CN110129511A - A method of improving RECOVERY OF CONVERTER GAS amount and calorific value - Google Patents

A method of improving RECOVERY OF CONVERTER GAS amount and calorific value Download PDF

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Publication number
CN110129511A
CN110129511A CN201910317267.6A CN201910317267A CN110129511A CN 110129511 A CN110129511 A CN 110129511A CN 201910317267 A CN201910317267 A CN 201910317267A CN 110129511 A CN110129511 A CN 110129511A
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CN
China
Prior art keywords
converter
gas
calorific value
blowing
oxygen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910317267.6A
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Chinese (zh)
Inventor
吉立鹏
罗磊
张丙龙
曾卫民
吴耀春
赵长亮
黄财德
马强
关顺宽
丁剑
何文远
李仕儒
郭小龙
边吉明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Jingtang United Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Shougang Jingtang United Iron and Steel Co Ltd filed Critical Shougang Jingtang United Iron and Steel Co Ltd
Priority to CN201910317267.6A priority Critical patent/CN110129511A/en
Publication of CN110129511A publication Critical patent/CN110129511A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/04—Recirculation of the exhaust gas

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The present invention relates to a kind of methods for improving RECOVERY OF CONVERTER GAS amount and calorific value, include the following steps: S1, preparation and handle CO2 gas；S2, the CO2 gas of the processing is continually fed into bottom-blowing of converter general pipeline and oxygen general pipeline respectively；S3, measurement coal gas of converter, by mass percentage, CO >=13% and when O2 < 1% in the coal gas of converter recycle the coal gas of converter, and CO≤9% or when O2 > 1% in the coal gas of converter terminates the RECOVERY OF CONVERTER GAS.

Description

A method of improving RECOVERY OF CONVERTER GAS amount and calorific value
Technical field
The invention belongs to steelmaking technical field, in particular to a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value.
Background technique
The flue gas containing a large amount of CO generated during bessemerizing is known as coal gas of converter, in existing converter smelting mode, Because using inert gas as bottom blowing gas source, dilute the CO concentration in coal gas of converter, cause in coal gas of converter yield and Therefore the reduction of calorific value to improve RECOVERY OF CONVERTER GAS amount and calorific value, needs to reduce inert gas bottom blowing consumption, however, lazy Property gas bottom blowing consumption reduction, it is insufficient to will cause bottom blowing stirring kinetic energy, to influence metallurgical effect.
Therefore, this field needs a kind of method, can not reduce inert gas bottom blowing consumption and improve coal gas of converter and return Receipts amount and calorific value.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind The method for stating a kind of the raising RECOVERY OF CONVERTER GAS amount and calorific value of problem.
The embodiment of the present invention provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, preparation simultaneously handle CO2Gas；
S2, by the CO of the processing2Gas is continually fed into bottom-blowing of converter general pipeline and oxygen general pipeline respectively；
S3, measurement coal gas of converter, by mass percentage, CO >=13% and O in the coal gas of converter2When < 1%, to institute It states coal gas of converter to be recycled, CO≤9% or O in the coal gas of converter2When > 1%, the RECOVERY OF CONVERTER GAS is terminated.
Further, in S1, the processing CO2When gas, by the CO2Gas heating boosts to 1.8- to >=15 DEG C 3.0Mpa。
Further, in S2, the CO2When gas is passed through the bottom-blowing of converter general pipeline, inert gas bottom blowing pipeline is cut off, Carry out CO2Bottom blowing.
Further, the inert gas is N2And/or Ar.
Further, in S2, in the oxygen general pipeline, the CO that is passed through2Quality≤O2The 10% of quality.
Further, in S2, the CO2Gas is passed through during the oxygen general pipeline, complete in converter plus steel scrap and iron making Cheng Hou carries out oxygen rifle blowing.
Further, in the oxygen rifle converting process, dedusting fan revolving speed aperture is 80-90%.
One or more technical solutions in the embodiment of the present invention, have at least the following technical effects or advantages:
Method provided by the present application, by the CO of processing2Gas is continually fed into bottom-blowing of converter general pipeline and oxygen general pipeline respectively, with CO2Bottom blowing replaces inert gas bottom blowing, it is therefore intended that improves RECOVERY OF CONVERTER GAS concentration and increases bottom blowing stirring effect (bottom of because of Blow 1m3Ar or N2Into in converter, final 1m3Ar or N2Entered in flue gas by iron liquid；And bottom blowing 1m3CO2After in into converter, CO2Production 2m is reacted with the C in iron liquid3CO not only increases coal-gas recovering amount, and increases bottom blowing stirring kinetic energy.)；Consider To the safety and equipment operation stability of gas recovery, when to RECOVERY OF CONVERTER GAS, by mass percentage, the converter coal CO >=13% and O in gas2When < 1%, the coal gas of converter is recycled, CO≤9% or O in the coal gas of converter2> 1% When, terminate the RECOVERY OF CONVERTER GAS.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through Market is commercially available or can be prepared by existing method.
The application provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, preparation simultaneously handle CO2Gas；
S2, by the CO of the processing2Gas is continually fed into bottom-blowing of converter general pipeline and oxygen general pipeline respectively；
S3, measurement coal gas of converter, by mass percentage, CO >=13% and O in the coal gas of converter2When < 1%, to institute It states coal gas of converter to be recycled, CO≤9% or O in the coal gas of converter2When > 1%, the RECOVERY OF CONVERTER GAS is terminated.
In the application S1, the processing CO2When gas, by the CO2Gas heating boosts to 1.8- to >=15 DEG C 3.0Mpa。
In the application S2, the CO2When gas is passed through the bottom-blowing of converter general pipeline, inert gas bottom blowing pipeline is cut off, into Row CO2Bottom blowing.
Preferably, the inert gas is N2And/or Ar.
In the application S2, in the oxygen general pipeline, the CO that is passed through2Quality≤O2The 10% of quality.
In the application S2, the CO2Gas is passed through during the oxygen general pipeline, is completed in converter plus steel scrap and iron making Afterwards, oxygen rifle blowing is carried out.
Preferably, in the oxygen rifle converting process, dedusting fan revolving speed aperture is 80-90%.
To the raising RECOVERY OF CONVERTER GAS amount of the application and coal-gas recovering is corresponded to below in conjunction with five specific embodiments Method is described in detail.
Embodiment 1
The present invention provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, processing CO2Gas, by the CO2Gas heating boosts to 3.0Mpa to >=15 DEG C；
S2, the CO for obtaining the processing2Gas is divided into two-way, wherein is incorporated to bottom-blowing of converter general pipeline all the way, cuts off bottom blowing Inert gas piping, bottom blowing CO2It maintains a normally open, CO2Bottom blowing flow is 400m3/ h, another way are incorporated to oxygen general pipeline, wherein oxygen Flow is 60000m3/ h, top blast are mixed into CO2Flow is 6000m3/h；
S3, after the completion of converter adds steel scrap and iron making, carry out oxygen rifle blowing, wherein dedusting fan revolving speed aperture be 85%；
S4, by mass percentage, as CO >=13% in converter waste gas and O2When < 1%, recycling coal gas of converter is carried out；When CO≤9% or O in converter waste gas2When > 1%, recycling coal gas of converter is terminated.
Embodiment 2
The present invention provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, processing CO2Gas, by the CO2Gas heating boosts to 2.5Mpa to 20 DEG C；
S2, the CO for obtaining the processing2Gas is divided into two-way, wherein is incorporated to bottom-blowing of converter general pipeline all the way, cuts off bottom blowing Inert gas piping, bottom blowing CO2It maintains a normally open, CO2Bottom blowing flow is 400m3/ h, another way are incorporated to oxygen general pipeline, wherein oxygen Flow is 60000m3/ h, top blast are mixed into CO2Flow is 5000m3/h；
S3, after the completion of converter adds steel scrap and iron making, carry out oxygen rifle blowing, wherein dedusting fan revolving speed aperture be 80%；
S4, by mass percentage, as CO >=13% in converter waste gas and O2When < 1%, recycling coal gas of converter is carried out；When CO≤9% or O in converter waste gas2When > 1%, recycling coal gas of converter is terminated.
Embodiment 3
The present invention provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, processing CO2Gas, by the CO2Gas heating boosts to 1.8Mpa to 25 DEG C；
S2, the CO for obtaining the processing2Gas is divided into two-way, wherein is incorporated to bottom-blowing of converter general pipeline all the way, cuts off bottom blowing Inert gas piping, bottom blowing CO2It maintains a normally open, CO2Bottom blowing flow is 400m3/ h, another way are incorporated to oxygen general pipeline, wherein oxygen Flow is 60000m3/ h, it is 4000m that top blast, which is mixed into CO2 flow,3/h；
S3, after the completion of converter adds steel scrap and iron making, carry out oxygen rifle blowing, wherein dedusting fan revolving speed aperture be 90%；
S4, by mass percentage, as CO >=13% in converter waste gas and O2When < 1%, recycling coal gas of converter is carried out；When CO≤9% or O in converter waste gas2When > 1%, recycling coal gas of converter is terminated.
Comparative example 1
RECOVERY OF CONVERTER GAS amount technique, includes the following steps:
S1, bottom-blowing of converter Ar gas, top blast oxygen；
S2, bottom blowing Ar are maintained a normally open, and Ar bottom blowing flow is 400m3/ h, top blast oxygen, oxygen flow 60000m3/h；
S3, after the completion of converter adds steel scrap and iron making, carry out oxygen rifle blowing, wherein dedusting fan revolving speed aperture be 85%；
S4, by mass percentage, as CO >=13% in converter waste gas and O2When < 1%, recycling coal gas of converter is carried out；When CO≤9% or O in converter waste gas2When > 1%, recycling coal gas of converter is terminated.
Comparative example 2
The present invention provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, bottom-blowing of converter bottom blowing early period N2Gas, later period bottom blowing Ar gas, top blast oxygen；
3min bottom blowing N before S2, blowing2, bottom blowing flow is 400m3/ h, later period 9min bottom blowing Ar gas, bottom blowing flow are 400m3/ h, top blast oxygen, oxygen flow 60000m3/h；
S3, after the completion of converter adds steel scrap and iron making, carry out oxygen rifle blowing, wherein dedusting fan revolving speed aperture be 85%；
S4, by mass percentage, as CO >=13% in converter waste gas and O2When < 1%, recycling coal gas of converter is carried out；When CO≤9% or O in converter waste gas2When > 1%, recycling coal gas of converter is terminated.
Comparative example 3
The present invention provides a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, includes the following steps:
S1, bottom-blowing of converter N2Gas, top blast oxygen；
S2, bottom blowing N2It maintains a normally open, N2Bottom blowing flow is 400m3/ h, top blast oxygen, oxygen flow 60000m3/h；
S3, after the completion of converter adds steel scrap and iron making, carry out oxygen rifle blowing, wherein dedusting fan revolving speed aperture be 98%；
S4, by mass percentage, as CO >=13% in converter waste gas and O2When < 1%, recycling coal gas of converter is carried out；When CO≤9% or O in converter waste gas2When > 1%, recycling coal gas of converter is terminated.
In embodiment 1-3 and comparative example 1-3, RECOVERY OF CONVERTER GAS amount and calorific value are as shown in table 1:
Table 1
Embodiment RECOVERY OF CONVERTER GAS amount (M3/T) CO content (%) in coal gas of converter
Embodiment 1 123 56
Embodiment 2 122 55
Embodiment 3 120 54
Comparative example 1 110 52
Comparative example 2 109 52
Comparative example 3 108 51
Compared with prior art, the present processes have the following characteristics that
(1) 10% or so can be increased using the present processes coal-gas recovering amount.
(2) 2% or so can be increased using the present processes coal gas of converter CO content.
Finally, it is to be noted that, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive Property include so that include a series of elements process, method, article or equipment not only include those elements, but also Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic Element.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (7)

1. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value, which comprises the steps of:
S1, preparation simultaneously handle CO2Gas；
S2, by the CO of the processing2Gas is continually fed into bottom-blowing of converter general pipeline and oxygen general pipeline respectively；
S3, measurement coal gas of converter, by mass percentage, CO >=13% and O in the coal gas of converter2When < 1%, to described turn Producer gas is recycled, CO≤9% or O in the coal gas of converter2When > 1%, the RECOVERY OF CONVERTER GAS is terminated.
2. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value according to claim 1, which is characterized in that in S1, The processing CO2When gas, by the CO2Gas heating boosts to 1.8-3.0Mpa to >=15 DEG C.
3. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value according to claim 1, which is characterized in that in S2, The CO2When gas is passed through the bottom-blowing of converter general pipeline, inert gas bottom blowing pipeline is cut off, carries out CO2Bottom blowing.
4. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value according to claim 3, which is characterized in that described lazy Property gas be N2And/or Ar.
5. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value according to claim 1, which is characterized in that in S2, In the oxygen general pipeline, the CO that is passed through2Quality≤O2The 10% of quality.
6. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value according to claim 1, which is characterized in that in S2, The CO2Gas is passed through during the oxygen general pipeline, after the completion of converter plus steel scrap and iron making, carries out oxygen rifle blowing.
7. a kind of method for improving RECOVERY OF CONVERTER GAS amount and calorific value according to claim 6, which is characterized in that the oxygen In rifle converting process, dedusting fan revolving speed aperture is 80-90%.
CN201910317267.6A 2019-04-19 2019-04-19 A method of improving RECOVERY OF CONVERTER GAS amount and calorific value Pending CN110129511A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111020101A (en) * 2019-11-29 2020-04-17 山东莱钢永锋钢铁有限公司 Method for controlling recovery termination of converter gas
CN111961797A (en) * 2020-09-16 2020-11-20 攀钢集团研究院有限公司 Method for increasing CO content in semisteel steelmaking converter gas
CN111961796A (en) * 2020-09-16 2020-11-20 攀钢集团研究院有限公司 Method for increasing CO content in vanadium extraction converter gas

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CN107604123A (en) * 2017-08-17 2018-01-19 王虎 A kind of method for effectively improving RECOVERY OF CONVERTER GAS quality and quantity
CN108707718A (en) * 2018-06-14 2018-10-26 鞍钢股份有限公司 It is a kind of using high temperature coal gas of converter and to improve the device and its application method of calorific value

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CN102864273A (en) * 2012-10-18 2013-01-09 吉林建龙钢铁有限责任公司 Method for increasing converter gas CO recycling amount
CN107604123A (en) * 2017-08-17 2018-01-19 王虎 A kind of method for effectively improving RECOVERY OF CONVERTER GAS quality and quantity
CN108707718A (en) * 2018-06-14 2018-10-26 鞍钢股份有限公司 It is a kind of using high temperature coal gas of converter and to improve the device and its application method of calorific value

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111020101A (en) * 2019-11-29 2020-04-17 山东莱钢永锋钢铁有限公司 Method for controlling recovery termination of converter gas
CN111961797A (en) * 2020-09-16 2020-11-20 攀钢集团研究院有限公司 Method for increasing CO content in semisteel steelmaking converter gas
CN111961796A (en) * 2020-09-16 2020-11-20 攀钢集团研究院有限公司 Method for increasing CO content in vanadium extraction converter gas

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Application publication date: 20190816