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《鞍钢技术》1985,(9)
转炉炉衬的火焰喷补新工艺苏联日丹诺夫伊里奇钢铁厂为进一步提高氧气炼钢转炉的炉龄,研制成功了一种新的热喷补工艺,称之为涡流-火焰喷补工艺。为了改进喷补料的性能使之能牢固的与炉衬熔接在一起,而采用了以镁粉为主并加入了一定量的焦炭的喷补料。将粉碎后的熊炭加入到喷补料中,可以大大减轻采用风动法输送喷补料时的困难.经测定,焦炭颗粒在1400℃下的发火时间为0.3s,超过了它由喷嘴喷射到炉衬的时间,焦炭颗粒被喷射到炉衬表面后,在氧气流中及在与镁粉的直接接触中燃烧,从而可将镁粉颗粒迅速加热到塑性状态,使之能和炉衬表面牢固地熔接在一起而形成喷补层.焦炭颗粒在燃烧后所形成的燃烧层可提高炉衬喷补层的气孔率.该厂为提高喷补效率而采用了 相似文献
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由于半干法喷补初引进包钢,我们对此项新工艺进行了一年多的探索,初步掌握了喷补料的粒度配比及物理化学性能对使用效果的影响,分析了外加剂的作用,总结出了一套行之有效的喷补参数,如:风压水压,混水比、炉膛温度,喷补距离等。 相似文献
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据“铁钢”1983:S224,S225,S226报道,一种耐蚀性能好,能在炉衬砖面上形成高熔点(高MgO)喷补层的丙烷火焰喷补法已用於转炉炉衬修补。 1 喷补装置为研究丙烷火焰喷补法,首先试制了表1(A)试验装置(图略)。喷补料由丙烷气体载送,在丙烷—氧气火焰中喷出。 相似文献
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分别采用转炉渣、矾土粉、粘土粉作为结合剂,以镁砂为骨料,配制系列喷补料。用小型火焰喷补机在热模拟炉上进行火焰喷朴实验。试验发现结合剂的种类和用量对喷补性能有较大的影响。当结合剂用量约为15%时,其附着率和粘结强度都较好。 相似文献
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通过对喷补料的骨料及粒度组成、喷补料增塑剂、化学结合剂、促进剂等试验,选择了适宜加入量,研制了半干法喷补料,并在第一炼钢厂使用。 相似文献
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详细介绍转炉喷补装置的设备性能及工艺参数、操作要点,喷补料的材料配比及理化性能,确定影响喷补料附着率的主要因素--用水量、结合剂数量、喷补距离的最佳值。采用此喷被料已取得满意效果。 相似文献
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高炉喷补后的炉况恢复 总被引:1,自引:0,他引:1
高炉炉衬喷补修复技术是近年来发展起来的具有实用价值的新技术。根据首钢已进行的30余次喷补后炉况恢复经验,对炉况一次快速恢复成功,喷涂后反弹料的造渣、出渣、出铁等问题进行了研讨。高炉炉衬喷补修复技术的关键是控制好整个恢复期的炉温变化和配合好炉内外工作。 相似文献
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《Acta Metallurgica Materialia》1990,38(11):2193-2198
The model developed in Part I of this study, has been extended to a ZrO2 particle here. It was found that the temperature and the velocity of a ZrO2 particle, computed by assuming a constant average plasma temperature, deviate significantly from those calculated by considering the variation of the plasma temperature with the distance from the nozzle, as in the actual case. Again, it was found that the particle size reduction due to vaporisation cannot be neglected for particles moving close to the axis of the flame. The injection distance and the injection velocity were identified as two important spray parameters. It was noted that ZrO2 particles within a certain size range should be used for developing coatings. The computations also revealed that the particles travelling in the peripheral region of the flame, do not undergo complete melting. It was experimentally verified that the particle size reduces significantly due to vaporisation. 相似文献
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D. Cheng Q. Xu E. J. Lavernia G. Trapaga 《Metallurgical and Materials Transactions B》2001,32(3):525-535
A one-way coupled mathematical model is formulated to simulate the effects of particle size and morphology on the momentum
and thermal energy transfer of particles during high-velocity oxyfuel (HVOF) thermal spraying. First, computational fluid
dynamic techniques are implemented to solve the Favre-averaged mass, momentum, and energy conservation equations in the gas
phase. The gas dynamic data are then used to model the behavior of particles in the gas field. The concept of sphericity is
used to incorporate the effect of particle morphology into the model. The calculated results show that the particle velocity
and temperature, before impinging onto the substrate, are strongly affected by particle size, morphology, and spray distance.
Smaller particles are accelerated to a higher velocity but slowed down rapidly due to their smaller momentum inertia, while
the larger particles are accelerated with some difficulty. The same tendency is observed regarding the effect of particle
size on its thermal history. 相似文献
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20t电炉炉衬采用半干法喷补工艺工业性应用,喷补强度达到40-70kg/min,喷补后炉龄提高45%,经济益显著。 相似文献
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长钢3号高炉通过合理地选择喷补料,合理组织人员,根据工艺要求严格控制喷补的工艺参数,采用遥控喷补技术对3号高炉进行短时间造衬,使高炉在较短时间内恢复了正常炉型,高炉冶炼得到了恢复和进一步强化。 相似文献