CN2048161U

CN2048161U - Anti-burn burner with air film

Info

Publication number: CN2048161U
Application number: CN 89202208
Authority: CN
Inventors: 卫景彬; 黎军; 王宏宇; 徐大鹏; 吴承康
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 1989-03-06
Filing date: 1989-03-06
Publication date: 1989-11-22

Abstract

The utility model relates to a burner preventing the wall face of the burning chamber from forming coke. The utility model utilizes an air film nozzle to spray airflow into the wall face of the burning chamber, forms a wall face airflow film, achieves the purpose of isolating the wall face of the burning chamber from coke objects, and prevents the wall facing from forming coke. The direction of the air film nozzle is uniform with the direction of the main airflow at the wall face of the burning chamber. The airflow nozzle is sequentially provided with various burners on the physical situation, such as a cyclone burner, a blunt body burner, a big speed difference equidirectional jet flow burner, a flat jet burner, etc.

Description

Anti-burn burner with air film

A kind of burner that prevents combustion chamber internal face coking.

Burner generally is made up of combustion chamber cylindrical shell and air-fuel mixture spout.At present, main burner has four types: (1) turbulent burner, utilize the air-flow rotation formation center backflow retention flame; (2) bluff body burner utilizes air-flow to stream the trailing vortex retention flame that forms at the bluff body afterbody behind the bluff body; (3) high speed difference same direction jet burner utilizes that injection forms the backflow retention flame between jet combination in the combustion chamber; (4) flat jet burner utilizes the jet wall attachment effect to form the backflow retention flame in the combustion chamber.

This four classes burner, its first three plant and when combusting coal fines, all have coking problem, first kind and second kind are particularly serious.The 4th kind of burner, there is the non-reaction high velocity air of one deck layer at its lower wall surface place, combustion chamber, thereby it is burnt ashless to have guaranteed that lower wall surface does not have, but at the upper wall surface place, to some coal, still has floating burnt phenomenon to exist.

The performance quality of burner has two important sign: the one, and flame stabilization ability in the combustion chamber; The one, prevent the ability of coking in the combustion chamber.Prevent coking in the combustion chamber, do not reduce again simultaneously or the stabilizing power of the combustion chamber that increases that optimized way is to utilize the air-flow combination to achieve the goal.

The purpose of this utility model is to provide a kind of burner that prevents the combustion chamber wall surface coking.He can prevent coking and fouling phenomenon in the combustion chamber effectively, and its steady combustion to the combustion chamber simultaneously is favourable.

The utility model adopts the air film spout is installed on the internal face of combustion chamber, after making gas by the spout ejection, form an air-flow rete at the combustion chamber wall surface place, wall and coking material are isolated, so not only can prevent the wall coking, and can cooling combustion locular wall face, reduce NO simultaneously _XPollutant generation and reduction sulfide etc. are to the erosion of wall.

In the utility model, air film spout direction should be identical with combustion chamber wall surface place primary air direction, thereby guarantee that the air film that is parallel to wall flows this place's primary air direction basically identical in flow direction and the combustion chamber.Like this, when preventing the combustion chamber coking, help the raising that ability is surely fired in the combustion chamber.

The utility model accompanying drawing is respectively:

Fig. 1 is the anti-scorch turbulent burner of air film;

Fig. 2 is the anti-scorch turbulent burner air film of an air film spout;

Fig. 3 is the anti-scorch bluff body burner of air film;

Fig. 4 is the anti-scorch high speed difference same direction jet of an air film burner;

Fig. 5 is the anti-scorch flat jet burner of air film.

In conjunction with the accompanying drawings principle of the present utility model and enforcement thereof are narrated now.

Fig. 1 and Fig. 2 are the turbulent burner that is furnished with the air film spout.One time wind enters combustion chamber (3) by spout (1) through cyclone (2), forms swirling eddy and flows.Air film spout (6) is pressed the swirling eddy direction and is arranged.Enter air between combustion chamber inwall (3) and the outer wall (5) by overfire air port (4), enter combustion chamber (3), go up at combustion chamber inwall (3) and form and rotation primary air air film stream in the same way through air film spout (6).Air film stream prevents that effectively rotating primary air reaches wall, thereby prevents that coking material coking on wall takes place in the primary air.

Fig. 3 is the bluff body burner that is furnished with the air film spout.One time wind enters combustion chamber (3) by spout (1), and primary air streams bluff body (2) back trend wall, and forms eddy current at the bluff body afterbody.Secondary wind enters between combustion chamber inwall (3) and the outer wall (5) through spout (4), again in air film spout (6) enters combustion chamber (3).The air film flow path direction is write out a prescription to identical at wall with primary air.

Fig. 4 is the high speed difference same direction jet burner that is furnished with the air film spout.One time wind enters combustion chamber (3) through spout (1), and under high velocity air (2) injection, the recirculating zone is formed at the top in combustion chamber (3).Secondary wind enters between combustion chamber inwall (3) and the outer wall (5) through spout (4), enters combustion chamber (3) through air film spout (6) again, and on top, combustion chamber, air film stream is reverse flow, with the backflow primary air in the same way; In the bottom, combustion chamber, air film stream is forward, with forward primary air herein in the same way.

Fig. 5 is the flat jet burner that is furnished with the air film spout.One time wind enters combustion chamber (3) by flat spout (1), and it is moving to form attached jet in the combustion chamber, thereby the recirculating zone is formed at (3) top in the combustion chamber.Because there is a non-reaction high speed bottom flow layer at lower wall surface place, flat jet combustion chamber, thereby the lower wall place needn't cloth dress air film spout.On upper wall surface, arrange reverse air film spout (6).Secondary wind is entered between combustion chamber inwall (3) and the outer wall (5) by spout (4), enters combustion chamber (3) through air film spout (6) again.Air film stream can prevent the floating burnt generation of flat jet combustion chamber upper wall effectively.

The utility model is not only applicable to above a few class burner, also can be applicable to the burner of other types, by the air film spout is installed, reaches the purpose that prevents the Inner Wall of Combustion Chamber coking.

The utility model also has simple in structure, and is convenient to existing burner repacking, reduces the advantages such as maintenance load in the use.

Claims

1, a kind of noncoking burner with inside and outside wall structure and air-fuel mixture spout is characterized in that being equipped with on the internal face of combustion chamber the air film spout.

2, burner according to claim 1, it is characterized in that being positioned at air film spout direction and combustion chamber primary air on the internal face of combustion chamber at this prescription to identical.