The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and b...The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and benzoic acid as the transferred substance between water and oil. The results show that, with lance level of 2.1m and the top blowing rate of 25000Nm3/h, the volumetric mass transfer coefficient changes most significantly when the bottom blowing rate ranges from 384 to 540Nm3/h. The volumetric mass transfer coefficient reaches its maximum when the lance level is 2.1m, the top blowing rates is 30000Nm3/h, and the bottom blowing rate is 384Nm3/h with tuyeres located symmetrically at 0.66D of the converter bottom.展开更多
The bottom blowing element is the key equipment to ensure the bottom blowing effect of the converter.Three types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),we...The bottom blowing element is the key equipment to ensure the bottom blowing effect of the converter.Three types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),were built,and the effects of bottom blowing element type on molten bath flow,wall erosion and furnace bottom erosion were simulated.It was found that when the bottom blowing elements of dispersive type(D1)and double circular seam(D2)were used,the dead zone area in the lower part of the molten bath was smaller,and the high-speed zone area was larger;therefore,the stirring effect on the bottom melt was better.When the straight cylinder type(D3)bottom blowing element was used,the gas penetrated the molten bath at a faster rate to reach the surface of molten bath and failed to disperse in the bottom molten bath,and the wall shear stress near the nozzle outlet was larger.When argon was blown by three different bottom blowing elements,the area of the wall shear stress greater than 3 Pa was 4.8,5.6 and 8.7 cm2,respectively,within 0.2 m of the bottom blowing nozzle outlet.展开更多
By measuring the volume concentration of SO<sub>2</sub> produced,blow rate of air（m<sup>3</sup>/min）Band converting times τ,the mathematical model of converting for oxidizing FeS and Cu<s...By measuring the volume concentration of SO<sub>2</sub> produced,blow rate of air（m<sup>3</sup>/min）Band converting times τ,the mathematical model of converting for oxidizing FeS and Cu<sub>2</sub>S,and that of controlling end point can be developed according to the slag making period andcopper making period,respectively.This derived model may be well suitable for either sideblow or top blow converter if the parameters-SO<sub>2</sub>B,τ.can be measured accurately.展开更多
The high efficient blowing technique includes increasing oxygen supply intensity and optimizing slag forming. The oxygen supply intensity on 300 t converters of No. 1 steelmaking shop at Baosteel reaches 3.83 m^3/（t ...The high efficient blowing technique includes increasing oxygen supply intensity and optimizing slag forming. The oxygen supply intensity on 300 t converters of No. 1 steelmaking shop at Baosteel reaches 3.83 m^3/（t · min）, and at Taiyuan Steel, Lianyuan Steel, Pingxiang Steel and other steel plants, the oxygen supply intensity on medium converters is in the range of 4.0--4.4m^3/（t · min）. The productivity of converter can be increased by 8% -- 15% with adopting this technique. The whole technique, including design and manufacture of lance nozzle with reasonable pacnolontenue of outlets, technique of oxygen supply and slag forming, has been developed by CISRI to meet the need of technique transfer.展开更多
With the importance of the steelmaking industry in the economy and its negative impacts on the environment,reducing dust emissions is a vital focus in this field.Thus,the theory of dust generation in converter steelma...With the importance of the steelmaking industry in the economy and its negative impacts on the environment,reducing dust emissions is a vital focus in this field.Thus,the theory of dust generation in converter steelmaking process was analyzed and the influence of bottom blowing oxygen on dust generation was obtained through experimental research.The industrial test was carried out in a 120-t bottom combined blown O_(2)–CaO steelmaking converter.The results show that lowering the lance position can reduce the amount of dust.This emission rate of the converter is also found to be in direct proportion to the decarburization rate.As a result,the proposed bottom blowing O_(2)–CaO steelmaking converter can technically reduce the amount of dust and improve the recovery rate of iron.With more bottom blowing oxygen,the dust content is lower with the dust peak appearing earlier.The evaporation theory,followed by the bubble theory,plays the primary role in the dust generation of bottom blowing oxygen steelmaking.It points out the direction for the technology research and development of reducing dust generation.展开更多
文摘The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and benzoic acid as the transferred substance between water and oil. The results show that, with lance level of 2.1m and the top blowing rate of 25000Nm3/h, the volumetric mass transfer coefficient changes most significantly when the bottom blowing rate ranges from 384 to 540Nm3/h. The volumetric mass transfer coefficient reaches its maximum when the lance level is 2.1m, the top blowing rates is 30000Nm3/h, and the bottom blowing rate is 384Nm3/h with tuyeres located symmetrically at 0.66D of the converter bottom.
基金funded by the Joint Fund Project of Shaanxi(Grant No.2021JLM-32)the General Project of National Natural Science Foundation of China(Grant No.52374346).
文摘The bottom blowing element is the key equipment to ensure the bottom blowing effect of the converter.Three types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),were built,and the effects of bottom blowing element type on molten bath flow,wall erosion and furnace bottom erosion were simulated.It was found that when the bottom blowing elements of dispersive type(D1)and double circular seam(D2)were used,the dead zone area in the lower part of the molten bath was smaller,and the high-speed zone area was larger;therefore,the stirring effect on the bottom melt was better.When the straight cylinder type(D3)bottom blowing element was used,the gas penetrated the molten bath at a faster rate to reach the surface of molten bath and failed to disperse in the bottom molten bath,and the wall shear stress near the nozzle outlet was larger.When argon was blown by three different bottom blowing elements,the area of the wall shear stress greater than 3 Pa was 4.8,5.6 and 8.7 cm2,respectively,within 0.2 m of the bottom blowing nozzle outlet.
文摘By measuring the volume concentration of SO<sub>2</sub> produced,blow rate of air（m<sup>3</sup>/min）Band converting times τ,the mathematical model of converting for oxidizing FeS and Cu<sub>2</sub>S,and that of controlling end point can be developed according to the slag making period andcopper making period,respectively.This derived model may be well suitable for either sideblow or top blow converter if the parameters-SO<sub>2</sub>B,τ.can be measured accurately.
文摘The high efficient blowing technique includes increasing oxygen supply intensity and optimizing slag forming. The oxygen supply intensity on 300 t converters of No. 1 steelmaking shop at Baosteel reaches 3.83 m^3/（t · min）, and at Taiyuan Steel, Lianyuan Steel, Pingxiang Steel and other steel plants, the oxygen supply intensity on medium converters is in the range of 4.0--4.4m^3/（t · min）. The productivity of converter can be increased by 8% -- 15% with adopting this technique. The whole technique, including design and manufacture of lance nozzle with reasonable pacnolontenue of outlets, technique of oxygen supply and slag forming, has been developed by CISRI to meet the need of technique transfer.
基金the National Natural Science Foundation of China(Grant Nos.51574021 and 51474024)the Fundamental Research Funds for the Central Universities(FRF-TP-19-031A1).
文摘With the importance of the steelmaking industry in the economy and its negative impacts on the environment,reducing dust emissions is a vital focus in this field.Thus,the theory of dust generation in converter steelmaking process was analyzed and the influence of bottom blowing oxygen on dust generation was obtained through experimental research.The industrial test was carried out in a 120-t bottom combined blown O_(2)–CaO steelmaking converter.The results show that lowering the lance position can reduce the amount of dust.This emission rate of the converter is also found to be in direct proportion to the decarburization rate.As a result,the proposed bottom blowing O_(2)–CaO steelmaking converter can technically reduce the amount of dust and improve the recovery rate of iron.With more bottom blowing oxygen,the dust content is lower with the dust peak appearing earlier.The evaporation theory,followed by the bubble theory,plays the primary role in the dust generation of bottom blowing oxygen steelmaking.It points out the direction for the technology research and development of reducing dust generation.
