Catalyst for converter
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The activity of the conversion catalyst in our plant has declined; we are now adding sulfur to the gasifier. Will this help to re-sulfurize the catalyst?
Reply to 1# ymhmohan: If you used low-sulfur coal varieties in the past, catalyst desulfidation may have occurred; increasing the sulfur content can have some effect in this regard
This post was last edited by 654262293 on 2011-9-29 11:36. If it is confirmed that the catalyst degradation is caused by desulfurization, it will have a certain effect. If the catalyst’s activity has decreased due to sulfidation, it is recommended to shut down the plant for re-sulfidation.
It can cause re-sulfurization of the catalyst, but the effect is short-lived
What should we do if it’s just high-sulfur coal?
Reply to 3# 654262293: Check what catalyst is being used for the transformation; it’s the activity of that particular section that is poor
It’s not a long-term solution; the high sulfur content affects subsequent processing stages
You must be using a sulfur-resistant shift catalyst, right? There are various reasons for a decline in catalyst activity: First of all, what is the specific model of the catalyst used by your company? How long has this catalyst been in use? The typical service life of a conversion catalyst is around 3-5 years; it needs to be replaced due to the deposition of pollutants and a decrease in specific surface area. If this usage condition has not yet been met, check the previous operating conditions; generally, it is required that the H2S or sulfur content in the process gas fed into the converter be above 500PPM to prevent reverse sulfidation.
Reply to 3# 654262293: If desulfurization has occurred, it is generally not necessary to stop the process and carry out sulfurization again, after all, the sulfur content in the process gas cannot be zero. By adding a certain amount of CS4 or a sulfiding agent to the gas introduced in the gasification section or startup section, it is possible to achieve gradual sulfidation of the shift catalyst; the length of time required for re-sulfidation depends on the catalyst model.
Reply to 9# zaizuo: If, as you say, sulfurization is not necessary as long as the water gas contains a certain amount of sulfur, then how can sulfurization still occur when there is a certain amount of sulfur in the water gas? Additionally, under production conditions, CS2 or sulfur is added for vulcanization; with such high space velocities, how is it controlled? That’s not realistic! Furthermore, what an enormous amount of carbon disulfide or sulfur would be required. It’s completely unfeasible! ! !
It is recommended to use a combination of high-sulfur and low-sulfur coals to adjust the sulfur content in water gas in order to meet the process requirements.