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Blast furnace ironmaking technology and method utilizing waste heat steam

A technology of blast furnace ironmaking and waste heat steam, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of low power generation efficiency of waste heat steam, shorten blast furnace smelting time, reduce production costs, and reduce low-temperature reduction pulverization Effect

Inactive Publication Date: 2021-01-05
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a blast furnace ironmaking technology and method using waste heat steam, which solves the problem that waste heat steam in iron and steel enterprises is mainly used for power generation and the power generation efficiency of waste heat steam is low

Method used

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  • Blast furnace ironmaking technology and method utilizing waste heat steam
  • Blast furnace ironmaking technology and method utilizing waste heat steam
  • Blast furnace ironmaking technology and method utilizing waste heat steam

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Embodiment 1

[0057] In the fourth quarter of 2018, a factory had two 4000m3 blast furnaces, one of which adopted this technology, and the ton of iron was fed into 420℃, 3.84MPa, and the pressure of 370℃, 0.8MPa steam was 45kg / t through differential pressure power generation. The cost of pig iron was reduced from 2210 yuan / t to 2153 yuan / t, and the cost of pig iron is reduced by about 57 yuan / t. The daily iron output of one is 8960t / d, and the one with steam and oxygen enrichment is 11920t / d. The calorific value of blast furnace gas is increased by 11%. With the same consumption of blast furnace gas, the temperature of hot blast stove is increased by 65°C.

Embodiment 2

[0059] In the first quarter of 2019, a factory had two 2500m3 blast furnaces, one of which adopted this technology, the temperature of 200 ℃ and the pressure of 0.8MPa steam per ton were 50kg / t, the cost of pig iron was reduced from 2250 yuan / t to 2188 yuan / t, and the cost of pig iron was reduced by 62 Yuan / t or so. The daily iron output of one is 6130t / d, and the one with steam and oxygen enrichment is 8000t / d. The calorific value of blast furnace gas increases by 10%, and the same consumption of blast furnace gas increases the temperature of hot blast stove by 54°C.

[0060] To sum up, the blast furnace ironmaking technology and method using waste heat steam improves the utilization factor of the blast furnace and reduces production costs. due to H 2 , CO reduction Fe 2 o 3 → Fe 3 o 4 →FeO→Fe kinetics and thermodynamics characteristics are beneficial to increase the width of the indirect reduction zone, increase the reduction speed, move the high temperature zone down,...

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Abstract

The invention discloses a blast furnace ironmaking technology and method utilizing waste heat steam, and relates to the technical field of iron and steel smelting. The blast furnace ironmaking technology and method utilizing the waste heat steam comprise a steam pipe network, an oxygen pipe network and an air blower; the steam pipe network and the oxygen pipe network communicate with a smoke heatexchanger through an automatic valve and an electronic flow meter in sequence; the air blower communicates with a hot blast stove through an automatic valve and an electronic flow meter; the smoke heat exchanger communicates with the hot blast stove; and the hot blast stove communicates with a blast furnace. According to the blast furnace ironmaking technology and method utilizing the waste heat steam, the utilization coefficient of the blast furnace is increased, and the production cost is reduced. Due to the kinetic and thermodynamic characteristics of H2 and CO reduced Fe2O3-Fe3O4-FeO-Fe, the width of an indirect reduction zone is increased, the reduction speed is increased, a high-temperature zone moves downwards, low-temperature reduction pulverization is reduced, the breathability ofraw materials is improved, the blast furnace smelting time is shortened, smooth operation of the blast furnace is facilitated, and the utilization coefficient of the blast furnace is increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a blast furnace ironmaking technology and method using waste heat steam. Background technique [0002] The most conventional process in the modern iron and steel smelting process is blast furnace ironmaking + hot metal pretreatment + converter steelmaking + continuous casting. Among them, blast furnace ironmaking uses iron ore and coke as the main raw materials. Coke is used as the main reducing agent and forms the internal skeleton of the blast furnace to reduce the iron ore raw materials that enter the blast furnace at the top. However, coking is extremely polluting to the environment. With the awareness of environmental protection Gradually increasing the use of coke in the ironmaking process has become a very urgent technical need. Existing blast furnaces usually blow air at the lower part, and a large amount of nitrogen gas will be blown in during the air bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B9/14
CPCC21B5/00C21B9/14C21B2100/60
Inventor 陈东峰张建李帮平李小静张晓萍王思维杜先奎
Owner MAANSHAN IRON & STEEL CO LTD
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