CN112899431A - Production process for improving converter scrap ratio - Google Patents
Production process for improving converter scrap ratio Download PDFInfo
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- CN112899431A CN112899431A CN202110054072.4A CN202110054072A CN112899431A CN 112899431 A CN112899431 A CN 112899431A CN 202110054072 A CN202110054072 A CN 202110054072A CN 112899431 A CN112899431 A CN 112899431A
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- China
- Prior art keywords
- converter
- scrap
- steel
- heat exchange
- feeding
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 239000002918 waste heat Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000033764 rhythmic process Effects 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
-
- 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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a production process for improving the scrap steel ratio of a converter, belonging to the technical field of metallurgy. The method comprises the following steps: feeding, namely feeding the scrap steel to a high-level scrap steel bin; heat exchange, namely exchanging heat of the flue gas waste heat at the high and middle temperature sections of the converter and generating hot air; preheating, namely preheating the scrap steel in a high-level scrap steel bin by using hot air generated by heat exchange; feeding, and adding the preheated scrap steel in the high-level scrap steel bin into the converter in the converter blowing process. The invention fully utilizes the flue gas waste heat of the converter, the waste steel is fed into the converter in the smelting process of the converter, the pressure of adding the waste steel by the converter is reduced, and simultaneously the pollution generated by preheating the waste steel is reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production process for improving the scrap steel ratio of a converter.
Background
With the increase of the steel accumulation in the Chinese society, the supply of the scrap steel in the society increases year by year. Estimated to be 2025 years, the output of scrap steel reaches 2.7-3.0 hundred million tons; by 2030 years, the output of scrap steel reaches 3.2-3.5 hundred million tons. The status of scrap as a steelmaking material will become increasingly important.
About 90% of steel output in China is produced by a long process of blast furnaces and converters, and a large number of steel-making converters are arranged in China. Under the background of increased supply of scrap steel, strict control of carbon emission and high domestic electricity price, the potential of deep digging converter flow to eat scrap steel is a necessary choice for improving the competitiveness of enterprises. Meanwhile, the influence of the price fluctuation of the iron ore on the steel cost can be effectively reduced by flexibly adjusting the proportion of the steel scrap of the converter.
Over the past few years, numerous domestic steel mills have put actual demands on improving scrap ratio and have performed several practices. The existing practice mainly aims to solve the problems of how the scrap steel enters the converter flow and the flow thermal compensation. The main technical scheme at present comprises: the converter scrap ratio is stably improved by implementing the technical schemes.
However, in the prior practice, the offline scrap preheating faces the environmental protection problem of scattered point dust removal and the problem of low chemical heat efficiency of preheating in the converter; besides, the difficulty of adding the scrap steel in front of the furnace is high and the material is easy to block after the amount of the scrap steel is increased. The problems hinder the further improvement of the waste steel ratio of the converter, and meanwhile, the energy consumption index and the environmental protection condition of the existing scheme have a space for improvement.
Disclosure of Invention
In view of the above, the present invention aims to provide a production process for increasing the steel scrap ratio of a converter, which is simple in operation, can fully utilize the residual heat of the flue gas of the converter and reduce the pressure of adding steel scrap in front of the converter, and is an effective means for further increasing the steel scrap ratio of the converter.
In order to achieve the purpose, the invention provides the following technical scheme:
a production process for improving the ratio of converter scrap steel comprises the following steps:
feeding, namely feeding the scrap steel to a high-level scrap steel bin; heat exchange, namely exchanging heat of the flue gas waste heat at the high and middle temperature sections of the converter and generating hot air; preheating, namely preheating the scrap steel in a high-level scrap steel bin by using hot air generated in heat exchange; feeding, and adding the preheated scrap steel in the high-level scrap steel bin into the converter in the converter blowing process.
Optionally, in the step of "feeding", a feeding belt conveyor or a feeding trolley is used for feeding the scrap steel.
Optionally, in the step of "loading", the scrap steel comprises scrap steel broken materials and reinforcing steel bar heads.
Optionally, the broken scrap steel and the reinforcing steel bar head are matched in proportion according to resource conditions and process requirements.
Optionally, in the step of "heat exchange", the flue gas at the high and medium temperature sections of the converter is subjected to dust removal treatment before heat exchange.
Optionally, in the step of "heat exchange", the heat exchange of the flue gas at the high and medium temperature sections of the converter is carried out by adopting a heat exchanger.
Optionally, in the step of "heat exchange", the flue gas in the high and medium temperature sections adopts the same heat exchanger for heat exchange; or the high-temperature section smoke and the medium-temperature section smoke respectively adopt different heat exchangers for heat exchange.
Optionally, in the step of "heat exchange", the temperature of hot air generated by heat exchange is 800 ℃ to 1200 ℃.
Optionally, in the step of preheating, the temperature of the preheated scrap steel is 400-700 DEG C
Alternatively, in the "feeding" step, the scrap is fed directly into the converter via a blanking chute.
Optionally, the blanking chute is correspondingly modified according to the condition of the scrap steel.
Optionally, in the step of "feeding", the high-level scrap bin is formed by reforming the conventional auxiliary bin and a feeding system; or the high-level scrap steel bin is a newly-added bin and a related feeding system.
Optionally, in the step of 'feeding', the feeding rhythm of the scrap steel is matched with the production rhythm of the converter.
Optionally, in the step of "loading", the loading scheme is reasonably selected according to the site conditions of the steelmaking workshop.
The invention has the beneficial effects that: the invention fully utilizes the flue gas waste heat of the converter, and the waste steel is fed into the converter in the smelting process of the converter, thereby reducing the pressure of adding the waste steel in the converter and simultaneously reducing the pollution generated by preheating the waste steel.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a manufacturing process for increasing the scrap ratio of a converter includes the following steps,
s1: feeding scrap steel to a high-level scrap steel bin;
s2: exchanging heat of the flue gas waste heat of the high and medium temperature sections of the converter by using a heat exchanger and generating hot air;
s3: preheating the scrap steel in a high-level scrap steel bin by using hot air generated by heat exchange;
s4: and directly adding the preheated scrap steel in the high-level scrap steel bin into the converter in the converter blowing process.
In step S1, a feeding belt conveyor or a feeding trolley is used to feed the scrap steel, which may be iron-containing materials such as scrap steel broken materials, steel bar heads, and the like. When feeding to a high-level scrap steel bin, a feeding scheme is reasonably selected according to site conditions of a steel-making workshop, and the size of the scrap steel is determined according to the feeding scheme. The waste steel used for feeding is mainly a broken material and a reinforcing steel bar head which can be replaced mutually, and the reinforcing steel bar head has high density, large adding amount and high price; the light and thin material has small density and low price, and the proportion of the light and thin material and the thin material can be flexibly matched according to resource conditions and process requirements. The feeding rhythm of the scrap steel is matched with the production rhythm of the converter. The high-level scrap steel bin and the related feeding system can be newly added, and the high-level scrap steel bin can also be formed by reforming the existing auxiliary bin and the feeding system.
In step S2, the flue gas at the high and middle temperature sections of the converter is dedusted before entering the heat exchanger. The flue gas in the high-temperature section and the middle-temperature section of the converter can use the same heat exchanger or can select different heat exchangers, in the embodiment, the flue gas in the high-temperature section and the flue gas in the middle-temperature section of the converter use the same heat exchanger, and the temperature of hot air generated by the heat exchangers is 800-1200 ℃.
In step S3, heat exchange between the hot air and the steel scrap is achieved by using a forced heat exchange technique, and high-efficiency heat exchange between the hot air and the steel scrap is achieved by forced convection heat exchange.
In step S4, scrap steel is directly added into the converter through a blanking chute, the chute is correspondingly modified according to the condition of the scrap steel, the charging amount and charging time of the scrap steel in a storage bin can be selected according to the blowing process requirement of the converter, the scrap steel can be added at the early stage of converter blowing, a small amount of the scrap steel can be added at the middle and later stages of the blowing, and the temperature of the scrap steel after blanking preheating is 400-700 ℃.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A production process for improving the ratio of converter scrap steel is characterized by comprising the following steps:
feeding, namely feeding the scrap steel to a high-level scrap steel bin;
heat exchange, namely exchanging heat of the flue gas waste heat at the high and middle temperature sections of the converter and generating hot air;
preheating, namely preheating the scrap steel in a high-level scrap steel bin by using hot air generated by heat exchange;
feeding, and adding the preheated scrap steel in the high-level scrap steel bin into the converter in the converter blowing process.
2. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the step of feeding, a feeding belt conveyor or a feeding trolley is used for feeding the scrap steel.
3. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the step of feeding, the waste steel comprises a waste steel broken material and a reinforcing steel bar head.
4. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the step of heat exchange, the flue gas at the high and middle temperature sections of the converter is subjected to dust removal treatment before heat exchange.
5. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the step of heat exchange, the heat exchange of the flue gas at the high and middle temperature sections of the converter is carried out by adopting a heat exchanger.
6. The production process for improving the ratio of converter scrap according to claim 5, characterized in that: in the step of heat exchange, the flue gas in the high and middle temperature sections adopts the same heat exchanger for heat exchange; or the high-temperature section smoke and the medium-temperature section smoke respectively adopt different heat exchangers for heat exchange.
7. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the step of heat exchange, the temperature of hot air generated by heat exchange is 800-1200 ℃.
8. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the preheating step, the temperature of the preheated scrap steel is 400-700 ℃.
9. The production process for improving the ratio of converter scrap according to claim 1, characterized in that: in the feeding step, the scrap steel is directly added into the converter through a blanking chute.
10. The production process for improving the ratio of converter scrap according to claim 3, characterized in that: the broken scrap steel and the reinforcing steel bar head are matched in proportion according to resource conditions and process requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110054072.4A CN112899431A (en) | 2021-01-15 | 2021-01-15 | Production process for improving converter scrap ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110054072.4A CN112899431A (en) | 2021-01-15 | 2021-01-15 | Production process for improving converter scrap ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112899431A true CN112899431A (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110054072.4A Pending CN112899431A (en) | 2021-01-15 | 2021-01-15 | Production process for improving converter scrap ratio |
Country Status (1)
| Country | Link |
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| CN (1) | CN112899431A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114381568A (en) * | 2021-12-02 | 2022-04-22 | 安阳钢铁股份有限公司 | Method for improving converter tapping quantity |
| CN115369204A (en) * | 2022-08-29 | 2022-11-22 | 宝武集团鄂城钢铁有限公司 | Production method for reducing iron-steel ratio |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT7949349A0 (en) * | 1979-06-08 | 1979-06-08 | Nikko Industry | EQUIPMENT FOR PREHEATING MATERIAL TO BE LOADED INTO A STEEL PRODUCTION PLANT |
| DE102008060774A1 (en) * | 2008-12-05 | 2010-07-15 | Raile, Wiktor, Dipl.-Ing. | Scrap preheating process in steel production plants, comprises guiding furnace exhaust gas from melting unit into preheater, which flows through scrap column and preheats the furnace exhaust gas by guidable heat of the furnace exhaust gas |
| CN107190120A (en) * | 2017-07-19 | 2017-09-22 | 沈志军 | The technique and system of steel scrap are heated using converter gas |
| CN107236841A (en) * | 2017-07-31 | 2017-10-10 | 安徽盛博冶金环保科技有限公司 | The heater and heating means of a kind of use converter gas waste-heat steel scrap |
| CN109837359A (en) * | 2019-04-04 | 2019-06-04 | 石家庄巨力科技股份有限公司 | A kind of steel scrap continuous charging system |
| CN209798015U (en) * | 2019-03-12 | 2019-12-17 | 山东泰山钢铁集团有限公司 | Alloy material mixing, preheating and feeding device for converter tapping alloying production |
| CN211084860U (en) * | 2019-10-17 | 2020-07-24 | 山东中能盛节能环保有限公司 | Electric furnace flue gas dust removal device |
-
2021
- 2021-01-15 CN CN202110054072.4A patent/CN112899431A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT7949349A0 (en) * | 1979-06-08 | 1979-06-08 | Nikko Industry | EQUIPMENT FOR PREHEATING MATERIAL TO BE LOADED INTO A STEEL PRODUCTION PLANT |
| DE102008060774A1 (en) * | 2008-12-05 | 2010-07-15 | Raile, Wiktor, Dipl.-Ing. | Scrap preheating process in steel production plants, comprises guiding furnace exhaust gas from melting unit into preheater, which flows through scrap column and preheats the furnace exhaust gas by guidable heat of the furnace exhaust gas |
| CN107190120A (en) * | 2017-07-19 | 2017-09-22 | 沈志军 | The technique and system of steel scrap are heated using converter gas |
| CN107236841A (en) * | 2017-07-31 | 2017-10-10 | 安徽盛博冶金环保科技有限公司 | The heater and heating means of a kind of use converter gas waste-heat steel scrap |
| CN209798015U (en) * | 2019-03-12 | 2019-12-17 | 山东泰山钢铁集团有限公司 | Alloy material mixing, preheating and feeding device for converter tapping alloying production |
| CN109837359A (en) * | 2019-04-04 | 2019-06-04 | 石家庄巨力科技股份有限公司 | A kind of steel scrap continuous charging system |
| CN211084860U (en) * | 2019-10-17 | 2020-07-24 | 山东中能盛节能环保有限公司 | Electric furnace flue gas dust removal device |
Non-Patent Citations (2)
| Title |
|---|
| 万航等: "铁合金生产中的节能——余热利用", 《甘肃冶金》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114381568A (en) * | 2021-12-02 | 2022-04-22 | 安阳钢铁股份有限公司 | Method for improving converter tapping quantity |
| CN115369204A (en) * | 2022-08-29 | 2022-11-22 | 宝武集团鄂城钢铁有限公司 | Production method for reducing iron-steel ratio |
| CN115369204B (en) * | 2022-08-29 | 2024-01-19 | 宝武集团鄂城钢铁有限公司 | Production method for reducing iron-steel ratio |
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Application publication date: 20210604 |
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