CN1146542A - Inclinable end-split jet-flow burner assembly with washer sealing - Google Patents

Abstract

A burner assembly having an outer barrel formed into an inlet portion for receiving the fuel and a nozzle for discharging the fuel. An annular passage is provided in the nozzle through which fuel passes before being split up into a plurality of streams to produce a plurality of individual flame patterns upon ignition. The nozzle is tiltable relative to the inlet portion to enable the assembly to be utilized in multiple furnace configurations.

Description

Tiltable breach jet-flow burner assembly with washer sealing

Relate generally to burner assembly of the present invention relates more particularly to a kind of like this burner assembly, and its jet that sprays a plurality of coals and air burns in combustion furnace, and has tiltable injection portion and spray flow pattern to change.

The problem of the nitrogen oxide that causes for the burning that reduces owing to fuel arouses attention, and various effort are being carried out, particularly in the relative large-scale equipment that is associated with the application of coal such as the part of the combustion furnace in steam generator and the similar devices.In the exemplary apparatus of the fire coal in steam generator, a plurality of pulverizing jets are configured to link to each other with the inside of combustion furnace, and its motor performance is with the mixture of combustion air and pulverized coal.The pulverizing jet that is used for these equipment usually has such type, and wherein, fuel-air mixture sprays to form single big relatively flame continuously by nozzle.Its result, the surface area of comparing flame with its volume is relative little, thereby average flame temperature is high relatively.Yet in burning of coal, owing to the nitrogen that exists in the atmosphere fixing in combustion air forms nitrogen oxide, formed nitrogen oxide amount is the function of flame temperature.When flame temperature surpassed 2800 °F, index increased the amount of the stable nitrogen of removing from combustion air along with the rising of temperature.This situation will cause producing high-caliber nitrogen oxide in the final comburant, and this can cause serious air pollution problems inherent.

In view of foregoing, thereby attempted to make great efforts to suppress the formation that flame temperature in the combustion process reduces nitrogen oxide.The solution of attempting has comprised such technology: the fuel-air mixture of the burning in two last stages, fuel gas recirculation, anoxic is introduced pulverizing jet, and single big flame is broken into a plurality of less flames.Yet although these trials can produce some useful effect outstandingly, they fail to make nitrogen oxide to be reduced to floor level.

At the United States Patent (USP) NO.4 that transfers as same assignee of the present invention, in 348,170, disclosed burner assembly can significantly reduce the formation of nitrogen oxide.For reaching this point, preferably be suspended in or be blended in annular fuel jet in the primary air source with the form of pulverized coal, split into a plurality of jets in the spray end that is adjacent to pulverizing jet, and in combustion process, produced the independent flame flow pattern of a great deal of.This has caused bigger Fire Radiation, and lower average flame temperature and the gas composition holdup time in the flame of maximum temperature, all these helps to reduce the formation of nitrogen oxide.

Yet, the disclosed burner assembly of above-mentioned patent be for specific combustion furnace structure designed, thereby, the combustion furnace that its combustion furnace that is not suitable for other application-specific for example tangentially ignites.

Therefore, the objective of the invention is to propose a kind of burner assembly, whole advantages that it has disclosed pulverizing jet in the above-mentioned patent comprise the minimizing of nitrogen oxide in the fuel combustion process.

Purpose more specifically of the present invention is to propose a kind of burner assembly of the above-mentioned type, and it is applicable to multiple combustion furnace structure.

In order to finish these and other objects, pulverizing jet of the present invention comprises the circular passage, and behind this circular passage, fuel is split into a plurality of jets at the ejection end place near burner assembly, and the igniting back produces a plurality of independent flame flow patterns.The outer cylinder body of burner assembly is admitted fuel, and jet blower is tiltable with respect to outer cylinder body, so that burner assembly can be applied to comprising the combustion furnace of tangentially lighting in the multiple combustion furnace structure.

By following with reference to accompanying drawing to detailed description according to preferred exemplary embodiment of the present invention, above-mentioned brief description of the present invention and other purpose, feature and advantage will be more clear, wherein:

Fig. 1 is the part stereogram of expression according to burner assembly of the present invention;

Fig. 2 is the cutaway view along 2-2 line among Fig. 1; With

Fig. 3 is cutaway view amplification, local of a part of the burner assembly of Fig. 1.

Special in the Fig. 1 in the accompanying drawing and Fig. 2, label 10 is usually represented burner assembly of the present invention.Burner assembly 10 comprise tubular type enter cylindrical shell 12 and with this cylindrical shell 12, link to each other and below the mode of describing is formed the injection nozzle 14 of the extension that enters cylindrical shell 12.Cap 16 (Fig. 2) extends to enter an end 12a of cylindrical shell 12 always, and other end 12b is because the former thereby amplification that will illustrate.Injection nozzle 14 with enter the extension that cylindrical shell 12 links to each other and forms cylindrical shell 12.Jet blower 14 has the end 14a of the expansion of the enlarged end 12b that extends to enter cylindrical shell 12, and the other end 14b of nozzle 14 be open wide and with will the explanation mode constitute.

The interior tubular unit 18 that diameter is littler than the diameter that enters cylindrical shell 12 is extended to limit circular passage 20 in the inside that enters cylindrical shell 12.Interior element 18 and the passage 20 end 12a from cylindrical shell 12 on the partial-length of cylindrical shell 12 extends, and lid or cap 22 are arranged on the inner of interior element 18.

Conduit 24 links to each other with cylindrical shell 12 and aligns with opening 12c on the wall of cylindrical shell.Conduit is cut various places with respect to the circular passage 20 that imports fuel jet and is extended, and the pulverized coal that fuel jet preferably mixes with air enters into passage, will explain in detail as the back.

Illustrate better as Fig. 2, the direction from the end 14a of its expansion to end 14b of nozzle 14 tilts.Distribute cone 26 to be arranged in the nozzle 14 and extend to its other end 14b from the enlarging section 14a of nozzle 14.Thereby cone 26 is hollow passages 27 that define central authorities, and has in fact the gradient corresponding to the gradient of nozzle 14.Cone 26 has the circular passage 28 that limits than nozzle 14 little diameters around centre gangway 27.The entrance point of centre gangway 27 and circular passage 28 is positioned in close proximity to the expansion section 14a of nozzle 14, and their ejecting end extends to concordant with the end 14b of nozzle 14.

Four breaches 30 in circular passage 28, extend and circumferentially the compartment of terrain round the circular passage 28.Breach 30 separates with 90 ° interval, and each breach comes down to V-arrangement, separately ridge peak position in the entrance point adjacent of circular passage 28.The other end of breach 30 extends to mutually concordant with the ejecting end of the end 14b of nozzle 14 and circular passage 28.It should be noted that in fact, nozzle 14 can be annotated on the body member that comprises cone 26 and breach 30 by mould, as the United States Patent (USP) that transfers assignee of the present invention asks the 097th, 574 like that, its disclosed content is hereby expressly incorporated by reference.

Although illustrate in the drawings for convenience of description and not, it should be understood that on the nozzle 14 a plurality of holes can be set enters the US-4 that circular passage 28 di sopras are mentioned so that import auxiliary air, reach described such shown in 348,170.

Referring to Fig. 3, the expansion section 12a of cylindrical shell 12 links to each other with the expansion section 12a of nozzle 14 by the washer sealing assembly of usually representing with reference number 32.Black box 32 is against the end that enters element 12 and the corresponding inner surface portion that penetrates element 14, and the sealing assembly is made of annular engaged element 34 and ring frame element 36.Frame element 36 has the U-shaped cross section and is curled into round the part of the inside of engaged element 34, and frame element 36 is to be fixed on the cylindrical shell 12 with any known mode such as welding.

By a pair of arm 40a (Fig. 1) on the radially opposed outer surface that is installed in nozzle 14 respectively and 40b (Fig. 2), nozzle 14 is tiltable with respect to cylindrical shell 12.The extension flatly that arm 40a and 40b go out as shown in Figure 1, and be installed on and can produce on the link gear that moves up and down, nozzle can be pivoted around axis A.This link gear is by the U.S. Patent application of 9,94 on Augusts application that transfers assignee of the present invention (trustee's case number be 10283.401) full disclosure, and its disclosed content is hereby expressly incorporated by reference.Being regulated by washer sealing assembly 32 around the pivot of axis A or banking motion of nozzle 14, the sealing assembly also plays a part sealing to prevent any leakage of fuel/air mixture.

Although do not illustrate in the accompanying drawings, be appreciated that in use the through hole that burner assembly 10 should be configured to and be formed on the antetheca of traditional combustion furnace axially aligns, this combustion furnace has the combustion chamber of next-door neighbour's through hole.In most equipment, also be provided with similar opening on the antetheca of combustion furnace to be applicable to other burner assembly identical with burner assembly 10.And, also be provided with bellows and one or more air nozzle so that import extra or auxiliary air enters into combustion furnace, as above-mentioned U.S. Patent application (trustee's case number 10283.401) is disclosed.Will also be understood that the igniter (not shown) can be arranged to be adjacent to the exit of assembly 10, coal is lighted when nozzle penetrates with convenient coal.Because igniter has traditional design, they do not illustrate in the drawings for clarity.

In the running of burner assembly 10, the fuel preferably coal of powdered form suspends or is entrained in the primary air source, fuel is directed into the conduit 24 from external source, and enters the inside of cylindrical shell 12 by conduit, and twisted-plumes of fuel formula ground is by circular passage 20 in cylindrical shell 12.Because pulverized coal is heavier than air, under the action of centrifugal force that is produced, pulverized coal will trend towards moving radially outwardly towards the inwall of cylindrical shell 12.The jet of coal and air enters the inside of nozzle 14 from the inside of cylindrical shell 12, as the result of above-mentioned centrifugal force, and the part of part that jet comprises relatively large coal and relative less air.Jet enters subsequently and is limited to the outer ring passage 28 between nozzle 14 and the distribution cone 26 and collides breach 30.Like this, jet is split into four strands of equally spaced jets, and it is from being penetrated by the outlet that the end limited separately of penetrating element 14 and cone 26.

Like this, after the igniting, four strands independently the flame flow pattern just formed, their extend the inside enter above-mentioned combustion furnace.Another jet is formed by the remainder of the air-coal mixtures of the centre gangway 27 that penetrates element 14 towards flowing through of central authorities, and this mixture comprises primary air.Back one jet is again from being penetrated by the end of the nozzle 14 that is surrounded by the flame flow pattern of circular passage 28 ejaculations.Nozzle 14 can tilt to change the angle of emergence of flame flow pattern with respect to the combustion furnace opening by the action of arm 40a and 40b.

In case burning reaches stable state, igniter promptly cuts out, and is understandable that auxiliary air can be with above-mentioned patent NO.4, and 348,170 described modes import in the flame flow pattern.

Can derive lot of advantages by foregoing.For example, the setting of a plurality of flame types has caused bigger Fire Radiation, has reduced average flame temperature, the gas composition short holdup time in the flame of maximum temperature, and all these helps reducing the formation of nitrogen oxide.And, the setting of leading to the tangential entry of passage 20 provides the well distributed of fuel, can cause and burn more completely and carbon loss is reduced, thus make than other may with the use of pulverizing jet with independent pulverizing jet of obviously higher productivity ratio become possibility.In addition, nozzle 14 can tilt or pivot to adapt to different combustion furnace structure and needs with respect to entering element 12 before operation.

Be appreciated that within the scope of the invention and can make various distortion and additional foregoing.For example, device of the present invention allows the soakage of air to lack than stoichiometry, so that during completing combustion, overfire air spout or similar structures can be set when needs supply air.

To those skilled in the art, obviously can make various variations and change shape and the spirit and scope of the present invention that do not break away from claim and legal equivalents and limited embodiments of the invention.

Claims (8)

1, a kind of burner assembly comprises the element that enters that is used for admitting fuel; With the described ejaculation element that element is connected and forms the extension that enters element that enters that is used to admit described fuel; Be arranged on to penetrate in the element and described ejaculation element be divided into centre gangway and around the distribution member of the circular passage of described centre gangway, thereby, enter into described centre gangway and another part enters the circular passage from the part of the described fuel that enters element; The device that combines with described circular passage, when fuel when described ejaculation element ejects, it splits into multiple jets with described fuel jet by the circular passage, thereby, light described fuel after, formed a plurality of flame types; And be used for making the ejaculation element to enter the device that element tilts with respect to described, and change the jet angle of described flame type with respect to the described axis of element in described.

2, burner assembly as claimed in claim 1, wherein, described mitotic apparatus comprises a plurality of V-type elements, this V-arrangement element circumferentially extends in described circular passage at intervals, and each element the ridge peak facing to the upstream, and the described element of described fuel jet percussion in the described circular passage, this element guides described jet to enter described interelement space.

3, burner assembly as claimed in claim 1 also is included in the described interior qualification circular passage of element that enters to admit the device of described fuel.

4, burner assembly as claimed in claim 3, wherein, described fuel supply device comprises such device, and this device guiding fuel is along entering the circular passage with respect to the described tangential direction that enters the circular passage of element.

5, a kind of burner assembly comprises the element that enters that is used for admitting fuel; With the described ejaculation element that element is connected and forms the extension that enters element that enters that is used to admit described fuel; Be arranged on to penetrate in the element and described ejaculation element be divided into centre gangway and around the distribution member of the circular passage of described centre gangway, thereby, enter into described centre gangway and another part enters the circular passage from the part of the described fuel that enters element; And one or more breaches that are arranged in the described circular passage, when fuel when described ejaculation element ejects, this breach will split into multiple jets by the fuel jet of described circular passage, thereby, after lighting described fuel, formed a plurality of flame types, described ejaculation element is tiltable with respect to the described element that enters, to change the jet angle of described flame type with respect to the described axis of described element.

6, burner assembly as claimed in claim 5, wherein, have a plurality of described breaches, each breach comprises the V-arrangement element that has towards the ridge peak of upstream, described breach extends with circumferential spaced apart relation in described circular passage, thereby the described element of described fuel percussion in the described circular passage, this element divides described jet and guides the jet of described division to enter described interelement space.

7, burner assembly as claimed in claim 5 wherein, describedly enters the form that element is a cylindrical shell, and comprises the tubular unit that is arranged in the described cylindrical shell, and limits the circular passage that is used to admit described fuel.

8, burner assembly as claimed in claim 7, wherein, described fuel supply device comprises the device that fuel is guided to one circular passage, back along the tangential direction with respect to described back one passage.

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