CN206055618U - A kind of fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor - Google Patents

Abstract

The utility model discloses a kind of fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor, belongs to gas-turbine unit technical field.Which includes front end system, air inlet section, linkage section, construction section, hydrocyclone system, compressing member；System is using the fuel-displaced fuel feed mode of multiple spot oil-feed multiple spot, in order to avoid in each pipeline, fuel shunts uneven defect, fuel front end manostat can be adopted, which uses two vacuum tanks, carry out pre- storage and voltage stabilizing, it is ensured that the entrance of fuel is in stable condition, secondly the common six roots of sensation of air inlet pipe is in the distribution symmetrical above and below of foursquare plane, ensure which is uniform for the shunting of each Fuel Injector Bar, to realize the homogeneous air-fuel mixture of each point.The poor oil firing of each estimated point of experiment is realized after adjusting fuel flow rate, relatively low pollutant emission is realized.The local fuel-rich combustion that the fuel-displaced design of single-point oil-feed multiple spot causes the fuel flow at each nozzle different and causes can be solved, the temperature distributing disproportionation phenomenon caused because system design is unreasonable is eliminated.

Description

A kind of fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor

Technical field

This utility model is related to a kind of fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor, belongs to combustion gas whirlpool Turbine technical field.

Background technology

Nowadays aero-engine also requires less air pollution emission simultaneously when higher and higher efficiency is pursued.And High efficiency means the bulk temperature for improving engine chamber, the highest temperature for reducing then with reduction combustor of pollutant emission Degree is directly related.Pursue high efficiency and reduce the contradiction that pollutant emission is often given tit for tat.And in the row of various pollutant In putting, Nox（Nitrogen oxides）Reduction it is of greatest concern.Burning generates the reactant in the chemical reaction rate and combustor of Nox Maximum temperature exponentially functional relationship, even if burning it is indoor to reach maximum temperature interval extremely short, can also produce substantial amounts of Nox.Low oil-gas ratio poor oil firing as one of the conventional means for reducing Nox, wherein prospect it is the most wide be it is oil-poor directly Spraying technique.

Oil-poor lean direct injection technology（LDI）Combustion zone is injected directly into exactly by fuel in the way of oil-poor to mix with air Close and directly burn, the flame temperature of poor oil firing is low, and the generation of Nox can be greatly reduced.And in order to eliminate the local in combustor High-temperature region, poor oil firing require that fuel and air are blended well before combustion.Therefore, LDI requires the homogeneous of fuel Blending, is to realize this condition, and the combination of multiple air-fuel mixture units is used LDI more.

As the low pollution combustor concept of great prospect, substantial amounts of grinding is carried out to the combination of LDI multiple-units all both at home and abroad Study carefully.Also pluralities of fuel supply and spraying system scheme are generated.Such as United States Patent (USP)<multi-point fuel injection module>(the patent No.：6959695B2) with《fuel trim system for a multiple chamber gas turbine combustion system》.A kind of fuel injection device of multiple spot of former conceptual design, which adopts single pole Single-point oil-feed, 4 points of fuel-displaced modes, but enter oil drop and be not on out at the mean place of oil drop.This locus distribution It is uneven, the shunting of fuel and each last oil gas equivalent gone out at oil drop can be caused than different, distal end oil-gas ratio is relatively low, Near-end is then higher.And latter scheme be Aeroengine Design it is a kind of enter fuel scheme, main combustion stage is with pre-combustion grade Single-point oil-feed, the fuel-displaced mode of multiple spot.Two kinds of structures have used single-point oil-feed-fuel-displaced fuel system of multiple spot, what which caused The indoor petroleum distribution of burning is uneven to cause combustion chamber thermograde big, and the problem that the thermal stress of combustor is excessive may Shorten the life-span of combustor.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of uniform injection system for oil-poor direct-injection combustor System, the system not only can realize the multi-point injection of fuel, and the gas mixture for entering burning interior can be caused uniform Unanimously, make burning fully efficient, while reducing the discharge of pollutant.

In order to solve above-mentioned technical problem, this utility model provides a kind of fuel multiple spot for oil-poor direct-injection combustor Uniform spraying system, oil-poor direct-injection combustor therein include the air inlet section being sequentially connected, construction section and combustion chamber body; The system is uniformly arranged several swirler assemblies on the normal plane of construction section axial direction, and each swirler assembly is literary by one The axial swirler composition that family name manages and one is arranged in Venturi tube, is flow through from Venturi tube by air inlet section leaked-in air And acted on by axial swirler and form rotational flow air；The main shaft of axial swirler is hollow, and the spray boom for being input into fuel penetrates this In main shaft, hole array is being provided with the axial normal plane at the top of spray boom, fuel is sprayed from aperture, in Venturi tube The combustion chamber body that rear portion is entered after rotational flow air mixing burns.

As improvement, if the axial swirler is fixed on spindle outer wall face system into the blade at inclination angle by dry tablet and main shaft Into the hole array on spray boom is located between blade and Venturi tube venturi.

Used as further improving, the swirler assembly is installed on construction section using nine lattice array modes.

In order to improve the uniformity of fuel input, the spray boom can be connected with a fuel injection device, and the fuel sprays Injection device includes front end manostat, linkage section, air inlet pipe and transition conduit；If front end manostat will be the fuel input of voltage stabilizing arranged side by side Dry root air inlet pipe, each air inlet pipe pass through in advance inside the perforate air inlet air inlet section on air inlet section wall, air inlet pipe Seal between perforate；Transition conduit two ends are respectively protruding in the groove of linkage section both sides；Groove is in installation air inlet pipe and mistake Pipe rear enclosed is crossed, transition conduit is crossed with air inlet pipe in groove cavities, complete fuel transport, in linkage section outline and construction section The form fit of portion's step surface is realized installing positioning；Spray boom one end is connected in transition conduit makes combustion gas enter into spray boom from transition conduit It is interior.

Preferably, the diameter of the hole array on spray boom is in 1mm ~ 5mm, and with the angle of inclination of axial direction 0 ~ 75 degree it Between.

Above-mentioned front end manostat includes the first fuel gas source of the gas, the second fuel gas source of the gas, first pressure table, the second pressure Power table, the 3rd pressure gauge, the first vacuum tank and the second vacuum tank, the first gate valve, the second gate valve, choke valve；Fuel flow meter group Into；Wherein first and second fuel gas source of the gas respectively hangs oneself corresponding first, second pressure gauge and, the second gate valve is connected to One vacuum tank is importing fuel gas；First vacuum tank rear end is sequentially connected choke valve, the 3rd pressure gauge, fuel flow meter extremely again Second vacuum tank, the second vacuum tank escape pipe quantity are corresponding with the air inlet pipe quantity of fuel injection device, and are connected with each other.

Preferably, the second vacuum tank escape pipe quantity is the six roots of sensation with the air inlet pipe quantity of fuel injection device.

Used as further improving, four outside wall surfaces of combustion chamber body are provided with square opening, and quartzy glass is installed in the wherein left and right sides Glass makees observation window, and the square opening of top places ignition electric nozzle attached plate, and the square opening of lower section places flame temperature sensor attached plate.

This utility model is had the advantage that compared with other fuel injection systems：

1st, the swirler assembly of Venturi tube and axial swirler composition is employed, improve that fuel mixed with air is uniform Property, air inlet pipe and matched swirler assembly it is symmetrical on axial normal plane, it is ensured that its for each spray boom point Stream is uniform, to realize the homogeneous air-fuel mixture of each point, makes burning more abundant, realizes relatively low pollutant emission.

2nd, the spout of spray boom is close at the venturi of Venturi tube cyclone and fuel emission direction and air direction of flow are basic Vertically, it is ensured that fuel is sufficiently mixed with air, improves combustibility；

3rd, the fuel transport of transition conduit and air inlet pipe is completed in the closed groove of linkage section, and the system of enormously simplify sets Meter, and linkage section and construction section, by step cooperation, the mode of mode connects for screw is realized and is accurately positioned.

4th, increased fuel manostat, using two fuels sources come in the case of ensureing fuel flow rate, it is steady using two Pressure tank causes steady flow is close in fuel flowing, greatly reduces the non-stationary flow of the fuel that two fuels sources are likely to result in It is dynamic, optimize the jetting stability and uniformity of fuel.

Description of the drawings

Fig. 1 directly sprays low emission combustor structural representation for oil-poor, and including fixed plate 10, quartz glass 9 is purple Copper backing 8, air inlet section suction flange 1, air inlet section 15, air inlet section outlet(discharge) flange 2, linkage section 3, construction section enters Mouth flange 14, construction section 13, construction section outlet(discharge) flange 12, swirler assembly 4, compressing member 5, combustor suction flange 11, burning Room body 6, combustor exit flange 7；

Fig. 2 is construction section front portion structure schematic diagram, including construction section boss 16；

Fig. 3 is the structural representation inside construction section, installs cyclone circular hole 17 including construction section, in construction section Portion's step surface 18, screwed hole 19；

Structural representations of the Fig. 4 for fuel injection system rear portion, including fuel air pipe 26, nut 24, nut 25, Linkage section screwed hole 23, fuel transition conduit 22, step 20 in groove, groove 21；

Fig. 5 is the anterior structural representation of fuel injection system；

Fig. 6 is temperature sensor attached plate（It is left）With ignition electric nozzle attached plate（It is right）Structural representation, including sparking plug spiral shell Keyhole 28, screwed hole 64, fixed plate boss 65, sparking plug hole 29, temperature sensor putting hole 28,

Structural representations of the Fig. 7 for Venturi tube cyclone, including cyclone outer face step surface 31, swirler blades 32, cyclone air flow channel 33, main shaft 34, cyclone outer face step 35, Venturi tube 36；

The assembly relation of Fig. 8 Venturi tube cyclones shows；

Structural representations of the Fig. 9 for combustor head；

The structural representation at Figure 10 combustor rear portion, including combustor A faces 42, fixed plate 39, quartz glass 40, Red copper pad 41, combustor exit bolt hole 44, combustor B faces square holes step 43；

Structural representations of the Figure 11 for air inlet section, including air inlet section left end flange 1, air inlet pipe welding section 48, admission line right-hand member end face of flange 51, transition conduit outside wall surface, bolt hole 45, spray boom 46；；

Figure 12 is the structural representation of the first vacuum tank,.

Structural representations of the Figure 13 for vacuum tank b,

Conceptual schematic views of the Figure 14 for fuel system.

Specific embodiment

This utility model is further described below in conjunction with accompanying drawing.

As shown in Figure 1, Figure 2, shown in Fig. 3, Figure 11, oil-poor direct-injection combustor mainly includes connecting successively including oil-poor direct-injection combustor The air inlet section 15 for connecing, construction section 13 and combustion chamber body 6.Wherein air inlet Duan Weiyi square-sections air intake duct, air 13 both side ends of air inlet section are provided with air inlet section suction flange 1 and air inlet section outlet(discharge) flange 2 respectively, and air inlet section is entered The mouth connection upstream air incoming flow pipe of flange 1 road；The equal perforate of lower wall surface in air inlet section, by welding with air inlet pipe outside wall surface 48 Fixed air inlet pipe 28.A boss 47 is designed with air inlet section outlet(discharge) flange 2, to coordinate with downstream construction section 13, and is risen To sealing function；The end face of flange of air inlet section outlet(discharge) flange 2 is first welded together with the outside wall surface of air inlet section 15, then It is bolted the suction flange 14 of downstream construction section 15；13 interior step face 12 of construction section is contacted with 3 right side of linkage section, And realize connection with positioning by the connection of screw 19；The circular hole 17 of the processing coldest days of the year end lattice array of construction section 13 is to install and position rotation Stream device is wherein a step surface at internal face to coordinate to position cyclone with the step surface 22 of 4 outside wall surface of swirler assembly Component 4；On the right side of construction section, wall designs a boss 18, to place compressing member 5 and in the connection of downstream combustion chamber body 6 Coordinate with step 38 and seal.The correspondence processing coldest days of the year end lattice array circular hole of compressing member 5 is coordinated with swirler assembly 4, in corner And center corner processes screwed hole to connect construction section and position cyclone.

Such as Fig. 1, Fig. 6, Fig. 9, Figure 10, combustion chamber body 6 is respectively arranged at two ends with combustor suction flange 11 and combustor goes out Mouth flange 7；Combustor suction flange 11 is connected with construction section by bolt, and which opens square opening in four outside wall surfaces, and left and right face is used Make observation window to install quartz glass, step processed on hole with positioning quartz glass 9, attaching red copper pad 8 is sealed on ladder, Fixed plate 10 is connected with mode connects for screw 42 to compress quartz glass 9 with combustion chamber body 6 afterwards；On B faces, opening square hole places igniting Sparking plug attached plate 30, perforate thereon 29 place ignition electric nozzle；On D faces, opening square hole places flame temperature sensor attached plate 27, opens thereon Place temperature sensor in hole 28；Square hole working on B, D face goes out ladder to fix sparking plug and sensor attached plate, and places asbestos pad Piece is sealed, respectively by being threadedly connected to combustion chamber body 6；Combustor exit flange 7 connects downstream exhaust gas by bolt 44 and collects Section, outlet tail gas is entered in exhaust collection section.

As shown in Figure 4 and Figure 5, fuel injection system is mainly by escape pipe 55, air inlet pipe 26, transition conduit 22, Fuel Injector Bar 46 Composition；Escape pipe 55 is copper pipe, and the gas circuit consisted of six roots of sensation copper pipe derives fuel to air inlet pipe 26, and each pipeline adopts spiral shell Female 24 connect；Air inlet pipe 26 by advance inside the perforate air inlet air inlet section 15 in air inlet section 15, and by outer wall Face 48 is welded in the outside wall surface of air inlet section；22 two ends of transition conduit each extend in the groove 21 of the Ge Kai up and down of linkage section 53 and incite somebody to action Its outside wall surface 51 is welded on 3 inwall wall of linkage section；Its further groove 21 is in installation air inlet pipe 26 and the peace of transition conduit 22 After dress, one iron plate of welding is being sealed against on step 20 in groove, and transition conduit 22 is crossed in 21 cavity of groove with air inlet pipe 26, Complete fuel transport.Linkage section 53 and changeover portion are fixed by nut 25.46 one end of spray boom be welded in transition conduit 22 make combustion gas from Transition conduit 22 is entered in spray boom 46；46 one end of Fuel Injector Bar is in truncated cone-shaped, on the axial normal plane at top is opening a series of Circular array aperture 37 so that fuel can be sprayed from hole 37, burnt into combustor 6 after mixing with rotational flow air；

As shown in Figure 12 to Figure 14, this utility model is also provided with fuel front end to improve the stability of fuel penetrating Manostat, fuel front end manostat mainly include the first fuel gas source of the gas 56, the second fuel gas source of the gas 57, first pressure table 58th, second pressure table 59, the 3rd pressure gauge 65, the first vacuum tank 62 and the second vacuum tank 67, the first gate valve 60, the second gate valve 61st, choke valve 64 and fuel flow meter 66 are constituted；Wherein first and second fuel gas source of the gas 56,57 respectively hangs oneself corresponding First, second pressure table 58,59 and, the second gate valve 60,61 are connected to the first vacuum tank 62 to import in fuel gas tank；First 62 rear end of vacuum tank is sequentially connected choke valve 64, the 3rd pressure gauge 65,66 to the second vacuum tank 67 of fuel flow meter again, and second is steady Pressure tank 67 escape pipe, 55 quantity are corresponding with 26 quantity of air inlet pipe of fuel injection device, and are connected with each other.Vacuum tank and fuels sources Connection, imports fuel to tank, then imports fuel to air inlet pipe 26 by six escape pipes 55 on body, and wherein source of the gas is led to single tube Cross hose connection, clip is fixed and sealed；Escape pipe 55 is copper pipe, derives fuel gas extremely by the gas circuit that six roots of sensation copper pipe is constituted Air inlet pipe 26, each pipeline are connected using nut.

As shown in Figure 7 and Figure 8, swirler assembly 4 is installed on construction section 13 using nine lattice arrays, by circular hole internal step Ladder 18 and compressing member 5 coordinate to realize positioning with the ladder 31,35 of the outer face of swirler assembly 4.Swirler assembly 4 is Wen Pipe cyclone, is made up of an axial swirler 34 and a Venturi tube 36；Wherein axial swirler by six with main shaft into one The blade 32 of angle is welded in 34 outside wall surface of pipeline composition air inner flow passage 33 so that the air rotation flow through, and then produces back Flow area to ensure flameholding；Sprayed after fuel is quickly blended with air by spout 37 at Venturi tube venturi and fired into combustion zone Burn.

This utility model causes cyclone outlet jet more uniform by the pre- storage and multiple spot air inlet of air inlet gas bomb, The poor oil firing of each combustion zone of combustor is realized in maximization, make experimental result will not produce because design problem occur it is huge Error.Theoretical model is as follows：

Hypothesis is low speed cold conditions steady flow by the flowing of groove to spout, therefore thinks that fuel can not be pressed, and three mistakes The flow field crossed in pipe is identical, and journey loss, and thermal insulation of flowing are only considered along in flowing symmetrical above and below of flowing.Taking static pressure in groove is P0, first spray boom import static pressure is p1, and second spray boom import static pressure is p2, spray boom outlet back pressure pb, unit in transition conduit Length linear loss is px, and in spray boom, linear loss is pl, and spray boom inlet velocity is respectively v1i, and v2i, muzzle velocity are respectively v1o,v2o,

Row are imported and exported for spray boom and writes energy equation：

Spray boom 1：

Spray boom 2：

Linear loss is write for arranging along transition conduit

Row write continuity equation：

Because inlet velocity V1i is less with V2i, therefore V1i=V2i=0 is thought, it is more than solution various to obtain：

V1o-V2o=

After estimation, two spray boom difference in flow away from magnitude are, gap very little illustrates that its fuel flow rate distribution ratio is more uniform.

Before the experiments, after all valves and effusion meter are closed in inspection determination front end system, first turn on fuel gas source Manometric valve, then two gate valves 60,61 before the first vacuum tank 62 are opened, allow fuel to enter the first vacuum tank by gas circuit 61,58,59 registration of observation bleed pressure table, after two pressure gauge registration stable and consistents, opens choke valve 64 to maximum so that combustion , by gas circuit, 65 registration of the 3rd pressure gauge observed before fuel flow meter 66 can the regulation combustion of turn-on flow rate meter after which is stable for material Stream amount causes fuel to enter the second vacuum tank 67.It is little by the circular array of spray boom head with air inlet pipe 46 by escape pipe 55 again Hole 37 sprays and is mixed into combustion chambers burn with air.If finding to adjust effusion meter in experimentation, maximum stream flow can not meet During experiment condition, scalable fuel gas source pressure gage valve increases outlet pressure, improves flow.

This utility model concrete application approach is a lot, and the above is only preferred implementation of the present utility model, should Point out, for those skilled in the art, on the premise of without departing from this utility model principle, can also make Go out some improvement, these improvement also should be regarded as protection domain of the present utility model.

Claims (8)

1. a kind of fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor, the oil-poor direct-injection combustor include connecting successively The air inlet section for connecing（15）, construction section（13）And combustion chamber body（6）;Characterized in that, the fuel Multipoint Uniform injection System is in construction section（13）Several swirler assemblies are uniformly arranged on axial normal plane（4）, each swirler assembly（4) by One Venturi tube（36）Venturi tube is arranged on one（36）In axial swirler composition, by air inlet section（15）Flow into Air is from Venturi tube（36）In flow through and acted on by axial swirler and form rotational flow air；The main shaft of axial swirler is hollow, uses In the spray boom of input fuel（46）Penetrate the main shaft（34）In, near spray boom（46）Array is provided with the axial normal plane at top Aperture（37）, fuel is from aperture（37）Middle ejection, enters the combustion chamber body at rear portion after mixing with the rotational flow air in Venturi tube （6）Burning.

2. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 1, it is characterised in that If the axial swirler by dry tablet and main shaft into inclination angle blade（32）It is fixed on main shaft（34）Outside wall surface is made, spray boom（46） On hole array（37）Positioned at blade（32）Between Venturi tube venturi.

3. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 1 and 2, its feature exist In the swirler assembly（4）Construction section is installed on using nine lattice array modes（13）.

4. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 1 and 2, its feature exist In the spray boom（46）It is connected with fuel injection device, the fuel injection device includes fuel front end manostat（85）, linkage section （3）, air inlet pipe（26）And transition conduit（22）；The fuel of voltage stabilizing is input into some air inlet pipe arranged side by side by front end manostat（26）, Each air inlet pipe（26）By in advance in air inlet section（15）Perforate air inlet air inlet section on wall（15）Inside, air inlet pipe （26）Seal between perforate；Transition conduit（22）Two ends are respectively protruding into linkage section（3）The groove of both sides（21）It is interior；Groove（21） Installation air inlet pipe（26）With transition conduit（22）Rear enclosed, transition conduit（22）With air inlet pipe（26）In groove（21）Hand in cavity Converge, complete fuel transport, linkage section（3）Outline and construction section（13）Interior step face（18）Form fit realize installing fixed Position；Spray boom（46）One end is connected to transition conduit（22）On make combustion gas from transition conduit（22）Enter into spray boom（46）It is interior.

5. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 1 and 2, its feature exist In spray boom（46）On hole array（37）Diameter in 1mm ~ 5mm, and with the angle of inclination of axial direction between 0 ~ 75 degree.

6. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 4, it is characterised in that Fuel front end manostat includes the first fuel gas source of the gas（56）, the second fuel gas source of the gas（57）, first pressure table（58）, Two pressure gauges（59）, the 3rd pressure gauge（65）, the first vacuum tank（62）With the second vacuum tank（67）, the first gate valve（60）, second Gate valve（61）, choke valve（64）And fuel flow meter（66）Composition；Wherein first and second fuel gas source of the gas is respectively hung oneself correspondingly First, second pressure gauge（58、59）And, the second gate valve（60、61）It is connected to the first vacuum tank（62）To import gaseous state combustion Material；First vacuum tank（62）Rear end is sequentially connected choke valve again（64）, the 3rd pressure gauge（65）, fuel flow meter（66）To second Vacuum tank（67）, the second vacuum tank（67）Escape pipe（55）The air inlet pipe of quantity and fuel injection device（26）Quantity correspondence, and It is connected with each other.

7. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 6, it is characterised in that Second vacuum tank（67）Escape pipe（55）The air inlet pipe of quantity and fuel injection device（26）Quantity is the six roots of sensation.

8. the fuel Multipoint Uniform spraying system for oil-poor direct-injection combustor according to claim 1 and 2, its feature exist In combustion chamber body（6）Four outside wall surfaces are provided with square opening, and wherein left and right sides installation quartz glass makees observation window, top Square opening places ignition electric nozzle attached plate（30）, the square opening placement flame temperature sensor attached plate of lower section（27）.