JPH0159512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction method for lining a rotary kiln with bricks.

[Prior Art] For example, in a cement rotary kiln, the calcined body is lined with bricks made of chamomile or high alumina, and the baking point is lined with bricks made of spinel or maguro. When lining these bricks, it is necessary to provide a predetermined amount of expansion absorbing material between the end faces of each brick in the kiln axis direction.

A conventional method for forming this expansion-absorbing allowance is to attach an expansion-absorbing material (mainly cardboard) to bricks before construction, and then use these bricks to line the interior. FIG. 4 is a perspective view of a brick used in this method, in which an expansion absorbing material 2 made of cardboard is pasted on the end face of the brick 1 disposed in the kiln axis direction. There is also a method in which the expansion absorber is not pasted in advance, but the expansion absorber is sandwiched between each brick during brick construction.

The latter method, in which the expansion absorbing material is sandwiched between each brick, is adopted when the brick is delivered without the expansion absorbing material attached for reasons of economy, construction schedule, or the quality of the brick material.

Brick lining construction methods include the jacking method and mechanical construction method. The jack construction method is a method in which the kiln is rotated by a predetermined angle each time a small area of construction is completed, and the bricks are always laid at the bottom or side, making it relatively easy to sandwich the cardboard.

In addition, the mechanical construction method is a method in which the kiln is not rotated, and the lower half of the kiln is constructed in the same manner as the jack construction method, and the upper half of the kiln is constructed using mechanical equipment.

In the case of this mechanical construction, there is a risk that the cardboard may fall if it is simply pinched when bricks are laid in the upper half of the circumference, so the bricks used in this mechanical construction method are delivered with the cardboard glued to the bricks in advance. It is of the type shown in the figure.

[Problems to be solved by the invention] The method of pasting cardboard to bricks in advance, which is mainly used in the mechanical construction method described above, is expensive because each piece of cardboard must be pasted to each brick. The material cost was a significant part of the construction cost.

Furthermore, the method of sandwiching cardboard between each brick at the time of construction significantly reduces construction efficiency.
In particular, the weight of modern bricks is quite large, and it is extremely difficult to hold the brick in one hand while inserting the cardboard with the other hand, so it is extremely difficult to insert the cardboard with the other hand. It will require. For this reason, the construction method in which cardboard is sandwiched between bricks has the problem of lower material costs but lower construction efficiency and a considerable increase in labor costs.

[Means for Solving the Problems] The present invention involves bonding an arc-shaped expansion absorbing material with a length spanning a plurality of bricks to the end face of the bricks lined in a rotary kiln, and then adhering the arc-shaped expansion absorbing material to the end surface of the bricks lining the rotary kiln, and then adjoining the bricks in the axial direction. It was designed so that bricks could be pasted together.

[Function] According to the method of the present invention, there is no fear of the expansion absorbing material falling off since the long expansion absorbing material spanning over a plurality of bricks is pasted onto the bricks, and the pasting can be carried out extremely easily and quickly. . Furthermore, the material cost is lower than in the case of constructing bricks in which each brick is covered with an expansion absorbing material.

[Examples] The present invention will be described in more detail below with reference to examples shown in the drawings.

FIG. 1 is a perspective sectional view of a main part of a rotary kiln for explaining the method of the present invention, and FIGS. 2 and 3 are explanatory diagrams of the shape of an expansion absorbing material.

Bricks 1 are lined in a ring shape within the iron shell of the rotary kiln, indicated by reference numeral 4 in FIG. An arc-shaped expansion absorbing material 3 having a long length is attached to the end face of the ring-shaped brick 1 so as to straddle the plurality of bricks.
In the method of the present invention, the expansion absorbing material 3 is attached to the end face of the lined brick 1, and then the brick 1 is
Bricks are pasted so as to sandwich the expansion absorbing material 3 so as to be adjacent to it.

Note that this wrapping of bricks may be done by either jack construction or mechanical construction.

In addition, in the illustrated example, after bricks are rolled into a ring shape, the expansion absorbing material 3 is glued to the end surfaces of the bricks. The materials may be glued together.

As a method for bonding the expansion absorbing material 3, it is preferable to use double-sided adhesive tape or the adhesive 5. When using double-sided adhesive tape, glue one side of the double-sided adhesive tape to the cardboard in advance.
Preferably, the opposite side of the double-sided adhesive tape is adhered to the brick at the time of construction. In this case, it is preferable that the double-sided adhesive tape has a release paper, and the release paper is preferably peeled off immediately before the work of adhering the cardboard to the bricks.

When an adhesive is used, the adhesive is applied to one or both of the expansion absorbing material and the bricks to bond them together.

In the present invention, cardboard is suitable as the expandable absorbent material. When cardboard is used, this length (dimension a in FIG. 2) is preferably about 500 to 1500 mm. If the diameter is less than 500 mm or more than 1500 mm, handling becomes complicated and work efficiency decreases. Also,
When this cardboard is used, its height (width) b is 100% of the lining thickness of the lining brick.
A preferable range is 75%. The thickness c of this cardboard varies depending on the position where the bricks are used and the material of the bricks, but it is usually preferably 1 to 4 mm.

As the double-sided adhesive tape for adhering the expansion absorbing material to the bricks, vinyl film, polyethylene film, etc. with adhesive properties are suitable, and as mentioned above, tapes with release paper improve workability. suitable.

In addition, when an adhesive is used, well-known rubber latex, vinyl emulsion, acrylic resin using an organic material, and urea resin adhesive are suitable. When applying the adhesive, apply it to the end face of the cardboard or brick after the lining has been applied in advance, and then cover it with release paper. By peeling off the release paper immediately before adhering the expansion absorbent material, the adhesive can be bonded. Work becomes extremely easy.

In addition, the length d of the above double-sided adhesive tape or adhesive is about 80 to 95% of a, and the width e is about b.
Approximately 20 to 60% of the above is suitable. This double-sided adhesive tape or adhesive is used to bond the brick and the expansion absorbing material, and it is sufficient that the adhesive strength is at least as strong as not allowing the expansion absorbing material such as cardboard to fall off.

In addition, after constructing one ring using a mechanical construction method in a cement rotary kiln with a diameter of 5.8 m at the true burning point, the machine was moved and a 50 x 700 mm double-sided adhesive tape was installed.
Immediately before construction, the release paper was removed from the 180 x 800 x 3 mm cardboard and the inner lining brick (
200mm). By repeating this process, the cardboard was adhered to the end faces of the lining bricks all around the kiln. This method allowed brickwork to be carried out extremely efficiently.

[Effects of the Invention] As described above, according to the method of the present invention, the workability of lining a rotary kiln with bricks is extremely improved. In addition, an appropriate amount of expansion and absorption allowance can be uniformly obtained.
Furthermore, the unevenness of the bricks in the direction of the kiln axis is reduced,
Brick jamming will be prevented. Also,
This will prevent workers from getting their fingertips caught in the bricks during brick construction, significantly improving construction safety.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of a rotary kiln explaining the method of the present invention, Fig. 2 is a front view of the expansion absorbing material 3, Fig. 3 is a left side view of the same, and Fig. 4 is a perspective view of the brick 1 used in the conventional method. It is a diagram. 1... Brick, 2, 3... Expansion absorbing material, 5... Double-sided adhesive tape.

Claims (1)

[Scope of Claims] 1. A brick construction method in a rotary kiln in which bricks are lined in a rotary kiln with an expansion absorbing material interposed between the end faces of each brick in the kiln axial direction, comprising: a plurality of bricks as the expansion absorbing material; The method is characterized in that an arc-shaped expansion absorbing material with a length that spans over the bricks is used, and after the expansion absorbing material is adhered to the end face of the lined brick, bricks adjacent to the brick in the direction of the kiln axis are attached. Brick construction method in rotary kiln. 2. The method for constructing bricks in a rotary kiln according to claim 1, wherein after one ring of bricks is pasted, the arc-shaped expansion absorbing material is pasted on the end face of the one ring of bricks. 3. The method for constructing bricks in a rotary kiln according to claim 1 or 2, characterized in that the arc-shaped expansion absorbing material is attached using double-sided tape or adhesive.