CN111043589A

CN111043589A - Flow guide beam and method for reducing abrasion of wall-attached wind of water-cooled wall of boiler

Info

Publication number: CN111043589A
Application number: CN201911418797.6A
Authority: CN
Inventors: 高明; 汪勋; 曹学伟; 王春东; 王坤; 任源
Original assignee: Harbin Keneng Cladding Technology Co ltd
Current assignee: Harbin Keneng Cladding Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-21

Abstract

A flow guide beam and a method for reducing the abrasion of wall-attached wind on a water-cooled wall of a boiler relate to a flow guide beam and a method, in particular to a flow guide beam and a method for reducing the abrasion of wall-attached wind on the water-cooled wall of the boiler. The invention aims to solve the problem that the water cooling wall is seriously abraded by wall-attached air in a boiler hearth. The diversion beam comprises an upper plate, a lower plate and a transition plate, wherein the upper plate and the lower plate are both strip-shaped plate bodies, and one long straight edge of the upper plate is connected with one long straight edge of the lower plate into a whole through the transition plate; the method comprises the following specific steps: depositing a high-hardness alloy material layer in a transition region between a dense-phase region and a dilute-phase region which are five to six meters above a hearth castable; horizontally mounting the flow guide beam on the water wall, wherein a water wall pipe is inserted into each upper notch and each lower notch during mounting; and step three, welding the upper plate and the lower plate of the flow guide beam with the fin plate between the water wall tubes. The invention belongs to the field of boiler equipment.

Description

Flow guide beam and method for reducing abrasion of wall-attached wind of water-cooled wall of boiler

Technical Field

The invention relates to a flow guide beam and a method, in particular to a flow guide beam and a method for reducing the abrasion of wall-attached wind on a water-cooled wall of a boiler, and belongs to the field of boiler equipment.

Background

The bed materials of the circulating fluidized bed boiler have two circulating modes in the operation process, one is that the hot flue gas carries the bed materials to rise to the top, enters a separator for collection, then falls to a material returning leg and returns to a hearth again, and the circulation is external circulation; the other is that the water-cooled wall at the periphery of the hearth absorbs heat to cool the hot flue gas in the process that the hot flue gas carrying bed material rises in the middle of the hearth, so that part of the flue gas carrying material flow forms a descending flow due to the increase of density, namely an adherent material flow, the adherent material flow descends to a dense phase region along the side wall of the hearth, the inner circulation is called, the abrasion of a heating surface is determined due to the characteristics of the inner circulation of the circulating fluidized bed boiler, and the abrasion of a water-cooled wall pipe of the boiler is one of the most seriously abraded parts of the heating surface of the boiler.

The reason for the abrasion of the tube wall of the dense-phase zone at the lower part of the hearth and the transition zone of the water wall tube is as follows: firstly, the flow direction of solid material flow descending along the inner wall surface of the hearth is changed in a boundary area, so that the water wall pipe is scoured, and the water wall pipe is abraded; another reason is that the solid material falling from the wall in the transition area moves in the opposite direction to the solid material moving upwards in the furnace, and vortex flow is generated locally to abrade the water wall tubes. The reason for the wear of the walls of the corners around the hearth is that the density of the solid material flowing downward in the inner wall surfaces of the corners is high, and the flowing state is also damaged. The abrasion of irregular area pipe walls such as wall penetrating pipes at thermometers, differential pressure gauges and the like is mainly caused by the fact that the irregular pipe walls cause large disturbance to local flow characteristics.

Disclosure of Invention

The invention provides a flow guide beam and a method for reducing the abrasion of wall-attached wind on a water cooling wall of a boiler, aiming at solving the problem that the wall-attached wind in a boiler hearth seriously abrades the water cooling wall.

The technical scheme adopted by the invention for solving the problems is as follows: the diversion beam comprises an upper plate, a lower plate and a transition plate, wherein the upper plate and the lower plate are both strip-shaped plate bodies, and one long straight edge of the upper plate is connected with one long straight edge of the lower plate into a whole through the transition plate.

Furthermore, the upper plate, the lower plate and the transition plate form a beam body with an isosceles trapezoid cross section.

Furthermore, a plurality of upper notches are arranged on the other long straight edge of the upper plate along the length direction of the upper plate, a plurality of lower notches are arranged on the other long straight edge of the lower plate along the length direction of the lower plate, and the upper notches correspond to the lower notches one to one.

Furthermore, the upper notch and the lower notch are both arc-shaped.

The method comprises the following specific steps:

depositing a high-hardness alloy material layer in a transition region between a dense-phase region and a dilute-phase region which are five to six meters above a hearth castable;

horizontally mounting the flow guide beam on the water wall, wherein a water wall pipe is inserted into each upper notch and each lower notch during mounting;

and step three, welding the upper plate and the lower plate of the flow guide beam with the fin plate between the water wall tubes.

Further, the thickness of the high-hardness alloy material layer is not less than 1.6 mm.

The invention has the beneficial effects that: the invention combines the wear resistance of high-hardness alloy deposition and the advantages of the diversion beam that the backflow materials are blocked and the wall flow is reduced; the invention can well solve the problem that the root of the guide beam is damaged by the abrasion of the backflow eddy current during operation; the invention can calculate and determine the height of the lower area of the hearth to adopt deposition abrasion resistance according to the fluidization speed, coal conditions and the like of the boiler, solves the problem that other areas with relatively serious abrasion can adopt deposition to be used as a bottom layer, and then is additionally provided with the flow guide beam, thereby effectively reducing the abrasion of the water-cooled wall of the hearth, and generally preventing the abrasion of the whole hearth for more than 5 years; the invention effectively solves the problem of root abrasion of the pure flow guide beam, the organic combination of the two can well reduce the relatively high cost of a large amount of deposited abrasion resistance, the abrasion resistance of the two can reach more than 5 years after the two are combined, and the cost is greatly reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the construction of a flow beam;

FIG. 3 is a top view of the deflector beam;

fig. 4 is a bottom view of the deflector beam.

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 4, and the flow guide beam for reducing the wind abrasion of the boiler water wall comprises an upper plate 1, a lower plate 2 and a transition plate 3, wherein the upper plate 1 and the lower plate 2 are both strip-shaped plate bodies, and one long straight edge of the upper plate 1 is connected with one long straight edge of the lower plate 2 through the transition plate 3 into a whole.

The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 4, and the upper plate 1, the lower plate 2 and the transition plate 3 of the flow guide beam for reducing the abrasion of the wall-attached wind of the boiler water-cooled wall in the embodiment form a beam body with an isosceles trapezoid cross section. Other components and connections are the same as those in the first embodiment.

The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, and in the embodiment, a plurality of upper notches 1-1 are arranged along the length direction of an upper plate 1 of another long straight edge of a flow guide beam 1 for reducing the abrasion of wall-attached wind of a water cooling wall of a boiler, a plurality of lower notches 2-1 are arranged along the length direction of a lower plate 2 of another long straight edge of the lower plate 2, and the upper notches 1-1 correspond to the lower notches 2-1 one by one. Other components and connections are the same as those in the first embodiment.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, and both the upper notch 1-1 and the lower notch 2-1 of the flow guide beam for reducing the wind abrasion of the boiler water wall are arc-shaped. Other components and connection relationships are the same as those in the third embodiment.

The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, and the method for reducing the abrasion of the boiler water wall against the wall wind in the embodiment is realized by the following steps:

step one, depositing a high-hardness alloy material layer 4 in a transition area between a dense-phase area and a dilute-phase area which are five to six meters above a hearth castable;

horizontally installing the flow guide beam on the water wall 5, wherein a water wall tube 5-1 is inserted into each upper notch 1-1 and each lower notch 2-1 during installation;

and step three, welding the upper plate 1 and the lower plate 2 of the flow guide beam with the fin plates 5-2 between the water wall tubes 5-1.

The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 4, and the thickness of the high hardness alloy material layer 4 is not less than 1.6mm in the steps of the method for reducing the abrasion of the boiler water wall against the wall wind in the present embodiment.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a reduce water-cooled wall of boiler and paste wall wind wearing and tearing's water conservancy diversion roof beam which characterized in that: the flow guide beam for reducing the wind abrasion of the wall-attached boiler water-cooling wall comprises an upper plate (1), a lower plate (2) and a transition plate (3), wherein the upper plate (1) and the lower plate (2) are both strip-shaped plate bodies, and a long straight edge of the upper plate (1) is connected with a long straight edge of the lower plate (2) into a whole through the transition plate (3).

2. The flow guide beam for reducing the wind abrasion of the boiler water wall, which is attached to the wall, is characterized in that: the upper plate (1), the lower plate (2) and the transition plate (3) form a beam body with an isosceles trapezoid cross section.

3. The flow guide beam for reducing the wind abrasion of the boiler water wall, which is attached to the wall, is characterized in that: the other long straight edge of the upper plate (1) is provided with a plurality of upper notches (1-1) along the length direction of the upper plate (1), the other long straight edge of the lower plate (2) is provided with a plurality of lower notches (2-1) along the length direction of the lower plate (2), and the upper notches (1-1) are in one-to-one correspondence with the lower notches (2-1).

4. The flow guide beam for reducing the wind abrasion of the boiler water wall, which is attached to the wall, is characterized in that: the upper gap (1-1) and the lower gap (2-1) are both arc-shaped.

5. A method for reducing the wall-mounted wind abrasion of a water-cooled wall of a boiler is characterized by comprising the following steps: the method for reducing the wall-mounted wind abrasion of the water-cooled wall of the boiler is realized by the following steps:

step one, depositing a high-hardness alloy material layer (4) in a transition area between a dense-phase area and a dilute-phase area which are five to six meters above a hearth castable;

horizontally mounting the flow guide beam on the water wall (5), wherein a water wall tube (5-1) is inserted into each upper notch (1-1) and each lower notch (2-1) during mounting;

and step three, welding the upper plate (1) and the lower plate (2) of the flow guide beam with the fin plates (5-2) between the water wall tubes (5-1).

6. The method for reducing the wind abrasion of the boiler water wall, which is attached to the wall, of claim 5, is characterized in that: the thickness of the high-hardness alloy material layer (4) is not less than 1.6 mm.