Ignition and low-load stable combustion burner for fluidized bed boiler

Abstract

The invention discloses a burner for ignition and low-load stable combustion of a fluidized bed boiler, and the burner belongs to fluidized bed boiler ignition and low-load stable combustion technologies. The novel burner has the micro-oil ignition or less-oil ignition and low-load stable combustion functions, and mainly aims to achieve cold-state ignition and low-load stable combustion for the fluidized bed boiler. The burner comprises an oil combustor, an oil gun ignition device, a secondary oil combustor, a fire check device, a swirl flow air channel, swirl vanes, a burner convergent section, a burner divergent section, a cooling air channel and a uniform-temperature mixing section. As for design, the ignition device is used for atomizing fuel through high-pressure air firstly, a small amount of fuel is burnt sufficiently in the oil combustor, an oil gun adopts mechanical atomization or air atomization, then the fuel is completely burnt out in the secondary combustor through primary air, and flames are pushed to spray out of the secondary combustor; the swirl vanes enable the primary air in the swirl flow air channel to rotate and be fully mixed with the flames spraying out of the secondary combustor, and the effect of cooling the secondary combustor is realized; and finally, air temperatures are uniformly mixed at the uniform-temperature section.

Description

technical field [0001] The invention belongs to the technical field of combustion, and in particular relates to a fluidized bed boiler start-up ignition and low-load stable combustion burner. Background technique [0002] At present, many power plant boilers in my country use fluidized bed boilers. The start-up of the unit and low-load stable combustion require a large amount of fuel consumption. not effectively resolved. The fuel consumption of fluidized bed boilers with low calorific value coal is very large. A 300MW boiler needs to consume 30-40 tons of diesel oil for each cold start. On the other hand, the original ignition method cannot Putting in dust removal equipment, the environmental protection cannot meet the standard, and even cause the slurry poisoning of the desulfurization tower and affect the normal operation. At present, there are many fluidized bed boilers that use low-calorific-value coals that cannot be ignited with a small amount of oil, resulting in lo...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a fluidized bed boiler ignition and low-load stable combustion burner to solve the problem of fluidized bed boiler cold ignition and low-load stable combustion

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