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污染較重的城市主要分布在華北、西北、東北、中原以及四川東部、重慶市等地區(qū)。其中,有部分城市還存在較為嚴(yán)重的二氧化硫污染問題。南方地區(qū)則存在酸雨污染問題,且分布地域較為廣泛。在該畢業(yè)設(shè)計(jì)中,微粉干燥機(jī)對(duì)于需要獲得200300目以上超細(xì)粉體的產(chǎn)品,則可以免除粉碎、分篩二道工序,大大降低工藝設(shè)備總投入和相關(guān)運(yùn)行費(fèi)用,為用戶降低生產(chǎn)成本提高產(chǎn)品競(jìng)爭(zhēng)力,提供了設(shè)備保障。本裝置的平均熱能效率達(dá)到6080%,在氣流干燥設(shè)備中,熱效率、熱容量系數(shù)、成品品質(zhì)均優(yōu)于其它類型的干燥裝置。通過保溫層結(jié)構(gòu)提高熱風(fēng)的干燥效率,出風(fēng)口采用了旋轉(zhuǎn)分離機(jī)和布袋分離機(jī),%以上,既達(dá)到了環(huán)保的效果,又提高了經(jīng)濟(jì)效益,實(shí)現(xiàn)了環(huán)保和經(jīng)濟(jì)的雙贏。東北大學(xué)畢業(yè)設(shè)計(jì)(論文) 第4章結(jié)論 第4章 結(jié)論畢業(yè)設(shè)計(jì)是本科學(xué)習(xí)階段一次非常難得的理論與實(shí)際相結(jié)合的機(jī)會(huì),通過這次比較完整的GSZP85微粉干燥機(jī)高速粉碎部分的結(jié)構(gòu)設(shè)計(jì),我擺脫了單純的理論知識(shí)學(xué)習(xí)狀態(tài),和實(shí)際設(shè)計(jì)的結(jié)合鍛煉了我的綜合運(yùn)用所學(xué)的專業(yè)基礎(chǔ)知識(shí),解決實(shí)際工程問題的能力,同時(shí)也提高我查閱文獻(xiàn)資料,設(shè)計(jì)手冊(cè),設(shè)計(jì)規(guī)范以及電腦制圖等其他專業(yè)能力水平,而且通過對(duì)整體的掌控,對(duì)拒不的取舍,以及對(duì)細(xì)節(jié)的斟酌處理,都使我的能力得到了鍛煉,經(jīng)驗(yàn)得到了豐富,并且意志品質(zhì)力,抗壓能力及耐力也都得到了不同程度的提升。這是我們都希望看到的也是我們進(jìn)行畢業(yè)設(shè)計(jì)的目的所在。雖然畢業(yè)設(shè)計(jì)內(nèi)容繁多,過程繁瑣但我的收獲卻更加豐富。各種系統(tǒng)的使用條件,各種設(shè)備的選用標(biāo)準(zhǔn),我都是隨著設(shè)計(jì)的不斷深入而不斷熟悉并學(xué)會(huì)應(yīng)用的。和老師的溝通交流更使我從經(jīng)濟(jì)的角度對(duì)設(shè)計(jì)有了新的認(rèn)識(shí)也對(duì)自己提出了新的要求。提高是有限的但提高也是全面的,正是這一次設(shè)計(jì)讓我積累了無數(shù)實(shí)際經(jīng)驗(yàn),使我的頭腦更好的被知識(shí)武裝了起來,也必然會(huì)讓我在未來的工作學(xué)習(xí)中表現(xiàn)出更高的應(yīng)變能力,更強(qiáng)的溝通力和理解力。順利如期的完成本次畢業(yè)設(shè)計(jì)給了我很大的信心,讓我了解專業(yè)知識(shí)的同時(shí)也對(duì)本專業(yè)的發(fā)展前景充滿信心。東北大學(xué)畢業(yè)設(shè)計(jì)(論文) 參考文獻(xiàn) 參考文獻(xiàn)[M],化學(xué)工業(yè)出版社,19872 .[M],化學(xué)工業(yè)出版社 ,2002[M],機(jī)械工業(yè)出版社,2004.[M],化學(xué)工業(yè)出版社,2003,于才淵,[M] , 化學(xué)工業(yè)出版社,2005,田振山,劉廣義. 干燥技術(shù)及其工業(yè)應(yīng)用[M],, 中國(guó)石化出版社,2004[M], 上海:1976. 干燥設(shè)備[M] , 化學(xué)工業(yè)出版社工業(yè)裝備與信息工程出版中心, 2002,王世番. 干燥原理及其應(yīng)用[M], 上海:上??茖W(xué)技術(shù)文獻(xiàn)出版社, 1986,王寶,王喜忠. 干燥裝置設(shè)計(jì)手冊(cè)[M], 化學(xué)工業(yè)出版社, 2005,秦霽光. 干燥裝置手冊(cè)[M], 上海:上海科學(xué)技術(shù)出版社, 1983,達(dá)張慜,[M], 中國(guó)輕工業(yè)出版社, 2007[J],沈陽: 有色礦冶 2005年z1期[J],第十屆全國(guó)干燥會(huì)議論文15 .現(xiàn)代干燥技術(shù)[M], 2007,[J],2001,[M],化學(xué)工業(yè)出版社, 2002[M],中國(guó)石化出版社 , 2004,蕭成基. 近三十年來我國(guó)干燥技術(shù)的發(fā)展概況[J][J],杭州:2003[M], 國(guó)防工業(yè)出版社, 2000東北大學(xué)畢業(yè)設(shè)計(jì)(論文) 結(jié)束語結(jié)束語經(jīng)過3個(gè)月的努力工作,在我的指導(dǎo)老師,劉陽老師的指導(dǎo)幫助下,畢業(yè)設(shè)計(jì)終于宣告完成。通過參與這次設(shè)計(jì),我將大學(xué)四年所學(xué)到的專業(yè)知識(shí)和實(shí)際項(xiàng)目結(jié)合,針對(duì)實(shí)際生產(chǎn)中出現(xiàn)的實(shí)際問題進(jìn)行了實(shí)際應(yīng)用設(shè)備的部分結(jié)構(gòu)設(shè)計(jì)。從中獲取的經(jīng)驗(yàn),將對(duì)我以后的學(xué)習(xí)和工作生活起到極大的指導(dǎo)和豐富作用。 通過初期的調(diào)研,總體設(shè)計(jì),我體會(huì)到了如何參與和怎樣開始參與到系統(tǒng)化工作中。進(jìn)行二維繪圖,大大增強(qiáng)了我的計(jì)算機(jī)制圖能力。和伙伴們對(duì)項(xiàng)目進(jìn)行探討和研究,讓我體會(huì)到了團(tuán)隊(duì)活動(dòng)的樂趣。在填寫計(jì)算說明和報(bào)告書時(shí),我再次受到了嚴(yán)謹(jǐn)求實(shí)的學(xué)風(fēng)和身為未來工程師必備的專業(yè)素質(zhì)的熏陶,并對(duì)本行業(yè)對(duì)社會(huì)的貢獻(xiàn)和行業(yè)的未來充滿了信心。在此,我再次感謝劉陽老師,是您指導(dǎo),陪伴我順利完成在東北大學(xué)的最后一項(xiàng)學(xué)業(yè)。我還要感謝我的室友和學(xué)友們,在未來的一段時(shí)間里我將很難再找到那樣無私的友情和幫助。最后感謝所有在我四年的大學(xué)生涯中給予我支持,幫助,指導(dǎo)和鼓勵(lì)的友人,這些相遇相知都已成為我生命中的寶貴財(cái)富,本人永難忘懷。東北大學(xué)畢業(yè)設(shè)計(jì)(論文) 附錄附錄:外文資料翻譯翻譯原文:A P V D R Y E R H A N D B O O KSection 2EFFICINET ENERGY UTILIZAION IN DRYINGIt is generally necessary to employ thermal methods in order to achieve a product that is termed mercially dry. Thermal dryers, therefore, are an important unit operation in many industries. Products such as pigments , baby formula, kaolin and instant coffee usually have to be processed in dryers to obtain the final product.The mercial drying process can take place in a number of different types of dryers as described in the previous section. However, the thermodynamics of drying is the same regardless of the actual device. Water or another liquid such as a solvent has to be evaporated from a solid by the application of heat. Generally, the drying takes place in an air atmosphere, although some specialized dryers may use nitrogen or even superheated steam as the atmosphere.The most important parameter that governs the pretreatment and the dryer design is the “cost per unit weight of dried product.”While drying is an extremely energy intensive operation, there are techniques that can be used to minimize the energy costs per unit output of product, including:n Minimizing the water content of the feed prior to feeding to the dryer.n Maximizing the temperature drop of the drying gas. This implies maximum inlet and minimum outlet temperature.n Employing the maximum possible recirculation of the drying gas.n Considering the possibility of two stage counter flow drying.n Utilizing the heat in the discharge air to preheat ining air.Utilizing direct heat wherever possible.Reducing radiation and convection heat loss by means of efficient thermal insulation.The most important of the above is to minimize the water content of the feed by pretreatment with other techniques. Mechanical separation processes such as settling, centrifuging, filtration, reverse osmosis, etc., are far more energy efficient than thermal processes. When mechanical separation is not possible,evaporation should be considered. Although evaporation is a thermal process, the thermal efficiency of water removal is many times that of a dryer. In a large system,it is possible to evaporate 7 or 8 mass units of water for 1 mass unit of steam supply. Mechanical repression evaporation can be even more energy typical dryer does not even evaporate 1 mass unit per 1 mass unit of steam.MINIMIZE WATER CONTENT OF THE FEEDAn example of this technique would be the case of a kaolin dryer with a duty to produce 50,000 lb/h (12,727kg/h) of solids with 1% moisture from a feed of99,000 lb/h (45,454kg/h) of material a