Powder-combustible vortex burner

Abstract

A vortex burner of combustible micropowder i.e pulverized coal is prepared by setting primary cooling jacket with an ignition device at the centre of it and a flame detection device at jacket top cover ; arranging primary , secondary and tertiary cooling jackets in sequence coaxially as radial outwards to form primary and secondary air channel and cooling channel , tertiary micropowder channel and tertiary channel ; connecting primary air-channel to fuel gas inlet tube and gasifying agent inlet tube after they are combined for switching over two gases by valve ; setting spiral - flow device at secondary air-channel outlet and jetting out pulverized coal in spiral - flow way at its conveying tube outlet.

Description

technical field [0001] The invention relates to a burner, in particular to a swirl burner using combustible powder as fuel for gasification furnaces and heating furnaces. Background technique [0002] Among the existing coal gasification technologies, the technologies of Texaco and Shell are relatively mature and have been applied by many domestic manufacturers. Both have their own characteristics in burner design. Among them, the Texaco gasifier burner uses coal water slurry as fuel. The burner is divided into three layers of channels. The medium of the central channel is oxygen, the medium of the second channel is coal water slurry, and the medium of the outermost channel is still oxygen. The burner with this structure is very mature, but it also has its own shortcomings: (1) The coal water slurry has strong wear on the nozzle, so the wearing parts must be replaced frequently (the life of the wearing parts is generally 30 to 60 days); (2) ) The coal-water slurry and oxyge...

AI Technical Summary

Problems solved by technology

The burner with this structure is very mature, but it also has its own shortcomings: (1) The coal water slurry has strong wear on the nozzle, so the wearing parts must be replaced frequently (the life of the wearing parts is generally 30 to 60 days); (2) ) The coal-water slurry and oxygen adopt a direct-current structure to make the combustion flame longer, and the length of the corresponding furnace body is also increased; (3) The burner uses a coil cooling structure, which is very easy to cause damage during disassembly; (4) The burner ignition method adopts The preheating burner heats the refractory bricks in the furnace body, and switches after the furnace temperature reaches the combustion temperature of the coal-water slurry to ignite the coal-water slurry. Coal water slurry with good rheological properties requires coal to be ground into a coal slurry with a certain particle size distribution. In order to improve the characteristics of the coal water slurry, a certain amount of additives must be added. Even so, there are still some coal types that are not suitable for production. Coal-water slurry, the scope of application is limited

The shortcomings of the Shell burner are: (1) Although the structure is simple, it adopts a direct current structure, and the flame is long, but it does not have an ignition device itself, and an additional ignition device needs to be added in the gasifier for ignition; (2) The coal powder of the Shell burner The mixing process with oxygen is mainly realized by the four-hedge structure in the furnace. Without the swirl structure, a single burner cannot work alone. Therefore, the Shell burner has a small scope of application and is only suitable for furnaces with a flame-hedge structure.

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