【摘要】：近年來(lái),中國(guó)受工業(yè)經(jīng)濟(jì)迅猛發(fā)展和中產(chǎn)階級(jí)膨脹推動(dòng)的作用,能源消耗費(fèi)已經(jīng)占到了全球能源消費(fèi)總量的21%,成為最大的能源消費(fèi)國(guó),但人均能源消耗和單位GDP的能源消耗都處在較低水平,說(shuō)明中國(guó)的能源利用效率有待提高。冷卻裝置是高效的節(jié)能裝置,但現(xiàn)有的冷卻裝置不能很好的應(yīng)對(duì)鐵礦石的絕氧冷卻要求。首先,對(duì)滾筒冷卻裝置的各個(gè)主要部件進(jìn)行需求分析,并融入鐵礦石粉料的特點(diǎn),分析所需相應(yīng)的結(jié)構(gòu)形式,并對(duì)比了各動(dòng)密封形式的優(yōu)劣后選取波紋管動(dòng)密封結(jié)構(gòu)將其應(yīng)用到進(jìn)料口結(jié)構(gòu)上。通過(guò)對(duì)冷卻裝置傳熱過(guò)程的計(jì)算,求出冷卻過(guò)程的物料和冷卻水溫度變化和熱交換量隨時(shí)間的變化曲線(xiàn),提出在冷卻鐵礦石這類(lèi)需要迅速降溫的物料時(shí),應(yīng)選擇使用冷卻水與物料流向相反方式的冷卻裝置進(jìn)行冷卻處理。其次,對(duì)滾筒中的高溫物料顆粒進(jìn)行運(yùn)動(dòng)受力分析,并簡(jiǎn)化其運(yùn)動(dòng)過(guò)程,推導(dǎo)出停留時(shí)間與其他裝置參數(shù)的關(guān)系式,并以此確定裝置對(duì)物料停留時(shí)間的影響參數(shù),進(jìn)而通過(guò)模型求出參數(shù)對(duì)停留時(shí)間的實(shí)際影響效果,并分析其產(chǎn)生原因,提出部分參數(shù)選擇的建議和約束。最后,分析了鐵礦石粉料在冷卻裝置中的換熱過(guò)程,并運(yùn)用傅立葉定律、斯忒藩—波耳曼定律和牛頓冷卻定律中體現(xiàn)的換熱關(guān)系建立數(shù)值模型,迭代求出冷卻裝置的出力及出料溫度受裝置參數(shù)的影響曲線(xiàn),分析總結(jié)其產(chǎn)生原因,為后續(xù)針對(duì)鐵礦石粉料的冷卻裝置結(jié)構(gòu)的優(yōu)化提供依據(jù)。通過(guò)梳理上述的分析結(jié)果,總結(jié)出針對(duì)鐵礦石粉料冷卻裝置的優(yōu)化方案,并拓展至一般的應(yīng)用場(chǎng)景。
[Abstract]:In recent years, driven by the rapid development of industrial economy and the expansion of the middle class, China has accounted for 21% of the total global energy consumption, becoming the largest energy consumer. However, the per capita energy consumption and the energy consumption per unit of GDP are at a relatively low level, indicating that China's energy efficiency needs to be improved. The cooling device is an efficient energy-saving device, but the existing cooling device can not meet the absolute oxygen cooling requirements of iron ore. First of all, the demand analysis of the main components of the drum cooling device is carried out, and the characteristics of iron ore powder are integrated, and the corresponding structural forms are analyzed. After comparing the advantages and disadvantages of each dynamic seal form, the bellows dynamic seal structure is selected to apply it to the feed port structure. Through the calculation of the heat transfer process of the cooling device, the curves of the temperature change of the cooling process and the cooling water temperature and the heat exchange capacity with time are obtained, and it is proposed that when cooling the iron ore, this kind of material needs to be cooled rapidly. Cooling devices with opposite cooling water and material flow should be selected for cooling treatment. Secondly, the moving force of high temperature material particles in the drum is analyzed, and the motion process is simplified, the relationship between residence time and other device parameters is deduced, and the influence parameters of the device on the residence time of the material are determined. Furthermore, the actual effect of parameters on residence time is obtained through the model, and the causes are analyzed, and some suggestions and constraints for parameter selection are put forward. Finally, the heat transfer process of iron ore powder in the cooling device is analyzed, and the numerical model is established by using the heat transfer relationship embodied in Fourier law, Stefan-Bolman's law and Newton's cooling law. The influence curve of the output force and the discharge temperature of the cooling device by the parameters of the device is obtained iteratively, and the causes are analyzed and summarized, which provides the basis for the subsequent optimization of the structure of the cooling device for iron ore powder. By combing the above analysis results, the optimization scheme of iron ore powder cooling device is summarized and extended to the general application scenario.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD45

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