JPS5842023Y2 - Heat insulation support ring for cylindrical container - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a support ring for holding a heat insulating material made of a regular refractory material on the outer wall of a cylindrical container of a reaction tower for petroleum refining used at high temperatures. .

Conventionally, the following method has been known as a method for attaching a support ring to the outer surface of a cylindrical container.

That is, one method is to attach a support ring 1 divided in the circumferential direction to the outer surface 3 of the container wall 2 by an interrupted connection 4, as shown in FIGS. 1 and 2 of the attached drawings. .

However, this method has the disadvantage that when the temperature reaches high temperatures during plant operation, the difference in coefficient of thermal expansion between the vessel wall 2 and the support ring 1 causes distortion and deformation, and the welding points are long, so the welding heat is transferred to the vessel material. have a negative impact on
The drawback was that there was a risk of cracking due to residual stress.

To remedy this drawback, other conventional methods are also known, as shown in FIGS. 3 and 4.

That is, in the figure, a lug 5 is attached to the outer surface 3 of the container wall 2 by welding 6, and a support ring 7 is attached to the lug 5 with bolts 8 and nuts 9.

In this case, the fixing hole 10 made in the support ring 7 is made into a long hole so as to absorb the difference in thermal expansion.

According to this method, the problem of distortion and deformation due to the difference in thermal expansion is certainly solved, but in order to absorb the difference in thermal expansion, it is more convenient to divide the support ring 7 into smaller pieces, but this increases the processing cost. In addition, in order to ensure the strength of the support ring 7, the span between the lugs 5 must be shortened. Therefore, a large number of lugs 5 are required, and a large number of welds are required. The length is not substantially shortened, and the problem of adverse effects due to welding heat is not solved.

Furthermore, when transporting this container, the lug 5, which is a fairly large protrusion, becomes an obstacle, and there is a high possibility that the lug 5 will be damaged, especially during loading and unloading.

The object of the present invention is to provide a support ring structure for a heat insulating material that eliminates the drawbacks of the conventional methods described above.

Hereinafter, the present invention will be explained based on FIGS. 5 and 6 of the accompanying drawings showing one embodiment thereof.

As shown in the figure, a stopper 11 made of a small square piece (approximately 1Q mm square x 20 mm) made of the same material as the container is attached to the outer surface 3 of the container wall 2 by fillet welding 12.

Next, a suitable number (four in the example shown in the figure) of support rings 13 made of angle iron, which are divided into arc shapes whose inner radius is approximately equal to the outer radius of the container, are bolted together at their ends. 14 and nuts 15 via spring washers 16 to form the entire support ring.

In this case, the entire support ring shall be mounted on the outer surface 3 of the container wall 2 so as to rest on each stopper 11.

In the support ring according to the present invention configured as described above, by selecting a material with a coefficient of thermal expansion smaller than that of the container wall 2 as the material for the support ring 13, it is possible to , will be tightened with a larger force and will be firmly fixed to the outer surface 3 of the container.

At this time, since the support rings 13 are tightened through the spring washers 16, the force received by each support ring 13 is uniform even if the deformation of the outer wall 2 is not necessarily uniform, and therefore the stress received by each support ring 13 is uniform. Also, the number of divisions of the support ring 13 may be small.

Therefore, since the structure is simple, it can be manufactured at low cost.

Furthermore, the shape of the stopper 11 is small, and the tightening due to the difference in thermal expansion uses force, so there is a margin for strength, and the number of stoppers 11 does not need to be small, the amount of welding is greatly reduced, and the Thermal effects on the container wall can be reduced, and cracking caused by residual stress due to welding can therefore be prevented.

In addition, since the stopper is such a small size, it will not interfere with the transport and become a hindrance, and unlike the aforementioned lug 5, it will not be damaged during loading and unloading.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional heat retention support ring, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a plan view showing another conventional heat retention support ring. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a plan view showing one embodiment of the thermal support ring according to the present invention, and FIG. be. 2...Container wall, 3...Outer surface of container wall 2, 11...Stopper, 13...Support ring, 14...Bolt , 15...
・Natsuto, 16... Spring washer.

Claims (1)

[Scope of utility model registration request] 1. On the outer wall of a reaction tower for petroleum refining used at high temperatures,
In a support ring for holding a heat insulating material made of a regular refractory material, the outer surface 3 of the container wall 2 of a cylindrical container
An appropriate number of stoppers 11 are attached by welding to the circumference of the container at the same height, and each end is divided into a plurality of parts, each end of which can be connected to each other with bolts and nuts (14.15), and shaped into an arc. Configured support ring 13
is attached to a position where its lower surface contacts the upper surface of the stopper 11, and the material of the support ring 13 is made of a material having a coefficient of thermal expansion smaller than that of the material of the container. 2. Connect each end of the support ring 13 with a spring washer 16
14.15. The heat insulating material support ring according to claim 1 of the utility model registration claim.