Overview of HL series heatless regenerative dryers. WWW.VANAIRSYSTEMS.COM
Billbert www.vanairsystems.com
Regenerative Desiccant Dryers MHL/HLS Series Heatless HL Series Heatless HI Series-Heated Internally HB Series Heated Blower HP Series Heated Purge www.vanairsystems.com
HL Heatless Regenerative Dryers Desiccant Absorbent Twin Tower Pressure Swing Regens Thermal Swing Heatless Heaterless (most accurate term) www.vanairsystems.com
Basic Design Components Two Towers Filled with Adsorbent Desiccant Activated alumina is most common www.vanairsystems.com
Difference between two types of Desiccant They are not interchangeable!!! www.vanairsystems.com
Difference between two types of Desiccant BIG DINKY DIMINUTIVE www.vanairsystems.com
Desiccant Bed Operation Fresh Bed Dry Air Out Wet Air Boundary Saturated Wet Air In www.vanairsystems.com
Dry air out Break Through Point ~0% humidity Mass Transfer Zone 100% humidity Wet air In
Depressurized Drying Purge Air.0521 grains -40F/C dew point 100F inlet temperature 0 PSIG 100 PSIG 19.97 grains -.0521 grains 19.918 grains This is 99.97% removal 19.97 grains Where does it go? www.vanairsystems.com
0 PSIG Purge Air 0 PSIG 100 PSIG Purge air Air out of the dryer Air into the dryer
Drying Regenerating Regenerative Drying Cycles 100 PSIG 0 PSIG www.vanairsystems.com
Drying Repressurization Regenerative Drying Cycles 100 PSIG 0-100 PSIG www.vanairsystems.com
Drying Repressurized Regenerative Drying Cycles 100 PSIG 100 PSIG www.vanairsystems.com
Depressurized Drying Regenerative Drying Cycles 0 PSIG 100 PSIG www.vanairsystems.com
V V Heatless Regenerative Dryer Outlet Purge orifice or valve V ) ( V 0 PSIG 100 PSIG Open purge valve Closed purge valve o Inlet x
V V Heatless Regenerative Dryer Outlet Purge orifice or valve V ) ( V Increasing pressure 100 PSIG Closed purge valve Closed purge valve x Inlet x
V V Heatless Regenerative Dryer Outlet Purge orifice or valve V ) ( V Equal pressure 100 PSIG 100 PSIG Closed purge valve Closed purge valve x Inlet x
V V Heatless Regenerative Dryer Outlet Purge orifice or valve V ) ( V Equal pressure 100 PSIG 100 PSIG Closed purge valve Closed purge valve x Inlet x
V V Heatless Regenerative Dryer Outlet Purge orifice or valve V ) ( V Equal pressure 100 PSIG 0 PSIG Closed purge valve Open purge valve x Inlet o
Interlock Logic System CONTROL AIR PROCESS AIR (100 PSIG) 0 PSIG VAN AIR 3-WAY SHUTTLE VALVE
CONTROL AIR PROCESS AIR 100 PSIG 0 PSIG VAN AIR 3-WAY SHUTTLE VALVE
CONTROL AIR 100 PSIG 100 PSIG VAN AIR 3-WAY SHUTTLE VALVE
CONTROL AIR CONTROL AIR PROCESS AIR 0 PSIG (100 PSIG) 0 PSIG Process Air 100 PSIG VAN AIR 3-WAY SHUTTLE VALVE VAN AIR 3-WAY SHUTTLE VALVE
Follower
Follower
Pneumatic limit switches
Pneumatic limit switches Valve Position Indicator
Standard control panel
Cycle Hold Standard control panel Failure to switch Pressure Switches
EMCON II control panel
EMCON II Microprocessor Hygrometers Moisture sensors
Desiccant Capacity % Refrigerated Dryer Ahead of Heatless Dryers 45 40 35 30 25 20 15 10 5 Desiccant Capacity vs. RH 0 0 20 40 60 80 100 Relative Humidity
Instrument Air Quality Standard Taken from ISA S7.3 4.1 Dew Point, (at line pressure) 4.1.1 Outdoor installations (where any part of the instrument air system is exposed to the outdoor atmosphere). The dewpoint at line pressure shall be at least 10 C (18 F) below the minimum temperature to which any part of the instrument air system is exposed at any season of the year. In no case should dew point at line pressure exceed 2 C (approximately 35 F) www.vanairsystems.com
Instrument Air Quality Standard ISA S7.3 (continued) 3.2 Dew Point, (at line pressure) (for the purpose of this Standard) The dew point of the air at line pressure of the compressed air system (usually measured at the outlet of the dryer system, or at any instrument air supply source, prior to pressure reduction). When presenting or referencing dew point, the value shall be given in terms of the line pressure; e.g., (our emphasis) -40C (-40 F) dew point at 100 psig. This is an example. The other section is the actual requirement
Anti-Flood System Receiver/anti flood tank 1000 SCFM 85F ambient 70% ambient RH = 176 gallons/day Liquid Level Alarm An aftercooler removes 2/3 of the condensed moisture, Or 117 gallons of water per day. When the separator drain fails, It floods the dryer and downstream equipment. Automatic Drain
Double Block and Bleed Open to atmosphere You can also close this valve and use a gauge. Dryer or Filter
The most common service problem is. Death by Drowning. A regenerative dryer can only remove moisture vapor (not liquid water). www.vanairsystems.com
Desiccant Bed Contamination Precondition your compressed air www.vanairsystems.com
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