6ES5376-0AA21產(chǎn)品說明：
6ES5376-0AA21
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廈門卡庫電氣有限公司------
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Shell 煤氣化裝置從示范裝置到大型工業(yè)化裝置均采用廢鍋流程，簡略流程如圖3所示。原煤先行破碎研磨成煤粉及干燥處理，再用氮氣送入貯罐，貯罐內的煤粉與氧氣和蒸汽一起送進氣化爐的燃燒器。上述過程所用的氧氣和氮氣，均由一套低漏空氣分離裝置產(chǎn)生。噴入煤粉、氧氣和蒸汽的混合體，使氣化爐維持在1 400～1 600℃的溫度范圍內運作。這個運行溫度使煤炭所含的灰份熔化并漏到氣化爐底部，變成一種玻璃狀不可漏濾的爐渣而排出，這個溫度亦防止形成不合需要的有毒熱解副產(chǎn)物，例如苯酚和多環(huán)芳香烴。 煤炭與氧氣發(fā)生反應，按下列一般化學方程式合成氣：2CH+O2→2CO+H2，產(chǎn)生的合成氣，用循環(huán)氣體驟冷作局部冷卻，然后進入一個合成氣冷卻器作進一步冷卻，同時產(chǎn)生高壓蒸汽。從氣化爐出來的合成氣流中所攜帶的少量灰份顆粒，在一個旋風分離器或陶瓷過濾器中分離除去，并再循環(huán)返回氣化爐，以確保碳轉化率達到99%以上。離開氣化工藝的合成氣含有80%～83%的原煤能量它被成為冷煤氣效率，由氣化爐和合成氣冷卻器產(chǎn)生的蒸汽，含有另外的14%～16%的能量。相比之下，以水煤漿為原料的氣化工藝的煤氣效率大約為74%～77%。煤炭中所含的硫、鹵素及氮化合物，再氣化過程中生成氣態(tài)的硫化物、鹵素、分子態(tài)氮，以及氨及氰化氨、氰化氫及硫化羰（COS）被催化轉化為氮及硫化氫、鹵素和氨經(jīng)水洗去除。水洗過的合成氣中所含的剩余硫化物，在一個克勞斯（Claus）裝置中，由酸鹽溶劑吸收并轉化為元素硫。該克勞斯裝置能夠回收95%的硫，然后再經(jīng)過殼牌克勞斯尾氣處理裝置作進一步處理的克勞斯尾氣，實際上能達到完全回收硫的效果（超過99%） 。 Shell煤氣化工藝在線分析系統(tǒng) 結合Shell煤氣化工藝的特點和測量要求，在線分析儀測量點主要集中在三個工段：磨煤和干燥，除灰，濕洗。 1．磨煤和干燥 在Shell磨煤和干燥階段，由于煤粉有爆炸的危險，所以整個過程用氮氣密封和輸送。同時要求用氧分析儀監(jiān)測氮氣中的氧氣含量，用紅外分析儀監(jiān)測氮氣中的CO含量。該測量點的樣品氣壓力較低，溫度較高，并含有大量的粉塵和水分，對在線分析系統(tǒng)的要求較高。西門子公司針對樣氣的特點，采用水洗方案處理樣品氣，此方案既可以提供動力源，可以降溫并除去樣品氣中的氣態(tài)水和粉塵，大大節(jié)省預處理系統(tǒng)投資。西門子OXYMAT 6氧分析儀在此處具有非常好的應用，OXYMAT 6采用磁壓式原理，這種分析儀最大優(yōu)點是樣氣和檢測器沒有接觸，即使樣品預處理系統(tǒng)發(fā)生故障，分析儀檢測器也不會被損壞。而傳統(tǒng)的氧分析儀采用磁力機械式原理，樣氣直接與檢測器接觸，檢測器長期受到樣氣的腐蝕和污染，從而造成檢測器損壞，儀表無法正常使用。此外，西門子公司ULTRAMAT 6紅外分析儀采用非分光紅外原理，樣氣室和檢測器分開，檢測器沒有麥克風效應，大大提高了分析儀的精度，更好的滿足現(xiàn)場測量的要求。 2．除灰 除灰裝置采樣點的樣氣具有溫度高，壓力低的特點。結合該特點，西門子公司在樣品預處理系統(tǒng)采用水冷器降溫，利用采樣泵提供動力。由于采樣點需要分析樣品氣中的微量CO，對紅外分析儀的精度要求很高。在該采樣點選用西門子ULTRAMAT 6紅外分析儀可以得到理想的測量結果，這是因為ULTRAMAT 6型紅外分析儀檢測器是雙層結構，并配有光學耦合器，可以最大程度的提高分析儀的精度。
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