Method for assessing passivation effect of iron sulfides

Abstract

The invention provides a method for assessing the passivation effect of iron sulfides. A gas supply apparatus comprises an inert gas bottle, an oxygen-rich air bottle, a steam generator and a hydrogen sulfide bottle, the gas supply apparatus is connected with a passivation apparatus through respective pipelines, and supplies a gas to the passivation apparatus, a sample is disposed on the tray of the passivation apparatus, direct sulfuration of the sample can be realized when a hydrogen sulfide gas is introduced into the passivation apparatus, and the iron sulfides are prepared through a reaction of hydrogen sulfide and iron oxide, have high activity, and are close to the condition activity. Safe operation boundary parameters capable of realizing good passivation effect, obvious economic benefit and safe and reliable operation can be found through changing of the concentaration and amount of oxygen introduced in the passivation process and through comparison of a large amount of experiments in order to find the rapid passivation reaction conditions of the iron sulfides in water steam and oxygen, so safety guarantee is provided for maintenance of a tower, a tank and a kettle in an industrial apparatus.

Description

technical field [0001] The invention belongs to the technical field of passivation evaluation of iron sulfur compounds, and in particular relates to a method for evaluating the passivation effect of iron sulfur compounds. Background technique [0002] At present, the methods used in industry to prevent spontaneous combustion of sulfur iron compounds mainly include isolation method, cleaning method and passivation method. The isolation method is very effective in online protection, but it is difficult to achieve it in the process of shutting down for maintenance; although the cleaning method can thoroughly clean the sulfur-iron compound, this method has high processing costs, unsafe and complicated operation, and is easy to damage during the processing process. Corrosion of equipment, difficult post-processing, and easy pollution to the environment; generally after passivation method, sulfur-iron compounds will still adhere to the surface of the equipment and cannot be remove...

AI Technical Summary

Problems solved by technology

Because it is gas-phase passivation, so the contact surface is relatively wide, the full contact time is long, the passivation is uniform, there is no channeling phenomenon, and the recovery of waste gases such as sulfur dioxide by lye is safe and environmentally friendly; however, the ferrous sulfide prepared by this method , compared with the sulfur-iron compounds produced under working conditions, the activity is lower, and the temperature rise generated during the passivation process is lower, so it is difficult to simulate the spontaneous combustion situation under maintenance conditions

Images