Hot blast stove for refining iron and improved construction process

Abstract

The invention discloses a hot blast stove for refining iron and an improved construction process. The stove body comprises a straight body segment (1), a hot blast outlet (2), a stage body segment (3), a distribution mixing segment and an arch crown (5), wherein the combustion area (6) of the hot blast stove is arranged inside the stage body segment (3). By adopting the technical scheme, an external combustor is not needed so that the hot blast stove is transformed into a stable and efficient Kalugin type hot blast stove which has long service life , thereby reducing the temperature of the arch crown of the hot blast stove, improving the combustion efficiency, prolonging the service life, solving complex and dangerous maintenance work for welding nozzles in the structure, eliminating the safety potential, reducing the weight of the arch crown structure, improving the structural stability and wind temperature stability, greatly reducing the maintenance working capacity of the hot blast stove crown and providing favorable condition for offering stable high-temperature wind during blast stove production.

Description

technical field [0001] The invention belongs to the technical field of metallurgical industry production, and relates to the technology of furnaces and kilns for metallurgical industry production. More specifically, the invention relates to a hot blast stove for ironmaking production. Background technique [0002] The hot blast stove is a device for heating and blasting the blast furnace, and it is an indispensable and important part of the modern blast furnace. Raising the air temperature can be achieved through technical measures such as increasing the calorific value of the gas, optimizing the structure of the hot blast stove and air supply pipeline, preheating the gas and combustion-supporting air, and improving the operation of the hot blast stove. Theoretical research and production practice have shown that adopting an optimized structure of the hot blast stove, improving the thermal efficiency of the hot blast stove, and prolonging the life of the hot blast stove are ...

AI Technical Summary

Problems solved by technology

[0003] At present, in blast furnace ironmaking production, hot blast stoves of the emerging cast tube type (that is, top-fired external short-flame burners) are used, as shown in the accompanying drawings of this specification. figure 1 As shown, the external burner 4 and the built-in burner are in the later stage of use, due to the burning loss of the material, the temperature of the external burner 4 is too high. Under the alternating temperature field, the metal burner and the shell material of the hot blast stove Cracks, causing air leakage; at the same time, the air and gas ring pipes are severely corroded

[0004] Due to the limitation of the structural form, the service life of the hot blast stove vault of this structure is short (generally 2 to 3 years, the air temperature is 1150 ℃), and the maintenance workload in the later stage is very heavy, which has become a limiting condition that restricts the stable increase of the air temperature.

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