宁东煤田侏罗纪煤岩煤质特征及清洁高效利用

Petrographic,quality characteristics and clean&efficient use of Jurassic coal in Ningdong coalfield

宁东煤田侏罗纪煤炭资源量巨大,是当前宁夏回族自治区煤炭资源开发利用的主体。为保障煤炭资源的清洁高效利用,以煤田大量勘查资料为主要依据,分析了宁东煤田侏罗纪煤的煤岩、煤质特征。结果显示:宁东煤田侏罗纪煤具有特低-低灰、特低-低硫、低磷、低砷、低氟、高发热量的特征,这些特征表明其为高清洁度动力用煤;同时还具有中高挥发分、较高氢碳原子比、焦油产率较低(普遍<7%)及富惰质组等特征表明不适于直接液化用或提取煤焦油。无黏结性、较低水分产率、较高的与二氧化碳反应性(950℃)、煤灰熔融温度,表明其适于气化,且以水煤浆气流床和干煤粉气流床为宜。综合认为研究区煤炭资源的清洁高效利用方式为动力用煤,气化用煤及以气化为基础的间接液化用煤。

Jurassic coal resources in Ningdong coalfield are huge,also play important role in coal resource development and utilization in Ningxia.For the purpose of clean and efficient use of Jurassic coal in Ningdong coalfield,coal quality and petrographic characteristics were analyzed based on coalfield exploration data.The results show that Jurassic coal in Ningdong coalfield is characterized by very low to low ash,very low to low sulfur content,low phosphorus,low arsenic,low fluorine and high heating value,these characters indicate that Jurassic coal is clean power coal.Besides that,it has medium to high volatile,higher H/C,lower tar yield and abundant inertinite,these characters determined that the coal is neither suitable for direct liquidation nor for extraction of coal tar.The others characteristics like no caking,lower moisture,relatively higher a(950℃)and ash melting temperature indicate its suitability for gasification mainly through entrained-flow bed of water slurry and dry feed entrained flow bed.We suggest that Jurassic coal in Ningdong coalfield should be used as power coal and gasification coal,as well as indirect liquefactions based on gasification.