基于真空挤压技术的圆棒型煤成型因素研究  

Research on Forming Factors of Round Rod Briquette Based on Vacuum Extrusion Technology

作　　者：王超 王传志 洪吉祥 Wang Chao;Wang Chuanzhi;Hong Jixiang(The Research Center for Clean Coal Technology and Engineering,Yankuang Group Co.,Ltd.,Shandong Zoucheng 273500;Yankuang Technology Co.,Ltd.,Shandong Zoucheng 273500;Jinan Shanyuan Environmental Protection Technology Co.,Ltd.,Shandong Jinan 250000)

机构地区：[1]兖矿集团洁净煤技术工程研究中心,山东邹城273500 [2]兖矿科技有限公司,山东邹城273500 [3]济南山源环保科技有限公司,山东济南250000

出　　处：《山东煤炭科技》2024年第1期160-163,176,共5页Shandong Coal Science and Technology

摘　　要：针对兖矿枕状型煤采用干法高压(15~20 MPa)对辊成型机制备,存在辊皮寿命周期缩短、维修成本增加,同时枕状型煤不适用于自动化炉具等问题。结合兖矿丰富的烟煤资源,以0~3 mm烟煤为原料,利用真空挤压成型技术,采用湿法成型方式制备圆棒型煤,研究粒度配比、成型压力及水分、烘干时间、黏结剂对圆棒型煤成型质量的影响规律,为中试系统设备选型及工业化型煤生产线设计提供参数指导。结果表明:利用双级锤式破碎机进行两次破碎后的粉煤粒度,可以达到紧密堆积状态,其中1~3 mm粒径占比65%;挤出压力与物料水分呈负相关,正常成型压力为3~5 MPa,生产线成型水分按25%计算所需外水加入量;设定干燥理论公式边界条件,为不同干燥温度下的烘干时间计算提供依据,利用网带式烘干机,130℃干燥温度下,需要干燥4 h;选取2%的黏土作无机黏结剂,型煤质量要高于膨润土黏结剂,经济成本更低。The use of dry high-pressure(15-20 MPa)roller forming mechanism for Yankuang pillow shaped coal has problems such as shortened roller skin life cycle,increased maintenance costs,and the inability of pillow shaped coal to be used in automated furnaces.Combining the abundant bituminous coal resources of Yankuang,using 0-3 mm bituminous coal as raw material and vacuum extrusion molding technology,the round rod shaped coal is prepared using wet forming method.The influence of particle size ratio,forming pressure and moisture,drying time,and binder on the forming quality of round rod shaped coal is studied,providing parameter guidance for equipment selection in pilot systems and industrial coal production line design.The results show that the particle size of fine coal after two crushing operations using a two-stage hammer breaking equipment can reach a tightly packed state,with a particle size of 1-3 mm accounting for 65%;The extrusion pressure is negatively correlated with the moisture content of the material.The normal molding pressure is 3-5 MPa,and the required amount of external water is calculated based on 25%of the molding moisture content in the production line;Set the boundary conditions of the drying theory formula to provide a basis for calculating the drying time at different drying temperatures.Using a mesh belt dryer,it is necessary to dry for 4 hours at a drying temperature of 130℃;Selecting 2%clay as an inorganic binder results in a higher quality of briquette than bentonite binder,resulting in lower economic costs.

关 键 词：真空挤压 圆棒型煤 挤出压力 干燥 黏结剂 

分 类 号：TQ536[化学工程—煤化学工程]