CN102010928A - Converter oxygen lance blowing control method based on dry dedusting process - Google Patents
Converter oxygen lance blowing control method based on dry dedusting process Download PDFInfo
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- CN102010928A CN102010928A CN 201010590643 CN201010590643A CN102010928A CN 102010928 A CN102010928 A CN 102010928A CN 201010590643 CN201010590643 CN 201010590643 CN 201010590643 A CN201010590643 A CN 201010590643A CN 102010928 A CN102010928 A CN 102010928A
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Abstract
The invention relates to a converter oxygen lance blowing control method based on the dry dedusting process. The method comprises the following steps: when a converter oxygen lance begins to blow or begins to blow, then stops normally and continues to blow, the opening of an oxygen regulating valve is controlled to 50-70% for a certain time and a feeding valve actuator performs automatic regulation; when the converter oxygen lance re-blows in the back stage of the blowing, the oxygen regulating valve is preset to have an automatic initial valve opening and then the feeding valve actuator performs automatic regulation; and when the converter oxygen lance is interrupted by a fault and blows again, the opening of the oxygen regulating valve is fast controlled to 75%-85% for a certain time and the feeding valve actuator performs automatic regulation. By adopting the invention, the contents of O2 and CO in the fume gas can be effectively inhibited or controlled, the changes of the contents are limited within a safe operation range of the deduster and the safe operation problem of the main devices for dry dedusting is solved.
Description
Technical field
The present invention relates to the converter oxygen gun blowing control method of dry dedusting technology in the converter steelmaking.
Background technology
Dry method dust is a kind of novel dust removing technology of converter steelmaking in recent years.Dry dedusting technology utilizes nitrogen or steam will make steel the flue gas atomizing that produces at flue Venturi meter place by special ring nozzle and produces the cinder precipitation and collect and transhipment.Be drawn into high-voltage electrostatic dust separator then through the flue gas of removing cinder, carry out the smart filter of dust.Pass through switching station again, qualified flue gas (coal gas) is admitted to gas holder and reclaims.Underproof flue gas is derived burning through diffusing chimney.
Different with traditional wet dedusting, the major equipment high-voltage electrostatic dust separator of dry method dust is to O in the converter gas
2With CO reflection sensitivity, especially O
2When concentration surpasses certain value flue gas by with the friction generation vigorous reaction of electrostatic high-pressure electrode, make that flue gas expands rapidly in the fly-ash separator, cause safe explosion venting valve action, make that steelmaking process is unexpected to be stopped.Also will damage fly-ash separator equipment when situation is serious.Therefore, the matter of utmost importance of being furnished with the dry method dust converter steelmaking process is exactly the safe operation problem of electric precipitator, promptly must seek a kind of novel converter steelmaking O
2Converting method can effectively suppress or regulate and control O in the flue gas
2With CO content, make its variation be limited in guaranteeing in the scope of fly-ash separator safe operation.
In the converter control system of domestic independent development, dry method dust is bessemerized control techniques and is not appeared in the newspapers as yet.
Summary of the invention
Technical problem to be solved by this invention provides a kind of converter oxygen gun blowing control method based on dry dedusting technology, can effectively suppress or regulate and control O in the flue gas
2With CO content, make its variation be limited in guaranteeing in the scope of fly-ash separator safe operation.
Technical conceive of the present invention is at the converter steelmaking of being furnished with dry dedusting technology, under the prerequisite that does not increase hardware device, pass through software engineering, realization is to bessemerizing effective control of technology, make program according to steel-making begin blow, continue blowing after the normal interruption, the later stage re-blows and accident in have no progeny under several operating modes of blowing again to O
2Variable valve is controlled respectively, implements difference and opens the valve curve, obtains controlled oxygen flow intensity, has both satisfied the basic demand of converter steelmaking process, guarantees the safe operation of nonaqueous dust cleaner again.
For solving the problems of the technologies described above, the invention provides a kind of converter oxygen gun blowing control method based on dry dedusting technology, comprise, existing valve regulated device is according to the Oxygen Flow value of measuring in real time and the oxygen flow target value of setting, regulate algorithm according to PI, calculate the ideal valve place value of current oxygen regulating valve, and this ideal valve place value is delivered to oxygen regulating valve, to regulate the aperture of oxygen regulating valve; It is characterized in that, may further comprise the steps:
Judge current converter oxygen gun blowing state of living in, described converter oxygen gun blowing state comprises: continue the blowing again of having no progeny in the re-blowing of blowing, blowing later stage, the fault after the back normal interruption that begins to blow, begins to blow;
When described converter oxygen gun blowing state for begin blowing or the back normal interruption that begins to blow after when continuing the blowing state, the oxygen regulating valve door is opened aperture to 50%-70%, after the time-delay certain hour section, drop into the valve regulated device and regulate automatically;
When described converter oxygen gun blowing state is the state of re-blowing in blowing later stage, the oxygen regulating valve door is predisposed to automatically initial valve opening, drop into the valve regulated device then to regulate automatically;
When described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door is opened aperture to 75%-85% fast, after the time-delay certain hour section, drop into the valve regulated device and regulate automatically.
Further improved, when described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door is opened aperture to 75%-85% fast, after the time-delay certain hour section, the oxygen regulating valve door is closed aperture to 20%-50% gradually, after the certain hour section of delaying time again, drop into the valve regulated device and regulate automatically.
Preferably, when described converter oxygen gun blowing state for begin blowing or the back normal interruption that begins to blow after when continuing the blowing state, the oxygen regulating valve door was opened aperture to 65% in 30 seconds, 25-40 is after time period second in time-delay, drops into the valve regulated device and regulates automatically;
When described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door was opened aperture to 85% in 10 seconds, 25-40 is after time period second in time-delay, the oxygen regulating valve door was closed aperture to 35% in 20 seconds, 10-20 delay time again after time period second, drop into the valve regulated device and regulate automatically.
This programme has solved the safe operation problem of dry method dust major equipment by the control strategy of the oxygen regulating valve under the different operating modes, is worth applying in being furnished with the converter steelmaking process of dry dust removal equipment.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 is a control flow chart of the present invention.
Embodiment
The classical control process of bessemerizing is to preset at oxygen regulating valve directly to drop into valve regulated device PI on the valve position basis and regulate automatically.The result that this control brings is that the blowing initial stage enters the O in the stove
2Have little time by molten iron oxidation (Fe
3O
4=2O
2+ 3Fe) cause O in the flue gas
2Content is bigger.This there is no big influence to traditional wet dedusting.But, for dry dedusting technology with electric precipitator, high O
2The flue gas of concentration has the risk that causes the venting of dust explosion accident by electric precipitator, and steel-making can't normally be carried out.After through the blowing initial stage, the blowing oxygen quantity in the steel melting furnace reaches set(ting)value, and the redox reaction in the stove tends towards stability O in the flue gas
2Content reduces and keeps certain certain value, to not influence of electric precipitator.
According to existing theoretical, for realizing the oxygen flow Linear Control of oxygen regulating valve under the control of valve regulated device, the oxygen valve setter must operate at the straight-line segment of valve working flow curve, promptly avoids the minimum and the range zone of valve valve position.Generalized case, valve position stroke＜15% or 85% zone is considered to the inelastic region or the unadjustable district of valve.In fact, in order to reduce O
2The pressure-losses of pipeline and pipeline series devices, the common polarization design of the bore of oxygen cutting valve, variable valve and pipeline etc. and size makes variable valve open to about 60% and has just reached the required maximum O of blowing
2Flow promptly has no chance to make valve to arrive the inelastic region of its big aperture.What therefore the unique needs of variable valve setter were avoided is the inelastic region of the little aperture of valve.The concrete numerical value of little aperture is different because of valve characteristic, can be determined by test.The minimum aperture of valve is decided to be 8% in this specific embodiment, and result of use is good.
In the linear regulation district of valve, the oxygen flow by valve becomes approximate linear (valve working flow curve) with valve opening.Therefore change the rate of change (Nm that valve opening speed (%/s) just can change oxygen flow
3/ h/ △ t), thus make oxygen flow controlled.After the blowing task termination of a stage, comprise that also accident interrupts, oxygen regulating valve closes to minimum opening value rapidly, for example 8%, for blowing next time ready.The control of oxygen cutting valve is identical with wet dedusting technology with interlocking, repeats no more.
By splitting the control of valve speed, time-delay waiting time and initial valve position, make the technology of bessemerizing of being furnished with dry method dust become possibility.
According to converter steelmaking process, by the percentage ratio definition steel-making process of blowing the oxygen consumption total amount.Usually, open from new stove and to blow afloat a calculating, the oxygen blast total amount was defined as main blowing the stage less than 95% o'clock, surpassed 95% and was the steel-making later stage.The oxygen rifle descends and to open the process of blowing during steel-making, comprises following several state: 1. begin blowing, 2. begin to blow continue blowing after the normal interruption of back, 3. the later stage re-blows, 4. has no progeny in the accident and recover blowing.
Beginning blowing is to open under the state of blowing furnace atmosphere instability, O in the flue gas for the first time
2Too high levels.Begin to blow and continue under the blowing state after the normal interruption of back, blow usually from opening for the first time the time of blowing very closely, can be considered to open for the first time and blow because open once more after the normal interruption blowing.With in " wet dedusting " directly to drive valve different, in " dry method dust ", promptly open under the state of blowing for the first time beginning blowing, oxygen regulating valve open that the valve operation should be left slowly or slow opening, by controlled valve position, can obtain controlled oxygen flow, finally make O in the flue gas
2Content is inhibited.
In the steel-making later stage, total oxygen consumption surpasses 95%, and oxidizing atmosphere is abundant in the stove, and movable gas hood rises, and remaining CO is at fire door and O in the flue gas
2Effect is oxidized to CO
2The flue gas that enter electric precipitator this moment there is no substantial harm.The time length that steel-making is re-blow in the later stage is several minutes or tens of seconds only.Therefore, steel-making " later stage re-blows " adopts classical following rifle to open the valve control mode, is same as the wet dedusting process for making.
It is a kind of accident that accident is interrupted, due to the accident that causes by equipment failure or misoperation, comprise that fault is that the accident that the safety interlocking between oxygen rifle self electric or mechanical fault or oxygen rifle and body of heater causes is put forward rifle accident (oxygen transmission mechanism dead electricity etc.), perhaps, the accident that causes of technology interlocking is put forward rifle accident (as the flue collector cooling water flow low etc.).Cause of accident is varied, and is intricate, but the physical phenomenon when having an accident is rather approximate, and promptly the accident pilosity is born in main stage steel-making middle and later periods of blowing in the stage, and the CO content in this moment flue gas is higher.CO too high levels by electric precipitator also will constitute a threat to electric precipitator equipment.Therefore, the valve control that accident interrupts continuing blowing in the back then requires quick-opening valve door, valve to open the bigger oxygen flow of acquisition fast, the CO in the stove can be oxidized to CO
2, cut down the CO content in the flue gas.
As shown in Figure 1, system send down rifle open blow signal after, judge current converter oxygen gun blowing state of living in, when described converter oxygen gun blowing state for begin blowing or the back normal interruption that begins to blow after when continuing the blowing state, the oxygen regulating valve door was opened aperture to 50%-65% in 30 seconds, 25-40 is after time period second in time-delay, drops into the valve regulated device and regulates automatically;
When described converter oxygen gun blowing state is the state of re-blowing in blowing later stage, the oxygen regulating valve door is predisposed to automatically initial valve opening, drop into the valve regulated device then to regulate automatically;
When described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door was opened aperture to 75%-85% in 10 seconds, 25-40 is after time period second in time-delay, the oxygen regulating valve door was closed aperture to 20%-50% in 20 seconds, 10-20 delay time again after time period second, drop into the valve regulated device and regulate automatically.In first section valve position, can find such valve position value, make that it is corresponding with bigger oxygen flow (the oxygen amount that for example normally blows set(ting)value 85% ~ 90%).Can rapidly the CO in the stove be oxidized to CO2 after big flow oxygen enters converter, weaken CO concentration.In order to make flue gas reposefully by electric precipitator, it is necessary that certain time-delay is waited for.Through after the big flow oxygen-supply operation of fs, should make valve get back to normal valve position, cut and finish ensuing blowing task so that make the valve regulated device can not have disturbance ground.
Said process can adopt the program of working out on valve regulated device PLC, realize the control of bessemerizing of being furnished with dry dedusting technology.
This programme has solved the safe operation problem of dry method dust major equipment preferably by the control strategy of oxygen valve under three kinds of operating modes, and the converter steelmaking process of being furnished with dry dust removal equipment is had certain specific aim.This programme with and sequence of control in certain Iron And Steel Company new 1# converter first Application and succeed, created once success of blow-on, normally smelt 18 minutes domestic record.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. one kind based on the converter oxygen gun of dry dedusting technology blowing control method, comprise, existing valve regulated device is according to the Oxygen Flow value of measuring in real time and the oxygen flow target value of setting, regulate algorithm according to PI, calculate the ideal valve place value of current oxygen regulating valve, and this ideal valve place value delivered to oxygen regulating valve, to regulate the aperture of oxygen regulating valve; It is characterized in that, may further comprise the steps:
Judge current converter oxygen gun blowing state of living in, described converter oxygen gun blowing state comprises: continue the blowing again of having no progeny in the re-blowing of blowing, blowing later stage, the fault after the back normal interruption that begins to blow, begins to blow;
When described converter oxygen gun blowing state for begin blowing or the back normal interruption that begins to blow after when continuing the blowing state, the oxygen regulating valve door is opened aperture to 50%-70%, after the time-delay certain hour section, drop into the valve regulated device and regulate automatically;
When described converter oxygen gun blowing state is the state of re-blowing in blowing later stage, the oxygen regulating valve door is predisposed to automatically initial valve opening, drop into the valve regulated device then to regulate automatically;
When described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door is opened aperture to 75%-85% fast, after the time-delay certain hour section, drop into the valve regulated device and regulate automatically.
2. the converter oxygen gun blowing control method based on dry dedusting technology according to claim 1, it is characterized in that, when described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door is opened aperture to 75%-85% fast, after the time-delay certain hour section, the oxygen regulating valve door is closed aperture to 20%-50% gradually, after the certain hour section of delaying time again, drop into the valve regulated device and regulate automatically.
3. the converter oxygen gun blowing control method based on dry dedusting technology according to claim 2 is characterized in that,
When described converter oxygen gun blowing state for begin blowing or the back normal interruption that begins to blow after when continuing the blowing state, the oxygen regulating valve door was opened aperture to 65% in 30 seconds, 25-40 is after time period second in time-delay, drops into the valve regulated device and regulates automatically;
When described converter oxygen gun blowing state is to have no progeny in the fault when blowing state again, the oxygen regulating valve door was opened aperture to 85% in 10 seconds, 25-40 is after time period second in time-delay, the oxygen regulating valve door was closed aperture to 35% in 20 seconds, 10-20 delay time again after time period second, drop into the valve regulated device and regulate automatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010590643A CN102010928B (en) | 2010-12-15 | 2010-12-15 | Converter oxygen lance blowing control method based on dry dedusting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010590643A CN102010928B (en) | 2010-12-15 | 2010-12-15 | Converter oxygen lance blowing control method based on dry dedusting process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102010928A true CN102010928A (en) | 2011-04-13 |
| CN102010928B CN102010928B (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010590643A Expired - Fee Related CN102010928B (en) | 2010-12-15 | 2010-12-15 | Converter oxygen lance blowing control method based on dry dedusting process |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392096A (en) * | 2011-12-05 | 2012-03-28 | 济南钢铁股份有限公司 | Self-adapting oxygen flow rate controlling system used in automatic steelmaking converter |
| CN102912073A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN102925620A (en) * | 2012-08-07 | 2013-02-13 | 中冶建筑研究总院有限公司 | Automatic controlling method of converter gas purification and recovery system adjustable Venturi tube |
| CN102925621A (en) * | 2012-11-13 | 2013-02-13 | 攀钢集团研究院有限公司 | Method for preventing dry dedusting system of semi-steel steel converter from explosion venting |
| CN103060511A (en) * | 2013-01-14 | 2013-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen supply method for preventing dedusting explosion venting of semisteel steel converter and semisteel smelting method |
| CN104862444A (en) * | 2015-05-06 | 2015-08-26 | 唐山钢铁集团有限责任公司 | Method for preventing explosion venting of dry dedusting system of catch carbon converter |
| CN105274277A (en) * | 2015-11-25 | 2016-01-27 | 中冶南方工程技术有限公司 | Oxygen blowing control method for dry dedusting explosion suppression of converter |
| CN107012288A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of converter movable hood control method |
| CN108504816A (en) * | 2018-03-21 | 2018-09-07 | 中冶东方工程技术有限公司 | Oxygen blown control method in converter top-blow converting process |
| CN110273044A (en) * | 2019-06-20 | 2019-09-24 | 河钢股份有限公司承德分公司 | The method for controlling converter dry dedusting discharge |
| CN110736581A (en) * | 2019-09-17 | 2020-01-31 | 北京科技大学 | method and system for measuring pressure loss of converter oxygen lance pipeline |
| CN111575431A (en) * | 2020-05-22 | 2020-08-25 | 山东钢铁股份有限公司 | Method for increasing CO content of converter gas |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392096A (en) * | 2011-12-05 | 2012-03-28 | 济南钢铁股份有限公司 | Self-adapting oxygen flow rate controlling system used in automatic steelmaking converter |
| CN102925620A (en) * | 2012-08-07 | 2013-02-13 | 中冶建筑研究总院有限公司 | Automatic controlling method of converter gas purification and recovery system adjustable Venturi tube |
| CN102912073A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN102912073B (en) * | 2012-11-08 | 2014-08-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN102925621A (en) * | 2012-11-13 | 2013-02-13 | 攀钢集团研究院有限公司 | Method for preventing dry dedusting system of semi-steel steel converter from explosion venting |
| CN103060511A (en) * | 2013-01-14 | 2013-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen supply method for preventing dedusting explosion venting of semisteel steel converter and semisteel smelting method |
| CN103060511B (en) * | 2013-01-14 | 2014-07-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen supply method for preventing dedusting explosion venting of semisteel steel converter and semisteel smelting method |
| CN104862444B (en) * | 2015-05-06 | 2017-02-01 | 唐山钢铁集团有限责任公司 | Method for preventing explosion venting of dry dedusting system of catch carbon converter |
| CN104862444A (en) * | 2015-05-06 | 2015-08-26 | 唐山钢铁集团有限责任公司 | Method for preventing explosion venting of dry dedusting system of catch carbon converter |
| CN105274277A (en) * | 2015-11-25 | 2016-01-27 | 中冶南方工程技术有限公司 | Oxygen blowing control method for dry dedusting explosion suppression of converter |
| CN105274277B (en) * | 2015-11-25 | 2017-07-11 | 中冶南方工程技术有限公司 | A kind of datonation-inhibition oxygen blast control method of converter dry dedusting |
| CN107012288A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of converter movable hood control method |
| CN107012288B (en) * | 2016-01-27 | 2018-11-06 | 鞍钢股份有限公司 | A kind of converter movable hood control method |
| CN108504816A (en) * | 2018-03-21 | 2018-09-07 | 中冶东方工程技术有限公司 | Oxygen blown control method in converter top-blow converting process |
| CN110273044A (en) * | 2019-06-20 | 2019-09-24 | 河钢股份有限公司承德分公司 | The method for controlling converter dry dedusting discharge |
| CN110736581A (en) * | 2019-09-17 | 2020-01-31 | 北京科技大学 | method and system for measuring pressure loss of converter oxygen lance pipeline |
| CN111575431A (en) * | 2020-05-22 | 2020-08-25 | 山东钢铁股份有限公司 | Method for increasing CO content of converter gas |
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Application publication date: 20110413 Assignee: Wuhan Iron & Steel Engineering Technology Group Co., Ltd. Assignor: Wuhan Iron & Steel (Group) Corp. Contract record no.: 2014420000075 Denomination of invention: Converter oxygen lance blowing control method based on dry dedusting process Granted publication date: 20120926 License type: Exclusive License Record date: 20140522 |
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