SU1749671A1 - Metal heating furnace - Google Patents

Abstract

SUMMARY OF THE INVENTION: An oven containing a housing, a working chamber formed by the vault, hearth and walls with air preheaters is divided into a non-oxidative heating zone with burners and a afterburning zone, above which the intermediate vault and smoke outlet are located. To increase the efficiency, the furnace is equipped with an additional arch located above the intermediate arch and consisting of a series of metal cooled sections installed with a gap for the passage of flue gases, and the intermediate arch is made in the form of a series of perforated secondary air ducts alternating with metal sections adjacent to them mi to produce a steam mixture. In this case, the metal cooled sections of the additional arch are made V-shaped.

Description

The invention relates to metallurgy and mechanical engineering, namely to the heating and heat treatment of metal.

A known furnace comprising a preheating zone, a rapid heating zone, also an intermediate zone; as well as a furnace for direct non-oxidative heating, a device for incomplete combustion of fuel and a zone for heating metal products to high temperatures.

The main disadvantages of these furnaces are their low efficiency, as well as their inadequacy for the production of hot water or steam.

Also known is a furnace 1, equipped with additional air heaters and adjustable blades that form nozzles for supplying secondary air, an intermediate arch located above the afterburning area, made in the form of a series of hollow metal hollow sections with gaps between them.

The disadvantages of this furnace are the difficulty of controlling air blades and the lack of direct high-temperature radiant heat exchange from the gas curtain to the metal surfaces of air-water tanks.

The purpose of the invention is to increase the efficiency of the furnace.

To do this, they provide conditions for efficient combustion of the fuel with adjustable temperature in three layers of x steps, high, medium and slow heating in the furnace volume provided that the metal is not oxidatively heated in a wide range of variation in the air flow rate and that the metals are heat treated within wide temperature limits. air ducts for high-temperature heating of secondary air and steam medium on one side protects metal surfaces from contact with gas curtains and howl

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Efficient fuel combustion is promoted by intensive mixing of the flare with secondary air in three stages. Uniform distribution of the combustion products in the gas ducts of the intersectional additional vaults ensures maximum utilization of the heat of the combustion products. In addition, economical consumption of fuel resources contributes to the creation of waste-free technology.

On the proposed furnace, a general view (one metal cooled section of the additional arch is shown, having a V-shape;

The furnace for heating and heat treating metals contains side injection burners 1, a non-oxidizing heating and heat treatment zone 2, for example, with three geometrical shapes of the products being processed 3 above the bottom 4, a high-temperature gas curtain 5 under high air pressure, and also the middle 6 and low 7 air curtains corresponding to medium and low air pressures, high-temperature air ducts 8 intermediate dome with three rows of outgoing air flow, side air heaters 9 built in the walls of the furnace, steam duct elements of the 10th arch, tight

mounted with air ducts, the intermediate gas distribution zone 11 between the two arches, the side walls of the furnace 12, the metal cooled sections 13 of the additional arch with the gaps 14 between the sections and above them are the collecting duct 15.

Claims (2)

1. Furnace for heating metal, containing a casing, a working chamber formed by the roof, hearth and furnace walls with air heaters, divided into a non-oxidizing heating zone with burners and a afterburning zone, over which the intermediate roof and the smoke outlet are located. that, in order to increase efficiency, it is equipped with an additional vault located above the intermediate seode and made of metal cooled sections installed with a gap between them for the passage of flue gases, and the intermediate vault is In the form of a series of perforated secondary air ducts installed with a gap and metal sections housed in the gaps to obtain a water-vapor mixture. 2. Furnace according to claim 1, characterized in that the metal cooled sections of the additional arch are made V-shaped. 777JJ