A low energy consumption de-carbonization natural gas combined cycle power generation system based on LiBr/H2O absorption heat transformer. (July 2021)

• Record Type: Journal Article
• Authors: Hu, Yue; Zhang, Luobin; Lv, Hui; Lu, Shijian; Xu, Gang; Xu, Cheng
• Is Part Of: International journal of greenhouse gas control. Volume 109(2021)
• Publication Date: 2021-07
• Subjects: NGCC -- CO2 capture -- AHT -- System integration -- Surplus heat utilization; 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.2021.103389
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: Absorption heat transformer is introduced to upgrade the waste heat from CO2 capture process. Energy flow characteristic of CO2 capture process is deeply analyzed. The inexistence of regenerative heaters in NGCC is considered in the new integrated system. Abstract: An integrated system of natural gas combined cycle (NGCC) with monoethanolamine-based (MEA-based) CO2 capture was proposed in this study aiming to reduce the efficiency penalty of CO2 mitigation. In the proposed system, three measures were adopted: (1) utilizing absorption heat transformer (AHT) and ejector to recover the waste heat as well as providing suitable steam for solvent regeneration; (2) recirculating part of reboiler condensate to fully utilize the superheat degree of the extracted steam, and (3) injecting reboiler condensate into the regenerative system of power cycle to reuse the surplus heat of reboiler condensate. Thermodynamic benefits and economic viability of the proposed system were compared with the de-carbonization NGCC power plant without integration. Results indicated the efficiency penalty of CO2 capture in the proposed system decreased by 2.67 percentage points. Meanwhile, the cost of electricity and the cost of CO2 avoided were reduced by 4.73% and 15.08%, respectively, while the adopted additional devices caused an increase of the investment by 19.12 M$.