JPH04115204U - boiler furnace wall - Google Patents

Abstract

(57) [Summary] [Purpose] To control the deformation of the lower end of the sub-side wall to relieve stress concentration, prevent cracks from occurring at the lower end, and prevent damage to the boiler. [Structure] A plurality of reinforcing members 15 are fixed to the boundary between the side wall of the furnace 1 and the sub-side wall 3, and the reinforcing members 15 are attached to the lower end 9 of the sub-side wall 3. Make it bear some of the concentrated stress.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is designed to prevent cracks from occurring at the lower end of the side wall of the secondary side wall. This concerns the boiler furnace wall.

0002

[Conventional technology]

To explain the conventional boiler and boiler furnace wall with reference to Fig. 3, the main body of the boiler is The side wall of the furnace 1 and the side wall of the rear heat transfer section 2 are connected by a sub side wall 3. The heat transfer section 2 is suspended from a tower-shaped steel frame 4 by a hanging rod 5. Furnace 1 , the rear heat transfer section 2, and the sub-side wall 3 are constructed by arranging a large number of tubes such as superheater tubes in parallel and installing a filter between each tube. The lower and upper parts of the sub-side wall 3 are connected with an inlet header 6 and an outlet header 6. A header 7 is attached.

0003 The fuel is blown into the lower part of the furnace 1 and burned, and the combustion gas is transferred from the lower part of the furnace 1 to the rear. It is sent to the heating section 2 and exhausted to the outside through a flue (not shown). Furthermore, the upper part of furnace 1 A drum or steam separator 8 is attached to the rear heat transfer section 2. , a superheater, reheater, energy saver, etc. (not shown) are installed to heat water and steam. The sea urchin is turning.

0004

[Problem that the idea aims to solve]

In such a boiler, there are cracks in the lower ends 9, 9' of the sub-side wall 3, especially in the vicinity of 9. The problem was that this occurred.

[0005] Originally, the lower end 9 of the sub-side wall 3 has a shape where stress tends to concentrate, and the furnace 1 This is due to the difference in thermal expansion due to the temperature difference between the side wall and the sub-side wall 3 (the temperature of the sub-side wall 3 is higher). As a result, a large deformation occurs at the lower end 9 of the secondary side wall 3, and this deformation is caused by the response to the lower end 9. This will further adversely affect the concentration of force, and cracks will occur in the lower end 9. It is considered a thing.

[0006] When such cracks occur, combustion gas and steam can leak from the boiler furnace wall. This is currently a problem as there is a risk of damage to the boiler or damage to the boiler.

[0007] In view of the above-mentioned circumstances, the present invention reduces stress concentration by regulating the deformation of the lower end of the sub-side wall. and to provide a boiler furnace wall that can prevent cracks from occurring at the lower end. The purpose is to

[0008]

[Means to solve the problem]

The present invention is based on a boiler furnace wall that combines the furnace side wall and the rear heat transfer section side wall with a sub-side wall. and a plurality of reinforcing members extending between the furnace side wall and the secondary side wall. fixed to the boiler furnace wall at the required intervals in the vertical direction. It is something.

[0009]

[Effect]

During boiler operation, the temperature of the sub side wall is higher than that of the furnace side wall, and the temperature difference Due to the difference in thermal expansion due to The secondary sidewall tube of the section tries to deform, but the secondary sidewall tube is prevented by a plurality of reinforcing members. Bending in the radial direction and elongation in the axial direction are restricted.

0010

【Example】

Embodiments of the present invention will be described below based on the drawings.

[0011] Figures 1 and 2 show an embodiment of the present invention, which has the same configuration as the conventional one shown in Figure 3. This figure shows the boundary between the furnace 1 side wall and the sub-side wall 3 of the boiler.

0012 The side wall of the furnace 1 has a large number of furnace wall tubes 10 arranged in parallel, and fins 1 are installed between the furnace wall tubes 10. 1, and the sub-side wall 3 has a structure in which a number of sub-side wall pipes 12 (constituting the side wall of the furnace 1 pipes with different metal temperatures) are arranged in parallel, and a fin 1 is installed between each sub-side wall pipe 12. It has a configuration in which 3 are connected.

[0013] At the boundary between the furnace 1 side wall and the sub-side wall 3, there is a straddle between the furnace 1 side wall and the sub-side wall 3. A plurality of reinforcing members 15 are fixed at required intervals in the vertical direction.

[0014] In this embodiment, the reinforcing material 15 is provided in front on one side of the angle iron, as shown in FIG. A semicircular notch 16 that follows the outer circumferential surfaces of the hearth wall tube 10 and the auxiliary side wall tube 12 is formed. One side of the angle iron is placed at the boundary between the side wall of the furnace 1 and the sub-side wall 3. Welded to the furnace wall tube 10, sub-side wall tube 12, and fins 11, 13. There is.

[0015] In addition, in FIG. 1, 14 is an arch-shaped notch formed at the lower end of the fin 13.

[0016] Since the configuration is as described above, the temperature of the sub-side wall 3 is lower than that of the furnace 1 during boiler operation. It is higher than the side wall, and due to the difference in thermal expansion due to the temperature difference, the boundary with the side wall of furnace 1 is Although the secondary sidewall tube 12 at the lower end 9 of the secondary sidewall 3 located in the boundary portion attempts to deform, The secondary side wall tube 12 is bent in its radial direction and its axis by a plurality of reinforcing members 15. Growth in the direction is restricted.

[0017] That is, the plurality of reinforcing members 15 absorb a portion of the stress concentrated on the lower end 9 of the sub-side wall 3. As a result, the stress concentration on the lower end 9 is reduced and the crack is reduced. This prevents damage to the boiler.

[0018] Note that the boiler furnace wall of the present invention is not limited to the above-mentioned embodiments. Of course, various changes can be made without departing from the gist of the invention.

[0019]

[Effect of the idea]

As explained above, according to the boiler furnace wall of the present invention, the deformation of the lower end of the sub-side wall can be prevented. control to alleviate stress concentration and prevent cracks from occurring at the lower end. , can have an excellent effect of preventing damage to the boiler.

[Brief explanation of drawings]

FIG. 1 is a side view of the vicinity of the boundary between a furnace side wall and a sub-side wall, showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of essential parts in an embodiment of the present invention.

FIG. 3 is an overall schematic side view of the boiler.

[Explanation of symbols]

1 Furnace 2 Rear heat transfer section 3 Secondary side wall 9 Lower end 10 Furnace wall tube 12 Secondary side wall pipe 15 Reinforcement material

Claims (1)

[Scope of utility model registration request] 1. A boiler furnace wall formed by connecting a furnace side wall and a rear heat transfer section side wall with a sub-side wall, the furnace side wall and the sub-side wall having a plurality of reinforcing members extending between the furnace side wall and the sub-side wall. A boiler furnace wall characterized by being fixed at required intervals in the vertical direction.