Agile Operation of Renewable Methanol Synthesis under Fluctuating Power Inputs

Christopher Varela*, Mahmoud Mostafa, Elvis Ahmetovic, Edwin Zondervan

*Corresponding author for this work

Research output: Contribution to journalConference articleAcademicpeer-review

Abstract

The fluctuating production of renewable energy constraints the operation of Power-to-X processes such that steady-state conditions are unattainable without energy storage. It seems eminent to establish operation strategies considering significant disturbances along the process and to determine those scenarios where the operation becomes unfeasible. In this work, an industrial methanol Lurgi-type reactor, embedded in a Power-to-Jet process (Figure 1), is evaluated under fluctuating feed conditions. The simulated scenarios consist of step functions up to 20 % (w/w) increments in the feed flowrate as consequence of the fluctuating power input on the electrolysis stage. A one-dimensional dynamic model for a multi-tubular fixed bed reactor is implemented, considering both the gas and catalyst phase. The mathematical model is solved numerically using orthogonal collocation at the spatial domain and backward differences at the time domain. The system shows rapid response to disturbances, reaching steady state conditions in 1.5 minutes. Furthermore, it is evidenced that the feasible region to increase the production of methanol is narrowed down by rises of carbon dioxide feed flowrate up to 5 % (w/w).

Original languageEnglish
Pages (from-to)1381-1386
Number of pages6
JournalComputer aided chemical engineering
Volume48
DOIs
Publication statusPublished - Jan 2020
Externally publishedYes
Event30th European Symposium on Computer Aided Process Engineering, ESCAPE 2020 - Milan, Italy
Duration: 24 May 202027 May 2020
Conference number: 30

Keywords

  • methanol synthesis
  • Power-to-X
  • process dynamics
  • renewable energy

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