Technology

A generic Water Gas Shit technology (WGS) is provided whenever the technology needs to be modeled in a facility and technology provider is not known.

 The water gas shift (WGS) reaction converts carbon monoxide in syngas by rreacting it with water vapor into carbon dioxide and hydrogen according to the equilibrium equation:

The WGS unit is modeled according to: 

• To produce the stoichiometric reaction, the inlet syngas, and steam enter the first shift reactor at a separate flow rate.
• After exchanging heat with HX-1, the product stream produced PRD1-A.
• The PRDI-A enters the reactor for the second shift.
• Water and carbon monoxide reacted in the second shift reactor (PRD2) to produce carbon dioxide and hydrogen.
• Heat was transferred from the PRD2 to the HX-2, creating PRD2-A.
• The flash separator receives the effluent gas PRD2-A.
• The flash separator's top product enters HX-3A before going into the carbon dioxide separator (CO2ABS).
• As depicted in the WGS flowsheet, the carbon dioxide separator is a 15-stage equilibrium reactor that absorbs CO₂.

Water gas shift flowsheet ^[2]

Reference

1. Janbarari S. R., Taheri Najafabadi, A.. Simulation and optimization of water gas shift process in ammonia plant: Maximizing CO conversion and controlling methanol byproduct. International Journal of Hydrogen Energy, 48(64), 25158–25170. DOI: 10.1016/j.ijhydene.2022.12.355
2. Olanrewaju F., Oboh I., Adesina O., Anyanwu C. & Ewim, D. Modelling and simulation of hydrogen production plant for minimum carbon dioxide emission (Feb 15, 2023). The Journal of Engineering and Exact Sciences, 9(1), 15394. DOI: 10.18540/jcecvl9iss1pp15394-01e