Pre-heating device and pre-heating method of sulfate slag pellet ore

Abstract

The invention provides a pre-heating device of pellet ore, comprising a chain grate which is divided into a first drying section, a second drying section, a first pre-heating section and a second pre-heating section in sequence; an eleventh air supplying pipeline is arranged between the second pre-heating section and the second drying section, the fume discharged from the second pre-heating section enters into the second drying section through the eleventh air supplying pipeline, and the second drying section is connected with a host blast stove which is used for supplying hot air to be mixedwith the low temperature fume of the material layer in the second drying section. The invention provides an air stove connected with the second drying section to supply hot air, the temperature of the hot air is controlled to raise the temperature of the mixed air with the low temperature fume to be above the acid dew point of the low temperature fume, thus preventing acid dew from being formed and corroding tail gas treatment devices.

Description

technical field [0001] The invention relates to a device for preparing metallurgical raw materials, in particular to a preheating device and a preheating method for sulfuric acid slag pellets. Background technique [0002] Pellet is one of the main raw materials for blast furnace ironmaking and direct reduced iron. Pellets have several advantages over sinter. For example, the mechanical strength of pellets in the cold state is higher than that of sintered ore, so it is not easy to be broken and cracked during transportation, loading and unloading and storage, with less consumption and less powder produced, which is conducive to improving the air permeability of the blast furnace material column and making the furnace The airflow inside is evenly distributed. In the prior art, it is a common method to prepare pellets by using the grate machine-rotary kiln method. The grate machine-rotary kiln method has been widely used because of its many advantages such as good product q...

AI Technical Summary

Problems solved by technology

Therefore, even if a part of the flue gas from the preheating section is bypassed to the exhaust end of the second drying section and mixed with the flue gas entering the electrostatic precipitator, the temperature of the mixed gas will still be lower than the acid dew point of the flue gas, so the flue gas It is easy to form acid mist and corrode the subsequent exhaust gas treatment equipment

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