CN112430700A - Converter gas full recovery device and recovery method thereof - Google Patents
Converter gas full recovery device and recovery method thereof Download PDFInfo
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- CN112430700A CN112430700A CN202011121480.9A CN202011121480A CN112430700A CN 112430700 A CN112430700 A CN 112430700A CN 202011121480 A CN202011121480 A CN 202011121480A CN 112430700 A CN112430700 A CN 112430700A
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- 238000011084 recovery Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims description 18
- 230000000740 bleeding effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 3
- 238000001514 detection method Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 17
- 239000010959 steel Substances 0.000 abstract description 17
- 239000003034 coal gas Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 89
- 238000009841 combustion method Methods 0.000 description 9
- 238000003723 Smelting Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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
- 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
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- 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
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A converter gas full recovery device and a recovery method thereof comprise a converter, a dust removal device, a four-way valve, a gas chamber, a pressurizing station, a diffusing tower and a user side; a plurality of flowmeters and concentration meters are arranged on the pipeline between the dust removing device and the four-way valve, and each pipeline is provided with a control valve. The converter gas full recovery device and the recovery method thereof provided by the invention can theoretically and completely recover converter gas generated by a converter under the premise that the existing production process conditions are unchanged and the production quality and yield of molten steel are not influenced, so that the converter gas generation amount is equal to the recovery amount, and more converter gas recovered can be used for a gas boiler and furnace power generation under the condition that the gas consumption at the gas consumption end of a steel mill is unchanged, thereby creating huge economic benefits for the steel mill. And because the coal gas is completely recycled, the ignition and the diffusion of unqualified coal gas are avoided, and great environmental protection benefits are brought.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of smelting automation, in particular to a converter gas full recovery device and a recovery method thereof.
[ background of the invention ]
At present, two gas treatment processes exist in the converter steelmaking process, one is a combustion method, and the other is an unburned method. The combustion method is mainly used for combusting the converter gas under the condition of poor converter gas recovery process, and the combustion method is not used due to rapid development and progress of the converter gas recovery process at present. The non-combustion method is gradually applied and popularized from the 70 th of the 20 th century, and the past combustion method is completely replaced by the non-combustion method at present. The non-combustion method represents a great advance over the combustion method. From the perspective of energy utilization, the combustion method only focuses on waste heat of the waste heat boiler, and the unburned method additionally recovers the heat of the converter gas. In any of the above methods, the rules are clear: when the content of CO and the content of O2 in the converter gas do not reach the specified indexes, the converter gas generated by converter steelmaking cannot be recovered, and only can be ignited and diffused through a diffusing tower.
Referring to fig. 1 and fig. 2, a traditional converter gas recovery process flow and a converter gas dynamic recovery amount calculation formula are given, wherein Tch in the formula is the blowing time of the converter; tch1, Tch2 and Tch3 are respectively the blowing early stage, the blowing middle stage and the blowing end stage, and Tch is Tch1+ Tch2+ Tch 3;
the lower limit of the volume fraction of CO in the coal gas recovery condition; tch,0 is the moment when oxygen blowing starts;
is the maximum volume fraction of CO;
is the volume fraction of CO;
is O2Volume fraction of (a);
for O in the coal gas recovery conditions2Volume fraction upper limit.
As can be seen from the formula in FIG. 2, converter gas is not recovered throughout the smelting process under the conventional conditions. But the converter gas is in a recovery state in the middle three periods, the recovery amount of the converter gas at other times is 0, and the converter gas in the three periods is released in the recovery process, which is undoubtedly a huge waste for the energy utilization of the current iron and steel enterprises.
Therefore, the problem to be solved in the field is to provide a converter gas full recovery device and a recovery method thereof.
[ summary of the invention ]
Aiming at the problems, the invention provides a converter gas full recovery device and a recovery method thereof, wherein the converter gas full recovery device comprises a converter, a dust removal device, a four-way valve, a gas chamber, a pressurizing station, a bleeding tower and a user side, wherein the converter is connected with the dust removal device through a pipeline, the gas chamber is connected with the pressurizing station through a pipeline, the pressurizing station is connected with the user side through a pipeline, three interfaces of the four-way valve are respectively connected with the dust removal device, the gas chamber and the bleeding tower, in addition, the other interface of the four-way valve is connected with two pipelines, one of the two pipelines is connected between the dust removal device and the four-way valve, and the other pipeline is connected; and a plurality of flowmeters and concentration meters are arranged on a pipeline between the dust removal device and the four-way valve, and a control valve is arranged on each pipeline.
Further, the pipelines are named as L1 section-L8 section respectively, wherein the L1 section is provided with a first flowmeter and a first concentration meter; wherein a first flowmeter and a second concentration meter are arranged on the L3 section of pipeline; a first flowmeter and a third concentration meter are arranged on the L2 section of pipeline; section L7 is equipped with a fourth flow meter and a fourth concentration meter.
Furthermore, the flowmeter and the concentration meter are both provided with RS485 communication.
A recovery method based on the full recovery device of converter gas as claimed in claim 1, wherein in the middle stage of blowing, converter gas generated by a converter enters an L1-stage pipeline after passing through a dust removal device, pressure and concentration are detected by a first flowmeter and a first concentration meter which are installed on an L1-stage pipeline, the concentration reaches the standard, the converter gas sequentially enters a gas holder through an L2 stage and an L3 stage, then the converter gas is pressurized by a pressurizing station and then is conveyed to a user end through an L7-stage pipeline, in the initial stage and the final stage of blowing, the concentration does not reach the standard as detected by the first flowmeter and the first concentration meter on an L1-stage pipeline, the converter gas enters an L6 stage after passing through an L2 stage, the converter gas with high concentration stored in the gas holder passes through an L7 stage and then is mixed with the converter gas which does not reach the standard in the L6 stage in an L3 stage, then the converter gas which passes through an L3 stage, is mixed with the converter gas in an L1 stage, and then the concentration and the converter gas are detected by a, after reaching the standard, the concentration is transported to a user end (7) for use through L4 section and L8 section.
Further, the calculation formula of the concentration and the flow rate of the converter gas mixed in the section L2 is as follows:
compared with the prior art, the invention has the following beneficial effects:
the converter gas full recovery device and the recovery method thereof provided by the invention can theoretically and completely recover converter gas generated by a converter under the premise that the existing production process conditions are unchanged and the production quality and yield of molten steel are not influenced, so that the converter gas generation amount is equal to the recovery amount, and more converter gas recovered can be used for a gas boiler and furnace power generation under the condition that the gas consumption at the gas consumption end of a steel mill is unchanged, thereby creating huge economic benefits for the steel mill. And because the coal gas is completely recycled, the ignition and the diffusion of unqualified coal gas are avoided, and great environmental protection benefits are brought.
[ description of the drawings ]
FIG. 1 is a diagram of a conventional converter gas recovery process.
FIG. 2 is a formula for calculating the dynamic recovery of converter gas.
FIG. 3 is a schematic structural diagram of a converter gas full recovery device of the present invention.
FIG. 4 is a schematic view of the installation of the flow meter and concentration meter of the present invention.
[ detailed description ] embodiments
The directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are only used to explain and illustrate the present invention, but not to limit the scope of the present invention.
In the traditional process, the converter gas generated by the converter has low CO concentration and high oxygen concentration content at the initial stage, so the converter gas does not meet the recovery standard and cannot be directly used; after a period of time, the CO concentration gradually rises, the converter gas can reach the recovery standard, and the converter gas which does not reach the recovery standard can be ignited only through the diffusing tower, so that the energy waste is caused.
Referring to fig. 3, a schematic structural diagram of a converter gas full recovery device of the present invention is shown, which includes a converter 1, a dust removal device 2, a four-way valve 3, a gas chamber 4, a pressurization station 5, a bleeding tower 6 and a user terminal 7, wherein the converter 1 and the dust removal device 2 are connected through a pipeline, the gas chamber 4 and the pressurization station 5 are connected through a pipeline, the pressurization station 5 and the user terminal 7 are connected through a pipeline, three interfaces of the four-way valve 3 are respectively connected with the dust removal device 2, the gas chamber 4 and the bleeding tower 6, in addition, another interface of the four-way valve is connected with two pipelines, one of the two pipelines is connected between the dust removal device 2 and the four-way valve 3, and the other is connected between; and a plurality of flowmeters and concentration meters are arranged on the pipeline between the dust removal device 2 and the four-way valve 3, and each pipeline is provided with a control valve.
Referring to fig. 3 and 4, the pipeline connection diagram of the invention is given, and each pipeline is named as L1 segment-L8 segment, wherein L1 segment is provided with a first flowmeter 8 and a first concentration meter 9; wherein a first flowmeter 10 and a second concentration meter 11 are arranged on the L3 pipeline; a third flowmeter 12 and a third concentration meter 13 are arranged on the L2 pipeline; the section L7 is equipped with a fourth flow meter 14 and a fourth concentration meter 15.
In order to ensure the smooth implementation of the method of the present invention, the sensing device also needs to satisfy the constraint conditions given by the present invention to achieve the optimal metering effect.
The main performance index of the flowmeter is the metering uncertainty corresponding to the flowmeter, so the metering uncertainty of the flowmeter needs to be restrained.
δqm<Z
Where δ qm — represents the uncertainty of the flow meter;
z-represents the maximum value of the flow meter uncertainty.
For the metering uncertainty required by the present invention, different uncertainty levels may be determined from different steel mills, but it is recommended that the uncertainty be within ± 1.0%.
(2) Constraint conditions of concentration meter
The main performance indexes of the concentration meter are the sensitivity, the precision and the response time of the concentration meter. Because the concentration meter belongs to an analysis instrument, the performance difference is large at present, the invention only appoints that the precision is required to reach +/-1 percent F.S., and the response time is required to be T90 < 5 s.
It should be noted that all flow meters and concentration meters involved in the present invention have RS485 communication, which, in addition to facilitating wireless communication, also saves wiring complexity associated with multiple sensor arrangements.
The method for recovering the converter gas comprises the following steps:
converter gas which does not reach the standard after dust removal generally appears at the initial stage and the final stage of converter blowing in terms of smelting process. At the beginning of the blowing and in the later stage of the blowing, the conditions of low CO concentration and high O2 concentration exist, and the CO concentration reaches the standard and is stable in the middle stage of the blowing.
In the middle stage of converting, converter gas generated by a converter 1 enters an L1 section of pipeline after passing through a dust removal device 2, the pressure and the concentration are detected by a first flowmeter 8 and a first concentration meter 9 which are installed on an L1 section of pipeline, the concentration reaches the standard, the converter gas sequentially enters a gas chamber 4 through an L2 section and an L3 section, and then is pressurized by a pressurizing station 5 and then is conveyed to a user end 7 through an L7 section of pipeline;
in the initial stage and the final stage of blowing, the concentrations of the converter gas detected by the first flowmeter 8 and the first concentration meter 9 on the L1 section of pipeline do not reach the standard, the converter gas enters the L6 section after passing through the L2 section, the converter gas with high concentration (generally 50%, the specific concentration is measured by the fourth concentration meter 15, and the make-up amount is measured by the fourth flowmeter 14) stored in the gas holder 4 is mixed with the converter gas which does not reach the standard in the L6 section in the L3 section after passing through the L7 section, then is mixed with the converter gas in the L1 section after passing through the L5 section by the L3 section, the concentration and the pressure are detected by the third flowmeter 12 and the third concentration 13 which are installed on the L2 section after mixing, and the concentration is conveyed to the user terminal 7 for use after reaching the standard through the L4 section and the.
For converter gas which does not reach the standard after dust removal, the smelting process generally occurs in the early stage and the later stage of converter blowing. At the beginning of the blowing and in the later stage of the blowing, the conditions of low CO concentration and high O2 concentration exist, and the CO concentration reaches the standard and is stable in the middle stage of the blowing.
The calculation formula of the concentration and the flow of the mixed converter gas in the L2 section is as follows:
in the formula, G1-volumetric flow of converter gas indicated in the flow meter 1;
G2-volumetric converter gas flow rate indicated in the first flowmeter 8;
The algorithm for achieving the recovery condition of CO and O2 given in the invention is as follows:
in the formula, X, the lowest index of the volume fraction of the built-in CO in the invention can be modified according to different requirements provided by different steel mills;
y-the volume fraction recovery index of O2 built in the invention can be modified according to different requirements provided by different steel mills.
And (3) effect measurement:
by taking a 300t converter of a certain famous iron and steel enterprise in China as an example, the economic benefit of the recovery device and the method adopted by the invention is calculated, through the converter gas total recovery technology of the patent, the converter gas can be recovered at the initial stage and the final stage of blowing in the 300t converter smelting process to be 12.9m3/t, and the average calorific value of the converter gas at the smelting stage is 2310kJ/m 3. The converter gas heat calculation formula is as follows:
Q＝H.g.T
in the formula, Q is total heat of converter gas which can be additionally recovered after the technology is adopted;
h, average heat value of converter gas under the condition of not reaching the standard;
g, the recovery amount of the converter gas per ton of steel gas in the substandard period;
t-nominal capacity of converter gas.
The average heat value 2310kJ/m3 of the converter gas, the recovery amount of the ton steel gas of 12.9m3/t in the period of not reaching the standard and the nominal capacity 300t of the converter are substituted into a formula for calculation, so that the heat of 8.94GJ can be brought to a 300t converter in the one-furnace smelting process, and the recoverable converter gas heat is about 217GJ according to the existing 300t converter gas heat, therefore, the recovered heat value of the converter gas can be improved by 3.69% after the converter gas full-recovery method disclosed by the patent is adopted.
According to the statistical result of domestic iron and steel enterprises, the price of the gas of each GJ converter is about 65 yuan, and the economic benefit brought to the smelting process of each converter through the technology is about 581 yuan. Under normal circumstances, the number of furnaces per converter per day is 25, and the economic benefit that can be produced by the patented method per converter per day is 14525 yuan. Since the converter of the steel enterprise can not be stopped, the economic benefit which can be generated by each converter by the method is 5229000 yuan (522.9 ten thousand yuan) according to 360 days each year. Taking a million-ton steel mill as an example, the tonnage of a converter is about 600 tons (equivalent to two 300t converters), and 1045.8 ten thousand yuan of economic benefit can be created for one million-ton steel mill by the technology of the patent.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The converter gas full recovery device is characterized by comprising a converter (1), a dust removal device (2), a four-way valve (3), a gas chamber (4), a pressurization station (5), a bleeding tower (6) and a user side (7), wherein the converter (1) is connected with the dust removal device (2) through a pipeline, the gas chamber (4) is connected with the pressurization station (5) through a pipeline, the pressurization station (5) is connected with the user side (7) through a pipeline, three interfaces of the four-way valve (3) are respectively connected with the dust removal device (2), the gas chamber (4) and the bleeding tower (6), in addition, the other interface of the four-way valve is connected with two pipelines, one of the pipelines is connected between the dust removal device (2) and the four-way valve (3), and the other of the pipelines is connected between the pressurization station (5) and the user side (7); and a plurality of flowmeters and concentration meters are arranged on the pipeline between the dust removal device (2) and the four-way valve (3), and each pipeline is provided with a control valve.
2. The converter gas full recovery device according to claim 1, characterized in that the pipelines are respectively named as L1-L8, wherein the L1 is provided with a first flowmeter (8) and a first concentration meter (9); wherein a first flowmeter (10) and a second concentration meter (11) are arranged on the L3 section of pipeline; a first flowmeter (12) and a third concentration meter (13) are arranged on the L2 section of pipeline; the L7 section is provided with a fourth flowmeter (14) and a fourth concentration meter (15).
3. The full recovery device of converter gas according to claim 1, wherein the flow meter and the concentration meter are both provided with RS485 communication.
4. A recovery method of the converter gas full recovery device based on claim 1, characterized in that in the middle stage of blowing, the converter gas generated by the converter (1) enters an L1 pipeline after passing through a dust removal device (2), the pressure and the concentration are detected by a first flowmeter (8) and a first concentration meter (9) which are installed on an L1 pipeline, the concentration reaches the standard, the converter gas sequentially enters a gas cabinet (4) after passing through an L2 pipeline and an L3 pipeline, then the converter gas is pressurized by a pressurizing station (5) and then is conveyed to a user end (7) through an L7 pipeline, the first flowmeter (8) and the first concentration meter (9) on the L1 pipeline detect that the concentration does not reach the standard, the converter gas enters an L6 section after passing through an L2 section, the converter gas with high concentration stored in the gas cabinet (4) passes through an L7 section and then is mixed with the converter gas which does not reach the standard in an L6 section in an L4 section 829, and then the mixture passes through an L5 section from an L3 section and then is mixed with converter gas in an L1 section, the mixture is subjected to concentration and pressure detection through a third flow meter (12) and a third concentration (13) which are arranged at an L2 section, and the mixture is conveyed to a user end (7) through an L4 section and an L8 section after the concentration reaches the standard.
5. The method for recovering converter gas according to claim 4, wherein the calculation formula of the concentration and flow rate of the converter gas mixed in the section L2 is as follows:
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011121480.9A CN112430700A (en) | 2020-10-20 | 2020-10-20 | Converter gas full recovery device and recovery method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011121480.9A CN112430700A (en) | 2020-10-20 | 2020-10-20 | Converter gas full recovery device and recovery method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114262764A (en) * | 2021-12-31 | 2022-04-01 | 北京清创晋华科技有限公司 | Converter gas full recovery device |
| CN114381569A (en) * | 2022-01-18 | 2022-04-22 | 南京罕华流体技术有限公司 | Converter system gas recovery optimization comprehensive evaluation method |
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| JP2001032010A (en) * | 1999-07-23 | 2001-02-06 | Kawasaki Steel Corp | Method for recovering exhaust gas generated in metallurgical furnace |
| CN201817509U (en) * | 2010-07-30 | 2011-05-04 | 中冶南方工程技术有限公司 | Converter coal gas dry-method dedusting system |
| CN107604123A (en) * | 2017-08-17 | 2018-01-19 | 王虎 | A kind of method for effectively improving RECOVERY OF CONVERTER GAS quality and quantity |
| CN108977616A (en) * | 2018-10-12 | 2018-12-11 | 中冶京诚工程技术有限公司 | Flue gas dry cleaning of converter and recovery system |
| CN208846409U (en) * | 2018-08-10 | 2019-05-10 | 沈阳格竹科技有限公司 | Reduce the energy conservation and environmental protection system of CO discharge amount |
-
2020
- 2020-10-20 CN CN202011121480.9A patent/CN112430700A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001032010A (en) * | 1999-07-23 | 2001-02-06 | Kawasaki Steel Corp | Method for recovering exhaust gas generated in metallurgical furnace |
| CN201817509U (en) * | 2010-07-30 | 2011-05-04 | 中冶南方工程技术有限公司 | Converter coal gas dry-method dedusting system |
| CN107604123A (en) * | 2017-08-17 | 2018-01-19 | 王虎 | A kind of method for effectively improving RECOVERY OF CONVERTER GAS quality and quantity |
| CN208846409U (en) * | 2018-08-10 | 2019-05-10 | 沈阳格竹科技有限公司 | Reduce the energy conservation and environmental protection system of CO discharge amount |
| CN108977616A (en) * | 2018-10-12 | 2018-12-11 | 中冶京诚工程技术有限公司 | Flue gas dry cleaning of converter and recovery system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114262764A (en) * | 2021-12-31 | 2022-04-01 | 北京清创晋华科技有限公司 | Converter gas full recovery device |
| CN114381569A (en) * | 2022-01-18 | 2022-04-22 | 南京罕华流体技术有限公司 | Converter system gas recovery optimization comprehensive evaluation method |
| CN114381569B (en) * | 2022-01-18 | 2023-01-17 | 南京罕华流体技术有限公司 | Converter system gas recovery optimization comprehensive evaluation method |
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Application publication date: 20210302 |