6ES5376-0AA21產(chǎn)品說(shuō)明：
6ES5376-0AA21
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廈門(mén)卡庫(kù)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(jiǎn)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?dú)馑腿胭A罐，貯罐內(nèi)的煤粉與氧氣和蒸汽一起送進(jìn)氣化爐的燃燒器。上述過(guò)程所用的氧氣和氮?dú)猓梢惶椎吐┛諝夥蛛x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(nèi)運(yùn)作。這個(gè)運(yùn)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(gè)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(yīng)，按下列一般化學(xué)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(jìn)入一個(gè)合成氣冷卻器作進(jìn)一步冷卻，同時(shí)產(chǎn)生高壓蒸汽。從氣化爐出來(lái)的合成氣流中所攜帶的少量灰份顆粒，在一個(gè)旋風(fēng)分離器或陶瓷過(guò)濾器中分離除去，并再循環(huán)返回氣化爐，以確保碳轉(zhuǎn)化率達(dá)到99%以上。離開(kāi)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(guò)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(zhuǎn)化為氮及硫化氫、鹵素和氨經(jīng)水洗去除。水洗過(guò)的合成氣中所含的剩余硫化物，在一個(gè)克勞斯（Claus）裝置中，由酸鹽溶劑吸收并轉(zhuǎn)化為元素硫。該克勞斯裝置能夠回收95%的硫，然后再經(jīng)過(guò)殼牌克勞斯尾氣處理裝置作進(jìn)一步處理的克勞斯尾氣，實(shí)際上能達(dá)到完全回收硫的效果（超過(guò)99%） 。 Shell煤氣化工藝在線分析系統(tǒng) 結(jié)合Shell煤氣化工藝的特點(diǎn)和測(cè)量要求，在線分析儀測(cè)量點(diǎn)主要集中在三個(gè)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(xiǎn)，所以整個(gè)過(guò)程用氮?dú)饷芊夂洼斔汀Ｍ瑫r(shí)要求用氧分析儀監(jiān)測(cè)氮?dú)庵械难鯕夂?，用紅外分析儀監(jiān)測(cè)氮?dú)庵械腃O含量。該測(cè)量點(diǎn)的樣品氣壓力較低，溫度較高，并含有大量的粉塵和水分，對(duì)在線分析系統(tǒng)的要求較高。西門(mén)子公司針對(duì)樣氣的特點(diǎn)，采用水洗方案處理樣品氣，此方案既可以提供動(dòng)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(yù)處理系統(tǒng)投資。西門(mén)子OXYMAT 6氧分析儀在此處具有非常好的應(yīng)用，OXYMAT 6采用磁壓式原理，這種分析儀最大優(yōu)點(diǎn)是樣氣和檢測(cè)器沒(méi)有接觸，即使樣品預(yù)處理系統(tǒng)發(fā)生故障，分析儀檢測(cè)器也不會(huì)被損壞。而傳統(tǒng)的氧分析儀采用磁力機(jī)械式原理，樣氣直接與檢測(cè)器接觸，檢測(cè)器長(zhǎng)期受到樣氣的腐蝕和污染，從而造成檢測(cè)器損壞，儀表無(wú)法正常使用。此外，西門(mén)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(cè)器分開(kāi)，檢測(cè)器沒(méi)有麥克風(fēng)效應(yīng)，大大提高了分析儀的精度，更好的滿足現(xiàn)場(chǎng)測(cè)量的要求。 2．除灰 除灰裝置采樣點(diǎn)的樣氣具有溫度高，壓力低的特點(diǎn)。結(jié)合該特點(diǎn)，西門(mén)子公司在樣品預(yù)處理系統(tǒng)采用水冷器降溫，利用采樣泵提供動(dòng)力。由于采樣點(diǎn)需要分析樣品氣中的微量CO，對(duì)紅外分析儀的精度要求很高。在該采樣點(diǎn)選用西門(mén)子ULTRAMAT 6紅外分析儀可以得到理想的測(cè)量結(jié)果，這是因?yàn)閁LTRAMAT 6型紅外分析儀檢測(cè)器是雙層結(jié)構(gòu)，并配有光學(xué)耦合器，可以最大程度的提高分析儀的精度。
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