SU578353A1 - Device for evaporative cooling of holding furnaces - Google Patents

Description

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The invention relates to installations for the evaporative cooling of structural elements of methodical furnaces and can be used at the plants of the metallurgical industry.

A device for evaporative cooling of methodical furnaces is known, which includes a drum separator connected by lowering and lifting headers and a piping system with heat-absorbing screens installed in the flue gas duct and horizontally placed cooled structural elements of the furnace 1.

However, such an installation does not provide stable natural circulation in the horizontal elements of the furnace structure, for example, in bottom pipes, while reducing the heat load of the furnace. In this case, separation of the steam-and-water mixture occurs, which disrupts its natural circulation and may cause the burning of cooled bottom pipes.

Also known is an installation for evaporative cooling of sintering furnaces, which has the same disadvantages. This is due to the inefficient operation of heat-receiving screens, which do not ensure reliable circulation of the steam-water mixture under reduced thermal conditions of the furnace 2.

The purpose of the invention is to provide stable natural circulation in horizontally arranged cooled elements of the furnace design.

This is achieved by the fact that the lifting collector of the heat sprinkling screens is connected to the lifting collector of horizontally arranged cooled elements directly in front of the drum separator. At this point in the lifting manifold of the contour of horizontal cooled elements, the flow rate of the circulating steam mixture is maximum, so connecting at this point of the heat-absorbing shields ensures a steady natural circulation.

FIG. 1 shows a methodical heating gap with a proposed evaporative cooling device; in fig. 2 - smoke exhaust path with heat-absorbing screens installed in it, section.

A device for evaporative cooling of a methodic furnace includes a drum separator I, connected by downstream 2, 3 and lifting 4, 5 manifolds and a piping system 6 with heat-receiving screens 7 installed in the chimney tract 8, and horizontally disposed cooled structural elements of the furnace, such as bottom pipes 9.

The device works as follows.

From the drum-separator 1, water through the descending headers 2 and 3 gets into the structural element of the furnace and heat-absorbing screens 7, where it evaporates, extracts heat from the walls of these elements, cools them and forms a vapor-water mixture that circulates in each specified circuit. By lifting 4 n 5 collectors, mix the mixture back to the drum separator I.

If the furnace temperature is lowered, natural circulation may be interrupted due to a decrease in the moving head in the system. The connection of the collector of heat-receiving screens to the contour of horizontally located cooled elements directly in front of the separator drum leads to an intensification of circulation in this contour.

Ф о р м - л а and 3 o b e te n u

An apparatus for cooling nspariteliogo metodicheeknh neche, soda |) zhan1, its drum separator soednneppy Sliding and lifting system trubonrovodov collectors and with teilovosnrini.mayuiimi screens installed in the chimney present tract and horizontally arranged furnace cooled elements, characterized in that, with in order to ensure stable natural circulation in the horizontally located cooled elements of the furnace, the lift collector of the screen-mounting screens is connected to the horizon lifting collector flaxen cooled components directly in front of the drum senator.

Information sources taken into account

1. Use of secondary energy resources and cooling units in the ferrous metallurgy. You 1, M., 1972, p. .

2. USSR author's certificate .fb268599, cl. G-2713 3 / 2G, 1968.