RU1808020C - Method for cooling metalworks of travelling sinter machine - Google Patents

Abstract

Usage: in the field of iron ore production in metallurgy. Essence: a method of cooling a steel structure of a sinter machine of a conveyor type consists in cooling the bearing longitudinal beams of a hearth with air, which is fed into the beams under a pressure of 1800-3000 Pa in an amount of 350-450 m / m of the area of the conveyor belt located under the mountain and directed from the beams to the side sides separate, located in a line with a frequency of 9-13 u / m length of the hearth, with jets at a speed of 50-80 m / m2 with the creation of an aerodynamic curtain between the beams and the sides.

Description

The invention relates to the production of non-raw materials in metallurgy, in particular to the production of sinter.

This invention is directed to increasing the productivity of sintering machines, increasing the durability of their equipment. A method for cooling metal structures of conveyor-type sinter machines includes cooling the supporting longitudinal beams of a hearth and metal structures of a conveyor belt. According to the invention, the longitudinal beams are cooled by air, which is supplied to them under a pressure of 1800-3000 Pa in an amount of 350-450 m / m of the area of the conveyor belt underneath the mountain and is directed separately from the beams towards the sides, in a line with a frequency of 9- 13 u / m length of the hearth, with jets at a speed of 50-80 m3 / m2 with the creation of between beams and sides of the aerodynamic curtain.

The aerodynamic curtain between the longitudinal beams and sides is installed as follows.

Agglomeration charge is immersed on a conveyor belt and subsequently subjected to ignition and sintering. In the incendiary furnace, the air-fuel mixture is burned, a coolant with a temperature of 1200 ° C is formed and filtered through a charge layer located on the sintering trolleys. Cold air is supplied to the longitudinal bearing beams of the hearth through the nozzle at a pressure of 2200 Pa, in an amount of 400 m / m2 of the cooling area of the sides, i.e. the area under the mountain sides of the conveyor belt. This air cools the beams and through the nozzles is directed to the sides

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sintering trolleys. Air is supplied from the beams at a speed of 65 m3 / m2 s in the form of separate jets located in a line at a frequency of 11 u / m length of the hearth. As a result, reliable cooling of the longitudinal load-bearing beams and sides of the sintering carts is provided with the installation of a protective aerodynamic curtain between them.

Air is supplied to the longitudinal beams under a pressure of 1800-3000 Pa. When air is supplied with lower pressure, due to the reduced speeds of the cooling air jets directed towards the sides of the bogies, the resistance of the latter decreases. When air is supplied with high pressure, without increasing the reliability of the cooling system, the energy costs of redistribution increase, the requirement for tightness of equipment increases, and, as a result, its durability decreases.

Air is supplied to the longitudinal beams in an amount of 350-450 m3 / m2 of the area below the mountain sides. When less air is supplied to the beams due to insufficient cooling of the sides, their durability decreases. When more air is supplied to the longitudinal beams, the cooling efficiency of the sides does not increase anymore, and the energy costs of redistribution increase, and the utilization rate of used equipment decreases.

Air is supplied from the longitudinal beams to the sides of the conveyor belt at a speed of 50-80 m3 / m2 s. At a lower speed of air supply to the sides, due to a decrease in the heat transfer rate, the cooling efficiency of the sides of the bogies and their durability are reduced. At higher air velocity on the sides, the efficiency

their cooling is no longer increasing, and the energy costs of redistribution and requirements for tightness of equipment are increasing.

Air supply from the longitudinal beams to the sides of the bogies is carried out in the form of separate jets located in the amount of 9-13 u / m length of the hearth. With a smaller number of jets in the line, the uniformity of the airflow of the sides and, as a consequence, their durability are reduced. With a larger number of jets in the line, the uniformity of the airflow on the sides does not increase anymore, and the mechanical resistance of the bearing longitudinal beams decreases noticeably. As a result, the utilization of the equipment and the productivity of the sintering machine are reduced.

The application of the invention ensures the performance of sintering machines, increasing the durability of the metal structures of the incendiary furnace and sintering carts and reducing energy costs for redistribution.

Formulas of the invention

A method of cooling a metal structure of a sinter machine of a conveyor type, comprising cooling a bearing longitudinal beams of a hearth, metal structures of a conveyor belt, characterized in that, in order to increase the productivity of the machine and increase the stability of the equipment, the longitudinal beams are cooled by air, which is supplied to the beams under a pressure of 1800-3000 Pa in an amount 350–5,450 m / m of the area of the conveyor belt beneath the mountain and is directed from the beams to the sides of the beams separate, located in a line with a frequency of 9–13 units / m of the length of the furnace 0 at a rate of 50-80 m / m2 with the establishment between the beams and the wind curtain sides.

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