JP5611678B2 - Boiler equipment - Google Patents

Description

  The present invention relates to a boiler apparatus for a thermal power plant and the like, in particular, a furnace composed of an upper wall made of a vertical pipe and a lower wall made of an inclined pipe, and provided in a horizontal position different from that furnace (in parallel). The present invention relates to a support structure for a wind box of a boiler device having a rear heat transfer wall.

FIG. 5 is a schematic configuration diagram of a boiler apparatus for a thermal power plant.
As shown in the figure, this type of boiler apparatus is provided with a furnace 19 defined by an upper wall 1 made of a vertical pipe and a lower wall 2 made of an inclined pipe, and at a different horizontal position from the furnace 19. The rear heat transfer wall 3 (in parallel) and the flue casing 4 provided at the lower part of the rear heat transfer wall 3 are mainly configured.

  A wind box 5 is installed outside the lower wall 2, and combustion air is introduced into the furnace 19 through the wind box 5. Although not shown in FIG. 5, a number of burners are supported on the wind box 5 in a plurality of stages.

FIG. 6 is an explanatory view showing a support structure of the wind box 5 in the conventional boiler device.
As shown in the figure, the wind box 5 is mainly composed of a wind box casing 6, a backstay 7, and a support post 8. The load of the wind box 5 including the load of the burner 9 is transmitted to the upper part by the support post 8 and the suspension bolt 10.

  The load transmitted to the upper part of the wind box 5 is partly transmitted to the suspension fitting 12 called a vertical strap by the suspending beam 11 and further passed through the upper wall 1 (see FIG. 5) to the steel frame above the boiler. It is supported by.

  The remaining load is supported by the intermediate level steel frame 14 via the constant hanger 13. The intermediate-level steel frame 14 has a large load on the wind box 5 and a long distance between columns supporting both ends of the steel frame 14, so the size of the member is increased and the truss structure 15 is adopted. Therefore, it has a large-scale structure.

  Since the boiler apparatus is thermally extended downward during operation as a boiler upper reference, a constant hanger 13 is used at a portion for transmitting the load of the wind box 5 to the intermediate-level steel frame 14. The constant hanger 13 is a device that absorbs the thermal elongation during boiler operation and supports the load, and the bunker capacity increases as the amount of thermal elongation to be absorbed increases.

  The conventional support structure of the wind box 5 needs to absorb a large amount of thermal elongation generated in the section from the upper part of the boiler to the upper end of the wind box 5, and therefore uses a large capacity constant hanger 13.

  Japanese Patent No. 4410433 (JP 2002-340305 A) “Boiler support structure” is provided with a suspension beam, and one end of the suspension beam is connected to the upper wall via a constant hanger and a suspension fitting. And the structure which connects the other end of a suspension beam to a rear part heat-transfer wall, and transmits a load is proposed.

  With this proposal, the truss structure 15 shown in FIG. 6 can be omitted, and the amount of thermal elongation absorbed by the constant hanger 13 can be reduced.

Japanese Patent No. 4410433

  However, the “boiler support structure” proposed in Japanese Patent No. 4410433 is not without problems. That is, when a load is transmitted to the rear heat transfer wall 3, if the load is transmitted to a position away from the center of the rear heat transfer wall 3 in the horizontal direction, a moment acts and a problem arises in terms of strength.

  An object of the present invention is to provide a boiler device that can eliminate such drawbacks of the prior art and stably support the load of a wind box including a burner.

In order to achieve the above object, the present invention provides:
A furnace in which a wind box supporting a number of burners is attached to the outer periphery;
A rear heat transfer wall connected to the furnace outlet and juxtaposed with the furnace;
The boiler device is provided with a flue casing connected to the lower part of the rear heat transfer wall.

And the first means of the present invention is:
A suspension beam extending in the horizontal direction is arranged above the wind box,
The longitudinal intermediate portion of the suspension beam and the upper portion of the window box are connected by a casing suspension member such as a suspension bolt described later,
The furnace side end of the suspension beam is connected to the furnace,
The end of the suspension beam opposite to the furnace is connected to the lower header of the rear heat transfer wall,
The load of the wind box including the burner is configured to be distributed and transmitted to the furnace and the rear heat transfer wall via the suspension beam ,
Attach the upper end of the header lifting member to the furnace side of the lower header of the rear heat transfer wall,
The upper end portion of the flue casing is attached to the opposite side of the header side suspension member from the center of the lower header of the rear heat transfer wall .

  The present invention is configured as described above, and can provide a boiler device that can stably support the load of a wind box including a burner.

It is explanatory drawing which shows the support structure of the wind box which concerns on the 1st Embodiment of this invention. FIG. 1 is an enlarged view of a part X. It is explanatory drawing which shows the support structure of the wind box which concerns on the 2nd Embodiment of this invention. FIG. 3 is an enlarged view of a Y part. It is a schematic block diagram of the boiler apparatus for thermal power plants. It is explanatory drawing which shows the support structure of the wind box in the conventional boiler apparatus.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an explanatory view showing a support structure of a wind box according to the first embodiment of the present invention, and FIG. 2 is an enlarged view of a portion X in FIG.

  Since the schematic configuration of the entire boiler apparatus is the same as that shown in FIG. 5, description thereof will be omitted. The wind box 5 is mainly composed of a wind box casing 6, a backstay 7, and a support post 8 as in the conventional case. The load of the wind box 5 including the load of the burner 9 is transmitted to the upper part by the support post 8 and the suspension bolt 10.

  The upper end portion of the suspension bolt 10 is connected to an intermediate portion of the suspension beam 11 installed in a horizontal state. A furnace side end portion (left end portion in FIG. 1) of the suspension beam 11 is connected to the suspension fitting 12 via a constant hanger 13. Therefore, the load at one end of the suspension beam 11 is transmitted to the upper wall 1 (see FIG. 5) via the constant hanger 13 and the suspension fitting 12.

  As shown in FIG. 2, a suspension bolt 18 is suspended below the lower header 16 of the rear heat transfer wall 3 (see FIG. 5) provided in a horizontal position different from that of the furnace 19 (see FIG. 5). The first connection fitting 17 is attached. The end of the suspension beam 11 opposite to the furnace (the right end in FIGS. 1 and 2) is connected to the suspension bolt 18 via a second connection fitting 20.

  Therefore, the load on the end of the suspension beam 11 opposite to the furnace (the right end in FIGS. 1 and 2) is applied to the lower pipe via the second connection fitting 20, the suspension bolt 18 and the first connection fitting 17. It is structured to be transmitted to the central portion of the gather 16 (rear heat transfer wall 3).

  Thus, in this embodiment, since a load acts vertically downward at the center of the rear heat transfer wall 3, the rear heat transfer wall can be generated without generating a moment as in the conventionally proposed boiler support structure. The load can be transmitted to 3.

  In addition, as shown in FIG. 2, the flue casing 4 (refer FIG. 5) provided in the lower part of the rear part heat transfer wall 3 attaches the 1st connection metal fitting 17, the suspension bolt 18, and the 2nd connection metal fitting 20. As shown in FIG. Only the limited range is recessed on the side opposite to the suspension beam 11 so that the first connection fitting 17 or the like can be attached without making a hole in the flue casing 4 forming the passage of the combustion exhaust gas. it can.

(Second Embodiment)
FIG. 3 is an explanatory view showing a support structure of a wind box according to the second embodiment of the present invention, and FIG. 4 is an enlarged view of the Y part of FIG.

  In the present embodiment, the difference from the first embodiment is that, in the first embodiment, the first connection fitting 17 extending straight downward is used as shown in FIG. As shown in FIG. 4, a first connection fitting 17 having a substantially “<”-shaped side surface with an intermediate portion bent toward the suspension beam 11 side is used.

  The upper end portion of the first connecting bracket 17 is attached not to the position directly below the lower header 16 but to a position close to the furnace 19 side of the lower header 16, and the first connecting bracket 17 extends from the center of the lower header 16. 17 is that the flue casing 4 is attached to a position shifted in the horizontal direction on the opposite side.

The lower header 16 is arranged so that the bending moment generated from the suspension bolt 18 and the bending moment generated from the flue casing 4 cancel each other according to the ratio of the load transmitted through the suspension bolt 18 and the load of the flue casing 4. By determining how many mm away from the center, the load can be transmitted to the rear heat transfer wall 3 without generating a bending moment in total.
Further, in this support structure, it is not necessary to partially dent the flue casing 4 as shown in FIG. 2, and the casing structure can be simplified.

In the present invention , a suspension beam extending in the horizontal direction is disposed above the flue casing, a longitudinal intermediate portion of the suspension beam and an upper portion of the flue casing are connected by a casing suspension member, and the suspension beam The end of the furnace side is connected to the furnace, the end of the suspension beam opposite to the furnace is connected to the lower header of the rear heat transfer wall, and the load of the wind box including the burner is It is configured to be distributed and transmitted to the furnace and the rear heat transfer wall via a replacement beam.

  Because the rear heat transfer wall has high mechanical strength, even if a part of the load of the wind box including the burner is loaded on the rear heat transfer wall, it can withstand it sufficiently. There is no need for special reinforcement.

  In addition, since the lower header of the rear heat transfer wall has high mechanical strength and cross-sectional performance, there is a feature that it is not necessary to give special considerations such as reinforcement and load distribution in the load transmission portion.

Further, the present invention attaches the upper end portion of the header side suspension member to the furnace side from the center of the lower header of the rear heat transfer wall, and the header side suspension member from the center of the lower header of the rear heat transfer wall Is characterized in that the upper end of the flue casing is attached to the opposite side.

  In this way, the load of the wind box and the load of the flue casing can be balanced with respect to the lower header of the rear heat transfer wall, and no bending moment is generated. The header does not deform. In addition, the structure of the flue casing is simplified.

1 ... upper wall,
2 ... lower wall,
3 ... rear heat transfer wall,
4 ... Flue casing,
5 ... Wind box,
6 ... Wind box casing,
7 ... Backstay,
8 ... Support post,
9 ... Burner,
10 ... hanging bolt,
11 ... hanging beam,
12 ... Hanging bracket,
16: Lower header,
17 ... 1st connection metal fitting,
18 ... hanging bolt,
19 ... Furnace,
20 ... 2nd connection metal fitting.

Claims (1)

A furnace in which a wind box supporting a number of burners is attached to the outer periphery;
A rear heat transfer wall connected to the furnace outlet and juxtaposed with the furnace;
In the boiler device with a flue casing connected to the lower part of the rear heat transfer wall,
A suspension beam extending in the horizontal direction is arranged above the wind box,
The longitudinal intermediate portion of the suspension beam and the upper part of the wind box are connected by a casing suspension member,
The furnace side end of the suspension beam is connected to the furnace,
The end of the suspension beam opposite to the furnace is connected to the lower header of the rear heat transfer wall,
The load of the wind box including the burner is configured to be distributed and transmitted to the furnace and the rear heat transfer wall via the suspension beam ,
Attach the upper end of the header lifting member to the furnace side of the lower header of the rear heat transfer wall,
The boiler apparatus characterized by attaching the upper end part of the said flue casing to the opposite side to the said header side suspension member rather than the center of the lower header of the said rear part heat transfer wall .

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