Characterization of Chars Obtained from Co-pyrolysis of Coal and Petroleum Residues

Abstract

Co-pyrolysis of coal and petroleum residue has been carried out in a bench scale unit in order to study the influence of the coal nature and the experimental conditions on the characteristics of the char obtained. Two coals of different rank, Samca (sub-bituminous) and Figaredo (bituminous), and a petroleum residue from the Maya crude have been used. Temperatures of 600, 650, and 700 °C, pressures of 0.1, 0.5, and 1 MPa, and mass ratios (Coal/PR) of 70/30 and 50/50 have been studied. A synergistic effect on char yields, which increases as temperature, pressure, and PR/coal ratio increase, is observed for both coals studied. Some relevant char characteristics of sulfur content, reactivity, and coking properties have been analyzed in order to determine a final use for the chars obtained. It is concluded that Samca/PR chars, especially for the 70/30 mixture, could be gasified to produce syn-gas. Coal /PR ratio higher than 50/50, temperature lower than 700 °C, and atmospheric pressure should be used in co-pyrolysis with Samca coal, to keep chars reactive enough to be gasified. Figaredo/PR chars, having a low sulfur content, good optical properties, and a lower reactivity could be used as a coke feedstock.

Effect of carbon type on the performance of a direct or hybrid carbon solid oxide fuel cell

“…Thus, the employment of other types of readily available and cheaper carbons sources, such as biomass, would be highly desirable. In this regard, charcoals derived from biomass, organic wastes or petroleum residues have many advantages as DCFC feedstock, since they are inexpensive, easy to store, available worldwide and highly conductive [20][21][22][23] so they constitute a promising renewable carbon source.…”

Interactions between corncob and lignite during temperature-programmed co-pyrolysis

“…the environment are drivers for the development of large-scale clean energy solutions. Co-utilization of coal with renewable or waste materials such as biomass, petroleum residue, and waste plastic through co-combustion, co-pyrolysis, or co-gasification has received particular attention as a way of increasing the penetration of renewable energy [1][2][3][4][5]. Biomass is one of the most common feedstocks co-fired with coal, and when appropriately sourced and managed, is considered CO 2 neutral and therefore a renewable alternative energy source.…”

Desulfurization of Coal by Pyrolysis and Hydropyrolysis with Addition of KOH/NaOH

“…The peak temperature is that on the burning profile at which the rate of weight loss is maximum. The lower the peak temperature, the more reactive the coal that may be considered. , The burn-out temperature represents the temperature at which sample oxidation is completed. The weight-loss rate at peak temperature is called the “maximum combustion rate”.…”