JPH09126435A - Coal burning boiler flue part drift preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a drift at a gap between the side wall of a flue and the end part of a heat transfer pipe by a method wherein a vertical drift prevention plate having one side making contact with the side wall of a flue and the other side inserted between panel-form heat transfer groups is mounted between drift preventing plates. SOLUTION: Vertical drift prevention plates 4 are arranged between a panel- form heat transfer group 2 and a flue wall 1. Namely, a vertical drift prevention plate 4 having making contact with a side wall 1 of the flue and the opposite other side inserted between panel-form heat transfer pipe groups 2 is mounted between horizontal drift preventing plates disposed in such a state to extend the vicinity of the upper and lower ends of the heat transfer pipe group 2. A space between the end part of a panel-form heat transfer pipe group 2 and a side wall 1 of the flue is filled with the vertical drift prevention plate 4 and by filling a space between panels at the end part of the panel-form heat-transfer pipe group 2, fluid resistance against a flow of gas containing combustion ash in fuel ash in the spaces is increased and a flow rate of a flow of gas flowing in such a state to be deviated to the part is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing uneven flow in a flue portion of a coal-fired boiler used for commercial or private power generation to prevent coal ash erosion.

[0002]

2. Description of the Related Art FIG. 6 shows a structure of a conventional flue section of a coal-fired boiler as seen in a vertical section. In the flue portion of FIG. 6, hot gas is directed down the flue 1 from above. Flue 1
A panel-shaped heat transfer tube group 2 is arranged in the inside, and a flat plate-shaped horizontal drift prevention plate 3 of a type protruding from the flue wall 1 is installed above and below the heat transfer tube group 2, respectively. .

[0003]

With the drift prevention plate 3 in the boiler flue portion according to the prior art shown in FIG. 6, in the vicinity of the upper drift prevention plate 3 as shown by the gas flow streamlines 5 shown in this figure. , The gas flow 5 is separated from the flue wall 1, but on the downstream side, it is biased to a gap having a small flow resistance between the flue wall 1 and the end of the panel-shaped heat transfer tube, and the gas flow rate in this gap is Will increase.

Thus, the flow rate increases at the end of the panel-shaped heat transfer tube, and the erosion of the heat transfer tube wall is promoted by the flow velocity of the gas and the amount of combustion ash contained in the gas, and eventually a hole is formed, The steam spews up to an accident.

According to the present invention, in a flue of a coal-fired boiler in which a panel-shaped heat transfer tube group is arranged, a horizontal drift prevention plate is provided which extends from the side wall of the flue tube to near the upper and lower ends of the heat transfer tube group. An object of the present invention is to provide a boiler flue portion drift prevention device that prevents the occurrence of drift in the gap between the side wall of the flue and the end of the heat transfer tube.

[0006]

In order to solve the above problems, the present invention provides a space between a panel-shaped heat transfer tube group end portion and a flue wall, and a panel-shaped heat transfer tube group end portion panel. A shelf-like vertical drift prevention plate composed of flat plates is installed so as to fill the space between the panels.

That is, according to the present invention, one side is in contact with the side wall of the flue and the other side which is opposed is a panel-shaped transfer between the horizontal drift prevention plates extending near the upper and lower ends of the heat transfer tube group. (EN) Provided is a drift prevention device for a coal-fired boiler flue part, which is equipped with vertical drift prevention plates inserted between heat pipe groups.

According to this non-uniform flow prevention device of the present invention, the vertical non-uniform flow prevention plate fills the space between the end portion of the panel-shaped heat transfer tube group and the flue wall, and the end portion of the panel-shaped heat transfer tube group is formed. By filling the spaces between the panels, the flow resistance to the gas flow containing combustion ash in these spaces is increased, and thus the flow rate of the gas flow containing combustion ash that is biased in this part is increased. Reduce.

In the above-mentioned drift prevention device of the present invention,
If a large number of holes are provided inside the flue of the horizontal anti-diffusion plate, a small amount of gas flow will occur through the holes, which will alleviate the gas flow lift by the upper flat plate and It is preferable for preventing local gas flow.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A drift prevention device for a coal-fired boiler flue portion according to the present invention will be specifically described below with reference to an embodiment shown in FIGS. In the following embodiments, the same components as those of the conventional device shown in FIG. 6 are designated by the same reference numerals for simplification of description.

In the drift prevention device according to this embodiment, a vertical drift prevention plate 4 is installed in the space between the panel-shaped heat transfer tube group 2 and the flue wall 1. That is, in the drift prevention device according to this embodiment, one side is in contact with the side wall 1 of the flue between the horizontal drift prevention plates 3 extending near the upper and lower ends of the heat transfer tube group 2 and facing each other. A vertical non-uniform flow prevention plate 4 having its side inserted between the panel-shaped heat transfer tube groups 2 is mounted.

According to the non-uniform flow prevention device of the present embodiment, the vertical non-uniform flow prevention plate 4 fills the space between the end of the panel-shaped heat transfer tube group 2 and the side wall 1 of the flue, and also the panel-shaped transmission. By filling the spaces between the panels at the ends of the heat pipe group 2 with each other, the flow resistance to the gas flow containing the combustion ash in these spaces is increased, whereby the combustion ash that flows unevenly in this portion is increased. The flow rate of the included gas stream can be reduced.

FIG. 2 shows a streamline 5 of a gas flow containing combustion ash when the vertical drift prevention plate 4 according to the present invention is provided. As shown in this figure, it is expected that the deviation of the gas flow to the flue wall is prevented.

In this non-uniform flow prevention device, if a large number of holes 6 are bored as shown in FIG.
To allow a small amount of gas flow to the upper flat plate 3
It is preferable for alleviating the gas flow up due to the above and preventing the local gas flow from increasing at this portion.

[0015]

As described above, the coal-fired boiler flue portion drift prevention device according to the present invention is provided between the horizontal drift prevention plates provided so as to extend from the side wall of the flue to near the upper and lower ends of the heat transfer tube group. The side wall of the flue is in contact with one side, and the opposite side is provided with a vertical non-uniform flow prevention plate inserted between the panel-shaped heat transfer tubes.

With this vertical non-uniform flow prevention plate, combustion into the space between the end of the panel-shaped heat transfer tube group and the flue wall, and the space between the panel at the end of the panel-shaped heat transfer tube group, etc. Reduce the flow rate of gas containing ash.

After all, when the drift prevention device of the present invention is provided, the erosion of the heat transfer tube wall due to the combustion ash is reduced and the life of the boiler is increased.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view taken along the line BB of FIG. 2, showing an overall structure of a drift prevention device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view of a C portion of FIG.

FIG. 4 is a perspective view partially showing a horizontal drift prevention plate and a vertical drift prevention plate in the drift prevention device according to the first embodiment of the present invention.

FIG. 5 is a perspective view partially showing a horizontal drift prevention plate and a vertical drift prevention plate in the drift prevention device according to the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing the overall structure of a conventional drift prevention device.

[Explanation of symbols]

 1 Side wall of flue 2 Panel-shaped heat transfer tube group 3 Horizontal drift prevention plate 4 Vertical drift prevention plate 5 Gas flow 6 holes

Claims (2)

[Claims] 1. A non-uniform flow prevention device having a horizontal non-uniform flow prevention plate provided in a flue of a coal-fired boiler in which a panel-shaped heat transfer tube group is arranged, the horizontal anti-drift plate extending from a side wall of the flue tube to near upper and lower ends of the heat transfer tube group. In the apparatus, coal is characterized in that a vertical non-uniform flow prevention plate is attached between the non-uniform flow prevention plates, one side of which is in contact with the side wall of the flue and the other opposite side is inserted between the panel-shaped heat transfer tube groups. Boiler flue part drift prevention device. 2. The coal-fired boiler flue portion drift prevention device according to claim 1, wherein a large number of holes are provided in a portion of the horizontal drift prevention plate inside the flue.