Experimental device of iron ore pellets during drying and preheating processes and method thereof

Abstract

The invention relates to an experimental method of iron ore pellets during drying and preheating processes and a device thereof, which belong to the field of iron making. The device comprises a damping machine, a blower, a transducer, an electric heater, a heater controller, a clean-up port, a pressure-measuring ring chamber, a suspension bracket, a suspension basket, an electronic balance, a standard gas interface, a cylinder manifold, a valve, a PLC, a thermohygrometer, a thermograph, a flowmeter, a speedometer, a hygrometer, a computer, an injector, a commutation section, a porous medium air-distributing device, and the like. In the invention, simulation flue gas after being commutated can be produced, the experimental simulation comprises the processes of heat transfer, mass transfer and chemical reaction of the flue gas under the conditions of different humidity contents, different mol components, different flow field distribution, different temperature levels and different heating rates, and the simulation of the drying and preheating processes in actual production of the iron ore pellets provides more valuable reference frame for the actual production.

Description

technical field [0001] The invention belongs to the field of ironmaking production, and relates to an experimental device and method for the drying and preheating process of iron ore pellets. Background technique [0002] Iron ore pellets are important raw materials for blast furnace ironmaking and shaft furnace direct reduction, and the drying and preheating processes have an important impact on their quality. Whether it is the grate-rotary kiln process or the belt roaster process, the heat recovery gas is used to dry and preheat the green pellets. The heat recovery gas is usually the product gas after the blown air reacts with the pellets in the cooling section or the hot flue gas reacts with the pellets in the preheating section. Oxygenation and other reactions reduce the oxygen partial pressure; using such a gas to dry and preheat pellets has a different effect than directly using air to dry and preheat pellets. [0003] On the other hand, the flow field distribution h...

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Problems solved by technology

The heat recovery gas is usually the product gas after the blown air reacts with the pellets in the cooling section or the hot flue gas reacts with the pellets in the preheating section. Oxidation and other reactions reduce, resulting in a decrease in oxygen partial pressure; using such a gas to dry and preheat the pellets, compared with directly using air to dry and preheat the pellets, the effect is different

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