Water-coal slurry gasifier: four nozzles result in a higher combustion efficiency compared to a single nozzle
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In the water-coal slurry gasification process, the ratio of non-methane hydrocarbons in the flue gas exiting the methanol wash tail gas scrubber is several times higher for the single-nozzle burner head compared to that of the four-nozzle burner head, indicating that the four-nozzle burner has a higher combustion efficiency than the single-nozzle one.
Hydrocarbons are likely related to the gasification temperature as well as the properties of the feed coal; however, the four-nozzle design offers a better flow field
A high hydrocarbon content indicates that, due to the temperature distribution gradient, there are areas with relatively lower temperatures where the coking reaction of coal occurs; this process results in the dry distillation of coal. The four-nozzle design improves vaporization efficiency and results in a smaller temperature gradient, thus reducing the amount of hydrocarbons.
A high hydrocarbon content indicates that, due to the temperature distribution gradient, there are areas with relatively lower temperatures where the coking reaction of coal occurs; this process results in the dry distillation of coal. The four-nozzle design improves vaporization efficiency and results in a smaller temperature gradient, thus reducing the amount of hydrocarbons.