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Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources

A rotary hearth furnace and short-process technology, applied in the field of iron and steel metallurgy, can solve the problems of high production cost, high comprehensive energy consumption, and failure to achieve the effect of high-efficiency energy utilization and high-efficiency reuse, and achieve small footprint and low operating costs. Low, high energy efficiency effect

Inactive Publication Date: 2010-06-09
LAIWU IRON & STEEL GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current short process has not achieved the complete short-process factory effect of efficient energy utilization, efficient secondary energy reuse, high-efficiency waste heat utilization, and comprehensive utilization of iron-containing dust from direct ore steelmaking to finished products. High energy consumption and high production cost

Method used

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  • Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources
  • Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources
  • Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources

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Embodiment Construction

[0009] A short-process rotary hearth furnace continuous steelmaking method that comprehensively utilizes energy, including material ball milling, batching, pelletizing, pelletizing shaft furnace preheating, rotary hearth furnace pre-reduction, continuous steelmaking, molten steel refining, continuous casting, and rolling Become a material, the steps are as follows:

[0010] 1) The iron-containing materials are pelletized and processed into pellets after ball milling and batching.

[0011] 2) The pellets obtained in step 1) are preheated to 3500-450°C by the 850-950°C exhaust gas discharged from the oxygen-enriched air preheater of the rotary hearth furnace in the preheating device and sent to the rotary hearth furnace.

[0012] 3) In the rotary hearth furnace, the pellets are burned and heated by high-temperature reformed gas at 800-850°C to obtain pre-reduced metallized pellets with a metallization rate of 85-95% and a furnace temperature of 1000-1200°C for continuous steelma...

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Abstract

The invention relates to a short-flow environment-friendly plant for steel production with a rotary hearth furnace continuous steelmaking method and equipment as the cores and with noncoking coal or natural gases as the main energy. Coal dust (natural gases, etc.) and oxygen are jetted into a continuous steelmaking furnace to smelt high temperature pre-reduced metallized pellets provided by the rotary hearth furnace to realize continuous steelmaking, and the molten steel is directly manufactured into the finished products by cast-rolling integration equipment after being refined or is manufactured into the finished products by traditional continuous casting and steel rolling. Meanwhile, the high temperature coal gas generated by a continuous steelmaking furnace is used for the pre-reduced pellets provided by the rotary hearth furnace after being reformed and the other part of high temperature reformed coal gas can be used for traditional continuous casting and steel rolling heating furnaces. The heat of the high temperature waste gas in the rotary hearth furnace is cascade-utilized to preheat the oxygen-enriched air and the pellets for the rotary hearth furnace. The high temperature waste gas in the steel rolling heating furnace is used for preheating the air for the heating furnace. The iron-containing dust is recycled and the steel slag and other dust are used for manufacturing cement. Therefore, the plant has high comprehensive utilization efficiency of energy, low energy consumption, low production cost, less emission and small total investment, and saves land.

Description

technical field [0001] The invention relates to a short-flow rotary hearth furnace continuous steelmaking method for steel and steel production, in particular to a complete short-flow industrial steel production method that uses non-coking coal as the main component and comprehensively utilizes energy, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] With the rapid development of the world's iron and steel industry and the international community's increasing emphasis on environmental protection, energy conservation and emission reduction, and the shortage of resources such as iron ore and coking coal, people are constantly looking for an iron or steelmaking method that does not use coking coal. It is a complete short-process factory method for the effective utilization of various iron-containing dusts, the effective utilization of secondary energy generated in the process, and the reuse of waste heat generated. [0003] At prese...

Claims

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Application Information

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IPC IPC(8): C21B13/14C21C7/10C21C7/06F27B19/04
CPCY02P10/143
Inventor 董杰邹仲树李丰功曾晖魏国王楠李强陈敏王学斌王博
Owner LAIWU IRON & STEEL GRP
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