Some Introductions of the Design the Temperature and Prefabricated Parts
Iron ditch is one of the important facilities of blast furnace ironmaking. When drawing iron, the high temperature hot metal first enters the main iron ditch to achieve the separation of slag and iron, and then the hot metal enters the hot metal ladle through the branch ditch to enter the later stage of steelmaking system. The iron slag goes into the slag ditch and is reused after water quenching. At present, the main trench structure of blast furnace is composed of steel shell, insulation layer, permanent layer and working layer from outside to inside. The permanent layer is usually made of clay brick, or clay or high aluminum castable is poured on site. The above design has the following defects: First, clay brick masonry, lack of overall structure. During the repair process of iron ditch, clay brick and insulation layer fall off, and the amount of pouring material in the main ditch is increased when the main ditch is re-poured, and the insulation performance of the wall of the iron ditch is reduced, which increases the cost of the iron making process. The second is the use of on-site direct casting mode, although the integrity of the permanent layer is solved, but the on-site support mold, casting, maintenance, baking construction time is long, labor intensity is high, the quality of the casting body is difficult to guarantee. At the same time, the strength of clay or high aluminum castable and the performance of resistance to hot metal is poor, which is seriously damaged in the process of multiple repairs and disassembly, and can not play the role of protecting the working layer, often because of the main trench working layer material problems, resulting in iron groove leakage, resulting in quality accidents and large economic losses.
Main Breakthroughs in Ironmaking
In view of the above defects, a new type of iron trench permanent layer prefabricated parts. Its characteristics are as follows: First, the high strength iron groove prefabricated parts made of recycled raw materials are made of iron groove, and the strength of normal temperature and high temperature reaches more than 80MPa, which ensures that the prefabricated parts will not be damaged during the demolition and repair process, and the reasonable use of resources is made. Second, according to the different conditions of use above and below the iron groove, the prefabricated parts are divided into three layers, and the materials are also different, which controls the cost of manufacturing. Third, the technology of post-pouring belt is used to seal the joints between the prefabricated parts, reduce the appearance accuracy requirements of the manufacturing, and ensure that there will be no leakage of hot metal in the case of iron leakage in the main ditch, which greatly improves the safety and reliability of the operation of the iron ditch. Fourth, the special lifting trolley is designed, which improves the efficiency of installation and reduces the labor intensity of workers, and can complete the construction of an iron ditch within 12 hours under normal circumstances, and is directly put into use without baking. Fifth, on the back of the prefabricated parts, a temperature measuring device is reserved, which can monitor the temperature of the iron groove wall when the customer needs it and predict the service life of the iron groove in time. With the increasing demand of iron and steel enterprises for the safety of BF gully operation, the technology of prefabricated parts of permanent layer of main gully will be popularized and applied rapidly.