Effects of pH on rheological characteristics and stability of petroleum coke water slurry

Fu-Yan Gao,Eric-J. Hu

doi:10.1007/s12182-016-0118-1

Fu-Yan Gao, Eric-J. Hu

Open Access

https://doi.org/10.1007/s12182-016-0118-1

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Abstract

In this study, the effects of pH on slurrying properties of petroleum coke water slurry (PCWS) were investigated. The slurrying concentration, rheological characteristics and stability of PCWS were studied with four different types of additives at pH varying from 5 to 11. The results showed that the slurrying concentration, rheological characteristics and stability of PCWS all increased at first and then decreased with increasing pH from 5 to 11, and a pH of around 9 was found to be the most favorable acid–alkali environment to all these three slurrying properties. It was also indicated that only in a moderate alkaline environment can the additives be active enough to react with particle surfaces sufficiently to obtain good slurrying concentration and form a stable three-dimensional network structure, which can support strong pseudoplastic characteristics and good stability. An acid environment was a very unfavorable factor to the slurrying properties of PCWS.

Highlights

Petroleum oil and its products are important fuels and chemical raw materials, which are widely used in almost all aspects of production and life
The results showed that the slurrying concentration, rheological characteristics and stability of petroleum coke water slurry (PCWS) all increased at first and decreased with increasing pH from 5 to 11, and a pH of around 9 was found to be the most favorable acid–alkali environment to all these three slurrying properties
The reason is that the additives themselves possess moderate alkalinity, Slurrying concentration of PCWS, wt%

Summary

Introduction

Petroleum oil and its products are important fuels and chemical raw materials, which are widely used in almost all aspects of production and life. With the development of coal water slurry (CWS) technology, increasing attention has been paid to petroleum coke water slurry (PCWS). CWS and PCWS are liquid fuels of low pollution and high efficiency and can be pumped like oil by pipeline and burned in power plants as an oil substitute (Zhan et al 2010). They change the traditional combustion of solid fuels and show huge environmental protection and energy-saving advantages (Cen et al 1997; Wu et al 2015). PCWS has become an important way to utilize petroleum coke efficiently and cleanly

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Conclusion