共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
本文概述十多年来国内转炉烟道冷却系统的发展过程,由部分汽化冷却发展到全汽化冷却。在烟道结构上作了许多重要的改革。着重叙述了密排式烟道和活动烟罩升降的球形活接头等关键部份的结构和使用情况。全汽化冷却的转炉烟道不但大量节约水和电,而且增加蒸发受热面积,扩大余热利用.密排式烟道制造方便,焊接工作量大幅度减少。在上钢一厂使用的全汽化冷却烟道已使用15500余炉次,热疲劳循环次数已达到世界先进水平。 相似文献
4.
5.
6.
热丝TIG焊在转炉汽化冷却烟道制造中的应用 总被引:3,自引:2,他引:1
根据转炉汽化烟道的结构特点,针对如何提高汽化烟道制造的生产效率和保证受热管对接焊接质量这一难题,一种适于小直径、中厚壁管子的固定位置对接焊的、较为成熟、焊接效率高、焊接质量好、适用较广的热丝TIG焊成为解决该难题的发展方向.从基本原理、特点、工艺研究和实际应用等方面对热丝TIG焊在汽化烟道制作中的应用进行了探讨. 相似文献
7.
杨海学 《锻压装备与制造技术》1991,(4)
我厂有0.5t到5t蒸汽—空气锤10台,为了延长盘根的寿命,我们根据液压设备中运动部件间的密封经验,考虑到锤杆运动速度较快,压缩空气压力在0.3~0.8MPa,在不改变锤杆密封结构(除密封件外)的情况下,采用材料为 相似文献
8.
对生产中碳铬铁的两种工艺方法作了对比。转炉法具有节电、铬回收率高、成本低、炉龄长等优点。与电硅热法相比,转炉法吹炼一吨中碳铬铁可节电2000度。在当前电力供应紧张的情况下,采用转炉法代替电硅热法工艺,具有十分重要的经济意义。本文还简要介绍了转炉吹炼铬铁的热力学基础、操作过程、和新建2.5吨转炉的设备特点。 相似文献
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
For steam tubes used in thermal power plant, the inner and outer walls were operated in high-temperature steam and flue gas environments respectively. In this study, structure, microstructure and chemical composition of oxide films on inner and outer walls of ex-service low Cr ferritic steel G102 tube and ex-service high Cr ferritic steel T91 tube were analyzed. The oxide film was composed of outer oxide layer, inner oxide layer and internal oxidation zone. The outer oxide layer on the original surface of tube had a porous structure containing Fe oxides formed by diffusion and oxidation of Fe. More specially, the outer oxide layer formed in flue gas environment would mix with coal combustion products during the growth process. The inner oxide layer below the original surface of tube was made of Fe-Cr spinel. The internal oxidation zone was believed to be the precursor stage of inner oxide layer. The formation of internal oxidation zone was due to O diffusing along grain boundaries to form oxide. There were Fe-Cr-Si oxides discontinuously distributed along grain boundaries in the internal oxidation zone of G102, while there were Fe-Cr oxides continuously distributed along grain boundaries in that of T91. 相似文献
19.
本文通过对用于麻石烟气脱硫装置的3#和2#耐酸胶泥的单因素对比试验的研究,得出2#胶泥耐酸度较好,因而防腐性能也较好。这不仅回收了固废,而且还具有可观的环境效益。 相似文献