SU734291A1 - Air-heater of blast furnace - Google Patents

Description

one

The invention relates to the field of metallurgy, in particular to the structures of blast furnace stoves and can be applied in. of all sectors of the national economy where high-temperature gas heating is required.

The closest in technical essence and the achieved positive effect is a blast furnace stove containing a casing, a refractory lining, a dome, a nozzle chamber and a combustion chamber equipped with a system for supplying gas burners of stoves with air heated in air cooling pipes of a blast furnace, the system includes a group of fans, an air duct, laid down along one of the transverse axes of the floor, a group of parallel branch air ducts, and also a stake, Neva air duct for exhaust air to the gas burners ID.

A disadvantage of the known device is the low degree of reliability of operation when gas burners operate on a gas of low condensation,

increased metal consumption of the hot air supply path heated in the blast furnace area; underutilization of the space between the foundation and the bottom of the combustion chamber (from 8–14 m).

The aim of the invention is to eliminate the disadvantages of the known device, as well as to increase the efficiency of heating to blow when using low-calorie gases.

The goal is achieved by the fact that the lower part of the combustion chamber is provided with a lindric section with a diffuser installed in front of a gas burner, into which a supply of what air is connected coaxially, connected to a hot-blowing pipeline.

The supply of hot air is made in the form of a nozzle installed in a reinforced concrete cushion.

The invention is illustrated in drawing 25, which shows a vertical section through a general view of the stove.

The air heater consists of a chamber of the deposit 1 and a chamber of combustion 2, united by a common dome. The combustion chamber 2 is equipped with a fitting.

3 outputs of hot air blow into the hot air path 4 and a cylindrical section 5 with a diffuser b installed above the burner 7, made in the form of two concentric toroidal slots, through which ventilator 9 is installed separately by the socket 8, in which the air duct 9 is installed, and the branch pipe 10 gas is supplied from a pipeline 11, equipped with a regulator 12 and a gate 13. An additional supply 14 of hot air is coaxially inserted into the burner 7 in the form of a nozzle installed in a reinforced concrete pad connected with a lined sleeve 15 path 16 hot blast. Lined sleeve 15 is equipped with a reference gate 17.

The operation of the air heater is carried out as follows.

During the heating period, the nozzles from the pipeline 11 of low-calorie blast furnace gas. By means of the regulator 12, blast furnace gas is supplied, which is mixed with fan air before burning and supplied with fan 9 from the nozzle 8 and finally mixed after opening the slide 13 in the diffuser 6 and the cylindrical section 5 under pressure of 300-800 mm Hg

At this time, the gate 17 and a portion of the hot blow (the flow rate is controlled by the artificial lining pinch) from the hot path 16 or from the additional collector hot blow (not shown in the figure) through the lined sleeve 15 enters the nozzle. 14 with a pressure of 2-6 MPa and then falls into the cylindrical section 5 and the diffuser 6, injecting a mixture of air and blast furnace gas from the burner 7.

Conditional

air temperature

while at the exit of the nozzle 14 during the entire heating period it is maintained at 700-770s, which, with a calorific value of blast furnace gas equal to 850-900 kcal / Nm%, will provide a temperature under the dome of the air heater equal to 1500-1550 0 and, accordingly, the temperature of hot blow 1400 -1450 C.

 . The conditional temperature of air preheating is understood to be the temperature that is obtained by mixing hot blowing and fan air.

During the heating period, the air heated in the nozzle after opening the gate in the nozzle 3 of the hot blow outlet enters the path 4 of the hot blow and part of it can be directed through the nozzle 14 to the reading gate 17 into a separate collector (not shown in the figure) and from there goes for delivery to the air heater, which is on the heating of the nozzle through the SOP. SO 14 of this air heater.

The use of the technical solution will allow low-calorie gases to be used to heat the heaters, ensuring a rise in the temperature of the blow with an increase in the efficiency of its heating.

Indicative economic

the effect in relation to the block of air heaters for a blast furnace with a useful volume of 2000 m will be 700-800 thousand rubles. in year. .

Claims (2)

1. Air heater of a blast furnace containing dome, chamber a nozzle, a combustion chamber in which a hot exhaust pipe is blown and a gas burner with a supply of hot combustion air, characterized in that to increase heating efficiency when using low-calorific gases, the lower part of the combustion chamber is made in the form of a cylindrical section with a diffuser installed in front of a gas burner, into which hot air supply is coaxially inserted, connected by a pipeline to a hot-blowing path. 2. Air heater according to claim 1, characterized in that the supply of hot air is made in the form of a nozzle installed in a reinforced concrete cushion of the combustion chamber. Sources of information taken into account in the examination 1. The patent of the Federal Republic of Germany (1294399, class C 21 B 9/14, 1965.