Based on the improvement of O2/CO2 combustion technology, O2/H2O (oxy?steam) combustion technology has been widely concerned by scholars at home and abroad. Because of its advantages of small system coupling, easy start-up and low concentration of pollutants, it may become the next generation potential oxygen-rich combustion technology. At present, most studies have studied the effect of N2, CO2, and H2O(g) as diluents on the combustion characteristics of methane in single or pairwise comparisons. However, the combustion characteristics of methane in O2/N2, O2/CO2 and O2/H2O atmospheres are rarely analyzed comprehensively. And there are few researches on related applications of O2/H2O combustion technology at home and abroad. In this paper, the combustion characteristics of CH4 and the generation of main pollutants under the three atmospheres of O2/N2, O2/CO2 and O2/H2O were studied. Based on this, a new technology case based on O2/H2O atmosphere combustion and replacement of natural gas hydrates was proposed. The effects of three combustion atmospheres on combustion temperature, combustion rate, generation of pollutants (NOx, Soot), and combustion efficiency of methane were compared and analyzed. Simultaneously, the size of the outlet O2 concentration was taken as a synergistic consideration for pollutant emissions. The results showed that compared with O2/N2 and O2/CO2 atmospheres, the combustion temperature was the lowest, the combustion rate was the highest, the generation of pollutants (NOx, Soot) was the least, the combustion efficiency was the highest, and the export O2 concentration was the lowest under the atmosphere of O2/H2O. Therefore, O2/H2O combustion technology stood out. On this basis, the concentration ratio of O2/H2O matching with the characteristic curve of traditional combustion temperature distribution was determined: 32%O2/68%H2O. Based on the results of the simulation study, a new set of O2/H2O combustion technology and the development of natural gas hydrates co-production process was proposed, which can provide theoretical and technical support for future industrial applications of advanced combustion technology.
Duoduo HU Yindi ZHANG Chang LIU
. Combustion characteristics of CH4 at O2/H2O atmosphere and gas hydrate co-production process[J]. The Chinese Journal of Process Engineering, 2018
, 18(5)
: 1102
-1111
.
DOI: 10.12034/j.issn.1009-606X.218114
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