煤泥对石油焦成浆性的影响研究

Influence of coal slime on slurry forming ability of petroleum coke

为减轻煤泥和高硫石油焦两种工业副产品对环境的危害,利用水煤浆气化工艺将其资源化利用,以亚甲基双萘磺酸钠(NNO)作为制浆用分散剂与石油焦混合制浆,考察了煤泥添加量对石油焦的成浆浓度、流变性和稳定性的影响。试验结果表明:石油焦具有较好的成浆性,分散剂NNO添加量为干基石油焦质量的0.8%时,石油焦的定黏浓度为67.63%;当煤泥添加量提高到20%时,可制备出定粘浓度68.15%的浆体,浆体由胀塑性转变为假塑性流体,表现出剪切变稀的特性,7d后的析水率仅为4.11%,小于未添加煤泥时的6.56%,煤泥的添加改善了浆体的流变性,提高了浆体的稳定性,有利于浆体的贮存和运输。

Two industrial by-products,coal slime and high-sulfur petroleum coke,were utilized in the coal-water slurry gasification to reduce the environmental pollution. Methylene perylene naphthalene sulfonate( NNO) was used as a system. The dispersant for pulp was mixed with petroleum coke for slurry preparation,and the influence of the amount of coal slime addition on the slurry concentration,rheology and stability of petroleum coke was investigated. The test results show that petroleum coke has good slurry forming ability. When the amount of dispersant NNO added is 0. 8% of the dry base petroleum coke mass,the fixed viscosity concentration of petroleum coke is 67. 63%;when the amount of slime is increased to 20%,the constant viscosity of slurry is 68. 15%,the slurry changes from swelling plasticity to pseudoplastic fluid,showing shear thinning characteristics. The water release rate after 7 days is only 4. 11%,less than that without slime. The addition of slime improves the rheology,improves the stability,and facilitates the storage and transportation of the slurry.