CN102876837A - Device and method for removing dust from converter gas by dry method - Google Patents
Device and method for removing dust from converter gas by dry method Download PDFInfo
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- CN102876837A CN102876837A CN2012103460915A CN201210346091A CN102876837A CN 102876837 A CN102876837 A CN 102876837A CN 2012103460915 A CN2012103460915 A CN 2012103460915A CN 201210346091 A CN201210346091 A CN 201210346091A CN 102876837 A CN102876837 A CN 102876837A
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- gas
- converter
- coal gas
- dedusting
- electrostatic precipitator
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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
- Y02P10/25—Process efficiency
Abstract
The invention discloses a device and a method for removing dust from converter gas by a dry method. The device comprises a converter, a vaporization cooling stack, an evaporative cooler, a crude dust collection system, an electrostatic dust collector system, a fine dust collection system, a fan, a gas component analysis system, a switching valve and a hydraulic station which are connected through a pipeline; the switching valve and the hydraulic station are in three-way connection with a gas chamber and a gas diffusion ignition system; and the vaporization cooling stack is communicated with a compressed air spraying system. A gas ionization area and a dust charging depression area of the electrostatic dust collector are separated, so that the damage of gas explosion to the electrostatic dust collector is avoided substantially, and the safety of a technology for removing dust from the converter gas by the method is improved. An appropriate amount of compressed air is sprayed into the vaporization cooling stack to ensure that gas is combusted, so that the recycling amount of saturated steam is improved. When the gas is recycled, the spraying of the compressed air is stopped, so that more converter gas can be recycled; and therefore, the convert gas can be fully utilized.
Description
Technical field
The present invention relates to a kind of dry dedusting of converter device and method.
Background technology
Converter generates coal gas of converter in steelmaking process, its main component is CO, CO
2, O
2, N
2With Ar etc., and the gas FeO, the Fe that carry
2O
3, CaO, SiO
2In dust, total dustiness is 80-150g/N m
3, it dedusting just can must be used, one ton of recyclable coal gas of converter 80-120Nm that contains CO concentration 60% of steel blows
3, be the important secondary energy of Steel Plant.The dry dedusting of converter technology is compared with other dedusting technologies all has obvious advantage in economy and environmental protection: the one, and efficiency of dust collection is high, and bug dust concentration is down to 15mg/Nm
3Below; The 2nd, dry-dedusting system does not exist mud and Sewage treatment systems, reclaims dust and can directly utilize, and has saved water consumption; The 3rd, system's resistance is decreased little, has reduced power consumption; The 4th, system simplification, floor space is little, is convenient to administer and maintain.
Existing converter gas dry-dedusting system mainly contains the compositions such as gasification cooling flue, evaporative cooler, electrostatic precipitator, blower fan, gas composition analytical system, switching station, gas cooler, diffusing chimney, emission coal gas ignition system, cinder transport system, thin grey transport system.
Gasification cooling flue mainly is to reduce gas temperature to produce saturated vapor, is the afterheat of converter gas retrieving arrangement; Evaporative cooler reduces gas temperature by water spray, and thick dedusting and the specific inductivity of regulating dust; Make gas produce a large amount of zwitterions by electrion between the anode and cathode in the electrostatic precipitator, ion is attached on the dust and in sedimentation on corresponding pole plate under the effect of electrical forces, reaches the purpose of smart dedusting; Blower fan is the propulsion source of whole system; The gas composition analytical system is measured coal gas and whether is reached recovering condition; Switching station is responsible for switching between reclaiming and diffusing, and plays the effect of T-valve; Gas cooler further cools off below the coal gas to 72 ℃, then sends into gas chamber; The coal gas that does not reach recovering condition diffuses by the diffusing chimney burning; In addition, system has cinder, thin grey transport system to collect dust, and the nitrogen induction apparatus is arranged at the diffusing chimney bottom, under the emergency case such as suddenly outage of blower fan, for system provides power, with inflammable and explosive coal gas diffusion burning.
The shortcoming of existing converter gas dry-dedusting system is: electric discharge phenomena occur in the electrostatic precipitator, when coal gas and air transition stage or converter abnormal operation, in electrostatic precipitator, blast, not only impact is produced, and large blast might surpass the tolerance range of electrostatic precipitator explosion venting valve and electrostatic precipitator is demolished.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of dry dedusting of converter device and method, takes full advantage of the energy of coal gas of converter in the non-coal-gas recovering phase; Avoid huge explosion to the harm of electrostatic precipitator, improve the dry-dedusting system security.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that a kind of dry dedusting of converter device, comprises being provided with converter, gasification cooling flue, evaporative cooler, cinder gathering system, electrostatic precipitator system, thin grey gathering system, blower fan, gas composition analysis system, switching valve and the Hydraulic Station that connects through piping; Switching valve and Hydraulic Station are connected with gas chamber, the threeway of emission coal gas ignition system, and described gasification cooling flue sprays into system being communicated with pressurized air.
Described electrostatic precipitation system comprises electrostatic precipitator, anion generator, gas switching valve and vibrated system, arranges broken-line type negative electrode and positive plate and the airflow-distribution board of series of parallel in the electrostatic precipitator.
Utilize the method for described dry dedusting of converter device dedusting,, comprise the steps:
A, converter are in steel-making cycle, and in blowing initial stage and latter stage, coal gas does not reach recovering condition, after the gasification cooling flue entrance sprays into pressurized air with gas-fired; When gas recovery, stop to spray into pressurized air;
After the coal gas of b, process step a reduces temperature by gasification cooling flue and evaporative cooler, enter electrostatic precipitation system by thick dedusting again and carry out smart dedusting, the anion generator of electrostatic precipitation system will pass into wherein ionization of gas by electrion, positively charged ion after the ionization imports the earth, negatively charged ion imports in the coal gas, arrange negative electrode and positive plate in the electrostatic precipitator of electrostatic precipitation system, add that at negative plate and positive plate strong voltage forms uniform electric field, charged dust constantly deposits on positive plate, by vibrated system dust is shaken;
Coal gas behind c, the process step b is measured coal gas through the gas composition analytical system and whether is reached recovering condition; Switching station is responsible for switching between reclaiming and diffusing, and the coal gas that reaches recovering condition further cools off, and then sends into gas chamber; The coal gas that does not reach recovering condition diffuses by the diffusing chimney burning.
The technique effect that the present invention reaches is as follows: dry dedusting of converter device of the present invention is by gasification cooling flue, and evaporative cooler is lowered the temperature, modified, thick dedusting, and the smart dedusting of electrostatic precipitator makes its dustiness reach 15mg/Nm
3Below, the converter gas dry method electrostatic precipitator technology is the coal gas dust removal of converter technology of energy-conserving and environment-protective.Its ionization of gas of traditional electrostatic precipitator, dust is charged and dust settling is all finished in same electric field, because the intermittence of converter smelting, electrostatic precipitator is periodically by coal gas of converter and air, and when its transitory stage coal gas of converter was in the limits of explosion scope, the electrical spark that ionization of gas produces just can set off an explosion.The present invention is separated gas ionization zone and the charged negative area of dust of electrostatic precipitator, from having avoided in essence the infringement of gas explosion to electrostatic precipitator, has improved the security of dry dedusting of converter technology.
In the steel-making cycle of converter, the blowing initial stage and latter stage coal gas of converter can not reach recovering condition, fully burn coal gas by spraying into an amount of pressurized air in the gasification cooling flue this moment, improves the yield of saturation steam.When gas recovery, stop to spray into pressurized air, thereby reclaim coal gas of converter more, thereby reach taking full advantage of of coal gas of converter.
Description of drawings
Fig. 1 is the structural representation of dry dedusting of converter device of the present invention;
Fig. 2 is gasification cooling flue pressurized air jetting device synoptic diagram;
Fig. 3 is the structural representation of electrostatic precipitation system;
Fig. 4 is a plurality of electric field series connection synoptic diagram;
Fig. 5 is the structural representation of venetian blind type inertial dust separator.
Embodiment
Such as Fig. 1-shown in Figure 2, be dry dedusting of converter device of the present invention, major parts has converter 1, pressurized air sprays into system 2, gasification cooling flue 3, steam pockets 4, gas-liquid two-phase spray gun 5, evaporative cooler 6, cinder gathering system 7, anion generator 8, electrostatic precipitator 9, thin grey gathering system 10, blower fan 11, gas composition analysis system 12, switching valve and Hydraulic Station 13, spray gun 14, gas cooler 15, gas chamber 16, diffusing chimney 17, nitrogen induction apparatus 18, emission coal gas ignition system 19, venetian blind type inertial dust separator 20, double-layer flap valve 21, airflow-distribution board 22, negative electrode and positive plate 23, purified gas pipeline 24, nitrogen pipeline 25; Pneumatic line 26 compositions such as grade.
A steel-making cycle of converter 1 is 30-45min, and wherein oxygen blow duration is 18-24min, but about 10-14min of the time of gas recovery, the blowing initial stage and latter stage coal gas of converter can not reach recovering condition (CO%〉30%, O
2＜1%), spray into system 2 by pressurized air and spray into an amount of pressurized air with gas-fired this moment, improves the yield of saturation steam.When gas recovery, stop to spray into pressurized air, thereby reclaim coal gas of converter more, thereby reach taking full advantage of of coal gas of converter.
As shown in Figure 3, electrostatic precipitation system mainly is divided into electrostatic precipitator 9, anion generator 8, gas switching valve and composition of the control system.
The broken-line type negative electrode of electrostatic precipitator 9 interior layout series of parallel and positive plate 23 and airflow-distribution board 22, add that at negative plate and positive plate 23 strong voltage forms uniform electric field, charged dust constantly deposits on positive plate, by vibrated system dust is shaken, the shaking cycle of the cleaning cathode-anode plate of assurance anode and negative plate 23 is different, respectively control.Electric discharge phenomena can not occur in the uniform electric field that forms between these electrostatic precipitator 9 inner anodes and the negative plate 23, so the installation requirement of pole plate is greatly reduced.
Anion generator 8 is with ionization of gas by electrion, control respectively by purified gas pipeline 24, nitrogen pipeline 25, pneumatic line 26 and to pass into purified gas, nitrogen and air, positively charged ion after the ionization imports the earth, and negatively charged ion imports in the coal gas, the quantity of negatively charged ion is huge on electrostatic precipitator 9 efficiency of dust collections impacts, so need anion generator 8 to have enough power or arrange a plurality of.
Steelmaking process is periodic process, thus electrostatic precipitator 9 periodically by air and coal gas of converter, anion generator 8, gas switching valve and electrostatic precipitator 9 have Controlling System automatically to control, and Controlling System and converter state are chain.Converter 1 is in non-smelting during the stage, and anion generator 8 is in low voltage and produces a small amount of negatively charged ion, and the shaking cycle of electrostatic precipitator 9 vibrated systems is long, and this moment, what pass into anion generator 8 was air; It is interim that converter is in smelting, anion generator is in high-voltage, and pass into nitrogen in the non-coal-gas recovering phase, and pass into clean coal gas of converter (this purified gas from blower fan 11 after or gas chamber 16) in the coal-gas recovering phase, this moment, the shaking cycle of electrostatic precipitator 9 vibrated systems was short.
Reentrainment of dust in anode and negative plate 23 rapping process, electrostatic precipitator 9 adopt a plurality of electric field series connection, to guarantee the dust removing effects of electrostatic precipitator.Make dust concentration reach 15mg/Nm
3Below, need 3-4 electrostatic precipitator series connection, and need arrange anion generator before each electrostatic precipitator, as shown in Figure 4.
Further illustrate content of the present invention below in conjunction with embodiment:
Example: suppose that the converter steelmaking cycle is 40min, wherein 0-10min is the front preparatory stage of blowing, and 11-32min is the blowing stage, and wherein 16-28min is the coal-gas recovering stage, 33-40min is the tapping stage, and then the workflow of dry dedusting of converter device is as follows:
1) 0-10min, gasification cooling flue do not pass into pressurized air, and anion generator 8 is in the operating on low voltage pattern, in pass into pressurized air, electrostatic precipitator 9 is in long shaking cycle;
2) 11-15min, gasification cooling flue pass into an amount of pressurized air, and anion generator 8 is in the high-pressure work pattern, pass into nitrogen in it, and electrostatic precipitator 9 is in short shaking cycle;
3) 16-28min, gasification cooling flue do not pass into pressurized air, and anion generator 8 is in the high-pressure work pattern, pass into purified gas in it, and electrostatic precipitator 9 is in short shaking cycle;
4) 29-32min, gasification cooling flue pass into an amount of pressurized air, and anion generator 8 is in the high-pressure work pattern, pass into nitrogen in it, and electrostatic precipitator 9 is in short shaking cycle;
5) 33-40min, gasification cooling flue do not pass into pressurized air, and anion generator 8 is in the operating on low voltage pattern, in pass into air, electrostatic precipitator 9 is in long shaking cycle;
Blower fan 11 is propulsion sources of whole system; Gas composition analytical system 12 is measured coal gas and whether is reached recovering condition; Switching valve and Hydraulic Station 13 are responsible for switching between reclaiming and diffusing, and play the effect of T-valve; Then the coal gas that reaches recovering condition send into gas chamber 16 through below the further cooling coal gas to 72 of gas cooler 15 and spray gun 14 ℃; The coal gas that does not reach recovering condition by diffusing chimney 17, diffuse the ignition system burning and diffuse; In addition, system has cinder, thin grey transport system to collect dust, and clear lower when the suddenly burst such as outage of blower fan 11, the diffusing chimney bottom has nitrogen induction apparatus 18 to provide power as system, and inflammable and explosive coal gas diffusion is burnt.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (3)
1. a dry dedusting of converter device comprises being provided with converter, gasification cooling flue, evaporative cooler, cinder gathering system, electrostatic precipitator system, thin grey gathering system, blower fan, gas composition analysis system, switching valve and the Hydraulic Station that connects through piping; Switching valve and Hydraulic Station are connected with gas chamber, the threeway of emission coal gas ignition system, it is characterized in that, described gasification cooling flue sprays into system being communicated with pressurized air.
2. dry dedusting of converter device as claimed in claim 1, it is characterized in that, described electrostatic precipitation system comprises electrostatic precipitator, anion generator, gas switching valve and vibrated system, arranges broken-line type negative electrode and positive plate and the airflow-distribution board of series of parallel in the electrostatic precipitator.
3. a method of utilizing dry dedusting of converter device as claimed in claim 1 dedusting is characterized in that, comprises the steps:
A, converter are in steel-making cycle, and in blowing initial stage and latter stage, coal gas does not reach recovering condition, after the gasification cooling flue entrance sprays into pressurized air with gas-fired; When gas recovery, stop to spray into pressurized air;
After the coal gas of b, process step a reduces temperature by gasification cooling flue and evaporative cooler, enter electrostatic precipitation system through thick dedusting again and carry out smart dedusting, the anion generator of electrostatic precipitation system will pass into wherein ionization of gas by electrion, positively charged ion after the ionization imports the earth, negatively charged ion imports in the coal gas, arrange negative electrode and positive plate in the electrostatic precipitator of electrostatic precipitation system, add that at negative plate and positive plate strong voltage forms uniform electric field, charged dust constantly deposits on positive plate, by vibrated system dust is shaken;
Coal gas behind c, the process step b is measured coal gas through the gas composition analytical system and whether is reached recovering condition; Switching station is responsible for switching between reclaiming and diffusing, and the coal gas that reaches recovering condition further cools off, and then sends into gas chamber; The coal gas that does not reach recovering condition diffuses by the diffusing chimney burning.
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| CN2012103460915A CN102876837A (en) | 2012-09-18 | 2012-09-18 | Device and method for removing dust from converter gas by dry method |
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|---|---|---|---|
| CN2012103460915A CN102876837A (en) | 2012-09-18 | 2012-09-18 | Device and method for removing dust from converter gas by dry method |
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| CN102876837A true CN102876837A (en) | 2013-01-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912074A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing dry process dust removal system from exhausting yellow smoke |
| CN107841589A (en) * | 2017-11-20 | 2018-03-27 | 北京京诚科林环保科技有限公司 | Flue rotating device |
| CN110237935A (en) * | 2019-06-20 | 2019-09-17 | 成渝钒钛科技有限公司 | A kind of converter dry cleaner that operational efficiency is high |
| CN112029951A (en) * | 2020-08-12 | 2020-12-04 | 北京首钢自动化信息技术有限公司 | Coarse ash conveying control method and device |
| CN112725558A (en) * | 2020-12-23 | 2021-04-30 | 苏州航明环保节能科技有限公司 | Converter gas dry-method dust removal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912074A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing dry process dust removal system from exhausting yellow smoke |
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| CN107841589A (en) * | 2017-11-20 | 2018-03-27 | 北京京诚科林环保科技有限公司 | Flue rotating device |
| CN107841589B (en) * | 2017-11-20 | 2023-12-08 | 北京京诚科林环保科技有限公司 | Rotary flue device |
| CN110237935A (en) * | 2019-06-20 | 2019-09-17 | 成渝钒钛科技有限公司 | A kind of converter dry cleaner that operational efficiency is high |
| CN112029951A (en) * | 2020-08-12 | 2020-12-04 | 北京首钢自动化信息技术有限公司 | Coarse ash conveying control method and device |
| CN112725558A (en) * | 2020-12-23 | 2021-04-30 | 苏州航明环保节能科技有限公司 | Converter gas dry-method dust removal device |
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Application publication date: 20130116 |