SU777187A1 - Chimney stack - Google Patents

Description

combat and installed with an air gap, the latter is equipped with a reinforcement cage, and the thermo-acid-resistant coating is made with horizontal and vertical seams on the side facing the inside of the pipe, and with horizontal seams on the side facing the external trunk.

FIG. 1 shows the proposed chimney, longitudinal section; in fig. 2 - the same, cross section; in fig. 3 is a detail of a longitudinal section in FIG. one; in fig. 4 shows section A-A in FIG. 1 (detail of the diameter); in fig. 5 is a section BB in FIG. 1 (detail of the diameter).

The flue pipe is installed on foundation 1 and includes an outer barrel 2 and an inner exhaust pipe 3. The latter is equipped with a double reinforcement cage, the inner part of which 4 is continuous along the entire "height of the pipe" and the outer 5 is cut along the horizontal seams 6. Heat-resistant coating 7 the gas outlet barrel is made with horizontal 8 and vertical 9 temperature seams. Such a flue gas device is a self-supporting structure that can not only perform protective functions against the aggressive environment of flue gases, but also actively resist all design loads acting on the chimney, and are usually perceived by an external supporting barrel 2 pipe. In the construction of the pipe, the role of the outer casing is reduced only to the protection of the flue gas trunk from atmospheric and radiation effects, and therefore the outer casing can be made, for example, in the form of a solid heat-insulating slag wool layer 10 with a thickness of 0.01 m, an air gap 11 and an outer weatherproof casing 12, made, for example, in the form of closed ring sections, which are overlapped strung on. the lower section, and the upper part attached to the intermediate frame 13, such as aluminum, using well-known self-locking rivets 14. The frame 13 is attached to the inner barrel 3, for example, by zeroing the bases of the legs 15 of the frame to the inner exhaust pipe. The heat-acid-resistant coating of the internal gas exhaust trunk is made, for example, of silica concrete panels 16 having an armature 17, an armature outlet 18 and halves of the known Y-shaped thermo-acid-resistant compensator 19 inside, which are hermetically screwed around the perimeter of the panel from the side facing the concrete.

When designing a pipe to ensure the joint operation of reinforcement and concrete, on the basis of the existing legal provisions, the working reinforcement 4 is not allowed to exceed above 350 ° C, and the diameters of the armature 17 and the outlets 18 should not exceed 6-8 mm.

Concrete for the barrel 3 of the pipe must be heat-resistant with improved qualities of acid resistance, best of all with a known additive of 0.14-2.7 l / m of a 50% emulsion of alkylhydrosiloxane fluid, since, in addition to increasing the acid resistance of concrete and its workability, The fittings and all embedded metal parts, as well as the pores of the concrete, are covered with a thin protective thermo-acid-resistant film (burns out at 360 ° C). Smoke pipe works as follows. When the pipe is heated, the armature 17 and the arm outlet 18 of the silicon concrete panel 16 and the system of temperature joints 8 and 9, which allow the concrete to warm up from the inner surface to the working reinforcement 4 without cracking, are put into operation. Upon further heating of the barrel, it begins to grow upwards and expand, while due to the temperature difference across the thickness of the barrel wall, temperature joints 6 begin to work (annular cracks open where the reinforcement 5 is interrupted). When the pipe is cooled, its operation is similar, only reversed in the directions of the displacement

effort. In case of transverse bending of the pipe under the influence of wind loads and one-sided solar heating, the working reinforcement 4 enters the extended side of the pipe, and the living reinforcement on the compressed side

the cross section of the concrete from the inner surface to the beginning of the opening of the cracks in the horizontal joints 6, which, depending on the magnitude of the bending forces and the temperature of heating of the pipe, varies continuously.

The panels 16 of the heat-acid-resistant coating 7 are sized 0.75 x 1.25 x 0.04 m for the convenience of working with them, since they are used as opal shields and therefore should be minimal in weight. In the set of these shields, for the convenience of closing the formwork ring, additional panels should be produced simultaneously, for example, with dimensions of 0.35X 1.25X0.04 and 0.25X1.25X0.04. The pizhny limit of panel thickness can be taken 0.03 m, but this requires expert testing.

Thermal calculations show that for climatic zones with an estimated minimum temperature of -30 ° C thickness

The warming slag layer 10 is sufficient in 0.01 m. At the flue gas temperature of 125 ° C, the concrete under layer 10 will be heated to 20 ° C, while the temperature of the flue gases will decrease

gases up to 60 ° C, the temperature under the insulation will be 5 ° C; at a flue gas temperature of 250 ° C, the temperature under the insulation will be 100 ° C.

The invention reduces the volume

physical work, usually eliminate the concomitant division of types of work on the construction of a bearing reinforced concrete shaft and on the device in it of one or another type of flue gas trunk, which are equal in complexity, pipe costs, total cost and duration of work. With proper organization of work, it is possible to reduce the cost of building a pipe by half. It is known that the cost of construction of modern pipes with a height of 180 m averages 1 million rubles, 250 m - 2.2 million rubles, 320 m - 3.2 million rubles, 400 m - 4.8 million rubles .

Claims (2)

1. USSR author's certificate number 477229, cl. E 04H 12/28, 1975. 2. Type project No. TR-37086 “Pipe chimney prefabricated reinforced concrete H 45 m, DO 1.2 m for the boiler house NEC (Academy of Sciences of the USSR, Snegiri village, Moscow region). M., 1974. Have Jig