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style="position:absolute;right:0;bottom:12px"></div> </div> <div id="3hdl9fhhjzd" class="con_con"> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">一、天然氣的理化性質(zhì)</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">1</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、天然氣是一種優(yōu)質(zhì)氣體燃料，主要成分是甲烷（</span><span style="line-height:150%;font-size:12pt;">CH4</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">），也包括一定量的乙烷、丙烷和重質(zhì)碳?xì)浠衔?。還有少量的氮氣、氧氣、二氧化碳和硫化物，具有無色、無味、無毒且無腐蝕之特性。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">2</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、天然氣密度比空氣輕，一旦外泄，容易擴散。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">3</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、天然氣燃燒產(chǎn)物主要是二氧化碳和水。與其它石化燃料相比，天然氣燃燒時僅排放少量的二氧化碳粉塵和極微量的一氧化碳、碳?xì)浠衔?、氮氧化物，有利于保護大氣環(huán)境，尤其是有效抑制和減少二氧化硫和氮氧化物為主體的廢氣污染，將明顯改善城市的空氣質(zhì)量，因此，天然氣是一種清潔的能源。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">4</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、天然氣是一種易燃易爆氣體。其爆炸極限為</span><span style="line-height:150%;font-size:12pt;">5.3</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">％</span><span style="line-height:150%;font-size:12pt;">--1 5</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">％。當(dāng)天然氣與空氣混合后。天然氣濃度在爆炸極限濃度范圍內(nèi)時，就會形成爆炸性混合氣體。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">二、天然氣的應(yīng)用</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">1</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、清潔能源</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">天然氣作為一種優(yōu)質(zhì)、經(jīng)濟方便、清潔綠色的能源，具有使用方便、熱值高、無毒、燃燒后不留殘渣、低成本等優(yōu)點，是營造藍(lán)天城市首選的理想能源。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">2</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、能源的經(jīng)濟性</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">天然氣與液化氣在費用方面相比，天然氣可降低成本費用</span><span style="line-height:150%;font-size:12pt;">50</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">﹪以上，并且比液化氣使用更方便、更安全、更潔凈。天然氣是埋藏在地下的古生物經(jīng)過億萬年的高溫和高壓等作用而形成的可燃?xì)怏w，屬于碳?xì)浠衔?，主要成分為甲烷，具有無毒、無腐蝕性、熱值高、燃燒穩(wěn)定、對環(huán)境污染小等優(yōu)點，譽為二十一世紀(jì)最清潔的能源。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">天然氣應(yīng)用廣泛，市場發(fā)展前景看好，除民用外還可以廣泛應(yīng)用于工商業(yè)各個領(lǐng)域。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">三、天然氣的輸送</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">天然氣通常采用管道供應(yīng)方式，用管道把天然氣從門站經(jīng)過調(diào)壓調(diào)至中壓，再經(jīng)樓棟調(diào)壓箱調(diào)至低壓（</span><span style="line-height:150%;font-size:12pt;">2500Pa</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">）送到千家萬戶，管道供應(yīng)具有安全、穩(wěn)定、衛(wèi)生、方便等特點。從壓力角度而言，天然氣的安全性是可靠的。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">四、安全使用天然氣</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">1</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、防止天然氣泄漏</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">由于天然氣泄漏達(dá)到爆炸極限范圍內(nèi)遇到明火或火花極易發(fā)生燃燒爆炸，威脅人身和財產(chǎn)安全，因此，必須采取措施，防止燃?xì)庑孤Ｓ捎谔烊粴獗旧頍o色無味，為了確保用氣安全，城市燃?xì)馐褂玫墓艿捞烊粴庵屑尤肓诉m量的加臭劑，以便在泄漏時能及時發(fā)現(xiàn)。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-size:12pt;">2</span><span style="line-height:150%;font-family:宋體;font-size:12pt;">、不完全燃燒</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">在一般情況下，天然氣燃燒會產(chǎn)生二氧化碳和水，不會對人體產(chǎn)生任何危害。但在空氣不流通的密封空間里，天然氣同其它類型燃?xì)庖粯?，也會因氧氣不足發(fā)生不完全燃燒而產(chǎn)生一氧化碳，使人中毒，甚至死亡。因此，使用燃?xì)馄骶叩牡胤奖仨毐３挚諝饬魍ǎ热绱蜷_門窗對流，裝設(shè)排風(fēng)設(shè)備等。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <p style="text-indent:24pt;"> <span style="line-height:150%;font-family:宋體;font-size:12pt;">天然氣密度比空氣輕，萬一發(fā)生泄漏會迅速向高處和周邊擴散，不易積聚成爆炸性混合氣體，引發(fā)各類燃?xì)馐鹿实母怕室蚕鄬^小。</span><span style="line-height:150%;font-size:12pt;"></span> </p> <span style="font-family:宋體;font-size:12pt;">綜上所述，掌握安全用氣常識，是安全用氣的根本保障。</span> </div> <div id="3hdl9fhhjzd" class="print_close"> <a href="javascript:window.print()" class="print"><img src="./img/ico-print.gif" alt=""> 打印</a> <a href="javascript:window.close()" class="close"><img src="./img/ico-close.gif" 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