冷压型煤替代入高炉焦炭的试验研究

Experimental study on substitution of cold briquette for blast furnace coke

摘要:

以肥煤、无烟煤为原料，有机高分子化合物为粘结剂制备低温固化型煤，考察了粘结剂添加量对肥煤、无烟煤和肥煤+无烟煤型煤的冷压强度、反应性（CRI）及反应后强度（CSR）影响，同时分析了在180~900 ℃过程中型煤抗压强度及灰分的变化．结果表明：粘结剂含量增加能明显提高型煤的冷压强度和CSR，当粘结剂含量大于13%时三种型煤的冷压强度均高于1800 N，满足了储运及入炉要求，反应后强度均超过55%达到一级焦的CSR标准；肥煤型煤的CRI大于36%、无烟煤型煤CRI低于30%、肥煤+无烟煤型煤的CRI为30~32%，均符合二级焦的CRI要求；肥煤型煤在500 ℃附近软化熔融，不能加入高炉使用；粘结剂占比大于14.5%时，肥煤+无烟煤型煤的抗压强度和CSR高于无烟煤型煤，综合性能最好；三种型煤的挥发份高达10~30%，灰份始终低于12%，达到一级焦的灰份标准；无烟煤型煤的硫份低于0.6%，肥煤型煤和肥煤+无烟煤型煤的硫份在0.6~0.8%之间，满足了二级焦炭的硫分标准．

Abstract:

Low temperature solidified briquette was prepared with fat coal and anthracite as raw materials and organic polymer as binder. The effects of binder content on cold compressive strength, reactivity (CRI) and post reaction strength (CSR) of briquette were investigated. The changes of compressive strength and ash content of briquette during 180-900 ℃ were analyzed. The results show that: the increase of binder content can significantly improve the cold compressive strength and CSR of briquettes. When the binder content is more than 13%, the cold compressive strength of three briquettes is higher than 1800n, which meets the requirements of storage, transportation and charging. The strength after reaction is more than 55%, which meets the CSR standard of grade I coke; the CRI of fat coal briquette is more than 36%, the CRI of anthracite briquette is lower than 30%, and the CRI of fat coal+anthracite briquette is 30-32% The results show that the briquette of fat coal softens and melts at 500 ℃ and cannot be used in blast furnace; when the binder proportion is more than 14.5%, the compressive strength and CSR of fat coal+anthracite briquette are higher than that of anthracite briquette, and the comprehensive performance is the best; the volatile matter of three briquettes is as high as 10-30%, and the ash content is always lower than 12%, which meets the ash standard of grade I coke; the sulfur content of anthracite briquette is lower than 0.6%, and the comprehensive performance is the best The sulfur content of coal briquette and fat coal+anthracite briquette ranged from 0.6% to 0.8%, which met the sulfur standard of secondary coke.