A chain grate machine hot air system

Abstract

The invention relates to a hot air system for a chain grate machine, comprising a chain grate machine, an upper cover, an air box, a hot air pipe and a kiln tail cover. The preheating front section and the preheating rear section; the bellows are divided into a drying bellows, an outer exhaust bellows, a heat recovery bellows I and a heat recovery bellows II, the blow dry bellows correspond to the blast drying section, and the outer exhaust bellows Corresponding to the exhaust drying section and the transition section, the reheating air box I corresponds to the preheating front section, and the regenerating air box II corresponds to the preheating rear section, and the hot flue gas collected by the regenerating air box I is fed by the reheating fan I sent to the upper hood of the extraction and drying section; the hot flue gas collected by the heat recovery air box II is sent to the upper hood of the transition section by the heat recovery fan II; the upper hood of the preheating front section is connected to the exhaust gas pipeline of the secondary cooling section. The invention has the advantages that: the thermal system of the chain grate machine can be adjusted according to the actual raw material conditions to meet the needs of producing different types of pellets.

Description

technical field [0001] The invention belongs to the technical field of iron ore pellet production, and particularly relates to a hot air system for a chain grate machine. Background technique [0002] At present, the chain grate machine-rotary kiln-ring cooler process is one of the main production processes in the production of iron ore pellets. The traditional hot air process is to divide the chain grate machine into three chambers (groups) and four sections. The upper cover of the chain grate machine is divided into four sections in turn by the method of passing the material layer: the blast drying section, the exhaust drying section, the first section of preheating, and the second section of preheating; The chain grate bellows are divided into three groups: the first group of bellows corresponds to the blast drying section, and receives the cooling exhaust gas from the upper cover of the third cooling section of the ring cooler as the medium for blast drying; the second g...

AI Technical Summary

Problems solved by technology

However, the hot air (generally 850°C~1050°C) entering the upper hood of the second preheating stage and the second preheating stage comes from the rotary kiln, and both the second preheating stage and the second preheating stage can only be used as the second preheating stage Therefore, the length of each section of the chain grate machine is still fixed, the residence time of the pellets in the drying and preheating stages is relatively fixed, and the raw material adaptability is still not very ideal

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