Oxidation of Sulphur Dioxide in Air at 950° C: Co-operative Influence of Carbon Monoxide and Nitric Oxide

Shaw, J.T.; Green, P. D.

doi:10.1038/2111171a0

Cited by 4 publications

(1 citation statement)

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“…It is possible that the larger amount of S in the system due to the recycle stream may enhance the formation of sulfates at higher temperatures, a feature also observed for Na 2 SO 4 , K 2 SO 4 , and CaSO 4 . Another factor contributing to this behavior may have been the conversion of SO 2 to SO 3 , which in air-fired boilers is enhanced at higher temperatures by oxygen concentration and at downstream conditions by heterogeneous oxidation on metal surfaces, and is likely to be similarly influenced in oxy-fuel boilers. , The higher concentration of SO 3 predicted in this work will also enhance the formation of the less-volatile trace metal sulfate species…”

Section: Resultsmentioning

confidence: 79%

Comparison of Thermodynamic Equilibrium Predictions on Trace Element Speciation in Oxy-Fuel and Conventional Coal Combustion Power Plants

2014

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The importance of coal as the main energy source has posed the challenge to use this fuel in a sustainable way while new clean energy technologies are developed. Carbon capture and storage is one of the main short-term solutions to the problem of CO 2 emissions and involves a wide range of technologies. Oxy-fuel combustion is one of them, and even though it has emerged as an attractive alternative, a better understanding of the performance of the process is still required. The current work was aimed at enhancing the understanding of the different thermodynamic equilibrium behaviors of metallic trace elements in coal combustion under air and oxy-fuel environments. The effect of coal composition on the speciation of these elements was analyzed, and a sensitivity analysis of the effect of various concentrations of Cl, S and the mineral content of coal was performed. It was found that the increase in the concentration of CO 2 and H 2 O did not have a significant effect on the thermodynamically stable forms of trace element compounds that were predicted to form. The recycling of a larger amount of trace elements did not affect the speciation either but only increased the concentration of trace elements inside the boiler. The speciation and volatility of the species predicted by thermodynamic modeling in the majority of the trace elements considered in this study was found to be sensitive mainly to changes in the concentration of Cl, Ca, S, and Si. In terms of species that may enhance corrosion at tube wall temperatures, the thermodynamic calculations predicted the condensation of the majority of trace elements as sulfates as well as the formation of V 2 O 5 .

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Section: Resultsmentioning

confidence: 79%