CN105018714B - Method for humidifying atmosphere in continuous annealing furnace - Google Patents
Method for humidifying atmosphere in continuous annealing furnace Download PDFInfo
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- CN105018714B CN105018714B CN201410155850.9A CN201410155850A CN105018714B CN 105018714 B CN105018714 B CN 105018714B CN 201410155850 A CN201410155850 A CN 201410155850A CN 105018714 B CN105018714 B CN 105018714B
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Abstract
The invention discloses a method for humidifying atmosphere in a continuous annealing furnace. The method comprises the steps of extracting burning waste gas of a direct-frame heating section of the continuous annealing furnace to a heating section and a soaking section of a radiant tube of the continuous annealing furnace so as to regulate the atmosphere dew points of the heating section and the soaking section of the radiant tube. The method for humidifying atmosphere in the continuous annealing furnace is capable of improving the humidity in the continuous annealing furnace to regulate the atmosphere dew point in the continuous annealing furnace and effectively avoid the oxidization of hearth liner and strip steel surface.
Description
Technical field
The present invention relates to a kind of Heat Treatment Control method of strip, more particularly, to a kind of control method of continuous annealing furnace.
Background technology
In continuous annealing furnace, cold rolling after strip through heating and cooling etc. is after Technology for Heating Processing, can be only achieved user
Required mechanical performance.In continuous annealing furnace, the contact with furnace atmosphere for the strip can make belt steel surface state change,
Accordingly, it would be desirable to being adjusted according to the different demands of product surface quality and controlling the protective atmosphere in annealing furnace.Existing continuous
Annealing furnace（Vertical or horizontal）As shown in figure 1, being respectively arranged with along the two ends of the direct of travel Q of strip in continuous annealing furnace 1
One loop trolley 2,3, has three regions in continuous annealing furnace, it is respectively the thermal treatment zone 4, soaking along the direct of travel of strip
Area 5 and cooling zone 6, are externally provided with humidifier 7 in continuous annealing furnace mixed to be passed through to the thermal treatment zone 4 of continuous annealing furnace and soaking zone 5
Close gas (including vapor, nitrogen+hydrogen).Continuous annealing furnace as shown in Figure 1 can be by adjusting the hydrogen in burner hearth air inlet
Gas concentration is adjusting the hydrogen content in stove it is also possible to adjust gas in stove by adjusting protective gas air inflow and flow direction
The oxygen concentration of atmosphere, but such continuous annealing furnace lacks effective control measures to the dew point in stove, and very difficult satisfaction is increasingly
The demand for control of strict strip surface quality.Therefore, the enterprise of steel field wishes to obtain a kind of new continuous annealing furnace,
Continuous annealing furnace is enable to have the adjusting control function of furnace atmosphere dew point.
The structure of existing continuous annealing annealing furnace humidifying device suffers from the drawback that：
1）The humidified gas of the high dew point of low temperature have stronger oxidisability, especially can cause air admission hole hearth inner lining nearby
Oxidation.
2）In low temperature season, low temperature humidified gas easily condensed thus generating water before entering burner hearth in the duct, water
Enter the degree of oxidation that burner hearth has been further exacerbated by hearth inner lining plate, or even water inlet in stove can be caused, cause the serious oxygen of strip
Change.
3）Humidified gas enter in burner hearth and spread, easily cause that humidification is uneven in burner hearth, cause local humidity increase excessive
Or the phenomenon that humidification is not enough.
4）The structure of humidifying device and dew point regulation control are all more complicated, and regular maintenance difficulty is big, and the equipment initial stage puts into
High cost.
Strip passes through the Technology for Heating Processing section such as heating and cooling in continuous annealing furnace, all can be with whole annealing process
Protective atmosphere in stove is fully contacted, and belt steel surface occurs related chemical reaction with furnace atmosphere, thus band can be changed
The configuration of surface of steel and surface characteristics.The dew point of adjustment furnace atmosphere is actually the oxidation/reduction adjusting furnace atmosphere,
Dew point more high then furnace atmosphere oxidisability is stronger, and vice versa.Different steel grades are possible to furnace atmosphere is revealed in annealing process
The requirement of point is different, it is then desired to fully be adjusted for furnace atmosphere dew point using effective adjustment means.
Notification number is CN202595220U, and the day for announcing is on December 12nd, 2012, a kind of entitled " continuous annealing furnace atmosphere
The Chinese patent literature of dew point control device " relate to a kind of continuous annealing furnace dew point of atmosphere control device.This dew point controls dress
Put by the heating element heater in a PID controller control Watering trough or control hot and cold tank to inject certain body to Watering trough
Long-pending, certain flow ultra-pure water is adjusting dew point of atmosphere.
Notification number is CN201605295U, and the day for announcing is on October 13rd, 2010, and entitled " high-precision continuous annealing oven is used
The Chinese patent literature of damping device " discloses a kind of high-precision humidifying device for continuous annealing furnace, and it includes supplying adding of end
Wet device main body and intermediate storage tank, humidifier body includes seal groove, seal groove is connected with three sets of feeding pipes, respectively protects
Gas feed line, saturated vapor feeding pipe and pure water feeding pipe, the inlet end of intermediate storage tank passes through middle wet air duct
Road is connected with seal groove, and the aspirating end of intermediate storage tank is connected with annealing furnace by moisture pipeline, equipped with dew point hygrometer on intermediate storage tank,
Equipped with temperature sensor, signal is fed back to Dewpoint controller to the initial segment of middle moisture pipeline by temperature sensor and dew point hygrometer,
Dewpoint controller controls the flow control valve on saturated vapor feeding pipe.
Publication No. CN101287854A, publication date is on October 25th, 2008, the entitled " continuous annealing containing SI steel plate
The Chinese patent literature of hot dip coating method and continuous annealing hot dipping plating appts " relate to a kind of continuous annealing hot dip coating method and
Its device, the method is used for steel plate containing SI is carried out with the hot dipping plating appts of the annealing furnace of hot-dip, and the SI in steel will not be made to occur
Surface oxidation, but there is internal oxidation, to avoid the decline of plating performance and the delay of alloying of steel plate.Using successively
There is the continuous annealing hot dipping of heating tape leading portion, the annealing furnace of heating tape back segment, insulation belt and cooling zone and hot-dip tank
In electroplating method, the heating of the steel plate of humidity province at least more than 300 DEG C for the steel billet temperature or insulation are set as indirectly heat, will
Respectively the furnace atmosphere with section is set as hydrogen H:The atmosphere of 1～10VOL%, balance of nitrogen and inevitable impurity, in heating tape
Leading portion, the steel plate arrival temperature in heating is set as 550 DEG C～750 DEG C, dew point is set as -25 DEG C of deficiency, then will add
The dew point of tropical back segment and insulation belt is set as -30 DEG C～0 DEG C, the dew point of cooling zone is set as -25 DEG C of deficiency, and at this
Annealed under conditions of sample.
Content of the invention
It is an object of the invention to provide a kind of continuous annealing furnace atmosphere humidifying method, it can increase continuous annealing furnace
Interior humidity, to adjust the dew point of atmosphere in continuous annealing furnace, and efficiently avoid the oxidation of hearth inner lining and belt steel surface.
In order to reach the purpose of foregoing invention, the invention provides a kind of continuous annealing furnace atmosphere humidifying method, its bag
Include step：
The burning waste gas of the directly fiery bringing-up section of continuous annealing furnace are drawn into the radiant tube bringing-up section and all of continuous annealing furnace
Hot arc is to adjust the dew point of atmosphere of radiant tube bringing-up section and soaking zone.
Uneven to the atmosphere humidification in continuous annealing furnace for solving existing method, and easily cause hearth inner lining and strip
The problem of surface oxidation, the invention provides above-mentioned continuous annealing furnace atmosphere humidifying method.This continuous annealing furnace atmosphere increases
Wet method, using directly high temperature, high humidity waste gas produced by fiery bringing-up section burning, adds it to bringing-up section and the soaking of radiant tube
In section.Because EGT is typically up to 500-800 DEG C, on the one hand reduce the possibility of furnace gas condensation, on the other hand
Due to the weaker oxidation avoiding hearth inner lining and belt steel surface of the oxidisability of the humidified gas under the condition of high temperature.Again due to being straight
Waste gas produced by fiery bringing-up section burning, the mixing uniformity of its gas is good, is conducive to improving continuous annealing furnace atmosphere humidification
Efficiency and humidification uniformity.
For the more effective, dew point of atmosphere being precisely controlled in regulating stove, further, of the present invention continuous
In annealing furnace atmosphere humidifying method, the Dew-point Measurement Value according to described radiant tube bringing-up section and soaking zone and desired value, feedback
Control and flow into radiant tube bringing-up section and the burning waste gas amount of soaking zone from directly fiery bringing-up section.
Above-mentioned control method plays the role of good and effect for improving strip surface quality, especially can be well
Improve belt steel surface zinc layers adhesion in galvanizing manufacturing process for the strip.
Further, in continuous annealing furnace atmosphere humidifying method of the present invention, directly fire heating will be drawn from
The burning waste gas of section are passed through the directly furnace throat between fiery bringing-up section and radiant tube bringing-up section and are directly conveyed successively in continuous annealing furnace
To radiant tube bringing-up section and soaking zone, to adjust the dew point of atmosphere of radiant tube bringing-up section and soaking zone in the lump.
Can equably be diffused into by the burning waste gas located at the furnace throat between straight fire bringing-up section and radiant tube bringing-up section
Enter radiant tube bringing-up section and soaking zone, not only humidification uniformity is good, and humidification efficiency is high.It is capable of this control method simultaneously
Appliance arrangement structure simple, implementation steps are easy to operate.
Further, in continuous annealing furnace atmosphere humidifying method of the present invention, by burning waste gas from directly fire
Bringing-up section is drawn into outside continuous annealing furnace, and is respectively delivered to radiant tube bringing-up section and soaking zone in continuous annealing furnace again,
To adjust the dew point of atmosphere of radiant tube bringing-up section and soaking zone respectively.
By controlling the burning waste gas of the directly fiery bringing-up section respectively enteing radiant tube bringing-up section and soaking zone, to realize difference
The differentiation of the dew point of atmosphere of heat treatment process section controls, and is so more beneficial for efficiently controlling the atmosphere dew in continuous annealing furnace
Point.
Compared with the control method of existing furnace atmosphere dew point, continuous annealing furnace atmosphere humidification of the present invention
Method can be effectively prevented humidified gas and easily condense, it is to avoid hearth inner lining and belt steel surface easily aoxidize, and have humidification effect
Rate is high, the good feature of uniformity.
Additionally, the continuous annealing furnace atmosphere humidifying method of the present invention is in the dew point using radiant tube bringing-up section and soaking zone
Detected value and desired value, flow into the burning waste gas amount of radiant tube bringing-up section and soaking zone using feedback control from directly fiery bringing-up section
In the case of, it is possible to increase strip surface quality and improve strip processing technology effect.
Brief description
Fig. 1 is the structural representation of existing continuous annealing furnace.
Fig. 2 is a kind of continuous annealing of the embodiment realizing continuous annealing furnace atmosphere humidifying method of the present invention
The schematic diagram of stove.
Fig. 3 is continuously the moving back of another embodiment realizing continuous annealing furnace atmosphere humidifying method of the present invention
The schematic diagram of stove.
Specific embodiment
Below will be according to specific embodiment and Figure of description to continuous annealing furnace atmosphere humidification side of the present invention
Method is described further, but this illustrates not constitute the improper restriction to technical solution of the present invention.
Fig. 2 shows a kind of embodiment realizing continuous annealing furnace atmosphere humidifying method of the present invention.
As shown in Fig. 2 being respectively arranged with entry loop 11 He in continuous annealing furnace 10 along the two ends of the direct of travel P of strip
Outlet looping 12, is disposed with directly fiery bringing-up section 13 along its length in whole continuous annealing furnace, radiant tube bringing-up section 14,
Radiant tube soaking zone 15 and cooling section 16, are directly provided with furnace throat 17 between fiery bringing-up section 13 and radiant tube bringing-up section 14, in radiation
The exit of pipe soaking zone 15 is provided with exhaust equipment 18.
Please continue to refer to Fig. 2, by the step that furnace atmosphere humidification realized by the continuous annealing furnace shown in Fig. 2 it is：
1）By exhaust equipment 18, the gas in continuous annealing furnace 10 is suitably discharged, to change in continuous annealing furnace
Gas flow so that directly produced high temperature, high humidity waste gas in fiery bringing-up section 13（Including H2O and CO2）By being arranged at straight fire
Furnace throat 17 between bringing-up section 13 and radiant tube bringing-up section 14 is extracted away；
2）The high temperature being extracted, high humidity waste gas then sequentially enter in radiant tube bringing-up section 14 and radiant tube soaking zone 15；
3）Dew point of atmosphere in real-time detection radiant tube bringing-up section 14 and radiant tube soaking zone 15, the dew point recording is detected
Value and the dew point desired value setting are compared；
4）By the difference after comparing come the gas emissions of feedback control exhaust equipment 18, to control from directly fiery bringing-up section
13 flows entering into the burning waste gas in radiant tube bringing-up section 14 and radiant tube soaking zone 15, thus reach and adjusting in the lump and control
The purpose of the dew point of atmosphere of radiant tube bringing-up section processed and radiant tube soaking zone.
Further, since the volume of furnace throat 17 is larger, the diffusivity of waste gas is good, and thus, high temperature, high humidity waste gas can be equably
Enter in radiant tube bringing-up section 14 and radiant tube soaking zone 15, thus, it is for the increasing of the dew point of atmosphere in continuous annealing furnace
Wet uniformity is good, and humidification efficiency is high.In addition, up to 500-800 DEG C of the temperature of waste gas, on the one hand reduce humidified gas condensation
Risk, on the other hand avoids the oxidation of hearth inner lining and belt steel surface.
Fig. 3 then shows the another embodiment realizing continuous annealing furnace atmosphere humidifying method of the present invention.
As shown in figure 3, being respectively arranged with entry loop 21 He in continuous annealing furnace 20 along the two ends of the direct of travel P of strip
Outlet looping 22, sets gradually directly fiery bringing-up section 23, radiant tube bringing-up section 24, spoke along its length in whole continuous annealing furnace
Penetrate pipe soaking zone 25 and cooling section 26, be provided with pipeline in the exit of directly fiery bringing-up section 23, it is connected with exhaust equipment 28, with
Waste gas in straight fire bringing-up section 23 is expelled to outside continuous annealing furnace 20, in radiant tube bringing-up section 24 and radiant tube soaking zone 25
Exit is respectively provided with pipeline, and this pipeline passes through control valve 27 respectively and control valve 29 is connected with exhaust equipment 28, will be from straight
The waste gas that fiery bringing-up section 23 is discharged is introduced between in radiant tube bringing-up section 24 and radiant tube soaking zone 25.
From figure 3, it can be seen that due to being provided with exhaust equipment 28 in the exit of directly fiery bringing-up section 23, and this exhaust equipment 2
It is connected with control valve 27 and control valve 29 by pipeline respectively, so, continuous annealing furnace as shown in Figure 3 can pass through control valve
27 and control valve 29 being individually controlled the exhaust gas flow being transported to radiant tube bringing-up section 24 and radiant tube soaking zone 25, thus real
The differentiation of the dew point of atmosphere of existing radiant tube bringing-up section and radiant tube soaking zone controls.
Please continue to refer to Fig. 3, by the step that furnace atmosphere humidification realized by the continuous annealing furnace shown in Fig. 3 it is：
1）Will directly produced high temperature, high humidity waste gas in fiery bringing-up section 23 by exhaust equipment 28（Including H2O and CO2）Row
Go out outside continuous annealing furnace 20；
2）The high temperature that is discharged, high humidity waste gas pass through exhaust equipment 28, respectively via control valve 27 and control valve 29 successively
Enter in radiant tube bringing-up section 24 and radiant tube soaking zone 25；
3）Dew point of atmosphere in real-time detection radiant tube bringing-up section 24 and radiant tube soaking zone 25, the dew point recording is detected
Value and the dew point desired value setting are compared；
4）By the difference after comparing come the gas emissions of feedback control exhaust equipment 28, meanwhile, by control valve 27
To control the flow entering into the burning waste gas in radiant tube bringing-up section 14 and radiant tube soaking zone 15 with control valve 29 respectively, from
And can realize individually adjusting the function of the dew point of atmosphere of radiant tube bringing-up section and radiant tube soaking zone.
It should be noted that different steel grades are different for the dew point of atmosphere demand in continuous annealing furnace, therefore, radiation
In pipe bringing-up section and radiant tube soaking zone, set dew point desired value is also different.
The continuous annealing furnace atmosphere humidifying method of the present invention can realize the control of continuous annealing furnace furnace atmosphere dew point
Adjust, the dew point atmosphere overcoming continuous annealing furnace in prior art adjusts the oxidation easily causing hearth inner lining and belt steel surface,
And the defect of the easy condensation of humidified gas, to improving strip surface quality and its processing characteristics has good technique effect.
It should be noted that embodiment enumerated above is only the specific embodiment of the present invention.Obviously the present invention not office
It is limited to above example, the similar change made therewith or deformation are that those skilled in the art can be straight from present disclosure
Connect and draw or be easy to just to associate, protection scope of the present invention all should be belonged to.
Claims (4)
1. a kind of continuous annealing furnace atmosphere humidifying method is it is characterised in that include step：
The burning waste gas of the directly fiery bringing-up section of continuous annealing furnace are drawn into radiant tube bringing-up section and the soaking zone of continuous annealing furnace
To adjust the dew point of atmosphere of radiant tube bringing-up section and soaking zone.
2. continuous annealing furnace atmosphere humidifying method as claimed in claim 1 is it is characterised in that heat according to described radiant tube
Section and the Dew-point Measurement Value of soaking zone and desired value, feedback control flows into radiant tube bringing-up section and soaking zone from directly fiery bringing-up section
Burning waste gas amount.
3. continuous annealing furnace atmosphere humidifying method as claimed in claim 1 or 2 adds it is characterised in that directly fire will be drawn from
It is directly defeated successively in continuous annealing furnace that the burning waste gas of hot arc pass through the directly furnace throat between fiery bringing-up section and radiant tube bringing-up section
Deliver to radiant tube bringing-up section and soaking zone, to adjust the dew point of atmosphere of radiant tube bringing-up section and soaking zone in the lump.
4. continuous annealing furnace atmosphere humidifying method as claimed in claim 1 or 2 is it is characterised in that by burning waste gas from straight
Fiery bringing-up section is drawn into outside continuous annealing furnace, and is respectively delivered to radiant tube bringing-up section and soaking zone in continuous annealing furnace, with
Adjust radiant tube bringing-up section and the dew point of atmosphere of soaking zone respectively.
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| CN201410155850.9A CN105018714B (en) | 2014-04-17 | 2014-04-17 | Method for humidifying atmosphere in continuous annealing furnace |
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| CN201410155850.9A CN105018714B (en) | 2014-04-17 | 2014-04-17 | Method for humidifying atmosphere in continuous annealing furnace |
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| CN105018714B true CN105018714B (en) | 2017-02-22 |
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| CN112481484B (en) * | 2020-11-10 | 2022-04-01 | 马鞍山钢铁股份有限公司 | Dew point self-adaptive control method for hot-dip galvanized products with different alloy components |
| CN113215386B (en) * | 2021-05-14 | 2023-03-14 | 宝钢湛江钢铁有限公司 | Device and method for increasing humidity in strip steel continuous annealing furnace |
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| BR9506724A (en) * | 1994-12-02 | 1997-09-23 | Kawasaki Stell Corp | Non-oxidizing heating method and apparatus |
| JP2005120448A (en) * | 2003-10-17 | 2005-05-12 | Chugai Ro Co Ltd | Method for controlling bright annealing furnace |
| JP5733121B2 (en) * | 2011-09-12 | 2015-06-10 | Ｊｆｅスチール株式会社 | In-furnace atmosphere adjustment method for continuous heat treatment furnace |
| WO2013153791A1 (en) * | 2012-04-09 | 2013-10-17 | Ｊｆｅスチール株式会社 | Method for lowering dew point of ambient gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet |
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