JP2002130608A - Structure for hang change of upper part of supporting tube of boiler header - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for hang change of the upper part of a supporting tube of a boiler header, in which a fiducial point for movement of a header supporting tube to the furnace wall of a boiler main body is defined, and a difference in movement between them is minimized, a constant hanger of a great-capacity and a support-tube stopper are eliminated, and structure simplification and cost-reduction can be attained. SOLUTION: The level of the upper hanging-change point P2 of a header- supporting tube 25 is allowed to agree substantially with the level of a hanging point P1 of the boiler main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for suspending an upper support pipe of a boiler.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional tower boiler.
A boiler main body 1 having a rectangular horizontal cross section, extending upward and having a ceiling wall 3 at an upper end, and suspending the boiler main body 1 from a frame 4 assembled with a steel frame such as a rigid hanger. It is suspended and supported by a material 5. The front, rear, left and right furnace walls 2 have a configuration in which parallel furnace wall tubes extending in the vertical direction are connected to each other by fins.

A plurality of burners 6 are provided at the lower part of the furnace wall 2 on the front and rear sides of the boiler main body 1, and an exhaust gas outlet 7 is provided at a rear end of an upper end of the boiler main body 1.
A flue 8 whose upper end communicates with the exhaust gas outlet 7 extends downward.

[0004] A heat exchange device 9 is provided between the upper and lower middle portions in the boiler main body 1 and the exhaust gas outlet 7.

The heat exchanger 9 is provided with a economizer 10 at the uppermost position (lower temperature side) near the exhaust gas outlet 7, and a lower temperature reheater is provided below the economizer 10. 11, low-temperature superheater 12, high-temperature reheater 13, high-temperature superheater 14,
And a hanger tube superheater 15 are sequentially arranged.

As shown in FIG. 2, each of the economizer 10, the low-temperature reheater 11, the low-temperature superheater 12, the high-temperature reheater 13, and the high-temperature superheater 14, as shown in FIG. Vertical panel-shaped loop pipe 1 extending over the entire width in the front-rear direction
6, a large number of panel-shaped loop tubes 16
Is the left-right direction of the boiler body 1 (the direction perpendicular to the paper surface of FIG. 2)
Have a number of juxtaposed arrangements.

[0007] The hanger tube superheater 15
The economizer 10, low-temperature reheater 11, low-temperature superheater 12, high-temperature reheater 13, and high-temperature superheat are provided by a large number of hanger tubes 18 extending downward from an upper pipe 17 provided at the upper end. Each loop tube 16 of the vessel 14 is suspended and supported, and the lower end thereof is bent laterally to constitute the hanger tube superheater 15.

The upper end of the furnace wall tube of each furnace wall 2 of the boiler body 1 has a steam-water separator 19 comprising a drum or a separator.
(The case of a drum is shown in FIG. 2), the heated water heated by the furnace wall tube is separated into water and steam, and the water is returned to the furnace wall tube of the boiler body 1 again. The steam separated by the steam separator 19 is guided to the upper pipe 17 of the hanger tube 18.

Therefore, in the example of the configuration shown in FIG. 2, the feed water 20 guided from below is first supplied to the economizer 10, and the burner 6
After the feedwater 20 is heated in the economizer 10 by the high-temperature exhaust gas 21 generated by the combustion of the boiler 1
Is supplied to the lower end of the boiler, rises while being heated in the furnace wall tubes of the furnace walls 2 at the front, rear, left and right of the boiler main body 1, and is supplied to the upper steam-water separator 19 to be separated into water and steam. It is returned to the furnace wall tube of the main body 1.

[0010] The steam separated by the steam separator 19 is supplied to the hanger tube 18 from the upper pipe 17, descends inside, is guided to the hanger tube superheater 15 and is superheated. The steam is then supplied to the high-temperature side superheater 14 where it is superheated and turned into high-temperature and high-pressure steam and supplied to the high-pressure steam turbine 22.

The steam leaving the high pressure steam turbine 22 is:
After being supplied to the low-temperature side reheater 11 and reheated, it is guided to the high-temperature side reheater 13 and further heated, and then supplied to the medium-pressure or low-pressure steam turbine 23. .

[0012]

By the way, a loop pipe of the economizer 10, the low-temperature reheater 11, the low-temperature superheater 12, the high-temperature reheater 13, and the high-temperature superheater 14 of the heat exchanger 9 is used. 16 are respectively connected to the inlet and outlet sides of the boiler 16, and each of the pipes 24 is disposed outside through the furnace wall 2 of the boiler main body 1. In order to support the boiler, conventionally, a pipe support pipe 25 is extended from the upper pipe support 17, and the pipe support pipe 25 is penetrated through the furnace wall 2 of the boiler main body 1 and taken out to the outside. The support beam 27 is attached to a required height position of the tube support tube 25, and a suspension member (shown in FIG. 1) is suspended from the support beam 27. ) To suspend the pipe 24.

The pipe supporting pipe 25 is made to have the same temperature as the furnace wall 2 of the boiler main body 1 as much as possible, and the difference in elongation due to the temperature difference between the pipe supporting pipe 25 and the furnace wall 2 of the boiler main body 1 is reduced. Although it is designed to be minimized, the level of the suspension point P1 of the boiler body 1 with respect to the suspension material
The level of the upper suspension point P2 by the suspension member 28 is considerably low, and a level difference H ′ occurs between the two. For example, when the level difference H ′ is about 7 [m]. Since the maximum displacement of the pipe-side supporting pipe 25 with respect to the furnace wall 2 of the boiler main body 1 is about 45 [mm], it is necessary to use a large-capacity constant hanger as the suspension member 28 of the pipe-side supporting pipe 25. At the same time, it is necessary to provide a support pipe stopper 29 having a truss structure for setting a base point of movement of the pipe-side support pipe 25 with respect to the furnace wall 2 of the boiler main body 1.

However, as described above, the skew supporting tube 2
5 uses a large-capacity constant hanger as the suspension member 28 and a support pipe stopper 2 for setting a base point of movement of the pipe-side support pipe 25 with respect to the furnace wall 2 of the boiler body 1.
The provision of 9 has a drawback that the structure is complicated and the cost is increased.

In view of such circumstances, the present invention can clarify the starting point of the movement of the pipe supporting pipe with respect to the furnace wall of the boiler main body, minimize the difference in movement between the two, and provide a large-capacity constant hanger. It is an object of the present invention to provide a boiler pipe supporting pipe upper suspension structure which can eliminate the need for a support pipe and a support pipe stopper, and can simplify the structure and reduce the cost.

[0016]

According to the present invention, a boiler main body is suspended from a frame at a hanging point thereof, and a brace supporting pipe for supporting a brace arranged outside the furnace wall of the boiler body is provided. A boiler pipe support pipe upper suspension structure that is suspended from the frame at the upper suspension point, wherein the level of the upper suspension point of the pipe support pipe substantially matches the level of the suspension point of the boiler body. The present invention relates to a structure for suspending an upper support pipe of a boiler.

According to the above means, the following effects can be obtained.

As described above, when the level of the upper suspension point of the pipe-side support pipe is made substantially equal to the level of the suspension point of the boiler body, there is almost no level difference between the two. It is not necessary to use a large-capacity constant hanger as a rigid hanger, and it is not necessary to provide a support pipe stopper for setting a base point of movement of the pipe-side support pipe with respect to the furnace wall of the boiler main body. Thus, the starting point of the movement of the pipe supporting pipe relative to the furnace wall becomes clear, the structure is simplified, and an increase in cost can be avoided.

[0019]

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

FIG. 1 shows an example of an embodiment of the present invention. In the figure, portions denoted by the same reference numerals as those in FIG. 2 represent the same components, and the basic configuration is the same as that of the conventional device shown in FIG. This embodiment is the same as the one shown in FIG. 1 except that the level of the upper suspension point P2 of the pipe-side support pipe 25 is made substantially equal to the level of the suspension point P1 of the boiler main body 1, as shown in FIG. It is in the point.

Next, the operation of the illustrated example will be described.

As described above, when the level of the upper suspension point P2 of the pipe-side support pipe 25 is made substantially equal to the level of the suspension point P1 of the boiler main body 1, the level difference H between the two is almost eliminated.
For example, when the level difference H is about 1 [m], the moving amount of the pipe supporting pipe 25 with respect to the furnace wall 2 of the boiler main body 1 is about 5 [mm] at the maximum. It is not necessary to use a large-capacity constant hanger as the suspension member 28 for the tube 25, and a rigid hanger can be used, and a truss for setting a base point of movement of the tube-side support tube 25 with respect to the furnace wall 2 of the boiler body 1 is provided. There is no need to provide the support pipe stopper 29 having a structure, and the starting point of the movement of the pipe-side support pipe 25 with respect to the furnace wall 2 of the boiler main body 1 becomes clear, thereby simplifying the structure and avoiding an increase in cost.

In this way, the starting point of the movement of the pipe-side support pipe 25 with respect to the furnace wall 2 of the boiler main body 1 can be clarified, and the difference in movement between the two can be minimized, and a large-capacity constant hanger or support pipe stopper 29 can be provided. Can be eliminated, and the structure can be simplified and the cost can be reduced.

Incidentally, the structure for suspending the upper part of the pipe supporting pipe of the boiler of the present invention is not limited to the above-mentioned illustrated example.
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0025]

As described above, according to the boiler pipe supporting pipe upper suspension structure of the present invention, the starting point of the movement of the pipe supporting pipe with respect to the furnace wall of the boiler body can be clarified, and between the two. The movement difference can be suppressed to a minimum, a large-capacity constant hanger or a support tube stopper can be eliminated, and an excellent effect that the structure can be simplified and the cost can be reduced can be achieved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an example of an embodiment of the present invention.

FIG. 2 is a side sectional view showing an example of a conventional tower boiler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Furnace wall 4 Frame 5 Suspension material 24 Portion 25 Portion support tube 28 Suspension material H Level difference P1 Suspension point P2 Upper suspension point

Claims (1)

[Claims] 1. A boiler main body is suspended from a frame at a suspension point thereof, and a pipe-side support pipe for supporting a pipe-side disposed outside the furnace wall of the boiler body is separated from the frame at an upper suspension point. What is claimed is: 1. A boiler pipe supporting pipe upper suspension structure for suspending a boiler, wherein the level of the upper suspension point of the pipe supporting pipe is substantially matched with the level of the suspension point of the boiler body. Suspended support pipe upper structure.