型煤炭化

CARBONIZATION OF BRIQUETTES

高温发化是把冷压型煤转化为低挥发分和高强度的炼铁和铸造用型焦。炭化试验在可以装2kg型煤的外热式炉内进行。结果表明：（1）在加热速度、炭化终温和终温下的热焖时间三种淡化条件下，加热速度对提高型煤强度最显著；（2）在快速、变速和慢速三种不同加热方式中，变速加热所得型焦强度最高；（3）变速加热由第一（较快速）、第二（极低速）和第三（慢速）三段组成。其中第三段对型焦强度影响最大，第二段对强度的影响较小，可以忽略，因而可并入第三段以简化加热过程；（4）适当提高发化终温或延长终温下的热切时间对改善型焦强度是有利的。

The object of high temperature carbonization is to convert briquettes by cold briquetting into formcokes with low volatile matter and high strength for blast furnace and foundry use. Carbonizing tests were conducted by using external-hea1ed furnace in which 2kg of briquettes can be charged. The main results show: (1) Among three factors which effect on the strength of briquettes, i. e. heating rate (HR), terminal temperature of carbonization (TTC) and soaking time under terminal temperature (STTT), HR is the most remarkable one to raise the strength of briquettes; (2) Among different HR, i. e. rapid heating (RH), variable heating (VH) and slow heating, VH is the best one for getting high strength formcokes; (3) Three are three stages of VH process, i. e. the first (more rapid ), the second (very low) and the third (slow) stages. Among them, the th1rd one is the most important one that influencing strength of final formcokes significantly, and the second one is less relative to the strength, it can be omit- ted. So the second one can be merged into the third one to simplified the heating process. (4) It is profitable for improving the properties of formcokes to raise TTC appropriately or to lengthen some more STTT