JPS59176576A - Steam tube drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a steam tube dryer.

Conventionally, when producing gypsum, which is a material for gypsum boards that has excellent properties as a heat-resistant and fire-resistant material, raw gypsum is put into a rotary kiln and fired.
In this conventional structure, since the gypsum was fired under atmospheric pressure, the gypsum obtained by firing was β-type, and the gypsum that was not strong enough in bending and compression could only be obtained.

Therefore, the present invention provides a steam tube dryer that solves these problems, and its feature is that a screw conveyor is inserted into the inlet and outlet of the steam tube dryer main body which is rotated by a drive device. On the other hand, a steam neck having a steam inlet and a steam outlet is fitted onto the screw conveyor, a steam supply path is provided that communicates the steam inlet with the steam header of the steam tube dryer body, and the steam outlet and the steam neck of the steam tube dryer body are connected to each other. According to this configuration, when the insides of both screw conveyors are filled with the materials to be fired, the inside of the steam tube dryer body becomes sealed. Therefore, when used for firing gypsum, for example, the gypsum is heated within the steam tube dryer body, resulting in 2
Aqueous salt changes to semi-hydrated salt, and the water produced during this change evaporates, creating a pressurized state inside the steam tube dryer body. Therefore, gypsum is fired in that pressurized state and α
It is possible to obtain plaster that can be molded and has sufficient bending and compression strength.

An embodiment of the present invention will be described below with reference to the drawings. This embodiment relates to a steam tube dryer used for firing gypsum, and (1) is a steam tube dryer main body, which has an inlet cylindrical part (2) at one end, and a steam header (3) and a drain chamber at the other end. (4),! :, Outlet cylindrical part (5
). (6) is a finned steam tube disposed within the dryer body (1) and communicates with the steam header (3) through a hole in the tube plate (7). (8
) is an annular body (9) fixed to both ends of the dryer body (1).
) is in contact with the dryer body (1) ft, and σO is a supporting roller that rotatably supports the dryer body (1), and σO is a small gear a that fits into the large gear (11) fixed to the dryer body (1).
A drive motor (14) (l) rotates the dryer body (1) by rotating the dryer main body (1) by rotating
υ is the sea 7 inside the cylindrical part (2) (5) at the inlet p and outlet.
The screw conveyor on the inlet side and the outlet side is inserted through the material and the bearing σ0, and the product inlet σ7
) (To) and a cylindrical casing Q old 2z having a product outlet G (A), a screw 1231 (t241) fixedly and rotatably disposed in the casing (1), and the screw 1
23) Connect t241 to sprocket wheel (7 Shikusha) 202
and a change '71 (drive motor (29) (support) rotated via 281). The container is the outlet cylindrical part (5) Ic sheathing material and bearing t
a3) An inner tube and an outer tube that are concentrically fitted and fixed to the tube plate (7) via i, and a steam supply path is provided between the inner tube opening 0 and the outlet cylindrical portion (5). A steam exhaust path al19 is formed between the inner tube opening) and the outer tube 13z.

The steam neck is fitted onto the outer tube +35 via a sealing material and a bearing βη, and its interior is connected to the steam supply chamber 9) and the steam exhaust chamber ←0 by the sealing material and bearing βη.
) and b. The steam supply chamber 391K has a steam inlet D, and the steam exhaust chamber←α has a steam outlet (
This is what forms the scepter. Further, the steam supply chamber 139) is communicated with the steam supply path, and the steam discharge chamber (40) is communicated with the steam discharge chamber.

(44) is a steam supply pipe that communicates the steam supply path (341 with the inside of the steam header (3)), and (44) is a steam supply pipe that communicates with the inside of the steam header (3).
Steam exhaust pipe (46
is a raking blade arranged opposite to the product inlet (to) of the exit side screw conveyor (to) in the dryer main body (1).

The gypsum firing procedure will be explained based on the above configuration. First, the drive motor αOf is activated and the reducer a3. The steam tube dryer main body (1) is rotated via the small gear @ and the large gear Qll'fI-. Also steam inlet f4
1) Supply steam into the steam supply room domestically. Then, the steam is transferred to the steam supply line (goods), the steam supply pipe rises and the steam header (3)'t to each steam tube (6).
The inside of the dryer body (1) is heated. The heated steam entering the drain chamber (4) from each steam tube (6) is discharged from the steam outlet (C) through the steam exhaust pipe (X), the steam exhaust path (C), and the steam exhaust chamber ntiv.

Raw gypsum is introduced into the inlet side screw conveyor (141) from the product inlet αη.Then, the gypsum is delivered into the side dryer body (1) by the screw rotated by the drive motor. The gypsum that has entered the dryer body (1) is gradually moved in the direction of the arrow (A),
Also, it is mixed by the rotating dryer main body (1). During this time, the high heat emitted from the steam tube (6) burns the dihydrate salt (2C!a SD4/2H
,O) Kara hemihydrate (2CaSO4・4H,o+3H,o
) [cover. The calcined gypsum is scraped up by scraping blades (9) and fed from the product inlet (toward) into the exit side screw conveyor (toward), and is transferred to the product outlet (toward) by a screw rotated by a drive motor (30). ) is discharged from. In addition, in this state, since the inside of both screw conveyors (141 (to)) is filled with gypsum, the inside of the dryer body (1) becomes sealed, and the water (3H, O) that is generated when the dryer body (1) becomes a semi-hydrated salt. The evaporated steam puts the inside of the dryer body (1) under pressure.Therefore, the gypsum inside the dryer body (1) becomes α-type due to the pressurization.

As described above, according to the present invention, when the insides of both screw conveyors are filled with the materials to be fired, the inside of the dryer body is sealed by the steam tube. therefore,
For example, when the gypsum is heated in the steam tube dryer body, it changes from dihydrate salt to hemihydrate salt, and the water produced during this change evaporates, causing becomes pressurized.

Therefore, when gypsum is fired under pressure, it becomes α-shaped υ, and gypsum with sufficient bending and compression strength can be obtained.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the present invention. (1)...Steam tube dryer body, (2)...
・1i inside the entrance! , (3)...Steam header, (4
)...Drain chamber, (5)...Exit cylindrical part, (6)...
...Steam tube, α4...Inlet side screw conveyor, (to)...Outlet side screw conveyor 1341.
・・Steam supply path, (to) ・・Steam discharge path, (branch)・・
・Steam neck, (4η...Steam inlet, ■...Steam outlet agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. Insert a screw conveyor into the inlet and outlet of the steam tube dryer main body that is rotated by a driving device, fit a steam neck having a steam inlet and a steam outlet onto one of the screw conveyors, and connect the steam inlet and steam tube. A steam tube dryer characterized in that a steam supply path is provided that communicates with a steam header of the dryer body, and a steam exhaust path is provided that communicates a steam outlet with a drain chamber of the steam tube dryer body.