煅后焦外观粒度和光泽不同对性能指标的影响

2021-12-13 10:04:50王冉崔刚
科技研究·理论版 2021年9期

王冉 崔刚

摘要:研究了石油焦煅烧后煅后焦粒度不同和煅烧过程中形成热解炭膜的光泽不同对煅后焦性能指标的影响。本文着重对12~50mm、5~12mm、1~5mm和0~1mm四种原始粒度煅后焦的真密度和粉末比电阻测定,同时对热解炭膜光泽不同煅后焦的振实密度、抗氧化性和沥青浸润率的测定,验证了煅后焦粒度不同和热解炭膜光泽不同对煅后焦各项性能指标的影响。

关键词:煅后焦;粒度;热解炭膜;性能指标

Abstract: The effects of different particle size of calcined coke and different luster of pyrolytic carbon film formed during calcination on the performance index of calcined coke were studied. In this paper, the true density and specific resistance of calcined coke with original particle size of 12 ~ 50mm, 5 ~ 12mm, 1 ~ 5mm and 0 ~ 1mm were measured, and the vibration density, oxidation resistance and pitch infiltration rate of calcined coke with different luster of pyrolytic carbon film were measured, the effects of different particle size of calcined coke and different luster of pyrolytic carbon film on various performance indexes of calcined coke were verified.

Key words: Calcined coke; particle Size; pyrolytic carbon membrane; performance index

煅后焦是石油焦在隔绝空气的条件下进行高温(1050-1350℃)热处理,排除石油焦中的水分和挥发分,提高石油焦的密度、机械强度、导电性和抗氧化性等一系列物理化学变化后的产品。煅后焦质量的波動,直接影响混捏、成型和焙烧等工艺,最终影响预焙阳极的各项指标。在煅烧过程中,石油焦由于热解而逸出碳氢化合物(挥发分),当逸出通道不畅通时,会在焦炭颗粒表面和孔壁上热解炭化沉积,使焦炭颗粒产生银灰色光泽(光泽炭)或变黑(炭黑)[1]。

煅后焦不同原始粒度和煅烧过程中形成热解炭膜的光泽不同对煅后焦性能指标影响等方面的研究比较少。本文以32罐8层火道顺流式罐式煅烧炉的中间1组排料为研究对象,火道温度控制参数为:首层1200℃~1280℃,三层1250℃~1350℃,六层1180℃~1250℃,八层1150℃以下。主要验证了在石油焦料源、温度控制和排料速度等相同条件下,煅后焦因原始粒度不同和热解炭膜的光泽不同对煅后焦性能指标(包括真密度、粉末比电阻、振实密度、抗氧化性和沥青浸润率)的影响。……

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