CaSO_(4)、CaO与CaCl_(2)对神府低变质煤的低温热解影响研究

The Influence of CaSO_(4),CaO and CaCl_(2) on the Low-temperature Pyrolysis of Shenfu Low Metamorphic Coal

用共混法将CaSO_(4)、CaO与CaCl_(2)催化剂分别按不同配比与神府低变质煤混合,在铝甑中进行低温催化热解实验,以探索CaSO_(4)、CaO与CaCl_(2)催化剂对神府低变质煤热解的影响.结果表明:在相同反应条件下,加入CaSO_(4)和CaCl_(2)催化剂可提高焦油产率、半焦产率、热解水产率,降低煤气产率;加入CaO催化剂轻微降低了焦油的产率,相对于原煤热解煤焦油的含量仅下降了0.03%,但半焦产率降低了4.79%,煤气产率增加了4.37%,变化十分显著,且CaO催化剂对煤焦油轻组分的选择性极强,使原煤中C20以上物质的相对含量从12.40%下降到1.51%,长链烯烃极少,烷烃类物质基本没有,且催化热解后煤焦油中苯酚类、萘类、菲类和蒽类物质相对含量较原煤焦油中的多,并产生了原煤焦油中不具备的醇和茚类物质.

The different ratios of CaSO_(4),CaO and CaCl_(2) catalysts were mixed with Shenfu low-metamorphic coal,and low-temperature catalytic pyrolysis experiments were carried out in aluminum retort to explore the effect of CaSO_(4),CaO and CaCl_(2) catalysts on the pyrolysis of shenfu low-metamorphic coal.The results showed that under the same reaction conditions,adding CaSO_(4) and CaCl_(2) catalysts could increase tar yield,semi-coke yield,pyrolysis water yield,and reduce gas yield.Adding CaO catalyst slightly reduced tar yield.Compared with the pyrolysis of raw coal,the content of coal tar only decreased by 0.03%,but the semi-coke yield decreased by 4.79%,and the gas yield increased by 4.37%.The change was very significant.Moreover,the CaO catalyst was extremely selective for the light components of coal tar,which reduced the relative content of more than C20 in raw coal from 12.40%to 1.51%.There were very few long-chain olefin,almost no alkane.The relative content of phenol,naphthalene,phenanthrene and anthracene in coal tar after catalytic pyrolysis was higher than those in raw coal tar,and alcohol and indene which are not found in raw coal tar were produced.