Chain grate hot air system

Abstract

The invention relates to a chain grate hot air system. The chain grate hot air system comprises a chain grate machine, an upper cover, air bellows, a hot air pipeline and a kiln tail cover, and is characterized in that the chain grate machine upper cover is divided into an forced air drying section, a down-draft drying section, a transition section, a preheating front section and a preheating rearsection, the air bellows are divided into an air blow drying bellow, an outer exhaust bellow, a heat return air bellow I and a heat return air bellow II, the air blow drying bellow corresponds to theforced air drying section, the outer exhaust bellow corresponds to the down-draft drying section and the transition section, the heat return air bellow I corresponds to the preheating front section,the heat return air bellow II corresponds to the preheating rear section, hot smoke collected by the heat return air bellow I is conveyed to the down-draft drying section upper cover through the heatreturn air bellow I, the hot smoke collected by the heat return air bellow II is conveyed to the transition section upper cover through the heat return air bellow II, and the preheating front sectionupper cover is connected with a secondary cooling section waste gas pipeline. The chain grate hot air system has the advantages that the thermal regulation of the chain grate can be adjusted accordingto actual raw material conditions, and the requirements for producing different types of pellets are met.

Description

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

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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