SU983426A1 - Wall lining of furnaces with interior recuperation - Google Patents

Description

(54) LIGHTING OF FURNACE WALLS WITH INTERNAL RECOVERY

Claims (2)

The invention relates to the section of heating devices of metallurgical heat engineering n; It can be used in heating and thermal furnaces of the metallurgical and machine-building plants. The known lining of the walls of furnaces with internal heat recovery contains an internal porous layer (the outer impermeable layer permeable to combustion products and the combined smoke collector located between them, which runs along the entire perimeter of the furnace and has a height equal to the height of the walls of working chamber 13. The main disadvantages of this lining design are due to the fact that it can only be used in furnaces operating on a well-cleaned gas and having a small working chamber height, since the strength of the porous layer is low. sShbolee close to the proposed technical essence is known lining the inner walls of furnaces with heat recovery, with. Keeping the impermeable and permeable outer layers wherein the inner layer is made of individual bricks having through holes 2. However, in the known lining it is not possible to provide the necessary strength of the perforated layer; This is especially noticeable in batch furnaces, in which this layer is subject to frequent thermal stresses, and in blacksmith production furnaces that experience vibration from the forging equipment. The destruction of the perforated layer leads to the exit of the furnace out of operation. The aim of the invention is to increase the durability of the lining and reduce the capital costs of furnaces with internal heat recovery. The goal is achieved by the fact that in the lining of furnace walls with internal heat recovery, containing an outer impermeable thermal insulation layer, an inner refractory permeable layer made of separate perforated bricks laid on a rib in rows in a checkerboard pattern and a smoke collector located between the staples , between the ends of adjacent perforated bricks of each row and perpendicular to the inner perimeter of the layer, bricks were fixed, fixed in the outer impermeable layer “In FIG. 1 Lined walls in the front, a general view, in FIG. 2 the same, side view; section A-A in FIG. 1; in fig. 3 - the same, top view, section. B.-B in FIG. 1. The lining of the walls of the furnace with internal heat recovery consists of an outer impermeable layer 1, made of a small amount of thermal insulation material, an inner permeable layer 2 made of perforated refractory bricks 3, stacked in chess pieces and having holes 4 for removal of the product of combustion from the working chamber of the furnace, brick 5, installed between the ends of the adjacent perforated bricks of each row and connecting the outer impermeable layer with the inner permeable layer, prefabricated smoke collector b ,, connected to the smoke channel 7. During the operation of the furnace, the combustion products are sucked out from the working chamber through the holes 4, enter the bleed collector 6 and further into the smoke channel 7. Due to the discharge of the combustion products, the efficiency and degree of dryness increase and the surface temperature of the internal permeable layer 2, which leads to a significant intensification of heat transfer in the working chamber of the furnace. However, the efficiency of use of furnaces with internal recovery is fully determined by the resistance of the inner. Permeable layer of wall lining. It is precisely the unreliability of the wall lining that currently hinders the wider introduction of high-efficiency furnaces with internal heat recovery. The efficiency and reliability of the proposed lining of the wall lining is ensured by the fact that each perforated brick 3 of the inner permeable layer is installed between four bricks 5 rigidly mounted into the outer layer 1, which has high strength. Thus, the entire inner permeable layer, consisting of perforated bricks, becomes rigidly connected with the outer layer, which ensures the grab strength of the entire lining yt. This lining was tested on the firing stand of the roll-out furnace of the thin sheet rolling shop. The fire stand has a working chamber size of 1600 x 800 x 600 mm and is equipped with two G1Sh-8 burners operating on natural gas. During the study of the thermal work of the stand, the temperature of the floor in the lining of the walls in stationary and non-stationary thermal conditions is determined. After 8 months No visible damage to the lining of the walls and the inner permeable layer was found. The surface temperature of the inner permeable layer, depending on the heat load and the size of the heat circuit, varies in the range of 870–1175 ° C. The economic effect is determined by the reduction in capital costs and the cost of making bricks. Thus, for a furnace having a working chamber size of 7.5 2.5 2.5 m, a 25% reduction in capital expenditures is 37.5 J 0.25 9375 rubles. Reducing the cost of manufacturing perforated bricks - 12.0 X 280 rubles. 3360 rubles. Thus, when implementing the proposed technical solution, an economic effect of 12735 rubles can be obtained. Invention Lining the walls of furnaces with internal heat recovery, supporting an external impermeable layer, an internal permeable refractory layer, made of separate perforated bricks, riddled on a rib in rows in a checkerboard pattern, and placed between layers of a composite dam- the fact that, in order to increase stability and reduce capital costs, bricks are installed between the ends of adjacent perforated bricks of each row perpendicular to the inner permeable layer nye in outer impermeable layer information sources, the received note in the examination 1.Glinkov MA, Glinka GM General theory of furnaces. M., Metallurgists, 1979, p. 248, p. 79. 2, USSR Author's Certificate for Application No. 2945122/02, cl. f 27 and 1/00, 1980. L Jl b Fig.G