CN1029642C

CN1029642C - Powdered coal burner with blunt body

Info

Publication number: CN1029642C
Application number: CN 90108583
Authority: CN
Inventors: 钱壬章; 陈维汉; 郑远平
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 1990-10-20
Filing date: 1990-10-20
Publication date: 1995-08-30
Anticipated expiration: 2005-10-20
Also published as: CN1061086A

Abstract

The present invention discloses a powdered coal burner with a blunt body, which is composed of a primary air pipe, an upper connecting plate, a lower connecting plate and a blunt body with a gap. The powdered coal burner has the capability of obtaining a stable heat source in a backflow region behind the blunt body, can effectively increase the flame stability in the backflow region, and is especially suitable for burning faulty coal.

Description

Powdered coal burner with blunt body

The present invention relates to a kind of coal burner with bluff body

The patent ZN86106374 of HUST " a kind of coal burner " though can solve the problem of smooth combustion and overheavy firing effectively,, owing to adopt the jet nozzle of hollow bluff body and bluff body bottom surface to make the structure complicated of burner.

For overcoming the shortcoming that above-mentioned patent exists, the coal burner that the applicant provides a kind of single flow band to crack bluff body.

This coal burner is to have a strip slit in the middle of bluff body.Burner with this bluff body is fixed on the wind tube outlet place one time by last lower linking plate, and the strip slit is perpendicular or parallel along long line and bluff body bottom surface by an airduct center line.Structure as shown in Figure 1, the bluff body slit is vertical with the bluff body bottom surface; Structure as shown in Figure 2, its bluff body slit is parallel with the bluff body bottom surface.The height of a bluff body height and an airduct equates that physical dimensions such as the subtended angle of bluff body, hem width and gap width are definite by other thermal parameters of boiler structure, coal and operation thereof, or definite through testing.

The crack advantage of coal burner of bluff body of this single flow band is, directly enter the recirculating zone of bluff body back from a small gangs of breeze airflow in bluff body slit, since the shallow bid coal dust very easily in the recirculating zone, obtain enough heats and fire burns, thereby make the recirculating zone behind the bluff body obtain a stable thermal source, improve the flame stabilization ability of recirculating zone.Experimental result shows that the recirculating zone temperature levels of the bluff body that cracks generally is higher than the bluff body recirculating zone of not cracking, and coal is poorer, and the gap of relative temperature level is bigger.Because the raising of steady flame ability, the bluff body burner that cracks can be used among the air velocity scope of coal scope and broad more widely.

Description of drawings is as follows:

Fig. 1 is the crack structural representation of bluff body burner of single flow band.(1) airduct among the figure, (2) bluff body that cracks, (3) strip slit.

Fig. 2 is for heading straight for seam (vertical bluff body bottom surface) bluff body structural representation.Fig. 2 (a) is for heading straight for seam bluff body front view, and Fig. 2 (b) is the side view of Fig. 2 (a), and Fig. 2 (c) is the A-A cutaway view of Fig. 2 (a), and wherein (1) is an airduct, and (2) are bluff body, and (3) are for heading straight for seam.

Fig. 3 is horizontal cracking (parallel bluff body bottom surface) bluff body structural representation.Fig. 3 (a) is the horizontal bluff body front view that cracks, and Fig. 3 (b) is the side view of Fig. 3 (a), and Fig. 3 (c) is the A-A cutaway view of Fig. 3 (a), and (1) is an airduct among the figure, and (2) are the horizontal bluff body that cracks, and (3) are the horizontal crack of cracking.

Fig. 4 is two bluff body structural representations.Fig. 4 (a) is the front view of two bluff body structural representations, and Fig. 4 (b) is the side view of Fig. 4 (a), and Fig. 4 (c) is the A-A cutaway view of Fig. 4 (a), and (1) is an airduct among the figure, and (2) are bluff body, and (3) are the bluff body slit.

The present invention can be described further by following examples.

Fig. 4 showed is the crack coal burner of bluff body of a kind of single flow band, and it is made up of an airduct (1), bluff body (2) and rectangular bluff body slit (3).Rectangular bluff body slit (3) forms at a distance of the distance in a slit in the middle of being put together by two identical bluff bodies of independent structures.The size in this slit is determined according to other thermal parameter tests of coal type and boiler.The bluff body height is identical with a wind tube outlet height, and the width of bluff body and other physical dimensions are determined according to coal type and the test of boiler heating power parameter.Bluff body is fixed on the wind tube outlet place one time by last lower linking plate.

Claims

1, a kind of coal burner with bluff body, it is made up of bluff body, airduct, a last lower linking plate, have a strip slit in the middle of it is characterized by described bluff body, it is crossing and perpendicular to the bluff body bottom surface or be parallel to the bluff body bottom surface with the extended line of an airduct center line.