Combined type multi-injector burner

Abstract

The invention provides a combined type multi-injector burner with a flammable powder body, which comprises an igniter burner positioned at the center of the burner and a plurality of process combustion nozzles which are evenly formed on the periphery of the igniter burner in the circumferential direction, wherein, each process combustion nozzle comprises a coal dust passage positioned at the center of each process combustion nozzle and a first annular oxidizer passage arranged outside the coal dust passage. In the combined type multi-injector burner, a plurality of process combustion nozzles and the igniter burner are assembled together, the structure is compact, and the combustion efficiency as well as the gasification efficiency are increased; the maintenance of each single process combustion nozzle is flexible, and the disassembly and the assembly are convenient; the process combustion nozzles can limberly adjust the load of the burner, mediums in a hearth can be mixed evenly through repeated impacts, the flame fullness degree is good, and a uniform multilayer cooling structure can protect the burner effectively and prolong the service life of the burner.

Description

technical field [0001] The invention relates to a burner, in particular to a combined multi-nozzle burner which is used in a gasification furnace and a heating furnace and uses combustible powder as fuel. Background technique [0002] Among the existing coal gasification technologies, the technologies of Texaco and Shell are relatively mature and widely used in China, and both have their own characteristics in burner design. [0003] 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) When the high-speed coal-water slurry flows, there is strong wear on the nozzle, so the wearing parts must be replaced frequently (the life of the wearing parts is generally 30-60 days) (2) Th...

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Problems solved by technology

The burner with this structure is very mature, but it also has its own shortcomings: (1) When the high-speed coal-water slurry flows, there is strong wear on the nozzle, so the wearing parts must be replaced frequently (the life of the wearing parts is generally 30-60 days) (2) The direct current structure of coal water slurry and oxygen makes 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 easily damaged during disassembly; (4) The burner The ignition method uses the preheating burner to heat the refractory bricks in the furnace body, and switches after the furnace temperature reaches the combustion temperature of the coal-water slurry. The ignition method is cumbersome to ignite the coal-water slurry; (5) This structure requires that the coal can be made into a high-density , high stability, and good rheological properties of coal-water slurry, coal is required 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 It is not suitable for making coal water slurry, and the scope of application is limited

The disadvantages of the Shell burner are: (1) The installation accuracy of the four sets of burners is very high; (2) There is no ignition device itself, and an additional ignition device must be added in the gasifier for ignition; (3) The coal powder of the Shell burner The mixing process with oxygen is mainly realized by the hedging structure in the furnace, and a single burner cannot work alone, so the shell burner has a small application range and is only suitable for the furnace body with the flame hedging structure

However, this burner adopts an integral design, which is inconvenient to disassemble and maintain

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