US20110287373A1 - Pilot - Google Patents
Pilot Download PDFInfo
- Publication number
- US20110287373A1 US20110287373A1 US13/143,701 US201013143701A US2011287373A1 US 20110287373 A1 US20110287373 A1 US 20110287373A1 US 201013143701 A US201013143701 A US 201013143701A US 2011287373 A1 US2011287373 A1 US 2011287373A1
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- United States
- Prior art keywords
- pilot
- fuel gas
- annular
- flame
- ignited
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/00002—Cleaning burner parts, e.g. burner tips
Definitions
- the present invention relates to a pilot for igniting a combustible fluid stream and to burners comprising such a pilot.
- Burners are known for the combustive destruction of noxious substances in a fluid stream.
- the combustion can be performed in a combustion chamber by an open flame arrangement or a radiant burning arrangement.
- a fluid stream 52 is introduced through an inlet 54 of a combustion chamber 56 as a mixture with a fuel gas 58 .
- the mixture is ignited by a pilot flame 60 of a pilot 62 and burns as an open flame 64 combusting the noxious substances.
- the pilot 62 comprises an injection tube 66 having an end proximate the inlet of the combustion chamber for introducing a fuel gas which is ignited by igniter 68 and which in turn ignites the mixture as it is introduced to the combustion chamber through the inlet 54 .
- the pilot flame 60 is located at only one position relative to the flame 64 and therefore burning of the flame is more readily achieved in the region close to the pilot flame and may not be achieved, or not fully achieved, at a region remote from the pilot flame. Consequently, mixture entering the combustion chamber may not be completely combusted resulting in noxious substances being exhausted from the burner.
- the injection tube of the pilot is typically relatively narrow and therefore the fuel gas is injected through the tube in a narrow concentrated jet which has a propensity to disrupt the flame 64 causing incomplete combustion of the mixture. If more than one inlet is provided (not shown in FIG. 6 ), for instance for introducing a fluid stream from more than one source of noxious substances, a pilot is required for each of the inlets causing additional expense in addition to the problems identified above.
- a combustion chamber 72 is formed by a surrounding porous generally cylindrical wall 74 .
- Fuel gas 76 is introduced to an outer chamber 78 through inlet 80 and passes through the porous wall 74 .
- a pilot 82 produces a pilot flame 84 for igniting fuel gas at the inner surface of the wall producing a high temperature reaction zone 86 .
- a weir arrangement 88 produces a weir of cold liquid 90 (typically water) for dissolving constituents of the combusted fluid stream and for washing away particulate matter. The cold liquid also cools fluid exhausted from the burner so that it can be conveniently disposed.
- a fluid stream 92 containing at least one noxious substance is introduced into the combustion chamber 72 through inlet 94 and is combusted by contact with the gases from the high temperature reaction zone 86 near the surface of the wall 74 . Combustion is also achieved by the heat which is generated and reflected from an opposing surface of the wall 74 .
- a radiant burner is shown in more detail in EP 0694735.
- the burner 70 suffers from a number of problems.
- the flame 86 when fully ignited is cylindrical and as the pilot flame 84 is located at only one position the high temperature reaction zone 86 ignition is assured in this region.
- the flame 86 may not burn or may not burn fully at areas of the wall 74 which are remote from the pilot. Areas of the wall surface at which a high temperature reaction zone is not maintained may be susceptible to depositing of particulates which causes damage to the porous wall.
- the proximity of the cooling column cools the surface of the wall 74 particularly at the lower part of the wall.
- heat is not reflected from the cooling water which further acts to cool the combustion chamber 72 . Consequently, complete combustion of the fluid stream 92 may not be achieved along with incomplete combustion of the fuel/air mix 76 .
- the provision of a single relatively high energy concentrated flame can damage the delicate porous wall of the burner requiring expensive replacement.
- the present invention provides a pilot for igniting a combustible fluid stream, the pilot comprising an inlet for receiving a fuel gas into the pilot; means for igniting the fuel gas; and a generally annular conduit open along an annular extent by a circumferential aperture for conveying fuel gas from the inlet and so that when the fuel gas is ignited an annular pilot flame is generated.
- FIG. 1 a shows a section through a pilot taken along line I-I in FIG. 2 ;
- FIG. 1 b shows a section through a pilot taken along line J_J in FIG. 2 ;
- FIG. 2 shows an elevation of the pilot indicating the lines of section I-I and J-J;
- FIG. 3 shows an open flame burner comprising the pilot shown in FIG. 1 ;
- FIG. 4 shows a radial burner comprising the pilot shown in FIG. 1 ;
- FIG. 5 shows a further open flame burner comprising the pilot shown in FIG. 1 ;
- FIG. 6 shows a prior art open flame burner
- FIG. 7 shows a prior art radial burner
- FIGS. 8 and 9 show a further pilot made integrally with a weir arrangement of a burner.
- a pilot 10 for igniting a combustible fluid stream.
- the pilot comprises an inlet 12 , which may comprise a venturi arrangement, for receiving a fuel gas 14 , including a fuel and air/oxygen mixture, into the pilot.
- Ignition means 16 for example a spark igniter or an ignition electrode, are provided for igniting the fuel gas 14 .
- a generally annular conduit 18 is open along an annular extent forming a circumferential aperture 20 .
- the conduit 18 conveys fuel gas from the inlet to the circumferential aperture. When the fuel gas flowing out of the circumferential aperture 20 is ignited a continuous annular pilot flame is generated radially of the conduit.
- the annular conduit as shown is circular, but may be formed of other shapes such as a square, rectangle or hexagonal.
- the annular conduit conveys fuel gas from the inlet through 360° and allows the gas to flow from the inlet so that when it is ignited an annular flame is generated.
- the annular flame generated need not be ring-shaped, but instead corresponds generally to the shape of the conduit. For example, if the conduit is rectangular then a generally rectangular flame is generated.
- the conduit as shown in FIGS. 1 a , 1 b and 2 is open along its annular extent by the circumferential aperture 20 .
- the aperture extends through 360° to allow fuel gas to flow from the conduit approximately equally about its circumference.
- the aperture is determined in size to ensure that an equal flow of fuel gas is distributed around the circumference generating a consistent flame.
- the fuel gas typically contains a mixture of fuel such as a hydrocarbon and oxygen or air.
- the conduit 18 is open along a radially inner annular extent so that the circumferential aperture 20 faces radially inwardly.
- the annular pilot flame is generated radially inwardly of the conduit for surrounding a fluid stream to be ignited.
- the conduit may be open in an axial direction, for instance, at the surface facing upwardly, or out of the page, in FIG. 2 .
- the ignition means 16 as shown is disposed at a single location in the circumference of the pilot and in use ignites the fuel gas to form the continuous annular pilot flame.
- the pilot flame may not be fully annular at all times after ignition as the flow of fuel gas may not be distributed completely equally about the circumference or the fluid stream may occasionally extinguish part of the annular flame.
- the pilot is capable of generating a continuous annular pilot flame.
- Monitoring or sensing means may be placed at intervals around the pilot for monitoring or sensing characteristics of the pilot, such as the presence of a flame, or the flow or pressure of fuel gas. Such sensing means may feed back to a control for the pilot which may be connected to a fuel gas supply valve or the igniting means.
- the generally annular conduit 18 in FIGS. 1 a , 1 b and 2 comprises a plenum chamber 22 for receiving fuel gas from the inlet 14 and a circumferential channel 24 for channelling fuel gas from the plenum chamber to the circumferential aperture 20 for forming the continuous annular pilot flame.
- the plenum chamber 22 distributes the fuel gas generally equally around the annular extent of the conduit 18 at an equal pressure so that when ignited the continuous annular pilot flame burns generally evenly at approximately the same intensity and size about the annular extent of the conduit. This arrangement promotes the generation of a pilot flame which is annular and unbroken.
- the pressure of gas in the conduit 18 may be greatest in the region proximate the inlet 12 . Accordingly, the amount of gas exiting the circumferential aperture 20 may be greatest near the inlet and hence the annular flame may be largest near the inlet 12 .
- the plenum chamber arrangement as described above serves to distribute the gas equally around the conduit. Additionally it will be seen that inlet 12 is not aligned with channel portion 24 . Instead gas entering through the inlet must flow along a tortuous path prior to exiting the pilot through the circumferential aperture. In this way, the surface of the plenum chamber opposed to the inlet and the upper surface of the baffle as shown in FIGS. 1 a and 1 b act as baffles to the flow of fuel gas.
- the pilot may be moulded from a metallic material in a single piece or two or more pieces which are subsequently fixed together.
- the channel portion 24 or other portion of the pilot which is in contact with or closely adjacent to the pilot flame, may be formed from a heat or flame resistant material, such as a ceramic material or a metal such as stainless steel. It is preferable to avoid a metal surface in contact with the pilot flame since this may generate undesirable nitrogen oxide compounds.
- fuel gas is introduced to the conduit 22 and conveyed around the conduit so that it can flow out of the circumferential aperture 20 .
- the ignition means 16 ignites the fuel gas generating a pilot flame which extends radially inwardly from the aperture and in a generally annular configuration.
- the rate at which fuel gas is introduced to the conduit and the size of the aperture are selected to reduce the possibility of flash back into the plenum chamber 22 .
- the flame speed should be less than forward velocity of the fuel gas.
- the flame speed is the speed a flame passes back towards its source fuel and oxidant.
- the forward velocity is the speed at which gas is conveyed through the aperture in a generally radially inwards direction and should be greater in velocity than the flame speed.
- the gas mixture leaves the aperture, it will spread out (fan like), thereby reducing the forward velocity.
- the anchor region at which the forward velocity equals flame speed is consequently just beyond the exit of the aperture.
- flame resistant portions made for instance of ceramic, may be disposed in the region of the aperture 20 .
- the pilot is formed in this example by a first, or lower, pilot plate 116 , which together with a second, or upper, pilot plate 117 forms the plenum chamber 22 , the channel portion 22 and circumferential aperture 20 .
- the first and second pilot plates may be fixed together by any suitable means such as by bolts.
- Spacers 121 are placed at intervals around the pilot plate for spacing the first pilot plate from the second pilot plate. The spacers ensure that the channel portion 24 and circumferential aperture 20 are sized correctly and uniformly around the pilot.
- Ignition means 16 which in this example is an ignition electrode extends through the wall of the first pilot plate and is made gas tight by means of a swageing system. The ignition electrode extends into the circumferential aperture to provide an ignition source when the fuel gas is flowing through the aperture.
- Inlet 12 is formed in the first pilot plate 116 which may be sealed with a Swagelok component.
- An open flame burner 27 comprising pilot 10 is shown partially in FIG. 3 .
- the pilot 10 is not shown in detail in FIG. 3 for simplicity.
- a fluid stream 29 is introduced through an inlet 31 of the combustion chamber 33 as a mixture with a fuel gas 35 .
- the mixture is ignited by a pilot flame 37 of the pilot 10 and burns as an open flame 39 combusting the noxious substances.
- the pilot flame 37 is annular and therefore surrounds the fluid stream and fuel gas mixture as it enters the combustion chamber 33 through the inlet 31 .
- the term “horizontal pilot” as used herein is used to describe the arrangement shown in that the pilot extends generally perpendicularly to the direction of flow of gases entering the burner. Usually a burner is upright as shown and in this case the pilot is generally horizontal.
- a radial burner 26 comprising pilot 10 , is shown for removing noxious substances from a fluid stream 28 .
- the burner 26 comprises a combustion region in which a fuel gas can be burnt for combusting the fluid stream.
- the combustion region is formed by a chamber 30 surrounded by a generally cylindrical wall 32 .
- the wall 32 is porous to allow passage of fuel gas through it into the combustion chamber for burning on the inner surface of the wall.
- Fuel gas 34 is introduced to an outer chamber 36 through inlet 38 and passes through the wall 32 .
- the wall may form a right circular cylinder, elliptic cylinder, parabolic cylinder, or hyperbolic cylinder such that the wall forms a surface on which fuel gas 34 can burn radiating hear radially inwardly and combusting the fluid stream. It will also be understood that the pilot 10 is located away from the top, or head, of the burner where space is limited.
- a weir arrangement 44 produces a weir of cold liquid 46 (typically water) for dissolving constituents of the combusted fluid stream and for washing away particulate matter.
- the cold liquid also cools fluid exhausted from the burner so that it can be conveniently disposed.
- the pilot 10 is shown in simplified form in FIG. 4 and is located below the wall 32 and between the combustion chamber 30 and the weir arrangement 44 . In use the pilot 10 generates an annular flame 40 although only a semi-circular portion of which is shown in FIG. 4 .
- the pilot flame 40 ignites fuel gas at the inner surface of the wall producing a flame 42 .
- the fluid stream 28 containing at least one noxious substance is introduced into the combustion chamber 30 through inlet 48 and is combusted by contact with the hot reaction zone 42 near the surface of the wall 74 .
- the pilot 10 is located so that when ignited the continuous annular pilot flame 40 and the generally cylindrical wall 32 are adjacent along their respective annular extents such that the fuel gas 34 passing through the generally cylindrical wall can be efficiently ignited and a flame at the surface maintained.
- the annular pilot flame 40 ensures that the full circumferential extent of the lower portion of the flame 42 is ignited and maintained alight, combustion of the fuel gas 34 over the full inner surface of the wall 32 is increased.
- the pilot 10 is located so that when ignited the continuous annular pilot flame 40 thermally insulates the base of the main combustor reaction zone 42 from chilling effect generated by the relatively cold liquid 46 passing over the weir arrangement. Accordingly, heat is more efficiently generated at the base of the reaction zone 42 , thereby improving the emissions from the combustor at the base nearest the weir, for example carbon monoxide and hydrocarbon emissions (CxHy).
- Table 1 shows the improvement observed in testing the embodiment of the invention.
- heating the base of the radiant burner pad improves the combustion at the base.
- Powders tend to form at the base of the combustor due to reduced temperature of the combustor pad 32 /reaction zone at the base.
- the provision of a horizontal pilot thermally insulates the base of the pad increasing efficiency of the pad allowing it to sustain hotter temperatures. Additionally, the horizontal pilot decreases the propensity for powder to adhere to the delicate porous structure of the pad 32 .
- the problem of powder deposition still occurs but in the embodiment it occurs downstream of the pad 32 .
- the pilot plates are relatively robust and the deposition of powder on the pilot is not considered a significant problem.
- the solids may include silica which is easily removed by light agitation of the surface of the pilot by compressed air or water flows. Further, the pilot can be cleaned by washing with water in an in situ cleaning method (described in more detail below with reference to FIGS. 8 and 9 )
- the pilot 10 provides a low energy distributed flame surface which has less propensity to damage the delicate porous wall 32 .
- the radial burner shown in FIG. 4 can be used in combination with the open flame burner shown in FIG. 3 for combusting certain types of noxious substances in the fluid stream.
- the inlet upstream of the combustion chamber 30 shown in FIG. 4 is adapted for introducing the fluid stream and a fuel gas as a mixture into the combustion region as shown in WO2006/013355 the contents of which are hereby incorporated by reference.
- the mixture at the inlet can be ignited by the flame 42 formed at the surface of the generally cylindrical wall which is itself ignited by pilot 10 at the base of the cylindrical wall.
- the pilot 10 is located between the wall 32 and the inlet (at the top of the wall as shown in FIG. 4 ) for igniting both the mixture at the inlet and the fuel gas at the surface of the wall.
- FIG. 5 shows a modification of the open flame burner shown in FIG. 3 .
- the burner 45 is suitable for removing noxious substances from a plurality of fluid streams 47 , for instance, from a respective plurality of semi-conductor wafer processing chambers.
- Burner 45 comprises an inlet 41 , 43 for each fluid stream 47 . Although only two inlets are shown the burner may comprise more than two inlets.
- the inlets 41 , 43 introduce the plurality of fluid streams 47 and fuel gas 49 as respective mixtures into the combustion chamber 33 .
- the pilot 10 is located so that when ignited the continuous annular pilot flame 37 surrounds mixtures to be burned so that all of the mixtures can be ignited by a single pilot.
- in-situ cleaning of the pilot plate can be performed Cleaning is performed by pumping pressurized fluid, such as water or air, through inlet 12 of the pilot, through the plenum chamber and out of the circumferential aperture 20 .
- pressurized fluid such as water or air
- tthe fluid is a liquid, as a liquid falls under gravity removing particulates from the outer wall of the lower pilot plate 116 .
- pilot plate 10 may be integrated with the weir 44 .
- a passage 112 is machined between the pilot plate plenum 105 and the weir volume 107 .
- a bung 106 is moveable from a first position in which it blocks the passage 112 and a second position in which the passage is open.
- water injected through inlet 12 of the pilot can flow into the pilot plenum 105 and out through the circumferential aperture 109 , running down the entirety of the outer wall of the lower pilot plate 102 , removing solid residue by physical and chemical (dissolving) action. After cleaning the water is switched off and the plenum chamber allowed to drain.
- the bung 106 is then reengaged.
- the pilot is dried by blowing air through the inlet. Once dry, the pilot can be ignited. It will be appreciated that the process described for in-situ cleaning is more efficient and less time intensive than disassembling the burner, disconnecting various pipes, cleaning the pilot and subsequently re-assembling the burner and re-connecting the pipes. Further, in-situ cleaning reduces the possibility of the operator coming into contact with potentially dangerous combustion byproducts (ie oxides of Arsenic on AsH3 processes).
- a method of cleaning pilot 10 in situ in a burner comprises: disconnecting a source of fuel from an inlet to the pilot; connecting a source of cleaning fluid to the inlet; and cleaning the pilot with said fluid.
Abstract
A pilot (10) is shown for igniting a combustible fluid stream. The pilot comprises an inlet (12), for receiving a fuel gas (14), including a fuel and air/oxygen mixture, into the pilot. Ignition means (16), for example a spark igniter or an ignition electrode, are provided for igniting the fuel gas (14). A generally annular conduit (18) is open along an annular extent forming a circumferential aperture (20). The conduit (18) conveys fuel gas from the inlet to the circumferential aperture. When the fuel gas flowing out of the circumferential aperture (20) is ignited a continuous annular pilot flame is generated radially of the conduit.
Description
- The present invention relates to a pilot for igniting a combustible fluid stream and to burners comprising such a pilot.
- Burners are known for the combustive destruction of noxious substances in a fluid stream. The combustion can be performed in a combustion chamber by an open flame arrangement or a radiant burning arrangement.
- In an
open flame burner 50 as shown partially inFIG. 6 , afluid stream 52 is introduced through aninlet 54 of acombustion chamber 56 as a mixture with afuel gas 58. The mixture is ignited by apilot flame 60 of apilot 62 and burns as anopen flame 64 combusting the noxious substances. Thepilot 62 comprises aninjection tube 66 having an end proximate the inlet of the combustion chamber for introducing a fuel gas which is ignited byigniter 68 and which in turn ignites the mixture as it is introduced to the combustion chamber through theinlet 54. - A number of problems exist with the
burner 50. Thepilot flame 60 is located at only one position relative to theflame 64 and therefore burning of the flame is more readily achieved in the region close to the pilot flame and may not be achieved, or not fully achieved, at a region remote from the pilot flame. Consequently, mixture entering the combustion chamber may not be completely combusted resulting in noxious substances being exhausted from the burner. Further, the injection tube of the pilot is typically relatively narrow and therefore the fuel gas is injected through the tube in a narrow concentrated jet which has a propensity to disrupt theflame 64 causing incomplete combustion of the mixture. If more than one inlet is provided (not shown inFIG. 6 ), for instance for introducing a fluid stream from more than one source of noxious substances, a pilot is required for each of the inlets causing additional expense in addition to the problems identified above. - In a
radiant burner 70 as shown inFIG. 7 , acombustion chamber 72 is formed by a surrounding porous generallycylindrical wall 74.Fuel gas 76 is introduced to anouter chamber 78 throughinlet 80 and passes through theporous wall 74. Apilot 82 produces apilot flame 84 for igniting fuel gas at the inner surface of the wall producing a hightemperature reaction zone 86. Aweir arrangement 88 produces a weir of cold liquid 90 (typically water) for dissolving constituents of the combusted fluid stream and for washing away particulate matter. The cold liquid also cools fluid exhausted from the burner so that it can be conveniently disposed. A fluid stream 92 containing at least one noxious substance is introduced into thecombustion chamber 72 throughinlet 94 and is combusted by contact with the gases from the hightemperature reaction zone 86 near the surface of thewall 74. Combustion is also achieved by the heat which is generated and reflected from an opposing surface of thewall 74. A radiant burner is shown in more detail in EP 0694735. - The
burner 70 suffers from a number of problems. First, theflame 86 when fully ignited is cylindrical and as thepilot flame 84 is located at only one position the hightemperature reaction zone 86 ignition is assured in this region. Theflame 86 may not burn or may not burn fully at areas of thewall 74 which are remote from the pilot. Areas of the wall surface at which a high temperature reaction zone is not maintained may be susceptible to depositing of particulates which causes damage to the porous wall. Further, the proximity of the cooling column cools the surface of thewall 74 particularly at the lower part of the wall. Also, heat is not reflected from the cooling water which further acts to cool thecombustion chamber 72. Consequently, complete combustion of the fluid stream 92 may not be achieved along with incomplete combustion of the fuel/air mix 76. Additionally, the provision of a single relatively high energy concentrated flame can damage the delicate porous wall of the burner requiring expensive replacement. - The present invention provides a pilot for igniting a combustible fluid stream, the pilot comprising an inlet for receiving a fuel gas into the pilot; means for igniting the fuel gas; and a generally annular conduit open along an annular extent by a circumferential aperture for conveying fuel gas from the inlet and so that when the fuel gas is ignited an annular pilot flame is generated.
- Other preferred and/or optional aspects of the invention are defined in the accompanying claims.
- In order that the present invention may be well understood, embodiments thereof, which are given by way of example only, will now be described with reference to the accompanying drawings, in which:
-
FIG. 1 a shows a section through a pilot taken along line I-I inFIG. 2 ; -
FIG. 1 b shows a section through a pilot taken along line J_J inFIG. 2 ; -
FIG. 2 shows an elevation of the pilot indicating the lines of section I-I and J-J; -
FIG. 3 shows an open flame burner comprising the pilot shown inFIG. 1 ; -
FIG. 4 shows a radial burner comprising the pilot shown inFIG. 1 ; -
FIG. 5 shows a further open flame burner comprising the pilot shown inFIG. 1 ; -
FIG. 6 shows a prior art open flame burner; -
FIG. 7 shows a prior art radial burner; -
FIGS. 8 and 9 show a further pilot made integrally with a weir arrangement of a burner. - Referring to
FIGS. 1 a, 1 b and 2, apilot 10 is shown for igniting a combustible fluid stream. The pilot comprises aninlet 12, which may comprise a venturi arrangement, for receiving afuel gas 14, including a fuel and air/oxygen mixture, into the pilot. Ignition means 16, for example a spark igniter or an ignition electrode, are provided for igniting thefuel gas 14. A generallyannular conduit 18 is open along an annular extent forming acircumferential aperture 20. Theconduit 18 conveys fuel gas from the inlet to the circumferential aperture. When the fuel gas flowing out of thecircumferential aperture 20 is ignited a continuous annular pilot flame is generated radially of the conduit. - The annular conduit as shown is circular, but may be formed of other shapes such as a square, rectangle or hexagonal. In this regard, the annular conduit conveys fuel gas from the inlet through 360° and allows the gas to flow from the inlet so that when it is ignited an annular flame is generated. Likewise, the annular flame generated need not be ring-shaped, but instead corresponds generally to the shape of the conduit. For example, if the conduit is rectangular then a generally rectangular flame is generated.
- The conduit as shown in
FIGS. 1 a, 1 b and 2 is open along its annular extent by thecircumferential aperture 20. The aperture extends through 360° to allow fuel gas to flow from the conduit approximately equally about its circumference. The aperture is determined in size to ensure that an equal flow of fuel gas is distributed around the circumference generating a consistent flame. - The fuel gas typically contains a mixture of fuel such as a hydrocarbon and oxygen or air.
- As shown in
FIGS. 1 and 2 , theconduit 18 is open along a radially inner annular extent so that thecircumferential aperture 20 faces radially inwardly. When thefuel gas 14 is ignited by the igniting means 16 the annular pilot flame is generated radially inwardly of the conduit for surrounding a fluid stream to be ignited. In other arrangements, the conduit may be open in an axial direction, for instance, at the surface facing upwardly, or out of the page, inFIG. 2 . - Although the pilot flame generated is annular only a
single igniter 16 is required since once the flame is ignited in the region of the igniter it readily spreads around the circumference of the pilot. Therefore, the ignition means 16 as shown is disposed at a single location in the circumference of the pilot and in use ignites the fuel gas to form the continuous annular pilot flame. The pilot flame may not be fully annular at all times after ignition as the flow of fuel gas may not be distributed completely equally about the circumference or the fluid stream may occasionally extinguish part of the annular flame. However, generally in use the pilot is capable of generating a continuous annular pilot flame. - Monitoring or sensing means may be placed at intervals around the pilot for monitoring or sensing characteristics of the pilot, such as the presence of a flame, or the flow or pressure of fuel gas. Such sensing means may feed back to a control for the pilot which may be connected to a fuel gas supply valve or the igniting means.
- The generally
annular conduit 18 inFIGS. 1 a, 1 b and 2 comprises aplenum chamber 22 for receiving fuel gas from theinlet 14 and acircumferential channel 24 for channelling fuel gas from the plenum chamber to thecircumferential aperture 20 for forming the continuous annular pilot flame. In use theplenum chamber 22 distributes the fuel gas generally equally around the annular extent of theconduit 18 at an equal pressure so that when ignited the continuous annular pilot flame burns generally evenly at approximately the same intensity and size about the annular extent of the conduit. This arrangement promotes the generation of a pilot flame which is annular and unbroken. - The pressure of gas in the
conduit 18 may be greatest in the region proximate theinlet 12. Accordingly, the amount of gas exiting thecircumferential aperture 20 may be greatest near the inlet and hence the annular flame may be largest near theinlet 12. The plenum chamber arrangement as described above serves to distribute the gas equally around the conduit. Additionally it will be seen thatinlet 12 is not aligned withchannel portion 24. Instead gas entering through the inlet must flow along a tortuous path prior to exiting the pilot through the circumferential aperture. In this way, the surface of the plenum chamber opposed to the inlet and the upper surface of the baffle as shown inFIGS. 1 a and 1 b act as baffles to the flow of fuel gas. - The pilot may be moulded from a metallic material in a single piece or two or more pieces which are subsequently fixed together. The
channel portion 24, or other portion of the pilot which is in contact with or closely adjacent to the pilot flame, may be formed from a heat or flame resistant material, such as a ceramic material or a metal such as stainless steel. It is preferable to avoid a metal surface in contact with the pilot flame since this may generate undesirable nitrogen oxide compounds. - In use, fuel gas is introduced to the
conduit 22 and conveyed around the conduit so that it can flow out of thecircumferential aperture 20. When the flow through the aperture is established the ignition means 16 ignites the fuel gas generating a pilot flame which extends radially inwardly from the aperture and in a generally annular configuration. The rate at which fuel gas is introduced to the conduit and the size of the aperture are selected to reduce the possibility of flash back into theplenum chamber 22. In this regard, the flame speed should be less than forward velocity of the fuel gas. The flame speed is the speed a flame passes back towards its source fuel and oxidant. The forward velocity is the speed at which gas is conveyed through the aperture in a generally radially inwards direction and should be greater in velocity than the flame speed. As the gas mixture leaves the aperture, it will spread out (fan like), thereby reducing the forward velocity. The anchor region at which the forward velocity equals flame speed is consequently just beyond the exit of the aperture. If the material from which the main portions of the pilot is made is metallic, flame resistant portions, made for instance of ceramic, may be disposed in the region of theaperture 20. - The pilot is formed in this example by a first, or lower,
pilot plate 116, which together with a second, or upper,pilot plate 117 forms theplenum chamber 22, thechannel portion 22 andcircumferential aperture 20. The first and second pilot plates may be fixed together by any suitable means such as by bolts.Spacers 121 are placed at intervals around the pilot plate for spacing the first pilot plate from the second pilot plate. The spacers ensure that thechannel portion 24 andcircumferential aperture 20 are sized correctly and uniformly around the pilot. Ignition means 16 which in this example is an ignition electrode extends through the wall of the first pilot plate and is made gas tight by means of a swageing system. The ignition electrode extends into the circumferential aperture to provide an ignition source when the fuel gas is flowing through the aperture.Inlet 12 is formed in thefirst pilot plate 116 which may be sealed with a Swagelok component. - An
open flame burner 27 comprisingpilot 10 is shown partially inFIG. 3 . Thepilot 10 is not shown in detail inFIG. 3 for simplicity. - A
fluid stream 29 is introduced through aninlet 31 of thecombustion chamber 33 as a mixture with afuel gas 35. The mixture is ignited by apilot flame 37 of thepilot 10 and burns as anopen flame 39 combusting the noxious substances. Although only a semi-circular portion of theflame 37 is shown inFIG. 3 , thepilot flame 37 is annular and therefore surrounds the fluid stream and fuel gas mixture as it enters thecombustion chamber 33 through theinlet 31. The term “horizontal pilot” as used herein is used to describe the arrangement shown in that the pilot extends generally perpendicularly to the direction of flow of gases entering the burner. Usually a burner is upright as shown and in this case the pilot is generally horizontal. Accordingly, the mixture is exposed to the pilot flame laterally from all sides ensuring relatively complete combustion of the mixture. This arrangement constitutes an improvement over the prior art described above in which only the portion of the fluid stream proximate the pilot flame is consistently burnt. Additionally, as thecircumferential aperture 20 is relatively large and the flame is therefore a distributed low energy flame the fuel gas flowing through the aperture does not significantly disrupt themain flame 39. Referring toFIG. 4 , aradial burner 26, comprisingpilot 10, is shown for removing noxious substances from afluid stream 28. Theburner 26 comprises a combustion region in which a fuel gas can be burnt for combusting the fluid stream. In this arrangement the combustion region is formed by achamber 30 surrounded by a generallycylindrical wall 32. Thewall 32 is porous to allow passage of fuel gas through it into the combustion chamber for burning on the inner surface of the wall.Fuel gas 34 is introduced to anouter chamber 36 throughinlet 38 and passes through thewall 32. The wall may form a right circular cylinder, elliptic cylinder, parabolic cylinder, or hyperbolic cylinder such that the wall forms a surface on whichfuel gas 34 can burn radiating hear radially inwardly and combusting the fluid stream. It will also be understood that thepilot 10 is located away from the top, or head, of the burner where space is limited. - A
weir arrangement 44 produces a weir of cold liquid 46 (typically water) for dissolving constituents of the combusted fluid stream and for washing away particulate matter. The cold liquid also cools fluid exhausted from the burner so that it can be conveniently disposed. - The
pilot 10 is shown in simplified form inFIG. 4 and is located below thewall 32 and between thecombustion chamber 30 and theweir arrangement 44. In use thepilot 10 generates anannular flame 40 although only a semi-circular portion of which is shown inFIG. 4 . Thepilot flame 40 ignites fuel gas at the inner surface of the wall producing aflame 42. Thefluid stream 28 containing at least one noxious substance is introduced into thecombustion chamber 30 throughinlet 48 and is combusted by contact with thehot reaction zone 42 near the surface of thewall 74. - The
pilot 10 is located so that when ignited the continuousannular pilot flame 40 and the generallycylindrical wall 32 are adjacent along their respective annular extents such that thefuel gas 34 passing through the generally cylindrical wall can be efficiently ignited and a flame at the surface maintained. As theannular pilot flame 40 ensures that the full circumferential extent of the lower portion of theflame 42 is ignited and maintained alight, combustion of thefuel gas 34 over the full inner surface of thewall 32 is increased. - Additionally, the
pilot 10 is located so that when ignited the continuousannular pilot flame 40 thermally insulates the base of the maincombustor reaction zone 42 from chilling effect generated by the relatively cold liquid 46 passing over the weir arrangement. Accordingly, heat is more efficiently generated at the base of thereaction zone 42, thereby improving the emissions from the combustor at the base nearest the weir, for example carbon monoxide and hydrocarbon emissions (CxHy). Table 1 shows the improvement observed in testing the embodiment of the invention. -
TABLE 1 Conditions Residual oxygen Carbon monoxide CxHy Prior Art shown in 5.2% 196 ppm 0.34% FIG. 7 Embodiment shown in 5.0% 100 ppm 0.17% FIG. 4 with horizontal pilot - The improvement is due to a numbers of aspects of the embodiment. For example, heating the base of the radiant burner pad improves the combustion at the base.
- Powders tend to form at the base of the combustor due to reduced temperature of the
combustor pad 32/reaction zone at the base. The provision of a horizontal pilot thermally insulates the base of the pad increasing efficiency of the pad allowing it to sustain hotter temperatures. Additionally, the horizontal pilot decreases the propensity for powder to adhere to the delicate porous structure of thepad 32. The problem of powder deposition still occurs but in the embodiment it occurs downstream of thepad 32. However, the pilot plates are relatively robust and the deposition of powder on the pilot is not considered a significant problem. The solids may include silica which is easily removed by light agitation of the surface of the pilot by compressed air or water flows. Further, the pilot can be cleaned by washing with water in an in situ cleaning method (described in more detail below with reference toFIGS. 8 and 9 ) - Advantageously, the
pilot 10 provides a low energy distributed flame surface which has less propensity to damage the delicateporous wall 32. - Although not depicted, the radial burner shown in
FIG. 4 can be used in combination with the open flame burner shown inFIG. 3 for combusting certain types of noxious substances in the fluid stream. In this arrangement, the inlet upstream of thecombustion chamber 30 shown inFIG. 4 is adapted for introducing the fluid stream and a fuel gas as a mixture into the combustion region as shown in WO2006/013355 the contents of which are hereby incorporated by reference. The mixture at the inlet can be ignited by theflame 42 formed at the surface of the generally cylindrical wall which is itself ignited bypilot 10 at the base of the cylindrical wall. Alternatively, thepilot 10 is located between thewall 32 and the inlet (at the top of the wall as shown inFIG. 4 ) for igniting both the mixture at the inlet and the fuel gas at the surface of the wall. -
FIG. 5 shows a modification of the open flame burner shown inFIG. 3 . Theburner 45 is suitable for removing noxious substances from a plurality offluid streams 47, for instance, from a respective plurality of semi-conductor wafer processing chambers.Burner 45 comprises aninlet fluid stream 47. Although only two inlets are shown the burner may comprise more than two inlets. Theinlets fluid streams 47 andfuel gas 49 as respective mixtures into thecombustion chamber 33. Thepilot 10 is located so that when ignited the continuousannular pilot flame 37 surrounds mixtures to be burned so that all of the mixtures can be ignited by a single pilot. - Typically, cleaning of the
pilot 10 requires removal of theburner arrangement 26 and this removal is labour intensive and results in significant tool downtime. - However, in-situ cleaning of the pilot plate can be performed Cleaning is performed by pumping pressurized fluid, such as water or air, through
inlet 12 of the pilot, through the plenum chamber and out of thecircumferential aperture 20. Advantageously, tthe fluid is a liquid, as a liquid falls under gravity removing particulates from the outer wall of thelower pilot plate 116. - Further, the
pilot plate 10 may be integrated with theweir 44. As shown inFIGS. 8 and 9 , apassage 112 is machined between thepilot plate plenum 105 and theweir volume 107. Abung 106 is moveable from a first position in which it blocks thepassage 112 and a second position in which the passage is open. When the passage is open, water injected throughinlet 12 of the pilot can flow into thepilot plenum 105 and out through thecircumferential aperture 109, running down the entirety of the outer wall of thelower pilot plate 102, removing solid residue by physical and chemical (dissolving) action. After cleaning the water is switched off and the plenum chamber allowed to drain. Once drained, thebung 106 is then reengaged. The pilot is dried by blowing air through the inlet. Once dry, the pilot can be ignited. It will be appreciated that the process described for in-situ cleaning is more efficient and less time intensive than disassembling the burner, disconnecting various pipes, cleaning the pilot and subsequently re-assembling the burner and re-connecting the pipes. Further, in-situ cleaning reduces the possibility of the operator coming into contact with potentially dangerous combustion byproducts (ie oxides of Arsenic on AsH3 processes). - Accordingly, a method of cleaning
pilot 10 in situ in a burner comprises: disconnecting a source of fuel from an inlet to the pilot; connecting a source of cleaning fluid to the inlet; and cleaning the pilot with said fluid.
Claims (17)
1. A pilot for igniting a combustible fluid stream, the pilot comprising an inlet for receiving a fuel gas into the pilot; means for igniting the fuel gas; and a generally annular conduit open along an annular extent by a circumferential aperture for conveying fuel gas from the inlet and so that when the fuel gas is ignited an annular pilot flame is generated.
2. A pilot as claimed in claim 1 , wherein the conduit is open along a radially inner annular extent so that when the fuel gas is ignited an annular pilot flame is generated radially inwardly of the conduit.
3. A pilot as claimed in claim 1 or 2 , wherein when ignited said pilot flame is continuous around the annular extent of the pilot.
4. A pilot as claimed in any preceding claim, the ignition means comprises a spark igniter.
5. A pilot as claimed in any preceding claim, wherein the ignition means comprises a single igniter and in use ignites the fuel gas to form the continuous annular pilot flame.
6. A pilot as claimed in any preceding claim, wherein the generally annular conduit comprises a plenum chamber for receiving fuel gas from the inlet and a circumferential channel for channelling fuel gas from the plenum chamber for forming the continuous annular pilot flame.
7. A pilot as claimed in claim 6 , wherein in use the plenum chamber distributes the fuel gas at a generally equal pressure around the annular extent of the conduit so that when ignited the continuous annular pilot flame burns generally evenly about the annular extent of the of the conduit.
8. A burner for removing noxious substances from a fluid stream, the burner comprising:
a combustion region in which a fuel gas can be burnt for combusting the fluid stream; and
a pilot as claimed in of claims 1 to 7 for igniting the fuel gas in the combustion chamber.
9. A burner as claimed in claim 8 , wherein the combustion region is formed by a chamber having a surrounding generally cylindrical wall for introducing therethrough into the combustion chamber a fuel gas for burning on a surface of said wall when ignited by the pilot so that a fluid stream passing through said chamber can be combusted.
10. A burner as claimed in claim 9 , wherein the pilot is located so that when ignited the annular pilot flame and the wall are adjacent along their respective annular extents such that the fuel gas passing through the wall can be efficiently ignited and a flame at the surface maintained.
11. A burner as claimed in claim 10 , comprising a weir arrangement positioned downstream of the combustion chamber for receiving the combusted fuel stream, wherein the pilot is located so that when ignited the annular pilot flame thermally insulates the generally cylindrical wall from relatively cold liquid passing over the weir arrangement.
12. A burner as claimed in any of claims 8 to 11 , said combustion region comprising an inlet upstream of the combustion chamber for introducing the fluid stream and a fuel gas as a mixture into the combustion region.
13. A burner as claimed in claim 12 , wherein said mixture is ignited at said inlet by the flame formed at the surface of the generally cylindrical wall.
14. A burner as claimed in claim 13 , wherein said pilot is located between the generally cylindrical wall and the inlet for igniting mixture at the inlet and the fuel gas at the surface of the generally cylindrical wall.
15. A burner as claimed in claim 8 , wherein said combustion region comprises an inlet upstream of the combustion chamber for introducing the fluid stream and a fuel gas as a mixture into the combustion region and said pilot is located so that when ignited the annular pilot flame surrounds the mixture to be burned.
16. A burner as claimed in claim 14 , wherein comprising a plurality of inlets to the combustion chamber for introducing a plurality of fluid streams and fuel gas as respective mixtures into the combustion chamber and said pilot is located so that when ignited the annular pilot flame surrounds mixtures to be burned so that all of the mixtures can be ignited by said pilot.
17. A burner as claimed in claim 11 or 12 , in which a portion of the weir arrangement is integral with the pilot and wherein the pilot comprises a closeable passage which when open water used to clean the pilot flows through the passage and over the weir, and when closed the pilot can form said annular flame.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0902221.1A GB0902221D0 (en) | 2009-02-11 | 2009-02-11 | Pilot |
GB0902221.1 | 2009-02-11 | ||
PCT/GB2010/050085 WO2010092364A2 (en) | 2009-02-11 | 2010-01-21 | Pilot |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110287373A1 true US20110287373A1 (en) | 2011-11-24 |
Family
ID=40527157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/143,701 Abandoned US20110287373A1 (en) | 2009-02-11 | 2010-01-21 | Pilot |
Country Status (9)
Country | Link |
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US (1) | US20110287373A1 (en) |
EP (1) | EP2396597B1 (en) |
JP (1) | JP5646513B2 (en) |
KR (1) | KR101594209B1 (en) |
CN (1) | CN102317685B (en) |
GB (1) | GB0902221D0 (en) |
SG (1) | SG172830A1 (en) |
TW (1) | TWI491838B (en) |
WO (1) | WO2010092364A2 (en) |
Cited By (3)
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WO2023287644A1 (en) * | 2021-07-13 | 2023-01-19 | Alzeta Corporation | Pilot unit |
EP4166847A1 (en) * | 2021-10-12 | 2023-04-19 | Collins Engine Nozzles, Inc. | Fuel injectors with torch ignitors |
EP4166848A1 (en) * | 2021-10-12 | 2023-04-19 | Collins Engine Nozzles, Inc. | Fuel injectors with torch ignitors |
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Also Published As
Publication number | Publication date |
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JP2012517580A (en) | 2012-08-02 |
KR20110128813A (en) | 2011-11-30 |
EP2396597A2 (en) | 2011-12-21 |
CN102317685A (en) | 2012-01-11 |
TW201033545A (en) | 2010-09-16 |
SG172830A1 (en) | 2011-08-29 |
TWI491838B (en) | 2015-07-11 |
WO2010092364A2 (en) | 2010-08-19 |
CN102317685B (en) | 2014-06-25 |
WO2010092364A3 (en) | 2011-04-07 |
JP5646513B2 (en) | 2014-12-24 |
KR101594209B1 (en) | 2016-02-15 |
GB0902221D0 (en) | 2009-03-25 |
EP2396597B1 (en) | 2020-03-18 |
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