Method of firing resin refractories

 

(57) Abstract:

The invention relates to metallurgy, and more specifically to the refractory lining of metallurgical units. The technical effect of the use of the invention is to achieve a complete post-combustion gases from solastalgia refractories during heat treatment, including benzpyrene to carbon dioxide and water. How ambiga resin refractories carried out by impact with the oxy-fuel flame with a temperature of at least 2000oTo achieve a surface temperature refractories, not below 600oWith, the walls of the afterburner is heated to temperatures above 1000oAnd Inuktitut gases oxygen stream and burn in oxygen flame with a temperature not less than 1300oC.

The invention relates to metallurgy, and more specifically to the refractory lining of metallurgical units.

There is a method of neutralizing gases released during the heat treatment of the resin refractories, including the combustion gases. This produces a burning axial flow auxiliary fuel with obtaining high-temperature gases, serves tangential flow of the mixture of the environment, the 300aboutWith over 0,05-0,4 C. After exposure to the mixture additionally served oxidant in the form of one or more threads [1]

The disadvantage of this method is palletirovanie exhaust gases in the preliminary heat. This is because the splitting of the exhaust gases on the carbon and hydrogen are most effectively implemented without palletirovaniya waste gases other gases and at a lower temperature. This reduces the efficiency of the preparation process of the reaction mixture by mixing streams of gases in the secondary combustion chamber. The result is not a full afterburning released from the refractory gases that degrades the environment in the production of resin refractories.

The closest in technical essence is a method of heat treatment of the resin refractories, including the decomposition gases in the presence of the reagent. When gases are heated in the heater and sent to the tunnel from which the gases are again sent to the heater. The excess gases are selected and digets in the presence of reagents in a special furnace with the aim of neutralizing medium substances formed by the decomposition of si. Heat treatment temperature is about 300aboutWith, the refractory product is cooled to 50aboutWith the heat treatment time is 8 hours, including in the area of proper heat treatment 5 h [2]

The disadvantage of this method is the partial oxidation gases, including benzpyrene, the most dangerous from an environmental point of view. This is due to the fact that the processing of the resin-product gases heated in the heater, do not provide the required intensity of removal of benzpyrene and the energy level of the post-combustion of the abundance of these gases in the gas torch is not sufficient for decomposition chemically stable hydrocarbons (acrolein, benzpyrene and other). The degree of post combustion of these hydrocarbons in the existing post combustion chambers does not exceed 95-96% which is not enough to ensure sanitary standards in the working area.

The technical effect of the use of the invention is to achieve a complete post-combustion gases from the refractories during heat treatment, including benzpyrene to carbon dioxide and water.

This technical effect is reached by the fact that the heat-treated resin-refractory carried out by exposure to the gas is below 600aboutWith heated walls of the afterburner to a temperature above 1000aboutWith, Inuktitut gases oxygen jet and dorogaya oxygen flame with a temperature not less than 1300aboutC.

Full afterburning and thus complete neutralization of gases will occur because as reagent use oxygen. This greatly increases the temperature of the combustion gases, which intensifies the process of decomposition gases from refractory carbon and hydrogen. The breakdown of hydrocarbons into simpler compounds contributes preheated to 600aboutWith plantatreeusa structure formed on the surface of the lining and having catalytic properties. This process occurs with high intensity as gases not Ballesteros inert substances such as nitrogen from the air. As practice shows, already at this stage compounds such as benzpyrene, broken down into simpler and lagcoivaarita hydrocarbons naphthalene series. Subsequent mixing with the reactant (oxygen) injection by way of these compounds already in the hot tunnel afterburners completely burned to dioxi what arnosti selection of refractories gases. At smaller values decrease the degree of gas evolution. Large values set does not make sense, because it would be a waste of energy without further intensification of gas emissions.

The surface temperature of the refractories at least 600aboutWith due regularity evaporation of resinous substances in the body of the refractories. At lower values, there will be no venting of refractories. For large values will be a waste of energy without further intensify the removal of gases.

The temperature of the oxygen torch not less than 1300aboutWith due regularity of the decomposition gases. At smaller values will not achieve the required intensity of the decomposition gases. For large values will be a waste of energy without further intensification of decomposition gases.

Below is an example implementation of the proposed method, which does not exclude other options within the claims.

P R I m m e R. Products from melodramatic of refractories for the lining of steel ladles or converters, put in the work area lined Agra is the second allocated resinous substance, under the influence of high-temperature oxy-fuel torch to split, forming on the surface of the refractories carbon-ceramic structure.

When the temperature reached on the surface of the refractories at least 600aboutIts inner layer is heated to a temperature sufficient for evaporation of harmful substances, including benzpyrene, having a boiling point of 495aboutC.

Next, the released gases injections oxygen stream into the channel of the diffuser injector. This ensures the preparation of the reaction mixture with optimum excess oxygen in it within 10-12% of the burner Wall of the channel is heated to a temperature of at least 1000aboutC, and the temperature of the flame in the channel support is not less than 1300aboutC. under these conditions, complete oxidation and neutralization of carbon-hydrogen gases, including benzpyrene, which decomposes into water and carbon dioxide.

The application of the proposed method using a gas-oxygen reaction mixture allows to increase the degree of neutralization of gases released from the refractory to the level of not lower than 99.9% of including completely eliminate the allocation of benzo-pyrene, which znecistenych refractories.

METHOD of FIRING RESIN REFRACTORY materials by heating them with subsequent oxidation released from the refractory gases in the secondary combustion chamber, characterized in that the heating of the resin refractories are gas-oxygen flame with a temperature of at least 2000oTo achieve the temperature on the surface is not below 600oWith, the walls of the afterburner is heated to temperatures above 1000oWith, Inuktitut there oxygen stream released from the refractory gases and dorogaya their oxygen flame with a temperature not less than 1300oC.

 

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