Abstract: Coal cakes with dimensions of 500 mm×350 mm×400 mm were prepared using pulverized coal,coke powder,and coal pitch as raw materials,adding 10 mass% of water,and stamp charging.When the furnace temperature was 650 ℃,the coal cakes were placed in single-side heating furnaces,and heated at different heating rates till forming coke,with final coking temperature of 1 050 ℃.The effects of lining materials (clay bricks and silica bricks) and heating rates (0.5,0.6,and 0.7 ℃·h^-1) on the heating rate of the coal cakes and the properties of the formed coke were studied.The results show that due to the better thermal conductivity of silica bricks compared to clay bricks,the coal cakes in the furnace using the silica brick lining have a shorter water vaporization time,and a higher heating rate in the first shrinkage peak stage between 200-600 ℃,which leads to higher internal stress in the coal cakes and a lower coke agglomeration rate.Therefore,when using silica bricks as the wall of coke oven carbonization chambers,the heating rate should be 0.5 ℃·h^-1,while for clay bricks as the wall,the heating rate should be 0.6 ℃·h^-1.

Key words: foundry coke, clay brick, silica brick, heating rate, agglomeration property

摘要： 以煤粉、焦粉和煤沥青为原料,加水10%(w),捣固为500 mm×350 mm×400 mm的煤饼。入炉温度为650 ℃时,将煤饼放入单面加热炉内,炼焦终温为1 050 ℃,在不同的加热速率下焦化为焦炭。研究了炉衬材料(黏土砖和硅砖)和加热速率(0.5、0.6、0.7 ℃·h^-1)对煤饼自身升温速率和焦化后焦炭性能的影响。结果表明:由于硅砖的热导率优于黏土砖的,硅砖炉衬侧煤饼在水分挥发阶段时间较短,并在200~600 ℃煤饼第一收缩峰阶段自身升温速率较大,导致煤饼内部应力较大,焦炭块度较低。焦炉炭化室采用硅砖炉墙时加热速率宜在0.5 ℃·h^-1,黏土砖作为炉墙时加热速率宜在0.6 ℃·h^-1。

关键词: 铸造焦, 黏土砖, 硅砖, 升温速率, 成块性