The inertial impaction technique is applied extensively for particulate matter classification and understanding the characteristics of inertial impactors is important for designing a good classifier. This article reviewed and synthesized the knowledge of the design and improvement of inertial impactors for long-term use without frequent maintenance needs. The applications of the inertial impactors for personal exposure measurement, particulate matter control and potential power classification at very high concentrations with the cutoff diameter down to submicron even nanometer sizes were addressed.
Increasing renewable energy storage and boosting CO2 capture systems are considered two key routes within the near-future energy scenario. The calcium looping (CaL) process, based on limestone as (cheap) raw material, is a flexible technology that can operate under both routes simply by modifying its operation conditions, namely, reactor gas composition, temperature, pressure, and particle size. As a post-combustion CO2 capture system, the CaL process (TRL7) could capture CO2 on a large scale with an energy consumption lower than 3MJ/kg CO2. As a thermochemical energy storage system (TRL 5), thermal-to-electric efficiencies above 45% could be reached in fully dispatchable renewable plants.