SU1550275A1 - Coal-dust swirl burner - Google Patents

Abstract

The invention relates to power engineering, in particular, to devices for heating and burning solid fuels, preferably low-reactive solid fuels. The burner contains a high concentration pulverized annular channel 1 connected to the secondary air supply channel 2, muffle 3, secondary air duct 4, channel 5 for the incendiary device located along the axis of the burner. The output 1 of pulverized coal fuel at the outlet is equipped with a movable nozzle 6, a muffle 3, equipped at the outlet with a cone divider 7, is located inside the channel 2 of the primary air supply and connected to the latter by means of air distribution tubes 8 passing through the nozzles 6 and the divider 7, in addition, coaxially inside the channel 1 for supplying pulverized coal there is a gas collector 9 with distribution nozzles 10 inserted into the cavity of the muffle 3, and the length of the muffle 3 is at least three of its diameters. 1 il.

Description

31550

The invention relates to the power industry, in particular, to devices for heating and burning solid fuels, preferably low-reactivity pulverized coal.

The purpose of the invention is to expand the scope and increase operational reliability by high-quality heating of pulverized fuel,

The drawing shows schematically the proposed vortex of pulverized coal-burner, a longitudinal section.

The burner contains an annular coal-feed channel 1 of high concentration, connected to the secondary air supply channel 2, a muffle 3, a secondary air duct 4, a channel 5 for the incendiary device located along the axis of the burner. Channel 1 of the supply of pulverized coal at the outlet is equipped with a movable nozzle 6. The muffle 3, equipped at the outlet with a cone divider 7, is located inside the channel 2 of the primary supply

air and connected to the latter by means of air distribution tubes 8, the passage of cich through the nozzles 6 and the divider 7, In addition, coaxially inside the channel 1 of the supply of pulverized coal is a gas collector 9 with distribution nozzles 10, inserted into the cavity muffle 3, the length of the muffle 3 equal to at least three of its diameters, Muffle 3 is a cylindrical shell, lined with refractory material. Channel 2 of secondary air is equipped with a snail swirler 1I, and air distribution tubes 8 at the outlet are equipped with a blade swirl 12. In addition, the channel 1 for supplying coal-fueled fuel at the inlet is equipped with a mixer 13.

The burner works as follows.

After turning on the blower fan and air from the snail swirler 11 into channel 2 and through the air distribution tubes 8 and swirl 12 into the cavity of muffle 3, gas is supplied through the manifold 9 and distribution nozzles 10 (or fuel oil installed in channel 5), which is ignited the heating device muffle 3 is heated.

pulverized coal is fed through channel 1 from the boiler dust supply system. In the mixer 13, the feed flow is corrected for dust concentration. The exit from channel 1 and nozzle 6, dust flows around the conical divider 7 and mixes with a stream of hot air (250-450 C) coming through channel 2 from the snail swirler 11. heat exchange with the walls of the muffle 3. At the outlet of the muffle 3, within the outlet of the burner embrasure, the gases CO, C02, leaving the muffle, mix with the main stream of pulverized coal. The thermally prepared aerosol at the exit from the burner is mixed at temperatures of 500-700 ° C with a swirling stream of secondary air coming from the box 4, equipped with a snail swirler. When the boiler is operating on fuel oil and gas, a steam mechanical fuel oil injector is installed in channel 5. When this gas supplied through the gas manifold 9, the combustion in the muffle 3, heats the nozzle barrel. In addition, the burner can also be used for dust of normal concentration. In this case, an air mixture from the dust pipe is introduced through the channel 2 of the primary air.

Claims (1)

Invention Formula A vortex pulverized coal burner containing an annular feed channel of pulverized coal of high concentration, connected to the primary air feed channel, a muffle, a secondary air duct, an incendiary device channel located along the burner axis, characterized in that, in order to expand the field of application and increase operational reliability by quality program of pulverized coal, the feed channel of pulverized coal at the exit is equipped with a movable nozzle, the muffle is provided at the inlet with a cone divider, Position the inside of the primary air supply channel and connected to the latter by means of the air distribution tubes passing through the distributor nozzles and, moreover, coaxially inside 515502756 The channel for supplying the pulverized fuel to the muffle cavity, while the length of the gas manifold located around the diffuser is at least three of its diameter nozzles, set up.