CN202442328U

CN202442328U - Bell-jar-shaped air cap for circulating fluidized bed boiler

Info

Publication number: CN202442328U
Application number: CN201220049502XU
Authority: CN
Inventors: 李艳; 林东森; 刘伟
Original assignee: WEIFANG SHIDE ENERGY SAVING AND ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Current assignee: WEIFANG SHIDE ENERGY SAVING AND ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Priority date: 2012-02-16
Filing date: 2012-02-16
Publication date: 2012-09-19
Anticipated expiration: 2022-02-16

Abstract

The utility model discloses a bell-jar-shaped air cap for a circulating fluidized bed boiler, comprising a bell-jar-shaped air cap body and an air cap seat tube connected with the air cap body, wherein the air cap body is internally provided with an air distribution chamber, the air cap seat tube extends into the air distribution chamber and the inward extension end of the air cap seat tube is communicated with the air distribution chamber, the lower part of the air cap body is circlewise provided with a plurality of air distribution holes which extend from the inner surface to the outer surface of the air cap body, the air distribution holes consist of an inclined section which is downwards inclined and a straight section which is in smooth transition with the inclined section, the port of the straight section is arranged on the outer surface of the air cap body, and the port of the inclined section is arranged on the inner surface of the air cap body; and the inward extension end of the air cap seat tube is connected with an end cover plate, and the air cap seat tube which is near to the end cover plate is circlewise provided with a plurality of air dissipating holes. The bell jar-shaped air cap can effectively prevent materials from entering into the air distribution chamber, can prevent the air distribution holes from being blocked, and has the advantages that the burning thermal efficiency of the boiler can be improved and the service life of the boiler can be prolonged.

Description

CFBB is used the bell-jar blast cap

Technical field

The utility model relates to a kind of CFBB and uses the bell-jar blast cap.

Background technology

Blast cap is the indispensable parts of CFBB, and its function is that the needed air of coal dust firing is got into burner hearth as far as possible equably.Blast cap is made up of blast cap body and blast cap seat pipe, and it is distributed in burner hearth bottom, can coal upwards be blown afloat through high pressure through the wind distributing hole on the blast cap body to be the boiling shape, thereby make burning more abundant.Because material can get into cloth wind chamber through blast cap hole resorption during the air-supply blast wandering, wind distributing hole is prone to stop up, and causes cloth wind chamber accumulated slag; The blast cap deficiency in draught is crossed cause thermal damage, has had a strong impact on boiler and has normally moved; Return the of short duration banking fire operation of boiler simultaneously and bring difficulty, restricted the continuous operation of boiler; And cause the blast cap wearing and tearing to blowing between the blast cap, cause production and maintenance cost to increase with jet deflection.

The utility model content

The technical problem that the utility model will solve provides a kind of material that can prevent and gets into cloth wind chamber, prevents that the CFBB that wind distributing hole stops up from using the bell-jar blast cap.

For solving the problems of the technologies described above; Provide a kind of CFBB to use the bell-jar blast cap; It comprises the blast cap body that is the bell jar shape and is connected the blast cap seat pipe on the blast cap body that establish cloth wind chamber in the blast cap body, blast cap seat pipe stretches in the cloth wind chamber and inner extending end is communicated with cloth wind chamber; Blast cap body bottom is periphery and extends out to a plurality of wind distributing holes of its outer surface from the blast cap body internal surface; Its design feature is: said wind distributing hole is formed by downward-sloping from top to bottom tilting section with the flat segments of tilting section rounding off, and the port of flat segments is positioned at the outer surface of blast cap body, and the port of tilting section is positioned at the inner surface of blast cap body.

Be connected with end casing on the inner extending end of said blast cap seat pipe, a plurality of diffusing wind hole has been periphery on the blast cap seat pipeline section near end casing.

Said blast cap body bottom is provided with mount grooves, and blast cap seat pipe is provided with the ring boss that adapts with mount grooves, is bolted with the nut that the ring boss is pressed against the mount grooves bottom on the mount grooves.

After adopting said structure, because wind distributing hole is provided with the tilting section being tilted under from top to bottom, thereby when blowing blast wandering; Material can not get into cloth wind chamber along tilting section, and blast cap cloth air port is not stopped up, and has prevented that effectively material from falling into cloth wind chamber; Wind distributing hole is difficult for stopping up, and can not cause cloth wind chamber accumulated slag or blast cap deficiency in draught phenomenon, can reduce the pressure head consumption of a pressure fan effectively; Have significantly energy-saving and cost-reducing effect, improved the thermal efficiency and the long service life of boiler combustion.

The setting in end casing and a plurality of diffusing wind hole makes cloth wind more even, can not take place to cause blast cap to wear and tear to blowing with jet deflection, and long service life, practiced thrift production and maintenance cost.Structure through nut, ring boss and mount grooves is connected blast cap seat pipe on the blast cap body, and it is not frayed that blast cap seat pipe is in operation, and need not maintenance, has alleviated working strength of workers.

In sum, the utility model can prevent effectively that material from getting into cloth wind chamber, prevents that wind distributing hole from stopping up, and has the thermal efficiency of raising boiler combustion and the advantage of long service life.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a blast cap main body structure sketch map.

The specific embodiment

CFBB as depicted in figs. 1 and 2 is used the bell-jar blast cap; It comprises the blast cap body 1 that is the bell jar shape and is connected the blast cap seat pipe 2 on the blast cap body 1; The bottom of blast cap seat pipe 2 is connected with pressure fan; Blast cap seat pipe 2 is connected with blast cap body 1 through following structure: blast cap body 1 bottom is provided with mount grooves 7, and blast cap seat pipe 2 is provided with the ring boss 8 that adapts with mount grooves 7, is bolted with the nut 9 that ring boss 8 is pressed against mount grooves 7 bottoms on the mount grooves 7.Establish cloth wind chamber 3 in the blast cap body 1, blast cap seat pipe 2 stretches in the cloth wind chamber 3 and inner extending end is communicated with cloth wind chamber 3, is connected with end casing 5 on the inner extending end of blast cap seat pipe 2, near a plurality of diffusing wind hole 6 that has been periphery on 2 sections of the blast cap seat pipes of end casing 5.Blast cap body 1 bottom is periphery and extends out to a plurality of wind distributing holes 4 of its outer surface from blast cap body 1 inner surface; Wind distributing hole 4 is formed by downward-sloping from top to bottom tilting section 41 with the flat segments 42 of tilting section rounding off; The port of flat segments 42 is positioned at the outer surface of blast cap body 1; The port of tilting section 41 is positioned at the inner surface of blast cap body 1, and the position in above-mentioned diffusing wind hole 6 is a little more than the port position of tilting section 41.

Claims

1. a CFBB is used the bell-jar blast cap; Comprise the blast cap body (1) that is the bell jar shape and be connected the blast cap seat pipe (2) on the blast cap body (1); Establish cloth wind chamber (3) in the blast cap body (1); Blast cap seat pipe (2) stretches in the cloth wind chamber (3) and inner extending end is communicated with cloth wind chamber (3); Blast cap body (1) bottom is periphery and extends out to a plurality of wind distributing holes (4) of its outer surface from blast cap body (1) inner surface; It is characterized in that: said wind distributing hole (4) is formed by downward-sloping from top to bottom tilting section (41) with the flat segments (42) of tilting section rounding off, and the port of flat segments (42) is positioned at the outer surface of blast cap body (1), and the port of tilting section (41) is positioned at the inner surface of blast cap body (1).

2. CFBB according to claim 1 is used the bell-jar blast cap; It is characterized in that: be connected with end casing (5) on the inner extending end of said blast cap seat pipe (2), a plurality of diffusing wind holes (6) have been periphery on blast cap seat pipe (2) section near end casing (5).

3. CFBB according to claim 1 and 2 is used the bell-jar blast cap; It is characterized in that: said blast cap body (1) bottom is provided with mount grooves (7); Blast cap seat pipe (2) is provided with the ring boss (8) that adapts with mount grooves (7), is bolted with the nut (9) that ring boss (8) is pressed against mount grooves (7) bottom on the mount grooves (7).