贫瘦煤模拟海水催化热解特性的研究
Catalytic pyrolysis characteristics of simulated seawater in lean coal
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摘要: 贫瘦煤地下催化气化过程无法使用固体催化剂,因此要研究廉价的液体催化剂。 为 了探索海水作为煤炭地下气化廉价气化剂的可行性,了解其中的NaCl组分对煤热解和气化 过程的催化作用,以3% 的NaCl溶液(模拟海水)作为催化剂,选取了块度约6cm的陕西王 斜煤矿贫瘦煤进行热解实验,测定了煤块内外升温速率和热解产物焦油的组成,研究了催 化剂对半焦孔结构的影响。 NaCl 催化剂负载量为 0.49% 和 0.53% 的大尺度煤块在 350℃~650℃温度段活化能与原煤相比分别降低39% 和45% ;催化热解焦油中苯系物含 量增加7.8% ,烃类含量煤样Ⅰ减少14.9% 、煤样Ⅱ减少32.4% ;催化热解煤焦的比表面积 显著大于非催化热解的煤焦;热解焦中—OH 键和* *C* *O 键的含量,煤Ⅱ焦<煤Ⅰ焦<原 煤。 结果表明:块状贫瘦煤热解过程中温度传递具有滞后性,海水对煤热解和气化过程有 一定的催化作用。Abstract: Intheunderground catalytic gasification processof lean coal,the solid catalyst cannot be usedandrecovered,soitisnecessarytodevelopaninexpensiveliquidcatalyst.Inordertoexplorethe feasibilityofseawaterasacheapgasificationagentforundergroundcoalgasification,andtounderstand thecatalyticeffectofNaClcomponentoncoalpyrolysisandgasification,thispaperselectstheblocksize with3%NaClsolution(simulatedseawater)ascatalyst.TheleancoalofWangxieCoalMineofabout 6cmwassubjectedtopyrolysistest.Theheatingrateinsideandoutsideofthecoalblockandthecompositionofthepyrolysisproducttarweremeasured.Theinfluenceofthecatalystonthesemi-cokestructurewasstudied.Theresultsshowthatthetemperaturetransferintheprocessofpyrolysisofmassive leancoalhashysteresis.Theactivationenergyoflarge-scalecoalwithadditionofNaClcatalystinthetemperaturerangeof350℃~650℃isreducedby39%and45%,respectively,comparedwiththeraw coal;catalyticpyrolysisThebenzenecontentintarincreasedby7.8%,thehydrocarboncontentofcoal sampleⅠdecreasedby14.9%,coalsampleⅡdecreasedby32.4%;thespecificsurfaceareaofcatalyticpyrolysiscoalcharwassignificantlylargerthanthatofnon-catalyzedpyrolysis;Thecontentof—OH bondand* *C* *OhealthcoalⅡcoke
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