JP3132978B2 - Guide holding structure of heating tube support in heating furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide tube holding structure for a heating tube support in a heating furnace.

[0002]

2. Description of the Related Art In a furnace body of a heating furnace such as an EDC decomposition furnace, a heating pipe for flowing an object to be heated (EDC) is arranged in a meandering manner in a horizontal direction. As shown in FIG. 3, the heating tube is suspended by a hanger 52 provided in a furnace body 51 in a vertical direction. Note that FIG.
Does not show the heating tube.

[0003] The temperature in the furnace body 51 is 800 to 1
Since the temperature is raised to 100 ° C., it is necessary to cool the hanger 52 itself. Therefore, the hanger 52 is formed of a pipe, and the bottom wall 51a of the furnace main body 51 is provided with a cooling air so as to supply cooling air into the hanger 52.
A cooling air hole 53 was formed.

Further, the hanger 52 itself becomes high temperature (for example, about 800 to 900 ° C.).
In consideration of the thermal expansion, the lower end is inserted into a guide recess (constituted of a short tube) 55 provided on the heat-resistant member 54 side in the furnace main body 51 so as to have a predetermined gap a. Had been in the structure.

[0005]

As described above, since the lower end of the hanger 52 is inserted into the guide recess 55 so as to have a gap a, the cooling air flows from the gap a into the furnace body 51. There is a problem that leakage, and consequently, poor heating efficiency, increase fuel consumption and become uneconomical.

Accordingly, an object of the present invention is to provide a guide tube holding structure for a heating tube support in a heating furnace which can solve the above-mentioned problems.

[0007]

In order to solve the above problems, a guide holding structure for a heating tube support in a heating furnace according to the present invention has an upper portion suspended in a heating furnace main body and a bottom wall of the furnace main body. And a structure for guiding and holding a lower portion of a cylindrical heating tube support inserted into a guide recess provided with a cooling air hole formed in the center thereof, wherein the periphery of the cooling air hole is provided. A cylindrical body is provided so as to surround and have an upper part inserted into the inside of the support.

[0008]

According to the above construction, since the tubular body for guiding the cooling air is provided in the tubular support inserted and arranged in the guide recess, the flow resistance of the outflow path of the cooling air is greatly increased. I do. Therefore, the amount of the cooling air supplied into the support leaking out can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2, reference numeral 1 denotes a pyrolysis furnace for an object to be heated (EDC: ethylene dichloride), and a heating tube 3 for flowing the object to be heated is provided inside the furnace main body 2.
Is hung via a hanger 4.

The upper end of the hanger 4 has a furnace body 2.
More specifically, the upper end of the hanger 4 is inserted through the upper wall 2a of the furnace main body 2 and is supported by the mounting member 5 outside thereof.

As the hanger 4, a nickel-chromium steel pipe is used, and cooling air is supplied into the inside of the hanger 4 from the lower end so that the hanger 4 is protected from high temperatures.

That is, a guide cylinder (guide recess) 6 having an inner diameter slightly larger than the outer diameter of the hanger 4 is provided upright on the bottom wall 2 b of the furnace main body 2 corresponding to the lower end of the hanger 4. At the same time, a hole 7 for supplying cooling air is provided in the bottom wall 2 b inside the guide tube 6, and the hole 7 is formed so as to surround the hole 7.
Is provided with a short air introduction cylinder (tubular body) 8 having a diameter that can be inserted into the inside of the cylinder.

In the above configuration, at the time of heating, cooling air is supplied into the hanger 4 from the hole 7 and the air introducing tube 8 to cool the hanger 4. Then, a part of the cooling air supplied into the hanger 4 tends to leak out of the hanger 4, but as shown by an arrow b in FIG. The hanger 4 changes its direction by 180 degrees, and further changes its direction by a 180-degree U-shape at the lower end of the hanger 4 so as to leak from the air introducing cylinder 8 into the furnace main body 1.

As described above, since a 180 degree U-turn is made at two locations, the flow path resistance becomes very large, and the amount of leakage of cooling air can be greatly reduced as compared with the conventional case. In addition, the heating efficiency in the furnace main body is improved, which is very economical.

[0015]

As described above, according to the structure of the present invention, since the cylindrical body for guiding the cooling air is arranged in the cylindrical support inserted and arranged in the guide recess, the flow of the flow path of the cooling air flows out. The resistance can be greatly increased, so that the amount of cooling air supplied into the support leaks out very little, and the heating efficiency in the furnace body is improved and it is very economical.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part in a furnace main body according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a lower end portion of the hanger in the embodiment.

FIG. 3 is a sectional view of a main part of a lower end portion of a hanger in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pyrolysis furnace 2 Furnace main body 3 Heating tube 4 Hanger 6 Guide cylinder 7 Hole 8 Air introduction cylinder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F27D 7/02 F27D 9/00 B01J 19/00 301

Claims (1)

(57) [Claims] 1. A cylindrical heating device having an upper portion suspended in a heating furnace main body and inserted into a guide recess formed in a bottom wall portion of the furnace main body and provided with a cooling air hole at the center thereof. A structure for guiding and holding a lower part of a tube support, wherein a tubular body is provided so as to surround the periphery of the cooling air hole and the upper part is inserted into the inside of the support. Guide holding structure for heating tube support in furnace.