CN202007237U - Coal injection and pulverization flue gas system for blast furnace - Google Patents

Coal injection and pulverization flue gas system for blast furnace Download PDF

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Publication number
CN202007237U
CN202007237U CN2011200150994U CN201120015099U CN202007237U CN 202007237 U CN202007237 U CN 202007237U CN 2011200150994 U CN2011200150994 U CN 2011200150994U CN 201120015099 U CN201120015099 U CN 201120015099U CN 202007237 U CN202007237 U CN 202007237U
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China
Prior art keywords
flue gas
coal
blast stove
pulverization
hot blast
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Expired - Lifetime
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CN2011200150994U
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Chinese (zh)
Inventor
颜新
牛立祥
王贤
吴波
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CISDI Engineering Co Ltd
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CISDI Engineering Co Ltd
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Priority to CN2011200150994U priority Critical patent/CN202007237U/en
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Abstract

The utility model discloses a coal injection and pulverization flue gas system for a blast furnace. The coal injection and pulverization flue gas system comprises a drying furnace, a coal pulverizer, a coal powder collector and a coal powder fan which are communicated through pipelines sequentially. The low temperature flue gas inlet of the drying furnace is communicated with a hot blast stove exhaust pipeline through a valve II. The exhaust pipe of the coal powder fan is divided into two paths, wherein one path of the exhaust pipe is communicated with a chimney, and the other path of the exhaust pipe is connected on a pipeline between the low temperature flue gas inlet of the drying furnace and the valve II through a valve I. The coal injection and pulverization flue gas system for the blast furnace can be switched between two working ways of inducing waste gas of a hot blast stove and automatically circulating flue gas by a pulverizing system. When a hot blast stove system works, the waste gas of the hot blast stove is induced to enter the flue gas system, energy of the waste gas of the hot blast stove is recycled, so that the fuel consumption of the system is low, the waste of the hot blast stove has low oxygen content and the system is safe to operate. When the hot blast stove system damps down, the coal injection and pulverization flue gas system is switched to be in the working way of automatically circulating flue gas by the pulverizing system, the pulverizing system cannot be influenced by damping-down of the hot blast stove system and is ensured to operate continuously.

Description

The coal injection and pulverization of blast furnace flue gas system
Technical field
The utility model belongs to technical field of blast furnace ironmaking, is specifically related to the flue gas system that uses in a kind of coal injection and pulverization of blast furnace process.
Background technology
There are two kinds of main flue gas systems in the pulverized coal preparation system of current pulverized coal injection, is respectively the process system of quoting the exhaust gas of hot-blast stove process system and quoting pulverized coal preparation system self-circulation flue gas, and all there are relative merits separately in two kinds of process programs:
One, exhaust gas of hot-blast stove system: exhaust gas of hot-blast stove is sent in the drying oven, send into coal pulverizer after being mixed and made into qualified coal pulverizer dry gas with the high-temperature flue gas of dry combustion furnace, the primary mixture that comes out from coal pulverizer is after coal collector is collected coal dust, and flue gas enters atmosphere by coal powder fan; Its advantage has been to make full use of the waste heat of exhaust gas of hot-blast stove, makes the drying oven thermal load little, and the blast furnace gas consumption is little, and the flue gas system oxygen level is low simultaneously, and vapour content is low, system's safety in operation height; But its shortcoming is system and is subject to the influence of hot blast stove system that when the hotblast stove damping down, pulverized coal preparation system can't be worked, and has a strong impact on the independent operating of pulverized coal preparation system;
Two, pulverized coal preparation system self-circulation flue gas system: it is without exhaust gas of hot-blast stove, and the flue gas part that coal powder fan is sent enters atmosphere, another part is sent in the drying oven, sends into coal pulverizer after being mixed and made into qualified coal pulverizer dry gas with the high-temperature flue gas of dry combustion furnace, forms the flue gas self-circulation; Its advantage is to use the pulverized coal preparation system of self-circulation flue gas to overcome the influence of hot blast stove system to pulverized coal preparation system, and pulverized coal preparation system independence is improved, and can move according to system requirements; But its shortcoming is that self-circulation flue gas relatively hot wind furnace spent air temperture is low, make the drying oven load big, the blast furnace gas consumption is big, and during system stable operation, recycle the flue gas of partly draining, make in the flue gas water capacity and oxygen level higher, the design and the control of pulverized coal preparation system is proposed requirements at the higher level.
In sum, all there is certain problem in existing coal injection and pulverization of blast furnace flue gas system, thereby has restricted the steady running of blast furnace pulverized coal preparation system; The exhaust gas of hot-blast stove system energy consumption is low, the security of system height, but system's operation is subjected to the influence of hotblast stove damping down and can not guarantees; Self-circulation system is not subjected to the influence of hot blast stove system, system independence height, but system energy consumption height, the potential risk that circulating flue gas exists dewfall and oxygen level to exceed standard.Therefore, need to explore a kind of coal injection and pulverization of blast furnace flue gas system, make it have the advantage of two systems simultaneously: system's operation energy consumption is low, and is safe, is not subjected to the influence of hotblast stove operating mode simultaneously again, ensures the independence of pulverized coal preparation system operation.
Summary of the invention
In view of this, the utility model provides a kind of coal injection and pulverization of blast furnace flue gas system, and this system's operation energy consumption is low, safe, is not subjected to the influence of hotblast stove operating mode simultaneously again, ensures the independence of pulverized coal preparation system operation.
Coal injection and pulverization of blast furnace flue gas system of the present utility model, comprise the drying oven, coal pulverizer, coal collector and the coal powder fan that are communicated with successively with pipeline, the low-temperature flue gas inlet of described drying oven is communicated with the exhaust gas of hot-blast stove pipeline by the valve II, the vapor pipe of described coal powder fan is divided into two-way, one tunnel logical chimney, another road is inserted on the low-temperature flue gas inlet and the pipeline between the valve II of drying oven by the valve I.
Further, the pipeline between described exhaust gas of hot-blast stove pipeline and the valve II is provided with induced draft fan.
The beneficial effects of the utility model are: the utility model can switch quoting between exhaust gas of hot-blast stove and two kinds of mode of operation of pulverized coal preparation system self-circulation flue gas: when hot blast stove system is worked, the temperature of exhaust gas of hot-blast stove is between 140 ℃~180, quote exhaust gas of hot-blast stove and enter flue gas system, recycled the energy of exhaust gas of hot-blast stove, it is low that system fuel is consumed, and the exhaust gas of hot-blast stove oxygen level is low, system's operating safety; When the hot blast stove system damping down, but still need to ensure when pulverized coal preparation system moves, switch under the mode of operation of pulverized coal preparation system self-circulation flue gas, at this moment, the partial fume that pulverized coal preparation system is discharged is introduced flue gas system once more, pulverized coal preparation system only is between 80~100 from the smoke discharging temperature, temperature is lower, so the fuel consumption of flue gas system increases to some extent, but by recycling from smoke discharging, make pulverized coal preparation system not be subjected to the influence of hot blast stove system damping down, ensured the continuous service of pulverized coal preparation system.
Description of drawings
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail, wherein:
Fig. 1 is a process flow sheet of the present utility model.
Embodiment
Hereinafter with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail.
Fig. 1 is a process flow sheet of the present utility model, as shown in the figure, coal injection and pulverization of blast furnace flue gas system of the present utility model, comprise the drying oven 1, coal pulverizer 2, coal collector 3 and the coal powder fan 4 that are communicated with successively with pipeline, the low-temperature flue gas inlet of described drying oven 1 is communicated with exhaust gas of hot-blast stove pipeline 7 by valve II 6, the vapor pipe of described coal powder fan 4 is divided into two-way, one tunnel logical chimney, and another road is inserted on the low-temperature flue gas inlet and the pipeline between the valve II 6 of drying oven 1 by valve I 5.
As further improvement of the utility model, the pipeline between described exhaust gas of hot-blast stove pipeline 7 and the valve II 6 is provided with induced draft fan 8; Exhaust gas of hot-blast stove is sent into drying oven 1 by induced draft fan 8.
The control method of coal injection and pulverization of blast furnace flue gas system of the present utility model, when hot blast stove system is worked, Open valve II 6, valve-off I 5, exhaust gas of hot-blast stove is sent in the drying oven 1, send into coal pulverizer 2 after being mixed and made into qualified coal pulverizer dry gas with drying oven 1 incendiary high-temperature flue gas, the primary mixture that comes out from coal pulverizer 2 is after coal collector 3 is collected coal dusts, and flue gas enters atmosphere by coal powder fan 4; When the hot blast stove system damping down, Open valve I 5, valve-off II 6, a flue gas part of being sent by coal powder fan 4 enters atmosphere, another part is sent in the drying oven 1, sends into coal pulverizer 2 after being mixed and made into qualified coal pulverizer dry gas with drying oven 1 incendiary high-temperature flue gas, and the primary mixture that comes out from coal pulverizer 2 is after coal collector 3 is collected coal dusts, flue gas enters coal powder fan 4 again, forms the flue gas self-circulation.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although by the utility model being described with reference to preferred embodiment of the present utility model, but those of ordinary skill in the art is to be understood that, can make various changes to it in the form and details, and the spirit and scope of the present utility model that do not depart from appended claims and limited.

Claims (2)

1. coal injection and pulverization of blast furnace flue gas system, it is characterized in that: comprise the drying oven (1), coal pulverizer (2), coal collector (3) and the coal powder fan (4) that are communicated with successively with pipeline, the low-temperature flue gas inlet of described drying oven (1) is communicated with exhaust gas of hot-blast stove pipeline (7) by valve II (6), the vapor pipe of described coal powder fan (4) is divided into two-way, one tunnel logical chimney, another road is inserted on the low-temperature flue gas inlet and the pipeline between the valve II (6) of drying oven (1) by valve I (5).
2. coal injection and pulverization of blast furnace flue gas system according to claim 1 is characterized in that: the pipeline between described exhaust gas of hot-blast stove pipeline (7) and the valve II (6) is provided with induced draft fan (8).
CN2011200150994U 2011-01-18 2011-01-18 Coal injection and pulverization flue gas system for blast furnace Expired - Lifetime CN202007237U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN202007237U true CN202007237U (en) 2011-10-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102174663A (en) * 2011-01-18 2011-09-07 中冶赛迪工程技术股份有限公司 Blast-furnace coal injection pulverization flue gas system and control method thereof
CN106337099A (en) * 2016-09-19 2017-01-18 石横特钢集团有限公司 Low-energy-consumption powder preparing and coal powder injection technological method
CN108441592A (en) * 2018-06-12 2018-08-24 中冶南方工程技术有限公司 A kind of Pulverized Coal Injection System with Fuzzy and technological process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102174663A (en) * 2011-01-18 2011-09-07 中冶赛迪工程技术股份有限公司 Blast-furnace coal injection pulverization flue gas system and control method thereof
CN106337099A (en) * 2016-09-19 2017-01-18 石横特钢集团有限公司 Low-energy-consumption powder preparing and coal powder injection technological method
CN106337099B (en) * 2016-09-19 2017-10-10 石横特钢集团有限公司 The low powder coal spraying process method processed of one kind power consumption
CN108441592A (en) * 2018-06-12 2018-08-24 中冶南方工程技术有限公司 A kind of Pulverized Coal Injection System with Fuzzy and technological process

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AV01 Patent right actively abandoned

Granted publication date: 20111012

Effective date of abandoning: 20130501

RGAV Abandon patent right to avoid regrant