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湖北当阳电厂爆炸事件6名责任人被控制

2016-08-13 04:01:54   新京报

蒸汽外泄点位于三楼的中控台,长约20米,中控台与管道之间为双层玻璃隔开。管道直径426mm,外层包有300mm左右厚度的白色保温棉。“一靠近就全身发热,站两分钟就满头大汗,不到10分钟就要到外面去喘口气。”

在工人们看来,哪怕一个小孔蒸汽外泄也能致命,“像针一样,高温可以把身体刺穿。”

此次高压蒸汽管道爆裂的原因何在?

据国家安监总局消息,经初步调查分析,事故主要原因是,2号锅炉蒸汽出口处主管道流量计阀门焊缝裂开,大量高温高压蒸汽外溢,致主控室玻璃破裂,造成主控室人员严重伤亡。事故详细原因正在进一步调查中。

国家电网中国电力科学研究院副总工程师蔡国雄介绍,出现事故的蒸汽管道,是火电厂的标配。操作中,一般会将煤炭和煤矸石混合燃烧,待锅炉燃烧结 束后产生蒸汽,再用蒸汽推动蒸汽轮机。其中,锅炉和蒸汽轮机间有一段距离,此次发生事故的就是这一部分输送高温高压蒸汽的管道。

他说,管道焊接位置的强度弱于其他部分,如果存在焊接质量不好,或在长期运行中,焊缝处逐渐发生开裂均可能出现问题。因此,平日里,对焊接处进 行检测尤为重要。一般情况下,在焊接后,还要对焊缝质量进行超声波鉴定,确保每条焊缝的安全。“一旦瞬间蒸汽流量变大,锅炉压力和温度增高,就可能导致焊 缝开裂”。

“蒸汽本身没有毒性,但温度和压力很高,厂房是封闭的,冲击波会把建筑物、窗户打碎,人一下子会被推倒,造成烫伤等情况。”他说,主控室日常并 不需要太多运行人员,但如果当时正在调试,有可能安装和调试人员均在现场,数百摄氏度的蒸汽确实可能会造成较大的人员伤亡情况。

焦点2 死伤者身份

均为公司员工,最小22岁

当阳市人民医院重症监护室门口,黄华林的姐夫姚平彻夜未眠。他介绍,48岁的黄华林是发电厂的“元老”,10多年前在马店村建厂时就第一批入厂,还被派到江西学习管理仪器。

事发当天,黄华林是白班,还有2个多小时就要下班了,然而,事故发生,他的烧伤面积达80%。“全身都是黑的,眼睛睁不开,手上起了泡,腿上缠着纱布,话也说不出来了”。

24岁的罗文是这次事故5名伤者中最年轻、也是烧伤最严重的,达90%。“医生说目前仍有意识,喊他名字能做出反应,眼能睁开,就是肿得厉害。”其家属介绍。

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