CN215174987U

CN215174987U - Low-cost high-wear-resistant hood

Info

Publication number: CN215174987U
Application number: CN202121559639.5U
Authority: CN
Inventors: 钱兵; 吴贞林; 张文志
Original assignee: Nantong Gaoxin Wearable Technology Co ltd
Current assignee: Nantong Gaoxin Wearable Technology Co ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-12-14
Anticipated expiration: 2031-07-09

Abstract

The utility model discloses a low-cost high-wear-resistance hood, which comprises a composite silicon carbide hood body; the composite silicon carbide blast cap body comprises a blast cap top and a blast cap cylinder; one end of the hood barrel is connected with the hood top, and an inner cavity is formed in the hood barrel; the other end of the hood barrel is provided with an opening communicated with the inner cavity; the upper part of the hood barrel is provided with a first air outlet; the lower part of the hood cylinder is provided with a second air outlet; the aperture of the air outlet II is 2.8-3.2 times of the aperture of the air outlet I. The utility model discloses can effectually avoid phenomena such as hood jam, coking and plenum hourglass sediment, improve hood life, reduce blowing out and overhaul the frequency, improve boiler efficiency.

Description

Low-cost high-wear-resistant hood

Technical Field

The utility model relates to a fluidized bed combustion boiler hood subassembly field, concretely relates to low-cost high wear resistant hood.

Background

The blast cap is an important part of a Circulating Fluidized Bed (CFB) boiler, is a vulnerable part under high temperature and high abrasion in a boiler, and the quality of the blast cap directly influences the fluidization working condition and the combustion stability of the CFB boiler, so that the safe operation of the CFB boiler is ensured.

The traditional blast cap is made of wear-resistant steel, works at high temperature, has low hardness and is easy to grind a roller; coke is easy to collect and block in the blast cap, and the function is lost; the burning out occurs because of the failure of ventilation and cooling.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a low-cost high wear-resisting hood, can effectually avoid phenomenons such as hood jam, coking and plenum deposit, improved hood life, reduce blowing out and overhaul the frequency, improve boiler efficiency.

In order to solve the technical problem, the utility model discloses take following technical scheme: a low-cost high-wear-resistance blast cap comprises a composite silicon carbide blast cap body; the composite silicon carbide blast cap body comprises a blast cap top and a blast cap cylinder; one end of the hood barrel is connected with the hood top, and an inner cavity is formed in the hood barrel; the other end of the hood barrel is provided with an opening communicated with the inner cavity; the upper part of the hood barrel is provided with a first air outlet; the lower part of the hood cylinder is provided with a second air outlet; the aperture of the air outlet II is 2.8-3.2 times of the aperture of the air outlet I.

Further, an anti-abrasion protruding part is arranged at the center of the wind cap top.

Furthermore, the air outlet holes are arranged on the side wall of the hood barrel at equal intervals and wind the hood barrel for a circle.

Furthermore, 4 circles of first air outlet holes are formed in the side wall of the wind cap cylinder; two adjacent circles of air outlets are staggered.

Furthermore, 4 air outlet holes II are distributed on the side wall of the hood barrel at equal intervals.

Furthermore, the composite silicon carbide blast cap body is prepared by mixing silicon carbide, high-alumina cement, high-temperature fibers and auxiliary materials and then injecting the mixture into a mold.

Furthermore, the first air hole and the second air hole are arranged in a downward inclination mode from the inside to the outside of the wind cap barrel, and the inclination angle of the first air hole and the second air hole is 12-18 degrees.

The utility model has the advantages that:

1) by adopting the composite silicon carbide blast cap body and utilizing the characteristics of high temperature resistance, wear resistance, corrosion resistance, high temperature creep resistance, thermal shock resistance and the like of silicon carbide ceramics, the phenomena of blast cap blockage, coking, wind chamber slag accumulation and the like can be effectively avoided, the service life of the blast cap is prolonged, the shutdown maintenance frequency is reduced, and the boiler efficiency is improved.

2) The utility model discloses a set up wind hole one and wind hole two, improve the size and the distribution condition in wind hole, avoid the wind hole to blow the phenomenon, reduce the jam rate of aperture, make boiler cloth wind even, reach the operation adjustment requirement.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely through the following detailed description.

Referring to fig. 1, the blast cap with low cost and high wear resistance of the present invention comprises a composite silicon carbide blast cap body 1; the composite silicon carbide blast cap body 1 is prepared by mixing silicon carbide, high-alumina cement, high-temperature fibers and auxiliary materials and then injecting the mixture into a mold.

The composite silicon carbide blast cap body 1 of the utility model comprises a blast cap top 11 and a blast cap barrel 12; the centre of the top 11 of the bonnet is provided with an anti-wear boss 15. One end of the blast cap cylinder 12 is connected with the blast cap top 11, and an inner cavity is arranged in the blast cap cylinder 12; the other end of the hood barrel 12 is provided with an opening communicated with the inner cavity; the upper part of the hood barrel 12 is provided with a first air outlet 13; the first air outlet holes 13 are arranged on the side wall of the hood barrel 12 at equal intervals and wind the hood barrel 12 for one circle. The side wall of the hood barrel 12 is provided with 4 circles of first air outlet holes 13; two adjacent circles of air outlet holes I13 are arranged in a staggered mode. The lower part of the hood barrel 12 is provided with a second air outlet 14; 4 air outlet holes 14 are distributed on the side wall of the hood barrel 12 at equal intervals. The aperture of the second air outlet 14 is 2.8-3.2 times of the aperture of the first air outlet. The first air hole and the second air hole are arranged in a downward inclination mode from the inside to the outside of the wind cap barrel, and the inclination angle of the first air hole and the second air hole is 12-18 degrees.

The utility model discloses a manufacturing method of low-cost high wear-resisting hood as follows:

1) preparing a composite silicon carbide mixture: comprises the following raw materials in percentage by mass: 75% of silicon carbide (three particles of 0-1mm,1-3mm and 3-5mm and silicon carbide fine powder are mixed according to a proportion), 12% of high-alumina cement, 3% of high-temperature fiber and 5% of auxiliary materials (water reducing agent, accelerator, silicon micropowder and the like).

2) And (3) manufacturing a combined wood die (consisting of an inner die and an outer die), and coating waterproof paint on a wood die core for 3 times. The position of hole is filled in the foam stick of high density (form the round hole after the casting, the purpose that adopts the foam stick is for thick liquids can shrink in the drying process, prevents that round hole department from producing the crackle).

3) And (3) placing the composite silicon carbide mixed material into a small mixer, adding 4% of water, stirring, adding 3% of high-temperature fiber after the slurry has fluidity, continuing stirring for 5 minutes, and discharging.

4) And (3) placing the wood mold on a small vibration platform, opening the vibration platform, injecting slurry into the pouring gate, and pouring until the pouring gate is full.

5) And (6) demolding. Demoulding after drying in the shade for 12 hours.

6) And (5) drying, namely drying the blank in the shade for 2 days, and then putting the blank into a drying furnace for drying for 24 hours.

7) And (5) repairing the hole, namely repairing the hole by using a drill bit to ensure that the hole is smooth.

8) And (6) heat treatment.

The utility model discloses a compound carborundum hood body, compound carborundum hood utilize the ceramic high temperature resistant of carborundum, stand wear and tear, corrosion-resistant, high temperature creep resistance and thermal shock resistance etc. characteristics, can effectually avoid phenomenons such as hood jam, coking and plenum deposition, improved hood life, reduce blowing out and overhaul the frequency, improve boiler efficiency.

The composite silicon carbide blast cap has the operation characteristics that: the air distribution is uniform, no slag is accumulated in the air chamber, the operation is safe and reliable, the service life can reach 3-5 years, and the phenomena of mutual relative blowing abrasion and local damage in the operation can be effectively avoided.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications or equivalent substitutions within the spirit and scope of the present invention, and such modifications or equivalent substitutions should also be considered as falling within the scope of the present invention.

The achieved performance of the hood manufactured by the method is as follows:

the physical properties of the blast cap manufactured by the method are as follows:

Claims

1. the utility model provides a low-cost high wear resistant hood which characterized in that: comprises a composite silicon carbide blast cap body (1); the composite silicon carbide blast cap body (1) comprises a blast cap top (11) and a blast cap barrel (12); one end of the blast cap cylinder (12) is connected with the blast cap top (11), and an inner cavity is arranged inside the blast cap cylinder (12); the other end of the hood barrel (12) is provided with an opening communicated with the inner cavity; the upper part of the hood barrel (12) is provided with a first air outlet hole (13); the lower part of the hood barrel (12) is provided with a second air outlet (14); the aperture of the second air outlet (14) is 2.8-3.2 times of the aperture of the first air outlet.

2. A low cost high wear resistant hood according to claim 1 wherein: an anti-abrasion bulge (15) is arranged at the center of the wind cap top (11).

3. A low cost high wear resistant hood according to claim 1 wherein: the first air outlet holes (13) are arranged on the side wall of the hood barrel (12) at equal intervals and wind the hood barrel (12) for one circle.

4. A low cost high wear resistant hood according to claim 3 wherein: the side wall of the hood barrel (12) is provided with 4 circles of first air outlet holes (13); two adjacent circles of air outlet holes I (13) are arranged in a staggered mode.

5. A low cost high wear resistant hood according to claim 1 wherein: 4 air outlet holes II (14) are distributed on the side wall of the hood barrel (12) at equal intervals.

6. A low cost high wear resistant hood according to claim 1 wherein: the composite silicon carbide blast cap body (1) is prepared by mixing silicon carbide, high-alumina cement, high-temperature fibers and auxiliary materials and then injecting the mixture into a mold.

7. A low cost high wear resistant hood according to claim 1 wherein: the first air hole and the second air hole are arranged in a downward inclination mode from the inside to the outside of the wind cap barrel, and the inclination angle of the first air hole and the second air hole is 12-18 degrees.