Abstract
Because of high ignition temperature of low-volatile coal, it brings great difficulties to apply the tiny-oil ignition technology in the fire-up process of a low-volatile coal-fired boiler. To save oil consumed, the tiny-oil ignition technology with pure oxygen for combustion-supporting was developed and was applied in a 670 MWe utility lean coal-fired boiler. This paper focused on the practical application of the technology. The test results indicated that the lean coal was ignited successfully, with flame temperatures nearly 300°C increasing and the carbon contents of fly ash 10∼20% (absolute value) decreasing due to feeding small amount of pure oxygen into a tiny-oil ignition burner. Using the tiny-oil ignition technology with pure oxygen for combustion-supporting could be beneficial to saving about 80% fuel oil in the fire-up process, which demonstrated excellent practical results of the technology.
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