SU1298248A1 - Air heater - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used to heat the air blowing of blast furnaces. The purpose of the invention is to increase the service life of the air heater. The sub-columns in the upper part are made with nozzles, and in the lower part they are connected by channels communicating through the shut-off devices with the cold-blowing pipeline. The invention makes it possible to increase by a factor of 3 the service life of the air heater. 3 il. u x 00 nd 00

Description

The invention relates to ferrous metallurgy and can be used to heat the air blast of a blast furnace.

The purpose of the invention is to increase the service life of the air heater.

FIG. 1 shows the heater, a general view; in fig. 2 1I fig.Z - Uze

Section A-A in FIG. I in FIG. 1.

The heater contains a casing 1, a lining 2, a dome with a dome space 3. There are hatches 4 in the dome and nozzles for supplying combustion products 5 and withdrawing hot blowing 6. In the central part of the apparatus there is a nozzle chamber 7 with a fixed nozzle which lies on the grid 8, resting on hollow sub-columns 9. The latter are located in the sub-nozzle space 10, which is equipped with smoke exhaust pipes 11 and cold blowing 12. The cold supply pipe 12 is connected through a shut-off device 13 with pipe pipes gadfly 4 cold blowing. The internal cavities 5 of the sub-columns 9 in the upper part are provided with nozzles 16 extending through the grill 8 into the packing chamber 7, and in the lower part are connected by channels i 7, which are connected through pipelines 8-20 and shut-off devices to the cold-blowing pipe 14.

Such an embodiment of the air heater makes it possible to clean the nozzle from the plastic by conducting a mode of keeping the nozzle in a suspended state in parts when using existing blowing resources. This allows already after 5-8 hours to reduce the hydraulic resistance of the nozzle by 70-90% (compared with clogged) and prevents the need to change the nozzle, which increases the service life of the air heater.

The air heater works as follows on a 3-ohm borax.

In normal cycling operation, the heater 7 of the heater 7 is in a stationary (stationary) state. During the heating period, the combustion products through the nozzle 5 enter the dome space 3 and into the packing chamber, heating the packing 7. From the packing chamber, the cooled combustion pro- cesses flow into the packing space 10, from where

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through the pipes 11 of the drainage pipe - into the smoke flue. During the period a cold blast is blown from the conduit 14 through the locking device 13 and the nozzle 12 enters the sub-nozzle 10 and into the nozzle with nozzle 7, where it is heated. Further, the heated blast through the domed space 3 and the branch pipe 6 of the hot blowing outlet is supplied to the consumer, for example, into a blast furnace.

After a certain number of cycles of heating and cooling of the nozzle due to the accumulation of dust on it, the hydraulic resistance of the nozzle reaches an unacceptable level (increases approximately 1.5-2.0 times). Then, the nozzle is cooled with a flow rate blowing, ensuring that its particles are in a suspended state (fluidized bed). For this, a cold blast from conduit 14 is supplied through conduits 18-20.

5 with shut-off devices 21-23 (either simultaneously through all the pipelines or separately, depending on the flow rate of cold blowing required for weighing the particles

Q nozzles) and channels 17 into the internal cavities 15 of the sub-nozzle columns 9, from where cold blast through nozzles 1 b enters the nozzle with nozzle 7, weighing it. During this period, the particles of the packed material that are intensively rubbing against each other are cleaned of dust adhering to them. Next, blowing through the domed space 3 is located in hatches 4 located in the dome so that the dust from the nozzle does not reach the consumer. After 5-8 hours of operation of the heater in this mode, the hydraulic resistance of the nozzle (in a fixed

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the steady state is reduced by 70-90% and the stove is switched to the original cyclic heating and cooling of the nozzle.

Such an air heater can significantly (three times) increase its service life. This prevents the need to change the nozzle, which increases the service life of the heater to 6-8 years.

Claims (1)

Invention Formula Air heater containing casing with lining, podsquiet space with manholes and nozzles for supplying combustion products w discharging hot to blow, packing nozzle with bulk nozzle lying on the grate supported on hollow sub-nozzle columns which are located in the sub nozzle space into which the nozzles are built removal of smoke and cold water blowing under, distinguish 2982484 In order to increase the service life of the stove, the sub-nozzle columns in the upper part are made with nozzles leading 5 into the nozzle chamber, and in the lower part they are connected by channels communicated through the shut-off devices to the cold-blowing pipeline. u FIG. ; v Compiled by A. Ashikhin Editor N. Rogulich Tehred A. Kravchuk Proofreader I. Erdeyi Order 861/26 Edition 550 Subscription VNSHSHI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fig.Z