Start-up method of fluidized bed roaster

Abstract

The invention relates to a start-up method of a fluidized bed roaster, which is characterized by comprising: firstly preparing a start-up material from pyrite with a sulfur mass fraction of 35% or more and pure sulfur; selecting dry slag as the bed layer base material; and carrying out oil-injection ignition to heat the bed layer of the roaster, introducing air when the roaster bed temperature reaches about 250 DEG C to maintain the material bed at a micro-boiling state, slowly adding a small amount of the start-up material, wherein a part of pure sulfur in the start-up material reaches the ignition point and begins burning to emit heat during the micro-boiling heating process, controlling the heating rate at 50 DEG C/h or lower under the micro-boiling condition with the outlet temperature of the fluidized bed roaster as the reference, closing an oil gun and stopping the oil heating system when the bed material temperature reaches 700 DEG C to complete start-up operation, and then transferring to the normal production of the fluidized bed roaster. Practical use proves that the start-up method provided by the invention achieves the intended purpose and is suitable for the start-up operation of the fluidized bed roaster for production process of sulfuric acid from pyrite.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for starting up a fluidized roaster in the production process of sulfuric acid. Background technique [0002] In the process of sulfuric acid production, the boiling roaster is usually used to prepare sulfur dioxide by roasting pyrite. The usual way to start the boiling roaster is to increase the bed temperature of the roaster to 845-855°C, and then turn the feeding into normal. This method is used for starting up. For a long time, due to the influence of factors such as the nozzle form of the oil gun and the combustion status, it is difficult to raise the temperature of the bottom material in the roasting furnace. , which is not conducive to feeding. Contents of the invention [0003] The object of the present invention is to provide a practical and effective start-up method of a fluidized roasting furnace in order to overcome the defects of the prior art...

AI Technical Summary

Problems solved by technology

[0002] In the process of sulfuric acid production, the boiling roaster is usually used to prepare sulfur dioxide by roasting pyrite. The usual way to start the boiling roaster is to increase the bed temperature of the roaster to 845-855°C, and then turn the feeding into normal. This method is used for starting up. For a long time, due to the influence of factors such as the nozzle form of the oil gun and the combustion status, it is difficult to raise the temperature of the bottom material in the roasting furnace. , is not conducive to feeding