SU1257110A1 - Method of heating recovery soaking pits - Google Patents

Description

The invention relates to methods for heating heating wells and can be used in metallurgical and other industrial sectors.

The aim of the invention is to increase the durability of wells, increase productivity and snuff metal burn.

The drawing shows devices for the implementation of the proposed method.

Supply and incineration of blast furnace and natural gas production: separate

The supply of natural gas to the supra-air space of the air regenerator at an angle of 35-60 provides conditions for the active mixing and cross-linking of natural gas with air.

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At a feed angle of less than 35, the gas and air are weakly mixed and the transfer process does not end in the air jet regenerator's overpackage. At a feed angle of more than 60, it is possible to create a hydraulic shutter for air flow.

The efficiency of the selected interval in the angle of the natural gas supply was confirmed experimentally. As a determining parameter, the specific fuel consumption for heating the metal was chosen, which was 40, Oj 38.3; 38.1j 37 and 48 kg / t, respectively, at the angle of supply of natural gas 25, 35, 45, 60 and 70 °. .

Natural gas in the supernatant space of the air regenerator is mixed and burned with all the exhaust air and air (air is supplied in an amount necessary for the combustion of both natural and blast furnace gases).

As a result, D1) is formed. 1 air mixture containing an oxidizing agent in an amount sufficient to subsequently burn the blast furnace gas. The resulting air / smoke mixture has an increased temperature and rate of

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15

25

thirty

 35

. 40 45

50

55,

the movement of motion (as compared with air by a known method), as a result of which active mixing of the blast-furnace gas with the oxidizer with the formation of a torch, the length of which does not exceed the length of the working chamber of the well, occurs in the supernatant space of the gas regenerator,

This method of heating regenerative heating wells allows eliminating natural gas B emissions from the atmosphere, intensifying the mixing of blast furnace gas with an oxidizer, and reducing the length of the flare and, as a result, increasing the durability of the regenerators, since there is no burnout of fuel in the nozzles. With a Flare Length not exceeding the length of the well chamber, the thermal gap in the well chamber and the temperature are increased, which leads to a reduction in the heating time of the metal, and consequently, to a reduction in the metal burnout and an increase in the productivity of the well. This also contributes to the absence of loss of natural gas emissions - in the atmosphere.

After the metal is planted into the working chamber 1, when heating the licorice on the left, gas is supplied through the burner 2, and through gas 3 and air 4 regenerators, respectively, blast furnace gas and ventilator air in an amount sufficient to burn natural and gases, Natural gas from the burner enters the supernatant space 5 at an angle of 35-60 ° to the air flow, exhausted from the air

regenerator 4, mixed with it and burned. The smoke-air mixture formed from the combustion of natural gas, which has a sufficiently high temperature and speed, enters the transfer space 6, where the blast furnace gas from the regenerator 3 also runs out with increased orbital flow. the smoke-air mixture in the supernatant space 6 is trx active mixing with the formation of a turbulent plume, the length of which does not exceed the length of the working chamber of the well. The products of combustion, giving up their heat to the metal in the working chamber, are removed through opposite supra-filling spaces 7, 8, gas and air regenerators 9, 10. When the well is heated, the natural

3125 l

gas is supplied through the burner 11, blast furnace gas and air, respectively, via regenerators 9 and 10, and the direction of movement of the flame and combustion products are reversed. five

An example. 6 ingots weighing 8 tons each, with an ambient temperature of 20 s, are planted in a regenerative heating well chamber of dimensions 4000x2200x3140 mm in a chamber of 4000x2200 mm. The ingots are heated with O to a surface temperature of 1310 C at the control temperature in the chamber. For heating - 3800 m / h of blast furnace gas are supplied through the gas regenerator, and through the mountain device into the air space of the air regenerator - 120 m / h of natural gas. The air required for burning the blast furnace and natural gases is supplied through air reclamation.

Total heating time, h-min

Time to exit to control

temperature 1360 ° C, h-min

Productivity, t / h

CO content in DMA over

opposite nozzles

Surface condition

ingots.

The total heating time of the cold metal is reduced from 5 h 40 min to 5 h 5 min, the well productivity increases by 11%, burnout. fuel - in opposite nozzles of regenerators (about this evidence

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nerator in the amount of 4150 m / h. Natural gas is fed at an angle of 45 ° to the air stream flowing into the supra-nasal space from the air regenerator. In the supra-air space of the air regenerator, natural gas is burned with all the air flowing out here. The flue-air mixture formed from the combustion of natural gas enters the supra-nasal space of a gas regenerator, where blast-furnace gas is burned to form a flare, the length of which does not exceed the length of the well chamber.

The table shows the comparative data of the proposed and known methods of heating, performed in comparable conditions.

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There is a sharp decrease in the GO content in the waste products of combustion taken over the opposite nozzles). Melting of the metal surface, and hence the waste of the metal, is reduced.

Editor H, Shvydka

Compiled by V. Berbenev

Tehred I.Popovich Proofreader V. Sinitska

Order 4883/21 Circulation 552Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (2)

1 . METHOD FOR HEATING REGENERATIVE HEATING WELLS, which includes supplying and burning natural and blast furnace gases in them, characterized in that, in order to increase the durability of wells, increase productivity and reduce metal waste, natural gas is burned with excess air in the nozzle space of the air regenerator, and blast furnace gas is burned in a smoke-air mixture formed from the combustion of natural gas. 2. The method of pop. 1, characterized in that the natural _gas is fed at an angle of 35-60 to the direction S ^ NIJ air flow. SU „„ 1257110