SU1413390A1 - Method of reburning blast cupola gases in cupola tube - Google Patents

Abstract

The invention relates to the field of foundry. The purpose of the invention is to increase the efficiency of afterburning. The torches of the burners 3, working on natural gas, are fed in opposite from different sides of the charging port 2 and twist mutually opposite, set fire to the mixture of cupola cup and air. Hot cupola gases passing through the tube 1 of the cupola are emitted into the atmosphere with a carbon monoxide content of 0.1-0.2% by volume. The torches of the burners 3 are concentrators and stabilizers for the combustion of a mixture of cupola gases with air. The efficiency of the afterburning process is increased to 99.7% due to the deeper penetration of the rigid swirling torches of the burners into the zone most prepared for igniting the mixture of cupola gases with air. 2 Il. O) e

Description

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This invention relates to cupola melting and can be used in a foundry.

The purpose of the invention is to increase the efficiency of afterburning.

1 shows a schematic of a portion of a cupola with a charging port in FIG. 2, a section A-A in FIG. 1;

The cupola, on which the proposed method is implemented, contains pipe 1 with a top-down window 2 and burners 3 arranged on its sides.

The process of post-combustion of the cupola gases is carried out as follows.

When the iron is smelted in the cupola, cupola gases containing harmful components are released. The fugitive gases exit from the batch at the level of the lower cut of the charging port 2, contains, vol,%: carbon monoxide up to 22, oxygen up to 1.5, carbon dioxide up to 13 and oxides of nitrogen up to 63.5. that is, the mixture is depleted and its ignition is difficult.

Further, the cupola gases, the passage through the tube 1 of the cupola at a speed of 9–10 m / s, are mixed with the air drawn through the charging port 2, the zone of the highest concentrations of carbon monoxide, as well as the zone of the highest concentrations of carbon monoxide, In order to ignite the mixture of the lacquer gases with air, according to the stoichiometry of the burning of carbon monoxide is located near the wall of the cupola, opposite the charging window 2. The burners 3 of natural gasat are installed so that their flares are located one angle of 20–40 relative to the vertical plane and 10–20 upwards, while they are directed to the zone most prepared for igniting the mixture,

Natural gas to the burners 3 is supplied from the factory gas network and ignited by the igniter. The regulation of the combustion process is carried out by an adjusting washer. The stabilization of the torch burning process takes place in the burner tunnel. The burner flame monitoring is carried out using a flame control device.

The torches of natural gas-fired burners 3 set fire to a mixture of crucible gases with air. Burning

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cupola gases, the passage through tube 1 of the cupola, are emitted into the atmosphere with a carbon monoxide content of 0.1-0.2% by volume.

The torches of the burners 3 are concentrators and stabilizers of the combustion of a mixture of cupola gases with air. The efficiency of the afterburning process is increased to 99.7% due to the deeper penetration of the rigid swirling torches of the burners into the zone most prepared for firing the mixture of cupola gases with air,

5 and also due to the rotation of the torches of the burners 3 by 10–20 ° upwards, which prevents the upward torques from breaking off by the speed of the cupola gases and ensures their stable ignition during all periods of melting: ignition, loading, melting, blowing, etc, d. gas swirling streams provides greater gas-dynamic rigidity torches and

25 greater than their long range compared with the flat ring flows. In addition, the application of the principle of counter-swirling flows intensifies the process of mixing and, accordingly, the process of afterburning of the cupola gas,

The direction of the torch torch axes at an angle of 10-20 ° with respect to the horizontal plane in the direction of movement of the cupola gases and at an angle of 20-40 with respect to the vertical plane in the direction from the charging port 2 also contributes to the gas-dynamic stability

.- afterburning process and allows you to organize the initial stage of afterburning in the optimal zone from the point of view of aerodynamics and combustion process, at the same time there is no flame failure, the afterburning process is stable during all periods of melting, and the afterburning efficiency is highest.

Thus, the application of the proposed method of afterburning of the cupola gases allows them

 effective and stable neutralization and prevention of atmospheric pollution with carbon monoxide, which gives a significant environmental and sanitary-hygienic effect.

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Claims (2)

Invention Formula 1, Method of afterburning of cupola gas in a cupola tube supplied a charging window, consisting in mixing them with air drawn into the window and igniting the resulting mixture with torches of burning natural gas supplied to the cupola tube from different sides of the charging window, characterized in that, in order to increase the efficiency afterburners, natural gas flares JQ 20-40 to the vertical plane in give counter and twist, and FIG. 2 U13350 the directions of the twist of the torches supplied from different sides of the charge room - the windows are mutually opposite, 2. The method according to p. 1, differs from p. And d. In that the axes of the torches are directed at an angle of 10-20 to the horizontal plane in the direction of movement of the cupola-gas gases flow and at an angle side of the charging window.