本文選題：瀝青拌合設(shè)備 + 煤粉燃燒器��； 參考：《長(zhǎng)沙理工大學(xué)》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(shè)備的關(guān)鍵部件,對(duì)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(shè)計(jì)及研究十分必要。本論文首先簡(jiǎn)單闡述了現(xiàn)有煤粉燃燒器的主要研究成果,并針對(duì)20t/h的瀝青混合料拌合設(shè)備的生產(chǎn)要求研究設(shè)計(jì)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(duì)新型高目煤粉渦流霧化燃燒器進(jìn)行了運(yùn)行特性、參數(shù)計(jì)算和結(jié)構(gòu)設(shè)計(jì)的研究。新型燃燒器中的渦流霧化器可使煤粉進(jìn)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(duì)新型高目煤粉渦流燃燒器進(jìn)行數(shù)值建模、仿真分析和樣機(jī)試驗(yàn),將燃燒器理論、仿真和試驗(yàn)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(duì)新型高目煤粉燃燒器進(jìn)行了數(shù)值模擬試驗(yàn)。主要運(yùn)用Fluent軟件對(duì)新型燃燒器內(nèi)部氣流流動(dòng)狀態(tài)以及煤粉顆粒運(yùn)動(dòng)情況作了模擬與分析,其中湍流部分采用(Realizable k-?)可實(shí)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(yàn)情況,對(duì)比分析仿真結(jié)果,選取最佳葉片傾斜角。并通過試驗(yàn)表明渦流霧化器對(duì)煤粉空氣混合流有著積極影響,促進(jìn)了煤粉空氣混合均勻。由此驗(yàn)證了新型高目煤粉渦流霧化燃燒器設(shè)計(jì)的合理性。本研究設(shè)計(jì)的高目煤粉渦流霧化器能很好的實(shí)現(xiàn)了高目煤粉在燃燒場(chǎng)中的渦流化與霧化兩個(gè)功能。同時(shí)本文對(duì)高目煤粉渦流霧化器應(yīng)用在瀝青混合料拌合設(shè)備上進(jìn)行了現(xiàn)場(chǎng)試驗(yàn)。通過改變一、二次風(fēng)速進(jìn)行的正交試驗(yàn)驗(yàn)證了最佳一次風(fēng)速、二次風(fēng)速大小。并通過與原有燃燒器進(jìn)行了對(duì)比試驗(yàn),驗(yàn)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(shí)現(xiàn)了能源節(jié)約與環(huán)境保護(hù)的兼顧。通過數(shù)值模擬及現(xiàn)場(chǎng)試驗(yàn)驗(yàn)證了新型高目煤粉渦流霧化燃燒器在實(shí)際應(yīng)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(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U415.522

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