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Formic acid synthesis and utilization for solar energy storage through solar‐driven chloralkali process and fuel cells
Author(s) -
Mardini Nour,
Bicer Yusuf
Publication year - 2021
Publication title -
energy storage
Language(s) - English
Resource type - Journals
ISSN - 2578-4862
DOI - 10.1002/est2.235
Subject(s) - formic acid , process integration , process engineering , solar energy , photovoltaic system , chemistry , energy storage , renewable energy , waste management , chemical engineering , engineering , organic chemistry , power (physics) , thermodynamics , electrical engineering , physics
The objective of this work is to propose an integrated system for formic acid synthesis via photovoltaic (PV) assisted‐chloralkali process and clean power generation by the fuel cell. The initial step is to develop process flow diagrams and to apply heat integration techniques to conserve energy in the synthesis of formic acid and direct formic acid fuel cell (DFAFC). The proposed system forms formic acid from gaseous H 2 produced from chloralkali unit and captured CO 2 . The electricity requirements of both PV‐assisted chloralkali and compression stages are supplied from the PV units. The results imply that the chloralkali process necessitates about 7.22 MW power to produce hydrogen at 25°C and 1 bar with an energy efficiency of 84%. H 2 and CO 2 gases are compressed to 60 bars with a total energy requirement of 951 kW. In the heat integration part, different scenarios are developed to determine the minimum heating and cooling requirements for maximum heat recovery. The results of such heat integration were achieved to conserve the energy in the formic acid process with total hot and cold utilities of 599 kW and 1884 kW, respectively.