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Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier

A technology of flue exhaust gas and blast furnace coal injection, which is applied in the field of blast furnace coal injection to achieve the effects of reducing O2 content, increasing combustion speed, and avoiding large emissions

Inactive Publication Date: 2007-07-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant data introductions and practical application precedents for using the flue gas of the hot blast furnace as a carrier for conveying and injecting pulverized coal to realize the recovery and utilization of secondary energy combined with blast furnace coal injection.

Method used

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  • Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier

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Embodiment Construction

[0019] As shown in Figure 1, the present invention consists of a control valve 10, a heat exchanger 3, an induced draft fan 4, an air compressor 5, an injection tank 6, a coal feeder 7, a distributor 8, special pipes and spray guns, etc. Furnace flue exhaust gas coal injection system, and through this system to form and realize the process flow of connection-extraction-temperature control-pressurization-coal feeding-blowing-distribution-coal injection, so as to realize the use of hot blast stove flue gas as carrier injection Coal pulverized system function.

[0020] Its specific process and implementation steps are:

[0021] The induced draft fan 4 draws the hot blast stove flue waste gas from the flue through a special pipe connected to the hot blast stove flue between the chimney 1 and the hot blast stove 2 . Two passages are arranged at the front of the induced draft fan 4: one is directly connected with the induced draft fan 4, and is controlled by a control valve 10 arra...

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Abstract

The invention provides a blast furnace coal spraying method using flue gas of hot-air furnace, concretely using induced draft fan to draw the flue gas of hot-air furnace through special pipeline and control valve out of the flue, cooling by heat exchanger to enter air compressor, after compression, using coal feeder to blow the pulverized coal inputted by blowing tank to distributor, and thus spraying the pulverized coal into the blast furnace from each tuyere. And it implements waste gas utilization, saving primary energy sources; and helps indirect reduction reaction in furnace, so that secondary energy sources can be utilized; besides, largely avoids waste gas CO2 exhaust, reducing atmospheric pollution; can preheat pulverized coal, increasing combustion speed; and has the same system safety as N2 carrier, especially suitable for large scale blast furnace applications and having extremely remarkable energy saving and environmental protection effects.

Description

technical field [0001] The invention relates to a method for recycling waste gas from a hot-blast stove flue, in particular to a method for injecting coal into a blast furnace by using the flue gas from a hot-blast stove as a carrier for injecting coal powder. Background technique [0002] Most of the exhaust gas generated during blast furnace hot blast stove firing is directly discharged to the outside, because the CO in the exhaust gas 2 Up to 35% ~ 42% (the rest of the main components are N 2 ), and its temperature reaches 200°C to 300°C. Not only pollute the environment, but also cause a waste of energy. Therefore, a lot of methods for recovering and utilizing waste heat from flue gas of hot blast stove have been developed at home and abroad, such as the Chinese patent "Method and device for utilizing waste heat of flue gas from blast furnace hot blast stove" (application number 85108099), which adopts devices such as heat pipe heat exchangers, "using The residual hea...

Claims

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Application Information

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IPC IPC(8): F23K3/02F23C9/00
Inventor 汤清华朱建伟王志君王再义吴炽邢本策
Owner ANGANG STEEL CO LTD
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