SU1270491A1 - Method of burning gaseous fuel - Google Patents

Abstract

THE METHOD OF COMBUSTION OF GAS FUEL by supplying air by a swirling flow and introducing along its axis a part of the fuel mixed with ballast at a given concentration of the latter, and on the periphery the rest of the fuel in the form of radial jets, which in order to reduce the concentration of nitrogen oxides in products of combustion, part of the fuel injected in the form of radial jets, are pre-mixed with baghshast, the concentration of which is maintained equal to the concentration of ballast mixed with part of the fuel introduced along the air flow axis.

Description

 x

(/)

R

 at

to

about

t The invention relates to energy and can be used in boiler units. The aim of the invention is to reduce the concentration of nitrogen oxides in combustion products. The drawing shows the scheme of the proposed method. Along the axis of the swirling air flow 1, a portion of the ballast 2 and part of the gaseous fuel 3 are formed, forming mixture 4. The peripheral zone of the swirling air flow 5 by the radial jets 6 serves the remaining part of the fuel 7 mixed with the ballast 8 whose concentration is equal to the concentration of the ballast mixed with gaseous fuel supplied (m along the axis of the air flow. In this case, all the fuel is pre-mixed

with all the ballast.

Any inert agent (e.g., recirculation gases, steam) can be used as a ballast.

EXAMPLE Natural gas at a flow rate of 0.07 is fed by radial jets to the peripheral zone of a swirling air flow having a flow rate of 1.5, the axis of which serves a mixture of recycle gas in the amount of 0.08 and natural gas jB number of 0.08. A natural gas flow 5 directed by radial jets is premixed with a recycle gas stream (0.07 m- / h). The total recycle gas flow rate is 0.15, which corresponds to a recycle rate of 10%. The concentration of recirculation gases in axial and radial fuel is equal to

in radial from 1 m / m causes an increase in the concentration of nitrogen oxides.

The minimum yield of nitrogen oxides corresponds to the equality of concentrations of ballast in the axial; radial flow of fuel. For this, this is at 1 mz / m.

Thus, the supply of gaseous fuel radial in a mixture with ballast causes a decrease in the formation of nitrogen oxide at any concentrations of ballast in the axial and radial flows.

the indicated concentration (C (, Cp) is optimal and corresponds to the minimum yield of nitrogen oxides,

Completion of nitrogen oxides output according to the proposed method (ECU with respect to 1 m- / m. The concentration of nitrogen oxides in this case is 69 mg / m-. At a given flow rate of recirculation, they are fed into the fuel supplied by radial jets air causes a decrease in the formation of nitrogen oxides, at any concentrations of recirculation gases in two fuel streams. With an increase in the concentration of gases, recirculation in the fuel fed along the axis of the burner (C) is from 0.25 to 1 and its corresponding decrease ra, social jets. (Wed) e t 1e9 to 1, the concentration of nitrogen oxides in combustion products decreases, a further increase in the concentration of recirculation gases in axial fuel and a corresponding decrease in its prototype with an equal degree of recirculation (10%) is 27%.

Claims (1)

METHOD FOR COMBUSING GAS-FUEL FUEL by supplying air with a swirling flow and introducing along its axis part of the fuel mixed with ballast at a given concentration of the latter, and at the periphery - the rest of the fuel in the form of radial jets, (characterized in that, in order to reduce the concentration of nitrogen oxides in combustion products, part of the fuel introduced in the form of radial jets is pre-mixed with ballast, the concentration of which is maintained equal to the concentration of ballast in the mixture with part of the fuel introduced along the axis of the air flow. SU_ <·., 1270491