Relevance of the work is determined by the need to protect the steam circuit of TPP units from the parking atmospheric corrosion at inactivity. The main aim of the study is to carry out the comparative analysis of air dehumidification options in TPP-steam circuit using silica gel, placing it in disposable containers, or using a fluidized bed. The methods used in the study: based on the tested methods of forecasting the performance of installations for air drying from water vapor by adsorbents the authors evaluated their applicability in the operating conditions in the steam circuit TPP units. The results: The paper considers the task of conserving TPP units by absorbents (silica gel, zeolites etc.) widely used when drying and separating gases and liquids at flue gas carbon dioxide removal. As it is noted when maintaining the required moister in closed volumes the drying occurs in static conditions. Silica gel is humidified at low speed which generally depends on its grain size. Moisture capacity of silica gel at fixed relative gas humidity changes insufficiently. The paper considers as well the variant of configuration of the unit for air drying in steam and water tract of TPP by the absorbent grains in fluidized bed where absorbent particle interact to each other and to inner parts of the device. In industrial absorption units such kind of device with continuous operation is often used. It is efficient when capturing target components from outgoing gas high flows. It was ascertained that in order to reduce from 98 to 20 % relative humidity of air filling the tank with a capacity of 10 m3 , one kilo of silica gel with a minimum of technical water capacity of 0,2 is required; it is 25 times less than the value recommended in the rules of technical operation. Similar results were obtained in the framework of the adsorption fluidized bed. The required weight of silica gel is 7...12 kilos for drying moist air at a flow rate corresponding to the adsorption industry. But this scheme is more difficult to be accommodated within the TPP units steam circuit.