Heatless desiccant compressed air dryer HLD series

Principle of Operation A heatless twin tower desiccant dryer opérâtes by removing moisture through adsorption onto a granular desiccant bed from the air supply. As compressed air flows up through a packed bed of desiccant in tower 1, water vapor is adsorbed. Meanwhile tower 2 is rapidly depressurized and dry purge air from the outlet of tower 1 isfed through a purge valve, expanded to near atmospheric pressure, and counter-flowed down through tower 2 to effect the régénération of its granular desiccant bed. When the desiccant in tower 1 becomes saturated with water vapor the air supply is switched back to tower 2 after it has been re-pressurized and the cycle continues. As default, ail HLD models above 5X are provided with the following options. Dew Point Stretch Cycle: It stretches the moisture loading time of the desiccant bed by increasing the drying time. A dew point meter at the outlet with a required dew point setting provides the signal for the stretch cycle. This reduces the purge air in accordance to the air flow and dew point chosen. The purge occurs for the pre-programmed time during this time. Note - Dew point meter not in dryer scope. Purge Optimizer: It reduces the percentage of régénération flow based on the front panel setting. It has 4 options 40%, 60%, 80% & 100% purge optimization cycles respectively. The settings correspond to flow or moisture load through the dryer. Separate LED IndicatorsforTower Status, Purge Optimizer & Condensate Drain