis of particle movement during the flow of dust-containing gas, it is shown that the increase of filter concentration in bag dust collector is the main way to influence the energy consumption of dust-containing gas flow, and the main reason for the formation of high energy consumption.2) the numerical model of gas flow in bag dust collector is established.Through the analysis of the air flow state in the bag dust collector, it is found that there are three kinds of air flow regions in the bag dust collector at the same time. Based on this, the test results and the simulation results are compared and analyzed.The reasonable boundary layer setting, simplified method and calculation model selection of the simulation method are determined, so that the simulation method can meet the requirements of engineering application.The influence of airflow organization on energy consumption of bag dust collector is analyzed, and the corresponding evaluation method is established.Based on the factor analysis and interaction analysis of the structure operation parameters of the bag dust collector, the evaluation indexes of the direct energy consumption of the bag filter are determined as the calculation resistance of the bag filter, the ratio of back mixing flow and the structure characteristics of the filter material.Indirect energy consumption is evaluated by filter bag scouring and filter material treatment load.The influence of filter media on energy consumption of bag filter is analyzed and the corresponding evaluation method is established.Through fitting and analyzing the results of filtration resistance test of 12 kinds of filter media, the evaluation method of filter media selection is established from the point of view of energy consumption, and the influence of filter media structure on energy consumption is simply analyzed.5) the influence of equipment structure parameters on energy consumption is analyzed by using evaluation method.Based on the factor analysis of structural parameters of bag dust collector, the significant factor and its influence law of energy consumption of bag dust collector are obtained.6) applying the evaluation method to forecast and analyze the project plan of engineering transformation project.Through the comparison of the evaluation indexes of the four schemes of the engineering transformation project, the problems existing in each design scheme and their differences are obtained. The results accord with the operation condition of the project after the transformation.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU834.64;X701.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 柳靜獻(xiàn);毛寧;常德強(qiáng);孫熙;;高密面層結(jié)構(gòu)對(duì)針刺氈濾料性能影響的實(shí)驗(yàn)研究[J];東北大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年01期

2 胡滿銀;郁金星;孫喜娟;楊勇;;外濾式袋式除塵器濾袋內(nèi)流場(chǎng)的數(shù)值模擬[J];電力科學(xué)與工程;2007年01期

3 付海明,沈恒根;非穩(wěn)定過(guò)濾捕集效率的理論計(jì)算研究[J];中國(guó)粉體技術(shù);2003年06期

4 付海明;;纖維過(guò)濾介質(zhì)非穩(wěn)態(tài)過(guò)濾壓力損失的研究[J];紡織學(xué)報(bào);2009年04期

5 龍正偉;姚強(qiáng);黃斌;宋薔;;中和顆�？蓧嚎s性顆粒層模型[J];工程熱物理學(xué)報(bào);2007年04期

6 付海明,沈恒根;空氣過(guò)濾理論研究與發(fā)展[J];過(guò)濾與分離;2003年03期

7 付海明;亢燕銘;;粉塵沉積形成濾餅結(jié)構(gòu)的分形研究[J];過(guò)濾與分離;2008年02期

8 向曉東,朱東升,彭偉功;非穩(wěn)態(tài)過(guò)濾除塵壓力損失的研究[J];工業(yè)安全與環(huán)保;2002年09期

9 汪家瓊;劉根凡;;過(guò)濾粉塵層凈化氟化氫的優(yōu)化分析[J];化工機(jī)械;2009年05期

10 向曉東,劉君俠,彭偉功;纖維層表面非穩(wěn)態(tài)過(guò)濾研究[J];環(huán)境工程;2002年06期

相關(guān)博士學(xué)位論文 前1條

1 汪家瓊;氧化鋁在布袋上沉積和吸附HF規(guī)律研究[D];華中科技大學(xué);2009年

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