JP3875933B2 - Boiler horizontal heat transfer tube support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a horizontal heat transfer tube of a boiler used for heat recovery in a coke dry fire extinguishing equipment (CDQ) or the like.
[0002]
[Prior art]
In the coke dry fire extinguishing equipment (CDQ), the red hot coke is charged into the pre-chamber of the CDQ main body and lowered into the cooling room, and the inert gas, which is the cooling gas supplied into the cooling room, is exchanged with red hot coke. A high-temperature inert gas from which heat has been recovered is introduced into the boiler for heat exchange, and is then pumped and circulated again to the cooling chamber with a circulation blower. Steam obtained by heat exchange in the boiler is sent to a generator and recovered as electric energy.
[0003]
Conventionally, as a structure for supporting a horizontal heat transfer tube of a superheater in a boiler, as shown in FIG. 5, all horizontal heat transfer tubes 13 are suspended via a saddle 10 on a suspension tube 6 suspended from the upper part of the boiler. Structures that are fixed by welding are known.
[0004]
As another structure, as described in Japanese Patent Application Laid-Open No. 2000-65309, a structure is known in which all horizontal heat transfer tubes are mounted on a support fitting attached to a suspension tube by welding.
[0005]
[Problems to be solved by the invention]
However, in the support structure shown in FIG. 5, all the horizontal heat transfer tubes are fixed to the suspension tubes via saddles, so that the thermal expansion in the tube axial direction of the horizontal heat transfer tubes and the boiler water in the horizontal heat transfer tubes Due to the temperature difference, there is a problem that not only a large thermal stress is generated in the saddle portion, but also a crack is generated in the welded portion or the horizontal heat transfer tube is deformed.
[0006]
Further, in the support structure described in Japanese Patent Application Laid-Open No. 2000-65309, the horizontal heat transfer tube is merely placed on the support fitting attached to the suspension tube and is not restrained at all. There is a problem that the overall structure of the superheater composed of a large number of horizontal heat transfer tubes becomes unstable.
[0007]
The problem to be solved by the present invention is to provide a support structure for a boiler horizontal heat transfer tube that can reduce the thermal stress to the support portion and obtain a structurally stable suspension structure.
[0008]
[Means for Solving the Problems]
In the boiler horizontal heat transfer tube support structure of the present invention, only the lowermost horizontal heat transfer tube of the primary superheater is fixed to the suspension tube by welding, for example, through a saddle, and the other secondary superheater and primary superheater are fixed. As for the horizontal heat transfer tube of the heat sink, the above-mentioned problem was solved by slidably holding it in the tube axis direction.
[0009]
That is, the horizontal heat transfer tube at the lowermost stage of the primary superheater is fixed to the suspension pipe, so that it is structurally stable because it is integrated with the suspension pipe, and the lowermost stage of the primary superheater is at a relatively low temperature. Since the temperature difference from the boiler water is also small, no large thermal stress is generated in the portion where the horizontal heat transfer tube is fixed to the suspension tube. In addition, since the secondary superheater and the horizontal heat transfer tube of the primary superheater that are at a high temperature are slidably sandwiched in the tube axis direction, the thermal expansion component is greatly slid by sliding in the tube axis direction. In addition, since the horizontal heat transfer tube can hardly move except in the tube axis direction, a stable suspension structure can be obtained without fear of vibration in a direction perpendicular to the tube axis.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to an example in which the support structure of a boiler horizontal heat transfer tube of the present invention is applied to a boiler of a coke dry fire extinguishing equipment (CDQ).
[0011]
FIG. 1 is an overall view showing a boiler of a coke dry fire extinguishing equipment (CDQ) to which a support structure for a horizontal heat transfer tube of the present invention is applied, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. -B arrow figure and FIG. 4 are a part arrow arrow views of FIG.
[0012]
The boiler shown in FIG. 1 introduces a high-temperature inert gas from a CDQ main body of a coke dry fire extinguishing equipment (CDQ) (not shown) from the upper part of the boiler main body 1, and discharges the inert gas after heat exchange from the lower part. It is. In the boiler main body 1, a secondary superheater 2, a primary superheater 3, an evaporator 4, and a economizer are disposed from the top in order to exchange heat with the high-temperature inert gas introduced from the upper part and collect steam. 5 are sequentially arranged. Further, a suspension pipe 6 is suspended from the upper part of the boiler body 1 to support the horizontal heat transfer pipe 11 of the secondary superheater 2 and the horizontal heat transfer pipe 12 of the primary superheater 3.
[0013]
As shown in FIG. 2, the lowermost horizontal heat transfer tube 12 of the primary superheater 3 is fixed to the suspension tube 6 via a saddle 10 by welding. Moreover, in order to support the horizontal heat transfer tubes 12 other than the lowermost horizontal heat transfer tube 12 of the primary superheater 3 and the horizontal heat transfer tubes 11 of the secondary superheater 2, the suspension tube 6 has a plurality of vertical directions. A support 9 is attached.
[0014]
2 and 4, the support 9 includes an upper trigger 7 and a lower trigger 8, and the horizontal heat transfer tube 11 or 12 is sandwiched from above and below by the upper trigger 7 and the lower trigger 8. As shown in FIG. 4, the clamping part 7a of the upper trigger 7 and the clamping part 8a of the lower trigger 8 have a curvature radius R (example) slightly larger than the radius of the horizontal heat transfer tube 11 or 12 (radius 17 mm in the example). The horizontal heat transfer tube 11 or 12 is sandwiched only by the upper end portion of the sandwiching portion 7a of the upper trigger 7 and the lower end portion of the sandwiching portion 8a of the lower trigger 8, and is supported by the suspension tube 6. ing. Therefore, the horizontal heat transfer tube 11 or 12 is restrained in the vertical direction and hardly moves in the horizontal direction, but can slide in the tube axis direction.
[0015]
In the above embodiment, the lowermost horizontal heat transfer tube 12 of the primary superheater 3 is fixed to the suspension tube 6 via the saddle 10, but may be directly fixed to the suspension tube 6. Further, the horizontal heat transfer tubes other than the lowermost horizontal heat transfer tube 12 of the primary superheater 3 are sandwiched up and down by the upper trigger 7 and the lower trigger 8, but may be sandwiched left and right.
[0016]
【The invention's effect】
In the boiler horizontal heat transfer tube support structure of the present invention, only the bottom horizontal heat transfer tube of the primary superheater is fixed to the suspension tube, and the other secondary superheaters and the horizontal heat transfer tubes of the primary superheater are Since it is supported by the suspended pipe so as to be slidable in the direction of the pipe axis, the thermal stress of the support part of the horizontal heat transfer pipe is reduced, the support part is not damaged and the horizontal heat transfer pipe is prevented from being deformed. Since the heat transfer tube hardly moves in the direction perpendicular to the tube axis, a stable suspension structure is obtained without fear of vibration in the same direction.
[Brief description of the drawings]
FIG. 1 is an overall view showing a boiler of a coke dry fire extinguishing equipment (CDQ) to which a support structure for a boiler horizontal heat transfer tube of the present invention is applied.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is a view taken along arrow BB in FIG. 2;
4 is a view taken in the direction of an arrow a in FIG. 2;
FIG. 5 is an explanatory view showing a support structure of a conventional boiler horizontal heat transfer tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Secondary superheater 3 Primary superheater 4 Evaporator 5 Saving economizer 6 Hanging pipe 7 Upper trigger 7a Holding part 8 Lower trigger 8a Holding part 9 Support tool 10 Saddle 11-13 Horizontal heat transfer pipe

Claims (1)

A high-temperature gas is introduced from the upper part, and a secondary superheater and a primary superheater are sequentially arranged from the upper part to recover the steam. In the support structure of the boiler horizontal heat transfer tube supported by the suspension tube suspended from
Only the lowermost horizontal heat transfer tube of the primary superheater is fixed to the suspension tube, and the other secondary superheater and the horizontal heat transfer tube of the primary superheater are slidably held in the tube axis direction. A boiler horizontal heat transfer tube support structure characterized by that.

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