本文選題：回轉(zhuǎn)窯　切入點：NOx　出處：《西南科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：水泥窯煤粉燃燒器是水泥熟料煅燒的重要設備,其性能的優(yōu)劣以及操作參數(shù)的改變都會對熟料的產(chǎn)量、質(zhì)量以及燒成熱耗產(chǎn)生影響。富氧燃燒技術(shù)的出現(xiàn)為水泥回轉(zhuǎn)窯節(jié)能降耗提供了助力,富氧燃燒技術(shù)不僅能提高熟料煅燒溫度、提高熟料產(chǎn)量及質(zhì)量,還能夠節(jié)約燃料,減少有害氣體(主要為NOx)的排放,減少大氣污染。富氧燃燒作為一種新的燃燒技術(shù)應用在水泥回轉(zhuǎn)窯雖已有少量研究,但將富氧燃燒技術(shù)與水泥窯用煤粉燃燒器相結(jié)合的研究還未見諸報道。本論文在國內(nèi)外燃燒器及富氧燃燒技術(shù)研究現(xiàn)狀的基礎(chǔ)上,進行歸納、總結(jié)、創(chuàng)新,設計出一種將富氧燃燒技術(shù)應用于一次風中的富氧低NOx燃燒器。借助仿真軟件Fluent對設計工況下的流場進行了數(shù)值模擬研究,詳細分析了窯內(nèi)的速度場、溫度場及NOx的濃度分布,數(shù)值計算結(jié)果比較準確的反應了回轉(zhuǎn)窯內(nèi)部流場的分布規(guī)律。同時,重點研究了提高一次風中氧氣濃度對回轉(zhuǎn)窯內(nèi)溫度場及NOx濃度分布的影響,得出當氧氣濃度27%左右時節(jié)能降NOx效果較為顯著。隨后,數(shù)值模擬主要研究了調(diào)整燃燒器操作參數(shù)對回轉(zhuǎn)窯內(nèi)速度場、溫度場及NOx濃度分布的影響。為了驗證模擬結(jié)果與實際工況的一致性,運用模擬計算結(jié)論對國內(nèi)某1000T/D水泥回轉(zhuǎn)窯所用三通道燃燒器進行改造的同時購置安裝了膜法制氧設備。設備運行后一次風中氧氣濃度達到26.8%,并分別對通入富氧前后的燒成系統(tǒng)進行了熱工檢測,通過標定數(shù)據(jù)的對比分析得出,通入富氧后至少提高了火焰溫度120℃、熟料產(chǎn)量提高15%、熟料燒成熱耗降低9.53%,并實現(xiàn)了NOx的減排。本文對所設計富氧低NOx燃燒器的數(shù)值模擬研究及生產(chǎn)實驗,為水泥行業(yè)運用富氧燃燒技術(shù)實現(xiàn)節(jié)能降耗、減排NOx提供了指導,同時也為推進整個水泥行業(yè)技術(shù)進步提供了參考。
[Abstract]:Cement kiln pulverized coal burner is an important equipment for cement clinker calcination. The quality of its performance and the change of operating parameters will affect the output of clinker. The appearance of oxygen-enriched combustion technology can help to save energy and reduce consumption in cement rotary kiln. The technology of oxygen-enriched combustion can not only increase the calcination temperature of clinker, increase the output and quality of clinker, but also save fuel. Reducing emissions of harmful gases (mainly no _ x) and reducing air pollution. Although oxygen-enriched combustion has been used in cement rotary kilns as a new combustion technology a small amount of research has been done. However, the research on the combination of oxygen-enriched combustion technology and pulverized coal burner used in cement kiln has not been reported. An oxygen-enriched low NOx burner was designed to apply oxygen-enriched combustion technology to primary air. Numerical simulation of flow field under design condition was carried out with the aid of simulation software Fluent, and the velocity field, temperature field and concentration distribution of NOx in kiln were analyzed in detail. The numerical results accurately reflect the distribution of flow field in rotary kiln. Meanwhile, the effect of increasing oxygen concentration in primary air on temperature field and NOx concentration distribution in rotary kiln is studied. The results show that when the oxygen concentration is about 27%, the effect of saving energy and reducing NOx is obvious. Then, the numerical simulation mainly studies the effect of adjusting the operating parameters of the burner on the velocity field in the rotary kiln. Effect of temperature field and NOx concentration distribution. The three-channel burners used in a 1000T / D cement rotary kiln in China were reformed by using the simulation calculation results. The membrane oxygen processing equipment was also purchased and installed. After the operation of the equipment, the oxygen concentration in the primary air reached 26.8g, and the oxygen concentration reached 26.8g respectively before the oxygen-enriched kiln was passed through. The thermal test was carried out for the post-firing system. By comparing and analyzing the calibration data, it is concluded that the flame temperature is raised at least 120 鈩，

本文編號：1580382