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热风炉热风出口跑风问题该如何处理?

文章出处:   发布时间:2019-01-02 13:17:07   浏览:18

顶燃式热风炉的工作原理:先燃烧煤气,用产生的烟气加热蓄热室的格子砖,再将冷风通过炽热的格子砖进行加热,然后让热风炉轮流交替地进行燃烧和送风,使高炉连续获得高温热风。内燃式热风炉的工作原理:净化的煤气和助燃空气在燃烧器内混合后,进入燃烧室进行燃烧,产生的高温废气经拱顶进入蓄热室,在流经蓄热室时,将携带的热量传给格子砖并贮藏起来;低温废气从烟筒排出。高炉鼓风送来的冷风,在流经蓄热室被加热后,从热风出口经热风围管、风口装置进入高炉。

The working principle of top-fired hot blast stove: first burning gas, heating the lattice bricks of regenerator with the generated flue gas, then heating the cold air through the hot lattice bricks, and then alternately burning and feeding the hot blast stove, so that the blast furnace can continuously obtain high temperature hot air. The working principle of internal combustion hot blast stove: after mixing the purified gas and combustion-supporting air in the burner, they enter the combustion chamber for combustion, and the high-temperature exhaust gas generated enters the regenerator through the vault. When flowing through the regenerator, the heat carried is transferred to the lattice brick and stored; and the low-temperature exhaust gas is discharged from the flue tube. After the cold air from blast furnace flows through regenerator and is heated, it enters the blast furnace from the hot air outlet through the hot air enclosure and tuyere device.

目前热风系统存在的问题。沙钢炼铁厂二车间2号高炉3号热风支管与炉壳本体连接处耐材脱落,导致支管钢壳及炉壳局部表面温度高,尤其是热风支管局部起包发红,钢壳表面出现贯通式裂缝。该车间先后采取了一些技术手段来处理,比如定期对焊缝进行补焊处理、发红部位采取氮气吹扫冷却、每天测温跟踪、开孔灌浆等,但是从处理的结果来看效果不太理想,尤其是在氮气吹扫冷却的情况下,热风炉送风时钢壳表面温度依然达到300摄氏度左右,导致焊缝经常开裂,跑风严重,车间被迫降低风温,对车间正常生产造成很大影响。同时,发红跑风部位存在事故隐患。因跑风部位位于热风炉炉壳本体与热风支管连接处,属于热风系统最薄弱环节,如果处理不当,将造成热风炉大墙倒塌等严重后果。

At present, there are some problems in hot air system. The refractory of No. 3 hot air branch pipe of No. 2 BF in No. 2 Workshop of Shagang Iron and Steel Workshop falls off at the connection point between the branch pipe and the shell body, resulting in high local surface temperature of the branch pipe steel shell and the shell, especially the red package of the hot air branch pipe, and through cracks on the surface of the steel shell. The workshop has adopted some technical means to deal with it, such as regular repair welding of welds, nitrogen purge cooling of reddish parts, daily temperature measurement and tracking, hole grouting, etc. However, the results of the treatment are not satisfactory, especially in the case of nitrogen purge cooling, the surface temperature of steel shell still reaches about 300 degrees Celsius when hot blast stove feeds air, leading to welding. Joints often crack and the wind runs seriously. The workshop is forced to reduce the air temperature, which has a great impact on the normal production of the workshop. At the same time, there are hidden dangers in the reddish runaway area. Because the runaway part is located at the junction of the shell and branch pipe of the hot blast stove, it is the weakest link in the hot blast system. If not handled properly, it will cause serious consequences such as the collapse of the wall of the hot blast stove.

热风出口跑风及钢壳发红原因分析。沙钢2680m3高炉内燃式热风炉热风支管钢壳外径2620mm,送风通道孔径1676mm,钢壳厚度14mm,管道由里向外共砌筑3层砖,工作层为红柱石砖(厚度为152mm);隔热层分别为轻质高铝砖、轻质黏土砖,其砖层总厚度为452mm;热风出口发红跑风部位所处位置正好是热风炉炉壳与热风支管连接处,该部位易破损,使用组合砖砌筑。当热风炉送风时,该位置是受热风冲刷外力最强的部位,长期受到轴向外力作用,导致热风管道钢壳与保温砖之间间隙变大,在钢壳与保温砖之间形成窜风通道。热风出口钢壳外表面长时间处于高温冲刷环境中,钢壳的强度、硬度等被大大降低,从而出现发红起包甚至裂缝。

Reasons analysis of hot air outlet runaway and steel shell redness. Shagang 2680 m3 BF internal combustion hot blast stove hot blast branch pipe steel shell outer diameter 2620 mm, air supply channel aperture 1676mm, steel shell thickness 14mm, pipe from inside to outside a total of three layers of bricks, working layer is andalusite brick (thickness 152 mm); heat insulation layer is light high alumina brick, light clay brick, the total thickness of the brick layer is 452 mm; hot blast outlet red run wind location is exactly the hot blast stove shell. The joint with hot air branch pipe is easy to be damaged, and it is built with composite brick. When the hot blast stove feeds air, this position is the strongest part of the external force scoured by the hot blast, which is subjected to the axial external force for a long time, resulting in the gap between the steel shell of the hot blast pipeline and the insulation brick becoming larger, and forming a channeling passage between the steel shell and the insulation brick. The outer surface of steel shell at hot air outlet is in high temperature scouring environment for a long time. The strength and hardness of steel shell are greatly reduced, resulting in reddish envelope and even cracks. 

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