Details

Autor(en) / Beteiligte

• Diego, M.E.
• Arias, B.

Titel

Impact of load changes on the carbonator reactor of a 1.7 MWth calcium looping pilot plant

Ist Teil von

• Fuel processing technology, 2020-04, Vol.200, p.106307, Article 106307

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This work analyses the performance of a Calcium Looping (CaL) carbonator reactor that captures CO2 from a power plant operating under large load changes. Several experimental campaigns have been conducted in La Pereda 1.7 MWth CaL pilot plant where the carbonator inlet flue gas velocity varied between 2.0 and 5.3 m/s, leading to large changes in the particles entrainment rate and the solids inventory. These tests showed that CaL systems using circulating fluidized bed reactors are highly flexible. Modest gas velocities translate into high CO2 capture efficiencies because circulation rates equivalent to CaO/CO2 molar ratios ~10–12 can still be maintained, while carbonator solids inventories are relatively large. Under high carbonator gas velocities, a sorbent with high CO2 carrying capacity is necessary to guarantee high CO2 capture efficiencies. In these conditions, the recirculation of a fraction of the exiting particles towards the bottom of the carbonator proved to be useful for moderating the solids circulation rate between reactors, increasing the particles residence time in the carbonator and sustaining high CO2 capture efficiencies. For load increases, staging the flue gas entering the carbonator helped to sustain high CO2 capture efficiencies thanks to maintaining the solids inventory at the bottom of the reactor. •The carbonator performance is tested in a large CaL pilot plant when load changes.•The results obtained indicate CaL dual CFB systems can be highly flexible.•Flue gas staging was tested as a tool to increase the flexibility of CaL systems.