描述
制氮機(jī)的工作流程是由可編程控制器控制三個(gè)先導(dǎo)電磁閥，再由電磁閥分別控制八個(gè)氣動(dòng)管道閥的開、閉來完成的。三個(gè)先導(dǎo)電磁閥分別控制左吸、均壓、右排狀態(tài)。左吸、均壓、右排的時(shí)間流程已經(jīng)存儲(chǔ)在可編程控制器中當(dāng)流程處于左吸狀態(tài)時(shí)，控制左吸的電磁閥通電，先導(dǎo)氣接通左吸進(jìn)氣閥、左吸產(chǎn)氣閥、右排氣閥，使得這三個(gè)閥門打開，完成左吸過程，同時(shí)右吸附罐解吸。當(dāng)流程處于均壓狀態(tài)時(shí)，控制均壓的電磁閥通電，其它閥關(guān)閉；先導(dǎo)氣接通上均壓閥、下均壓閥，使得這兩個(gè)閥門打開，完成均壓過程。從上文的PSA型制氮機(jī)原理我們可知變壓吸附制氮機(jī)的吸附罐，在壓力高時(shí)，碳分子篩吸附空氣中的氧，而不易被吸附的氮?dú)獬蔀楫a(chǎn)品；在壓力低時(shí)，氧從碳分子篩中脫附出來。利用壓力的變化，就能有效地從空氣中分離出所需要的氮?dú)?。其中，在測(cè)試氮?dú)庵械难鯕鉂舛鹊臅r(shí)候，因?yàn)榇蠖嗍嵌际俏⒘考?jí)別的，所以工采網(wǎng)推薦了一款美國Southland 氧氣分析儀 – OMD-640。
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