SU1332127A1 - Lining for rotating furnace - Google Patents

Abstract

The invention relates to heat engineering and can be used. when refining the linings of rotary kilns used in the cement industry. In order to intensify the heat exchange while improving the granulation of the calcined material due to a decrease in the sand fraction of 0-3 mm, the lining is made of refractory blocks covered with metal finned heat exchange sections, each of which is filled in an arcade, and the ribs are arranged: diagonally in the section in transverse rows and with the formation of a broken line in longitudinal rows. Due to the intensification of heat exchange in the kiln in the 5x185 m furnace, the specific consumption of reference fuel is reduced to 118 kg / t, the temperature of the gases leaving the furnace is reduced to 260 ° C, the content of sand fractions is 0-3 mm in clinker reduced to 8%. 2 Il. 1 tab. about s (l

Description

The invention relates to heat engineering and can be used to fill the linings of rotary kilns from refractory; block with heat exchanging metal sections with a rib used in cement industry.

The purpose of the invention is to intensify heat transfer while improving the granulation of the calcined material by reducing the content of sand fractions of 0-3 mm.

The lining of the rotary kiln contains rows of refractory blocks covered with metal finned heat exchange sections, the sections being designed as an arcade, and the ribs are arranged diagonally in the section symmetrically in transverse rows and with a broken line in longitudinal rows.

FIG. 1 shows the masonry sweep of the proposed lining; figure 2 - refractory block, isometric.

The lining of the rotary kiln contains rows of refractory blocks 1, covered with metal heat transfer sections 2 with edge 3, which are fastened with bolts 4, while this section is made in the form of an arcade 5 containing a series of identical arches. The ribs are located along the diagonal of the section symmetrically in transverse (ring) rows of the lining of the lining and with the formation of a broken line in the longitudinal rows of the masonry.

The lining of the rotary kiln of refractory blocks with heat exchange metal sections with a rib operates as follows.

The edges of the lining sections pick up the material, lift it and stratify it over the arched-shaped working surface, after which it flows down from them, mixing evenly with all layers, and in adjacent rows of sections, laid respectively with the edges and opposite to each other, the edges provide New quality processing mix. This is due to the fact that the mixture falling between the ribs arranged according to this scheme, is subjected to a suspended-pulsating movement and advancement of the material, and also contributes to the outflow of the material when the furnace is rotated, not by a directed large jet, but separated by many arc-shaped flow layers.

Such processing of the material in the complex ensures the intensification of the process, the heating of the thermal parameters of the firing mode while improving the granulation of the charge.

The ribs on the basis of the metal sections, formed in the form of diagonal plates of a triangular shape, as well as the laying of the sections themselves in adjacent rows, respectively, with parallel and oppositely directed edges to each other, contribute to the fact that the lining functions as a heat suppression device.

The performance of the proposed lining in comparison with. known given in the table.

Indicators

Values for lining

proposed

famous

The surface area of the lining,%

122

100

five

0

Specific consumption of equivalent fuel per 1 ton of clinker in the furnace 5x185 m, m / t

The relative temperature of exhaust gases (average) in the furnace is 5x185 m, s

Content of clinker fraction 0-3 mm,% Ejection of material

5 into the gas flow,% Relative reliability coefficient (manufacturability, strength,

0 stiffness and durability)

118

260

12

221

295

sixteen

12

1.4

1.0

The use of the lining in a rotary cement kiln with a diameter of 5 m. And a length of 185 m provides an increase in the heat exchange surface by 22% compared to the known lining. reduction of specific consumption of equivalent fuel for burning 1 ton of clinker to the level of 118 kg / ton against 221 kg / ton, lower

The temperature of the gases leaving the furnace is up to against, a decrease in the content of sand fractions in the burnt clinker to the level of 8% versus 12%, an increase up to 40% in the operational reliability of the lining.

Claims (1)

Formula image shadows The lining of the rotary kiln containing a series of refractory blocks coated metal ribbed sections, characterized in that, in order to intensify the heat transfer while improving the granulation of the calcined material by reducing the content of sand fractions of 0-3 mm, the sections are made in the form of an arcade, and the edges are arranged diagonally on the section symmetrically in the transverse row and with the formation of a broken line in longitudinal rows. srig.1 FIG. g Compiled by V. Obraztsov Editor I. Gorn Tehred M. Khodanich Proofreader A.T. Order 3792/35 Circulation 542 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4