CN215570538U - W boiler secondary bellows ash removal device - Google Patents

Abstract

The utility model discloses a W boiler secondary air box ash removal device, which comprises an air box, a hearth and a water wall tube, and is characterized in that: the device comprises an ash discharge groove communicated with the air box and the hearth, wherein the ash discharge groove penetrates through the water-cooled wall. The utility model can reduce the work load of cleaning dust of the secondary air box of the boiler, improve the working efficiency of cleaning dust, reduce the labor intensity, have no dust during the operation process and reduce the environmental pollution.

Description

W boiler secondary bellows ash removal device

Technical Field

The utility model relates to the technical field of coal-fired boiler maintenance, in particular to a W boiler secondary air box ash removal device.

Background

In a coal-fired thermal power plant boiler, a secondary air wind box is an indispensable important part in a combustion system, and is used for collecting air for fuel combustion if needed in a centralized manner and distributing the air to a combustor uniformly. With the gradual development of science and technology, the capacity of a generator set in the thermal power industry advances towards the direction of high capacity and high parameter, and the matched air box is increased. Since the last 90 s, W-type flame boilers were introduced abroad under the unified arrangement of the national department of energy. The secondary air bellow corresponding to the boiler adopts a large annular bellow.

The air in the secondary air box comes from hot air at the outlet of an air preheater at the tail part of the boiler, and a rotary air preheater is usually adopted for the W-shaped flame boiler air preheater. The flue gas passes through air heater, gives air heater with heat transfer, and air heater rotates to the air side, releases heat heating air, forms hot-blast. Because the flue gas contains fly ash particles, the fine fly ash particles enter the hot air along with the air preheater and are carried to the air box through the air duct. The area of the air box is larger than that of the air duct, the flowing air speed in the air box is suddenly reduced, and fly ash particles are deposited. Along with the increase of the running time of the unit, the dust deposition is more serious, and the dust deposition is particularly prominent at four corners and the bottom of the secondary air box. When the ash deposit is blocked, the area of the air box is reduced, and the local burner can not supply air, so that the supply of secondary air is not timely and uniform, the burning-out degree of the pulverized coal in the boiler is deteriorated, and the thermal efficiency of the boiler is reduced. In the long-period operation of the unit, the local combustor is cooled for a long time without wind, so that the combustor in the area is easy to burn out. At present, in order to prevent the burner from being burnt out, a power plant generally stops the furnace once in half a year to eliminate the deficiency, and the dust deposited at the bottom of a secondary air bellows is cleaned. The cleaning work needs to transport the secondary air box dust deposit in bags or install a dust sliding pipe, the dust deposit is directly placed on the ground and then is packaged in bags, the workload is large, the dust raising is not easy to control, and the secondary pollution is easy to cause.

Chinese patent CN104654329A discloses a secondary air box soot blower for a W-flame boiler, and specifically discloses a soot blower which comprises a pipe with a blowing hole, an electromagnetic valve and a time relay, and can realize an automatic soot blowing function. But the problem of cleaning the secondary air box of the accumulated dust after soot blowing is not solved. Compared with the secondary air bellow soot blower of the W-flame boiler, the utility model solves the problem of cleaning the deposited soot of the secondary air bellow.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a W boiler secondary air box ash removal device capable of reducing labor intensity.

The purpose of the utility model is realized by the following technical scheme: the utility model provides a W boiler secondary bellows ash removal device, includes bellows, furnace and water wall pipe, its characterized in that: the ash discharging groove is communicated with the air box and the hearth, and penetrates through the water-cooled wall to be communicated with the air box and the hearth. By adopting the arrangement mode, the ash in the air box is introduced into the hearth from the air box and then fished out by the slag conveyor.

For further being convenient for deashing, put the ash chute and include ash bucket and ash discharge pipe, the ash bucket with the ash outlet of bellows is connected, ash discharge pipe with the ash bucket is connected, just ash discharge pipe passes the water-cooling wall with furnace intercommunication.

In order to further facilitate adjustment, an adjusting baffle and a track are arranged in the inner cavity of the ash hopper, and the adjusting baffle can slide up and down along the track.

In order to further realize automatic ash removal, the secondary air box side of the ash discharge groove is higher than the hearth side.

For further convenient manufacture, the section of the ash bucket is rectangular, the side wall of the ash discharging side of the ash bucket is provided with an opening, and the opening is used for being connected with the ash discharging pipe.

Preferably, the ash discharging pipe is a through pipe with two open ends.

Has the advantages that:

the ash bucket has a simple structure, does not need a large amount of manual operation, and can realize mechanical centralized ash removal by only adjusting the baffle in the ash bucket according to the working condition of the slag conveyor. The labor cost is saved, manual ash removal is not needed, and the labor intensity is reduced. No dust is raised in the operation process, and the environmental pollution can be reduced.

Drawings

FIG. 1 is a schematic structural diagram of a secondary windbox ash removal device of a W boiler in an embodiment.

Description of reference numerals: 1 is an ash bucket, 2 is an ash discharge pipe, 3 is an adjusting baffle, 4 is a track, 5 is a water wall pipe, 6 is a hearth, and 7 is a secondary air box.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention as claimed in the claims.

Example 1: as shown in FIG. 1, the present embodiment provides a dust removing device for a secondary air box of a W-type boiler, which comprises an ash discharge groove connecting a hearth 6 and the secondary air box 7, wherein the water-cooled wall 5 is provided with an opening. The ash discharging groove comprises an ash bucket 1 and an ash discharging pipe 2, the ash bucket is communicated with an ash outlet on the secondary air box, the ash outlet of the ash bucket is communicated with the ash discharging pipe, and the ash discharging pipe penetrates through an opening in the water-cooled wall to be communicated with the hearth.

In this embodiment, the ash bucket is provided with an adjusting baffle 3 and a track 4, and the secondary air box side of the ash discharge groove is higher than the water cooling wall side of the boiler. The ash discharge pipe is obliquely arranged downwards from the ash hopper end to the hearth end.

Therefore, the ash discharge groove is arranged obliquely downwards from the ash inlet end to the ash outlet end on the whole. Therefore, the dust can conveniently reach the hearth from the secondary air box through the dust discharge groove under the action of gravity.

As a preferred embodiment: ash bucket 1 is for depositing grey groove main part, and ash bucket 1 chooses for use the sheet metal component welding that thickness is 5mm to form.

As shown in figure 1, the side of the secondary air box 7 is provided with a hole, the ash hopper 1 is connected with the side of the secondary air box 7 in a welding way, and the cross section of the ash hopper 1 is larger than the hole on the side of the secondary air box 7.

Be provided with adjusting damper 3 and track 4 in the ash bucket, adjusting damper 3 controls adjusting damper scope of opening and shutting through sliding from top to bottom along track 4.

As shown in fig. 1, an ash hole is arranged on the side wall of the ash outlet end of the ash hopper 1 and is connected with the ash discharge pipe 2 in a welding manner. The ash discharge pipe is an aluminum through pipe, one end of the aluminum through pipe penetrates through the water-cooled wall to be communicated with the hearth 6, and the other end of the aluminum through pipe is connected with the ash bucket 1 in a welding mode.

By adopting the ash removal device of the embodiment, ash in the wind box is introduced into the hearth through the ash discharge groove. When the air box and the hearth are in negative pressure, namely when the induced draft fan runs, the adjusting baffle on the ash bucket is opened, the accumulated ash in the air box enters the hearth from the air box under the action of the negative pressure and gravity, and then the accumulated ash is fished out by the slag conveyor. According to the slag discharge condition of the slag conveyor, the ash discharge speed is adjusted by adjusting the upper position and the lower position of the baffle plate so as to be matched with the slag conveyor.

This embodiment simple structure need not a large amount of manual operation, only needs adjust the range that opens and shuts of the baffle in the ash bucket according to the behavior of dragveyer, can realize the mechanical concentrated deashing. The labor cost is saved, manual ash removal is not needed, and the labor intensity is reduced. The ash cleaning process has no dust emission and reduces the environmental pollution.

3 months in 2021, this factory #2 boiler overhaul, after using the W boiler secondary bellows ash removal device of this embodiment, when comparing the 2020 #1 boiler overhaul, the deashing time limit for a project is shortened to 2 days by 13 days, and the cost of overhaul practices thrift 6 ten thousand yuan, and the whole no raise dust of deashing operation.

Claims (4)

1. The utility model provides a W boiler secondary bellows ash removal device, includes bellows, furnace and water wall pipe, its characterized in that: including the intercommunication the ash chute of putting of bellows and furnace, it passes to put the ash chute the water-cooled wall intercommunication the bellows with furnace, put the ash chute including ash bucket and ash discharge tube, the ash bucket with the ash hole of bellows is connected, ash discharge tube with the ash bucket is connected, just ash discharge tube passes the water-cooled wall with furnace intercommunication, the ash bucket inner chamber is equipped with adjusting baffle and track, adjusting baffle can follow the track slides from top to bottom.

2. The ash removal device for the secondary air box of the W boiler according to claim 1, which is characterized in that: and the secondary air box side of the ash discharge groove is higher than the hearth side.

3. The ash removal device for the secondary air box of the W boiler according to claim 1, which is characterized in that: the section of the ash bucket is rectangular, the side wall of the ash discharging side of the ash bucket is provided with an opening, and the opening is used for being connected with the ash discharging pipe.

4. The ash removal device for the secondary air box of the W boiler according to claim 1, which is characterized in that: the ash discharge pipe is a through pipe with openings at two ends.

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