JPH0723762B2 - Boiler support structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a boiler support structure in which a top support beam, a support steel frame and the like are used.

2. Description of the Related Art A conventional supporting structure such as a suspended single-body radiant pulverized coal-fired boiler in which a top support beam or a supporting steel frame is used is shown in FIG.

Under such circumstances, in the large boiler 1, at present, a membrane wall is adopted for the furnace wall 2 of the boiler, and the whole is constructed as a box-shaped structure. It has become the mainstream from various points.

As a main part that constitutes the inside of this boiler, there are a furnace 3, a steam drum 4, a superheater 5, a economizer 6, a combustion device 7, a hopper 8, and the like.

On the other hand, in this boiler, a top support beam 10 supported by the top of the boiler 1 by a supporting steel frame (column) 9 provided around the boiler 1 is provided. Then, the boiler 1 is attached via a large number of suspension bolts 11 attached to the top support beam.
Including the furnace wall 2 forming the main body, the furnace 3, the combustion device 7 and the hopper 8 arranged at the lower part of the furnace wall, the steam drum 4 arranged at the upper part of the furnace wall 2, the superheater 5, the economizer 6, etc. It has a structure that suspends and supports almost all major equipment.

Problems to be Solved by the Invention However, the conventional boiler support structure described above has the following problems.

The number of suspension bolts 11 attached to the top support beam 10 at the top of the boiler 1 and suspending and supporting almost all the main body of the boiler 1 and main components is one for each device, so the total number is Has become enormous.

Then, a seal for combustion gas or the like at the penetrating portion of the boiler ceiling housing 12 (see FIG. 6) provided between these hanging bolts 11 and each device, measures against leakage of water from the outside, and the hanging bolts 11 It was necessary to take measures against the thermal expansion of.

Further, a large number of top support beams 10 supporting these suspension bolts also need to be bridged to the support steel frame 9, and these support beams bear the weight (load) of the main constituent equipment. Bending occurred, and as a result, it was not possible to maintain a uniform hanging surface at the top hanging surface of the supporting steel frame 9. Therefore, the respective loads supported by the respective hanging bolts 11 become unbalanced, and spring hangers (not shown) are arranged at respective points, and after the assembling, the respective unbalances of the length of the hanging bolt 11 are unbalanced. The current situation is that corrections and adjustments such as balance adjustments must be made sufficiently.

Then, as described above, the suspension bolt 11 and the top support beam are
Both of them were large in quantity and were complicated in structure.
Moreover, in view of the structure of the hanging bolt 11 and the required height of the top support beam 10 side, the required total height of the supporting steel frame 9 should be further provided at a height of about 2 to 4 m from the ceiling housing 12 above the boiler 1. It was not very preferable not only from the point of view of strength but also from the point of view of economy because of the failure to do so.

Means for Solving Problems In order to solve such conventional problems, the present invention provides
A boiler in which a membrane wall is adopted for the furnace wall of the boiler to form a box-shaped structure as a whole, and an intermediate support beam is connected in a well shape around the middle part of the furnace wall, and the intermediate support beam is supported by a supporting steel frame. Is.

By such means, the load is transmitted by connecting the intermediate support beam in a well shape around the middle part of the furnace wall (membrane wall) of the boiler with a support metal, and further extending the well-shaped intermediate support beam. Since both ends of the boiler are supported by the supporting steel frames provided at this height position, the weight of the entire boiler can be supported.

Embodiment An embodiment according to the present invention will be described in detail below with reference to FIGS. In these figures, the same parts as those shown in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

Therefore, according to the present invention, the furnace wall 2, the furnace 3 and the peripheral wall as shown in FIG. 1 all have a membrane wall structure,
In the boiler 1 including the furnace side and the rear flue part 13 as a whole, which is formed as a box-shaped structure, an intermediate support beam 14 is provided around the middle part of the furnace wall 2 so that the furnace wall 2 is held by the well. They are connected to each other in a shape through a supporting metal member 16 which is attached to the furnace wall 2 in advance.

As shown in FIGS. 2 and 3, the intermediate support beams 14 are made of groove-shaped or I-shaped steel, and each of the intermediate support beams 14 is horizontal at the contact portion with the back face of the membrane wall of the furnace wall 2. Intermediate support beam 14 so that it can slide slightly in the direction
A plurality of pairs of support metal parts (slider joints) 16 are provided on the upper and lower flange parts 15 and held between them. Then, by sandwiching these supporting metal pieces, each intermediate supporting beam 14 is connected to the periphery of the furnace wall 2.

As shown in FIG. 4, a pair of opposing intermediate support beams 14 connected to each other around the furnace wall 2 and fixed by bolting, welding or the like (not shown) as described above are Both ends of the are extended outward from the furnace wall 2.
Further, as well shown in FIG. 5, both ends of the intermediate support beam 14 are supported by the lower flange portion 15 in the vicinity thereof and also by the foundation beam 17 which is horizontally arranged along the periphery of the furnace wall 2. Has been done.

Then, this foundation beam is used in place of the supporting steel frame 9 which is conventionally used and is composed of a long pillar, and is close to the height position of the end portion of the intermediate support beam 14, that is, precisely to the height position of the foundation beam 17,
The structure is supported by the supporting steel frame 9 whose length is about half that of the conventional one.

With the above configuration, the steam drum 4 and the superheater 5 arranged above the furnace wall 2 to which the intermediate support beam 14 is connected.
The load such as the economizer or the economizer 6 is applied to the intermediate support beam 14 via the membrane wall forming the furnace wall 2 which is box-shaped and has a high in-plane rigidity, while the furnace 3 and the combustion device arranged below the furnace wall The load of 7, the hopper 8 and the like is also applied to the intermediate support beam 14 while being suspended by the membrane wall of the peripheral wall 2. Then, the weight (load) applied to the entire boiler 1 is first borne (supported) by the membrane wall of the furnace wall 2 first, and then the intermediate support indirectly connected from the furnace wall 2 through the support metal 16 is carried out. The total load of these boilers 1 is transmitted to the beam 14, and the total load is surely released to the side of the supporting steel frame 9 supporting the intermediate support beam via the foundation beam 17, so that the ground 18 ( It is possible to disperse the entire load in (see FIG. 1).

Further, the supporting metal member 16 connecting the intermediate support beam 14 to the membrane wall of the furnace wall 2 supports the intermediate support beam,
Moreover, by making it slidable, the thermal stress due to the difference in thermal expansion and the delay in temperature difference occurring in the horizontal direction of the furnace wall can be relaxed.

Therefore, by adopting the support structure as described above, most of the conventional hanging bolts 11 that are installed on the top of the boiler 1 and are required in large numbers, and a top support beam that supports these bolts are provided.
All 10 (see Figure 6) can be eliminated.

As a result, it is possible to greatly improve the supporting structure of the main constituent devices, that is, the steam drum 4, the superheater 5, and the economizer 6, which are provided only by suspending the suspension bolt 11.

The newly improved support structure (see FIGS. 1 and 6) for each of these devices will be described below item by item.

(1) Steam Drum 4 Since the steam drum 4 is generally a cylindrical body, U bolts (not shown) are conventionally hung at two ends of the steam drum 4 to suspend and support the support steel frame 9. In this case, the steam drum 4 is transferred to the upper part of the furnace wall 2 and a saddle (not shown) is provided on the upper wall 19 of the furnace wall 2 such as the front wall and the side wall, and the steam drum 4 is installed and supported on the upper part thereof. Then, the membrane wall constituting the furnace wall 2 receives and supports the load.

(2) Superheater 5 Conventionally, the superheater 5 is supported by a large number of hanging bolts 11 through a crown seal (not shown) in the ceiling penetrating portion of the superheater tube or an upper tube header 19 and the like. However, in the case of the structure according to the present invention, particularly for the large boiler 1, a support beam (not shown) is provided inside the ceiling housing 12 and between the upper side wall headers 19 of the furnace wall 2. And the load of the superheater 5 is received from the ceiling crown seal via a small suspension rod (not shown), and the membrane wall constituting the furnace wall 2 is also subjected to the entire load via its support beam to support it. Will be done.

(3) About the economizer 6 The economizer 6 has two conventional support structures, one of which is to install a hanger tube (not shown) in this economizer tube group and extend it to the upper ceiling housing part 12. , From that part, it was suspended and supported by a supporting steel frame via a suspension bolt 11.

In this case, similarly to the configuration of the item (2), the supporting beam is passed between the upper pipe headers 19 of the furnace wall 2 to suspend the hanger tube of the economizer 6, and the side membrane of the furnace wall 2 is hung through the supporting beam. The entire load will be transmitted to the wall.

And the other one is that inside the furnace wall 2 that surrounds the economizer 6 as a flue 13, a support beam is passed between arbitrary opposing walls, and the economizer tube group 6 is placed on the support beam. Is placed or suspended and supported to transfer the load to the membrane wall of the furnace wall 2. Even in the case of the structure according to the present invention, there is no particular need to change the structure, and a conventional structure may be used. .

EFFECTS OF THE INVENTION As described above in detail, according to the present invention, by adopting the support structure with the well-shaped intermediate support beam in the intermediate portion of the boiler main body, a large number of boiler ceiling portions required in the conventional structure are provided. The suspension device and the top support beam are not required, so that the complicated structure and the economical efficiency can be surely improved.

Not only that, by utilizing the membrane wall rigidity of the boiler furnace wall to support the boiler, a supporting structure in the middle part of the boiler becomes possible, and therefore the required height of the boiler supporting steel frame can be halved, which is economically feasible. A huge cost reduction can be achieved.

Further, such a support structure can be a structure that is considerably advantageous in terms of required strength due to its vibration mechanism, increased rigidity, and the like in terms of seismic design.

[Brief description of drawings]

FIG. 1 is a schematic assembly sectional view showing an example of a boiler support structure according to the present invention, FIG. 2 is a view showing a connecting portion of an intermediate support beam to a furnace wall, and FIG. 3 is a line III-III in FIG. A transverse cross-sectional view, FIG. 4 is a view showing a state where the intermediate support beam is connected to the furnace wall in a well shape, and FIG. 5 is a view showing an arrangement of a support metal and a foundation beam supporting the intermediate support beam, FIG. 6 is a schematic assembly sectional view showing a conventional boiler support structure. 1 ... Boiler, 2 ... Furnace wall (membrane wall), 9
…… Supporting steel frame, 14 …… Intermediate supporting beam.

Claims (1)

[Claims] Claim: What is claimed is: 1. In a boiler in which a membrane wall is used for the furnace wall of the boiler and the whole is constructed as a box-shaped structure, an intermediate support beam is connected in a well shape around the middle part of the furnace wall, and the intermediate support beam is further supported. A boiler support structure characterized by being supported by a steel frame.