Heat preservation is able to bear or endure the application of talent skill aims to reduce steel contract for a job to make a hot loss, reduce loss of hydro-thermal of Cheng Fang steel thereby. Concerned heat preservation is carried out to be able to bear or endure on existing steel bag material technical reformation, the change that need considers to include steel space and weight is controlled small, and cannot affect original build by laying bricks or stones to build technology. Through transforming, reduce molten steel Wen Jiang and steel bag carapace external heat radiation, improve stability of molten steel temperature and efficiency of the mould that connect casting, the high temperature radiate that reduces relevant facility at the same time is damaged.
1 steel includes analysis of model of loss of quantity of heat
Model of loss of steel bag quantity of heat sees a picture 1. Can see from inside the graph, the molten steel hot loss cent in steel bag is heat radiation of face of molten steel broken bits, steel to wrap housing heat radiation and steel Bao Naicai heat stores 3 parts. Efficient heat-insulation layer reduces steel to include temperature on one hand, reduce steel to include case external the loss of quantity of heat that heat radiation produces, increase the heat of steel Bao Naicai to store on the other hand, achieve the goal that reduces molten steel Wen Jiang, reduce at the same time be able to bear or endure material temperature is fluctuant, lengthen be able to bear or endure material service life.
Steel includes plan of model of loss of quantity of heat
Graph attempt of model of loss of quantity of heat of 1 steel bag
2 heat preservation are able to bear or endure material build by laying bricks or stones is built
The common step that steel includes builds means and heat preservation to be able to bear or endure material build by laying bricks or stones builds means contrast to see a picture 2. Manufacturing characteristic should be united in wedlock when build by laying bricks or stones is built, do not affect existing working layer and integral sky to include weight,
Steel wraps build by laying bricks or stones to build comparative figure
Graph build by laying bricks or stones of 2 steel bag builds comparative figure
3 processes contrast is analysed
3.1 processes temperature is measured
3.1.1 steel include housing temperature change
Choose steel to plant Q235B, SPHD, be planted by steel and craft method undertakes contrast, contrast on one hand plant with craft method steel differ below the condition be able to bear or endure the temperature including case that material steel includes, on the other hand below condition of method of comparative and different technology two kinds are able to bear or endure carapace of material steel bag is different the temperature change difference of area. Steel bag carapace is different average temperature and poor value see position watch 1.
From the watch 1 can see, plant with steel below method condition, use heat preservation is able to bear or endure material steel wraps Biputongnai the temperature including case that material steel includes is low different steel plants 52 ℃ ; below method condition, heat preservation is able to bear or endure the temperature including case that material steel includes changes small; of material steel bag never is the same as Biputongnai steel is planted comparative data sees way, steel wraps degree of housing Wen Jiang to differ, demonstrative heat preservation is able to bear or endure the use of material affected model of loss of the heat inside steel bag.
Different steel is planted and carapace of bag of the steel below craft method condition measures lukewarm contrast
Watch 1 different steel is planted and carapace of bag of the steel below craft method condition measures lukewarm contrast
Wen Jiang of process of 3.1.2 molten steel changes
Choice craft method is " Lian Zhu of → of station of converter → argon " steel is planted Q235B and craft method are " Lian Zhu of → of vacuum of RH of → of station of converter → argon " steel is planted SPHD, analytic heat preservation is able to bear or endure the effect that material steel includes Wen Jiang of pair of molten steel process. Q235B and SPHD steel are different be able to bear or endure temperature of process of molten steel of material steel bag sees a table respectively 2.
Q235B and SPHD steel are different be able to bear or endure Wen Jiang of process of smelt of molten steel of material steel bag
Watch 2 Q235B and SPHD steel are different be able to bear or endure Wen Jiang of process of smelt of molten steel of material steel bag
From the watch 2 data look, below the premise that temperature includes among contented Lian Zhu, heat preservation is used to be able to bear or endure when there is SPHD of smelt of apparent difference; when the converter terminus temperature of smelt Q235B steel is using different steel to wrap the converter terminus temperature that material steel includes reduces 10 ℃ .
Circumstance of change of temperature of 3.2 molten steel reachs case study
Wen Jiang of 3.2.1Q235B molten steel
To " Lian Zhu of → of station of converter → argon " craft method steel is planted Q235B, to Lian Zhu from converter terminus the bag intermediate makes an appointment with the Wen Jiang that produces 100 ℃ , basically have the following 3 drop in temperature dot.
Agitate of ① molten steel
Include converter to put steel to blow argon agitate and argon station processing to blow argon agitate inside, in argon station condition of the different strength that blow argon falls, wen Jiang differs about 1 ℃ , it is the critical factor of Wen Jiang of molten steel process.
② steel wraps hot loss and manufacturing rhythm
Do not play argon situation in molten steel, common be able to bear or endure material steel wraps minutely Wen Jiang to make an appointment with 0.5 ℃ , normal periodic error 10min, wen Jiang changes 5 ℃ .
③ alloy is changed
Include to add up to Troy and alloy to turn an opportunity, plant with steel alloy quantity photograph falls with the circumstance, alloy turns an opportunity lesser to the influence of molten steel Wen Jiang.
3.2.2SPHD steel Wen Jiang
To " Lian Zhu of → of vacuum of RH of → of station of converter → argon " craft method steel is planted SPHD, arrive from converter terminus among Lian Zhu wrap Wen Jiang to be 125 ℃ about, basically have the following 4 drop in temperature dot.
① molten steel blows argon agitate
Point to put steel to begin argon station to handle an end from converter, the molten steel that molten steel causes in the agitate in steel bag is lukewarm during this process fall.
② RH vacuum handles Wen Jiang
The because vacuum is groovy absorption of heat, circumfluent,aeriform agitate causes molten steel Wen Jiang in showing in RH vacuum handles a process.
③ steel wraps hot loss and manufacturing rhythm
Common be able to bear or endure the Wen Jiang that material steel bag does not blow argon circumstance to fall in molten steel makes an appointment with 0.5 ℃ Min. 10min of normal and periodic error, wen Jiang changes 5 ℃ .
④ alloy is changed
Include to add up to Troy and alloy to turn an opportunity, steel is planted reach alloy to measure same situation to fall, alloy turns an opportunity lesser to the influence of molten steel Wen Jiang.
3.2.3 case study
From drop in temperature drop analysis can see, to " Lian Zhu of → of station of converter → argon " craft method steel is planted molten steel, the station that blow argon blows argon intensity bigger to the influence of molten steel Wen Jiang, masked different steel to include the effect of pair of molten steel Wen Jiang. "Lian Zhu of → of vacuum of RH of → of station of converter → argon " craft method steel is planted the Wen Jiang influencing factor of molten steel is stable, the variation of molten steel temperature that uses different steel to wrap place to bring about is apparent.
3.3 different be able to bear or endure material steel bag is right the effect that molten steel temperature includes in Lian Zhu
The analysis wraps molten steel temperature to change among casting repeatedly, from Lian Zhu temperature of the water including steel intermediate needs a value (temperature of bag molten steel differs Lian Zhu of the T= that be worth Δ among Lian Zhu T of average of molten steel temperature is wrapped to make the same score among Lian Zhu of T- of temperature of molten steel of the bag intermediate, difference of temperature of bag molten steel is worth change to differ among the Lian Zhu of different technology method, if pursue,3 are shown.
Use different and fireproof data difference of temperature of intermediate bag molten steel is worth comparative figure
Graph 3 use different be able to bear or endure the temperature of molten steel of the bag intermediate when Q235B of material steel Bao Lianzhu and SPHD steel differs a value to contrast
From the graph 3 can see, heat preservation is able to bear or endure material steel Bao Tongpu is connected be able to bear or endure material steel bag is compared, come from former molten steel to fluctuate in the temperature that includes among Lian Zhu small, more the stability of molten steel temperature in be helpful for joining casting course.
Epilogue
In smelt process, use heat preservation to be able to bear or endure the steel bag of talent skill, on one hand steel hydro-thermal loss can reduce 10 ℃ , on the other hand steel encrusts temperature can reduce 50 ℃ , rose to reduce converter tapping temperature, energy-saving fall the bad news and temperature of mould of stable molten steel, function that improves Lian Zhu efficiency, the heat radiation that also reduced related to steel bag equipment at the same time is damaged.
Get Price
WhatsApp