CN208253587U - Gas burner with the rotatable central tube of flight and variable-nozzle - Google Patents

Abstract

The utility model belongs to industrial gas burner technology, specifically a kind of gas burner with flight central tube and variable-nozzle, including fixed bracket, bearing, central tube, flight, combustion chamber, variable-nozzle, stagnation body.In the present invention, the premixed gas of the compositions such as fuel gas, oxygen, carrier gas enters the burner, cyclone is formed under flight effect on central tube, then further dissipated in gas cyclone area, form more stable weak eddy flow field, by different outlet nozzles, the muzzle velocity of air-flow is also different, finally forms stagnation under the action of stagnation body at gas outlet nozzle and stablizes flame.Variable outlet nozzle is capable of forming temperature gradient height, fireballing flame under the premise of guaranteeing flame stabilization.The utility model burner is applied widely, structure is simple, strong operability, is easy to industrial amplification.

Description

Gas burner with the rotatable central tube of flight and variable-nozzle

Technical field

It is specifically a kind of to be capable of forming stable Weak cyclone stagnation fire the utility model relates to industrial gas burner technology The extremely low gas burner of flame, NOx emission.

Background technique

The main energy sources of our times are still petroleum, natural gas and coal, and exhaustion is objective by these fossil resources Urgent reality.And the energy of these forms, during releasing energy, a large amount of pollutant that invariably accompanies is formed, danger Evil atmospheric environment and human health.The means such as currently used coal gasification, although energy sheet can be reduced to a certain extent The pollutant component of body, but the NOx generated in combustion is still inevitable.Therefore, suitable combustion how is designed Burner reduces the discharge of NOx to improve combustion mode, has important academic significance and economic value.

In gas combustion technology, Lean burn combustion is a kind of technology that can effectively reduce NOx emission, but due to flame temperature Degree can be slightly lower, and air-flow is once slightly larger to be easy to cause combustion flame unstable the case where even extinguishing.

Summary of the invention

The purpose of this utility model is that design it is a kind of with stablize Weak cyclone stagnation flame, NOx emission it is extremely low gas combustion Burner improves the flame instability situation being likely to occur during Lean burn combustion.

The basic principle of the utility model is to drive flight and central tube rotation after premixed gas enters combustion chamber, from And air velocity reduces, and initially forms cyclone.Then further develop in free gas cyclone area and forms weak eddy flow field, to Lean combustion gaseous mixture in combustion chamber is enabled to stablize burning.Combustion chamber then is discharged by nozzle, if gaseous mixture has been able to Stablize burning, and wish that gas flow rate improves at nozzle, then selects negative throat noz(zle) even contraction and enlargement nozzle (Laval nozzle)；If If after forming weak eddy flow field, the flow velocity of gaseous mixture is still too fast, influences it and stablize burning, then uses divergent nozzle, further drop Low gas flow rate.After stablizing flame discharge combustion chamber, under the action of stagnation body, stable stagnation burning fire is formed at nozzle Flame.

The utility model is achieved through the following technical solutions, and the utility model includes fixed bracket, bearing, center Pipe, flight, combustion chamber, variable-nozzle, stagnation body, support bracket fastened lateral wall link together with burning cavity wall, bearing Be connected with support bracket fastened inner sidewall, fixed bracket being divided into premixed gas entrance region and eddy flow area before and after combustion chamber, in Together with bearing fit, flight is arranged on central tube for the front end of heart pipe, and variable-nozzle is arranged in the end of combustion chamber, stagnant Only body is located at the rear of variable-nozzle.

Further, in the present invention, the ratio between 4 radius of central tube and 7 radius of combustion chamber are 1/5, and central tube 4 is long Degree is 1/3 with 7 length ratio of combustion chamber.

Further, in the present invention, the ratio between 5 radius of flight and 7 radius of combustion chamber are 1/2.

Further, in the present invention, flight 5 totally 16 have four flights 5 at interval of 90 ° of directions It is mounted equidistant in 4 side of central tube, four flights 5 of same layer four direction axial progressive peace clockwise or counter-clockwise Dress, the blade angle of flight 5 are 45 °.

Further, in the present invention, variable-nozzle 8 include three kinds of forms, respectively tapering type, pantographic, Gradual-enlargement type.

Further, in the present invention, stagnation body material is heat-resisting material, relative to going out for variable-nozzle Open height is adjustable, and according to the requirement of different gas flow and outlet air flow velocity, flame height can be obtained by calculation, and adjusts Stagnation body is relative to the position of nozzle to stablize flame.Meanwhile in different applications, stagnation body itself can be fixed can also With rotation, if can then take rotation stagnation body even to take coolant liquid in stagnation body to reduce the temperature of Stagnant flame The back side carries out cooling mode.

Compared with prior art, the utility model has the advantages that are as follows: the burner is capable of forming stable Combustion flame, and take Lean burn combustion mode, pollutant emission is low, and there is no recirculating zone and structure is simple, is easy to industry puts Greatly, it can effectively promote and apply to fields such as industrial combustion furnace, gas turbines；Variable outlet nozzle is guaranteeing flame stabilization Under the premise of, it is capable of forming temperature gradient height, fireballing flame has so that outlet flame temperature is reduced suitable for certain The occasion of particular/special requirement；The toxic and harmful gas concentration such as NOx and CO of the generation conventional burners that compare substantially reduce, effectively Protect environment and human health.

Detailed description of the invention

Fig. 1 is the utility model overall structure radial direction schematic diagram；

Fig. 2 is the utility model overall structure size indication figure, wherein pipe radius centered on Ri, Ro are combustion chamber radius,

Li is center length of tube, and Lo is burning cavity length, and Rx is flight radius；

Fig. 3 the utility model overall structure axial direction schematic diagram；

Fig. 4 is the utility model center tube structure schematic diagram；

Fig. 5 is the utility model flight structural schematic diagram；

Fig. 6 is the different types of nozzle schematic diagram of the utility model；

Wherein, 1, premixed gas entrance region, 2, fixed bracket, 3, bearing, 4, central tube, 5, flight, 6, eddy flow area, 7, Combustion chamber, 8, variable-nozzle, 9, stagnation body.

Specific embodiment

It elaborates with reference to the accompanying drawing to the embodiments of the present invention, the present embodiment is with the utility model technical side Premised on case, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is not limited to down The embodiment stated.

Case study on implementation

As shown in Figures 1 to 6, the utility model include fixed bracket 2, bearing 3, central tube 4, flight 5, combustion chamber 7, The lateral wall of variable-nozzle 8, stagnation body 9, fixed bracket 2 links together with 7 inner wall of combustion chamber, bearing 3 and fixed bracket 2 Inner sidewall be connected, the front and back of combustion chamber 7 is divided into premixed gas entrance region 1 and eddy flow area 6, central tube 4 by fixed bracket 2 Front end be combined together with bearing 3, flight 5 is arranged on central tube 4, and variable-nozzle 8 is arranged in the end of combustion chamber 7, Stagnation body 9 is located at the rear of variable-nozzle 8.

In the implementation process of the utility model, the central tube 4 with flight 5 is matched with bearing 3, and bearing 3 passes through solid Fixed rack 2 is connected with combustion chamber 7, and premixed gas drives flight 5 and central tube 4 to rotate after entering burner, gas velocity It reduces, preliminarily forms cyclone.It is free gas cyclone area 6 after central tube 4, gaseous mixture further dissipates here, is formed Stable weak eddy flow field.What it is in 7 end of combustion chamber is variable-nozzle 8, according to different requirements selectively configuration different type Nozzle 8 so that combustion flame meets stability requirement and the gas rate of outflow meets design requirement.It is set at 8 rear of nozzle It is equipped with stagnation body 9, so that 8 exit of nozzle forms stable Stagnant flame.

Due to taking single bearing fixed center pipe 4, avoid that bearing radial force is uneven and axially loaded is excessive Problem, the ratio between 4 length Li of central tube and 7 length Lo of combustion chamber are set as 1/3,5 radius Rx of flight and 7 radius Ro of combustion chamber The ratio between be set as 1/2.For the rigidity for guaranteeing central tube 4, the ratio between 4 radius Ri of central tube and 7 radius Ro of combustion chamber are set as 1/5.

As shown in Figures 1 to 5,16 flights 5 are provided with altogether to keep radial symmetric as far as possible, it is equal at interval of 90 ° of directions There are 4 flights 5 to be mounted equidistant.But 4 flights 5 in 4 directions of same layer are not on same plane, but clockwise Or axial promote arranges counterclockwise.The blade angle of flight 5 is set as 45 °.

As shown in figures 1 to 6, dismountable thread connecting mode is used between combustion chamber 7 and variable-nozzle 8, is being burnt 7 end threading of chamber, in 8 straight tube end machining internal thread of variable-nozzle.Under the premise of guaranteeing Lean burn combustion flame stabilization, If it is desired to improve the gas rate of outflow at nozzle 8, tapering type even pantographic (Laval formula) nozzle should be installed, if it is desired to Air velocity is further decreased, stablizes flame, gradual-enlargement type nozzle should be installed.

As shown in Figure 1, stagnation body 9 is arranged in 8 exit of variable-nozzle, 9 material of stagnation body is heat-resisting material, opposite It is adjustable in the outlet height of variable-nozzle 8, it, can be by calculating according to the requirement of different gas flow and outlet air flow velocity To flame height, stagnation body 9 is adjusted relative to the position of nozzle 8 to stablize flame.Meanwhile in different applications, stagnation Body 9 itself can be fixed or be rotated, if can then take rotation stagnation body 9 even to reduce the temperature of Stagnant flame Coolant liquid is taken to carry out cooling mode at the back side of stagnation body 9

The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in Other related technical areas are also included in the patent protection scope of the utility model.

Claims (6)

1. a kind of gas burner with the rotatable central tube of flight and variable-nozzle, it is characterised in that including fixed bracket (2), bearing (3), central tube (4), flight (5), combustion chamber (7), variable-nozzle (8), stagnation body (9), fixed bracket (2) Lateral wall links together with combustion chamber (7) inner wall, and bearing (3) is connected with the inner sidewall of fixed bracket (2), fixed bracket (2) being divided into premixed gas entrance region (1) and eddy flow area (6) before and after combustion chamber (7), the front end and bearing (3) of central tube (4) It is combined together, flight (5) is arranged on central tube (4), and variable-nozzle (8) is arranged in the end of combustion chamber (7), stagnation body (9) it is located at the rear of variable-nozzle (8).

2. the gas burner according to claim 1 with the rotatable central tube of flight and variable-nozzle, feature exist In the ratio between central tube (4) radius and combustion chamber (7) radius are 1/5, central tube (4) length and combustion chamber (7) length ratio It is 1/3.

3. the gas burner according to claim 2 with the rotatable central tube of flight and variable-nozzle, feature exist In the ratio between flight (5) radius and combustion chamber (7) radius are 1/2.

4. the gas burner according to claim 3 with the rotatable central tube of flight and variable-nozzle, feature exist In, flight (5) totally 16, there are four flights (5) to be mounted equidistant in central tube (4) side at interval of 90 ° of directions, it is same The axial progressive installation clockwise or counter-clockwise of four flights (5) of layer four direction, the blade angle of flight (5) is 45 °.

5. the gas burner according to claim 4 with the rotatable central tube of flight and variable-nozzle, feature exist In variable-nozzle (8) includes three kinds of forms, respectively tapering type, pantographic, gradual-enlargement type.

6. the gas burner according to claim 5 with the rotatable central tube of flight and variable-nozzle, feature exist In stagnation body (9) material is heat-resisting material, and the outlet height relative to variable-nozzle (8) is adjustable.