JPH0113203Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a hanging device for a boiler tube of a waste heat boiler.

In recent years, the cement industry and other industries have tended to install boilers that recover waste gas heat in order to promote energy savings, but the waste gas contains a large amount of fine ducts, which adhere to the boiler tube and reduce performance. Therefore, I try to remove the dust by hitting the boiler tube. Figures 1 and 2 show a conventional waste heat boiler, where 1 indicates a hammering point;
2 is the boiler tube, 3 is the connecting rod, 4 is the hanging material,
5 is a support frame, and 6 is a header. Further, FIGS. 3 and 4 show details of the hanging device for the boiler tube 2, in which the hanging member 4 and the boiler tube 2 are connected via a steel rod 7 and welded metal. In this boiler tube hanging device, the impact force applied to the hammering point 1 for removing dust is applied to the connecting rod 3, the hanging material 4, the welded metal and the steel rod 7.
The dust that has adhered to the boiler tubes 2 is removed by being transmitted to each boiler tube 2 via.

In the above-mentioned hanging device for a boiler tube of a waste heat boiler, a steel rod 7 of an appropriate size, for example, about 9 mmφ, is used to connect the boiler tube 2 and the hanging material 4 to prevent excessive weld metal from being deposited. They are welded together, but as mentioned above, the weld is a propagation path for impact force for removing dust, and generally large stress is generated at point A or point B. This stress is a vibrational stress that is generated due to impact every few seconds or minutes, and is applied repeatedly about 10 ⁶ times a year, so there is an extremely high risk of fatigue failure. In particular, if such fatigue failure occurs on the boiler tube 2 side, leakage trouble will cause the operation to stop. Moreover, each panel of the boiler tube 2 is arranged at narrow intervals of about 100 mm, making repair work difficult.

This proposal addresses the above-mentioned problems, and is a waste heat boiler equipped with a suspension member that suspends and supports the boiler tube and transmits impact force to the boiler tube to remove dust attached to the boiler tube. In the boiler tube hanging device, a splittable sleeve is fitted over the boiler tube so that the entire inner and outer peripheral surfaces of the sleeve are in contact with each other, and only the joining ends of the sleeve are welded to integrate the sleeve. A hanging device for a boiler tube of a waste heat boiler is characterized in that the hanging material and the hanging material are fixed by welding. An object of the present invention is to provide an improved hanging device for a boiler tube of a waste heat boiler that can prevent fatigue failure as much as possible.

Next, the suspension device for the boiler tube of the waste heat boiler of the present invention will be explained with reference to an embodiment shown in Figs. It's structured. When attaching the sleeve 8 to the boiler tube 2, both end faces of the half-split portion are welded to fit the sleeve 8 into the boiler tube 2, and no dents are created due to the welding to the boiler tube 2. This prevents welds, which tend to be weak points in terms of strength, from remaining in the structurally important boiler tube 2, thereby increasing the allowable stress of the boiler tube 2 from 2 to 2.
It can be made three times more expensive. Further, the hanging material 4 is bent so as to hold the sleeve 8, and is circumferentially welded to the sleeve 8 on both sides of the hanging material 4. By performing circumferential welding in this manner, the impact force transmitted from the hanging member 4 to the boiler tube 2 via the sleeve 8 can be dispersed, unlike when only the steel rod 7 is used as shown in Figs. Alternatively, it is effective for stress relaxation at point B.

In addition, FIGS. 7 and 8 show a backing plate 9 parallel to the hanging material 4.
In another embodiment, the abutment plate 9 is also welded to the sleeve 8, and depending on the nature of the dust, a greater striking force may be required to remove it.
The present embodiment is further effective for stress relaxation at points A and B and for increasing the vibration effect for dust removal.

In the boiler tube hanging device of the present waste heat boiler, as described above, the boiler tube 2 is fitted with a sleeve 8 that can be divided into two parts, and the entire inner and outer circumferential surfaces of the sleeve 8 are brought into contact with each other, and only the joint ends of the sleeve 8 are brought into contact with each other. Weld the
By integrating the sleeve 8, we have avoided leaving any welded parts in the boiler tube 2 that are likely to be weak points in terms of strength (we have avoided welding the sleeve 8 to the boiler tube 2), so the allowable stress of the boiler tube 2 is can be increased. In addition, a sleeve 8 that can be divided is fitted onto the boiler tube 2 so that the entire inner and outer peripheral surfaces thereof are in contact with each other, and only the joint ends of the sleeve 8 are welded to integrate the sleeve 8,
Since the sleeve 8 and the hanging material 4 are fixed by welding, the impact force transmitted from the hanging material 4 to the boiler tube 2 via the sleeve 8 can be dispersed over the entire contact surface between the sleeve 8 and the boiler tube 2. This has the effect of preventing as much as possible fatigue failure that would otherwise occur in the connection between the boiler tube 2 and the hanging member 4 or in the vicinity thereof.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional waste heat boiler, Figure 2 is a front view of a conventional waste heat boiler;
The figure is a side view, Figure 3 is a front view showing a conventional boiler tube suspension device, Figure 4 is a longitudinal cross-sectional side view taken along the arrow line in Figure 3, and Figure 5 is a waste heat boiler according to the present invention. 6 is a longitudinal sectional side view taken along the arrow line in FIG. 5, FIG. 7 is a front view showing another embodiment, and FIG. FIG. 7 is a vertical sectional side view taken along the line shown in FIG. 7; 2... Boiler tube, 4... Hanging material, 8...
sleeve.

Claims (1)

[Scope of utility model registration request] A hanging device for a boiler tube of a waste heat boiler, which is equipped with a hanging member that suspends and supports a boiler tube and transmits a striking force to the boiler tube for removing dust attached to the boiler tube, wherein the boiler tube is attached to the boiler tube. A splittable sleeve is fitted so that the entire inner and outer circumferential surfaces of the sleeve are in contact with each other, only the joint ends of the sleeve are welded to integrate the sleeve, and the sleeve and the hanging member are fixed by welding. Features: A hanging device for the boiler tube of a waste heat boiler.