Blast-furnace ironmaking raw material hot delivery and hot charging process and equipment

Abstract

The invention provides a blast-furnace ironmaking raw material hot delivery and hot charging process and blast-furnace ironmaking raw material hot delivery and hot charging equipment. The process comprises the following steps of: delivering mature red coke from a coke oven carbonization chamber, thermally sintered ore produced by a sintering machine and thermal pellet produced by a pellet firing machine into a transfer tank through a delivery trolley; taking the transfer tank as a buffer and heat insulation container for the red coke, thermally sintered ore and thermal pellet respectively; and thermally charging the blast furnace by utilizing the buffer and heat insulation functions of the transfer tank. The invention has the advantages that: thermal energy is saved, the coke ratio is reduced and pig iron yield is improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a technology and equipment for hot feeding and hot charging of blast furnace ironmaking raw materials. Background technique [0002] At present, ironmaking raw materials in ironworks are loaded into blast furnaces at room temperature. Although it is convenient to operate, it wastes a lot of heat energy. Moreover, for the cooling of various raw materials, related equipment will be added. It takes a lot of energy to run the equipment and to reheat them once they go into the blast furnace. Specifically, the energy wasted in the following three links is huge. [0003] First, in the prior art, the coking workshop of the coking plant is equipped with a coke treatment system, and the red coke released from the coke oven carbonization chamber is sent to the ironworks. [0004] The advantages of traditional wet coke quenching are that the process is simple, the equipment occupie...

AI Technical Summary

Problems solved by technology

Although it alleviates the shortcomings of traditional wet coke quenching in some aspects, it still cannot fundamentally solve the problems of energy waste, environmental pollution and poor coke quality.

[0006] Dry coke quenching was once expected to be widely used, but the operating experience of some coking plants was contrary to expectations, and the investment cost and operating cost were high, which raised doubts about the feasibility of coke dry coke quenching equipment. This shortcoming is in Especially in large factories

[0007] Second, when the sintered ore is fired on the sintering machine and unloaded from the tail of the machine, its temperature is 600-1000°C. In the process of the prior art, it needs to be cooled to below 150°C. Electric energy is needed, and the heat wasted in cooling 1 ton of sinter is 0.93GJ

[0009] Fourth, due to the instability of the raw material moisture (free water) in the iron-making blast furnace, the furnace condition is often unstable and the production is affected; The crystal water in the water decomposes rapidly at 500-600°C, and the crystal water must reach 800-1000°C to completely remove the crystal water

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