Pilot-scale evaluation of AMP/PZ to capture CO₂ from flue gas of an Australian brown coal-fired power station

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• 作者：Yuli Artanto ; James Jansen ; Pauline Pearson ; Graeme Puxty ; Aaron Cottrell ; Erik Meuleman ; Paul Feron
• 关键词：PCC pilot plant ; MEA ; AMP/PZ ; CO2-lean loading ; CO2 recovery ; Reboiler heat duty
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：January, 2014
• 年：2014
• 卷：20
• 期：Complete
• 页码：189-195
• 全文大小：750 K

文摘

Monoethanolamine (MEA) is a well-established absorption liquid used in post-combustion capture (PCC) technology that has a high rate of reaction with CO₂. However, an absorption liquid with improved properties, such as less degradation, less corrosion and a lower energy requirement for solvent regeneration, would greatly benefit the PCC process. An alternative to MEA is an aqueous solution of 2-amino-2-methyl-1-propanol (AMP), promoted with piperazine (PZ). This absorption liquid is expected to improve CO₂ recovery and reduce reboiler heat duty for solvent regeneration in PCC plants.

This paper evaluates the pilot-scale performance of an aqueous mixture of 25 wt% AMP and 5 wt% PZ (AMP/PZ) with a total amine concentration of 30 wt% compared with the baseline performance of aqueous MEA (30 wt%). We evaluated the reboiler heat required for solvent regeneration and CO₂ recovery for AMP/PZ and MEA as both a function of CO₂-lean loading at a similar liquid to gas (L/G) ratio, and as a function of L/G ratio at a similar CO₂-lean loading.

Our results show that AMP/PZ is a promising alternative to MEA. At a similar L/G ratio, both MEA and AMP/PZ required lower reboiler heat duty when CO₂-lean loading was reduced. At higher CO₂-lean loadings, neither absorption liquid showed any changes in reboiler heat duty as a function of L/G ratio. One exception occurred for AMP/PZ at lower CO₂-lean loadings (0.03 and 0.08 mol CO₂/mol amine), when reboiler heat duty dropped as the L/G ratio rose. In most experiments with AMP/PZ, the condenser heat and sensible heat were the major contributors to the reboiler heat duty at lower CO₂-lean loadings (<0.1 mol CO₂/mol amine). For MEA, the condenser heat had the highest portion in the reboiler heat duty at a CO₂-lean loading of <0.18 mol CO₂/mol amine. Increasing condenser heat was associated with an increase of heat for water evaporation to generate steam for CO₂ stripping. The reboiler heat duty to capture 鈭?0% and 鈭?5% CO₂ was similar for both absorption liquids; yet, to capture this proportion of CO₂, AMP/PZ required a higher L/G ratio than MEA.