DE1992618U - GAS BURNER. - Google Patents

Description

DR-INSV DCPL-INQ. M.SC. DIPL-PHYS. DR. ·. 'OlPL.-PH YS.

HÖGER - LEGAL RIGHT - GRiESSBACH - HAECKER

PATENT LAWYERS IN

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IT.S.Ser.üFo. 641,338

Eclipse Puel Engineering Co., Rockford, Illinois, U.S.A,

Gas burner ■ '. -

The invention "refers to gas burners with separate inlets for gas and air into one end of an oblong 'borrowed _r sleeve at the inlet end of small subsets of gas and air to form a one another - are mixed Zündflamme-, while the remaining part of the gas and the air in a further section: the sleeve mixed and ignited by the pilot flame in order to generate a corresponding flame at the outlet end of the sleeve, which emerges through a nozzle which is used to close the sleeve.

Burners are already known in which air and gas are separated from one end of an elongated line. Sleeve are fed - with small portions - of air and gas being mixed within the inlet end of the sleeve so as to form a constant pilot flame while the · '. . Remaining air and gas mixed and placed inside the sleeve .. · - :; ' ■ .., '- - 2 - ^;

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be ignited in order to produce an effective burning flame, which emerges at the exit end of the sleeve. In these "known gas burners" there is a very strong one inside the sleeve Wear due to the flow of the fluid separate supply lines for the pilot flame required.

The invention now has for its object, to each other to form by special arrangement of the gas and air flows, the subsets ■ for the pilot and improve -the Mischyerhältnisse for ■ a favorable flame "would be this _on: is according to the invention · in." -the gas burner mentioned at the outset is solved in that the sleeve designated as the outer sleeve, ■ an approximately cylindrical inner wall having sleeve on

one end closed and the air inlet close to the closed Indes that is attached in the outer sleeve an essentially cylindrical, im-. Diameter slightly smaller than the outer sleeve formed cup "is arranged concentrically, whose, downstream opening is provided in the outer sleeve, and whose bottom is located near and downstream of the air inlet that an inner sleeve serving for gas supply is provided, which extends axially through the closed end of the outer sleeve extends at least to the open end of the cup, wherein at an angular distance in the jacket of the inner sleeve and the cup. Holes for gas outflow; and air influence and thus to formation

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a "combustible mixture in the bowl" at all gas speeds and a constantly burning pilot flame are provided that the outer sleeve has a mixing zone in front of the open end of the inner sleeve, whose inner wall converges progressively to a nozzle whose opening is significantly smaller than the outer sleeve is in such a way that a tubular air stream is formed flowing along the inner wall of the outer sleeve, "which constricts the diameter of the nozzle to the rapidly advancing gas stream and so, a rapid final mixture of air and gas in the" desired Ratio is achieved. In the improved burner according to the invention, air is thus fed to one end of an outer sleeve and shaped into a cylindrical, tubular flow through a cup which opens downstream and surrounds an inner sleeve, with gas on the other side of the cup is added into the tubular air stream, the holes on the inner sleeve and on the cup allow gas to escape ten and air enter, so that an ignition mixture is generated there, which burns constantly with different gas flows, as they are set for the different temperatures of the flame present at the burner nozzle. ^:

Beyond the bowl, this takes: -of; the inner sleeve fed Gas absorbs air from the surrounding tubular air stream, · wherein the mixture burns constantly along the outer sleeve. at

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Approaching the nozzle, the airflow will converge through the sleeve is contracted into the sleeve wall so that

results in an air-gas mixture for a "particularly advantageous and with a blue flame generated combustion at the various gas velocities. The sleeve wall is shaped so that the tubular shape of the air flow is maintained over the entire Yfeg through the nozzle, so that a disadvantageous Heating or erosion of the sleeve wall 'is avoided «" ■ "' .- · ■ '. - ■,'',..

Further advantages and features of the invention emerge from

the following description in connection with the drawing, which includes an embodiment of the invention. In the drawing show; "

l is a side view of a gas burner according to FIG

Invention, the.-to'a third of the normal size ver is smaller,. '' " Fig. ^ A partial section along -line 2-2 of the -Pig.l,. ■■ 3 shows a section along line 3-3 of FIG. . ■ ··

The invention shown in the drawing is in one a Realized nozzle having Mischbreroier, which has an inner sleeve 10, the gas from one end through a supply line 11 is supplied, while air is introduced under pressure through an outer sleeve 12 surrounding the inner sleeve, all the more so at all gas velocities a constantly burning one.

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To have a pilot flame within the inlet end of the sleeve and also to obtain an advantageously burning and high velocity blue flame 9 exiting a nozzle 13 at the downstream end of the sleeve. A manually or automatically adjustable main valve 14- · is provided in the supply line 11 and is screwed into a connection piece 15 which is fastened to the inlet end of the outer sleeve. A power-driven fan 16 supplies air to the outer sleeve _: at the desired speed, the air being supplied via a connecting piece = 17 becomes, ■.;. ". '·' -

Inside the air sleeve a short distance behind the inlet opening 18, the inner sleeve 10 protrudes into a puddle and is attached there. This splash is above the ground 21 of a cup 22, which has a cylindrical jacket 23, which is slightly smaller in diameter than the outer sleeve 12. and cooperates with the cylindrical inner wall 24, .. in order to create a passage 25 of sufficiently small thickness (in this case If about 6.35 mm) and of a sufficient size Length so that the through the. Inlet port 18 - Incoming air is converted into a tubular air flow. .will. (see the dashed arrows in Pig, 2), which along this shape and 'a good bit over-, the open end 26 of Eapfes 22 and essentially up to the nozzle

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13 is present, '

The · "grass fed through the inner sleeve IO flows through an extension tube 20 within the cup, and a Part of the same can be outwardly through holes 27 of the extension tube escape (indicated by the solid arrows of the Mg / 2) "'and, can be inside the bowl Mix with air, through holes 28 arranged at an angular distance on the bottom 21 of the cup 22 and also via holes is pressed into the jacket of the bowl. The latter holes

are ring-shaped at an axial distance, beyond the holes 27 " of the extension tube 20: The inside of the The mixture formed in the bowl can now be ignited by sparks that skip at the open end of the cup on electrodes of a "spark plug 31. -

Initially, the gas for the ignition mixture becomes the inner sleeve via a line 32 including a Y-valve 33 which is connected to the opposite ends of the supply line 11 and in parallel with the main valve 14, that remains closed until the ignition mixture ignites is »the spark plug and the rod 30 of a flame detector protrude into the outer sleeve 12 and are mounted on it, so that they are immediately beyond the open end 26 of the ■ Well 28 are arranged »'- ·

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The extension tube 20 protrudes, as shown, a short Stüok beyond the open end26 of the cup 22 and is on this end so open that the main part of the gas fed through the pipe is fed into the zone 34 of the outer sleeve which is beyond the open end 26 of the cup. Preferably the extension tube 20 is just about to open End 35 provided with an annular group of holes 36, a partial gas flow to the outside of the forward moving Let the tubular air curtain flow in 'and with it the formation introduce a gas-air mixture, which is then passed through the Pilot flame can be ignited. .

The metal part of the outer sleeve 12 ends in a radial one Flange 37 axially at a small distance beyond the open end of the cup 22 and by screws 38 is attached to a ring 39 which carries one end of a relatively thick-walled mixing sleeve 41 made of refractory ■ .Material consists. The 'inner wall -42 of the mixing sleeve is in Diameter slightly larger than the diameter of the outer

sleeve 12 and extends a considerable length (in the present example approx. 17 _r 78 cm) beyond the end of the outer sleeve. The refractory mixing sleeve, therefore, enlarges somewhat and extends the initial mixing area in order to achieve a progressive mixing of the adjacent parts of the advancing tubular air flow and the central gas flow over a considerable length ^: the;

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to achieve cylindrical, ceramic inner wall 42, In the Zone 34 and 'in porting of it in a substantial Part of the mixing zone 43 of the mixing sleeve as defined by the cylindrical Inner wall 42 is defined, the mixture 'contains a Excess of fuel and therefore burns with a yellow flame «. '■'

The "present invention also provides the arrangement of a Device in the mower of the nozzle 13 in front of a large Velocity is the ratio of air in the gas-air mixture to increase so that now "approximately stoichiometric ratios near and beyond the end of the nozzle are present and thus also an optimal combustion efficiency and a blue flame when the combustion products come out of the nozzle. Such a mixing effect is achieved by

that the diameter of the mixing zone 43, which begins at the end 44 of the inner wall 42, narrows like a neck and inwards conical and preferably convex, as shown at 45 the outlet nozzle is indicated. The diameter of the nozzle is determined by the desired outlet speeds, in the present example about 1/3 of the diameter of the Inner wall 42 .:. ■ '; "

The inwardly converging nozzle wall 43 does not reflect only the incoming, tubular air flow towards the inside of the nozzle, but also pulls it together and furthermore bounces : -. ■ ■■ .-- ■ .-. "./". . ■■■■ '■■'. -. ■■. ■ "■■..; - 9" ■ - ■ = ■ ■ ■ '

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Forward
The central air-gas stream flowing straight ahead, on the other hand. This results in sufficient turbulence in the vicinity of the nozzle, so that additional air is mixed with the available gas, whereby an optimal combustion efficiency is achieved, as shown by the blue flame beyond the nozzle opening. This desired effect occurs all different gas velocities, as they can occur by adjusting the main valve 14, in order to change the volumetric velocity of the gas supply to the inner sleeve and thereby to change the corresponding temperatures of the excess air and the combustion products emerging from the nozzle

According to a further feature of the invention is the converging The nozzle wall or baffle 45 is so far away from the open end 26 of the cup 22 at an axial distance that any risk of reflection within the Mixing sleeve resulting turbulence or -an extinction or any other unfavorable influencing of the continuous. Operation of the pilot flame is avoided, the; yourself, wxe .above mentioned, developed within the bowl 2: 2.

Due to the length and the small radial thickness of the passage 25, the air supplied to the outer sleeve 12 is shaped into a tubular curtain: . . ■ - '■■ ■■■ V.'. - ίο -: ■■ ". ■.". ":. ',

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speed along the inner wall 24 and the inner wall moved forward as an extension of the same. During this "Forward motion becomes the tubular shape of the airflow maintained, so that now the inner walls 24 and 42 against the high, within the combustion zones and 43 developing temperatures are isolated. The most refractory material is thus effectively against Erosio: ■ despite the high speed of the flow along the .V / and protected, ■ · ■ '-'. . "- \ _-; -. ' ·

Such protection of the refractory material extends over the entire area of the nozzle wall-45 through appropriate

' Wall _: --.'-.

Profiling of / ^ to the tubular shape of the advancing air flow to maintain if • to contract due to the convergence of ^r nozzle wall. To this end, not only is the wall "conical" inward, but the slope or angle of convergence of this conicity increases progressively from about 6Ö in the vicinity

the connection with the cylindrical inner wall 42 bis-auf

Zero in the vicinity of the outer end of the nozzle opening. The resulting profile is similar to part of a Cut through an air foil, making it easier Air flow when changing direction to contract the flow, while at the same time the air layer is constantly on the whole area of the wall, is maintained,. ■

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In operation, the fan starts air at such a speed feed like this, for a maximum. Gas flow and flame temperature is required, for example of 141.6 cbm per hour for a burner of the specified Size. When the main valve 14 '. is closed ", that will

"'. Valve 33 opened in order to now supply gas to the pilot flame, laughing at _: Ignition, .." as can be observed through a peephole 47, the main valve 14 is opened more and more in order to allow gas through the extension pipe 20 To be supplied to the extent that it is desired for the desired speed and temperature of the combustion products. The latter burn with high efficiency at all gas velocities.

. and appear as a blue flame on the nozzle,

If a burner is now built as described above and -has the specified size, it was found that Supply of air to the outer sleeve 12 at 147.25 cbm per hour and a gas feed rate of 1.21 cbm per hour speed of the dispensed from the nozzle 13 ■ Flame is approximately 3200.3 m per minute. By increasing the Gas supply to 14.72 cbm per hour with maintenance. of the same air flow increases the flame speed about 8229 m per minute - increased. By setting the Main valve 14 alone can therefore achieve any desired flame speed and temperature; "" ·. ':

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The one built according to the above description according to the invention Burner has numerous advantages in addition to those -which were just mentioned. Once there is a separate pilot light not necessary as a stable pilot flame within the 'Sapfes 22 is maintained. Furthermore, there are high. Outlet speeds without the need for a special; Relationship between air and (yes to adjust, and maintain ,. "The Brenner is. Y relatively insensitive against changes in the ratio of air: gas and. is therefore

not subject to the usual fluctuations as they are with In systems such as those where the flame emerges into a pipe immersed in water, trap and flame safety devices can see through the metal parts ■ extend through, do not need refractory parts through. penetrate and can also relatively in the most favorable positions

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be arranged to the pilot flame, ■

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Claims (1)

P.ä; 28H19 * 1? .5. A 36 452 Ii - 13 - h-24. ■■ ".- ■■. ■ 8.5.1968 ■;. ■■■■■■ Protection claims, 1. Gas burners with separate inlets for gas and air in one end of an elongated sleeve, at the inlet end of which small subsets of gas and air are formed together a pilot flame are mixed while the remaining part of the gas and. the air in a further section of the sleeve • be mixed and ignited by the pilot flame in order to generate a corresponding flame at the outlet end of the sleeve, which is followed by a flame that is used to close the sleeve The nozzle emerges, characterized in that the outer sleeve (12) is an approximately cylindrical inner wall (24) having sleeve closed at one end and the Air inlet (18) attached near the closed end is, "that in the outer sleeve (12) a substantially cylindrical, more open to the nozzle (13), in diameter somewhat smaller than the outer sleeve (12) formed cup (22) is arranged concentrically, the opening of which is downstream in the outer sleeve is provided and its bottom is in the Near and downstream of the air inlet (18) is that one inner sleeve (10) serving for gas supply. is provided that axially through the closed end of the outer sleeve (12) extends at least to the open end of the cup (22), (23)
with holes (27, 29) for gas outflow and air infIu at an angular distance in the jacket of the inner sleeve (10) and the cup (22). and thus for the formation of a combustible mixture in the bowl (22) at all gas velocities and so a constantly burning pilot flame are provided that the outer sleeve (12) A 36 452 Ii V ~ ^U ™ h-24 '■■■ -..-- ■. 8.5.1968. . "■■■■.: a mixing zone in front of the open end of the inner sleeve (10) (34, 43), the inner wall (44, 45) of which progressively one Nozzle (13) converges, the opening of which is much smaller than the outer sleeve (12), such that a tubular, the inner wall of the. Air flow flowing along the outer sleeve (12) forms, which is directed towards the nozzle (13) in the diameter knife . to contract the rapidly advancing gas stream and so a rapid final mixture of air and gas in the desired ratio is achieved. 2. Gas burner according to claim .1, characterized in that the converging inner wall (44 »45) downstream of the cup (22) is arranged at such a distance that the ignition flame is not extinguished by the turbulence generated when the air and gas are mixed in the vicinity of the nozzle (13). 3. Gas burner according to claim 1 or 2, characterized in that .that the angle of convergence of the converging inner wall (44, 45] progressively from a maximum at the end of the cylindrical inner wall (42) of the outer sleeve decreases. .. 4. Gas burner according to one of the preceding claims, characterized characterized in that the decrease in the angle of convergence is such is that constantly a layer of air along the inner wall (42, 44, 45) up to the outlet end of the nozzle (13) upright is obtained. · '· 5. Gas burner according to one of the preceding claims, characterized characterized in that the inner sleeve (10) extends over the open A 36 452 h - 15 - h-24 '' - ■■■■■■ ·. . 8.5.1968 ^: End of the cup (22) extends out and there an annular Has group of holes (36) from which some of the gas can flow outwards in the tubular air flow. 6. Gas burner according to one of the preceding claims, characterized characterized in that the cross section of the outlet opening of the nozzle (13) is approximately one third of the diameter of the '' Outer sleeve (12), especially the part in front of it (41) same, is. . 7. Gas burner according to one of the preceding claims, characterized in that the outer sleeve (12) has an end piece (41), called a mixing sleeve, made of refractory material, which at least the converging inner wall (44, 45) and & ± _e nozzle (13 ) includes. '... - 8. Gas burner according to claim 7, characterized in that the Mixing sleeve (41) also has a substantially cylindrical Inner wall (42) which is in front of the converging inner wall (44, 45) lies. 9. Gas burner according to claim 7 or 8, characterized in that that the mixing sleeve (41) forms the main mixing zone (34, 43). 10. Gas burner according to one of claims 7-9 »characterized in that that in front of the mixing sleeve (41) there is a part of the mixing zone (34, 43). 11. Gas burner according to one of claims 7-10, characterized in that that the diameter of the mixing sleeve (41) is slightly larger than the diameter of the rest of the outer sleeve (12). A 36 452 h,. - 16 - ■;. h-24 '■■■' " 8.5.1968. '. 12. Gas burner according to one of claims 7-11 »dadrirch characterized, that the inner sleeve (10) ends at a distance in front of the mixing sleeve (41). . 13 «Gas burner according to one of the preceding claims, characterized in that the outer sleeve (12) is essentially a has a cylindrical inner wall (24, 42). 14. Gas burner according to one of the preceding claims, characterized characterized in that two parallel feed lines (11, 32) are connected to the gas inlet of the inner sleeve (10), one of which (11) is a main valve (1.4) and the other (32) e.in ignition valve (33) ...