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氨氣的用途較廣那么都用于哪些地方呢
人們一提到氨氣,往往只想到它那令人難聞的氣味。的確,氨有一股刺 激性的惡臭,空氣中只要含氨0.037毫 克/升,人們就能聞到氣味;超過1.2毫克/升,則會感到強烈刺 激。按照規定,空氣中的高含氨量不得超過0.03毫克/升。如果氨氣大量外泄,特別是氨 瓶爆炸,氨的管道、閥門損壞,則擴散后對人的安全將會造成嚴重威脅。
十堰高純氨氣的用途較廣,十堰工業氨氣批發表示它可用于制作銨鹽、硝酸銨和尿素,冷藏庫內還用它作致冷劑。氨非常容易液化,在常溫下,加壓至7~8公斤力/厘米2就會變成液氨。液氨易 溶于水,1份水能溶700份液氨。氨的水溶液叫氨水。氨水中只有少量氨與水反應,其余仍以氨的形式存在,所以,經常有氨氣逸出。氨不僅有毒,還會爆炸。1982年12月,浙江省某鋼廠對一只曾盛放過液氨的貯罐動火焊接時,因罐內殘剩的氨氣達到爆炸極限,遇明火發生爆炸。
有人認為氨有特殊氣味,稍有泄漏,馬上便能發覺;它的爆炸下限又比較高,不大容易達到爆炸極限,因而忽視了防爆安全工作,這其實也是錯誤的。盡管少量 泄漏,確實不易達到爆炸極限濃度,但是,當氨瓶爆炸,或管道、閥門損壞時,則在極短的時間內就會有大量的氨沖出,極有可能達到爆炸極限。所以,決不能掉以 輕心。例如,氨壓縮機房,電氣設備要符合防爆要求,要考慮泄壓設施;液氨瓶不得靠近明火,不能受陽光曝曬;液氨、氨水貯槽等都要注意防暑降溫。又如:熏箱,不可用明火對氨水直接加熱,并注意適當通風,防止逸出的氨氣達到爆炸極限;氨不能與氟、氯、溴、碘及酸類混存;液氨貯槽的灌裝量不能超過總容量的 85%。
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