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1、縱觀世界能源的消耗和使用,自工業(yè)革命以來(lái),最近的二十年內(nèi)消耗了超過(guò)一半的能源,深冷空氣分離制氧是大耗能工業(yè)之一。著眼于節(jié)能降耗,論文根據(jù)研究組的一個(gè)專(zhuān)利提出了一個(gè)新的流程,以用于從空氣(78%N2,21.07%O2,0.93%Ar)制取可用于鋼鐵工業(yè)的高純氧。這個(gè)新流程與傳統(tǒng)低溫空氣分離具有相似的步驟,主要包括:空氣的冷卻、凈化、熱交換和低溫精餾。與傳統(tǒng)空氣分離過(guò)程不同的是,該新流程只包含一個(gè)精餾塔,并將傳統(tǒng)流程中的下塔用一個(gè)氮壓縮機(jī)替
2、代,以用來(lái)壓縮從精餾塔頂部流出的部分氮?dú)狻_@部分流股被最終產(chǎn)品冷卻后送入精餾塔塔底濃縮,并將熱量傳遞給再沸器。然后,這部分流股再與餾出液換熱,并在壓力降低之后送回塔內(nèi)。這樣,該精餾塔便不需外部的加熱或冷卻。利用Aspen Plus對(duì)該流程進(jìn)行了模擬,結(jié)果表明,該流程具有較低的能量消耗,與傳統(tǒng)流程相比,它節(jié)省37.4%的能量。這可歸結(jié)于以下幾個(gè)原因:(1)由于不需外部冷卻介質(zhì)而只需進(jìn)行熱量交換,因此所有的能量都在壓縮機(jī)部分消耗;(2)汽輪
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