JPH0732474Y2 - Powder-filled jacket type container heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] Many jacket type container heaters are used in the chemical industry, petrochemical industry, and the like.

The jacket type includes a spiral baffle jacket, a split coil jacket, a coil welding jacket, and the like.

The present invention relates to the above jacket type container heater.

[Prior Art] Fig. 3 shows a conventional jacket-type vessel heater (published by Engineering Book Co., Ltd., Heat Exchanger Design Handbook, 862).
Page ・ Figure 24.6 Jacket model)

In FIG. 3, the container is a body 1, a lid 2, bolts and nuts 6,
It is composed of a gasket 7, a jacket 3, a flow path 4 and a heat insulating material 8.

The jacket 3 is continuously welded to the barrel by welding 5.

FIG. 4 (A) shows an example of a half coil jacket, but the half coil jacket 9 is attached to the body 1 by welding 5.

FIG. 4 (B) shows an example of a coil welding jacket. In order to improve conduction and heat transfer, the coil 10 is continuously welded in the circumferential direction by the welding 5 via the pedestal 11 and is attached to the body 1. And there are no gaps between the metals.

[Problems to be Solved by the Invention] When the jacket is attached to the body by welding as described above, there are the following problems.

It is necessary to perform continuous welding over the entire circumference of the body and for each of a large number of steps, which requires a large amount of work, resulting in a large number of man-hours and a long construction period. Further, the fluid flowing in the flow path has a pressure, and perfect welded joint performance to withstand the pressure is required. If welding is insufficient, fluid leakage occurs and heat exchange performance deteriorates.

Titanium or stainless steel is used when the fluid in the body is highly corrosive, and high-strength steel such as nickel-chromium-molybdenum steel is used when the pressure is high, but these have better weldability than low-carbon steel. However, since the welding work requires a considerable amount of labor and cost, the welding jacket with a large amount of welding must be forgotten to be adopted, and the container may have to be attached to an oil bath or a hot water bath.

When the shell is thin, welding of the jacket causes distortion of the shell, resulting in deterioration of strength.

Depending on the usage conditions of the container, the contents may be replaced by pressurizing and heating, then depressurizing and cooling the contents. In this case, since repeated loads act on the body and jacket of the container, the fatigue strength affects the life of the container. Particularly, since the jacket welded portion is structurally discontinuous and stress concentration is large, the fatigue strength is reduced and the life of the container is shortened.

Especially when used under ultra-high pressure, the life is remarkably shortened, and the welded portion is damaged and destroyed, which is very dangerous.

In addition, the welded part of the jacket is subjected to surface permeation inspection such as liquid permeation inspection or magnetic particle flaw detection. However, the X-ray and ultrasonic flaw detection, which are effective for inspection inside the welded part, have a concavo-convex shape at the welded part of the jacket However, it is extremely difficult to apply, and it is impossible to inspect for defects inside the weld. Therefore, internal defects are inevitably left behind, which accelerates the development of fatigue cracks and causes destruction.

[Means for Solving the Problems] The present invention is to solve the above problems, and in a jacket-type container heater having a jacket on the outside of the body of the container, a heat transfer coil is disposed in the jacket. Further, the present invention is a powder / granule-filled jacket type container heater characterized by being filled with powder / granular material of a material having higher thermal conductivity than the material of the body of the container.

[Operation] FIG. 1 shows a schematic view of the heater according to the embodiment of the present invention.

The jacket is made of a material having a higher thermal conductivity than the material of the body of the container, for example, the powder particles 18 in which graphite powder particles are filled in the gaps of the activated alumina powder particles are filled with the heat transfer coil 10 in a coil shape. The outer surface is covered with cover plate 13. FIG. 2 is a partially enlarged view thereof, but as shown in the figure, the heat of the flow path 4 is transferred to the adhered granular material 18 via the heat transfer coil 10 and heats the in-body object via the body 1. Has an effect.

Here, the thermal conductivity of a single 1 mm ball of activated alumina is approximately 190 kcal.
/ m ・ hr ・ ° C, graphite alone is about 20 kcal / m ・ hr ・ ° C, and the thermal conductivity as a mixture when filled as in this example is about
70kcal / m ・ hr ・ ℃

The thermal conductivity of SUS304, which is the material of the body 1, is 14 kcal / m ・
The heat transfer performance is up to 5 times that of the body.

Therefore, even if the heat transfer coil is not attached to the body of the container by welding, the heat of the heat medium flowing in the heat transfer coil can be efficiently transferred into the container.

[Embodiment] An embodiment of the present invention will be described with reference to FIG. The container receives crude oil containing H ₂ S at 60 ° C and is heated so that there is no temperature drop. The main specifications are as follows.

Inner diameter: 1000mm Body length: 3000mm Content liquid: Crude oil containing H ₂ S (inside body), steam (inside coil) Temperature: 60 ℃ (inside body), 170 ℃ (inside coil) Pressure: 430kg / cm ² G (inside the body), 7kg / cm ² G (inside the coil) Material: SUS304 (body), STPG38-s (coil) Thickness 250mm, diameter 25mm Filling material: Activated alumina 1mm sphere + graphite filled Outside of the body 1 A support ring 12 is continuously welded on the lower part on the circumference, a cover plate 13 is attached to the support ring by welding, and a heat transfer coil 10 is loaded therein. Steam enters at inlet nozzle 19 and exits at outlet nozzle 20.

After that, the filling material 18 is loaded from the upper part, and the cover plate 15 is attached to the lugs 14 (circumferential four places) welded to the case and the flange portion of the cover plate with bolt nuts 16 and 17.

The enlarged view is shown in Fig. 2. The filler 18 is in close contact with the heat transfer coil 10 and the body 1, and the thermal conductivity is about 70 kcal.
/ m · hr · ° C could be obtained.

Further, in addition to this embodiment, if graphite is mixed with a heat transfer oil to form a mortar, and the gap between the aluminum-based or copper-based powder and granules is filled, it adheres well to the body of the container and the heat transfer coil. The thermal conductivity equal to or higher than that of the example could be obtained. Also, aluminum-based or copper-based powder or granules may be filled alone or mixed, but the thermal conductivity in this case is about 20 kcal / m ・ hr ・
℃.

FIG. 1 (B) is a view AA of FIG. 1 (A) and shows the structure seen from the lid plate 15.

The jacket has 12 support rings and 1 cover plate.
3. It is composed of a lug 14 and a cover plate 15.

[Effects of the Invention] Since the present invention is configured as described above, the above-mentioned effects have the following effects.

Since the heat transfer part having a pressure is not directly welded to the body, the discontinuous part (the part having structural irregularities) where high stress is generated disappears, the part with weak fatigue strength disappears, and the damage and the fracture are reduced.

With this method, the heat transfer coil can be mounted safely even if a material with poor weldability is used for the body.

Even if the shell is thin, only a small amount of welding will cause no distortion, and strength deterioration will not be a problem.

As for the heat transfer coil, in the case of this embodiment, the circumferential joint of the seamless pipe is completely penetration welded, and the number of joints is only one in about 5 m, and non-destructive inspection can be performed completely on the surface and inside, and reliability is high. Can be a high coil.

As described above, the present invention has few parts to be welded to the body and is extremely easy to install.

[Brief description of drawings]

FIG. 1 is a schematic view of a container heater of an embodiment of the present invention, (A) is a side sectional view, (B) is a view taken along line AA of (A), FIG. 2 is a partially enlarged view thereof, and FIG. Is a side sectional view showing an example of the structure of a conventional heater, and FIGS. 4 (A) and 4 (B) are partially enlarged views showing another example of the structure of the conventional heater. 1 ... Trunk, 2 ... Lid 3 ... Jacket, 4 ... Flow path 5 ... Welding, 6 ... Bolt nut 7 ... Gasket, 8 ... Heat insulating material 9 ... Half coil, 10 ... Heat transfer coil 11 ... Pedestal, 12 ... Support ring 13 ... Cover plate, 14 ... Lug 15 ... Lid plate, 16, 17 ... Bolt nut 18 ... Filling material, 19 ... Inlet nozzle 20 ... Outlet nozzle

Claims (1)

[Scope of utility model registration request] 1. A jacket-type container heater having a jacket on the outside of a container body, wherein a heat transfer coil is arranged in the jacket and powder particles of a material having a higher thermal conductivity than the material of the container body. A jacket-type container heater filled with powder particles characterized by being filled with a body.