Method for heating alloy by utilizing high-temperature flue gas of converter

Abstract

The invention relates to a method for heating an alloy by utilizing high-temperature flue gas of a converter. According to the method, a high-temperature flue gas extraction hole and a flue gas backflow hole are formed in a converter flue; the high-temperature flue gas extraction hole is connected to an alloy baking chamber through a flue gas introduction pipeline; a nitrogen inlet is formed in the flue gas introduction pipeline and is connected to a nitrogen pipeline; a high-temperature flue gas buffer chamber and an alloy baking bed are arranged in the alloy baking chamber; a plurality of flues are arranged at the bottom of the alloy baking bed; grate plates, baking grooves and an alloy hopper are sequentially arranged above the flues; a hydraulic lifting door is arranged at the alloy discharge end of the alloy baking chamber; alloy discharge ports of the baking grooves are connected to an alloy tank through an alloy chute; a hydraulic lifting device is arranged below the grate plates; the tail end of the alloy baking chamber is connected to the flue gas backflow hole through a flue gas discharge pipeline; and a fan is arranged in the flue gas discharge pipeline. The method has the advantages that oxidation of the alloy in the baking process can be avoided, the cleanliness of molten steel can be conveniently improved, and the alloy recovery rate can be conveniently increased;and meanwhile, the recovery efficiency of the sensible heat of the high-temperature flue gas of the converter can be improved, the application range of the sensible heat of the high-temperature fluegas of the converter can be widened, and therefore the purposes of saving energy and reducing consumption can be achieved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for heating alloys by utilizing high-temperature flue gas from a converter. Background technique [0002] Ferroalloy materials are used for deoxidation and alloying in converter steelmaking, and the amount of alloy added varies from several hundred kilograms to several tons depending on the type of steel being smelted. Since the ferroalloy at normal temperature will absorb a lot of heat when it is added to the molten steel above 1600 ℃, the temperature of the molten steel will be lowered. In order to ensure the castability of the molten steel, the converter must increase the tapping temperature. However, high-temperature tapping will bring a series of disadvantages. First, high-temperature tapping will easily lead to a decrease in the life of converter refractories and an increase in refractory consumption; secondly, high-temperature tapping will increase the blowing...

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Problems solved by technology

The main principle of heating the alloy by the above-mentioned alloy baking devices is to complete the heat released by gas combustion. The disadvantage of this method is that it will consume a large amount of gas, which will increase the production cost; High-temperature oxidation inevitably occurs during the heating process, which reduces the yield of the alloy

In order to avoid these deficiencies, the Chinese patent with the authorized notification number CN204085095U discloses an "alloy baking oven", which uses the waste heat of high-temperature slag produced in the metallurgical process to bake the alloy. Although this method can make the waste heat of high-temperature slag obtain It can be used effectively and reduce the cost of alloy baking. However, because the baking method relies on the radiant heat of high-temperature slag to bake the alloy, after a certain period of baking, the surface temperature of the high-temperature slag will decrease, and the radiated heat will also decrease with time. Therefore, its baking capacity is limited; at the same time, the surface of the alloy will be oxidized during the baking process, which reduces the yield of the alloy

[0004] In view of the deficiencies in the above-mentioned alloy baking method, the present invention proposes a method for heating the alloy by utilizing the sensible heat of high-temperature flue gas generated during the converter blowing process, which can avoid the disadvantages of the current alloy baking method

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