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
CN101000141AInactive Publication Date: 2007-07-18ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANGANG STEEL CO LTD
Publication Date
2007-07-18
Estimated Expiration
Not applicable · inactive patent

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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.
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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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