CN108507917B - Method for detecting dust removal capacity of converter primary flue gas dust removal system - Google Patents
Method for detecting dust removal capacity of converter primary flue gas dust removal system Download PDFInfo
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- CN108507917B CN108507917B CN201810357789.4A CN201810357789A CN108507917B CN 108507917 B CN108507917 B CN 108507917B CN 201810357789 A CN201810357789 A CN 201810357789A CN 108507917 B CN108507917 B CN 108507917B
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- flue gas
- converter
- dust removal
- gun
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N2015/0662—Comparing before/after passage through filter
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- 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 invention discloses a method for detecting the dust removal capacity of a converter primary flue gas dust removal system, which comprises the steps of opening a chimney test port, extending a monitoring gun into the chimney test port from the test port, and keeping the opening of a filter cylinder of the monitoring gun to deviate from flue gas flow; then, starting from the moment of blowing oxygen by the converter, rotating the monitoring gun by the time of N1 to enable the opening of a filter cylinder of the monitoring gun to face the flue gas flow, and starting dust sampling; at the time N2 after the monitor gun was rotated, the monitor gun was rotated again so that the opening of the filter cartridge was facing away from the flue gas stream; finally, the dust removal system is switched to a flue gas recovery state, and the monitoring gun is taken out after the time of N3; the detection method of the invention combines the actual rule of converter production, limits the sampling time of dust, enables the sampling interval to cover the peak interval of the dust content in the converter flue gas and the front and back of the peak interval, realizes the sampling of the converter primary flue gas to the maximum extent, and accurately obtains the primary flue gas dust content data.
Description
Technical Field
The invention relates to the field of converter dust removal, in particular to a method for detecting the dust removal capacity of a converter primary flue gas dust removal system.
Background
According to national regulations, the concentration standard of dust discharged into the ambient air by primary flue gas of a converter is 50 mg/standard cubic meter, wherein the primary flue gas refers to flue gas directly discharged into the air due to the fact that the CO concentration cannot reach the specified recovery standard in the steelmaking process, and the primary flue gas is flue gas which needs to be measured in the environment-friendly detection.
In actual operation, the CO concentration in flue gas varies widely for various reasons in converter operation; meanwhile, due to the severe toxicity of CO and the principle of safety, the determination of the detection time of the primary smoke in the prior art is rough; it is generally determined in three ways: (1) visually observing, and determining that the smoke discharged by the converter is qualified as primary smoke when the smoke is white; (2) detecting smoke generated in the whole stage from the beginning of oxygen blowing of the converter to the end of oxygen blowing of the converter as primary smoke; (3) roughly detecting smoke generated in the whole stage from the start of oxygen blowing of the converter to the moment of tapping as primary smoke.
The first method cannot quantify, and the second and third methods require first all of the flue gas in the entire process to be emitted before detection; because the detection includes the flue gas which is recycled by the gas holder in actual operation, and the flue gas is not in the detection range according to the national regulations, the flue gas and the dust content measured by the existing converter environmental protection detection are not the accurate dust content in the primary flue gas.
Disclosure of Invention
The invention aims to solve the technical problem of providing a detection method for accurately measuring the dust content in the primary flue gas of a converter.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for detecting the dust removal capacity of a converter primary flue gas dust removal system comprises the following steps:
step 1: opening a chimney test port, extending a monitoring gun into the chimney test port, and keeping the opening of a filter cylinder of the monitoring gun away from the flue gas flow;
step 2: rotating the monitoring gun from the moment of blowing oxygen by the converter, and rotating the monitoring gun after the time of N1 to enable the opening of a filter cylinder of the monitoring gun to face the flue gas flow and start dust sampling;
and step 3: at the time N2 after the monitor gun was rotated, the monitor gun was rotated again so that the opening of the filter cartridge was facing away from the flue gas stream;
and 4, step 4: switching the dust removal system to a flue gas recovery state;
and 5: at the time of N3 after step 4, the monitoring gun is taken out;
the N1 is 50-70 seconds, the N2 is 3-4 minutes, and the N3 is not less than 30 seconds.
The N1 is the waiting time, and in the initial oxygen blowing period, the air around the converter is mainly in the flue of the converter, the dust content is very low, and the data belong to invalid data influencing the detection result, so the sampling is started after the waiting time N1; the selection of N1 is related to the flue length and the flue gas flow speed, and the value of N1 is larger than the flue length divided by the flue gas flow speed.
The converter needs to add certain auxiliary materials into the molten steel in the initial 5-8 minutes of oxygen blowing, and the auxiliary material adding stage in the initial oxygen blowing stage is the stage with the largest content of flue gas and dust in the converter; in general, the CO concentration in the flue gas reaches the recyclable standard after oxygen blowing is carried out for 2-5 minutes by the converter, and then the converter dust removal system enters a flue gas recycling stage; this means that the primary flue gas to be detected is actually only present within five minutes after the oxygen blowing of the converter (while also eliminating data disturbances during the initial waiting time).
If only one smoke needing to be detected in the real sense is detected, the dust sampling time does not exceed one minute, and the detection data error of the short time is larger. In order to eliminate the error, the sampling time is prolonged to 3-4 minutes during flue gas detection, and the state switching time of the converter dust removal system is modified to be after dust sampling. Although the sampling time may enter the gas recovery period, the working condition at this time is basically the same as the working condition before the gas recovery, and the working condition is enough to accurately represent the dust content in the primary flue gas to be detected in a real sense.
Furthermore, in the step 1, after the monitoring gun is inserted into the test port, the test port is blocked by using a blocking object, so that the smoke overflow is reduced, and the safety is guaranteed.
Has the advantages that: (1) the detection method of the invention combines the actual rule of converter production, limits the sampling time of dust, enables the sampling interval to cover the peak interval of the dust content in the converter flue gas and the front and back of the peak interval, realizes the sampling of the converter primary flue gas to the maximum extent, and accurately obtains the primary flue gas dust content data. (2) The detection method of the invention sets the taking-out time of the monitoring gun in the flue gas recovery state, greatly reduces the concentration of harmful gas at the test port and ensures the safety of testing personnel.
Drawings
FIG. 1 is a flow chart of the detection method of example 1.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1
The method for detecting the dust removal capacity of the converter primary flue gas dust removal system in the embodiment needs to use the following tools in implementation: the device comprises a communication tool, a monitoring gun, a cloth strip and a smoke detection alarm; at least one operator and one tester are required; the cloth strip is used as a plugging object for plugging the test port, the communication tool is used for communication between an operator and a tester, and the smoke detection alarm instrument is worn by the tester.
The length of the flue of the converter (the length from the test port to the converter) in the embodiment is 500 m, and the flow speed of flue gas is 15-25 m/s.
As shown in fig. 1, the detection method of the present embodiment includes the following steps:
step 1: after the previous round of tapping is finished, the operator informs the tester; a tester opens a test port of the dust removal device on site, extends a monitoring gun into the test port, keeps an opening of a filter cylinder of the monitoring gun away from flue gas flow, and then plugs the test port by using a cloth strip;
step 2: an operator normally makes steel, and a tester is informed after the oxygen blowing lance is opened for one minute; a tester rotates the monitoring gun on site, so that the opening of a filter cylinder of the monitoring gun faces the flue gas flow, and dust sampling is started;
and step 3: after four minutes, the tester again rotates the monitor gun so that the opening of the filter cartridge is facing away from the flue gas stream; then the operator is notified;
and 4, step 4: an operator switches the dust removal device to a smoke recovery state and informs a tester;
and 5: after 30 seconds, the tester opens the cloth strip plug, quickly takes away the monitoring gun, and the sampling is finished.
Although the embodiments of the present invention have been described in the specification, these embodiments are merely provided as a hint, and should not limit the scope of the present invention. Various omissions, substitutions, and changes may be made without departing from the spirit of the invention and are intended to be within the scope of the invention.
Claims (2)
1. The method for detecting the dust removal capacity of the converter primary flue gas dust removal system is characterized by comprising the following steps of:
step 1: opening a chimney test port, extending a monitoring gun into the chimney test port from the test port, keeping an opening of a filter cylinder of the monitoring gun to deviate from flue gas flow, and plugging the test port by using a plugging object after the monitoring gun extends into the test port;
step 2: rotating the monitoring gun after the time of N1 from the moment of blowing oxygen by the converter, so that the opening of a filter cylinder of the monitoring gun faces to the flue gas flow;
and step 3: at the time N2 after the monitor gun was rotated, the monitor gun was rotated again so that the opening of the filter cartridge was facing away from the flue gas stream;
and 4, step 4: switching the dust removal system to a flue gas recovery state;
and 5: at the time of N3 after step 4, the monitoring gun is taken out;
n1 is 50-70 seconds, sampling is started after the time of waiting for N1, and the value of N1 is larger than the length of a flue divided by the flow speed of flue gas, so that the influence of air around the converter in the flue of the converter at the initial stage of oxygen blowing on the detection result is eliminated; and the sampling time N2 is 3-4 minutes, the sampling is continued after the concentration of CO in the flue gas reaches the recoverable standard, and the converter dust removal system is switched to the flue gas recovery state until the sampling time N2 is finished.
2. The method for detecting the dust removal capacity of the converter primary flue gas dust removal system according to claim 1, which is characterized in that: the N3 is not less than 30 seconds.
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| CN201810357789.4A CN108507917B (en) | 2018-04-20 | 2018-04-20 | Method for detecting dust removal capacity of converter primary flue gas dust removal system |
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| CN201810357789.4A CN108507917B (en) | 2018-04-20 | 2018-04-20 | Method for detecting dust removal capacity of converter primary flue gas dust removal system |
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| CN108507917A CN108507917A (en) | 2018-09-07 |
| CN108507917B true CN108507917B (en) | 2021-12-03 |
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| AUPO899297A0 (en) * | 1997-09-04 | 1997-09-25 | Dalley, Paul | Fluid mixing apparatus |
| AUPR186200A0 (en) * | 2000-12-04 | 2001-01-04 | Tesla Group Holdings Pty Limited | Plasma reduction processing of materials |
| CN2674428Y (en) * | 2004-02-18 | 2005-01-26 | 华东电力试验研究院 | Automatic constant speed flyash sampler for boiler flue |
| CN102139881B (en) * | 2010-01-28 | 2012-10-17 | 宫毅 | Method for producing hydrated silicon dioxide and aluminum-iron water treatment agent by using coal ash |
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| CN102851084B (en) * | 2011-06-30 | 2015-11-04 | 斯普瑞喷雾系统(上海)有限公司 | Converter flue gas coal gas semi-dry cooling and dedusting system |
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| CN102344987B (en) * | 2011-10-31 | 2013-09-18 | 中冶南方工程技术有限公司 | Primary flue gas dry dedusting process for vanadium recovering converter |
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| KR101798844B1 (en) * | 2016-09-02 | 2017-11-17 | 주식회사 포스코 | Lance and the converter operation method using the same |
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Effective date of registration: 20190212 Address after: 211800 Room 203, 2nd floor, Beidou Building, No. 6 Huida Road, Pukou District, Nanjing City, Jiangsu Province Applicant after: Nanjing Hengrui Environmental Protection Technology Co. Ltd. Address before: 210032 2nd Floor, No. 9 Junling Road, Gulou District, Nanjing City, Jiangsu Province Applicant before: Gong Yi |
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