A microwave drying system for sintered fuel

Abstract

The application discloses a microwave drying system for sintered fuel. The drying system comprises a microwave drying box body (1), wherein the microwave drying box body (1) is internally provided with a microwave generator (2), a sintered fuel tray (3) for containing the sintered fuel, an internal temperature sensor (4) for monitoring the internal temperature of the sintered fuel, and a surface temperature sensor (5) for monitoring the surface temperature of the sintered fuel and a processor (6). By arranging the internal temperature sensor which can insert into the sintered fuel and the surface temperature sensor capable of detecting the surface temperature of the sintered fuel, the internal temperature and the surface temperature of the sintered fuel are detected in real time; and the output power of the microwave generator is adjusted according to the internal temperature, the surface temperature and the temperature difference value, and the output power of the microwave generatorfor drying the sintered fuel is intelligently controlled.

Description

technical field [0001] The present application relates to the technical field of microwave drying, in particular to a method and device for controlling the microwave drying temperature of sintered fuel. Background technique [0002] The particle size composition of iron ore sintered solid fuel is an important parameter to determine the sintering process. It is generally believed that the particle size of sintered fuel should reduce the content of two particle sizes of -0.5mm and +3mm, and increase the proportion of particle size of 0.5mm-3mm. Because the initial particle size of the fuel is relatively coarse, it needs to be crushed by a crusher before entering the sintering batching system. In order to control the particle size of the fuel in production, it is necessary to detect the particle size of the fuel. At present, the methods used to detect the composition of the particle size of the fuel are mainly through manual sampling, and the sieving method is used for grading...

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Problems solved by technology

Usually, the microwave power cannot be adjusted during the microwave drying process and remains constant. If the power is not properly controlled, it will not only cause energy waste, but also cause safety accidents

[0004] Usually, the microwave power is set according to the empirical value, and this empirical value is obtained according to the sintered fuel with a specific particle size and a specific water content, but for different batches of samples, the particle size and water content are different, so , the empirical value is unreliable for different batches of samples

[0005] At present, there is a method to adjust the microwave output power according to the surface temperature of the sintered fuel. Because microwaves have the characteristics of penetrating into the sintered fuel for heating, the use of microwaves to dry the sintered fuel will cause the water in the sintered fuel core to diffuse slower than the surface layer, and the sintered fuel material layer The internal moisture content is higher than that of the surface layer, so the internal heating rate of the sintered fuel material layer is faster than that of the surface layer. The method of adjusting the microwave power only according to the temperature of the sintered fuel surface layer is not reliable. Moreover, the sintered fuel is dried with microwaves, and the temperature of the sintered fuel presents Non-linear, when the temperature of the sintered fuel reaches a certain value, there will be a sudden change in temperature, that is, thermal runaway. It often happens that the sintered fuel at the core has burned, but the sintered fuel on the surface has not burned, which leads to the destruction of the sample and cannot be used

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