Latest ArticlesIn this paper, it is analyzed the cause for frequent damage of electric butterfly valve for CSQ coke quenching car is the working condition cannot be met. The fault of water drain valve is completely solved and the moisture of coke after quenching can be ensured by taking away the electric butterfly valve, redesigning and replacing with the "cover plate valve" with pneumatic control, which could completely meet the technological requirements so that the target of transformation is achieved.
As a key spare part in the production, the working status and service life of material chute of blast furnace directly affect the stable production of blast furnace. In this paper, it is introduced the service life of material chute is improved by studying and analyzing the reasons for its shorter life as well as redesigning, remanufacturing and using new materials, which plays a positive role in the stable and trouble-free running of blast furnace.
In this paper, it is introduced the development process of video monitoring system and video protocol, analyzed the current situation and existing problems for video monitoring system as well as the purpose and significance of video monitoring system integration in Baotou Steel. The feasible integration scheme for several video monitoring systems with different private codes and transmission control protocols is proposed, which is with certain practical values.
In this paper, it is mainly introduced the principle and implementation method of double cross-limit control as well as the parallel cascade combustion control system based on double cross-limiting is designed on the basis of briefly elaborating the technological process of hot blast furnace. The practical applications show that the automatic control for combustion and blowing-in of hot blast stove can be realized as well as the combustion efficiency and control accuracy of hot blast stove are greatly improved with the system so that hot blast stove can operate safely and efficiently.
On the premise of constant production and operation of gas desulfurization system, such goals as reducing its operating load, stabilizing the operation of desulfurization facilities and reducing the emission concentration of pollutants at outlet are achieved through taking such measures as adjusting the proportioning of sintering raw material structure, controlling the temperature and flow rate of flue gas as well as improving the efficiency of main electrostatic precipitator.
In this paper, it is considered to be the main cause for decline of dissolved oxygen that the load of organic matter in aerobic tank increases rapidly by analyzing the typical example for decline of dissolved oxygen in aerobic tank of biochemical system for coking waste water. Verified by experiment, the concentration of dissolved oxygen in aerobic tank could return to normal within 1~2 days by taking such measures as increasing the aeration rate of aerobic tank, adding the water with low COD concentration into aerobic tank and strictly controlling the amount of organic matter entering aerobic tank.
It is a key link to detect the oxygen and nitrogen content in rail blanks in the production of rails. In this paper, it is mainly elaborated the method for preparing oxygen and nitrogen sample with drilling of hollow drill instead of traditional gas cutting forging. The experiment results showed that the method could meet the production requirements. Moreover, the process flow was simplified, sample preparation cycle was shortened, cost of sample preparation was reduced and timeliness of data was ensured compared with the method for preparing oxygen and nitrogen sample with gas cutting forging.
The effects of manual and automatic measurements on the measurement results are discussed through analyzing the measurement of percentage elongation after fracture of cold-rolled steel plate produced by Baotou Steel. The results showed that there were some differences between the percentage elongations after fracture with manual and automatic measurements as well as the original gauge length and fracture position were determining factors. When the measurement requirements for percentage elongation after fracture of metallic material are more accurate, manual measurement should be adopted to ensure measurement results to be closer to the mechanical characteristics of material itself.
In the paper, the series of tempering tests of quenched 75 kg/m bainite rail in laboratory are introduced as well as the mechanical properties and microstructure of the rails with different tempering processes are compared and analyzed. The results showed that the optimum mechanical properties of test rails could be achieved with 320 ℃ heat preservation for 48 h, which could satisfy the operating requirements of rail for heavy haul railway.
In the paper, it is introduced the exploratory study on low temperature reagent is carried out in view of the mineral characteristics and climatic conditions of Bayan Obo Iron Mine. Compared with the original flotation reagent, the flotation temperature can reduce to about 30 ℃ with the new low temperature reagent, the grade of iron concentrate increases by 0.22 percentage points and the recovery rate increases by 1.26 percentage points.
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