SU432321A1 - FURNACE FOR HEATING SILES - Google Patents

Description

The invention relates to the field of metallurgy, in particular, to devices for thermal conditioning of charge materials that are not normally supplied to furnaces used, for example, in the production of ferromanganese.

A known furnace for preheating the mixture with furnace gases, including a shaft, a chamber of the fluidized bed, burners, loading and unloading devices.

The disadvantages of the known furnace are the large dust removal with leaving gases, low heat exchange and insufficient heating of the charge particles.

In order to selectively heat simultaneously small II coarse fractions of the charge and their subsequent, its mix, the proposed furnace is made with separate loading of the coarse and fine fractions of the charge: coarse - into the shaft, fine - into the fluidized bed chamber. The peculiarity of the furnace is that the boiling bed chamber is fenced with louvred grilles forming a slotted shaft, which is provided with a hopper in the lower part of the common bed of the boiling bed, and gas burners are installed above the bottom of the boiling bed chamber.

FIG. 1 shows the proposed furnace, longitudinal section; in fig. 2 - the same furnace, cross section.

The furnace contains a bunker / for lumps and a slit shaft 2, formed by the pipes of the inner 3 and the broken 4 skeleton with louvered grilles 5. In the lower part of the slit rotary there is a bunker 6 for the hot charge.

The fluid bed chamber 7 is provided with a vault 8, a hearth 9, a charging device 10 and gas burners // to maintain the required temperature conditions in the furnace. Below the hearth is a furnace 12 for burning furnace gas, separated from the bunker by a lower vault / 5.

To transfer the fine fraction of the charge from the boiling chamber to the hopper, the channels 14 are made. A gas chamber 15 is located in the upper part of the frame.

The furnace works as follows.

The coarse fractions of chemical materials fill the bunker / n slit hatch 2, forming a slowly descending blown layer. The small fractions of the charge are fed through the charging device W to the bottom 9 of the fluidized bed chamber 7.

Gases from the fluidized bed chamber pass through a layer of lumpy charge filling the slit shaft and then under the action of discharge enter the gas chamber 15, change their direction, are filtered through the layer of material in the upper part of the slit shaft and go to the gas outlet .

In the case of double filtration of gases through the charge layer, the gases heat large pieces of the charge and this is dedusted. The components of the charge materials are small PTs of the "fluidized bed" chamber through the flow channels 14, and the large ones from the slot-hole, heated to the required temperature, are continuously fed into the hopper 6, where they are mixed before being fed to the furnace.

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Subject invention

A furnace for heating the charge, including a shaft, a chamber of the fluidized bed, burners, loading and unloading devices, characterized in that, in order to selectively heat both small and large fractions of the charge and their subsequent displacement, the chamber of the fluidized bed is fenced with louvres forming a slit shaft, provided in the lower part with a bunker common with the fluidized bed chamber, with the burners mounted above the hem of the fluidized bed chamber.

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