Method for cleaning metallic or non-metallic surfaces of e.g. turbine blade in steam turbine, involves loading flow of compressed air with carbon dioxide pellets, hardened pellets, water ice particles and fragmented pellets

摘要

The method involves drying a hot, dry volume flow of compressed air with carbon dioxide (CO2) pellets (16) and with a fine-grained, solid abrasive (12) or the compressed air in stages to dew point of -60 degree Celsius. The hot, dry volume flow of compressed air is heated in the stages to +90 degree Celsius. The flow of compressed air is loaded with the CO2 pellets, hardened CO2 pellets, water ice particles or CO2 pellets with one-sided water ice, fragmented CO2 pellets with a closed water ice mantle, CO2-particles with one-sided or closed water ice mantle. An independent claim is also included for a device for executing a method for cleaning metallic or non-metallic surfaces by using compressed air.