SU1183804A1 - Method of ceramic article burning - Google Patents

Abstract

1. METHOD FOR SINKING CERAMIC PRODUCTS, mainly in an annular kiln by placing products in charge columns, heating, fuel burning and cooling, characterized in that, in order to improve the quality of finished products and reduce scrap, products are laid with a consistently decreasing distance between the posts of the cage from the inner wall of the furnace to the outer one, and the supply of fuel from the inner wall of the furnace is carried out in an amount up to 10% less than from the outer side. 2. A method according to claim 1, characterized in that the ratio of the distance between the subsequent i and the previous columns with respect to the inner kn wall of the furnace is 0.9-0.98. / {the combustion chambers СХ 00 00 Fg / g. /

Description

The invention relates to the manufacture of ceramic products and can be used in refractory production.

The purpose of the invention is to improve the quality of finished products and reduce scrap.

FIG. 1 shows the area of the ring nechi. on the bottom of which two successive cages are installed; in fig. 2 is a cross-section of the set A-A in FIG. one.

The loading of products consists of columns 1-4, between which there are channels for the passage of coolant 5-7. The heat exchange between the columns, for example 2, is set and the coolant is carried out through the side surfaces Si and. A combustion chamber is located between two successive cages.

Calculations show that, in ring furnaces, the distances between the columns of the cage, while ensuring that they are equally heated, should decrease in the direction from the inner wall of the furnace to the outer wall and, with the most common firing modes, the ratio of the distances between the subsequent columns of the cage and the previous ones (to the inner wall of the furnace). channel) lies in the range of 0.9-0.98.

Example. The burning of raw mullite corundum zsdeli, measuring 220X X 114X65 mm, is carried out in an annular furnace with a diameter along the middle lip of the working channel 15.67 m, channel width 1.56 m, height 0.6 m.

four columns with a height of four rows per edge and one for a die (, 521 m), three bricks in a row with a gap between rows of 60 mm (, 79 m). The distance is 250 mm, 2 310 mm, 1.3 370 mm. Given the values of mm, Vi 5 m / s, taking at an average temperature of gases in the furnace 700 ° С9 115 ,, 71-10 W / (m.KR, J5 0.362 kg / m, Wed 1.135 kJ / (kg.K ) and wire calculations, we obtain the values of the distances

between the second and third columns of the set, mm, between the third and fourth, 2bz 120 mm. Thus, the calcination is carried out by successively passing a four-column set-up, the distance between the first and second (with respect to the inner wall of the furnace channel) of which is 140 mm, the second and third 130 mm, the third and fourth 120 mm , through the heating, calcining and cooling zones of the ring kiln. Fuel supply

In the burning zone on the side of the inner wall, the furnace is carried out in an amount that is 10% smaller than on the outer side.

The results of the experimental roasting of mullite-corundum refractories in a tunnel-ring kiln are given in the table.

The use of the proposed firing method made it possible to reduce the reject rate during the experimental firing from 7 to 5%, to increase the compressive strength, which reflects the quality of the finished product, from 95 to MPa.

140

0.93

130

120

Izvesti1 130 130

130 th

110

95

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Aa

Claims (2)

1. METHOD FOR CERAMIC PRODUCTS FIRING, mainly in a ring furnace by laying products in cage columns, heating, firing with fuel supply and cooling, characterized in that, in order to improve the quality of finished products and reduce marriage, the products are laid with a successively decreasing distance between columns of the charge from the inner wall of the furnace to the outer, and the fuel supply from the side of the inner wall of the furnace is carried out in an amount up to 10% less than from the outside. 2. The method according to π. 1, characterized in that the ratio of the distances between subsequent q and previous columns with respect to the inner ® wall of the furnace is 0.9-0.98. SU „, .1183804 FIG. 1