JPH04108110U - superheater - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent superheater tubes from bending. [Structure] Attach a sleeve 9 to the penetration part of the ceiling wall 2 and a sleeve 22 to the penetration part of the furnace bottom wall 3 of the superheater tube 7, whose lower end is connected to the inlet header 15 and whose upper end is connected to the outlet header 10, The superheater tube 7 is slidably fitted into the sleeves 9 and 22, and the portion of the superheater tube 7 protruding downward from the furnace bottom wall 3 and the inlet header 15 are connected to the inlet tube surround 26 provided with an expansion bellows 28. Since the portion of the superheater tube 7 that protrudes upward from the ceiling wall 2 and the outlet header 10 are surrounded by the outlet tube surround 11 provided with the expansion bellows 24, the superheater tube 7 and the furnace wall tube of the furnace wall Even if there is a difference in thermal expansion between the two, the thermal expansion of the superheater tube 7 is not restricted by the furnace wall tube, and therefore the superheater tube 7 does not curve in the radial direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a superheater in which a superheater tube is prevented from being bent.

0002

[Conventional technology]

An example of a boiler equipped with a radial secondary superheater is shown in Figs. 3 and 4, in which 1 is a vertical Furnace wall installed vertically; 2 is ceiling wall installed approximately horizontally on top of furnace wall 1; 3 is furnace wall 1 is a furnace bottom wall installed at an angle at the bottom, 4 is a plurality of bars arranged on the front and rear surfaces of the furnace wall 1. In the furnace 5 formed by the furnace wall 1, ceiling wall 2, and furnace bottom wall 3, there is a An injection-shaped secondary superheater (superheater) 6 is installed.

[0003] The secondary superheater 6 includes a plurality of superheater tubes 7 that are arranged at predetermined intervals in the left-right direction D ₁ and the front-back direction D ₂ of the boiler and extend vertically, and the upper part of the superheater tube 7 is , extends upwardly by slidably penetrating a sleeve 9 fixed between horizontally installed ceiling pipes 8, 8 constituting the ceiling wall 2, and has an upper end connected to an outlet horizontally arranged above the ceiling wall 2. It is connected to Kanyoye 10.

0004 The outlet header 10 is used to prevent gas in the furnace 5 from leaking through the sleeve 9. , is surrounded and fixed by a box-shaped outlet header 11, and the outlet header 10 is fixed on the top thereof. and the upper surface of the outlet pipe surround 11 connected to the bracket 12 with a pin. through a rod 13 extending upwardly through a spring hanger (not shown). It is suspended from a structure.

[0005] The lower part of the superheater tube 7 is a horizontally arranged furnace bottom tube 14, 1 which constitutes the furnace bottom wall 3. 4, the lower end of which is an inlet pipe extending downwardly through the furnace bottom wall 3. It is connected to the terminal 15.

[0006] A superheater tube surround is provided on the lower surface of the furnace bottom wall 3 so as to surround the penetration portion of the furnace bottom wall 3 of the superheater tube 7. 16 is attached, and the lower surface penetrating portion of the superheater tube surround 16 of the superheater tube 7 is connected to the superheater tube surround 16. Welded and fixed to.

[0007] In addition, in FIG. 3, 17 is a fin that connects adjacent ceiling pipes 8, and 18 is a fin that connects adjacent ceiling pipes 8. The fins 19 connect the furnace bottom pipes 14 to each other, and the outlet pipes 19 are located on the upper surface of the ceiling wall 2. The castables 20 housed in the enclosure 11 are heated so as to be located on the lower surface of the furnace bottom wall 3. Castables filled in the vessel enclosure 16, 21 are placed on the outlet pipe enclosure 11 of the superheater tube 7. It is an accordion-shaped expansion bellows provided in the surface penetrating part.

[0008] During boiler operation, the superheater tube 7 of the secondary superheater 6 is directly heated by the flame of the burner 4. receive heat. Further, the furnace wall tubes constituting the furnace wall 1 are water tubes, and the superheater tube 7 is a steam tube. Therefore, the thermal expansion of the superheater tube 7 is larger than that of the furnace wall tube. The lower part of the superheater tube enclosure 16 is welded and fixed to the lower surface of the superheater tube surround 16.

[0009] Therefore, even when the furnace wall tube extends downward due to thermal expansion, the superheater tube 7 cannot extend downward, and the difference in length between the superheater tube 7 and the furnace wall tube is the outlet tube. It is pulled upward by a spring hanger suspending it.

0010

[Problem that the idea aims to solve]

Therefore, as mentioned above, if there is a large difference in length between the superheater tube 7 and the furnace wall tube, the By increasing the amount of expansion and contraction of the pull hanger, the difference in expansion is absorbed by the spring hanger. However, if the amount of expansion and contraction of the spring hanger is increased, the superheater tube The lower surface penetration part of the superheater tube enclosure 16 in No. 7 is fixed by welding, so there is a large amount of damage to this part. There is a risk of generating large stress, so the amount of expansion and contraction of the spring hanger should be increased. It is not possible.

[0011] Therefore, in the conventional secondary superheater 6, the difference in length between the superheater tube 7 and the furnace wall tube is completely eliminated. is not absorbed, and therefore the superheater tube 7 has a curvature in the radial direction, which This is repeated every time the boiler is started and stopped, so if the boiler is used for a long time, the superheater tube 7 There is a problem that plastic deformation occurs in the curved shape and the curved shape remains.

0012 In view of the above-mentioned circumstances, the present invention provides a superheater in which the superheater tube does not curve. This was done with the purpose of doing so.

[0013]

[Means to solve the problem]

This invention extends vertically into the furnace formed by the furnace wall, ceiling wall, and furnace bottom wall. A plurality of superheater tubes are arranged, and the lower ends of the superheater tubes penetrate the furnace bottom wall and extend downward. It is connected to the inlet header located below the furnace bottom wall, and the upper end of the superheater tube passes through the ceiling wall. In a superheater connected to an outlet header extending upward and disposed above a ceiling wall, the above-mentioned Attach sleeves to the superheater tube penetrations on the bottom wall and ceiling wall, respectively, and attach the sleeves to the superheater tubes. It is slidably fitted into the sleeve.

[0014]

[Effect]

During operation, the superheater tube extends downward due to thermal expansion, but the superheater tube extends through the ceiling wall. Since the superheater tube slides inside the sleeve at the bottom wall penetration part and the furnace bottom wall penetration part, the superheater tube touches the furnace wall during thermal expansion. therefore, the superheater tubes undergo radial curvature. It never happens.

[0015]

【Example】

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

[0016] 1 and 2 show an embodiment of the present invention, and in this embodiment, a secondary superheater 6 is configured. The feature is the mechanism that absorbs the thermal expansion of the superheater tube 7.

[0017] That is, there is a slot in the superheater tube enclosure 16 attached to the superheater tube 7 penetration part of the furnace bottom wall 3. The tube 22 is fixed, and the portion of the superheater tube 7 that protrudes downward from the furnace bottom wall 3 is a sleeve. 22 and is slidably fitted.

[0018] In addition, the outlet pipe surround 11 is connected to a lower pipe surround 23 fixed to the upper surface of the ceiling wall 2 and the lower pipe surround 23 . An upper tube head connected to the enclosure 23 via an accordion-shaped expansion bellows 24. A enclosure 25 is provided to prevent gas from leaking from the furnace 5 through the sleeve 9 and , absorbs vertical displacement of the ceiling pipe 8 and the outlet pipe surround 11 themselves that constitute the ceiling wall 2. However, a large load is not applied to the expansion bellows 21. .

[0019] Furthermore, an inlet header 26 surrounding the inlet header 15 is attached to the lower surface of the furnace bottom wall 3. It is being The inlet pipe surround 26 is connected to an upper pipe surround 27 fixed to the lower surface of the furnace bottom wall 3. and is connected to the upper pipe enclosure 27 via an accordion-shaped expansion bellows 28. A lower pipe enclosure 29 is provided to prevent gas from leaking from the furnace 5 through the sleeve 22. At the same time, the upper and lower sides of the furnace bottom tube 14 and the inlet tube surrounding 26 that constitute the furnace bottom wall 3 are It is designed to absorb displacement in the direction.

[0020] In addition, the same reference numerals are given to the same parts as those shown in Fig. 3 and Fig. 4. .

[0021] During boiler operation, the superheater tube 7 of the secondary superheater 6 extends downward due to thermal expansion. . At this time, since the superheater tube 7 slides on the sleeves 9 and 22, it extends downward. There is no problem with that.

[0022] In addition, a furnace wall pipe on the furnace wall 1, a ceiling pipe 8 on the ceiling wall 2, a furnace bottom pipe 14 on the furnace bottom wall 3, and an inlet pipe The enclosure 26 and the outlet pipe enclosure 11 also extend in the vertical direction due to thermal expansion, but the ceiling tube 8 and the outlet pipe The extension of the enclosure 11 itself is absorbed by the expansion bellows 24, and the extension of the enclosure 11 itself is absorbed by the expansion bellows 24. 14 and the inlet pipe surround 26 itself is absorbed by the expansion bellows 28. It will be done.

[0023] As mentioned above, the superheater tube 7 of the secondary superheater 6 is regulated by the extension of the furnace wall tube, etc. of the furnace wall 1. Since the superheater tube 7 of the secondary superheater 6 and the furnace wall 1 can be extended without being Even if there is a difference in the length of the furnace wall tubes, the superheater tube 7 does not curve in the radial direction.

[0024] Note that the present invention is not limited to the above-mentioned embodiments, and there may be cases where the present invention deviates from the gist of the present invention. Of course, various changes can be made within the scope.

[0025]

[Effect of the idea]

The superheater of the present invention has the advantage that the superheater tube does not curve in the radial direction. It can have a great effect.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of a superheater of the present invention.

FIG. 2 is a sectional view schematically showing a boiler furnace section using the superheater of the present invention.

FIG. 3 is a front view of an example of a conventional superheater.

FIG. 4 is a cross-sectional view schematically showing a boiler furnace section using a conventional superheater.

[Explanation of symbols]

1 Furnace wall 2 Ceiling wall 3 Hearth bottom wall 5 Furnace 6 Secondary superheater (superheater) 7 Superheater tube 9 Sleeve 10 Exit pipe 15 Entrance gate 22 Sleeve

Claims (1)

[Scope of utility model registration request] Claim 1: A plurality of superheater tubes extending vertically are arranged in a furnace formed by a furnace wall, a ceiling wall, and a furnace bottom wall,
The lower end of the superheater tube passes through the furnace bottom wall, extends downward, and is connected to an inlet header disposed below the furnace bottom wall, and the upper end of the superheater tube penetrates the ceiling wall, extends upward, and connects to the inlet header disposed below the furnace bottom wall. In the superheater connected to the outlet header disposed above the wall, a sleeve is fixed to the superheater tube penetration portion of the furnace bottom wall and the ceiling wall, respectively, and the superheater tube is slidably fitted into the sleeve. A superheater characterized by: