SU1759919A1 - Conveyor-type annealing machine - Google Patents

Abstract

Use: preparation of raw materials in the steel industry. The roasting machine, containing the drying, heating, roasting and cooling sections, heating and gas-fired hearths and connecting paths, through which the inlet pipes of the drying and heating zone are connected to the last cooling section, is equipped with a fuel-burning device installed in the gas-flue hearth of the last cooling section. In this case, the fuel-burning device uses atmospheric air as combustion air, and exhaust gases as dilution air. As a result, at the last stage, a heat carrier with a temperature of 300-400 ° C is formed, which is fed into the drying and heating furnaces, which allows to increase the productivity of the machine. 1 il.

Description

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The invention relates to the production of iron ore in ferrous metallurgy, namely to the design of calcining equipment for the production of agglomerated materials.

Calcined conveyor machines for the production of pellets are known, including stepped sections of drying, heating, roasting and cooling with heating and gas fired hearths, with nozzles and connecting paths.

The disadvantage of these machines is the lack of systems for the use (recirculation) of low-temperature flue gases (110–200 ° C) and systems for forming a coolant for the drying and heating sections.

The coolant at the entrance to the layer has an uneven and uncontrolled temperature potential and either degrades the quality of the finished product or lowers the productivity of the firing equipment.

The projected prototype of the roasting conveyor machine, consisting of drying, heating, roasting and cooling sections, heating and gas-fired furnaces and connecting ducts, by means of which the inlet pipes of the% i preheating zone are connected to the last cooling section.

The disadvantages of this design are recirculation of waste gases from high-temperature zones (drying and heating), in these zones nitrogen oxides, sometimes sulfur, and also dust are always contained; uneven distribution of heat over the surface of the materials of the drying and heating section; increased heat loss with flue gases,

The aim of the invention is to increase the productivity of the machine.

To do this, in a calcining conveyor machine, containing sections for drying, heating and cooling, heating and

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gas conduits and connecting paths, through which the inlet pipes of the drying and heating zone are connected to the last cooling section, a fuel-burning device is installed in the flue gas furnace.

The drawing is a schematic diagram of the calcining conveyor machine with a system for recirculating low-temperature waste gases.

The machine consists of drying sections 1, heating 2, firing 3, cooling A with heating 5 and gas-fired furnace and connecting paths. The horn of the last stage of the cooling section 4 is equipped with fuel-burning devices 7 and is connected by a path 8 to the mountain sections of the 1 and 2 sections for drying and heating.

Fuel-burning devices 7 use atmospheric air as combustion air and exhaust gases as dilution air. As a result, a coolant with a temperature of 300–400 ° C is formed at the last stage of the cooling section, which is sufficient for the drying section and as air dilution for the heating section.

Conveyor machine works as follows.

The pellets are loaded onto a conveyor grid and successively dried, heated, fired and cooled in sections 1-4. At the last cooling stage, the pellets are cooled with air that is filtered from bottom to top. In the upstream flow of exhaust gas (cooling agent) in the flare created by the combustion unit 7, the fuel-air mixture is burned. The products of combustion are mixed with a cooling agent and the resulting coolant along the path 8 is fed to the mountains for drying and heating. After cooling, the pellets are sent to the finished product warehouse.

The application of the invention provides a reduction in the specific fuel consumption and an increase in the productivity of the calcining conveyor machine.

F o rm u l i z o bre fiing and baking conveyor machine, containing drying, heating, burning and cooling sections, heating and flue gas chambers and connecting ducts, through which the inlet pipes of the drying and heating zone are connected to the latter a cooling section, characterized in that, in order to increase the productivity of the machine, it is equipped with a fuel-burning device installed in a gas-fired furnace of the last cooling section.

Claims (1)

Claim A firing conveyor machine containing drying, heating, firing and cooling sections, heating and gas furnaces and connecting paths, through which the inlet pipes of the drying and heating zone are connected to the last cooling section, characterized in that, in order to increase the productivity of the machine, it is equipped with a fuel burning a device installed in the gas chimney of the last cooling section.