Reducing Refractory Material Consumption Since the graphite electrode of the DC furnace is located in the center of the furnace, the current and heat distribution in the molten pool are relatively uniform, and there is no overheating zone, 'therefore, the loss rate of the refractory material is significantly reduced, and due to the age of the furnace Extend, so that the overall consumption of refractory materials is reduced by approximately 50-60%. Reducing metal loss The great fluctuation of current in AC furnace leads to frequent exchange of hot and cold gas in the furnace, resulting in high metal oxidation rate and large loss; while in Dc furnace, the current is stable, the voltage fluctuation is small, and the airflow exchange in the furnace is small, so Less oxidation of molten steel, high metal yield. Noise A significant reduction in the powerful noise caused by arc flashing in AC furnaces is unacceptable in an extremely wide range. In DC furnaces, the arc flashing tone is greatly reduced, and the pollution and adverse effects on the surrounding environment are greatly reduced. The electrode control system simplifies the use of DC power in the DC furnace and has a small number of network cables. Due to the single electrode operation, the structure is simple, which greatly simplifies the electrode control system and greatly facilitates the maintenance and overhaul of the equipment. Improved metallurgical control effect The DC furnace's molten pool is DC-stirred to improve the homogeneity of the molten steel, the metallurgical control effect is improved, and the quality of the steel is improved; the interference to the power system is greatly reduced, and the power supply capacity of the power grid is improved. The overall equipment has a simple structure, low cost, low investment, and low construction costs.
Furnace bottom conductivity is the main characteristic of DC furnaces. From the working methods of the bottom anode structure of DC furnaces that have been put into operation at present, it can be basically divided into two categories: the first is the use of conductive furnace bottom refractories as anodes, and the second is for inlaying furnaces. The metal element in the bottom refractories serves as the anode. This can be divided into three types: 1. A composite anode composed of multiple steel sheets; 2. A composite anode composed of multiple steel rods; 3. An anode composed of 3-4 steel rods. In order to avoid local hot spots on the bottom of the furnace, this structure is generally no less than three steel bars. The refractory materials around the components, the working environment and working conditions in which they are located are very strict and demanding. Therefore, there is a need for refractory products with particularly good properties. This is undoubtedly an unprecedented challenge for refractory stainless steel tank manufacturers. Of course, on the other hand, it also provides a great opportunity for manufacturers with competitive strength to show their skills. In the following, we will discuss the working characteristics of the furnace bottom anodes with different structures under specific operating conditions, as well as their requirements for their respective required refractories performance requirements and their problems. So that the refractory material manufacturers can research and develop the special refractory materials with the best practical performance.
The steel sheet composite anode structure and the refractory steel sheet composite anode structure are a furnace bottom conductive structure designed by Florida Iron and Steel Company of the United States without seeking a suitable conductive furnace bottom refractory material. This is a composite hearth anode consisting of a number of groups of steel sheets with a thickness of approximately 1.7 mm interposed in the middle of the bottom of the furnace. They are a plurality of groups of fan-shaped conductive elements formed by circularly arranging a plurality of steel plate-shaped fan-shaped elements around the center of the hearth, respectively, forming a group of concentric circles. The height of the steel sheet and the thickness of the hearth are all about 1 meter. Kai Teng is not an outstanding pottery. The conductivity of the hearth is a typical feature of a DC furnace. Also regardless of the conductive refractory material, but also the conductive metal Figure 3 steel sheet-type conductive structure in each fan-shaped conductive element composed of multiple pieces of steel, the distance between each two pieces of steel is about 90mm. These fan-shaped conductive elements are fixed to the bottom shell insulated from the ground and cooled by the air. Between the steel sheets, the monolithic refractories, which are mainly composed of magnesia, are filled and knotted and densely packed. At the same time, 12 thermocouples were evenly distributed to measure the temperature of the furnace bottom in order to understand the erosion of the furnace bottom. In this hearth-bottom electrode system, the conduction of current is conducted through the hearth via a conductive network of these steel sheets.
A Blind flange is round plate which has all of the relevant boltholes but no center hole, and because of this feature this flange is used to close off the ends of a piping systems and pressure vessel openings. It also permits easy access to the interior of a line or vessel once it has been sealed and must be reopened.
The blind flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes. This blind flange is available in various sizes and materials and is used to provide positive closer on the ends of pipes, valves or equipment nozzles. This flange helps in easy access to a line once it has been sealed. The blind flange is sometimes custom made or machined to accept a nominal sized pipe to which reduction is being made.
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