Gas capture system with combined temperature and pressure swings using moving adsorbent

A gas capture system comprising:

• a first reactor system arranged so that, in the first reactor system, at least some gas in a gas stream that is received by the gas capture system is captured by a sorbent that is arranged to flow through the first reactor system, wherein a sorbent inlet of the first reactor system is located above a sorbent outlet of the first reactor system such that the direction of sorbent flow through the first reactor system is vertically downwards;
• a second reactor system arranged to regenerate the sorbent so that the sorbent releases at least some of the gas captured in the first reactor system, wherein the sorbent is arranged to flow through the second reactor system and the second reactor system is arranged to output a flow of the released gas, wherein a sorbent inlet of the second reactor system is located below a sorbent outlet of the second reactor system such that the direction of sorbent flow through the second reactor system is vertically upwards;
• a first sorbent transfer system arranged between the sorbent outlet of the first reactor system and the sorbent inlet of the second reactor system, wherein the first sorbent transfer system comprises a lock hopper;
• a second sorbent transfer system arranged between the sorbent outlet of the second reactor system and the sorbent inlet of the first reactor system, wherein the second sorbent transfer system comprises a lock hopper;
• and
• a heat pump system arranged to transfer heat between the first reactor system and the second reactor system
• wherein:
• the sorbent is a solid;
• the second reactor system comprises a pump configured to reduce the pressure in the second reactor system so that the second reactor system has a lower operational pressure when regenerating sorbent than the operational pressure of the first reactor system during gas capture by the sorbent, wherein the pump is arranged to extract gas through a gas extraction outlet of the second reactor system and the gas extraction outlet is located such that there is a gas flow vertically upwards from the sorbent inlet end of the second reactor system;
• the first reactor system, first sorbent transfer system, second reactor system and second sorbent transfer system are all arranged so that they provide a sorbent flow path that recirculates the sorbent vertically downwards through the first reactor system, through the first sorbent transfer system, vertically upwards through the second reactor system, and through the second sorbent transfer system;
• and
• the second reactor system is arranged to regenerate the sorbent by heating the sorbent with heat received from at least the heat pump system.