Ignition Characteristics of High-temperature Oxygen Generator in a W-flame Boiler

To solve the problem of large oil consumption in cold start-up process of W-flame anthracite-fired boilers, a new ignition technology was proposed with the use of high-temperature oxygen. The specific way is to heat the oxygen to a high temperature with little oil, and then use the high-temperature oxygen to ignite the stream of pulverized anthracite. Hot-state experiments and numerical simulations were implemented to validate the feasibility and effectiveness of the proposed technology. Results show that oxygen can be safely heated to 1450℃ using a high-temperature oxygen generator. In a pure oxygen environment, fuel oil would burn out instantaneously. At the outlet of high-temperature oxygen generator, both the temperature and oxygen mass fraction are uniformly distributed. When the ignition heat power is 700 kW, the flame temperature of pulverized anthracite stream would get up to 1250℃, with the flame length being more than 8 meters.