CN111706855A

CN111706855A - Opposed firing boiler and secondary bellows subassembly thereof

Info

Publication number: CN111706855A
Application number: CN202010699323.XA
Authority: CN
Inventors: 张韬; 董永胜; 刘明; 崔节明; 王冠楠; 刘亚军; 路庭伟
Original assignee: Yantai Longyuan Power Technology Co Ltd
Current assignee: Yantai Longyuan Power Technology Co Ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-09-25

Abstract

The invention discloses an opposed firing boiler and a secondary air box assembly thereof, wherein the secondary air box assembly of the opposed firing boiler comprises an air box, an ash blowing pipe arranged in the air box and an air supply device used for supplying air to the ash blowing pipe, wherein the ash blowing pipe is provided with an ash blowing hole for blowing turbulent flow to the side wall of the air box. In the secondary bellows subassembly that this application provided, through set up out the ash pipe in the bellows, send into the bellows right through the soot blowing hole on the air feeder with gas through blowing the ash pipe when using, the air current forms the disturbance to the dust in the bellows when getting into the bellows, and then the deposition is kicked up, simultaneously carry the deposition of disturbance along with the buggy together burning in getting into furnace along with the overgrate air through the combustor, a small amount of flying ashes can not influence the furnace burning, the deposition problem in the bellows has been solved, the deposition volume in the bellows has been reduced.

Description

Opposed firing boiler and secondary bellows subassembly thereof

Technical Field

The invention relates to the technical field of wind boxes for boilers, in particular to a secondary wind box assembly of an opposed firing boiler. The invention also relates to an opposed firing boiler comprising the secondary air box assembly.

Background

The overfire air of traditional front and back wall opposed firing boiler all adopts big bellows structure, and specific big bellows encircles furnace water-cooling wall outside round, and the overfire air gets into big bellows by both sides wall, then flows into front and back wall to the combustor that the income was arranged in big bellows. After the front-rear wall opposed-flow boiler runs for a long time, a large amount of fly ash enters a secondary air box of the boiler from a rotary air preheater at the tail part of the boiler, a small amount of fine ash entering the secondary air box returns to a hearth along with hot air from a burner air port, and the rest ash is deposited in an air box of a secondary air box assembly again, so that the burner air port is blocked in serious cases.

When the bottom of the air box is damaged and blocked, the area of the air box is reduced, the air inlet of the secondary air burner at the bottom is blocked, so that the secondary air supply is not timely and uniform, the coal powder is completely combusted after the boiler, and the thermal efficiency of the boiler is reduced.

The common method is as follows: the dust discharging device is additionally arranged at the bottom of the air box, however, the dust discharging device is opened periodically, no disturbance device is arranged in the air box, dust is easy to accumulate at the bottom of the air box, and the dust accumulation inside the air box is serious.

Therefore, how to reduce the amount of ash deposited in the windbox is an urgent technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a secondary air box assembly of an opposed firing boiler, which is used for reducing the ash accumulation in an air box. It is another object of the present invention to provide a opposed firing boiler including the above secondary windbox assembly.

In order to achieve the purpose, the invention provides a secondary air box assembly of a hedging combustion boiler, which comprises an air box, an ash blowing pipe arranged in the air box and an air supply device used for supplying air to the ash blowing pipe, wherein an ash blowing hole for blowing turbulent flow to the side wall of the air box is formed in the ash blowing pipe.

Preferably, the blowing device further comprises a compressed air main pipe and a compressed air branch pipe which is located at the downstream of the compressed air main pipe and at the upstream of the blowing pipes, and at least two blowing pipes are connected to the compressed air branch pipe.

Preferably, the number of the compressed air branch pipes is at least two, and an air inlet of each compressed air branch pipe is independently provided with an electronic control stop valve which is positioned at the downstream of the compressed air main pipe.

Preferably, a manual stop valve is arranged on the compressed air main pipe.

Preferably, at least one row of the soot blowing holes is formed in the same soot blowing pipe along the depth direction of the windbox.

Preferably, the soot blowing holes on the same soot blowing pipe are arranged in at least two rows.

Preferably, the soot blowing pipe is located at the middle lower part of the windbox, and the gas passing through the soot blowing hole disturbs the bottom dust of the windbox.

Preferably, the number of the soot blowing pipes is multiple, and the soot blowing pipes are arranged in a row along the width direction of the hearth in the horizontal direction.

Preferably, the lance tube is rotatable about its axis.

An opposed firing boiler comprising a secondary windbox assembly, the secondary windbox assembly being any of the above.

In the technical scheme, the secondary air box assembly of the opposed firing boiler comprises an air box, an ash blowing pipe arranged in the air box and an air supply device used for supplying air to the ash blowing pipe, wherein an ash blowing hole which blows to the side wall of the air box for disturbing flow is formed in the ash blowing pipe.

According to the description, in the secondary bellows subassembly that this application provided, through set up out the ash pipe in the bellows, it is right to send into the bellows through the soot blowing hole on the soot blowing pipe with gas through air supply arrangement when using, the air current forms the disturbance to the dust in the bellows when getting into the bellows, and then the deposition is raised, carry the deposition of disturbance simultaneously and get into furnace along with the overgrate air and burn together along with the buggy in entering furnace through the combustor, a small amount of flying ashes can not influence the furnace burning, the deposition problem in the bellows has been solved, the deposition volume in the bellows has been reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a top view of a secondary bellows assembly provided in accordance with an embodiment of the present invention;

FIG. 2 is a front view of a secondary bellows assembly provided in accordance with an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of a secondary bellows assembly provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural view of a lance tube provided in an embodiment of the present invention.

Wherein in FIGS. 1-4: 1-air box, 2-soot blowing pipe, 3-soot blowing hole, 4-compressed air branch pipe, 51-first electric control stop valve, 52-second electric control stop valve, 6-manual stop valve, 7-compressed air main pipe and 8-burner.

Detailed Description

The core of the invention is to provide a secondary air box assembly of an opposed firing boiler, so as to reduce the ash accumulation in the air box. Another core of the present invention is to provide a opposed firing boiler comprising the above secondary windbox assembly.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Please refer to fig. 1 to fig. 4.

In a specific embodiment, the secondary air box assembly of the opposed firing boiler provided by the specific embodiment of the present invention includes a burner 8, an air box 1, a soot blowing pipe 2 disposed in the air box 1, and an air supply device for supplying air to the soot blowing pipe 2, wherein the soot blowing pipe 2 is provided with soot blowing holes 3 for blowing air to the side wall of the air box 1 to disturb flow. Preferably, the gas supply means is used to supply high-pressure gas into the lance tube 2. The gas in the wind box 1 enters the furnace chamber through the burner 8. Specifically, the soot blowing holes 3 may be hole structures such as cylindrical holes or rectangular holes provided in the soot blowing tube 2.

It can be known from the above description that in the secondary air box assembly provided in the embodiment of the present application, through setting up the ash discharging pipe in air box 1, send gas into air box 1 pair through the ash blowing hole 3 on the ash blowing pipe 2 through the air supply device when using, form the disturbance to the dust in air box 1 when the air current gets into air box 1, and then the deposition is raised, carry the deposition of disturbance simultaneously and get into furnace along with the overgrate air through combustor 8 and burn together with the buggy in the furnace, a small amount of fly ashes can not influence the furnace burning, the deposition problem in air box 1 has been solved, the deposition volume in air box 1 has been reduced.

Simultaneously, this application is carried out the disturbance through the efflux that utilizes compressed air to the deposition in bellows 1, prevents that the dust from being deposited in bellows 1 bottom, carries the deposition of disturbance simultaneously with the overgrate air through combustor 8's wind channel and gets into furnace, has avoided a large amount of depositions of bellows 1, and then has reduced the resistance of bellows 1 passageway, has balanced the air distribution with layer combustor 8, has optimized the homogeneity with layer combustor 8 air distribution.

In one embodiment, the secondary air box assembly of the opposed firing boiler further comprises a compressed air main 7 and a compressed air branch pipe 4 located downstream of the compressed air main 7 and upstream of the lance tubes 2, and at least two lance tubes 2 are connected to the compressed air branch pipe 4. Specifically, preferably, two adjacent lance tubes 2 on the same compressed air branch pipe 4 are arranged at equal intervals.

Wherein, the soot blowing pipe 2 is a straight pipe structure, and for the convenience of processing, the soot blowing pipe 2 is preferably a cylindrical pipe structure.

Soot blower pipe 2 is a plurality of, and is a plurality of soot blower pipe 2 horizontal direction is along furnace width direction and arranges the setting, and is preferred, and all soot blower pipes 2 guarantee the coverage that soot blower pipe 2 sweeps inside 1 bellows along furnace width direction evenly distributed.

Specifically, the number of the compressed air branch pipes 4 is at least two, an air inlet of each compressed air branch pipe 4 is independently provided with an electric control stop valve, and the electric control stop valves are positioned at the downstream of the compressed air main pipe 7. As shown in fig. 1, there are two compressed air branch pipes 4, wherein one compressed air branch pipe 4 is provided with a first electrically controlled stop valve 51, and the other compressed air branch pipe 4 is provided with a second electrically controlled stop valve 52. Through setting up automatically controlled stop valve, the automatic control of being convenient for, the user can remote control. The solenoid valves of the compressed air branch pipes 4 can be opened simultaneously or sequentially, and can be flexibly adjusted according to the operation condition.

Specifically, the first electrically controlled stop valve 51 and the second electrically controlled stop valve 52 can be opened simultaneously or sequentially, and can be flexibly adjusted according to the operation condition, so that the soot blowing pipe 2 has enough compressed air flow and coverage to cause the disturbance of soot deposition at the bottom of the air box 1, thereby achieving the expected effect.

In one embodiment, a manual shut-off valve 6 is provided on the compressed air manifold 7. The compressed air main pipe 7 is provided with a manual stop valve 6, so that the maintenance and the overhaul are convenient or the manual braking is adopted in an emergency.

During specific work, compressed air enters the compressed air branch pipe 4 through the compressed air main pipe 7 through the fully-opened manual stop valve 6, then the compressed air is controlled to be opened at regular time through the first electric control stop valve 51 and the second electric control stop valve 52, the compressed air enters the soot blowing pipe 2 in the air box 1, the compressed air is sprayed out from the soot blowing hole 3, the bottom of the air box 1 is blown, upward disturbance air flow is formed, and the bottom of the air box 1 is blown.

Specifically, at least one row of soot blowing holes 3 are formed in the same soot blowing pipe 2 along the depth direction of the air box 1. On the same row of soot blowing holes 3, adjacent soot blowing holes 3 are arranged at equal intervals, and specifically, the soot blowing holes 3 on the same row are uniformly arranged in the depth direction of the air box 1.

In order to increase the dust turbulence, the blowing openings 3 of the same blowing tube 2 are preferably arranged in at least two rows. Specifically, two adjacent rows of soot blowing holes 3 are arranged in parallel. Wherein the central connecting line of the same row of the soot blowing holes 3 is parallel to the axial line of the soot blowing pipe 2.

During specific processing, the arrangement and the number of the compressed air branch pipes 4 and the lance pipes 2 can be flexibly selected according to the size of the air box 1 and the parameters of compressed air, so that the lance pipes 2 can have enough compressed air flow and coverage range to achieve the expected effect.

In one embodiment, the lance tube 2 is located in the lower middle portion of the windbox 1 and the gas passing through the lance holes 3 creates a disturbance of the bottom dust of the windbox 1. Because the soot blowing pipe 2 is positioned at the middle lower part of the air box 1, enough disturbed airflow is formed when the bottom of the air box 1 is purged, so that the airflow which is discharged from the bottom of the air box 1 can be disturbed conveniently.

Specifically, the soot blowing holes 3 are venturi-type nozzles. The ash blowing holes 3 adopt Venturi type nozzles, so that the coverage range of blowing can be enlarged.

In one embodiment, the lance tube 2 is rotatable about its axis. Specifically, the soot blowing pipe 2 can rotate freely by 90 degrees around the central axis of the soot blowing pipe 2, so that the blowing coverage of the soot blowing pipe 2 can be enlarged. Specifically, the lance tube 2 and the compressed air branch tube 4 are axially and rotatably sealed, and preferably, the lance tube 2 is driven to rotate by a driving device.

Specifically, set for 3 initial positions of soot blowing hole and be located the position under soot blowing pipe 2, soot blowing hole 3 can rotate to the position that becomes 45 contained angles with vertical axis partially left and partially right along with the pipeline is the biggest in rotatory process, can increase the coverage that the pipeline sweeps.

The application provides a pair of towards combustion boiler, including secondary bellows subassembly, wherein secondary bellows subassembly is any kind of above-mentioned secondary bellows subassembly. While the foregoing has described specific structure for the secondary air box assembly, the present application includes the above-described secondary air box assembly, as well as the above-described technical effects.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a to dashing secondary bellows subassembly of burning boiler, includes bellows (1), its characterized in that still including setting up blow grey pipe (2) in bellows (1) and be used for to blow grey pipe (2) carrier gas's air supply unit, be equipped with on blow grey pipe (2) blow to blow grey hole (3) of bellows (1) lateral wall vortex.

2. A secondary air box assembly of a opposed-firing boiler according to claim 1, further comprising a compressed air main (7) and a compressed air branch pipe (4) located downstream of the compressed air main (7) and upstream of the lance tubes (2), at least two lance tubes (2) being connected to the compressed air branch pipe (4).

3. A secondary air box assembly of a opposed-firing boiler according to claim 2, wherein the number of the branched compressed air pipes (4) is at least two, and an air inlet of each branched compressed air pipe (4) is independently provided with an electrically controlled shut-off valve located downstream of the compressed air main (7).

4. A secondary air box assembly of an opposed-fired boiler according to claim 1, characterized in that a manual shut-off valve (6) is provided on the compressed air main (7).

5. A secondary wind box assembly of a opposed firing boiler according to claim 1, wherein at least one row of said lance holes (3) is provided in the same lance tube (2) in the depth direction of said wind box (1).

6. A secondary air box assembly of a opposed firing boiler according to claim 5, wherein the lance holes (3) of one and the same lance tube (2) are arranged in at least two rows.

7. A secondary windbox assembly of an opposed-firing boiler according to claim 1, wherein the lance tube (2) is located in the lower middle portion of the windbox (1) and the gas passing through the lance holes (3) causes turbulence to the bottom dust of the windbox (1).

8. The secondary windbox assembly of a opposed firing boiler according to claim 7, wherein the number of the lance tubes (2) is plural, and the plural lance tubes (2) are arranged in a row in a horizontal direction along a width direction of the furnace.

9. A secondary windbox assembly of a opposed-firing boiler according to any one of claims 1-8, wherein the lance tube (2) is rotatable about its axis.

10. A opposed firing boiler comprising a secondary windbox assembly, wherein the secondary windbox assembly is the secondary windbox assembly of any one of claims 1-9.