CN202532469U - Coal dust airflow guide vane set for combustor - Google Patents

Abstract

The utility model discloses a coal dust airflow guide vane set for a combustor, which is disposed in a combustor and comprises at least two guide vanes. The guide vanes are circumferentially arranged in the combustor, and a gap is provided between two guide vanes. The technical scheme is that a guide vane set for coal dust airflow is disposed in the combustor; the guide vane set can conduct grading on the airflow of primary air coal dust; as a gap is provided between two guide vanes, the coal dust airflow can flow through the gap between the vanes. Accordingly, the blending of ignited coal dust and unignited coal dust in the combustor can be reinforced; backflow and entrainment of high-temperature smoke can be reinforced; more coal dust is heated; success rate of igniting is increased and combustion effect is stabilized.

Description

The breeze airflow guide vane group that a kind of burner is used

Technical field

The utility model belongs to the thermal boiler field, relates to the burner annex of boiler, relates in particular to the breeze airflow guide vane group that a kind of burner is used.

Background technology

The mode that traditional station boiler igniting is generally adopted is a grease gun igniting.First some oil combustion gun during boiler ignition start, oil behind the burning certain hour are heated to burner hearth the ignition temperature of breeze airflow in burner hearth, be blown into burner hearth with coal dust and carry out oily coal multifuel combustion this moment.When boiler reaches more than 50% load, when breeze airflow can smooth combustion, fuel oil is excised gradually, accomplish the boiler ignition start process.In order to practice thrift cost, reduce the fuel oil consumption of station boiler, lot of domestic and international company has developed multiple plasma non-oil ignition burner and little oil mass start-up burner, and on a lot of station boilers, is widely used.

Plasma non-oil ignition burner and little oil mass start-up burner all are a kind of internally fired devices, and the high-temperature flue gas that is produced by the atomized fuel burning back of the high-temperature plasma of plasma generator ejection and the ejection of little oil mass igniter respectively comes direct firing coal-dust airflow as incendiary source.Owing to the lower-powered reason of plasma generator and the purpose of little oil mass igniter fuel-economizing; Existing plasma non-oil ignition burner and little oil mass start-up burner all are designed to the burner of fractional combustion; Promptly in burner, light the part coal dust by two kinds of above-mentioned extraneous incendiary sources; Form new, the bigger incendiary source of thermal power, remove to light other a part of coal dust again, form another bigger incendiary source; Finally adopt the mode of this " multistep ignition, amplification step by step ", light whole wind breeze airflows of main burner.So interior mechanism or the structure Design quality that breeze airflow is carried out classification of burner directly lighted very key of a wind breeze airflow success or not for above-mentioned extraneous incendiary source.

Existing fractional combustion device is inner, adopts the hierarchy of metal thin-wall cylinder more.Blending can only take place in breeze airflow of having lighted and unlit breeze airflow in the cylinder exit, the length of cylinder and radius can only be confirmed through test and experience, cause the bad adaptability to different coals.

The utility model content

The purpose of the utility model is the breeze airflow guide vane group that provides a kind of burner to use, can realize the mode of " multistep ignition, amplify step by step ", and can improve the success rate of igniting and the effect of smooth combustion.

In order to achieve the above object; The utility model adopts following technical solution to be achieved: the breeze airflow guide vane group that a kind of burner is used, be arranged in the burner, and comprise at least 2 guide vanes; To layout, there is the gap in the burner inner loop in guide vane between the guide vane.The present technique scheme; In the burner internal placement guide vane group of breeze airflow; The guide vane group can be carried out classification to a wind breeze airflow; The high-temperature flue gas that the atomized fuel burning back of the high-temperature plasma of plasma generator ejection or the ejection of little oil mass igniter produces is lighted wind breeze airflow of a part in the space that breeze airflow guide vane group is comprised; And form new, stable, the bigger incendiary source of thermal power at the end outlet of vane group, light a remaining wind breeze airflow.Again owing to have the gap between the blade in this guide vane group; Breeze airflow can be through the Clearance Flow between the blade; Strengthened the blending of firing coal-dust and unignited coal dust of burner inside; Strengthen the backflow of high-temperature flue gas and entrainmented, more coal dust is heated, improved the success rate of igniting and the effect of smooth combustion.

Be connected with movable guide rod on the guide vane, movable guide rod is used for that each guide vane is delivered to the burner middle part and forms the guide vane group.When burner used as start-up burner, one group of blade pushed burner simultaneously, and the breeze airflow in the burner is carried out classification, adopted the extraneous incendiary source that provides " igniting step by step, classification are amplified " mode firing coal-dust airflow; When treating that this burner uses as main burner, remove extraneous incendiary source, at this moment the guide vane group of breeze airflow can be remained stationary and continued also can from burner, extract out the breeze airflow classification, breeze airflow is not carried out classification.

N breeze airflow guide vane (digital N >=2) is axle with the burner center line, and hoop is arranged, constituted a vane group.The special case situation of vane group is for including only a blade in this group, this blade is the drum of opening, and shape of cross section is English alphabet " C " shape.The quantity of guide vane is preferably 4 ~ 6.

Movable guide rod also radially pierces into burner along the radial arrangement of burner, and it is radially movable to drive guide vane, and guide vane has the radius of curvature identical with burner inner wall.The guide vane of breeze airflow is long and narrow crooked arc shape, and the planar development of crooked cambered surface is shaped as rectangle, parallelogram, trapezoidal or other geometric shapes.The radius of curvature of the curved edges of the guide vane of breeze airflow is an optimum value with the radius of curvature of burner nozzle.The special case situation of breeze airflow guide vane is planar rectangular, plane parallel quadrangle, planar trapezoidal or other geometric shapes.During igniting, movable guide rod is delivered to the burner middle part with guide vane and is formed the guide vane group, and igniting when treating that this burner uses as main burner, can be close to burner inner wall by extraction activity guide rod to guide vane after accomplishing.

Movable guide rod is axial arranged along burner, and from the axial insertion burner of burner, it is axially movable to drive guide vane.

This vane group is an axle with the burner center line, and hoop is arranged, can surround the solid space of (or approximate encirclement) shape such as prism, cylinder, Rotary-table or other geometric shapes, the coaxial layout of this solid space and burner.

Blade in this group can be the center of circle with some point respectively, moves back and forth mode with circular arc, and rotation is inserted burner or is drawn to blade and is close to till the burner inner wall.

The utility model has the advantages that: through to the coal dust classification mechanism of burner inside or the improvement and the optimization of structure; Strengthened the blending of firing coal-dust and unignited coal dust of burner inside in burner inside; Strengthened the backflow of high-temperature flue gas and entrainmented; Set up stable high temperature gases recirculating district, strengthen lighting and steady combustion effect of breeze airflow.The utility model, notion is distinct, and is simple in structure, reasonable in design, and investment and operating cost are moderate, and cost performance is high.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed description.

Fig. 1 is the plasma non-oil ignition fractional combustion device sketch map of embodiment 1 and 2;

Fig. 2 be the A of Fig. 1 to view, the form sketch map of vane group in burner when being embodiment 1 igniting;

Before Fig. 3 is igniting, the form sketch map that the vane group of embodiment 1 is packed up in burner;

Fig. 4 is the three-view diagram of the embodiment 1 and the guide vane of enforcement 2;

Fig. 5 be the A of Fig. 1 to view, the form sketch map of vane group in burner when being embodiment 2 igniting;

Before Fig. 6 is igniting, the form sketch map that the vane group of embodiment 2 is packed up in burner;

Fig. 7 is the plasma non-oil ignition fractional combustion device sketch map of embodiment 3;

Fig. 8 is the three-view diagram of the guide vane of embodiment 3;

Fig. 9 be the B of Fig. 7 to view, be the form sketch map of vane group in burner of embodiment 3.

The specific embodiment

Specify the utility model below in conjunction with instance.

Embodiment 1

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the utility model is the breeze airflow guide vane group 3 that a kind of burner is used, and is arranged in the burner 2; Be furnished with 2 groups of guide vane groups 3 altogether, this guide vane group 3 comprises 4 guide vanes 5, all has the gap between the guide vane 5; Guide vane is an arc shape; Radius of curvature is identical with the burner nozzle radius of curvature, and the center of circle of guide vane 5 cambered surfaces is connected with movable guide rod 4 on the guide vane 5 in burner.Guide vane group 3 and burner 2 coaxial layouts.Movable guide rod 4 also radially pierces into burner 2 along the radial arrangement of burner 2, and it is radially movable to drive guide vane 5.

The utility model is to use like this:

Before the igniting, as shown in Figure 3, guide vane 5 is packed up, and is attached to burner inner wall.When ignition of the boiler, as shown in Figure 2,4 guide vanes that movable guide rod 4 promotes guide vane group 3 all push the burner middle part.This vane group can be with breeze airflow separated into two parts (or approximate separated into two parts).The incendiary source 1 that the external world provides (plasma generator or little oil mass igniter) is from axial insertion burner 2 in the 1st group of space that vane group 3 is surrounded; The breeze airflow that gets into this space is lighted; And form the bigger incendiary source of new, stable, thermal power at this vane group end outlet; Utilize this incendiary source to light the breeze airflow in the 2nd group of vane group of new entering 3, and at terminal bigger incendiary source, this incendiary source entering boiler furnace of forming of the 2nd group of vane group; And light the last layer breeze airflow, finally in boiler furnace, form a Great Fire Ball.

All there is the gap between the guide vane 5 in this vane group 3; Breeze airflow can be through the Clearance Flow between the guide vane 5; Strengthened the blending of firing coal-dust and unignited coal dust of burner inside; Strengthen the backflow of high-temperature flue gas and entrainmented, more coal dust is heated, improved the success rate of little oil mass igniting and the effect of smooth combustion.

Treat that ignition of the boiler finishes, when this burner uses as main burner, extract the incendiary source 1 that the external world provides out burner.Guide vane group 3 can continue the classification breeze airflow, till also can being drawn to guide vane 5 and being close to burner inner wall through movable guide rod 4.

Embodiment 2

With reference to Fig. 1, Fig. 4, Fig. 5 and Fig. 6; The difference of present embodiment and embodiment 1 is that in the present embodiment, guide vane group 3 comprises 6 breeze airflow guide vanes 5; The radius of curvature of guide vane 5 is identical with the radius of curvature of burner nozzle; The center of circle of guide vane 5 cambered surfaces is in burner, and each breeze airflow guide vane 5 is the center of circle (centre point 6 is the pivot of blade 5) with certain centre point 6 respectively, inserts burner 2 with circular arc reciprocating motion mode.This vane group 3 can be with breeze airflow separated into two parts (or approximate separated into two parts).The incendiary source 1 that the external world provides axially inserts the space that guide vane group 3 is surrounded; The breeze airflow that gets into this space is lighted; And form the bigger incendiary source of new, stable, thermal power at these guide vane group 3 end outlets, utilize this incendiary source to light remaining breeze airflow.

All there is the gap between the guide vane 5 in this vane group 3; Breeze airflow can be through the Clearance Flow between the guide vane 5; Strengthened the blending of firing coal-dust and unignited coal dust of burner inside; Strengthen the backflow of high-temperature flue gas and entrainmented, more coal dust is heated, improved plasma non-oil ignition or the success rate of little oil mass igniting and the effect of smooth combustion.

Treat that ignition of the boiler finishes, when this burner uses as main burner, can extract little oil mass igniter 1 out burner.Guide vane group 3 can continue the classification breeze airflow, also can rotate to be drawn to guide vane 5 and to be close to till the burner inner wall.

Embodiment 3

With reference to Fig. 7, Fig. 8 and Fig. 9; The difference of present embodiment and embodiment 1 is; In the present embodiment, guide vane group 3 comprises 5 breeze airflow guide vanes 5, and the radius of curvature of guide vane 5 is identical with the radius of curvature of burner nozzle; The center of circle of guide vane 5 cambered surfaces is outside burner; Movable guide rod 4 promotes guide vane groups 3 and axially inserts burner from burner, also can guide vane group 3 axially be extracted out from burner through movable guide rod 4, and promptly guide vane 3 inserts or extract out burner from axially (vertical paper direction Fig. 9).This vane group 3 can be with breeze airflow separated into two parts (or approximate separated into two parts).The space that the incendiary source 1 axial-entry blade group 3 that the external world provides is surrounded; The breeze airflow that gets into this space is lighted; And form the bigger incendiary source of new, stable, thermal power at these vane group 3 end outlets, utilize this incendiary source to light remaining breeze airflow.

Claims (6)

1. the breeze airflow guide vane group that burner is used is arranged in the burner (2), it is characterized in that, comprises at least 2 guide vanes (5), and to layout, there is the gap in guide vane between (5) to guide vane (5) in burner (2) inner loop.

2. guide vane group according to claim 1; It is characterized in that; Be connected with movable guide rod (4) on the said guide vane (5), said movable guide rod (4) is used for that each guide vane (5) is delivered to burner (2) middle part and forms guide vane group (3).

3. according to claim 1,2 described guide vane groups; It is characterized in that; Said movable guide rod (4) also radially pierces into burner (2) along the radial arrangement of burner (2); It is radially movable to drive guide vane (5), and said guide vane (5) has the radius of curvature identical with burner inner wall.

4. guide vane group according to claim 3 is characterized in that, said movable guide rod (4) is axial arranged along burner (2), and it is axially movable to drive guide vane (5).

5. guide vane group according to claim 1; It is characterized in that; Said guide vane (5) is long and narrow crooked arc shape; The cambered surface bending radius of lead blade (5) is identical with the radius of curvature of burner inner wall, and the planar development of crooked cambered surface is shaped as rectangle, parallelogram, trapezoidal.

6. guide vane group according to claim 1 is characterized in that, the center of circle of guide vane (5) cambered surface is in burner (2) or outside burner (2).

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