Gas-based reduced iron shaft furnace

Abstract

The invention relates to a gas-based reduced iron shaft furnace which sequentially comprises a receiving device, a shaft furnace body and a discharging device from top to bottom. A main reaction area of the shaft furnace body is of a circular truncated cone structure, a thermal reduction gas inlet is located in the lower section of the reaction area, two sets of temperature measuring devices are arranged at different heights of the reaction area of the shaft furnace body, the other set of temperature measuring devices are arranged above the thermal reduction gas inlet, and a material receiving bell is arranged on the inner side of the top of the shaft furnace body. The top of the shaft furnace body is provided with an ascending pipe for recycling furnace top circulating gas, and a lower cooling area of the shaft furnace body is provided with a discharging and guiding device. The shaft furnace is simple in structure and small in size, production of the shaft furnace is easier to control, and the overall shaft furnace equipment manufacturing and operating cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a novel gas-based reduced iron shaft furnace. Background technique [0002] At present, gas-based shaft furnace direct reduced iron technology (sponge iron or DRI) has been maturely applied abroad as the main non-blast furnace ironmaking technology. It is an important production technology for improving the structure of iron and steel products, improving the quality of iron and steel products, and realizing clean smelting. It is also an important production technology for the sustainable development of the iron and steel industry, energy saving and emission reduction, and environmentally friendly development mainstream direction. [0003] my country is a big steel producer. In 2019, my country's crude steel output reached 996 million tons, accounting for about 53% of the global total. However, my country's steelmaking process is basically based on th...

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Problems solved by technology

[0005] In order to solve the technical defects in the structure design of the gas-based shaft furnace in the prior art, the height of the feeding device and the height of the reduction section of the shaft furnace are longer, and the oxidized pellet material in the shaft furnace is heated and expanded, which increases the friction between the material and the inner wall of the furnace. Large, and the erection of the shaft furnace body requires a large amount of supporting steel structure materials, which makes the overall shaft furnace equipment manufacturing and operating costs high. The purpose of the present invention is to provide a new type of gas-based reduced iron shaft furnace

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