JPH0319346B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a double chimney provided with drainage passages.

Some double chimneys use a heat insulating material such as castable material to keep the inside of the double chimney warm. When this castable material is heated by passing smoke, surplus water will be generated in the castable material during construction, but if there is no escape route for this surplus water, the internal pressure inside the double cylinder will increase and the cylinder will bulge inward. There is a risk that the welded part of the outer cylinder will be cut and excess water will blow out from there and stain the outside. One way to solve this problem is to provide drain holes 2 at regular intervals in the inner cylinder 1 of the double chimney, as shown in Figure 6. Corrosive exhaust gas enters the inside of the castable material 3 for heat insulation, causing damage to the castable material 3, inner cylinder 1, and outer cylinder 4.
This would corrode the steel plates, so there is no point in making the chimney a double chimney. There is also a method of providing drain holes 5 at regular intervals in the outer cylinder 4, but in this way, excess water in the castable material 3 can be drained from the drain holes 5.
It blows out and stains the outside surface. There is also a method of providing a drain pipe 6, but this not only impairs the appearance but also increases cost, and neither method can be considered practical.

[Purpose of the invention]

The present invention was made to solve the above-mentioned problems, and is equipped with a drainage passageway that eliminates the risk of corrosion of steel plates due to exhaust gas inside the double chimney, and also eliminates the risk of external surface staining due to excess water. The purpose is to obtain a double chimney.

[Summary of the invention]

The present invention has been made to achieve the above object, and is a double chimney having a heat insulating material between an outer cylinder and an inner cylinder, in which a water drainage passage is provided inside the heat insulating material. It provides:

[Embodiments of the invention]

FIG. 1 is a sectional view showing an embodiment of the present invention.
Steel inner cylinder 10 on exhaust gas side A of double chimney and outside air side B
The interior C of the double cylinder formed by the steel outer cylinder 11 is filled with a heat insulating material 12 to raise the temperature of the inner cylinder 10 to near the temperature of the exhaust gas, and remove corrosive components (SO _x , NO _x , HCl, etc.) to prevent low-temperature corrosion. In this case, as the heat insulating material 12, a castable material having a low specific gravity and good heat insulation properties is filled into the inside C of the double cylinder by, for example, pouring. In this embodiment, before pouring the castable material used as the heat insulating material 12 into the interior C of the double tube, an L-shaped lightweight hole having, for example, a hole 13a shown in FIG. Angle steel 13
are arranged at regular intervals to form a drainage passage D. In this case, a glass cloth 14 is wrapped around the perforated angle bar 13 as shown in FIG. After doing this, castable material is poured into the inside C of the double tube.

The glass cloth 14 serves to absorb the difference in expansion and contraction caused by the expansion and contraction of the inner cylinder 10, the castable material (thermal insulation material 12), the perforated angle iron 13, etc. at their respective temperatures and with their own coefficients of linear expansion after passing through the smoke. It also prevents thermal stress from being generated in each part due to expansion and contraction. The glass cloth 14 is generally effective when the exhaust gas temperature is high, and when the exhaust gas temperature is low, cloth such as hemp or Japanese paper can be used as a sufficient substitute. The number and arrangement of water drainage passages D are determined by the type of castable material (heat insulating material 12), the temperature of the exhaust gas, the rate of rise of the exhaust gas during initial smoke flow, and the like.

Note that instead of the perforated angle steel 13, a lightweight perforated pipe 15 having holes 15a as shown in FIG. 4 is used.
may be used.

The operation of the present invention constructed as described above will be explained as follows with reference to FIG. Now, when smoke is passed through the double chimney, the temperature inside the double chimney rises, which also causes the temperature of the castable material (heat insulating material) 12 to rise. For this reason, the castable material 12 generates surplus water during construction, and this surplus water is passed through the hole 13a (or hole 15a) of the perforated angle iron 13 (or perforated pipe 15) through the gap in the glass cloth 14 to drain water. They will be gathered in aisle D. Thereafter, the water naturally falls down the water drainage passage D, is guided to the lower part of the double chimney, and is collected outside the chimney as indicated by the arrow E through the horizontal draw pipe 20. Note that G in the figure indicates the base of the double chimney.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the following remarkable effects can be achieved.

(1) Since the excess water in the castable material is not directly discharged into the internal exhaust gas or the outside atmosphere, there is no risk of the castable material and the outer cylinder being corroded by the exhaust gas, and there is no possibility that the outside or surrounding area of the outer cylinder will be contaminated by the excess water. There is no risk of it happening. Therefore, the appearance will not be impaired.

(2) It is sufficient to simply use ready-made perforated angle irons, glass cloth, etc., which is extremely inexpensive, and the number can be increased or decreased depending on the conditions.

(3) Glass cloth absorbs the differences in expansion and contraction due to temperature deformation in each part, so no temperature stress occurs.

(4) Since there is an air layer inside the water drainage passage, there is no problem with insulation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 3 is an enlarged sectional view of section a in FIG. FIG. 5 is an explanatory diagram of the operation of the embodiment of the present invention, and FIG. 6 is a longitudinal sectional view showing an example of a conventional double chimney. 10... Inner tube, 11... Outer tube, 12... Insulating material, 13... Perforated angle iron, 15... Perforated pipe.

Claims (1)

[Scope of Claims] 1. A double chimney including a heat insulating material between an outer cylinder and an inner cylinder, characterized in that a water drainage passage is provided inside the heat insulating material. 2. The double chimney according to claim 1, wherein the drainage passage is formed of an L-shaped perforated angle iron or a perforated pipe.