JPS62225807A - Burner - Google Patents

Abstract

PURPOSE:To provide a burner which is capable of reducing formation of NOx by forming a projection cylinder at the upper central section of a burner main body and making the combustion of gasified kerosene which has been premixed with a primary air at a first gas jetting-out opening and the combustion of pre-mixed gasified kerosene which has been diluted by diluting air from side holes on the whole circumference of a burner cap coexist. CONSTITUTION:The upper body 13 of a burner is surrounded by a burner cap 8, and air flows in through a plurality of air intake holes 9 provided on the whole circumference on the side face of the burner cap 8 to dilute a fuel gas that jets out after passing through a second gas jetting-out opening 6 provided on the upper face of bottom face of a projecting cylinder 4. Ignition is made to a fuel that jets out from a first gas jetting-out opening 5 provided on the bottom face of the projecting cylinder 4 and is not diluted. With this burning flame a fuel gas that jets out from a second gas jetting-out opening 6 and is diluted by a primary air C at an air intake opening 9 contacts and the fuel gas burns. The combustion of gasified kerosene which was premixed with the primary air at the first gas jetting-out opening 5 and the combustion of gasified kerosene that was premixed with the primary air inside the burner main body 2 and that was further diluted by the air from the side face holes on the whole circumference of the burner cap 8 are made to coexist. Accordingly formation of NOx is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a combustion device such as a petroleum 7 anheater, and particularly relates to an improvement of a Bunsen combustion burner.

<Prior Art> Conventionally, this type of burner has a suction port for sucking vaporized fuel gas and primary air formed in the lower part of the burner main body, and a gas ejection port formed in the upper surface of the burner main body.

In the above configuration, fuel gas premixed with primary air inside the burner is ejected from the gas jet port and combusted.

However, since the combustion rate is relatively slow, the combustion constituent gas (02-N2-CO2, etc.) remains in the high-temperature atmosphere for a long time, making it easier to generate NOx.

<Objective> In view of the above, an object of the present invention is to provide a combustion device that can reduce the generation of NOx.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. The combustion apparatus according to the present invention has vaporized fuel in the lower part of the burner body 2 of the burner 1 disposed in the combustion furnace. A suction port 3 for sucking gas B and primary air C is formed, a protruding cylinder 4 is formed at the center of the upper part of the burner body 2, and a first gas jetting hole 5 is formed on the upper surface of the projecting cylinder 4, A second gas outlet 6 is formed at the outer periphery of the protruding cylinder 4 at the upper part of the burner wood 2, and a burner cap 8 with a flame lower is fitted onto the upper part of the burner body 2, and the outer periphery of the burner cap 8 A dilution air intake hole 9 for introducing primary air C is formed in the part.

The burner body 2 includes a burner bottom body 12 having a semicircular arc cross section;
A base upper body 13 having a substantially semicircular arc cross section, and the burner bottom body 12
The burner bottom body 12 and the outer ends of the partition plate 14 are caulked and fixed integrally by the lower end outer periphery 7 flange 15 of the burner upper body 13. It is.

The suction port 3 is formed at the end of the burner bottom body 12 by the partition plate 14 and the burner bottom body 12, and is arranged close to a nozzle 16 from which fuel vaporized by the vaporizer is spouted. There is.

A mixing chamber 17 in which fuel gas B and primary air C are mixed is formed by the partition plate 14 and the burner bottom body 12. The fuel gas B ejected from the nozzle 16 and entering the burner tree 12 from the suction port 3 is also sucked in from the suction port 3 and mixed with the primary air C in the mixing chamber 17 to form a premixed gas. Ru. A hole 18 is formed in the partition plate 14 to guide the premixed gas to the burner upper body 13 side.

The burner upper body 13 is formed in a vertical cross section with an open-bottom F-shape, and the projecting tube 4 is formed at the center of the upper surface of the burner upper body 13 with a cross-section in a F-shape with an open bottom. The first gas outlet 5 has a substantially rectangular shape in plan view, and a combustion net 19A is attached to the first gas outlet 5. Further, the second gas outlet 6 is formed in an annular shape all around the upper surface of the burner upper body 13, and a combustion net 19B is attached to the second gas outlet 6. The burner cap 8 is formed in a reverse forest shape, and the flame lower is formed on the upper surface thereof. The lower end of the burner cap 8 has a vertical surface 8A, and the air intake hole 9 is formed in the vertical surface 8A in substantially the same plane as the second gas outlet 6. Then, the lower end portion of the burner cap 8 is fitted to the outer periphery of the lower end of the burner upper body 13.

The first gas outlet 5 of the burner upper body 13 is arranged directly below the flame lower of the burner cap 8, and the flame lower is formed to have a larger diameter than the first gas outlet 5. A rising path 22 is formed in the opening between the side surface of the burner cap 8 and the outer circumferential surface of the burner upper body 13 so that the air flowing in from the air intake hole 9 can rise to the flame lower. .

Further, it is assumed that ignition is performed on the first gas ejection port 5.

Next, to explain the operation, the liquid kerosene sent by the electromagnetic pump is heated and vaporized in the vaporizer, and the gaseous kerosene is injected by the nozzle 16 due to volume expansion, and the gas flows into the suction port 3 of the burner 1. There will be an influx.

When the injected vaporized kerosene passes through the suction port 3 of the burner 1, surrounding air is sucked into the burner as primary air due to the Venturi effect.

In the mixing chamber 17, vaporized kerosene and primary air are mixed to produce a gaseous fuel. At this time, the partition plate 14 ensures a path to uniformly mix the primary air and vaporized kerosene so that the fuel gas concentration at the first gas outlet 5 and the second gas outlet 6 is uniform in all parts. Contribute to

Therefore, the concentration of the fuel gas ejected through the first gas ejection port 5 and the second gas ejection port 6 of the burner upper body 13 is the same.

The mixture ratio is adjusted by a damper at the stage before the suction port 3 to achieve the best combustion condition.

The burner upper body 13 is surrounded by a burner cap 8, into which air flows in through a plurality of air intake holes 9 on the entire circumference of the side surface of the burner cap 8, and a second gas outlet on the bottom of the protruding cylinder 4. 6 to further dilute the ejected fuel gas.

Ignition is carried out on the undiluted fuel gas ejected from the first gas ejection port 5 on the upper surface of the projecting cylinder 4, and the combustion flame is ejected from the second gas ejection port 6, causing primary air C to be ejected from the air intake hole 9.
The diluted fuel gas contacts and burns. In other words, the combustion continues in a tail-like manner in which light and shade combustion coexists, with the opening of the burner cap 8 serving as the lower flame.

The dilution air is taken in through the air intake hole 9 of the burner cap 8 naturally due to the draft effect caused by the flame in the center of the burner.

In this way, the combustion mode in the present invention is that the first is the spout 5.
combustion, that is, combustion of vaporized kerosene premixed with primary air inside the burner, and combustion of vaporized kerosene premixed with primary air inside burner main unit 2, combustion around the entire circumference of the burner, which is located lower than the center part, Furthermore, the combustion of vaporized kerosene diluted by dilution air from the side holes around the entire circumference of the burner cap 8 is allowed to coexist. The combustion at the second gas nozzle 6 tends to lift due to the low density of vaporized kerosene (1), and it is difficult to burn it alone, but with the assistance of the combustion at the first gas nozzle 5, both burn as one.

Also, combustion from the second gas outlet 6 has a high air ratio (λ>1)
Because of this, the combustion temperature does not rise compared to normal Bunsen combustion, and the combustion constituent gases (02, N2
．． Co2, etc.) stays in the high-temperature atmosphere for a shorter time.

Therefore, the conditions for the formation of N2 → NOx (NOx increases in proportion to the temperature rise above 600°C. It increases in proportion to the residence time in a high-temperature atmosphere) are unfavorable to NOx generation (
It is possible to achieve combustion in the direction of (low), and to achieve low NOx.

In the central part of the flame, the combustion occurs by mixing with the low concentration air remaining in the exhaust gas from the second gas outlet 6h, etc., so the generation of NOx is suppressed.

Furthermore, due to the difference in fuel concentration from the first gas outlet 5 and the second gas outlet 6, the effect of reducing NOx, which has been generated due to the influence of a localized fuel rich region in the combustion system, to N2 can be obtained.

Note that the present invention is not limited to the above embodiments (
Of course, many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects> As is clear from the above description, the present invention includes a suction port for sucking vaporized fuel gas and primary air formed in the lower part of the burner main body, a protruding cylinder formed in the center of the upper part of the burner main body, A first gas outlet is formed on the upper surface of the projecting tube, a second gas outlet is formed at the outer periphery of the projecting tube in the upper part of the burner body, and a burner cap with a flame port is attached to the upper part of the burner body. The present invention relates to a combustion device in which a dilution air intake hole for introducing primary air is formed in the outer circumference of the burner cap.

Therefore, according to the present invention, the combustion mode is the combustion of vaporized kerosene premixed with primary air at the first gas outlet, and further dilution of the premixed vaporized kerosene through the side holes around the burner cap. Since the combustion of the vaporized kerosene diluted by the commercial air coexists, the combustion at the second gas nozzle tends to lift due to the low density of the vaporized kerosene, and it is difficult to burn it alone, but the first gas nozzle Both are combusted as one, assisted by combustion at the outlet. In addition, since the combustion from the second gas outlet has a high air ratio (λ>1), the combustion temperature does not rise more than in normal Bunsen combustion, and the combustion constituent gas (02, N 2. CO2 etc.) stays in a high-temperature atmosphere for a shorter time. Therefore, the generation conditions from N2 to NOx are disadvantageous for NOx generation (small t, %t-Milzn
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Furthermore, in the center of the flame, combustion occurs by mixing with the low concentration air remaining in the exhaust gas from the second gas outlet, which has the excellent effect of suppressing the generation of NOx.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line X-x in FIG. 1, and FIG. 3 is a plan view of the same. B: vaporized fuel gas, C secondary air, 1: burner, 2: burner body, 3: suction port, 4: projecting tube, 5: first gas outlet, 6: second gas outlet, 7 second flame port , 8: Burner cap, 9: Air intake hole.

Claims (1)

[Claims] A suction port for sucking vaporized fuel gas and primary air is formed in the lower part of the burner main body, a protruding cylinder is formed in the center of the upper part of the burner main body, and a first gas outlet is formed on the upper surface of the projecting cylinder, A second gas outlet is formed at the outer periphery of a protruding cylinder at the upper part of the burner body, a burner cap with a flame port is fitted onto the upper part of the burner body, and primary air is introduced into the outer periphery of the burner cap. A combustion device characterized in that a dilution air intake hole is formed for.