CN102287829A

CN102287829A - Direct flow and swirl flow joint outlet-type burner

Info

Publication number: CN102287829A
Application number: CN2011102861092A
Authority: CN
Inventors: 徐道芹
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-24
Filing date: 2011-09-24
Publication date: 2011-12-21

Abstract

The utility model discloses a direct flow and swirl flow joint outlet-type burner which relates to a burner which simultaneously burns liquid fuel and powder fuel. The direct flow and swirl flow joint outlet-type burner is characterized in that: an axial flow air channel comprises an axial flow air duct and a radial air duct; a radial air channel comprises the radial air duct and a pulverized coal air duct; the axial flow air channel and the radial air channel are parallelly connected into a mixed air channel; a spray nozzle ring is arranged at the opening of the mixed air channel; the pulverized coal air duct and a central mixed air duct form a pulverized coal air channel; the central mixed air duct and a fuel pipe form a central mixed air channel, and a mixed division board is arranged on the front end of the central mixed air channel; and a pulverized coal insert pipe is obliquely connected onto a coal conveying pipe. The direct flow and swirl flow joint outlet-type burner has the advantages that: the structure is novel and compact, the manufacturing is easy, the use is reliable, the difficult problem that direct flow air and swirl flow air interfere with each other is solved, the degree of separation is increased, the pulverized coal is quickly scattered, the length of black flame is shortened, once-through used amount of air and the discharge of NOx are reduced, the distribution of the pulverized coal is uniform, the burning is full, the burning efficiency is improved, energy is saved, loss is reduced, the wear of a pipeline is reduced, the service life is prolonged, the consumption of spare parts is reduced, and the production is facilitated.

Description

Direct current and eddy flow close the removing from mould burner

Technical field

The invention belongs to burner, relate in particular to the burner that liquid fuel and pulverized fuel burn simultaneously.

Background technology

At present, Industrial Stoves adopt four-way or multicenter combustor more.China Intellectual Property Office is disclosed a kind of " secondary enhancing eddy flow cement burner " (CN201434389Y), this burner center is a fuel pipe, and its fuel pipe has from inside to outside coaxial successively each that is nested layer pipeline: direct current cooling air passage, secondary eddy flow wind passage, defeated coal wind duct, main cyclone wind passage, jet wind passage; Between each pipe layers multi-point support is arranged, direct current cooling air passway abacus, there is the eddy flow counter direction jet trays secondary eddy flow wind passway.Its defective is: area of injection orifice is little, and it is very near that internal layer eddy flow wind and outer direct current wind lean on, and does not separate again, and the internal layer eddy flow is air-dry disturbs the outer direct current wind direction of motion, and direct current wind direction eddy flow wind is drawn close, and causes a direct current wind consumption big, and waste is many; The separating degree of eddy flow wind and direct current wind is bad, and coal dust is broken up slow, the weak effect of speed, and black duration and degree of heating is long, and it is insufficient to burn, and coal dust and fuel consume are many; Rear portion coal dust intubate is crossed the coal chute center line, central air hose in the middle of coal dust directly collides, wearing and tearing pipeline; Middle pipeline can be divided into two pulverized coal flow, and secondary converges overleaf then, very easily causes the meet pipeline worn out; Because two strands of pulverized coal flows become the water corrugated to advance and coal dust deadweight causes of settlement, cause the interior coal dust distributed pole of coal dust wind passage inhomogeneous, it is insufficient also to cause burning.This burner structure complexity in addition, spout ring branch is located on two pipelines, very easily is out of shape during high-temp combustion, brings difficulty to maintenance, perhaps scraps.

Summary of the invention

In order to overcome the defective that prior art exists, the purpose of this invention is to provide the burner that a kind of direct current and eddy flow close out, solve interfering with each other between direct current wind and the eddy flow wind, increase separating degree, break up coal dust fast, shorten black duration and degree of heating length, reduce one time the wind consumption, reduce the NOx discharging; Coal dust is evenly distributed in the coal dust wind passage, and fully burning reduces pipe wear; Improve efficiency of combustion, fuel savings is improved environment; Simplified structure is easy to make and maintenance, reduces spare parts consumption.

Direct current and eddy flow close the trip burner, comprise oversheath, coal dust airduct and fuel pipe, the coaxial therebetween axial flow wind passage that is provided with, the footpath is passage aweather, coal dust wind passage, center mixing wind passage, also comprise the coal chute and the coal dust intubate that are connected with coal pipe, be characterized in: axial flow wind passage by the axial flow airduct and radially airduct form, the footpath aweather passage by radially airduct and coal dust airduct constitute, footpath aweather passage front end is provided with spinning disk, axial flow wind passage and footpath be passage and be connected into and mix the wind passage aweather, the hybrid channel mouth is established nozzle ring, and direct current wind and eddy flow wind converge the back and sprayed by nozzle ring; Coal dust airduct and center mixing airduct constitute coal dust wind passage, and coal dust flows in the coal dust passage; Center mixing airduct and fuel pipe formation center mixing wind passage, center mixing airduct front end place establishes the mixing division board, and fuel pipe is located in and mixes in the division board; Coal dust intubate mitered is on coal chute, and the two angle is γ.

Described oversheath is made of fire-resistant sheath and asbestos layer.

The present invention further improves, described nozzle ring, outside vertical is between Qi Pour oblique angle of inwall inclination α=1 °-11 °, inwall is established groove, and the degree of depth ecto-entad of groove deepens, and axially keeps smooth, the radially descending vertically variation of roughness, make skin-friction coefficient produce anisotropy, the axial rub coefficient is less than the radial friction coefficient, and the skin-friction coefficient of close nozzle is less than the coefficient of friction away from nozzle.Therefore, direct current wind is axially unaffected, and eddy flow wind effect direct current wind is hindered, and two bursts of wind separating degrees are big, both reduced direct current wind consumption, can break up coal dust very soon again, shortens black duration and degree of heating length.Roughness diminishes from inside to outside and groove depth shoals from inside to outside, can stop strip wind to occur, and helps protecting nozzle ring.

The present invention further improves, described mixing division board is by orifice plate, air-out shading ring and divide the wind shading ring to constitute, establish large through-hole and small through hole on the orifice plate, large through-hole cooperates with fuel pipe, fuel pipe wears wherein, mixes wind and forms center direct current wind by small through hole, and the orifice plate side is established skewed slot; between the Pour oblique angle β=15 °-45 °, produce center eddy flow wind; The orifice plate outside sets out the wind shading ring, reduces air-out interfering with each other before uneven; Branch wind shading ring is established in the orifice plate inboard, separates the ratio of two kinds of wind, and prevents internal interference, and center direct current wind solves flame kernel sinuous flow, tempering, retention flame shape, and center eddy flow wind solves center coal dust gathering and quickens to break up coal dust, makes coal dust firing abundant.Mix division board and be wholely set, compact conformation, be easy to processing, use reliable.

The present invention further improves, and described coal dust intubate is a rectangular tube, with circular coal chute inclination grafting ， Pour oblique angle=10 °-20 °, inserts from the circumferential weld of interior circle and cylindrical, and is tangent with interior round cylindrical, smooth connection.Coal dust is spinned to move in the circular passage and is advanced, and the radial circumference motion both can solve the whereabouts problem that the coal dust deadweight causes, coal dust is evenly distributed, sufficient combustion improves efficiency of combustion, and is energy-saving and cost-reducing, help improving environment, center of impact mixing airduct not reduces the wearing and tearing of pipeline again.

Fuel oil sprays from fuel pipe, and coal dust sprays from coal dust wind passage, burns in the air-flow of the combustion air that mixing wind passage, center mixing wind passage are sent into.

Compared with prior art, advantage is: novel, compact conformation, reasonable is made easily, and is safe and reliable; Solve the difficult problem that direct current wind and eddy flow wind interfere with each other, increased separating degree, broken up coal dust fast, shortened black duration and degree of heating length greatly, reduced one time the wind consumption, reduced the NOx discharge capacity; Coal dust being evenly distributed in coal dust wind passage, burning evenly, have fully been improved the efficiency of combustion and the thermal efficiency, and be energy-saving and cost-reducing, helps environmental protection; Alleviate pipe wear and nozzle, the high temperature deformation of mixing division board, increase the service life, reduce maintenance rate, reduce spare parts consumption, help producing.

Description of drawings

The invention will be further described for the contrast accompanying drawing below.

Fig. 1 is that direct current and eddy flow close out burner structure signal (analysing and observe) figure.

Fig. 2 is the three-dimensional cutaway view of Fig. 1.

Fig. 3 is the side view of Fig. 1.

Fig. 4 is the nozzle ring structural representation of Fig. 1.

Fig. 5 is the central air hose structural representation (analysing and observe) of Fig. 1.

Fig. 6 is the side view of Fig. 5.

Fig. 7 is the stereogram of Fig. 5.

Fig. 8 is the mixing division board side view of Fig. 7.

Fig. 9 is the present invention's a coal dust intubate connection diagram.

Figure 10 is that the A of Fig. 9 is to view.

Figure 11 is the vertical view of Fig. 9.

The specific embodiment

By Fig. 1, Fig. 2, Fig. 3, Fig. 9 direct current and eddy flow as can be seen closes the removing from mould burner, by fire-resistant sheath 1, asbestos layer 2, axial flow airduct 5, radially airduct 7, coal dust airduct 9, the 11 coaxial settings of center mixing airduct, be sleeved on the fuel pipe 14, establish the support chip support between each layer pipeline, the axial flow airduct constitutes axial flow wind passage 6 with airduct radially, radially airduct and coal dust airduct constitute aweather passage 8 of footpath, the footpath is passage and axial flow wind passage front portion and be connected into and mix wind passage 4 aweather, spinning disk 15 is established in footpath aweather passage, nozzle ring 3 is connected with axial flow airduct 5, is fixed on the front end of axial flow airduct.Mix division board 12 and be fixed on the center mixing airduct 11, centering mixing wind passage front end, coal dust airduct 9 and center mixing airduct 11 constitute coal dust wind path 10; Center mixing airduct 11 and fuel pipe 14 formation center mixing wind passages 13, coal dust wind passage is mixing between wind passage and the center mixing wind passage.The axial flow airduct, radially by-pass valve control (among the figure mark) is set on airduct and the center mixing airduct respectively.

Fig. 4 as can be seen, nozzle ring 3 outside vertical, inwall slopes inwardly, between inclined angle alpha=1 °-11 °, inwall is established groove 16.It is smooth, radially coarse that inwall axially keeps, roughness from large to small vertically, the axial rub coefficient is less than the radial friction coefficient, near the skin-friction coefficient of outlet less than skin-friction coefficient away from spout.

By Fig. 5, Fig. 6, Fig. 7, Fig. 8, can further find out, mix division board by orifice plate 18, air-out shading ring 17 with divide wind shading ring 19 to constitute, establish large through-hole on the orifice plate 18 and cooperate with fuel pipe 14, fuel pipe wears wherein.Establish small through hole on around the large through-hole, form center direct current wind, the orifice plate side is established skewed slot 20, between its angle of inclination beta=15 °-45 °, produces eddy flow wind; The orifice plate outside sets out wind shading ring 17, reduces interfering with each other of the preceding two kinds of wind of air-out, and branch wind shading ring 19 is established in the orifice plate inboard, cuts apart the ratio of two kinds of wind, and prevents internal interference.Mix division board and be wholely set, be fixed on the leading section of center mixing airduct.

By Fig. 9, Figure 10, Figure 11 as can be seen, coal dust intubate 21 is a rectangular tube, pegs graft with the coal chute 22 of circle, from the circumferential weld medium dip insertion of interior round center mixings airduct 13 and cylindrical coal chute 22, between inclination angle γ=10 °-20 °.Coal chute 22 is pegged graft at coal dust airduct 9 rear portions, and flange connects.From coal chute 22 rear portion insertion center mixing airducts 11, flange connects, and is sealed by ring flange.

Claims

1. direct current and eddy flow close the removing from mould burner, comprise oversheath, coal pipe and fuel pipe, coaxial therebetween axial flow wind passage, footpath aweather passage, coal dust wind passage, the center mixing wind passage of being provided with, it is characterized in that axial flow wind passage 4 by axial flow airduct 5 and radially airduct 7 form, the footpath aweather passage 8 by radially airduct and coal dust airduct 9 constitute, footpath aweather passage front end is provided with spinning disk 15, and axial flow wind passage and footpath be passage and be connected into and mix wind passage 4 aweather, and the hybrid channel mouth is established nozzle ring 3; Coal dust airduct and center mixing airduct constitute coal dust wind path 10, and coal dust flows in the coal dust passage; Center mixing airduct and fuel pipe 14 formation center mixing wind passages 13, center mixing airduct front end place establishes mixes division board 12, and fuel pipe is located in the division board; Coal dust intubate 21 mitereds are on coal chute 22, between the two angle γ.

2. direct current according to claim 1 and eddy flow close the removing from mould burner, it is characterized in that described nozzle ring, outside vertical, inwall tilts, between angle α=1 °-11 °, inwall is established groove 16, and the degree of depth ecto-entad of groove deepens, and axially keeps smooth, the radially descending vertically variation of roughness, skin-friction coefficient anisotropy, axial rub coefficient are less than the radial friction coefficient, and the skin-friction coefficient of close spout is less than the coefficient of friction away from spout.

3. direct current according to claim 1 and eddy flow close the removing from mould burner, it is characterized in that described mixing division board 12 is made of orifice plate 18, air-out shading ring 17 and branch wind shading ring 19, establish large through-hole and small through hole on the orifice plate, large through-hole cooperates with fuel pipe, and fuel pipe wears wherein; The orifice plate side is established skewed slot 20, between angle of inclination beta=15 °-45 °; The orifice plate outside sets out wind shading ring 17, and branch wind shading ring is established in the orifice plate inboard.

4. direct current according to claim 1 and eddy flow close the removing from mould burner, it is characterized in that described coal dust intubate 21 for being rectangular tube, tilts to peg graft with circular coal chute, oblique angle γ=10 °-20 °, from the circumferential weld of interior circle and cylindrical, insert, tangent with interior round cylindrical, smooth connection.