Inhibiting Silicate Formation in Desulfurization Sorbent Regeneration
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Solution Overview
Problem
The formation of silicates during the regeneration of sulfur-laden sorbents in desulfurization systems reduces their desulfurization activity, as these inert compounds occupy active sites, and conventional regeneration methods cannot remove them, leading to costly sorbent replacement.
Innovation Solution
Regenerating sorbent particles in a carbon oxide-enriched environment, with a molar ratio of carbon oxide to oxygen greater than 0.01:1, to inhibit silicate formation by reducing sulfuric and sulfurous acid production, which promotes the conversion of metal oxide to silicate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidative regeneration methods are used, then the sorbent can be regenerated, but silicates form and occupy active sites, reducing desulfurization activity
Solution Approach 1:
The patent changes the chemical parameters of the regeneration atmosphere by controlling the molar ratio of carbon oxide to oxygen greater than 0.01:1. This parameter modification prevents silicate formation while maintaining effective regeneration of the sorbent, thereby resolving the contradiction between regenerating the sorbent and preventing harmful silicate formation.
Solution Approach 2:
Carbon oxide acts as an intermediary substance in the regeneration process. By introducing carbon oxide into the regeneration atmosphere, the patent mediates the interaction between oxygen and the sorbent, preventing direct formation of silicates while still enabling the oxidation of sulfur compounds. This intermediary approach allows regeneration without the harmful byproduct formation.
2Stability of the object's composition
If silicates are formed during regeneration, then the sorbent structure remains intact, but active sites are occupied and desulfurization activity is reduced
Solution Approach 1:
By modifying the atmospheric composition parameters during regeneration, specifically maintaining a carbon oxide to oxygen molar ratio greater than 0.01:1, the patent preserves the sorbent structure while preventing silicate formation that would occupy active sites and reduce desulfurization activity.
3Reliability
If the sorbent is replaced to maintain activity, then desulfurization performance is restored, but operating costs and lost production increase
Solution Approach 1:
The patent enables continuous regeneration of the sorbent without replacement by controlling the regeneration atmosphere to prevent silicate formation. This continuous action maintains desulfurization performance while eliminating the need for sorbent replacement, thereby avoiding lost production and reducing operating costs.
Solution Approach 2:
By changing the regeneration atmosphere parameters to include carbon oxide at a molar ratio greater than 0.01:1 with respect to oxygen, the patent extends the sorbent's operational life and maintains performance, avoiding the need for replacement and the associated productivity loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the silicate generation rate and concentration, maintaining sorbent activity and extending its lifespan by preventing the depletion of active desulfurization sites.
Implementation Method 1
regenerating at least a portion of the sulfur-laden sorbent particles in the regeneration zone under regeneration conditions... the total molar ratio of carbon oxide to oxygen in the one or more gas streams is greater than about 0.01:1
Data Source
AI summary
A method for regenerating desulfurization sorbents that minimizes the in situ formation of one or more silicates. It has been discovered that regenerating sulfur-laden sorbent particles in a carbon oxide-rich environment unexpectedly reduces the in situ silicate formation rate, as compared to similar sorbents regenerated using conventional methods.