SU1160175A1 - Burner - Google Patents

Abstract

A TORCH containing coaxially positioned fuel channel and primary and secondary air channels, separated from the secondary air channel by a perforated partition, a recirculation gas feed channel and a swirler, characterized in that in order to reduce the formation of nitrogen oxides and corrosive components, the swirler is located in the channel supplying recirculation gases beyond the perforated section of the partition along the flow of gases, the recirculation gas supply channel and the primary air channel being connected stvom tubes extending through the secondary air passage.

Description

The invention relates to a power system, and can be applied in devices for burning fossil fuels in boiler technology, in metallurgical and process furnaces.

The purpose of the invention is to reduce the formation of nitrogen oxide and corrosion-active components., ./ -,,

FIG. 1 shows go |) tree, view; in fig. 2 - graphlc depending on the relative content of nitrogen oocytes on the fraction of recirculation gases and the point where recirculation gases are introduced into the burner.

The burner contains coaxially arranged fuel channel 1 and channels 2 and 3 of primary and secondary air, separated from channel 3 of secondary air by means of a perforated partition 4, channel 5 for supplying recirculation gases and a swirler 6. Fuel channel 1 has outlet openings 7.

The swirler 6 is located in the recirculation gas supply channel 5 behind the peripheral portion of the partition 4 along the gas flow, and the recirculation gas supply channel 5 and the primary air channel 2 are connected via tubes 8 passing through the secondary air channel.

The burner works as follows.

Fuel into the combustion chamber is fed through channel 1 through openings 7, swirling primary air flow is fed through channel 2, secondary air is fed through channel 3.

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Inert gases are fed through the peripheral annular channel 5, as well as through the holes in the partition 4, located before the swirler 6 along the flow of gases, into the channel 3 of secondary air and through the tubes 8 into the channel 2 of primary air.

The supply of part of the flue gas recirculation to the channels 2 and 3 of the primary and secondary air leads to a decrease in local oxygen concentrations in the initial section and in the flare core and a relatively large decrease in temperature in the flare core, which contributes to a deeper decrease in the nitrogen oxide concentration in the flue gases.

Entering inert gases directly into the burner duct leads to a greater reduction in the formation of nitrogen oxides (Fig. 2, curve I) than when entering them along the peripheral annular channel (Fig. 2, curve II) with the same fraction of recirculation gases, a decrease in local excess air in the initial part and in the flare core and a relatively greater decrease in temperature in the flare core.

The proposed device will reduce the formation of nitrogen oxides at low concentrations of corrosive components near the flue screens and at no additional cost of energy to drive the exhaust fan of recirculation gases when burning the NII of various fuels.

Claims (1)

A BURNER containing coaxially arranged fuel channel and primary and secondary air channels, a recirculation gas supply channel and a swirl separated from the secondary air channel by means of a perforated partition, characterized in that, in order to reduce the formation of nitrogen oxides and corrosive components, the swirl is located in the gas supply channel recirculation behind the perforated section of the partition along the gas stream, and the gas recirculation channel and the primary air channel are connected by cuttings passing through the secondary air passage. FIG. I