JPH10103610A - Boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent buck stays and side walls from being mismatched through deformation by providing an inside furnace wall on a diagonal line of a quadrangle and joining the buck stays mutually at the respective corners of the quadrangle in a manner of barring each buck stay from displacement by virtue of another buck stay on the opposed side. SOLUTION: A boiler is square in a plane figure as a whole and divided into two parts by a diagonal line with each of the plane figures consisting of an equilateral right-angled triangle. The inside of a corner part in which plane figures are opposed, that is, the inside of a corner part in which parts are structurally opposed, is connected by an inside furnace wall 22. In this part with vertices the side walls 1, 3, 4, 6 and the buck stays 10-13 are mutually joined, and the opposed side walls (1, 3), (4, 6) and the buck stays (12, 13), (14, 16) bar the part from protuberating. In this manner the buck stays 10-13 and the side walls 1, 3, 4, 6 can be freed from being mismatched through deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a boiler for a thermal power plant.

[0002]

2. Description of the Related Art FIG. 4 is a two side view of a conventional boiler.
(A) is a top view and (b) is a longitudinal sectional view. FIG. 5 is a perspective view of the boiler furnace. In the figure, A is a furnace, B
Indicates a rear flue, portions denoted by reference numerals 1 to 3 are furnace side walls, respectively, and portions denoted by reference numerals 4 to 6 are rear flue side walls, respectively. The portions denoted by reference numerals 3 and 4 form one side wall, and the portions denoted by reference numerals 1 and 6 form the opposite side wall. 7 is an inner furnace wall,
The boundary between the side walls 3 and 4 and the boundary between the side walls 1 and 6 are joined. The inner furnace wall 7 is provided in the lower half of the connection between the upper part of the furnace A and the rear flue B, and the gas passes above the inner furnace wall 7.

[0003] The furnace side wall and the rear flue side wall are a collection of tubes through which water passes. This is heated by the burner 8 at the lower part of the boiler, and the water in the tube becomes high-temperature and high-pressure steam sequentially.

FIG. 6 is a horizontal sectional view of the boiler. In the drawings, members denoted by reference numerals 10 to 13 are backstays. The high temperature and high pressure gas inside the boiler causes the side wall to bulge outward. Since the side wall itself does not have sufficient rigidity, a back stay is provided around the periphery to suppress deformation.

FIGS. 7A and 7B are partially enlarged sectional views of the boiler, wherein FIG. 7A is a horizontal sectional view of a corner portion, and FIG. 7B is a sectional view taken along line AA of FIG. Each backstay is connected via an end jig 17 and connecting rods 18 and 19 as shown in the figure. The deformation of the side wall to the outside is suppressed by the bending rigidity of the back stay, and the back stay is supported by the tensile rigidity of the adjacent back stay. Backstay 10
And the tube 15 on the side wall are the holder 9, the holder support plate 1
4. It is connected via a holding jig 16.

[0006]

In the conventional structure, as shown in FIG. 6, since the inner furnace wall 7 is attached to the boundary between the side walls 3 and 4 and the boundary between the side walls 1 and 6, The vicinity of the side wall connected to the furnace wall 7 cannot be largely deformed outside. On the other hand, the back stays 10 and 12 are supported only at both end portions by the adjacent back stays 11 and 13, and can be deformed outward since the center portion is not supported. Therefore, the deformation mismatch between the backstay and the side wall is greatest near the side wall connected to the inner furnace wall. For this reason, the deformation of the holder 9 connecting the backstay and the furnace wall is greatest at this portion. Since a large repetitive load is applied to the holder 9 every time the boiler starts and stops, there is a problem that the holder 9 is in a severe condition in terms of fatigue strength.

FIG. 8 shows a device for avoiding the above-mentioned problem, and is a horizontal sectional view of another example of a joint portion between the inner furnace wall and the side wall. In this case, a furnace wall support jig 20 is provided on the side wall side of the intersection of the inner furnace wall 7 and the side wall, and the furnace wall support jig 2 is further provided.
A holder beam 21 is provided between the backstay 10 and the backstay 10. Thereby, the deformation of the holder 9 near the inner furnace wall 7 can be prevented from increasing. However, adding such a device is extra labor and cost.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to provide a boiler free from deformation mismatch.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a vertically long furnace having a number of vertical tubes and a side wall having a number of vertical tubes. The furnace comprises a rear flue connected to the upper side surface of the furnace and communicating with the inside of the furnace, and both ends of the lower part of the connection portion are connected to a boundary between the furnace side wall and the rear flue side wall. A boiler having a horizontal backstay having ends connected to each other on the outer surfaces of the furnace and the rear flue, wherein the furnace and the rear flue are formed to have a triangular planar shape. The upper part of one side of the furnace and the one side of the rear flue are connected to communicate with each other so that the plane shape is rectangular, and both ends face the boundary between the furnace side wall and the rear flue side wall. Square flat connected to the inside of the formed corner The inner furnace walls forming a diagonal relates boiler, characterized in that provided in the lower half of the connecting part in the form.

In the present invention, the inner furnace wall is provided on a square diagonal line. In the square corner portions, the back stays are connected to each other, and the displacement is restricted by the back stays on the other side. Since both ends of the inner furnace wall are connected to the positions where they are not displaced, no deformation mismatch occurs.

[0011]

1 is a two-sided view of a boiler according to the present invention, wherein (a) is a top view and (b) is a longitudinal sectional view. FIG.
Is a perspective view of the boiler. In the figure, A is a furnace, B is a rear flue, 1, 3 are furnace side walls, 4, 6 are rear flue side walls, and 22 is an inner furnace wall. In this boiler, the overall planar shape is a square, divided into two parts by a diagonal line, and each planar shape is a right-angled isosceles triangle. At the connection between furnace A and rear flue B,
The inner furnace wall 22 is located at a position connecting the vertices of the square in the planar shape.
Is provided. This is provided in the lower half of the connection between the furnace A and the rear flue B, and the gas passes above the inner furnace wall 22.

FIG. 3 is a horizontal sectional view of the boiler. In the figure, 1 and 3 are furnace side walls, 4 and 6 are rear flue side walls 1
Reference numerals 0, 11, 12, and 13 denote back stays, and reference numeral 22 denotes an inner furnace wall. In the prior art (FIG. 6), the swelling of the inner side walls (3, 4 and 1, 6) is restrained, and the swelling of the outer backstay 10 is not restrained. However, in the present embodiment, the opposing vertices of the plane figure, that is, the inside of the structurally opposing corners, are connected by the internal furnace wall 22. The side wall and the back stay are both connected by the same structure as the end jig 17 shown in FIG. 7, and the bulge is restrained by the opposite side wall and the back stay. No deformation mismatch occurs. In the present embodiment, the furnace wall support jig 20 and the holder beam 2 shown in FIG.
Since a complicated member such as 1 is not required, the structure is simple.

In the boiler of the above embodiment,
Although the plane shapes of the furnace and the rear flue are shown as isosceles triangles, the plane shapes of the furnace and the rear flue may be equilateral triangles or triangles of other shapes. Therefore, the overall planar shape does not necessarily have to be a square. That is, it may be a square.

[0014]

According to the boiler of the present invention, the furnace and the rear flue are formed in a triangular shape in plan view, and the upper part of one side of the furnace and one side of the rear flue are connected to form an interior. The inner furnace wall is formed so as to communicate with each other so as to have a rectangular planar shape, and both ends are connected to the inside of a corner portion formed facing the boundary between the furnace side wall and the rear flue side wall and are diagonal in the rectangular planar shape. Is provided in the lower half of the connecting portion, so that there is no deformation mismatch between the back stay and the side wall, and a highly reliable boiler that can withstand a large repetitive load can be provided.

[Brief description of the drawings]

FIG. 1 is a two-sided view of a boiler according to one embodiment of the present invention, wherein (a) is a top view and (b) is a longitudinal sectional view.

FIG. 2 is a perspective view of the boiler.

FIG. 3 is a horizontal sectional view of the boiler.

FIG. 4 is a two-sided view of a conventional boiler, where (a) is a top view and (b) is a longitudinal sectional view.

FIG. 5 is a perspective view of a conventional boiler.

FIG. 6 is a horizontal sectional view of a conventional boiler.

FIG. 7 is a partially enlarged sectional view of a conventional boiler, and FIG.
2 is a horizontal sectional view of a corner portion, and FIG. 2B is a sectional view taken along line AA of FIG.

FIG. 8 is a horizontal cross-sectional view of another example of the joint between the furnace side wall and the internal furnace wall of the conventional boiler.

[Explanation of symbols]

1, 2, 3 Furnace side wall 4, 5, 6 Rear flue side wall 7 Inner furnace wall 8 Burner 9 Holder 10 to 13 Back stay 14 Holder support plate 15 Boiler tube 16 Jig for connecting holder support plate and boiler tube 17) End jig of the holder support plate 18 Connection rod for connecting the end jig of the holder support plate and the backstay 19 Connection rod for connecting the end jig of the holder support plate and the backstay 20 Furnace wall support jig Tool 21 Holder beam 22 Inner furnace wall

Claims (1)

[Claims] 1. A vertically long furnace having a plurality of vertical tubes and a side wall comprising a plurality of vertical tubes, the furnace being connected to an upper side surface of the furnace and communicating with the inside of the furnace. The lower half of the connection section has an inner furnace wall connected at both ends to a boundary between the furnace side wall and the rear flue side wall, and has an end on an outer surface of the furnace and the rear flue. In a boiler provided with horizontal backstays whose parts are connected to each other, the furnace and the rear flue are formed in a triangular shape in plan, and are connected by the upper part of one side of the furnace and one side of the rear flue. The inside is communicated to make the plane form a square, and both ends are connected inside the corner formed facing the boundary between the furnace side wall and the rear flue side wall, and the diagonal line is formed in the square plane. The inner furnace wall to be A boiler characterized by being boiled.