Pellet cooling exhaust gas recycling and utilizing system and using method

Abstract

The invention relates to a using method of a pellet cooling exhaust gas recycling and utilizing system. A chain grate, a chain grate upper cover, an air bellow of the chain grate upper cover, a rotarykiln, a ring cooler, a ring cooler upper cover, an air bellow of the ring cooler upper cover, a cooling fan, a dry air blowing machine, a pipeline and a valve are included. The using method is characterized in that a third cold section upper cover and a fourth cold section upper cover of the ring cooler communicate with each other to form a cooling rear section upper cover, and the cooling rear section upper cover is connected with a cooling exhaust gas temperature adjustment system. The cooling exhaust gas temperature adjustment system includes an exhaust pipe I, an exhaust pipe II, an exhaust pipe III, a regulating valve I, a regulating valve II, a cooling exhaust gas returning main pipe, three cooling exhaust gas returning branch pipes and a regulating valve III. The using method has the advantages that exhaust gas of pellet cooling links is totally recycled and used, the heat loss is reduced, the energy consumption of the system is reduced, the temperature adjustment means of theexhaust gas is provided, and hot airflow at the appropriate temperature is provided to the chain grate and the rotary kiln to serve as a heat source.

Description

technical field [0001] The invention belongs to the technical field of pellet production in the iron and steel metallurgical industry, and in particular relates to a pellet cooling waste gas recovery and utilization system and a use method. Background technique [0002] At present, the chain grate machine-rotary kiln-circular cooler process is one of the main production processes for iron ore pellet production. [0003] On the chain grate machine, the green balls are heat-treated, and the drying and preheating process of the green balls is completed through the cross-flow heat exchange between the hot air flow and the material layer. According to the traditional hot air process, the chain grate machine is divided into four sections according to the temperature of the hot air flow and the way it passes through the material layer. Along the direction of material advancement, there are blast drying section, exhaust drying section, preheating section 1 and preheating section 2. ...

AI Technical Summary

Problems solved by technology

[0014] If the hot air temperature of a certain section of the chain grate machine is low, the process of this section of the chain grate machine will be moved backward, which will increase the fuel consumption and affect the output, and seriously cause the preheating ball index to be low, resulting in an increase in the amount of dust in the rotary kiln , looping and other consequences that affect production

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