Shaft furnace emptying technique of COREX smelting reduction device

Abstract

The invention discloses a shaft furnace emptying technique of a COREX smelting reduction device, which comprises the following steps of: (1) opening an observing manhole and observing the blocking situation in the furnace; (2) removing DRI spiral; (3) crashing and clearing the materials in the furnace: clearing 8 distribution cabins and upper batch cakes, and crashing the accumulated materials inthe furnace through a bale breaker; (4) clearing the bustle pipes of the shaft furnace and the vent holes in the furnace: clearing 40 bustle pipes of the shaft furnace and 80 vent holes in the furnace; and (5) closing the manholes on the furnace top and the manholes above the DRI spiral: closing all the manholes and the deashing flanges of the 40 bustle pipes after all the clearing work is finished and the reassembly of the DRI spiral is accomplished; after all the manholes are closed well, the airtight test of the shaft furnace is implemented. By adopting the shaft furnace emptying technique,not only the operation efficiency can be improved, but also the operation safety is high.

Description

Technical field [0001] The present invention relates to a maintenance process, and specifically to a shaft furnace clearing process of a COREX smelting reduction device. Background technique [0002] Baosteel Co., Ltd.'s Medium and Heavy Plate Branch adopts COREX, a new iron-making process. COREX (COAL REDUCTION EXTREME), as the name suggests, can directly use non-coking coal to produce molten iron. It breaks through the reliance of traditional blast furnace ironmaking on coke resources and maximizes the use of my country's abundant iron-making process. For non-coking coal, the success and further development of COREX technology is of great significance to the sustainable development of my country's steel industry. [0003] The COREX smelting reduction device has the advantages of energy saving, environmental protection, and small footprint, and is the future development direction of the ironmaking industry. The COREX smelting reduction device consists of two main bodies: a ...

AI Technical Summary

Problems solved by technology

[0005] 1. The adhesion between the agglomerated material in the furnace and the furnace wall is large, and it is difficult to break and chisel mechanically

[0006] 2. The amount of accumulated material in the furnace is large, and the accumulated material is about 300t each time the shaft furnace is emptied

[0007] 3. There is a risk of collapse

When the shaft furnace is emptied, the accumulated material in the furnace will fall as a whole after being broken and chiseled. The collapsed material will cause the combustion of hot dust, and the flame will be ejected from the observation manhole on the upper part of the DRI spiral, which is a high-risk operation.

[0008] 4. High temperature operation in the furnace, high gas content, high dust content, and lack of oxygen

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