本文選題：回轉(zhuǎn)窯 + 窯體結(jié)圈��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：近幾年,鋼鐵行業(yè)處于微利或虧損經(jīng)營狀況,不少企業(yè)面臨生死存亡考驗,唯一求得生存的途徑就是通過技術(shù)創(chuàng)新降低成本,而提高自產(chǎn)鐵礦石利用率是有效降低成本一條途徑。目前,國內(nèi)數(shù)十億噸難選鐵礦石,受磁化焙燒工藝裝備限制,不能有效利用,迫切需要開發(fā)出適合國內(nèi)難選鐵礦石磁化焙燒處理的回轉(zhuǎn)窯裝置。本課題主要以回轉(zhuǎn)窯磁化焙燒裝置為研究對象,對窯體結(jié)圈的機(jī)理進(jìn)行研究分析,研究通過改變窯體結(jié)構(gòu)抑制結(jié)圈的可行性,根據(jù)煙氣流動過程中質(zhì)量守恒原理和物料入窯預(yù)熱、干燥、加熱、還原所需時間及窯體長度,確定回轉(zhuǎn)窯窯體結(jié)構(gòu)設(shè)計的半徑比和長徑比,對實驗室難選鐵礦磁化焙燒回轉(zhuǎn)窯窯體結(jié)構(gòu)參數(shù)進(jìn)行優(yōu)化設(shè)計;開展變徑回轉(zhuǎn)窯和通徑回轉(zhuǎn)窯磁化焙燒處理酒鋼0~15mm鐵礦石分級后的1~5mm粒級粉礦窯體結(jié)圈對比驗證試驗,驗證窯體變徑優(yōu)化設(shè)計對處理難選鐵礦石抑制結(jié)圈的效果,根據(jù)試驗結(jié)果,對已投用產(chǎn)業(yè)化生產(chǎn)的回轉(zhuǎn)窯窯體結(jié)構(gòu)進(jìn)行設(shè)計。首先,對回轉(zhuǎn)窯磁化焙燒難選鐵礦石結(jié)圈機(jī)理進(jìn)行分析研究,主要對窯體結(jié)圈的位置、窯體固相和液相結(jié)圈的機(jī)理及窯體結(jié)圈的影響因素進(jìn)行分析,提出細(xì)粒級低熔點物質(zhì)入窯和回轉(zhuǎn)窯窯內(nèi)局部高溫是造成窯內(nèi)結(jié)圈主要原因的觀點。防止細(xì)粒級物料入窯可采用粒度分級的方法解決,而窯體內(nèi)局部高溫需通過窯體結(jié)構(gòu)優(yōu)化設(shè)計來解決,根據(jù)煙氣流動過程中質(zhì)量守恒原理和物料入窯預(yù)熱、干燥、加熱、還原所需時間及窯體長度,確定回轉(zhuǎn)窯窯體結(jié)構(gòu)設(shè)計的半徑比為(?)倍和長徑比為13~17倍以及回轉(zhuǎn)窯窯體傳動裝置的參數(shù)設(shè)計。對實驗室φ0.45×6m燃?xì)馔◤交剞D(zhuǎn)窯進(jìn)行窯體結(jié)構(gòu)變徑優(yōu)化設(shè)計。其次,采用φ0.65~0.45×9m燃?xì)庾儚交剞D(zhuǎn)窯和φ0.45×6m燃?xì)馔◤交剞D(zhuǎn)窯,對酒鋼鏡鐵礦1~5mm粒級粉礦進(jìn)行磁化焙燒窯體結(jié)圈驗證試驗。驗證試驗結(jié)果顯示,在磁化焙燒溫度等其它參數(shù)相同條件下,變徑回轉(zhuǎn)窯較通徑回轉(zhuǎn)窯產(chǎn)能提高了50%、能耗降低20%左右,且具有明顯抑制結(jié)圈功能,并對三種已投入產(chǎn)業(yè)化生產(chǎn)的回轉(zhuǎn)窯進(jìn)行窯體結(jié)構(gòu)設(shè)計,確定了回轉(zhuǎn)窯技術(shù)參數(shù)和運行參數(shù)。該項目完成后,能夠有效解決回轉(zhuǎn)窯受窯體結(jié)圈制約,不能廣泛應(yīng)用于難選鐵礦石磁化焙燒領(lǐng)域的問題,為國內(nèi)數(shù)十億噸難選鐵礦石有效利用提供高產(chǎn)能、低能耗的磁化焙燒裝備,市場前景廣闊。
[Abstract]:In recent years, the iron and steel industry has been in a state of little profit or loss, and many enterprises are facing the test of survival and death. The only way to survive is to reduce costs through technological innovation. Raising the utilization rate of self-produced iron ore is an effective way to reduce cost. At present, billions of tons of refractory iron ore in China are limited by magnetization roasting technology and equipment, so it is urgent to develop a rotary kiln which is suitable for magnetization roasting treatment of refractory iron ore in China. This topic mainly takes the rotary kiln magnetization roasting device as the research object, carries on the research analysis to the kiln body junction ring mechanism, studies through changing the kiln body structure to suppress the junction ring feasibility, According to the principle of mass conservation in the process of flue gas flow, the time required to preheat, drying, heating and reducing materials into kiln and the length of kiln body, the radius ratio and aspect ratio of structure design of rotary kiln are determined. The structure parameters of magnetized roasting rotary kiln with refractory iron ore in laboratory were optimized, and the comparative verification test of 1~5mm granular-grade powder kiln after magnetized roasting treatment of 0~15mm iron ore in Jiugang was carried out in variable diameter rotary kiln and through diameter rotary kiln. It is verified that the optimum design of kiln body diameter is effective in treating refractory iron ore. According to the test results, the structure of rotary kiln which has been put into industrial production has been designed. Firstly, the mechanism of refractory iron ore ring formation in rotary kiln magnetization roasting is analyzed. The position of kiln body ring, the mechanism of kiln solid and liquid phase ring formation and the influence factors of kiln body ring formation are analyzed. It is pointed out that the local high temperature in the kiln with fine grain and low melting point is the main reason for the formation of the ring in the kiln. The method of granularity classification can be used to prevent fine grained material from entering into kiln, and the local high temperature of kiln needs to be solved by optimizing design of kiln structure. According to the principle of conservation of mass in flue gas flow and the preheating, drying and heating of material into kiln, The reduction time and kiln length are determined to determine the radius ratio of the structure design of rotary kiln. The ratio of length to diameter is 1317 times and the parameter design of rotary kiln. The optimization design of the kiln structure for the rotary kiln with gas diameter of 0.45 脳 6 m in laboratory is carried out. Secondly, using 蠁 0.65 ~ 0.45 脳 9 m gas variable diameter rotary kiln and 蠁 0.45 脳 6 m gas path rotary kiln, the magnetization roasting kiln of 1~5mm granulated powder ore in Jiugang was tested. The experimental results show that under the same conditions of magnetization calcination temperature and other parameters, the productivity of variable diameter rotary kiln is increased by 50%, the energy consumption is reduced by about 20%, and the loop forming function is obviously inhibited. The structure of three rotary kilns which have been put into industrial production has been designed and the technical parameters and operation parameters of rotary kilns have been determined. After the completion of the project, it can effectively solve the problem that the rotary kiln is restricted by the kiln body and can not be widely used in the field of magnetization roasting of refractory iron ore, and can provide high production capacity for the effective utilization of billions of tons of refractory iron ore in China. The low energy consumption magnetization roasting equipment has a broad market prospect.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD951

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