Latest ArticlesIn this paper, it is introduced the design and construction process for high-formwork support system, focused on checking and analyzing the support system of beam. The measures and suggestions for its construction management including the selection of supporting formwork materials, calculation of load for supporting formwork and setting up of formwork support are put forward, which could be as reference for the constructions of other similar projects.
The uncertainty of manganese content in SWRH82B steel determined with spark source emission spectrometry is evaluated according to the "Evaluation Specification for Uncertainty of Measurement Results for Low Alloy Steel with Spark Source Emission Spectrometry", the main sources as well as such components affecting uncertainty as measurement repeatability, standard values of standard samples and curve fitting are analyzed. Finally, the combined standard uncertainty and expanded uncertainty are calculated as well as the main factors affecting uncertainty are found out. The test results showed that the uncertainty caused by standard values of standard samples is the main source of uncertainty with this method. When the manganese content in SWRH82B steel is 0.69%, its expanded uncertainty is 0. 02% (k = 2). Based on the analysis of uncertainty, an analytical method for determining the uncertainty of manganese content in SWRH82B steel is established, which provides the scientific basis for reasonably evaluating the laboratory test results.
In this paper, the operation mode of power supply, protective relaying setting and ability of anti-interference electricity for medium and low voltage power network are discussed, the causes for tripping of electric equipment caused by voltage dip are analyzed as well as the corresponding control measures are proposed to reduce the economic losses caused by accidents by taking an accident of voltage dip caused by the fault of short circuit of power network as an example.
In this paper, the main causes for influencing the accuracy of coal blending in large capacity silos are obtained by analyzing its factors. The corresponding solutions are proposed based on the process flow and characteristics of equipment for large capacity silos so that the accuracy of coal blending is effectively improved.
Since the 7# blast furnace of Baotou Steel was blown on, its operations have been stable based on strengthening the quality management of crude fuel. The furnace condition is gradually stable and trouble-free as well as various technical indicators are greatly improved through actively adjusting various systems as well as quantifying, standardizing and optimizing operations.
Due to the overall downward trend of quality of crude fuel and the material leakage of central throat pipe, the air flow of blast furnace was disordered and the furnace condition was seriously abnormal. The trend for deterioration of furnace condition is significantly remitted and the blast furnace conditions gradually tend to be stable by such means as shrinking material batch, reducing coke load, increasing furnace temperature, decreasing alkalinity, strengthening the management of tapping, replacing central throat pipe and distributing chute, adjusting the distributing system, shrinking the area of intake air from tuyere, increasing the amount of water inflow of cooling wall and decreasing the temperature of water inflow.
The whole campaign life for 4# blast furnace of Baotou Steel is up to 18 years, which is at the advanced level in the technical practices of long campaign technology for large and medium-sized blast furnaces in China. It was found that the elephant foot shaped erosion was at the junction of hearth and furnace floor by investigation and sampling analysis for the state of erosion for hearth and furnace floor of 4# blast furnace of Baotou Steel. Moreover, its reasons are analyzed emphatically.
In the paper, it is introduced such difficulties as the poor thermal property of coke, high content of the harmful element in the furnace, poor air permeability of stock column and difficult adjustment of initial air flow distribution are overcome by such measures as adjusting the blowing-in system and charging system under the condition of the two 4 150 m3 blast furnaces of Baotou Steel with economic furnace burden so that the problems of bending and damage of tuyere are solved as well as the period of trouble-free operation for blast furnace is prolonged.
In the pellet production, the amount of bentonite is an important factor affecting the grade of pellet ore, utilization coefficient of blast furnace and coke ratio. Its affecting factors are discussed and the solutions are put forward combining with the production reality that the amount of bentonite leaps in Rare Earth Steel Iron-making Plant, which play an important role in effectively reducing the amount of bentonite in pelletizing, improving the grade and metallurgical properties of pellet ore.
The flame cutting of continuous casting billet is the key link of continuous casting as well as the flame cutting with high efficiency and low energy consumption is the development direction for the flame cutting of continuous casting. The two dual-flow slab continuous casting machines in Rare Earth Steel Plate Plant of Baotou Steel adopt new oxyhydrogen cutting technology, which is with such advantages as neat cutting section, small kerf, few burr and low energy consumption.
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