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随着机组向大功率方向发展,蜗壳材质也向低合金高强度方向发展。白山发电厂装有三台30万千瓦水轮机,设计水头126米。2~#机蜗壳采用国产14MnMoVN 28～40mm厚钢板,该机从83年末并网发电以来,连续发生两起罕见的蜗壳开裂事故,自山发电厂特约哈尔滨电机厂,哈尔滨焊接研究所,水电总局等科研单位,协商处理。前后两次历时一个月,均未彻底处理好。致使2~#机带着重大稳患运行。笔者曾目睹2~#蜗壳的组装焊接工作及两次裂纹处理情况,现谈谈一孔之见。
With the unit to the direction of high-power, volute material to low-alloy high strength direction. Baishan Power Plant is equipped with three 300,000-kilowatt turbine, designed head 126 meters. 2 ~ # machine volute domestically produced 14MnMoVN 28 ~ 40mm thick steel plate, the machine from the end of 83 and power generation grid since the continuous occurrence of two rare cases of volute cracking, since the mountain power plant special Harbin Motor Factory, Harbin Welding Institute, Hydropower Administration and other scientific research units, negotiated. Spent two months before and after a month, are not thoroughly dealt with. Cause 2 ~ # machine with great stability running. I have witnessed the assembly of 2 ~ # volute welding work and the two cracks, now talk about a hole in the view.