SU1346934A1 - Rotary furnace lining - Google Patents

Abstract

The invention relates to heat engineering and can be used when performing lining work in a rotary kiln. To reduce heat losses and increase durability, the lining of the rotary kiln contains refractory blocks 2, 3 with a shell installed with a gap to the furnace casing, and includes U-shaped hollow plates 4 installed with a gap, on which smaller blocks are laid, stacked in a staggered order, and the gaps in the lining are filled with fibrous insulating materials. The ratio of the height of the largest block to the height of the U-shaped plate is taken from 2 to 8, and the cavity of the U-shaped plates is filled with heat insulating material or used without filling with this material. 2 h. the item f-ly, 3 ill., 1 tab. oo 4 o: co oo 4 figure 1

Description

The invention relates to heat engineering and can be used when performing lining work in a rotary kiln.

The purpose of the invention is to reduce heat loss and increase the durability of the lining.

The lining of the rotary kiln contains refractory blocks with a shell installed with a gap to the furnace casing, and includes U-shaped hollow plates mounted with a gap, on which lower-height blocks are laid, staggered, and the lining gaps are filled with fibrous heat insulating material. Moreover, the ratio of the height of the largest block to the height of the U-shaped plate is 10

with bricks mounted on them of 3. smaller height, the following, adjacent to it, is formed by bricks of greater height, etc.

On the outer side of the furnace body with a gap of 6, the heat insulation 7 is of a lightweight type (made of fiberglass, asbestos fabric or basalt fabric).

The surface of the lining is covered with a protective coating of abrasion-resistant material.

Lining works as follows.

The heat flux from the hot gases and the burning material moving inside the furnace unit is in contact with the surface of bricks 2 and 3 with abrasion resistant material.

wipe from 2 to 8, and the cavity of the U-shaped plaster. Through the thickness of bricks 2 and 3, tin is filled with thermal insulating material or used without filling with this material.

FIG. 1 shows a lining formed by bricks laid in a checkerboard pattern; in fig. 2 shows section A-A in FIG. one; in fig. 3 - lining formed by bricks laid on a ring.

The lining of the rotary stove furnace contains bricks 2 of greater height and bricks 3 of smaller height laid in a staggered order on the case 25 of the furnace 1, U-shaped plates 4, the cavities of which are filled with thermal insulating material 5, are installed in the gaps between them.

The lining can be formed by kir-ZO pitsi 2 and 3, alternating rings mounted on the inner surface of the furnace body: the ring formed by bricks 2 of greater height is followed by an adjacent ring of U-shaped plates 4

heat flux due to thermal conductivity transfers part of its heat directly to the furnace body, which passes through short bricks 3 with an insulating layer 5. The latter can be airborne or filled with insulating material. At the same time, approximately 50% of the lining surface significantly reduces heat loss through the furnace body. Further, the heat flow is retained by the insulating sheath 7 and, since the air cavity between the furnace body 1 and the sheath 7 is also an insulating layer, the heat loss through the sheath 7 is sharply reduced. Ultimately, the heat loss by the furnace body in the decarbonization and preparatory zones decreases dramatically. Heat saving is 6-8% of consumable fuel.

Indicators of the properties of the proposed lining are presented in the table in comparison with the known lining.

The ratio of the height of the largest block to the height of the U-o6 fold plate

Filling cavities and gaps with insulating material

Thermal conductivity of the lining, W / (m.K)

with bricks mounted on them of 3. smaller height, the following, adjacent to it, is formed by bricks of greater height, etc.

On the outer side of the furnace body with a gap of 6, the heat insulation 7 is of a lightweight type (made of fiberglass, asbestos fabric or basalt fabric).

The surface of the lining is covered with a protective coating of abrasion-resistant material.

Lining works as follows.

The heat flux from the hot gases and the burning material moving inside the furnace unit is in contact with the surface of bricks 2 and 3 with abrasion resistant material.

a plaster. Through the thickness of bricks 2 and 3

 a plaster. Through the thickness of bricks 2 and 3

heat flux due to thermal conductivity transfers part of its heat directly to the furnace body, which passes through short bricks 3 with an insulating layer 5. The latter can be airborne or filled with insulating material. At the same time, approximately 50% of the lining surface significantly reduces heat loss through the furnace body. Further, the heat flow is retained by the insulating sheath 7 and, since the air cavity between the furnace body 1 and the sheath 7 is also an insulating layer, the heat loss through the sheath 7 is sharply reduced. Ultimately, the heat loss by the furnace body in the decarbonization and preparatory zones decreases dramatically. Heat saving is 6-8% of consumable fuel.

Indicators of the properties of the proposed lining are presented in the table in comparison with the known lining.

1.28 2.56

3 „2

The proposed lining is characterized by increased durability by increasing the rigidity of the lining structure.

Claims (3)

1. The lining of the rotary kiln, containing refractory blocks, installed with a gap to the furnace shell, characterized in that, in order to reduce heat losses and increase the durability of the lining, it it is made of uneven blocks, equipped with U-shaped hollow plates installed in the gap, on which blocks of lesser height are supported. 2. Lining according to claim 1, characterized in that the ratio of the height of the larger block to the height of the U-shaped plate is 2-8. 3. Lining on PP. 1 and 2, characterized in that the cavities of the U-shaped plates are filled with heat insulating material. FIG. 2 FIG.