JPS635666B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for fixing a metal gas introduction pipe to a ceramic retort used in a fluidized bed heating furnace.

[Prior Art] Conventionally, fluidized bed heating furnaces have been used for metal heat treatment, etc., but since these furnaces are equipped with metal retorts, they cannot heat up to about 1100℃ in terms of heat resistance. This was the limit, and there was concern about heating in a higher temperature zone.

[Problems to be Solved by the Invention] Therefore, attempts have been made to provide a ceramic retort in place of the metal retort to further increase the heat resistance. There was a problem that it became difficult to fix the gas introduction pipe.

In other words, when a metal retort is installed, a metal gas inlet pipe can be fixed to it by welding, but when a ceramic retort is installed, this becomes difficult and other suitable methods are used. It must be fixed by a suitable method, such as a method using an adhesive or a method using bolts.

However, the method using adhesive has the disadvantage that sufficient adhesive strength cannot be obtained, and the method using bolts requires multiple bolt insertion holes in the retort, which significantly deteriorates the strength of the retort. However, even if these drawbacks are ignored, cracks occur in ceramic retorts due to the difference in thermal expansion between metal and ceramic, which are dissimilar materials. It was hot.

Incidentally, if the gas introduction tube could be made of ceramic, this problem could be solved, but sufficient tube strength would not be obtained. It is difficult to use a metal gas introduction pipe because of the fatal drawback that it is difficult to process the thread for connection to the metal main pipe connected to the gas supply source. I have no choice but to stick to it.

The present invention has been developed by paying attention to the above-mentioned problem, and has been obtained as a result of intensive studies from various aspects in order to solve this problem.

[Means for Solving the Problems] That is, the method for fixing a metal gas introduction pipe to a ceramic retort according to the present invention is a method for fixing a metal gas introduction pipe to a ceramic retort used in a fluidized bed heating furnace. In the method, the gas injection side of the gas introduction pipe protrudes into the retort through a heat-resistant tapered packing inserted into a tapered hole provided through a bottom wall or a lower part of a peripheral side wall of the retort; A metal locking body for preventing removal is fixed to one end, and a metal parallel key is fixed to the other end on the gas supply side of the gas introduction pipe protruding outward from the retort, and a parallel metal key is fixed to the other end on the gas supply side. A jacket portion is formed on the outer peripheral surface of the other end, and a metal outer cylindrical body is attached to the other end on the gas supply side so as to be able to move in the axial direction of the gas introduction tube while being guided by the parallel key. Further, a metal pressing nut screwed onto the other end of the gas supply side is brought into contact with one end of the outer cylindrical body to press the other end of the outer cylindrical body against the tapered packing. That is.

[Example] Hereinafter, an example will be described based on the drawings. In Fig. 1, 1 is a cylindrical container-shaped ceramic retort, and 2 is a retort installed in the retort 1 so as to divide the inside of the retort 1 into upper and lower parts. gas disperser,
3 is a metal gas introduction pipe, 4 is an electric heater, 5, 6
denotes a heat insulating material, 7 and 8 denote refractory bricks, and the gas dispersion device 2 is connected to the retort 1 via a heat-resistant adhesive.
It consists of a porous ceramic plate 2a fixed to the plate and a heat-resistant non-woven filter placed on the underside of the plate, and the gas introduction pipe 3 is installed as shown enlarged in FIG. There is.

That is, in FIG. 2, 9 is the bottom wall 1 of the retort 1.
a taper hole penetrated, 10 taper hole 9
heat-resistant tapered packing made of carbon graphite inserted into the holder, 11 is a metal locking body for preventing removal, 12 is a metal parallel key, 13 is an outer cylinder body, 15
respectively indicate heat-resistant sheet packing, and the metal locking body 11 is welded to one end A on the gas ejection side of the gas introduction pipe 3 that penetrates the heat-resistant tapered packing 10 and protrudes into the retort 1. The metal parallel key 12 is fixed to the other end B on the gas supply side of the gas introduction pipe 3 protruding outward from the retort 1, and the outer cylinder 13 is fixed to the other end B on the gas supply side. A jacket portion 14 is formed on the outer peripheral surface of the gas introduction tube 3, and the jacket portion 14 is attached to the other end B on the gas supply side so as to be able to move in the axial direction of the gas introduction tube 3 while being guided by a metal parallel key 12.

Note that a metal pressing nut 16 is screwed onto the other end B on the gas supply side, and this nut 16 is brought into contact with one end of the outer cylinder 13 so that the other end of the outer cylinder 13 is heat-resistant. A metal lock nut 17, which is pressed against the taper packing 10 and screwed onto the other end B on the gas supply side, is pressed against the pressing nut 16 to prevent the pressing nut 16 from freely rotating. There is. Further, a metal support 21 is welded to the tip on the gas ejection side, and this support 21 supports the porous ceramic plate 2a and a heat-resistant nonwoven filter disposed on the lower surface thereof. 22 is a gas introduction pipe 3 via a pipe joint.
This is the gas supply pipe connected to the

In this way, in this embodiment, since the metal gas introduction pipe 3 is fixed using one tapered hole 9 penetrated through the bottom wall 1a of the ceramic retort 1, deterioration of the retort strength can be prevented. It is possible to aim for

Moreover, since the gas introduction pipe 3 is provided so as to penetrate the heat-resistant taper packing 10 inserted into the taper hole 9, a complete gas seal can be achieved.

Furthermore, the gas introduction pipe 3 is guided by the parallel key 12.
Since the outer cylindrical body 13 is mounted so that it can be moved in the axial direction of the
3 can be moved in the axial direction of the gas introduction pipe 3 and brought into pressure contact with the heat-resistant taper packing 10, and the rotation of the outer cylindrical body 13 can be prevented by the parallel key 12, so that the heat-resistant taper packing 10 can be pressed against the heat-resistant taper packing 10. Since it can be pushed into the tapered hole 9 without rotation, damage to the sealing surface of the heat-resistant tapered packing 10 can be prevented.

In addition, when operating the furnace, the pressure chamber 1 is
Fluidizing gas is ejected into the processing chamber 9, uniformly dispersed by the gas dispersion device 2, and flowing into the processing chamber 20, where it fluidizes the alumina particles filled there and forms a so-called fluidized bed. , this fluidized bed is heated to a predetermined temperature by an electric heater 4.

For this reason, the metal gas introduction pipe 3 is also heated during furnace operation, but since the outer cylinder 13 is attached to form the jacket part 14, the pressing nut 16 and lock nut 17 are prevented from seizing. can be achieved. That is, by attaching the outer cylinder 13, both the nuts 16 and 17 can be screwed at a position away from the bottom wall 1a of the retort 1, and the formation of the jacket part 14 can prevent excessive heat conduction. This makes it possible to prevent seizure.

Although one embodiment has been described above, in the present invention, pressurized air can be supplied to the jacket part 14 to forcibly cool it, or a plurality of short tubes 13a of the outer cylinder 13 can be Through holes or fins may be provided. Note that the metal gas introduction pipe 3 is also connected to the lower part of the peripheral side wall of the retort 1 (the first
It may be fixed to part C shown in the figure).

[Effects of the Invention] As described above, according to the present invention, regarding the method of fixing a metal gas introduction pipe to a ceramic retort used in a fluidized bed heating furnace, prevention of deterioration of retort strength, perfect gas sealing, and packing can be achieved. It is possible to obtain a fixing method that prevents damage to the sealing surface of the nut and prevents the nut from seizing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a fluidized bed heating furnace, and FIG. 2 is a longitudinal sectional view showing how a metal gas introduction pipe is fixed to a ceramic retort. 1... Ceramic retort, 1a... Bottom wall,
3...Metal gas introduction pipe, 9...Tapered hole, 1
0...Heat-resistant taper packing, 11...Metal locking body for preventing removal, 12...Metal parallel key, 1
3... Metal outer cylindrical body, 14... Jacket part, 1
6... Metal pressing nut, A... One end on the gas ejection side, B... The other end on the gas supply side, C... Lower part of the circumferential wall.

Claims (1)

[Claims] 1. In a method for fixing a metal gas introduction pipe to a ceramic retort used in a fluidized bed heating furnace,
At one end on the gas ejection side of the gas introduction pipe that protrudes into the retort through a heat-resistant tapered packing inserted into a tapered hole provided through the bottom wall or the lower part of the peripheral side wall of the retort. A metal locking body for preventing removal is fixed, and a metal parallel key is fixed to the other end on the gas supply side of the gas introduction pipe protruding outward from the retort, and the other end on the gas supply side is fixed. a jacket portion is formed on the outer peripheral surface of the pipe, and a metal outer cylinder is mounted on the other end of the gas supply side so as to be able to move in the axial direction of the gas introduction pipe guided by the parallel key, and further Made of ceramic, characterized in that a metal pressing nut screwed onto the other end of the gas supply side is brought into contact with one end of the outer cylindrical body to press the other end of the outer cylindrical body against the tapered packing. How to secure a metal gas introduction pipe to a retort.