本文選題：瀝青拌合設備 + 煤粉燃燒器��； 參考：《長沙理工大學》2015年碩士論文

【摘要】：本論文所研究的煤粉燃燒器是連續(xù)式瀝青拌合設備的關(guān)鍵部件,對降低能耗、成本和提高生產(chǎn)率有著非常重要的意義。因而,開展煤粉燃燒器的設計及研究十分必要。本論文首先簡單闡述了現(xiàn)有煤粉燃燒器的主要研究成果,并針對20t/h的瀝青混合料拌合設備的生產(chǎn)要求研究設計了一款新型高目煤粉渦流霧化燃燒器。確定出新型燃燒器基本結(jié)構(gòu)模型,并對新型高目煤粉渦流霧化燃燒器進行了運行特性、參數(shù)計算和結(jié)構(gòu)設計的研究。新型燃燒器中的渦流霧化器可使煤粉進一步破碎并與空氣混合均勻,煤粉燃燒更加完全,從而提高了燃燒效率且減少了煙氣的排放。接著,本研究對新型高目煤粉渦流燃燒器進行數(shù)值建模、仿真分析和樣機試驗,將燃燒器理論、仿真和試驗較好地結(jié)合在一起。本文介紹了煤粉燃燒器的數(shù)值模擬理論并對新型高目煤粉燃燒器進行了數(shù)值模擬試驗。主要運用Fluent軟件對新型燃燒器內(nèi)部氣流流動狀態(tài)以及煤粉顆粒運動情況作了模擬與分析,其中湍流部分采用(Realizable k-?)可實現(xiàn)模型,煤粉空氣混合流采用氣固兩相流模型。再根據(jù)不同的葉片傾斜角度模擬不同試驗情況,對比分析仿真結(jié)果,選取最佳葉片傾斜角。并通過試驗表明渦流霧化器對煤粉空氣混合流有著積極影響,促進了煤粉空氣混合均勻。由此驗證了新型高目煤粉渦流霧化燃燒器設計的合理性。本研究設計的高目煤粉渦流霧化器能很好的實現(xiàn)了高目煤粉在燃燒場中的渦流化與霧化兩個功能。同時本文對高目煤粉渦流霧化器應用在瀝青混合料拌合設備上進行了現(xiàn)場試驗。通過改變一、二次風速進行的正交試驗驗證了最佳一次風速、二次風速大小。并通過與原有燃燒器進行了對比試驗,驗證新型燃燒器比原有燃燒器的能源消耗量降低了8.2%,煙氣排放濃度降低了10%,很好的實現(xiàn)了能源節(jié)約與環(huán)境保護的兼顧。通過數(shù)值模擬及現(xiàn)場試驗驗證了新型高目煤粉渦流霧化燃燒器在實際應用中能夠?qū)崿F(xiàn)良好的性能和作用。
[Abstract]:The pulverized coal burner studied in this paper is the key component of continuous asphalt mixing equipment, which is of great significance to reduce energy consumption, cost and increase productivity. Therefore, it is necessary to develop the design and research of pulverized coal burner. In this paper, the main research results of the existing pulverized coal burners are briefly described, and a new type of swirl atomization burner with high quality pulverized coal is designed according to the production requirements of 20t/h asphalt mixture mixing equipment. The basic structure model of the new type burner is established, and the operation characteristics, parameter calculation and structure design of the new type swirl atomization burner with high quality pulverized coal are studied. The swirl atomizer in the new burner can further break the pulverized coal and mix it evenly with the air, and the pulverized coal can be burned more completely, thus increasing the combustion efficiency and reducing the flue gas emission. Then, the numerical modeling, simulation analysis and prototype test of a new type of pulverized coal swirl burner are carried out. The theory, simulation and test of the burner are combined well. In this paper, the numerical simulation theory of pulverized coal burner is introduced and the numerical simulation test of a new type of pulverized coal burner is carried out. Fluent software is used to simulate and analyze the flow state in the new burner and the movement of pulverized coal particles. The gas-solid two-phase flow model is adopted in the mixture flow of pulverized coal and air. Then according to the different blade tilt angle to simulate the different experimental situation, compare and analyze the simulation results, select the best blade tilt angle. The experimental results show that the swirl atomizer has a positive effect on the mixing flow of pulverized coal air and promotes the mixing uniformity of pulverized coal air. The rationality of the design of a new type of swirl atomization burner for pulverized coal is verified. The swirl atomizer designed in this paper can achieve the two functions of swirl and atomization in the combustion field. At the same time, the field test was carried out on the asphalt mixture mixing equipment with the application of Gaomu pulverized coal swirl nebulizer. The optimal primary wind speed and the secondary wind speed are verified by orthogonal test of changing the first and second wind speeds. By comparing with the original burner, it is proved that the energy consumption of the new type burner is 8.2 lower than that of the original burner, and the smoke emission concentration is reduced by 10%. The energy saving and environmental protection are well realized. Through numerical simulation and field test, it is proved that the new type of swirl atomizing burner with high quality pulverized coal can achieve good performance and function in practical application.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U415.522

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