What are the reasons for the darkening of sulfur blocks produced during coking and sulfur melting?
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In the process of producing sulfur blocks by heating in a sulfur melting furnace, the resulting sulfur blocks are black in color. What is the reason for this? Please give your advice
Look further back! Primary cooling, electrostatic carbon capture!
It is mainly due to the effect of tar; iron-based or tannin-based desulfurizers can also have an impact.
It is necessary to clarify what desulfurization process is in use in order to make an accurate judgment.
The main reason for darkening is the high tar content in the gas; there may also be impurities such as dust and naphthalene. It is necessary to check whether the operating parameters of the electrostatic precipitator and the scrubber in the previous process stage are normal
If desulfurization is carried out after crude benzene, it could also be caused by entrainment in the washing oil
Generally, wet flue gas desulfurization is carried out after blast condensation and before ammonia removal. Based on past experience, the widespread use of high-pressure ammonia-based smokeless coal charging has led to an increase in coal dust carried in the gas. Although most of the tar and coal dust is removed through spraying in the primary cooler, electrostatic tar collectors, ionization, and the use of blowers, some tar and coal dust still enter the desulfurization system along with the gas. This is the main reason why molten sulfur turns black; of course, there may be other reasons as well.
I personally think it is still the effect of tar. On one hand, the electrostatic tar collector should be cleaned; if there is a pre-cooling tower, the remaining ammonia water after oil removal can be used for spraying
Talk about what the process is; you can also check if the primary condenser is clogged