RU2853U1 - TWO-STAGE FUEL COMBUSTION BURNER - Google Patents

Abstract

A two-stage combustion burner comprising an air housing, a liquid nozzle with a spray head located in a self-contained burner tunnel, a pipe for supplying gas to an annular chamber arranged concentrically from the outside of the air housing having gas outlets and connected to the mixing chamber, characterized in that gas outlets are located at an acute angle to the longitudinal axis of the burner, comprising 30 - 35, and are directed inside the mixing chamber.

Description

MINER DUAL STAGE FUEL BURNING

The utility model relates to burners for separate and combined burning of liquid and gaseous fuels with a minimum yield of toxic and carcinogenic substances in the combustion products of industrial furnaces and boiler units.

Known burner device for two-stage combustion of gaseous and liquid fuels (see US patent -4029462, N. Cl, 43I-II4, 1977), comprising a housing, a gas manifold with gas holes, are measured: -, in the cavity of the housing along the periphery of the burner tunnel, a fluid nozzle, the spraying head of which is located in an autonomous burner tunnel, a pipe for supplying air.

A disadvantage of the known gas-oil burner is the low efficiency of co-burning liquid and gaseous fuels due to the poor location of the outlet openings of the gas burner in its housing along the periphery of an autonomous burner tunnel, i.e. gas jets go directly to the exit zone of the sawn droplets of liquid fuel and violate the conditions for the droplets to evaporate and mix them with air, as well as coking and burning of gas holes.

Closest to the claimed utility model is a gas-oil burner for two-stage fuel combustion, containing an air casing, a liquid nozzle, a sawing torch of which is located in a self-contained burner tunnel, a pipe for supplying gas to the annular chamber, a mixing chamber with gas outlets connected to the annular gas chamber placed concentrically from the outside of the housing, and the direction of gas jets toward the air and liquid fuel flows is mutually perpendicular (see V. Ya. Gilod Fuel oil burning in metallurgical furnaces, M, Metallurgy, 1973, p. 244, Fig. 95). In the specified device, two-stage combustion of gaseous to -: liquid fuel is carried out. Gaseous fuel enters the combustion zone through the nozzle through the annular chamber, and liquid fuel (fuel oil) - through -: sydney nozzle. The combustion air is divided into primary and secondary in the burner air housing.

-.3 - & f / 0Z Ґ00 /

MKI R 23D 17/00

The disadvantage of this device is that the burner design does not allow to gaseous and liquid fuels to co-burn due to the negative interaction of the liquid fuel stream and gas jets, which deforms the torch and leads to the formation of products of chemical underburning of fuel (carbon monoxide, soot particles, polycyclic aromatic hydrocarbons). In addition, the conditions for mixing gas jets with air flow are also unsatisfactory due to the direction of movement of gas jets and air at right angles, which reduces the efficiency of fuel combustion.

The objective of the proposed utility model is to increase the efficiency of co-combustion of liquid and gaseous fuels while reducing the toxicity of combustion products by arranging gas outlets to the longitudinal axis of the burner at an angle of 30-35 °.

Comparative analysis with the prototype showed that the proposed device differs from the prototype in the presence of gas-emitting holes located pop, sharp ulle to the longitudinal axis of the burner, which meets the criterion of novelty.

Known dust and gas burner (AS 676818, MKI Ј 23DG7 / 00) publ. 1979), in which gas outlets are installed at an angle of 30-4D0 to the axis of the burner. However, gas jets exit the nozzles without mixing with each other, which reduces the quality of the combustion process due to the low efficiency of mixture formation. In addition, the gas extraction nozzles and the head of the fuel oil nozzle are located at the same level, which reduces the reliability of the burner due to coking of the gas-emitting nozzles.

The specified set of essential features allows to increase the efficiency of co-combustion of liquid and gaseous fuels.

In the proposed two-stage combustion burner comprising an air housing, a liquid nozzle, the spray head of which is located in a self-contained burner tunnel, a pipe for supplying gas to an annular chamber mounted concentrically on the outside of the air housing having gas outlets and connected to the mixing chamber, the holes are located at an angle to the longitudinal axis of the burner, comprising 30-35 °, and are directed inside the mixing chamber ;, which eliminates the negative action of gas jets on the formation of a fuel oil torch and thereby

stability of burning liquid fuel is ensured when it is co-combusted with gas ..

The invention is illustrated by the drawing (figure 1) which schematically shows in longitudinal section a gas-oil burner for two-stage combustion of fuel.

The gas-oil burner (Fig. 1) contains an air casing I, a liquid nozzle 2 with a saw head 3, an autonomous burner tunnel 4, a gas supply pipe 5, an annular chamber b and a mixing chamber 7, gas outlets 8 connected to the annular gas chamber b, which are located under angle of 30-35 ° to the longitudinal axis of the burner.

The burner operates as follows. Air is supplied to the space of the air casing I, where it is divided into primary and secondary. Primary air is supplied to the combustion zone of liquid fuel into an autonomous burner tunnel 4, and secondary air is supplied via a peripheral concentric hole to the combustion zone of gaseous fuel. Gaseous fuel enters through the pipe 5 into the annular chamber b through the gas outlet of the combustion hole 8. Moreover, the gas-air flows are mixed at an angle of 30-35 °. Liquid fuel enters the liquid nozzle 2, in which, with the help of the head 3, it is sprayed and ignited in the burner tunnel 4. A peculiarity of the organization of the joint combustion of gas and fuel oil in the proposed burner is that the liquid and gaseous fuel are supplied in separate streams, and both flows are burned in separate zones, and their combustion products are mixed in the chamber 7, taken out in the furnace volume of the unit.

The above specified range of the angle of inclination of the gas outlets to the longitudinal axis of the burner is justified by the results of computational and experimental studies on mixture formation in the proposed burner, as well as on the toxicity of fuel combustion products. The results of computational studies carried out by the method of A.S. Yesserlin Fundamentals of burning gas fuel L, Nedra, 1987; are summarized in table. I.

From the table. I it can be seen that # and наиболее are most comparable and close at an angle of attack of gas jets e (30 - 35 °, i.e. at this angle the best conditions are provided for mixing gas with air.

5 3fSO + Y00

Mixture formation in burners with peripheral gas distribution into a satellite / s / 0 ° / and transverse / o / 0 ° / air flow at various angles of attack o /

The magnitude of the angle The coefficient of inclination of the gas- ™ $ ЖЖЈХ «о w giving holes to the axis of the burner / f

0% US Patent No. 4029462 /

20 - 25 °

30-35 °

40 - 45 °

90 ° / prototype / see V.Ya. Gshyud, p. 244 fig. 95

Table I

Coefficient - Depth Coefficient of penetration of the client -fill PM PM) T

29 29 29 29 29

0.85

17.5

0.3

0.86 29.9 0.4

0.90 76.8 0.77

3.0 95 1.0

4,5

The output of toxic and carcinogenic substances in the combustion products during the joint combustion of gaseous and

Name

Eens / a / pyrene, mcg / 1SSm ° 1C - 12

table 2

liquid fuel

Component concentration

in combustion products, mg / m

8 - 1C

As can be seen from the table. 2, the toxicity of the combustion products of opposed burners is several times higher than the toxicity of the flue gases of the inventive burner, which indicates a low efficiency of co-burning of fuels in known burners due to poor mixture formation.

Using the proposed burner provides the following advantages:

-improves the process of mixing, and therefore, increases the efficiency of the joint combustion of gaseous and liquid fuels;

- provides a decrease in the concentration of harmful substances in the combustion products in comparison with the prototype;

carbon monoxide with an ICO of mg / m3 to 5C mg / m3, i.e. 2 times; capy particles from 40 bm / m3 to 20 mg / m °, i.e. 2 times;

carcinogenic substances ± 0 μg / ICO m ° to I 4- about μg / 100 m, more than 2 times.

- the efficiency of the industrial furnace of the boiler increases due to a decrease in the chemical inexpensiveness of fuel during gas combustion

and fuel oil.

/ 1

eW

- / V.D.Katin I.G. Kiselev

S.V. Elizarov

Claims (1)

A two-stage fuel burner comprising an air housing, a liquid nozzle with a spray head located in an autonomous burner tunnel, a pipe for supplying gas to an annular chamber arranged concentrically from the outside of the air housing having gas outlets and connected to the mixing chamber, characterized in that gas outlets are located at an acute angle to the longitudinal axis of the burner, comprising 30 - 35 ^o , and are directed inside the mixing chamber.