内蒙古霍林河褐煤热力初步改质研究

针对褐煤水分高、易风化破碎、氧化自燃、利用率低等问题,采用热力脱水方法对内蒙古霍林河褐煤进行了实验室改质研究,分析了改质温度、停留时间、原煤粒径对褐煤改质效果的影响。结果表明:改质温度、停留时间对褐煤改质效果影响显著,原煤粒径对褐煤改质影响不明显,当处理温度为300℃,停留时间为20 min时,褐煤改质效果最好;此时,褐煤Mad降低了79.75%,H含量增加了153%,O含量降低了62.47%,C含量提高了72.46%,N含量增加了26.09%,Qgr,ad增加了108.50%,Qnet,M增加了161.86%;褐煤改质过程明显降低了煤中Mad和O含量,并使C含量和发热量大幅提高,改质效果明显,这将为褐煤热力改质的应用奠定基础。 Inner Mongolia lignite has some shortcomings such as high moisture,easy weathering disintegration and oxidation,spontaneous combustion,low utilization rate.In order to upgrade the quality of liginite,do experimental study with thermal dehydration method.Investigate the influence of upgrading temperature,residence time,particle size of raw coal on upgrading effect.The results show that first two factors have obvious effect,while the last one is opposite.When the residence time is 20 minutes and the upgrading temperature is 300 ℃,the upgrading effect shows best.The content of hydrogen,carbon,nitrogen has been improved respectively by 153%,72.46%,26.09%,while the content of moisture and oxygen has been reduced respectively by 79.75% and 62.47%.The gross calorific value and low calorific value has been increased respectively by 108.50% and 161.86%.Upgrading process significantly reduces the moisture content and oxygen content of coal,the carbon content and calorific value also has been greatly improved,which is the basis for thermal upgrading of lignite