基于CFD計算的管式加熱爐燃?xì)夥旨壍蚇O_x燃燒器研究
發(fā)布時間:2018-07-16 23:33
【摘要】:以某石化公司低NO_x燃燒器改造項目中管式加熱爐內(nèi)0.7 MW擴(kuò)散式燃?xì)馊紵鳛檠芯繉ο?提出了兩種低NO_x改進(jìn)方案。方案A采用傳統(tǒng)燃料分級供給形式,方案B在采用燃料分級供給的同時還采用了特殊耐火磚結(jié)構(gòu)。應(yīng)用計算流體力學(xué)(CFD)軟件Fluent對燃燒器兩種改進(jìn)方案的燃燒過程和NO排放進(jìn)行了數(shù)值模擬,獲得燃燒室內(nèi)溫度分布、組分分布、NO生成速率以及火焰形態(tài)等參數(shù)。比較計算結(jié)果發(fā)現(xiàn),燃燒器方案B的結(jié)構(gòu)能夠合理地組織燃燒區(qū)的流場,改善火焰形態(tài),提高火焰?zhèn)鳠嵝?防止局部熱點的形成,使溫度分布更均勻。與方案A相比,方案B的峰值溫度降低了233K,出口處NO的平均體積分?jǐn)?shù)降低了19.3μL/L,抑制NO排放的效果更好。
[Abstract]:Taking the 0.7 MW diffusive gas burner in the tube furnace of a petrochemical company as the research object, two improvement schemes of low no _ x are put forward. Scheme A adopts the traditional fuel staged supply form, while Plan B adopts the special refractory brick structure while using the fuel staged supply. The combustion process and no emission of two improved schemes were numerically simulated by CFD software fluent. The combustion chamber temperature distribution, composition distribution, no formation rate and flame morphology were obtained. The results show that the structure of the burner scheme B can reasonably organize the flow field in the combustion zone, improve the flame shape, improve the flame heat transfer efficiency, prevent the formation of local hot spots, and make the temperature distribution more uniform. Compared with scenario A, the peak temperature of scheme B was reduced by 233K, and the mean volume fraction of no at the outlet was reduced by 19.3 渭 L / L, so the inhibition effect of no emission was better.
【作者單位】: 北京航空航天大學(xué)航空科學(xué)與工程學(xué)院;
【基金】:中國石油化工股份有限公司天津分公司科技項目(31800000)資助
【分類號】:TE963
本文編號:2128048
[Abstract]:Taking the 0.7 MW diffusive gas burner in the tube furnace of a petrochemical company as the research object, two improvement schemes of low no _ x are put forward. Scheme A adopts the traditional fuel staged supply form, while Plan B adopts the special refractory brick structure while using the fuel staged supply. The combustion process and no emission of two improved schemes were numerically simulated by CFD software fluent. The combustion chamber temperature distribution, composition distribution, no formation rate and flame morphology were obtained. The results show that the structure of the burner scheme B can reasonably organize the flow field in the combustion zone, improve the flame shape, improve the flame heat transfer efficiency, prevent the formation of local hot spots, and make the temperature distribution more uniform. Compared with scenario A, the peak temperature of scheme B was reduced by 233K, and the mean volume fraction of no at the outlet was reduced by 19.3 渭 L / L, so the inhibition effect of no emission was better.
【作者單位】: 北京航空航天大學(xué)航空科學(xué)與工程學(xué)院;
【基金】:中國石油化工股份有限公司天津分公司科技項目(31800000)資助
【分類號】:TE963
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