A technology review for regeneration of sulfur rich amine systems. (August 2018)

• Record Type: Journal Article
• Authors: Garg, Bharti; Verheyen, T. Vincent; Pearson, Pauline; Feron, Paul; Cousins, Ashleigh
• Is Part Of: International journal of greenhouse gas control. Volume 75(2018)
• Page Start: 243
• Page End: 253
• Publication Date: 2018-08
• Subjects: CO2 capture -- Flue gas desulfurisation -- Amine regeneration -- Sulfate; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2018.05.019
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: Discusses the established and novel simultaneous CO2 and SO2 capture technologies. Assesses the various amine regeneration technologies. Theoretically evaluates the suitability of various regeneration technologies to sulfur loaded CS-Cap absorbent. Preliminary cost comparison of reclaiming technologies for CS-Cap Concept. Identifies the research gaps for cost comparison between standard CO2 capture with FGD and the CS-Cap concept. Abstract: Reducing the capital cost of post combustion CO2 capture by eliminating flue gas desulfurisation (FGD) pre-treatment, requires management of the amines preferential SO2 absorption. Novel technologies such as CS-Cap restrict the impact of SO2 to only a small fraction of the amine inventory resulting in high sulfate burden amines. Traditional thermal reclamation of these spent absorbents has advantages regarding simplicity, but ranks poorly for industrial ecology around PCC. These amines require low energy regeneration technologies compatible with their physico-chemical properties that also maximise the potential for valorising by-products. This review summarises the sulfur chemistry and outlines several amine reclamation processes. It assesses the status of established and novel regeneration technologies for their applicability to high sulfur loaded amines. Should deep sulfur removal be required, a hybrid approach with initial bulk removal (as product) followed by a polishing step to further reduce sulfur is prospective. A preliminary estimation of the relative cost of using standard reclamation methods for treating Sulfur loaded CS-Cap absorbent revealed the cost would increase due to its higher sulfate burden despite comparable treatment volumes. Research gaps are identified which would enable better comparison between the costs of traditional FGD versus higher reclamation costs for combined capture technologies.