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针对自预热辐射管存在的换热效率低及辐射管表面温度均匀性差等问题,本文提出基于富氧燃烧的自预热定向辐射管结构形式.围绕氧气体积分数φ(O_2)-火焰-辐射管温度分布之间的关系展开研究,探讨了φ(O_2)对最高燃烧温度及火焰稳定性的影响,确定合理的φ(O_2)范围.通过数值模拟的方式揭示φ(O_2)对辐射管表面温度均匀性的影响规律.结果表明:1)随着φ(O_2)的增加,最高燃烧温度呈线性增长,火焰最高温度位置不随φ(O_2)变化,其所在位置固定在辐射管1.02 m处; 2)随着φ(O_2)的增加,燃烧器功率先增加后减少,在φ(O_2)=0.27时,燃烧器功率最大. 相似文献
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蓄热式烧嘴热工特性分析 总被引:1,自引:1,他引:0
根据蓄热烧嘴热工特性,对轧钢加热炉采用蜂窝蓄热烧嘴中出现的一些问题进行了分析,总结出合理的蓄热烧嘴的结构、蓄热体尺寸、预热气体流量、烧嘴换向时间等热工参数,提出蜂窝蓄热烧嘴在实际设计中应注意的几个方面,使其发挥更好的换热效果。 相似文献
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蜂窝蓄热烧嘴在轧钢加热炉上应用问题分析 总被引:1,自引:0,他引:1
根据国内轧钢加热炉采用蜂窝蓄热烧嘴出现的一些问题,对烧嘴的结构及性能进行了分析,提出蜂窝蓄热烧嘴在实际设计中应注意的几个问题,使其发挥更好的换热效果。 相似文献
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《Baosteel Technical Research》2010,(Z1):111
High Temperature Air Combustion(HTAC) based on regenerative theory has been used in developed countries in recent years,it has many advantages such as efficient recovery of waste heat,high temperature preheating air,low pollution discharge,and so on.This Technology can be used in various furnaces in mechanical,petroleum,chemical industry.To rebuild traditional radiant-tube combustion system with HTAC technology has become important.In the transformation process,The biggest difficulty encountered is that the stability of burner combustion and control system. Because the exhaust gas heat is absorbed by the regenerator,exhaust gas discharge can be controlled at a very low temperature to realize maximum waste heat recovery.At the same time,it improves the temperature uniformity and improve the heating intensity.Thermal efficiency of the device can reach more than 80%.And compared to the traditional air preheating,21.55%energy can be saved. Revamping on traditional radiant-tube combustion system is technically feasible,but a lot of problems will be involved since the rebuild work is on the old system,this article discusses on the main problem encountered in rebuild process in site. to optimize temperature control and obtain not so high exhaust gas temperature,digital combustion control system is necessary.This control loop consists of big loop and small loop,Big loop controls the load distribution of all burners in each heating zone.Small loop controls each heating zone burner’s burning time. Compared performance of tradition radiant-tube heater with regenerative radiant-tube heater,result that regenerative radiant-tube heater have many advantage in consume fuel.Accordance with experience of replacing tradition radiant-tube heater with regenerative type,give a proposition in combustion control system, pilot burner,flame detection and prevent trouble to rebuild work of CAPL and CGL. It is recommended to use regenerative combustion technology in new annealing Line.Although the investment is 1/3 much more than the traditional combustion system,the energy saving effect is obvious and operating costs decreases.Revamping can be taken step by step according to different heating zones.Although taking a long time,it is safer and it influences the production less. Regenerative combustion burner revamping has become successful.However,the revamping work on different furnaces,particular on continuous annealing furnace with high request for temperature control,need further exploration and research. 相似文献
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针对河北津西正达钢厂加热炉产能不足,炉墙冒火,能耗高,且自动化控制水平落后等一系列问题,对加热炉进行了提产降耗改造。通过选用双蓄热烧嘴、增加炉膛高度,升级自动化控制系统,炉墙、炉顶烧嘴整体浇注等措施,加热能力提高20%,空燃比实现了自动调节,避免了跑火现象,煤气消耗降低了0.15 GJ/t钢,满足了轧钢生产需要。 相似文献
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根据模化理论,针对某大型高炉煤气双蓄热式环形加热炉,按照10∶1的比例建立了实物模型。根据二维PIV测试技术的原理,用高速摄像仪对各加热段炉膛进行示踪粒子拍摄和速度分布测量。研究发现从烧嘴喷出的气流,一般不会从正对的第一个吸风口吸出,越靠近均热段的喷口气流越不容易被最近的排烟口排出,从而延长了炉气在炉内的停留时间,避免了烟气短路;炉膛截面速度变化较大,距离烧嘴口越远,截面上速度越平缓;在一定的气流喷射角度下,喷嘴口两侧有气流旋涡产生;流量越大,气流越容易到达对侧炉墙。 相似文献
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从燃烧学,热传输学的角度,论述了氧燃烧嘴助熔原理。较系统地介绍了氧燃烧嘴的结构,位置,氧燃比的选择及固定式和可伸缩式炉壁烧嘴的比较。同时,列举了国内外一些典型的氧燃烧嘴的应用效果。 相似文献
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