CN2141029Y

CN2141029Y - Cyclone high-density pulverized coal burner

Info

Publication number: CN2141029Y
Application number: CN 92231327
Authority: CN
Inventors: 童玉清
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-28
Filing date: 1992-08-28
Publication date: 1993-08-25
Anticipated expiration: 2002-08-28

Abstract

The utility model relates to a novel cyclone high-density coal powder burner, belonging to the technical field of coal powder combustion. The burner comprises a U-shaped three-way coal powder dense-thin separator and a secondary air register. The common concentration of primary air flows across the U-shaped separator, most of coal powder are concentrated into the outside of the curve of the separator, and the low concentration of coal powder streams are formed at inside. A secondary air enters into the secondary air register by an air source, direct current airflow and a rotary airflow are formed, and an aerodynamic field required by combustion processes is formed under the effect of a guide vane wheel. The utility model has the advantages that the structure is simple, the cost of operation is low, the operation is convenient, the combustion performance is good, etc.

Description

Cyclone high-density pulverized coal burner

The utility model relates to a kind of novel spiral-flow type high concentration pulverized coal combustion device, belongs to coal powder burning technology field.

The high concentration pulverized coal combustion technology to overheavy firing improve efficiency of combustion, economize on coal, fuel-economizing, expansion load regulation range, it is significant to reduce environmental pollution etc.High concentration pulverized coal combustion was once tested low waving on the anthracitic boiler of branch of burning by the Soviet Union.Its high concentration pulverized coal is to rely on newly for the powder mode, promptly carries the coal dust ［＞100Kg(coal dust)/Kg(air) ］ of ultrahigh concentration to inject an airduct (pure air) to the position from 1.7 meters of burners with the compressed air high pressure.Inject the interior different depth of pipe by coal dust, form burner nozzle and spray uneven wind powder mixture, the pulverized coal flow of its middle and high concentration can obtain good result.But the shortcoming of this method is that system complex, investment are big, operating cost is high.

The purpose of this utility model be the design a kind of economy, effective, simple in structure, operating cost is low, easy to operate, the spiral-flow type high concentration pulverized coal combustion device that combustibility is good.

Content of the present utility model is that spiral-flow type high concentration pulverized coal combustion device is made up of U type threeway fine coal ring shaped separator and secondary wind air register.U type three-way separator comprises wind inlet, U type passage, low concentration coal dust output channel and high concentration pulverized coal stream ring exit pipeline one time.Secondary wind air register comprises direct current secondary wind air door, swirl secondary air air door, secondary wind bellows, guide vane wheel, overfire air port and flame holder.High concentration pulverized coal ring exit and the coaxial installation of flame holder are equipped with guide vane wheel and overfire air port successively between the two.The direct current secondary air register communicates with overfire air port, and the swirl secondary air door communicates with guide vane wheel.The extrados bending radius of U type passage is 300mm～700mm, and angle of bend is 30 °～90 °, and high concentration pulverized coal ring exit internal diameter is 0.65～1.22 with the ratio of low concentration coal dust output channel internal diameter.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Below in conjunction with accompanying drawing, introduce in detail detailed content of the present utility model and the course of work. Among Fig. 1,1 is a wind inlet passage, the 2nd, and U-shaped passage, the 3rd, low concentration coal dust output channel, the 4th, high concentration pulverized coal stream ring exit pipeline, the 5th, secondary air bellow, the 6th, the axial blade guide vane wheel, The 7th, furnace wall, the 8th, flame holder, the 9th, overfire air port, the 10th, direct-current secondary wind air door, the 11st, swirl secondary air air door, α₁Be U-shaped separator extrados angle of bend, R1 is U-shaped separator extrados bending radius, a1 thick coal culm stream, and a2 is the low concentration pulverized coal flow, and b1 is direct-current secondary wind, and b2 is swirl secondary air, and A is wind pulverized coal flow of common concentration, B is Secondary Air.

The course of work of burner is: the once distinguished and admirable A of the common concentration of sending here from pulverized coal preparation system, with the flow velocity of W1 by the import air channel 1 U-shaped threeway fine coal ring shaped separator of flowing through. Flow velocity W1 and U-shaped separator extrados bilge radius R1 and bent angle alpha by primary wind and powder stream₁Cooperation, make most of coal dust be concentrated to the outside of separator bend, form high concentration pulverized coal stream a1, the inboard of bend then forms low concentration pulverized coal flow a2. A1 4 is sent to hearth combustion through the circular passage. A2 then enters burner hearth by the outlet that pipeline 3 is sent to certain appropriate location of leaving dense powder flow export, participates in together burning under the drive of dense powder stream strong type burning. The importer of U-shaped separator is to selecting arbitrarily in 360 °. Secondary Air B delivers to the bellows 5 of burner by wind regime, by damper 10 and 11 Secondary Air B is divided into two gangs of b1 and b2, and b1 is straight-flow air, and the b2 axial blade guide vane wheel 6 of then flowing through forms swirling eddies. By the adjusting to air door 10,11 aperture sizes, make Secondary Air when overfire air port 9 sprays into burner hearth, has suitable spin intensity, the aerodynamic field that needs to form combustion process, the central hot that can produce suitable intensity refluxes, catch fire and combustion heat source for providing after the high concentrated coal powder ejection, the coal dust after catching fire is mixed strongly with Secondary Air, the development burning is until burnout. Flame holder 8(is commonly called as mushroom head) can move forward and backward, can assist to produce the hot reflux district, the subtended angle in the time of regulating again the high concentration pulverized coal ejection works to regulate flame. Whole burner is installed on the furnace wall 7, sprays coal dust and combustion air in burner hearth. Burner assembly play a part to organize coal dust continuously, good, efficient burning.

In order to obtain best technique effect, the extrados radius of curvature R 1 of the U type passage of burner is 300mm～700mm, and bent angle alpha 1 is 30 °～90 °.The internal diameter of high concentration pulverized coal ring exit is 0.65～1.22 with the ratio of the internal diameter of low concentration coal dust output channel.

The extrados radius of curvature R 1 that an embodiment of the present utility model is a U type passage is 90 ° for the 440mm angle of bend, and the internal diameter of high concentration pulverized coal ring exit is 1.06 with the ratio of the internal diameter of low concentration coal dust output channel.

Claims

1, a kind of spiral-flow type high concentration pulverized coal combustion device is characterized in that burner is made up of U type threeway fine coal ring shaped separator and secondary wind air register; Described U type three-way separator comprises wind inlet, U type passage, low concentration coal dust output channel and high concentration pulverized coal stream ring exit pipeline one time; Described secondary wind air register comprises direct current secondary wind air door, swirl secondary air air door, secondary wind bellows, guide vane wheel, overfire air port and flame holder; Described high concentration pulverized coal ring exit and the coaxial installation of flame holder; Guide vane wheel and overfire air port are installed between the two successively; Described direct current secondary air register communicates with overfire air port, and the rotation secondary air register communicates with guide vane wheel.

2, a kind of burner as claimed in claim 1, the extrados bending radius that it is characterized in that wherein said U type passage is 300mm～700mm, angle of bend is 30 °～90 °, and the internal diameter of described high concentration pulverized coal ring exit is 0.65～1.22 with the ratio of the internal diameter of low concentration coal dust output channel.

3, a kind of burner as claimed in claim 2 is characterized in that wherein said bending radius is 440mm, and angle of bend is 90 °, and described internal diameter ratio is 1.06.