CN115029504A - Method for baking materials by using LF (ladle furnace) smoke - Google Patents

Method for baking materials by using LF (ladle furnace) smoke Download PDF

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Publication number
CN115029504A
CN115029504A CN202210735819.7A CN202210735819A CN115029504A CN 115029504 A CN115029504 A CN 115029504A CN 202210735819 A CN202210735819 A CN 202210735819A CN 115029504 A CN115029504 A CN 115029504A
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CN
China
Prior art keywords
flue gas
materials
bin
temperature
temperature flue
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
CN202210735819.7A
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Chinese (zh)
Inventor
黄春灿
武郁璞
郭永谦
孙拓
田云生
王刚
贺书明
杨灵通
宋志宇
陈新文
赵天阳
韩绍根
李聪
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Anyang Iron and Steel Co Ltd
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Anyang 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.)
Filing date
Publication date
Application filed by Anyang Iron and Steel Co Ltd filed Critical Anyang Iron and Steel Co Ltd
Priority to CN202210735819.7A priority Critical patent/CN115029504A/en
Publication of CN115029504A publication Critical patent/CN115029504A/en
Pending legal-status Critical Current

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    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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
    • C21C2100/02—Treatment of the exhaust gas
    • 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
    • C21C2100/06—Energy from waste gas used in other processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The application provides a method for baking materials by using LF (ladle furnace) smoke, which specifically comprises the following steps: collecting high-temperature flue gas generated by LF, and introducing the collected high-temperature flue gas into the pipeline; feeding the high-temperature flue gas into a material bin needing to be heated through a pipeline; heat exchange is carried out between the high-temperature flue gas in the storage bin and the materials; high-temperature flue gas for heat exchange is discharged to a dust removal system from an outlet, and relates to the technical field of metallurgy.

Description

Method for baking materials by using LF (ladle furnace) flue gas
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for baking materials by using LF (ladle furnace) smoke.
Background
Metallurgy is the process and technology of extracting metals or metal compounds from minerals to produce metallic materials with certain properties by various processing methods. Metallurgy has a long history of development, from the stoneware age to the subsequent bronze age, to the large-scale development of modern steel smelting. The history of human development fused the history of metallurgical development.
The metallurgy technology mainly comprises pyrometallurgical gold smelting, hydrometallurgy and electrometallurgy. With the successful application of physical chemistry in metallurgy, metallurgy goes from technology to science, and thus has the metallurgical engineering specialty in universities.
In the steelmaking process, the dry material with higher temperature usually has less water content, and when the material is used in the slag-making or alloying process of the LF furnace, the hydrogen content brought into molten steel by slag or alloy materials can be effectively reduced, so that the purpose of reducing the hydrogen content in a steel plate is achieved, and the internal quality of the steel plate is better supported; meanwhile, the material temperature is higher, so that the heat absorbed from the molten steel is relatively less, and the power consumption in the refining process can be saved. In the LF smelting process, a large amount of high-temperature flue gas can be generated, and the flue gas is pumped into a dust removal system to be discharged by a general treatment method, so that energy waste is formed.
Disclosure of Invention
In order to overcome the problem that a large amount of high-temperature flue gas is generated in the existing LF smelting process, the flue gas is pumped into a dust removal system to be discharged to form energy waste, the LF furnace adopts a hot blast stove, an air inlet pipe is arranged below a bin shell, the high-temperature flue gas generated in the smelting process enters the bin shell through the air inlet pipe to complete heat exchange with internal materials, and the flue gas overflows from a smoke outlet above and enters the dust removal system to remove dust.
The technical scheme adopted by the embodiment of the application for solving the technical problem is as follows:
a method for baking materials by using LF (ladle furnace) smoke comprises the following steps:
step one, collecting high-temperature flue gas generated by LF, and introducing the collected high-temperature flue gas into the pipeline;
secondly, feeding the high-temperature flue gas into a material bin needing to be heated through a pipeline;
step three, performing heat exchange between the high-temperature flue gas in the bin and the materials;
and step four, discharging the high-temperature flue gas subjected to heat exchange to a dust removal system from an outlet.
Preferably, the temperature of the high-temperature flue gas in the first step is 250-400 ℃.
Preferably, the high-temperature flue gas in the first step is collected by a flue gas duct.
Preferably, the materials in the silo in the second step are mainly lime, fluorite and ferro-silico-manganese alloy.
Preferably, the bottom or the lower part of the bin in the third step is provided with a flue gas inlet, and an exhaust port is arranged above the bin and is used for exhausting the flue gas into a dust removal system.
Preferably, the temperature of the materials subjected to heat exchange in the third step is 100-150 ℃.
The device comprises an LF (ladle furnace), a heat exchanger and a control system, wherein the LF is of a hollow structure and is used for placing materials to be subjected to heat exchange; wherein, the LF stove includes the feed bin casing, and feed bin casing inside is equipped with the insulating layer, the inside of insulating layer is equipped with pours the layer.
Preferably, the upper surface of feed bin casing is equipped with the outlet flue, the lower surface of feed bin casing inlays and is equipped with the air brick, adopts the air brick, can be so that the high temperature flue gas from inside entering into the feed bin casing of air brick to the problem emergence of leaking can not appear in the inside material of feed bin casing, and the lower surface of air brick is equipped with the intake pipe.
Preferably, the lower part of the bin shell is provided with a supporting leg, and the supporting leg can support the whole bin shell.
Preferably, a connecting pipeline is arranged above the smoke outlet and is connected with the dust removal system, so that the discharged smoke is subjected to dust removal and purification by the dust removal system, and air pollution is avoided.
The embodiment of the application has the advantages that:
the LF furnace adopts a hot blast furnace, and the structure of the LF furnace is as follows from outside to inside: feed bin casing, insulating layer and pouring layer, the inboard space that is the splendid attire material of pouring layer, and the below of feed bin casing is equipped with the intake pipe, the high temperature flue gas that produces in the smelting process passes through the intake pipe and gets into the feed bin casing from feed bin casing bottom like this, accomplish heat exchange with the inside material of feed bin casing, the flue gas spills over from the outlet flue of feed bin casing top and gets into dust pelletizing system and remove dust, can reach the purpose of toasting the material through this kind of mode, and effectively avoided important materials such as lime to absorb water and wet the increase hydrogen phenomenon, reach stable product quality, reduce the material from purposes such as molten steel heat absorption capacity.
Drawings
FIG. 1 is a schematic cross-sectional structure diagram of an LF furnace of the invention;
FIG. 2 is a schematic diagram showing the comparison of hydrogen content in the same 150tLF finished low alloy steel product.
Description of the main reference numerals:
1. a bin housing; 2. an air inlet pipe; 3. air brick; 4. a smoke outlet; 5. pouring a layer; 6. a thermal insulation layer; 7. and (7) supporting legs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention. In addition, for the convenience of description, the terms "upper", "lower", "left" and "right" are used to refer to the same direction as the upper, lower, left, right, etc. of the drawings, and the terms "first", "second", etc. are used for descriptive distinction and have no special meaning.
The embodiment of the application provides a method for baking materials by using LF (ladle furnace) smoke, and solves the problems that in the prior art, a large amount of high-temperature smoke is generated in the LF smelting process, and the smoke is pumped into a dust removal system to be discharged to cause energy waste.
In order to solve the above problems, the technical solution in the embodiment of the present application has the following general idea:
examples
Take 150t LF furnace smelting process as an example.
The LF furnace adopts a hot blast furnace, and the structure of the hot blast furnace is as follows: feed bin casing 1, insulating layer 6 and pouring layer 5, 5 inboard spaces for splendid attire material in pouring layer, and the below of feed bin casing 1 is equipped with intake pipe 2, high temperature flue gas that produces in the smelting process passes through intake pipe 2 and gets into feed bin casing 1 from 1 bottom of feed bin casing, accomplish heat exchange with the inside material of feed bin casing 1, the flue gas spills over from the outlet flue 4 of feed bin casing 1 top and gets into dust pelletizing system and remove dust, can reach the purpose of toasting the material through this kind of mode, and effectively avoided important materials such as lime to absorb water and wet the increase hydrogen phenomenon, reach stable product quality, reduce purposes such as material from molten steel endotherm.
A smoke generating method of a 150t LF furnace in a smelting process mainly comprises the steps of blowing argon at the bottom of a steel ladle, blowing gas overflowing along with argon bubbles in molten steel and the like, wherein the general temperature is 300-400 ℃, generated high-temperature smoke enters the stock bin shell 1 from the bottom of the stock bin shell 1 through a pipeline, heat exchange is completed in the stock bin shell 1, the smoke overflows from a smoke outlet 4 above the stock bin shell 1 and enters a dust removal system, and the purpose of baking materials can be achieved through the mode.
According to measurement, the temperature of the lime baked by the hot blast stove can reach 100-150 ℃, the phenomena that important materials such as lime absorb water, are damped and increase hydrogen are effectively avoided, and the purposes of stabilizing the product quality, reducing the heat absorption capacity of the materials from molten steel and the like are achieved.
Comparative example
Take 150t LF furnace smelting without the invention as an example.
The 150t LF furnace is not adopted, and the smoke dust generated in the smelting process directly enters a dust removal system through a pipeline. The storage bin shell 1 adopted by the LF furnace is a bin body formed by welding steel plates, materials are easy to absorb water at normal temperature in the bin, and enter the furnace from the storage bin shell 1 for slagging or alloying, so that the hydrogen carrying amount of the materials into molten steel is increased, and the stable control of the performance of the steel plates is not facilitated.
Compared with the comparative example, the temperature of the material in the example 1 is 100-150 ℃, the temperature is higher, the material is not easy to absorb water after being dried, and the hydrogen content brought into the molten steel by the material can be reduced when the material is added into the molten steel, which can be seen in fig. 2, when the low alloy steel is smelted, the hydrogen content of the finished sample is 0.00026% on average, when the low alloy steel smelted by the method is not adopted before the bin is reformed, the hydrogen content of the finished sample is 0.00040% on average, the hydrogen content of the finished sample is 0.00014% on average, and the effect is obvious.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (10)

1. The method for roasting materials by using the LF flue gas is characterized by comprising the following specific steps of:
step one, collecting high-temperature flue gas generated by LF, and introducing the collected high-temperature flue gas into the pipeline;
secondly, feeding the high-temperature flue gas into a material bin needing to be heated through a pipeline;
step three, performing heat exchange between the high-temperature flue gas in the bin and the materials;
and step four, discharging the high-temperature flue gas subjected to heat exchange to a dust removal system from an outlet.
2. The method for roasting materials by using LF flue gas as claimed in claim 1, wherein the temperature of the high-temperature flue gas in the first step is 250-400 ℃.
3. The method for roasting materials by using LF flue gas as claimed in claim 1, wherein the manner of high temperature flue gas collection in the first step adopts flue gas duct collection.
4. The method for roasting materials by using LF flue gas as claimed in claim 1, wherein the materials inside the silo in the second step are mainly lime, fluorite and silicon manganese iron alloy.
5. The method for roasting materials by using LF flue gas as claimed in claim 1, wherein the bottom or lower part of the bin in the third step is provided with a flue gas inlet, and an exhaust port is arranged above the bin to enter the dust removal system.
6. The method for roasting materials by using LF flue gas as claimed in claim 1, wherein the temperature of the heat-exchanged materials in the third step is 100-150 ℃.
7. The device for roasting materials by using LF flue gas as claimed in claim 1, comprising an LF furnace which is a hollow structure and is used for placing materials to be subjected to heat exchange; wherein, the LF stove includes feed bin casing (1), and feed bin casing (1) is inside to be equipped with insulating layer (6), the inside of insulating layer (6) is equipped with pours layer (5).
8. The device for roasting materials by using LF flue gas as claimed in claim 7, wherein the upper surface of the bin housing (1) is provided with a smoke outlet (4), the lower surface of the bin housing (1) is embedded with air bricks (3), and the lower surface of the air bricks (3) is provided with an air inlet pipe (2).
9. The device for roasting materials by using LF flue gas as claimed in claim 7, wherein the bin housing (1) is provided with legs (7) below.
10. The device for roasting materials by using LF flue gas as claimed in claims 1-8, wherein a connecting pipe is arranged above the flue gas outlet (4), and the connecting pipe is connected with a dust removal system.
CN202210735819.7A 2022-06-27 2022-06-27 Method for baking materials by using LF (ladle furnace) smoke Pending CN115029504A (en)

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CN202210735819.7A CN115029504A (en) 2022-06-27 2022-06-27 Method for baking materials by using LF (ladle furnace) smoke

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274387A (en) * 2007-05-07 2008-11-13 Jfe Steel Kk Method for melting cr-containing low alloy steel
CN204385232U (en) * 2014-12-06 2015-06-10 黑龙江建龙钢铁有限公司 Lf ladle refining furnace
CN208378928U (en) * 2018-05-25 2019-01-15 中冶南方工程技术有限公司 It is a kind of can Smoke prevention LF furnace charging system
CN111518986A (en) * 2020-05-27 2020-08-11 沈阳东大山汇环境科技有限公司 System for smelting scrap steel by utilizing primary combustion heat energy and steelmaking method thereof
CN111560490A (en) * 2020-05-12 2020-08-21 首钢集团有限公司 Alloy baking material and baking method and application thereof
CN216337783U (en) * 2021-11-29 2022-04-19 中冶京诚工程技术有限公司 Alloy baking and conveying device of refining furnace

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274387A (en) * 2007-05-07 2008-11-13 Jfe Steel Kk Method for melting cr-containing low alloy steel
CN204385232U (en) * 2014-12-06 2015-06-10 黑龙江建龙钢铁有限公司 Lf ladle refining furnace
CN208378928U (en) * 2018-05-25 2019-01-15 中冶南方工程技术有限公司 It is a kind of can Smoke prevention LF furnace charging system
CN111560490A (en) * 2020-05-12 2020-08-21 首钢集团有限公司 Alloy baking material and baking method and application thereof
CN111518986A (en) * 2020-05-27 2020-08-11 沈阳东大山汇环境科技有限公司 System for smelting scrap steel by utilizing primary combustion heat energy and steelmaking method thereof
CN216337783U (en) * 2021-11-29 2022-04-19 中冶京诚工程技术有限公司 Alloy baking and conveying device of refining furnace

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