JPH1137689A - Support lug of heat conductive pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To see that a lug does not drop from a supporting plate by equipping the downside with a downward guide groove to engage slidably with the upper guide face of the supporting plate, and attaching a lug to the downside of the loop-shaped bend of a heat conductive pipe, and attaching a slip off preventive plate to the lug adjacently from below the under guide face of the supporting plate. SOLUTION: A supporting plate 16 to be extended from a heat conductive pipe 2 to the inside of a heat conductive part 6 is welded to the sidewall 4 of the heat conductive pipe 2, and the supporting plate 16 is equipped with an upper guide face 16a positioned at the topside in the direction of its extension and a lower guide face 16b positioned at the downside, and the roughly center on the upper guide face 16a is equipped with a seat 17a for a lug 17 being attached to the underside of the loop-shaped bend of the heat conductive pipe 10, in the direction of crossing the supporting plate 16. Then, a guide groove 18 is made at the bottom of the seat 17a, and a band-shaped slip off preventive plate 19 is fixed to surround the supporting plate closely from below to the lower guide face 16b of the supporting plate 16, to the outside of the tip of the side plate 17b of the lug 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support lug for supporting a heat transfer tube on a heat transfer portion side wall of a boiler for thermal power generation.

[0002]

2. Description of the Related Art In a boiler used for thermal power generation, various heaters constituted by heat transfer tubes are provided, and a support lug is provided between the heater and a side wall of a heat transfer portion of the boiler. One example is shown in FIGS.

[0003] The boiler 1 comprises a furnace 5 and a heat transfer section 6 surrounded by a heat transfer section side wall 4 composed of heat transfer tubes 2 and fins 3 as shown in Figs. Furnace 5
Inside, a burner 7 for burning fuel of heavy oil or pulverized coal is provided, and an exhaust gas passage 8 for discharging exhaust gas is connected to the heat transfer unit 6, and inside the heat transfer unit 6, Various heaters 9 such as reheaters, superheaters, and economizers for heating water or steam by the heat of the combustion gas are provided.

As shown in FIG. 5, a heater 9 is formed by bending a plurality of linear portions in the vicinity of the heat transfer portion side wall 4 a plurality of times so that a plurality of linear portions are vertically arranged at intervals in the left-right direction. The heat transfer tube 10 is formed in a flat shape, and the heat transfer tube 10
Are arranged in a direction perpendicular to the plane of the paper of FIG.

[0005] A long plate-shaped or rod-shaped anti-vibration bracket 11 extending from above a fixing member (not shown) in the heat-transfer section 6 is provided in the straight portion of the heat transfer tube 10. ,
The contact between adjacent flat heat transfer tubes 10 is prevented.

A support lug 14 composed of a support plate 12 and a lug 13 is provided between the lower surface of the loop-shaped bent portion of the heat transfer tube 10 and the side wall 4 of the heat transfer portion.

As shown in FIG. 6, the support plate 12
It extends from the heat transfer tube 2 forming the heat transfer portion side wall 4 to the vicinity of the lower surface of the loop-shaped bent portion of the heat transfer tube 10 and refracts the inner front end portion so as to be parallel to the heat transfer portion side wall 4. A guide surface 12a is formed on the upper surface of the heat transfer portion so as to extend horizontally along the heat transfer portion side wall 4, and the lug 13 extends from the lower surface of the loop portion of the heat transfer tube 10 in the direction of the heat transfer portion side wall 4. The guide surface 1 extends to the middle part and is formed in the extending direction.
A guide groove 13a mounted on 2a is provided on the lower surface.

As described above, the guide groove 13a on the lower surface of the lug 13 is slidably fitted to the guide surface 12a of the support plate 12 from above, so that the weight of the heat transfer tube 10 is reduced via the support lug 14. It is supported by the heat transfer section side wall 4.

When the fuel is burned by the burner 7 in the furnace 5, the generated combustion gas flows to the heat transfer section 6 and flows through the heat transfer tube 10.
The water that is introduced into the exhaust gas passage 8 while heating the water therein, and that is heated by the heat transfer tubes 2 and 10 is supplied as steam to a turbine (not shown) to generate power.

When the combustion gas heats the water in the heat transfer tube 10, the heat transfer tube 10 also expands due to thermal expansion, and the axial direction of the linear portion of the heat transfer tube 10 (X-axis direction in FIG. 6). When the lug 13 and the support plate 12 slide relative to each other in the direction in which the guide groove 13a extends, the elongation caused by thermal expansion or the like is absorbed by the lug 13 and the support plate 12 in the horizontal direction (see FIG. 6). (The Y-axis direction) due to thermal expansion or the like is absorbed by the relative sliding of the lug 13 and the support plate 12 in the extension direction of the guide surface 12a.

If the elongation due to thermal expansion or the like is large, the heat transfer tube 10 is locked at the end of the guide groove 13a with respect to the axial direction (X-axis direction in FIG. 6) of the linear portion, and In the horizontal direction (the Y-axis direction in FIG. 6) of the side wall 4, it is locked at the end of the guide surface 12a.

[0012]

However, in the above-described conventional support lug 14, when the heated heat transfer tube 10 expands, the heat transfer tube 10 moves in the front-rear and left-right directions (X and Y axis directions in FIG. 6). And the lug 13 may come off (in the Z-axis direction in FIG. 6), so that the lug 13 comes off the guide surface 12a of the support plate 12, and the heat transfer tube 1
There is a problem that it becomes impossible to support 0.

The present invention has been made in view of the above circumstances, and has as its object to provide a support lug for a heat transfer tube that prevents the lug from coming off the support plate due to thermal expansion of the heat transfer tube.

[0014]

A support lug for a heat transfer tube according to the present invention is a support lug for a heat transfer tube that supports a loop-shaped heat transfer tube on a side wall of the heat transfer portion, and is provided between the heat transfer portion side wall and the heat transfer portion inside. A support plate having a guide surface extending to the upper and lower sides, a stopper portion protruding upward and downward from the inner tip, and a downward guide groove slidably fitted to the upper guide surface. A lug attached to the lower surface of the loop-shaped bent portion of the heat transfer tube is provided on a lower surface, and a strip-shaped detachment prevention plate attached to the lug is provided near the lower guide surface from below.

The longitudinal expansion and contraction caused by the thermal expansion of the heat transfer tube is absorbed by the sliding of the support plate and the lug by the guide groove and the guide surface, and when the expansion is large, the stopper portion and the width end of the guide groove. In addition, the lift due to the thermal expansion of the heat transfer tube is locked by the plate for preventing the support lug of the heat transfer tube from coming off, so that the lug does not come off from the guide surface of the support plate. Can be reliably supported on the heat transfer portion side wall via the support lug.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a support lug 15 of the heat transfer tube 10 of the present invention.
0 is provided between the lower surface of the loop-shaped bent portion and the side wall 4 of the heat transfer portion. In FIGS. 1 to 3, portions denoted by the same reference numerals as those in FIG. 6 represent the same components.

A support plate 16 extending from the heat transfer tube 2 to the inside of the heat transfer portion 6 is welded to the inside of the heat transfer portion 6 of the heat transfer tube 2 forming the heat transfer portion side wall 4. It has an upper guide surface 16a located on the upper surface in the extending direction and a lower guide surface 16b located on the lower surface, and includes stopper portions 16c, 16c protruding above and below the inner front end portion.

A lug 17 is attached to the lower surface of the loop-shaped bent portion of the heat transfer tube 10 by welding. The lug 17 is shown in FIG.
As shown in the figure, a mounting portion 17a provided at a substantially central portion on the upper guide surface 16a of the support plate 16 in a direction intersecting the support plate 16, and the heat transfer tubes 1 from both ends of the mounting portion 17a.
0 side plate portions 17b, 17 extending in the direction of the loop-shaped bent portion
b, and has a substantially U-shaped planar shape, and a lower guide groove 18 which is slidably fitted to the upper guide surface 16a as shown in FIG. ing.

A strip-shaped detachment prevention plate 19 is fixed to the outside of the tip of the side plate portions 17b, 17b of the lug 17 so as to approach the lower guide surface 16b of the support plate 16 from below and surround the support plate 16. Lug 17 and slip-off prevention plate 19
Is configured so that the upper guide surface 16a and the lower guide surface 16b of the support plate 16 are wrapped by the guide groove 18 of the lug 17 guide plate and the lowermost portion of the disengagement prevention plate 19, respectively.

The operation of the embodiment of the present invention will be described below.

When the combustion gas heats the water in the heat transfer tube 10, the heat transfer tube 10 also expands due to thermal expansion, and the axial direction of the linear portion of the heat transfer tube 10 (X-axis direction in FIG. 2). When the lug 17 and the support plate 16 slide relative to each other in the direction in which the upper guide surface 16a extends, the elongation due to thermal expansion or the like is absorbed by the lug 17 and the support plate 16 in the horizontal direction (see FIG. In the width dimension of the guide groove 18, the lug 17 and the support plate 16
Are absorbed by relative sliding.

If the elongation due to thermal expansion or the like is large, the stopper portions 16c projecting upward and downward with respect to the axial direction (X-axis direction in FIG. 2) of the linear portion of the heat transfer tube 10.
In the horizontal direction (the Y-axis direction in FIG. 2) of the heat transfer portion side wall 4, the guide groove 18 is locked by the width end (the left and right end in FIG. 3). When elongation due to thermal expansion or the like (in the Z-axis direction in FIG. 1) occurs, it is locked by the detachment prevention plate 19.

Therefore, the lug 17 does not come off the support plate 16 and the weight of the heat transfer tube 10 can be reliably supported by the heat transfer portion side wall 4 by the support lug 15.

It should be noted that the embodiments of the present invention are not limited to only the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0026]

According to the support lug of the heat transfer tube of the present invention, the longitudinal expansion caused by the thermal expansion of the heat transfer tube is absorbed by the sliding of the support plate and the lug by the guide groove and the guide surface. If it is large, it is locked at the stopper and the width end of the guide groove, and the lift due to the thermal expansion of the heat transfer tube is held by the plate for preventing the support lug of the heat transfer tube from coming off. An excellent effect that the heat transfer tube does not come off from the guide surface and the weight of the heat transfer tube can be reliably supported on the heat transfer portion side wall via the support lug can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a support lug of a heat transfer tube of the present invention.

FIG. 2 is a view in the direction of arrows II-II in FIG.

FIG. 3 is a view in the direction of arrows III-III in FIG. 1;

FIG. 4 is a vertical sectional side view showing an outline of an example of a boiler.

FIG. 5 is a side view showing an example of a heat transfer tube and a support lug of a conventional heat transfer unit.

FIG. 6 is an enlarged perspective view showing an example of a support lug of the heat transfer tube of FIG.

[Explanation of symbols]

 Reference Signs List 4 Heat transfer section side wall 6 Heat transfer section 9 Heater 10 Heat transfer tube 15 Support lug 16 Support plate 16a Upper guide surface 16b Lower guide surface 16c Stopper portion 17 Lug 18 Guide groove 19 Separation prevention plate

Claims (1)

[Claims] 1. A heat transfer tube support lug for supporting a loop-shaped heat transfer tube on a heat transfer portion side wall, the guide lug extending from the heat transfer portion side wall to the inside of the heat transfer portion and provided on upper and lower sides. A support plate having a stopper portion protruding upward and downward from the inner front end portion, and a downward guide groove slidably fitted to the upper guide surface is provided on the lower surface, and the lower surface of the loop-shaped bent portion of the heat transfer tube is provided. A support lug for a heat transfer tube, comprising: a mounted lug; and a strip-shaped slip-off prevention plate mounted on the lug in proximity to the lower guide surface from below.