CN104728833A

CN104728833A - Special-shaped coal drop pipe for wear-resisting boiler

Info

Publication number: CN104728833A
Application number: CN201510121504.3A
Authority: CN
Inventors: 张兴波
Original assignee: Coal Chemical Industry Co Ltd By Shares Of Precious Ace Semi Of Qitaihe
Current assignee: Coal Chemical Industry Co Ltd By Shares Of Precious Ace Semi Of Qitaihe
Priority date: 2015-03-19
Filing date: 2015-03-19
Publication date: 2015-06-24
Anticipated expiration: 2035-03-19
Also published as: CN104728833B

Abstract

The invention discloses a special-shaped coal drop pipe for a wear-resisting boiler, and relates to a coal drop pipe which aims at solving the problem that the lower section of an existing coal drop pipe is poor in wear resistance. The special-shaped coal drop pipe for the wear-resisting boiler is composed of a coal drop pipe upper section and a coal drop pipe lower section, wherein the coal drop pipe upper section and the coal drop pipe lower section are welded together, the welded part is subjected to smooth transition by welding, the outer diameter of the coal drop pipe upper section is 273mm, and the wall thickness of the coal drop pipe upper section is 10mm; and the coal drop pipe lower section is a special-shaped coal drop pipe with a thickened lower wall, the outer diameter of the coal drop pipe lower section is 273mm, the inner wall of the coal drop pipe lower section is in the shape of an oval, the long axis a of the oval is 253mm, the short axis b of the oval is 251mm, and the thickness of the lower wall of the coal drop pipe lower section is 12mm. The special-shaped coal drop pipe disclosed by the invention has the advantages that firstly, the replacement cycle of the coal drop pipe is prolonged by at least six months; and secondly, the required maintenance costs, as well as various material costs of steel and castables and the like of the coal drop pipe and are reduced. The invention is mainly used for preparing special-shaped coal drop pipes for wear-resisting boilers.

Description

A kind of abrasion-proof boiler abnormity coal spout

Technical field

The present invention relates to a kind of coal spout.

Background technology

The CFBB of existing 130t/h is by Wuxi Huaguang Boiler Co., Ltd in conjunction with the said firm's CFBB Experience Design manufacture for many years, and its coal supply system is made up of disintegrating machine, belt, feeder and coal spout.The colm that granularity after crusher in crushing is less than 20mm is sent in burner hearth by coal spout by belt, feeder.

Material selected by coal spout is 1Gr18Ni9Ti, and it is wear-resisting, high temperature resistant, decay resistance is all relatively good.But in actual production runs, the coal cinder sending into burner hearth is very serious to the wearing and tearing of the lower wall of coal spout hypomere, all needs every year once to change coal spout hypomere.But, replacing coal spout is very loaded down with trivial details, a complicated job, and not only operating space is subject to the restriction of water-cooling wall and surrounding environment, causes operating difficulties, also need the castable of coal spout and boiler setting junction all to pound, complete after changing and again smear castable again.Renewal process is consuming time, effort not only, and the maintenance cost spent in process and the expense of castable are also very high.

Although a lot of high-abrasive material as: the appearing as of metal composite pipe, wear resistance ceramic tube etc. is improved coal spout wearability and is provided solution, and the tube wall of existing abrasion-proof pipe is all a lot of than common pipe thickness of pipe wall, if adopt this type of material, only has two kinds of methods:

(1) tube wall external diameter is increased: due to the restriction in the space of coal spout outer wall wind-engaging box and water-cooling wall, size, the leeway that the outer diameter of coal spout does not increase;

(2) reduce pipe wall internal diameters: if only change coal spout hypomere easy to wear, then use the internal diameter of the method coal spout hypomere must be less than coal spout epimere, must chute blockage be caused in the position of its handing-over position (weld seam).If change the material of a whole set of coal spout, the internal diameter entirety of coal spout diminishes and affects coal-supplying amount, and the time of simultaneously transforming oversizely again delays production, and process is complicated, expense is also very high.

Adopt the method for the abrasion resistance material such as metal composite pipe, wear resistance ceramic tube in sum and inapplicable.

Summary of the invention

The object of the invention is to solve the problem that existing coal spout hypomere wears no resistance, and a kind of abrasion-proof boiler abnormity coal spout is provided.

A kind of abrasion-proof boiler abnormity coal spout is made up of coal spout epimere and coal spout hypomere, coal spout epimere and coal spout hypomere weld together, and weld adopts welding to seamlessly transit, the external diameter of described coal spout epimere is 273mm, and the wall thickness of coal spout epimere is 10mm; Described coal spout hypomere is the special-shaped coal spout that lower wall thickeies, and the external diameter of coal spout hypomere is 273mm, and the inwall of coal spout hypomere is oval, oval major axis a=253mm, oval minor axis b=251mm, and the lower wall thickness m=12mm of coal spout hypomere.

Advantage of the present invention: one, the coal spout hypomere of abrasion-proof boiler abnormity coal spout is designed to the special-shaped coal spout that a kind of lower wall thickeies, and the outer wall for coal spout hypomere is still the round-shaped of common pipe, size constancy; Inwall is designed to the elliptical shape with outer wall pipeline center bias, adopt this kind of eccentric elliptic shape inwall, the lower wall thickness of coal spout hypomere adds 2mm, improve the wearability of lower wall, extend the replacement cycle of coal spout hypomere 3, meanwhile, coal spout two sections pipeline handing-over position 2 place can be seamlessly transitted by welding.Actual production also demonstrates, and this kind of design can not cause the generation of chute blockage phenomenon, and the replacement cycle of coal spout also extends at least half a year.Two, the special-shaped coal spout that lower wall thickeies is boiler coal chute raising wearability that come into operation, that adopt this kind to design, the prolongation replacement cycle provides simply, effective solution.The implementation cost of this kind of scheme is low, practical, greatly reduces simultaneously and changes maintenance cost needed for coal spout and every Master Cost such as steel, castable.

Accompanying drawing explanation

Fig. 1 is abrasion-proof boiler abnormity coal spout structural representation;

Fig. 2 is the sectional view of Fig. 1 along A-A.

Detailed description of the invention

Detailed description of the invention one: in conjunction with Fig. 1 and 2, present embodiment is a kind of abrasion-proof boiler abnormity coal spout, be made up of coal spout epimere 1 and coal spout hypomere 3, coal spout epimere and coal spout hypomere weld together, and weld 2 adopts welding to seamlessly transit, the external diameter of described coal spout epimere 1 is 273mm, and the wall thickness of coal spout epimere 1 is 10mm; The special-shaped coal spout that described coal spout hypomere 3 thickeies for lower wall, the external diameter of coal spout hypomere 3 is 273mm, and the inwall of coal spout hypomere 3 is oval, oval major axis a=253mm, oval minor axis b=251mm, and the thick m=12mm of lower wall 3-1 of coal spout hypomere.

Fig. 1 is abrasion-proof boiler abnormity coal spout structural representation, and in Fig. 1,1 is coal spout epimere, 2 welds, and 3 is coal spout hypomere, and 4 is wind box, and 5 is water-cooling wall, and 6 is burner hearth.

Fig. 2 is the sectional view of Fig. 1 along A-A, in Fig. 2,3 is coal spout hypomere, 3-1 is the lower wall of coal spout hypomere, 3-2 is the upper wall of coal spout hypomere, a represents the length of oval major axis, b represents the length of oval minor axis, and D represents the length of the external diameter of coal spout hypomere, and m represents the lower wall thickness of coal spout hypomere.

Detailed description of the invention two: the difference of present embodiment and detailed description of the invention one is: described abrasion-proof boiler abnormity coal spout is 1Gr18Ni9Ti coal spout.Other are identical with detailed description of the invention one.

Detailed description of the invention three: in conjunction with Fig. 1 and 2, present embodiment is the coal supply system of the CFBB of 130t/h, is made up of disintegrating machine, belt, feeder and abrasion-proof boiler abnormity coal spout; Described abrasion-proof boiler abnormity coal spout is made up of coal spout epimere 1 and coal spout hypomere 3, coal spout epimere 1 and coal spout hypomere 3 weld together, and weld 2 adopts welding to seamlessly transit, the external diameter of described coal spout epimere 1 is 273mm, and coal spout epimere 1 wall thickness is 10mm; The special-shaped coal spout that described coal spout hypomere 3 thickeies for lower wall, the external diameter of coal spout hypomere 3 is 273mm, and the inwall of coal spout hypomere 3 is oval, oval major axis a=253mm, oval minor axis b=251mm, and the thick m=12mm of lower wall 3-1 of coal spout hypomere; Abrasion-proof boiler abnormity coal spout is communicated with burner hearth 6, and the coal spout hypomere 3 of abrasion-proof boiler abnormity coal spout is sealed connected together with wind box 4 and water-cooling wall 5.

Detailed description of the invention four: the difference of present embodiment and detailed description of the invention three is: described abrasion-proof boiler abnormity coal spout is 1Gr18Ni9Ti coal spout.Other are identical with detailed description of the invention three.

Adopt following verification experimental verification effect of the present invention

Test one: the coal supply system of the CFBB of composition graphs 1 and Fig. 2,130t/h, is made up of disintegrating machine, belt, feeder and abrasion-proof boiler abnormity coal spout; Described abrasion-proof boiler abnormity coal spout is made up of coal spout epimere 1 and coal spout hypomere 3, coal spout epimere 1 and coal spout hypomere 3 weld together, and weld 2 adopts welding to seamlessly transit, the external diameter of described coal spout epimere 1 is 273mm, and the wall thickness of coal spout epimere 1 is 10mm; The special-shaped coal spout that described coal spout hypomere 3 thickeies for lower wall, the external diameter of coal spout hypomere 3 is 273mm, and the inwall of coal spout hypomere 3 is oval, oval major axis a=253mm, oval minor axis b=251mm, and the thick m=12mm of lower wall 3-1 of coal spout hypomere; Abrasion-proof boiler abnormity coal spout is communicated with burner hearth 6, and the coal spout hypomere 3 of abrasion-proof boiler abnormity coal spout is sealed connected together with wind box 4 and water-cooling wall 5.

Abrasion-proof boiler abnormity coal spout described in this test is 1Gr18Ni9Ti coal spout.

Test a coal supply system normal continuous and run 572 days, running occurs without chute blockage phenomenon, at the 573rd day that runs owing to grinding the serious wear of the lower wall of the coal spout hypomere of boiler abnormity coal spout, changes.

Test two: the coal supply system of the CFBB of existing 130t/h, is made up of disintegrating machine, belt, feeder and coal spout; Described coal spout is made up of coal spout epimere and coal spout hypomere, and coal spout epimere and coal spout hypomere weld together, and the external diameter of described coal spout epimere is 273mm, and the wall thickness of coal spout epimere is 10mm; The external diameter of described coal spout hypomere is 273mm, and the wall thickness of coal spout hypomere is 10mm.

Test two coal supply system normal continuous and run 342 days, running occurs without chute blockage phenomenon, at the 343rd day that runs due to the serious wear of the lower wall of the coal spout hypomere of coal spout, changes.

Contrasting known by testing one with test two, adopt the abrasion-proof boiler abnormity coal spout of the present invention's design can not cause chute blockage phenomenon, and the replacement cycle of coal spout also extending at least half a year.

Claims

1. an abrasion-proof boiler abnormity coal spout, it is characterized in that abrasion-proof boiler abnormity coal spout is made up of coal spout epimere (1) and coal spout hypomere (3), coal spout epimere (1) and coal spout hypomere (3) weld together, and weld (2) adopts welding to seamlessly transit, the external diameter of described coal spout epimere (1) is 273mm, and the wall thickness of coal spout epimere (1) is 10mm; The special-shaped coal spout that described coal spout hypomere (3) thickeies for lower wall, the external diameter of coal spout hypomere (3) is 273mm, the inwall of coal spout hypomere (3) is oval, oval major axis a=253mm, oval minor axis b=251mm, and the lower wall of coal spout hypomere (3-1) thick m=12mm.

2. a kind of abrasion-proof boiler abnormity coal spout according to claim 1, is characterized in that described abrasion-proof boiler abnormity coal spout is 1Gr18Ni9Ti coal spout.