无烟粉煤成型块炭化行为及热解气体生成规律

The characteristics of anthracite briquette carbonization and the regularity of pyrolysis gas generation during carbonization

采用自制炭化装置研究了含有球化剂和黏结剂的无烟粉煤成型块在炭化过程中的收缩特性,用显微热台考察了煤微粒热解时微粒面积随温度变化的关系,用GC考察了型煤炭化过程中热解气生成规律。研究结果表明:无烟粉煤成型块在炭化过程中分别在150℃和600℃左右有明显的收缩峰,其炭化分为不同于烟煤的5个阶段,即干燥-预热-软化阶段(<480℃)、热分解开始阶段(480～550℃)、热解-黏结阶段(550～600℃)、固-胶体固化阶段(600～630℃)和固化型煤收缩阶段(600～900℃)。其中第2阶段热解气中的CO2、C2H4、C2H6、CO和CH4含量达到45.62%;第5阶段析出的气体开始以CH4和H2为主,后期主要是H2。

An investigation was made using self-made carbonization device to understand the shrinkage characteristics anthracite briquette containing binder and spheroidizer during carbonization,the micro heating stage and GC were employed to study the particle area which changed with increasing the temperature by means of image analysis on the micro-picture and regularity of pyrolysis gas generation respectively.The results show that the shrink peaks appear at about 150 ℃ and 600 ℃ during carbonization,and the carbonization is divided into five stages which are different from bituminous coal：the dry-warm-softening stage（480 ℃）,the beginning of thermal decomposition（500～550 ℃）,pyrolysis-bonding stage（550～600 ℃）,solid-gel curing stage（600～630 ℃） and the curing coal contraction stage（600～900 ℃）.The content of pyrolysis gas of CO2,C2H4,C2H6,CO and CH4reached 45.62%;at the beginning of fifth stage,the gas composed mainly of CH4 and H2,then in the end of carbonization,the gas mainly composed by H2.