CN215831896U

CN215831896U - High-temperature corrosion prevention arrangement structure for water-cooled wall of hearth of cyclone hedging boiler

Info

Publication number: CN215831896U
Application number: CN202121936321.4U
Authority: CN
Inventors: 王静杰; 马占海; 徐彦辉; 祝令昆; 王显山; 杨秀军; 韩升利; 朱慧娟; 姜文婷; 于景泽; 宋欣; 张天武; 曹波; 李晓金; 肖建斌
Original assignee: Huaneng Xinjiang Jimusar Power Generation Co ltd; Harbin Boiler Co Ltd
Current assignee: Huaneng Xinjiang Jimusar Power Generation Co ltd; Harbin Boiler Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-02-15
Anticipated expiration: 2031-08-18

Abstract

The utility model relates to a high-temperature corrosion prevention arrangement structure for a water-cooled wall of a hearth of a rotational flow hedging boiler, belongs to the technical field of boilers and aims to solve the problem that the water-cooled wall of the side wall of the existing coal-fired boiler has high-temperature corrosion. The utility model relates to a high-temperature corrosion prevention arrangement structure for a water-cooled wall of a hearth of a rotational flow hedging boiler. According to the utility model, the angle of the burner nozzle close to the side wall of the hearth is adjusted, so that the burner nozzle is offset towards one side of the center of the hearth in the horizontal direction, and the problem of high-temperature corrosion of the side wall caused by wall brushing of burning flame is avoided. According to the utility model, the plurality of wall-attached air nozzles for ventilating the hearth are respectively arranged on the two sides of the side wall of the hearth, so that the reducing atmosphere in the flue gas near the side wall of the water-cooled wall of the main combustion area of the boiler is effectively controlled, the oxygen content of the flue gas in the area is increased to more than 3%, and the risk and harm of the pulverized coal boiler in an opposed combustion mode for eliminating high-temperature corrosion of the water-cooled wall are effectively reduced.

Description

High-temperature corrosion prevention arrangement structure for water-cooled wall of hearth of cyclone hedging boiler

Technical Field

The utility model relates to the technical field of boilers, in particular to a high-temperature corrosion prevention arrangement structure for a water-cooled wall of a hearth of a rotational flow hedging boiler.

Background

At present, in many large coal-fired power stations in China, after large boilers burning lean coal and poor bituminous coal are put into operation, water-cooled walls in the boilers have high-temperature corrosion problems to different degrees and are distributed in various boiler types. For boilers with front and rear wall opposed firing arrangement, a part of domestic boilers with opposed firing modes still have serious high-temperature corrosion phenomena of water-cooled walls, and the phenomena mainly occur in the water-cooled wall side wall area below the height of a burnout air standard.

The conditions for generating high-temperature corrosion are summarized as follows: 1. the fire coal contains S, Cl and other components capable of generating high-temperature corrosion in certain content, and corrosive gas (such as H) is generated near the water wall₂S); 2. a reducing atmosphere appears near the water-cooled wall, which is mainly characterized by reducing gas CO and low oxygen concentration; 3. the metal wall temperature of the water wall corrosion area is higher, especially above 320 ℃.

At present, for a boiler with front and rear walls arranged in opposed firing manner, the sulfur content of coal as fired is mainly controlled, anticorrosive materials are sprayed on the surfaces of water wall tubes, and jet flow wall-attached air is added at the positions of the front/rear walls, which are close to the water wall of the side wall, to prevent high-temperature corrosion. But the quality of the coal entering the furnace is influenced by objective factors such as coal and carbon markets and the like, and is not easy to control; the spraying of the water-cooled wall is influenced by the spraying material and process, the manufacturing cost is higher, and only the corrosion degree can be delayed; the jet flow wall-attached wind is influenced by a high-temperature flue gas field in the furnace, and can not jet to the middle part of the side wall of the hearth, so that the application effect is limited.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high-temperature corrosion prevention arrangement structure for a boiler furnace water-cooled wall of a cyclone hedging boiler, aiming at solving the problem of high-temperature corrosion of the side wall water-cooled wall of the existing coal-fired boiler.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model discloses a high-temperature corrosion prevention arrangement structure for a water-cooled wall of a hearth of a cyclone hedging boiler.

Furthermore, the included angle between the central line of the burner nozzle and the side wall in the horizontal direction is 5-10 degrees.

Furthermore, a plurality of wall-attached air nozzles used for ventilating the hearth are respectively installed on two sides of the side wall of the hearth.

Further, the side walls on the two sides of the hearth are provided with wall-adherent air bellows, any wall-adherent air nozzle is communicated with the wall-adherent air bellows, and any wall-adherent air bellows is provided with an air inlet.

Furthermore, air inlets of the wall-attached air bellows on two sides of the hearth are communicated with wall-attached air ducts for supplying air.

Further, the adherence tuber pipe with supply air duct on the combustor communicates.

Furthermore, a valve for adjusting air quantity is arranged on the wall-attached air pipe.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the angle of the burner nozzle close to the side wall of the hearth is adjusted, so that the burner nozzle is offset towards one side of the center of the hearth in the horizontal direction, and the problem of high-temperature corrosion of the side wall caused by wall brushing of burning flame is avoided.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.

FIG. 1 is a schematic view of a prior art arrangement of a water wall of a furnace of a cyclone opposed firing boiler;

fig. 2 is a schematic diagram of an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

As shown in figure 1, in the conventional swirl combustion boiler with the front wall 11 and the rear wall 12 arranged in an opposed combustion manner, flame sprayed by the burner 13 is diffused in a hearth at a certain angle, and after the flame sprayed by the burner 13 close to the side wall of the hearth is diffused in the hearth, the flame is sprayed and brushed on the side wall, particularly the spraying and brushing corrosion in the middle area of the side wall is serious.

The utility model will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.

Example 1: the embodiment provides a high-temperature corrosion prevention arrangement structure for a water-cooled wall of a hearth of a swirl hedging boiler, as shown in fig. 2, a plurality of burners 13 are respectively installed on a front wall 11 and a rear wall 12 of the hearth on the same horizontal plane, and respective nozzles of the burners 13 on the front wall 11, which are close to a side wall of the hearth, and the burners 13 on the rear wall 12, which are close to the side wall of the hearth, are biased towards the center of the hearth.

As a preferred embodiment of this embodiment, the included angle β between the central line of the nozzle of the burner 13 and the sidewall in the horizontal direction is 5 ° to 10 °.

As a preferred embodiment of this embodiment, this embodiment further arranges a plurality of wall-attached air nozzles on the side walls on both sides of the furnace, and supplies air to the region near the side walls in the furnace, so as to sufficiently eliminate the reducing atmosphere on the side walls on both sides of the furnace, thereby avoiding the occurrence of high-temperature corrosion. Specifically, a plurality of wall-attached air nozzles used for ventilating the hearth are respectively installed on two sides of the side wall of the hearth.

Further, wall-adhering air bellows 20 are installed on the side walls of the two sides of the hearth, any wall-adhering air nozzle is communicated with the wall-adhering air bellows 20, and any wall-adhering air bellows 20 is provided with an air inlet.

Further, air inlets of the wall-attached air bellows 20 on two sides of the hearth are communicated with wall-attached air pipes 30 for supplying air.

Further, the adherent air duct 30 is communicated with an air supply duct 40 on the burner 13.

Further, a valve 31 for adjusting air volume is arranged on the wall-attached air pipe 30.

Preferably, two ports of the wall-attached air pipe 30 are communicated with air supply pipelines of burners on the front wall and the rear wall of the hearth, and a valve 31 for adjusting air volume is respectively installed at the position, close to the two ports of the wall-attached air pipe 30, on the wall-attached air pipe 30. Alternatively, the valve 31 may be replaced by a damper for adjusting the air volume.

This embodiment can introduce the overgrate air in the adherence wind channel 30 in the secondary wind channel on the blast pipe of follow combustor, generally account for less than 2% of the total amount of wind of boiler, can hardly produce negative effects to the burning in the boiler furnace, this embodiment has controlled the reducing atmosphere in the near flue gas of the side wall of the boiler main combustion area water-cooled wall effectively to improved the flue gas oxygen content in this region to more than 3%, reduced the emergence risk and the harm that opposed firing mode pulverized coal fired boiler eliminated water-cooled wall high temperature corrosion effectively.

This embodiment adherence wind nozzle adopts multiinjector quantity, the nozzle total area is great, the low nozzle is flowed the wind speed, the principle of arranging of dispersion arrangement, the low speed of the efflux that forms the little equivalent diameter of multiinjector quantity just sprays into boiler furnace dispersedly, the momentum of this kind of efflux is less, the easy diffusion of efflux, jet length is shorter, and mix fast and abundant with high temperature flue gas, form the air curtain at the water-cooling wall side wall, reduce the atmosphere of the adjacent air current of side wall water-cooling wall, in order to form the protection to the water-cooling wall.

While the utility model has been described in detail and with reference to specific examples thereof, it will be understood by those skilled in the art that the foregoing examples are for the purpose of illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims

1. The utility model provides a whirl offset boiler furnace water-cooling wall prevents high temperature corrosion arrangement structure which characterized in that: the burner is characterized in that a plurality of burners are respectively installed on the front wall and the rear wall of the hearth at the same elevation, the burners close to the side wall of the hearth on the front wall and the burners close to the side wall of the hearth on the rear wall respectively have the respective nozzle orientation towards the center of the hearth.

2. The arrangement structure for preventing the high-temperature corrosion of the water-cooled wall of the furnace chamber of the cyclone hedging boiler as claimed in claim 1, wherein: the included angle between the central line of the burner nozzle and the side wall in the horizontal direction is 5-10 degrees.

3. The arrangement structure for preventing the high-temperature corrosion of the water-cooled wall of the hearth of the cyclone hedging boiler as claimed in claim 2, wherein: and a plurality of wall-attached air nozzles used for ventilating the hearth are respectively arranged on two sides of the side wall of the hearth.

4. The arrangement structure for preventing the high-temperature corrosion of the water-cooled wall of the furnace chamber of the cyclone hedging boiler as claimed in claim 3, wherein: the side walls on the two sides of the hearth are provided with wall-adherent air bellows, any wall-adherent air nozzle is communicated with the wall-adherent air bellows, and any wall-adherent air bellows is provided with an air inlet.

5. The arrangement structure for preventing the high-temperature corrosion of the water-cooled wall of the furnace chamber of the cyclone hedging boiler as claimed in claim 4, wherein: and air inlets of the wall-attached air bellows on two sides of the hearth are communicated with wall-attached air ducts for supplying air.

6. The arrangement structure for preventing the high-temperature corrosion of the water-cooled wall of the furnace chamber of the cyclone hedging boiler as claimed in claim 5, wherein: the adherence air duct is communicated with an air supply pipeline on the combustor.

7. The arrangement structure for preventing the high-temperature corrosion of the water-cooled wall of the furnace chamber of the cyclone hedging boiler as claimed in claim 6, wherein: and a valve for adjusting air quantity is arranged on the wall-attached air duct.