SU1216608A1 - Arch roof of tunnel furnace - Google Patents

Description

The invention relates to the design of furnaces for heating and heat treating products at high temperatures and can be used in factories in metallurgy and mechanical engineering.

The purpose of the invention is to increase the resistance of the arch.

Increasing the durability of the vaults makes it possible to extend the turnaround time between furnaces, which will ensure a reduction in the cost of products 11: and

FIG. 1 shows the tunnel vaults, general view; with partial cut; FIG. 2 is a section A-A in FIG. 1, in FIG. 3 is a section BB in FIG. 2,

The vault contains arched masonry 1 made of refractory bricks, installed on refractory parabolic bricks 2 longitudinally placed on both sides, and heat insulated cyoin layer 3, located on arched masonry 1. Along the arch, there are infrared beams 4 with niches 5 in them which are enclosed refractory ptovye bricks. Pto beams are interconnected by transverse metal arcs 1% 1 by ribs 6 so that they pass through the entire heat insulating (1 layer and protrude above it. Longitudinal strips 7 are rigidly attached to the upper ends of the arches, to which with pins 8 with nuts 9, arc-shaped support strips 10 are suspended and bricks of the heat-insulating layer are laid on them. Support strips 11 are also welded to the bottom ends of the ribs with a configuration corresponding to the bow-shaped support strips. The distance between the arc-shaped strips sets c in the range of 0.7–0.9 in the length of a brick made of thermally insulating material.

When reducing the distance below the lower limit, the design is strongly relaxed and installation is difficult.

16608

 bricks. When uhnegachenii distance more than the upper limit becomes problematic stability of bricks on the strips, f.e. 5 the number of failures of bricks from the thermal insulation and the ionic layer downwards increases.

The structure of the floating beams 4 can be made in the form of hermetic

JQ cavities with convective surfaces: for heating the blast air. For this cavity, beams 4 must be communicated on one side with the air supply system, and on the other hand, with furnace burners ..

During the operation of the tunnel furnace under the influence of high temperatures, which also have large temporary differences, in the design

JQ fornixs tensile and compressive forces occur. The stresses arising in the arched masonry 1 are transmitted through the floating bricks to the metal structure of the beam beams with arc-like different ribs, which hold the arched masonry 1 under constant compressive force. At the same time, arcuate ribs ensure the removal of both excessive destructive forces in the arched masonry and, during cooling, they compress it and return the cement bricks 2 to the initial position.

In addition, the supporting arcuate 5 sa ensures that the heat insulating layer is laid on them. Thus, the thermal insulation layer hangs with a gap above the arched wall, which removes the .Q effect of its weight on the arched wall, increasing its durability.

The application of the proposed arch in tunnel kilns will increase the resistance of the arched masonry, increase J ,. the service life of the vault as a whole, reduce the cost of repairs, and consequently, reduce the cost of production processed in these furnaces.

thirty

FIG. 2

eight

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Editor E. Papp

Compiled by V.S. Darnov

Tehred A.Ach. Proofreader S. Shekmar

991/49 Circulation 561 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Fig.Z

Claims (2)

1. ARCH Vault OF THE TUNNEL FURNACE, containing two-layer masonry of refractory and heat-insulating brick layers, heel beams and traction bricks, characterized in that, in order to increase durability, the arch is provided with metal transverse 2k arcuate ribs, rigidly fixed by the ends on the beams and located in the heat-insulating layer, and metal structures for suspending the heat-insulating layer to arcuate ribs, made in the form of longitudinal straight and transverse arcuate strips connected by rods, while longitudinal strips are fixed on arcuate ribs, and transverse by means of rods suspended from them. 2. Code 1, characterized in that the distance between the arcuate strips is 0.7-0.9 of the length of the brick of the insulating layer, and the layer itself is placed. on these strips in layers with the formation of a gap between them. SU „..1216608 FIG. 1> ί