수소를 환원제로 사용한 산화철의 유동 환원에서, 환원율에 대한 다양한 공정 변수를 통해 산화철의 하나인 적철광의 환원 거동을 면밀히 관찰하였다. 본 연구를 위해 특별히 설계된 실험실 규모의 유동층 장치에서 목적으로 하는 환원 특성에 대한 가스 속도, 환원 시간 및 온도의 최적 값을 평가 하였다. 최적의 환원율을 나타낸 온도는 750 ℃, 환원 시간은 30분이며 이들을 다음의 시험을 위한 시작점으로 매개 변수 값을 설정 하였다. 가장 높은 관심을 갖는 변수들 중 하나는 가스의 소비 원단 위로, 이는 최적의 조건에서 산화철 1톤을 기준하여 90% 이상의 환원율을 달성하기 위해 요구되는 가스의 양을 말한다. 이 매개 변수는 실험실 수준 장치의 스케일 엎에 있어서 중요한 인자이며, 본 연구를 통해 1,500 Nm3/ton-ore가 산화철이 가장 높은 환원율을 갖기 위한 최적의 가스 소비 원단위 임을 확인하였다.
수소를 환원제로 사용한 산화철의 유동 환원에서, 환원율에 대한 다양한 공정 변수를 통해 산화철의 하나인 적철광의 환원 거동을 면밀히 관찰하였다. 본 연구를 위해 특별히 설계된 실험실 규모의 유동층 장치에서 목적으로 하는 환원 특성에 대한 가스 속도, 환원 시간 및 온도의 최적 값을 평가 하였다. 최적의 환원율을 나타낸 온도는 750 ℃, 환원 시간은 30분이며 이들을 다음의 시험을 위한 시작점으로 매개 변수 값을 설정 하였다. 가장 높은 관심을 갖는 변수들 중 하나는 가스의 소비 원단 위로, 이는 최적의 조건에서 산화철 1톤을 기준하여 90% 이상의 환원율을 달성하기 위해 요구되는 가스의 양을 말한다. 이 매개 변수는 실험실 수준 장치의 스케일 엎에 있어서 중요한 인자이며, 본 연구를 통해 1,500 Nm3/ton-ore가 산화철이 가장 높은 환원율을 갖기 위한 최적의 가스 소비 원단위 임을 확인하였다.
Hematite reduction using hydrogen was conducted and the various process parameters were closely observed. A lab scale fluidized bed unit was designed especially for this study. The optimal values of the gas velocity, reduction time and temperature were evaluated. The values which indicated the highe...
Hematite reduction using hydrogen was conducted and the various process parameters were closely observed. A lab scale fluidized bed unit was designed especially for this study. The optimal values of the gas velocity, reduction time and temperature were evaluated. The values which indicated the highest reduction rate were set as fixed parameters for the following tests starting with the reduction time of 30 minutes and 750 ℃ of temperature. Among these variables the one with the highest interest was the gas specific consumption. It will tell the amount of the gas which is required to achieve a reduction rate of over 90% at the optimal conditions. This parameter is important for the scale up of the lab scale unit. 1,500 Nm3/ton-ore was found to be the optimal specific gas consumption rate at which the reduction rates exhibit the highest values for hematite.
Hematite reduction using hydrogen was conducted and the various process parameters were closely observed. A lab scale fluidized bed unit was designed especially for this study. The optimal values of the gas velocity, reduction time and temperature were evaluated. The values which indicated the highest reduction rate were set as fixed parameters for the following tests starting with the reduction time of 30 minutes and 750 ℃ of temperature. Among these variables the one with the highest interest was the gas specific consumption. It will tell the amount of the gas which is required to achieve a reduction rate of over 90% at the optimal conditions. This parameter is important for the scale up of the lab scale unit. 1,500 Nm3/ton-ore was found to be the optimal specific gas consumption rate at which the reduction rates exhibit the highest values for hematite.
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문제 정의
Temperature, reducing gas flow velocity, iron ore sample amount and the gas flow rate are among operating conditions with the impact on the reproducibility discussed in numerous studies, where these operating parameters were varied to achieve the optimal iron ore direct reduction parameters. The key aim is to find the parameter which is mainly responsible for reduction rate control. Authors in the work Turkdogan et al.
제안 방법
In the Table 1 the test conditions are listed. All the tests were conducted at the same room conditions by varying the test para- meters of interest such as gas flow rate, sample amount, reaction temperature and reaction time.
Hematite samples were prepared and tests were con- ducted using a lab scale fluidized bed reactor. The main aim was to find out as to which extent these parameters influence the DR process and find out their effect on the hydrogen gas consumption rate, which would help the scale up process.
대상 데이터
[6] have conducted ex- perimental study on the hydrogen steelmaking process and developed a reduction model. Hematite cubes were used for the experiments. In their work they found that the hydrogen, com- pared to CO, as reducing agent exhibited an acceleration of the reduction process indicating a possibility to reduce the rector size compared to the current DR facilities and help reducing the CO2 emissions by more than 80%.
For the reduction process hydrogen was used. Hematite samples were taken directly from the yard and screened in a mesh of the size 300 m. Hematite particle size and distribution was measured using Particle Size Distribution Analyzer (TSI, model 3603) and the data are displayed in the Figure 2.
후속연구
For the scale-up purpose the data from these test can be very useful to calculate the fluidized bed dimen- sions and gas consumption rate. After enlargement of the test facility further tests are required to confirm the data presented in this study.
참고문헌 (9)
Chatterjee, A. Sponge Iron Production by Direct Reduction of Iron Oxide. PHI Learning Pvt. Ltd., 2010.
Turkdogan, E. T., and Vinters, J. V., "Gaseous Reduction of Iron Oxides: Part I. Reduction of Hematite in Hydrogen," Metallurg. Mater. Trans. B, 2(11), 3175-3188 (1971).
Turkdogan, E. T., Olsson, R. G., and Vinters, J. V., "Gaseous Reduction of Iron Oxides: Part II. Pore Characteristics of Iron Reduced from Hematite in Hydrogen," Metallurg. Mater. Trans. B, 2(11), 3189-3196 (1971).
Turkdogan, E. T., and Vinters, J. V., "Gaseous Reduction of Iron Oxides: Part III. Reduction-oxidation of Porous and Dense Iron Oxides and Iron," Metallurgical Trans., 3(6), 1561-1574 (1972).
Pang, J. M., Guo, P. M., Zhao, P., Cao, C. Z., Zhao, D. G., and Wang, D. G., "Reduction of 1-3 mm Iron ore by H 2 in a Fluidized Bed," Int. J. Minerals, Metallurgy and Mater., 16(6), 620-625 (2009).
Da Costa, A. R., Wagner, D., and Patisson, F., "Modelling a New, Low CO 2 Emissions, Hydrogen Steelmaking Process," J. Cleaner Production, 46, 27-35 (2013).
Feilmayr, C., Thurnhofer, A., Winter, F., Mali, H., and Schenk, J., "Reduction Behavior of Hematite to Magnetite under Fluidized Bed Conditions," ISIJ Int., 44(7), 1125-1133 (2004).
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