Utilization method of waste heat from ferronickel smelting in rkef process

Abstract

The invention discloses an RKEF process nickel-iron smelting waste heat utilizing method. The method comprises that electric furnace high-temperature flue gas is subjected to heat exchange with normal-temperature air by a heat exchanger, and then 350-450 DEG C hot air obtained from heat exchange is used as secondary air required for rotary kiln injection coal combustion and is sent into a rotary kiln for utilization. Further, high-temperature flue gas discharged by the rotary kiln is firstly dedusted, then blown into an air mixing chamber of a drying kiln by a blower to be mixed with high-temperature flue gas generated by a combustion chamber of the drying kiln, and thus obtained 350-450 DEG C flue gas as a heat source of the drying kiln is utilized. The method realizes full utilization of the electric furnace high-temperature flue gas; and the waste heat utilization method has high heat utilization rate, saves coal consumption, reduces carbon emissions and sulfur emissions in the atmosphere, and has obvious economic benefits and social benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of waste heat in ferroalloy production, and specifically relates to a method for utilizing waste heat in ferronickel smelting in the RKEF process. Background technique [0002] Ferronickel is an important raw material for the production of stainless steel and heat-resistant cast steel, etc. Adding nickel to steel can improve the corrosion resistance of steel, improve the tensile strength, cold deformation and welding performance of steel, and is widely used in machinery, medical, national defense, Light industry and other fields. At present, nickel provided by ferronickel has accounted for more than 50% of the world's nickel demand, and my country has reached more than 75% in 2013, and the proportion will increase. [0003] In ferronickel production, the RKEF process has developed the most rapidly. This process has mature technology, simple and easy-to-control equipment, and high producti...

AI Technical Summary

Problems solved by technology

[0003] In ferronickel production, the RKEF process has developed the most rapidly. This process has mature technology, simple and easy-to-control equipment, and high production efficiency, and is accepted by more and more enterprises. Coke and electric energy, high energy consumption, high production cost, excessive slag in the melting process, high melting temperature, dust pollution, etc.

It can be seen that the drying kiln process, rotary kiln process and electric furnace process in the RKEF process all consume a lot of energy, which consumes a lot of energy and high production costs.

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