Abstract
The increase in demand for fuel oil has brought higher challenges to the high value-added process of heavy oil vacuum residue, especially for delayed coking units. For optimization of product distribution, the effects of reaction temperature and chemical additives were discussed. The results show that high temperature and 1 wt% of the heteropoly acid (HPA) could increase the light oil yield in the experimental delayed coking simulation device.
Highlights
With the increase in the global heavy oil resources exploitation and the market growth in demand for light fuel oil, the high value-added technologies of heavy oil residues are attracting more attention in oil refineries [1]
3.1 Influence of temperature on product distribution under non-additive condition The delayed coking simulation experiments were conducted at 440 °C, 460 °C, 480 °C, 500 °C, 520 °C, respectively, to investigate the influence of temperature on the product distribution
3.2 Influence of HPA additives on product distribution The heteropoly acid (HPA) was selected as the additives to investigate its influence on the vacuum residue coking experiment
Summary
With the increase in the global heavy oil resources exploitation and the market growth in demand for light fuel oil, the high value-added technologies of heavy oil residues are attracting more attention in oil refineries [1]. Delayed coking is a classic process to produce high value-added products, which could convert the heavy oil vacuum residue to gasoline, diesel and coke etc. In the delayed coking process, the feedstock is heated to about 500 °C in less than half of one minute, and piped to the coke drum for thermal cracking reaction. It is a non-catalytic reaction unit of which the product yield and quality all depend on operating conditions, which presents limitations in flexible control of product distribution. Chemical additives have drawn great attention to further optimize product distribution to produce more high value-added light oil [5,6,7]. The HPA, the selected additives, was investigated to discuss its influence on the product distribution of the delayed coking experimental device
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