JP2002340305A - Supporting structure for boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting structure of an air casing for a boiler capable of reasonably following the thermal expansion of the boiler without accompanying any big change in the supporting structure of the air casing itself, or without using a part of high unit price. SOLUTION: One end of a lifting beam 6 for suspending the air casing 1 is attached to the mounting part of a lifting fitting 10 attached to the upper wall 4 through an adjustable lifting fitting 7, while the other end of the same is attached to one part of a boiler structure installed at a horizontal position different from that of a furnace or a casing 9 for transferring a load to the heat transfer wall 8 of a rear heat transferring unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler support structure, and comprises a boiler supporting steel frame suspended from a ceiling beam, comprising an upper wall having a vertical tube at an upper portion and a lower wall having an inclined tube at a lower portion. The present invention relates to a boiler furnace wind box support structure including a boiler furnace and a rear heat transfer wall provided at a different horizontal position from the furnace.

[0002]

2. Description of the Related Art A boiler provided with a burner in a furnace for burning fuel supplied from the outside is provided with a wind box for supplying air for burning fuel to the burner. A heat transfer wall formed of a heat transfer tube that absorbs radiant heat generated in the furnace when the fuel injected from the burner burns and converts feedwater flowing through the tube into steam is provided on the outer periphery of the furnace. . In such a boiler having a lower wall made of an inclined tube below the furnace heat transfer wall, it is difficult to load the weight of the wind box on the lower wall because of the problem of mechanical strength of the lower wall. Such a wind box support form has been adopted.

That is, a supporting box is housed, and a wind box whose installation position moves downward according to the amount of thermal expansion of the upper wall during operation of the boiler is supported by a hanging metal such as a vertical hanging plate. The load of the wind box is applied to the upper part of the lower wall corresponding to each of a number of inclined pipes constituting the lower wall, that is, the upper part consisting of a vertical pipe extending in the vertical direction with the same fluid path. It is transmitted to the wall, and the wind box is supported by the upper wall, and a suspension beam whose one end is supported by the suspension metal is provided, and the suspension is supported by an elastic suspender (constant hanger) or the like which is supported by elastic expansion and contraction such as a spring. Suspend the other end to the nearest boiler support steel frame. Both ends of the suspension beam are supported by the upper wall and the boiler supporting steel frame.

[0004]

In the above-mentioned prior art, in the support mode in which the wind box is supported via the upper wall, it is necessary to avoid applying the full load of the wind box to the mounting portion of the hanging bracket on the upper wall. In addition, it is necessary to support the supporting steel frame by the suspension beam. In addition, in a support mode in which a part of the load of the wind box is suspended from the nearest boiler steel frame, since the amount of thermal expansion and contraction of the boiler steel frame can be regarded as zero, the installation position is determined according to the amount of thermal expansion of the upper wall. The spring of the adjustable hanging device that supports the wind box that moves downward and that is supported by elastic expansion and contraction of springs, etc. I do.

[0005] Fig. 3 is a schematic diagram showing the overall configuration of a boiler employing a conventional wind box support mode. A boiler steel frame 2 in the form of a girder is assembled vertically and horizontally so as to surround the outer periphery of the boiler. The plurality of sub-ceiling beams 21 assembled form a ceiling frame. A header called a header 40 has a sling rod (suspension member) 5 having one end attached to a plurality of locations on the upper surface, and the other end of the sling rod (suspension member) 5
It is suspended from the ceiling frame by being tightened with nuts.

An upper wall 4 composed of a number of vertical tubes is connected to the header 40 and extends downward, and a lower wall 3 composed of a number of inclined tubes extending obliquely from these upper walls 4.
Is connected. A rear heat transfer section heat transfer wall (also referred to as a cage wall) 8 formed of a vertical tube is also formed in a portion where the inverted combustion gas flows downward (hereinafter referred to as a rear heat transfer section) on the ceiling of the furnace. Have been. The lower part of the rear heat transfer section heat transfer wall 8 is covered with a casing 9.

FIG. 4 is an enlarged view of the wind box of the boiler shown in FIG. As shown in FIG. 1, the wind box 1 is suspended by a suspension beam 6 and a suspension fitting 10, and the suspension beam 6 is a suspension fitting (an auxiliary suspension plate or a vertical strap) having one end attached to the upper wall 4. ), The other end of which is attached to an adjustment hanger (constant hanger) 7. The adjusting suspender 7 is attached to the boiler supporting steel frame 2 near the lower wall 3. A support post 12 is incorporated in the interior of the wind box 1.
2 is provided with a plurality of burners 11 penetrating the wind box 1. When the lower wall 3 and the upper wall 4 elongate due to thermal expansion, the relative movement of the hanging fitting 10 corresponding to the upper wall 4 is adjusted.
The spring is designed to absorb. With respect to the relative movement of the burner 11 fixed to the lower wall 3 due to the extension of the lower wall 3, the burner penetrating portion of the support post has a slide and seal structure with respect to the movement amount, though not shown.

If the extension of the spring for absorbing thermal expansion and contraction is not so large, a general-purpose product can be used as the adjusting hanging member 7, so that the equipment cost is not very large. If the amount of extension of the spring of the fixture 7 exceeds a predetermined amount, a general-purpose product cannot be used for the adjustment hanging fixture 7, and it becomes a custom-ordered product, resulting in high equipment costs. In the conventional manner of supporting the wind box 1, the difference in thermal expansion between the boiler supporting steel frame 2 and the upper wall 4 is large,
The extension amount of the spring of the adjustment hanging member 7 exceeds a predetermined amount,
Therefore, there has been a problem that the equipment cost is high.

SUMMARY OF THE INVENTION The present invention has been made to overcome such problems in the prior art, and requires a large change in the support structure of the wind box itself and the thermal expansion and contraction of the boiler without using expensive parts. It is an object of the present invention to provide a boiler wind box support structure that can easily follow the above.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a furnace heat transfer wall comprising a lower wall composed of a number of inclined tubes extending obliquely, and an inclined tube above the lower wall. Consists of an upper wall made up of a number of vertical tubes extending in the vertical direction with the same circulation route, and a burner and a wind box for supplying combustion air to the burner are provided on the lower wall. The rear heat transfer wall consists of a number of vertical tubes extending vertically at different horizontal positions from the upper wall, and the wind box is connected to the upper wall and the rear heat transfer wall. For example, the wind box is locked to the upper wall and the casing that transmits the load to the rear heat transfer section heat transfer wall, or the wind box is locked to the upper wall via the hanging metal fitting, Providing suspension beams,
One end of the suspension beam is supported by a suspension fitting, and the other end of the suspension beam is engaged with a rear heat transfer unit heat transfer wall or a casing that transmits a load to the rear heat transfer unit heat transfer wall. One is performed via an elastically stretchable support.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an enlarged view of a wind box section of a boiler according to an embodiment of the present invention. In the figure, the same reference numerals are given to portions that are the same as or can be regarded as the same as those in the conventional example, and redundant description is omitted. In the present embodiment, one end of the suspension beam 6 for suspending the wind box 1 is on the adjustment hanging device 7 attached to the mounting portion of the vertical suspension plate 10, and the other end is in a horizontal position different from the lower wall 3 and the upper wall 4. It is attached to a casing 9 that transmits a load to a rear heat transfer section heat transfer wall 8 which is a furnace structure to be installed.

As described above, in this embodiment, both ends of the suspension beam 6 are supported because the vertical suspension plate 10 attached to the upper wall 4 is suspended from the ceiling at a different horizontal position from the furnace. Since the casing 9 transmits the load to the rear heat transfer section heat transfer wall 8 that is provided, the two heat expand and contract in the vertical direction with the operation of the boiler, so that the elongation is regarded as zero as in the related art. Compared with the case where the boiler is supported by the boiler supporting steel frame 2, the amount of extension of the spring of the adjusting hanging member 7 during thermal expansion and contraction of the furnace can be reduced. Therefore, a general-purpose product can be used for the adjustment hanging device 7 that is frequently used, and the cost of the boiler equipment can be considerably reduced while maintaining the mechanical strength of the entire equipment.

FIG. 2 is an enlarged view of a wind box of a boiler according to another embodiment of the present invention. Although the basic configuration of this embodiment is not different from that of the previous embodiment, the supporting form of the suspension beam 6 is slightly different. That is, in this embodiment, one end of the suspension beam 6 is attached to the suspension fitting 10, and the other end is attached to the adjusting suspension 7 supported by the casing 9. This embodiment also has the same effect as the previous embodiment. In the above two embodiments, the casing is provided on the casing 9 provided below the rear heat transfer section heat transfer wall 8.
When the rear heat transfer section heat transfer wall 8 is at a height close to the wind box 1, it can be directly supported by the rear heat transfer section heat transfer wall 8. In the case where the height of the rear heat transfer section heat transfer wall 8 is high and the heat transfer wall 8 is away from the wind box 1, it is necessary to install the vertical suspension plate 10 and the like.

[0014]

As described above, according to the present invention, since the upper wall and the rear heat transfer section are engaged with the heat transfer wall, the overall structure of the boiler facility can be achieved without a significant change in the support structure of the wind box itself. While maintaining the mechanical strength, it is possible to support the wind box following the thermal expansion and contraction of the boiler without applying a large load of the wind box to the upper wall while suppressing the equipment cost.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a wind box section of a boiler according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a wind box of a boiler according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing the entire configuration of a conventional boiler.

FIG. 4 is an enlarged view of a wind box portion of the boiler shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wind box 2 Boiler support steel 3 Lower wall 4 Upper wall 5 Sling rod 6 Suspension beam 7 Adjusting hanger (constant hanger) 8 Rear heat transfer part heat transfer wall 9 Casing 10 Hanging bracket, vertical hanger (vertical strap) 11 Burner 12 Support post 20 Ceiling beam 21 Secondary ceiling beam 40 Header

Claims (3)

[Claims] A furnace heat transfer wall comprising a number of heat transfer tubes through which a fluid to be heated such as water flows is provided around the inside thereof, and a burner provided on the furnace heat transfer wall burns fuel inside the furnace. A furnace for generating a high-temperature combustion gas as a heating fluid and performing heat exchange with the furnace heat transfer wall; provided with the furnace outlet connected to the furnace outlet; A rear heat transfer section heat transfer wall composed of a large number of heat transfer tubes circulating is provided in the periphery, and the exhaust gas having a relatively reduced temperature from the furnace outlet flows and exchanges heat with the rear heat transfer section heat transfer wall. In a boiler support structure for suspending and supporting a flue from a ceiling beam of a boiler-supporting steel frame, the furnace heat transfer wall includes a lower wall formed of a number of inclined tubes extending in an oblique direction, and a lower wall of the lower wall. The inclined pipe extends vertically in the same direction as the inclined pipe. An upper wall composed of a number of vertical tubes, wherein the lower wall is provided with the burner, and a wind box for supplying combustion air to the burner; Is composed of a number of vertical tubes vertically extending at different horizontal positions from the upper wall, and further, the wind box is locked to the upper wall and the rear heat transfer section heat transfer wall. Boiler support structure. 2. The boiler support structure according to claim 1, wherein said wind box is locked to said upper wall and a casing for transmitting a load to said rear heat transfer section heat transfer wall. 3. The wind box is locked to the upper wall via a hanging metal, a suspension beam is provided, and one end of the suspension beam is supported by the suspension metal. An end is locked to the rear heat transfer section heat transfer wall or a casing that transmits a load to the rear heat transfer section heat transfer wall, and one of the supports is performed via an elastically expandable and contractible support. The boiler support structure according to claim 1 or 2, wherein: