In metallurgical production, magnetic-impulse installations of medium and high energy intensity of IM3, IM4 and IM5 types are widely used. The ability to select the required value of stored energy allows using them on a wide variety of objects – hoppers from hundreds of kilograms to thousands of tons. Practically at any stage of technological process of steel production – from the ore reception to its smelting the positive experience in the use of magnetic-impulse installations IM exists.
Review by ArcelorMittal Kriviy Rih
Review by Metinvest Holding Mariupol
Receiving hoppers for ore, iron ore concentrate, limestone, bauxite, coal, etc. (from 100 tons and above).
Receiving hoppers for ore, iron ore concentrate, limestone, bauxite, coal, etc. (from 100 tons and above).
They are characterized by high humidity of the loaded material, prone to sticking, and to freezing to the walls in winter, are subject to intense abrasive wear, must have high mechanical resistance to static and dynamic loads, therefore they have tight ribbing of side walls. They are usually made of a pyramidal shape. When equipping by magnetic-impulse installations IM, in most cases are equipped by vibrating sheets of 10–20 mm thickness, that simultaneously perform the function of a lining. Vibrating sheets allow not only to obtain the oscillations of the required amplitude as a result of impulsed mechanical action, but also contribute to their spreadingn over a larger area of the surface to be cleaned. Depending on the volume of the hoppers and the characteristics of the loaded material, they are equipped with executive mechanisms in one or two tiers with allocation from 1 to 4 executive mechanisms on each side of the hopper. Type of the used installations IM4 and IM5 with maximum stored energy from 14,4 to 22,5 kJ.
Бункеры шихтовые, дозировочные, агломашин.
Характеризуются увеличенной вместимостью (от 200 т и выше), повышенной слеживаемостью загружаемого материала и повышенными требованиями к равномерности процесса выгрузки. При трапецеидальной форме аналогично приемным бункерам оборудуются вибролистами, при конической форме импульсное воздействие производится непосредственно на внешнюю стенку. Оснащаются исполнительными механизмами установок ИМ обычно в два яруса. Типы применяемых установок ИМ4 и ИМ5 с максимальной запасаемой энергией от 14,4 до 22,5 кДж.
Transfer chutes from conveyor to conveyor, loading and unloading chutes of primary and secondary mixing drums, pelletizing drum, intermediate hoppers.
They are characterized by a tendency to fast clogging as a result of sticking or freezing of a fine wet fraction of the transported material, which falls into chutes, having, moreover, a high speed. They are equipped with lining sheets, that with a certain fixation to the body of chute, are used as vibrating sheets for the executive mechanisms of magnetic-impulse installation. The type of the used installations IM3 with a maximum stored energy of 3,6 – 8,1 kJ.
Surge plates for loading trolleys of sintering machines.
They are characterized by tight proper ribbing, prone to sticking of bulk material, high ambient temperature, possibility of unauthorized flame emissions from the sintering machine. They are equipped with vibrating sheets, flame deflectors of a special design, and a heat-resistant current-carrying cable is used in the executive mechanisms. The type of the used installations IM3 with a maximum stored energy of 5,4 kJ.
Feed funnels and hoppers of coneless loading devices (CLD) of blast furnaces.
They are characterized by a large thickness of the side walls (up to 30 mm) and the presence of lining plates of a relatively small size up to 100 mm thick, fixed to the walls with bolts, without the possibility of mounting the vibrating sheets, high wall temperature (up to 400 °C), the need for outdoor operation. Funnel and hoppers CLD on one blast furnace are equipped with one magnetic-impulse installation with 8 executive mechanisms on the funnel and two executive mechanisms on each hopper. Types of installations IM4 and IM5 with a maximum stored energy of 22,5 kJ.
Dosing hoppers of the skip pit of blast furnaces.
They are characterized by a large thickness of the side walls (up to 20 mm), tight ribbing, and the presence of lining plates. The impulse effect is produced on the side walls of hoppers by means of executive mechanisms located in the number of two on each wall. Types of installations IM4 and IM5 with a maximum stored energy of 14,4 – 22,5 kJ.
In addition to the listed options, magnetic-impulse IM installations at the metallurgical industries are successfully used in:
- blast-furnace production on hoppers of aspiration sites, collection and shipment of dust;
- foundry production on the hoppers of sand throwers, molding, knockout, mixture preparation, spill cleaning, farming;
- converter production in supply hoppers of the material supply path;
- coke production on silos of a storage of coal concentrates, dosing hoppers, hoppers of coal towers;
- alumina production at the bauxite receiving hoppers of the grinding section and at the hoppers of the coagulation section.
Along with the traditional use in hoppers and chutes, installations IM are also used for shaking hoses during the regeneration of frameless bag filters, for cleaning metal sieves of coke screens, convective heating surfaces (thermosyphons) in evaporative cooling devices and waste heat boilers,for cleaning gondola railcars as part of a railcar dumper.
You can learn more about the use of installations IM in various scopes of metallurgical production at the following links:
Implementations map
Magnetic-impulse installations IM:
- ensure a sustainable release of material from equipped hoppers;
- clean the walls of hoppers from adhered material;
- provide efficient filter regeneration;
- operation in an energy-saving mode, operating costs are minimal;
- basically do not require reconstruction of hoppers when equipping them;
- do not violate the integrity of the walls of the hoppers;
- compatible with strain gauge systems for controlling the weight of material in hoppers;
- comply with the requirements of the Directives and harmonized technical regulation of the European Union on electrical safety and electromagnetic compatibility;
- applicable in hazardous areas of class 22, hazardous by ignition of combustible dust in accordance with the ATEX Directive;
- easily integrated into modern automated process control systems;
- reliable and durable (according to technical conditions – 10 years, in practice, some installations have already been in operation for more than 25 years).