Latest ArticlesIn the paper, it is described the blast furnace operation instruction is laid down based on the daily change of furnace condition with coke quality reduction through standardized operations of blast furnace. The furnace condition becomes stable and long-term trouble-free operations of blast furnace are realized in Iron-making Plant through strengthening management and control of blast furnace as well as organizing the related technology workers to carry out daily examination and weekly analysis to find out the subtle changes of furnace condition in time and adjust them.
In the paper, the influence factors for sinter production of 265 m2 sintering machine in Iron-making Plant of Baotou Steel are analyzed. With the existing production line, such measures as increasing the utilization coefficient and reducing inefficient operations are proposed and implemented so that the sinter production is steadily increased from 4.81 million t in 2016 to 5.34 million t in 2017, which makes a contribution for improving the ratio of sinter put into furnace and reducing the production costs of iron making.
In this paper, the important way for removing alkalis is determined to be the blast furnace slag and the main way for removing zinc is determined to be the fly ash through analyzing the content of such harmful elements as K, Na and Zn in crude fuel for blast furnace of Baotou Steel as well as the balance calculation of output and discharge. Moreover, the methods and measures for reducing the enrichment of alkali and zinc in blast furnace are discussed. The effects of harmful elements on blast furnace are effectively reduced by such measures as controlling the content of alkali and zinc in incoming raw materials, dealkalizing and dezincification for scraps as well as decreasing basicity of slag and adsorption of lumpy zone.
The stability of 4# blast furnace of Baotou Steel became worse and the fluctuation became more with the continuous deterioration of crude fuel condition. The stability ratio of furnace temperature is increased significantly and the long-term stable trouble-free operation of 4# blast furnace is realized through reasonably matching the operating duties, keeping the two gas flows reasonably distributed, controlling reasonable Tf value, strengthening tapping iron management in cast house and operations in furnace as well as implementing the standard operations.
In the initial stage of production for 6# blast furnace in Iron-making Plant of Baotou Steel, the hydraulic clay gun was rotated horizontally when plugging tap hole due to its design defects. In order to ensure the hydraulic clay gun to plug tap hole smoothly, the designed elevation of the top surface for side of in and tap drain was lowered by 250 mm so that the vertical height of it and tap hole center line was 375 mm. As a result, the jet of slag and iron was prolonged when tapping, the impact abrasion of tap drain was intensified and its service time was shortened. The impact abrasion of jet of slag and iron to tap drain was reduced and its service life was prolonged by improving the sizes of its each part so that the goal of reducing the labour intensity and refractory consumption was achieved.
The iron making is a high-risk metal smelting industry and there are many unsafe factors. In recent years, various production accidents in the industry stay at a high level, so the safety situation is more serious. Iron-making Plant takes the idea of "comprehensive safety, intrinsic safety and continuous safety" as well as insists on the principles of "manage production, business and industry must manage safety" "person in charge is responsible" and "party and government are with the same responsibility, double duty for a post". The safety grid management is implemented in the whole plant so that the safety production responsibility system is strengthened as well as all safety management systems and operating instructions are implemented.
In the paper, it is analyzed the causes and summarized the treatment experiences for temperature increase of 5# blast furnace hearth sidewall of Baotou Steel. As a result, it is effectively controlled within a safe range by implementing the furnace protection measures and adding titaniferous furnace burden for furnace protection so that the safe production and long service life of blast furnace are ensured.
In this paper, the process of replacing SIEMENS S5 115U control system of ring crane for 4# blast furnace of Iron-making Plant of Baotou Steel with SIEMENS SIMATIC S7-300 PLC is mainly introduced. Moreover, the main hardware constitution and the implementation method for the software function of the system are given; the transformation plan for control system of ring crane and the applications of core component FM351 are especially elaborated.
In the paper, the maximum value of load for the chute to each component of distributing device in the entire rotation and tilting process is calculated by analyzing the structure of BGIII distributing device of Baotou Steel. The load capacities of motor and oil cylinder are checked and calculated by establishing the reasonable mechanical model, which has proved the original design and type-selection were reasonable, provided the basic data support for the structural improvement and stress calculation of other components as well as the theoretical support for the structure optimization of distributing device.
In this paper, the vibration of rolling ring of mixing machine caused by serious abrasion and deformation is analyzed as well as the causes for vibration of mixing machine are found out through long-term tracking measurement. The vibration of barrel is effectively reduced even eliminated by grinding rolling ring of mixing machine with grinding machine, which makes the sintering productions stable.
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