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              PLC企業資訊
                6SL3000-0BE21-6AA0
                發布者:gw0002  發布時間:2018-08-29 09:00:06

                6SL3000-0BE21-6AA0

                6SL3000-0BE21-6AA0

                6SL3000-0BE21-6AA0

                6SL3000-0BE21-6AA0

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                空氣氧化法制備甲醛有兩條工藝路線:1、以電解銀,浮石銀為催化劑的銀法工藝,使用這種方法時,甲醇在原料混合氣中的濃度高于爆炸極限區上限(36%),即在甲醇過量的情況下操作,由于反應氧化不足,反應溫度較高(一般為600~720℃),有脫氫反應同時發生,所以又稱氧化-脫氫工藝。2、以Fe2O3-MoO作為催化劑的鐵法工藝,此法是在空氣-甲醇混合氣中甲醇濃度低于爆炸區的下限(小于6.7%),即在含有過量的空氣情況下操作,由于空氣過剩,甲醇幾乎全部被氧化,所以又稱此法為純粹的氧化工藝。

                圖1 甲醛工藝流程

                     

                原料甲醇由甲醇計量槽經甲醇泵輸送至甲醇高位槽,保持一定流量經過濾后進入甲醇蒸發器,同時由羅茨風機將經過濾后的空氣送入甲醇蒸發器底部。甲醇經過加熱氣化及空氣夾帶,與空氣形成二元混合氣;再和通入一定流量的蒸汽相混合,形成三元混合氣,三元混合氣經過熱器過熱后,進入阻火過濾器,再次過濾后的三元混合氣進入氧化器,在氧化室加熱元件的高溫與電解銀催化劑的作用下,發生氧化脫氫反應。反應氣體快速經過氧化器急冷段并在急冷段的冷卻下,進入1#吸收塔循環吸收,循環液部分采出即為成品甲醛溶液(濃度37%左右),并進入甲醛計量槽及甲醛成品槽。經1#吸收塔循環吸收后的尾氣進入2#吸收塔,以脫鹽水作為吸收劑,經2#吸收塔循環吸收收的尾氣,經尾氣液封槽,最終進入尾氣處理裝置作為燃料燃燒,燃燒后的尾氣直接進入大氣,達到零污染排放。

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