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Oxygen-enriched combustion method for iron and steel system

An oxygen-enriched combustion, steel technology, applied in blast furnace parts, heating furnaces, blast furnaces, etc., can solve problems such as the inability to achieve oxygen-enriched combustion

Inactive Publication Date: 2019-09-27
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application solves the technical problem that oxygen-enriched combustion cannot be realized in related technologies by providing a method for oxygen-enriched combustion in iron and steel systems

Method used

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  • Oxygen-enriched combustion method for iron and steel system
  • Oxygen-enriched combustion method for iron and steel system
  • Oxygen-enriched combustion method for iron and steel system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] During the combustion period of the hot blast stove 6, the liquid oxygen from the high-pressure oxygen tank 1 is decompressed by the pressure regulating valve 2 and regulated by the oxygen flow regulating valve 3 to become gaseous oxygen with a pressure of 10, and the gaseous oxygen from the blower 11 is passed through the air volume regulating valve 12 After adjustment, the combustion-supporting air with a pressure of 10 is mixed into oxygen-enriched air, wherein the volume ratio of the oxygen flow rate to the combustion-supporting air flow rate is 2%, and the oxygen-enriched air passing through the three-way valve 13 and the reversing valve 14 is preheated by the preheating furnace 4. at 450°C, through the first hot blast valve 7 and the preheated blast furnace 8 coal gas through the gas heat exchanger 9, they enter the hot blast stove 6 together and are mixed and burned into flue gas with a temperature of 1340°C. The heat exchanger 9 preheats the gas temperature of th...

Embodiment 2

[0073] During the combustion period of the hot blast stove 6, the liquid oxygen from the high-pressure oxygen tank 1 is decompressed by the pressure regulating valve 2 and regulated by the oxygen flow regulating valve 3 to become gaseous oxygen with a pressure of 15kPa, and the gaseous oxygen from the blower 11 through the air volume regulating valve 12 After adjustment, the combustion-supporting air with a pressure of 15kPa is mixed into oxygen-enriched air, wherein the volume ratio of the oxygen flow rate to the combustion-supporting air flow rate is 5%, and the oxygen-enriched air passing through the three-way valve 13 and the reversing valve 14 is preheated by the preheating furnace 4. The temperature is 650°C, and the first hot blast valve 7 and the preheated blast furnace 8 coal gas through the gas heat exchanger 9 enter the hot blast stove 6 and mix and burn into flue gas with a temperature of 1440°C. The heat exchanger 9 preheats the gas temperature of the blast furnace...

Embodiment 3

[0076] During the combustion period of the hot blast stove 6, the liquid oxygen from the high-pressure oxygen tank 1 is decompressed by the pressure regulating valve 2 and regulated by the oxygen flow regulating valve 3 to become gaseous oxygen with a pressure of 13kPa, which is mixed with the gaseous oxygen from the blower 11 through the air volume regulating valve 12 After adjustment, the combustion-supporting air with a pressure of 13kPa is mixed into oxygen-enriched air, wherein the volume ratio of the oxygen flow rate to the combustion-supporting air flow rate is 3%, and the oxygen-enriched air passing through the three-way valve 13 and the reversing valve 14 is preheated by the preheating furnace 4. The temperature is 600°C, through the first hot blast valve 7 and the preheated blast furnace 8 coal gas through the gas heat exchanger 9 enters the hot blast stove 6 together and combusts into flue gas with a temperature of 1400°C, after heat exchange through the checker brick...

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Abstract

The invention discloses an oxygen-enriched combustion method for an iron and steel system. The method is applied to a blast furnace hot blast stove system and is based on an oxygen-enriched combustion system to control a blast furnace hot blast stove to realize oxygen-enriched combustion, wherein the oxygen-enriched combustion system particularly comprises an oxygen tank, a preheating furnace, the hot blast stove, a blast furnace, a coal gas heat exchanger, a blower, a three-way valve and a reversing valve. Compared with the prior art, on one hand, the oxygen-enriched combustion in the hot blast stove is realized, the heat loss generated when the hot blast stove exhausts smoke is reduced, and the heat efficiency of the hot blast stove is improved; and on the other hand, after oxygen-enriched cold air passes through lattice bricks, the air temperature is increased, so that the high air temperature is realized through the low-heat-value coal gas, therefore the combustion efficiency of the blast furnace is improved, and the technical problem that the oxygen-enriched combustion cannot be realized in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to an oxygen-enriched combustion method for a steel system. Background technique [0002] As an important part of the ironmaking system, the hot blast stove is the key equipment for blast furnaces to achieve high blast temperature. In order to achieve high wind temperature, there are currently domestic and foreign technologies such as co-firing high calorific value gas, heat exchanger preheating technology, hot blast stove self-preheating technology, high-temperature air combustion preheating technology, etc. [0003] Oxygen-enriched combustion refers to combustion when the oxygen content in the air supplied for combustion is greater than 20.9%. Due to the high-energy collisions between combustible molecules in the fuel and oxygen molecules, the supply of oxygen determines whether the combustion process is fully completed. Due to the high oxygen content in oxygen-enriched comb...

Claims

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Application Information

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IPC IPC(8): C21B9/14C21B9/10C21B5/06
CPCC21B5/06C21B9/10C21B9/14Y02P10/25
Inventor 陈冠军刘清梅竺维春吴刚王金花
Owner SHOUGANG CORPORATION
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