SU1250775A1 - Pulverized-coal burner - Google Patents

Description

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The invention relates to a power system and can be used in devices for burning solid fuel in a pulverized state.

The aim of the invention is to increase reliability by adjusting the time at which dust starts to ignite and the position of the flare,

In Fig.1 schematically shows a burner, a longitudinal section; 2, the movable part of the splitter for the case of axial movement (the structure is symmetrical with respect to both axes); in FIG. 3, the same, for the case of movement around the axis (the structure has a shape symmetrical with respect to one axis, for example, an ellipse) ; in FIG. A, a nozzle structure for moving around an axis (the structure has different cylinder-forming lengths, for example, a stepwise half-diameter diameter).

The burner contains an air duct I and a dust supply pipe 2, equipped with an outlet movable nozzle 3 and a divider, which is made of fixed and movable parts A and 5. The movable part 5 is installed with the possibility of rotation, axial or screw movement. The movable part 5 of the dissector can be installed with a radial clearance 6 relative to its fixed part 4

The burner works as follows.

Depending on the properties of the fuel, the design of the movable parts of the burner (3 and 5) may be in different versions, for example for axial movement, for lateral movement.

In the design of the burner with the axial movement of the moving parts, the movable part 5 of the chopper moves along the guides that hold the fixed part 4, and the nozzles 3 move along the pipe 2. In this case, the inner diameter of the movable part 5 of the chopper by an amount chosen empirically depending on the reaction properties of the fuel. The nozzles 3 are made with a gap relative to the pipe 2, which is sufficient for free movement, and is a cylinder.

With the design of the burner with the transverse movement of moving parts, the latter have an asymmetrical shape, the length of the movable part 5 of the dissector along one and the axes of symmetry is greater than along the other. The nozzles 3 have different lengths forming the cylinder (an example with a step length is shown in FIG. 4 for adjusting the position of the torch up and down). Clearances are selected in the same way as in the previous case.

When coal burner is in operation, the flow of coal coal comes from pipe 2 with a movable nozzle 3 to a duct 1, where it is mixed with air. The overheated mixture is dispensed by the divider and fed to the combustion chamber. When the load decreases, the moving part 5 of the dissector moves forward and is aligned with the fixed part 4. This increases the area of the base of the splitter and increases the amount of gases sucked to the mouth of the burner. When reducing the load, the nozzles 3 move away from the chopper, the speed of dust and gas mixture decreases, the warming-up time increases. When lateral movement of parts, you can pick up the rotation of the moving part 5 of the chopper so that the torch will not touch the screens other requirements Screw movement of parts is possible to simultaneously adjust the position of the torch and the time at which dust starts to ignite.

The design described corresponds to the supply of dust with a high concentration, since the dimensions of the dust-collecting pipe 2 are small and therefore the effort to move the moving parts will be small.

For difficult reaction properties of fuel, it is advisable to move the moving parts axially, for the properties of fuel for slaughterhouse or for maneuvering boilers it is advisable to move around the axis.

Thus, the use of the proposed burner makes it possible to increase the reliability of the boiler unit operation by adjusting the time at which dust starts to ignite and the position of the flare.

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Editor Y. Sereda

Order 4393/31 Circulation 514 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035

Production and printing company, Uzhgorod, Projecto st., 4

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Compiled by L. Bulynko

Tehred N. Bonkapo Proofreader V. Sitschka

Claims (2)

1. A DUST-BURNER burner, containing an air box and a dust-feeding pipe, equipped with an output movable nozzle and a diffuser, characterized in that, in order to increase reliability by adjusting the start time of dust ignition and the position of the torch, the divider is made up of fixed and movable parts, the last of which are installed with the possibility of rotation, axial and screw movement. 2. The burner according to claim 1, characterized in that the movable part of the divider is installed with a radial clearance relative to its fixed part. SU „„ 1250775 Fig. 1)