Segmented cooling system of belt type roasting machine

Abstract

The invention relates to a sectional cooling system of a belt type roasting machine. The sectional cooling system of the belt type roasting machine comprises a belt type roasting machine body, the belt type roasting machine body is divided into an forced air drying section, a down-draft drying section, a preheating section, a roasting section, a soaking section and an blast cooling section along the material flow direction, an air bellow is divided into four, the sectional cooling system of the belt type roasting machine further comprises a first air blower, a second air blower, a cooling exhaust fan, a silencer, a temperature measuring device I and a temperature measuring device II, wherein the blast cooling section is divided into a blast cooling front section, a blast cooling rear section and a down-draft cooling section, and the fourth air bellow is divided into a blast cooling front section air bellow, a blast cooling rear section air bellow and a down-draft cooling air bellow. The sectional cooling system of the belt type roasting machine has the advantages that airflow direction of the blast cooling rear section penetrates through a material layer from top to bottom, the cooling effect is improved, the cooling speed is increased, the belt type roasting machine utilization rate is increased, the service life of a finished belt type roasting machine is prolonged, power consumption of a cooling fan is reduced, and heat exchange conditions of the forced air drying section are improved.

Description

technical field [0001] The invention belongs to the technical field of iron ore pellet production, and in particular relates to a segmental cooling system of a belt roaster. Background technique [0002] At present, the belt roaster process is one of the main production processes for iron ore pellet production. The traditional hot air process divides the belt roaster into seven sections and the bellows into four groups according to the air flow direction and equipment functions. Along the material flow direction, the seven sections are blast drying section, exhaust drying section, preheating section, roasting section, soaking section, cooling section 1, and cooling section 2. The bellows are grouped as follows: [0003] 1) The first group of bellows corresponds to the blast drying section. The airflow comes from the blower dryer, and the bellows pass through the material layer from bottom to top and enter the upper cover to perform preliminary drying on the raw balls. The ex...

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Problems solved by technology

[0008] Using the above-mentioned traditional technology, both the first cooling stage and the second cooling stage adopt the blast cooling method, and the air flow passes through the material layer from bottom to top. Heating is not conducive to the gas-solid heat exchange process

In order to prevent the temperature of the upper layer of pellets from being too high and meet the conditions of belt conveyor transportation, it is necessary to allow the pellets to stay on the roaster for a sufficient time. When the temperature of the upper layer of pellets drops to an acceptable level, the lower layer of pellets The mine will be over-cooled, and the temperature will be close to the ambient temperature, causing the cooling fan to do useless work

Moreover, prolonging the cooling time will waste the area of ​​the belt roaster and reduce the utilization rate of the equipment

When using the layered distribution technology of green balls, the green balls with larger particle size are distributed to the upper part of the material layer, which will further aggravate the situation

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