(514g) CO2 Utilization through Power-to-Methanol with High Temperature Heat Pump

Carbon Capture Utilization (CCU) provides an attractive opportunity to create value for decarbonization of industrial sectors. The utilization of CO₂ through a power-to-methanol with CO₂ from Direct Air Capture is studied in this work. The CO₂ from Direct Air Capture (DAC) is paired with electrolytic hydrogen powered by renewable electricity to produce synthesize liquid hydrocarbons (e-fuels). DAC is recognized as a crucial technology for atmospheric CO₂removal. DAC is unique among negative-emission technologies as it captures CO₂ from air and mixtures of air and CO₂-rich industrial emission sources independent of origin and location.

A Low temperature (LT) solid sorbent DAC is selected in this work where adsorption and desorption (regeneration) of CO₂ occur one after another a single unit with a solid sorbent.

An industrial high temperature heat pump (HTHP) is investigated in the present study to provide the required thermal energy to DAC and methanol production using low temperature waste heat from various industrial sources (e.g., ethylene furnaces, steam condensate, cooling water from furnace doors, annealing furnaces, air compressors, hot process liquids or solids) and atmospheric air.

ASPEN Plus and Engineering Equation Solver (EES) software are used to model the energy and exergy requirements for the entire system. Early results indicate attractive energy and exergy efficiency of power-to-DAC-to-methanol. The energy and exergy efficiency of the system are calculated based on operation parameters of each subsystem considering various sources of industrial waste heat. Various working fluids with low ozone depletion and global warming potentials, are also investigated for the heat pump.