粒径分布对水焦浆性质的影响

分析研究了不同粒径分布的石油焦成浆性及制备水焦浆的流变性和稳定性。结果表明,石油焦的成浆性较好,成浆浓度近70%,浆体的表观黏度均随浓度的增大而增大。粒径分布越宽,越有利于堆积,堆积效率越高,可制浆浓度越高,制备水焦浆的最佳药剂量越低,采用萘系分散剂制备的水焦浆呈胀塑性流型,粒径分布越宽,胀塑性越弱,利用静置观察法与Turbiscan Lab稳定性分析仪测定相结合评价水焦浆的稳定性,水焦浆的稳定性差,且粒径越大,析水率越低,沉降区的焦粉颗粒越易发生聚结,底部越易产生硬沉淀,稳定性越差。颗粒聚结是水焦浆稳定性的主要影响因素。

Effect of particle size distribution on the properties of petroleum coke water slurry

The slurryability, rheological characteristics and stability of petroleum coke water slurry (PCWS) with different particle size distribution were studied. The results show that the slurryability of petroleum coke was good, and the solid concentration was about 70%. The apparent viscosity of PCWS increases with the petroleum coke concentration increase. The PCWS with wider particle size distribution has the better close-packing and higher stacked efficiency, which results in the higher solid concentration with fewer dispersants. The PCWS behaves as a dilatant fluid with naphthalene series dispersant. The dilatability decreases with the wide distribution of particle size. The stability of PCWS is evaluated by using standing observation and Turbiscan Lab stability analyzer methods. When the particle size is larger, the stability of PCWS is worse, the drainage rate is lower, and the petroleum coke particle coalescence and hard sedimentation are easy formation. Particle coalescence is the main factor influencing the stability of PCWS.