SU1668816A1 - Hearth burner - Google Patents

Abstract

The invention relates to gas-burning devices and can be used in various technological processes. The purpose of the invention is to reduce the excess air ratio by increasing the intensity of mixing of the working media. In tunnel 1 there are outlet openings of channels 6 communicating with the air inlet duct 4. 3 Cp. Of the valve, 4 sludge.

Description

ff.

n

DL

1

Os

about

00 00

OK

The invention relates to the power industry, in particular, to devices for burning fuel, and can be used in boiler units of small and medium power.

The purpose of the invention is to reduce the air excess factor by intensifying the mixing of the fuel and the oxidant.

FIG. 1 is a schematic diagram of a burner; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. A - node I in FIG. 2

The hearth burner contains a burner tunnel 1, at the outlet to which gas distribution pipes 2 are located. Before the latter, on the side surface of which are holes 3, a distribution grid 5 is installed in the air inlet duct 4. In tunnel 1 there are channels 6 communicating with the air cavity - hopper duct 4. Outlet openings 7 of channels b are located beyond the cross section of gas distribution pipes 2 along the flow of the mixture in the tunnel 1. The number of channels 6 is equal to the number of holes 3 on the gas distributing pipe 2, with the axes of the channels 6 ( knyh holes 7) and the axis holes 3 of the tubes 2 disposed in longitudinal planes gun- nel 1 (m. e. their location hallway). In the zone of the outlet openings 7 of the channels 6 there are protrusions 8 in the flow part of the gun 1, with the protrusions 8 located in front of the outlet openings 7. The height of the protrusions 8 is equal to 0.3 of the width of the tunnel 1.

The burner works as follows.

The air passed through the air distribution grill 5 is divided into two parts. Part of the air (primary) from the air duct 4 enters the tunnel 1. The remaining part of the air (secondary) enters the channels 6. The primary air flow from the gas distribution pipes 2 through

holes 3 system of transverse jets enters the gas. At this stage, part of the fuel is burned out and flame is stabilized. Into the mixture stream of combustion products

and the fuel above the tunnel 1 enters the secondary air. It is also supplied by a system of transverse jets from the openings 7 of the channels 6. Moreover, the arrangement of the openings 3 and 7 determines the flow of this

air in areas where there is an excess of fuel (the depth of tunnel 1). In the absence of significant pressure drops on the openings 7 of the channels 6, the optimal distribution of secondary air across the width

the tunnel is determined by the outflow of air jets behind mechanical screens (projections 8).

Claims (4)

1. Bottom burner containing an air blower duct with installed in it a transverse air distribution grill, above which gas distribution pipes with openings in the side wall are located at the entrance to the burner tunnel, characterized in that, in order to reduce the excess air ratio by intensification of mixing, the tunnel cavity is additionally communicated with the air inlet duct using curved channels. 2. Burner according to claim 1, characterized in that the number of channels is equal to the number of holes in the pipe, with the axes of the outlet openings of the channels and the openings of the pipe in the same plane. 3. Burner on PP. 1 and 2, characterized in that a ledge is made on the wall of the tunnel in the zone of each outlet of the channel. 4. Burner on PP, 1-3, I distinguish schA - so. that the height of the protrusions is 0.3 tunnel width. Schi I 6-6 Schi g