|Type of Absorbent|
Size of Molecular Sieve
Heating Inlet Temperature
Heating Outlet Temperature
Cooling Outlet Temperature
Main Air Inlet Temperature
Max. Permissible Carbon dioxide in Atm. Air
Max. Moisture content
Allowable in Atm. Air relative humidity
Heater voltage supply
|Molecular Sieve Type|
1.5 mm partite
3 ½ hours
1 ½ hours
Min. 250 Deg.C. To Max. 300 Deg.C.
Min. 150 Deg.C. To Max. 170 Deg.C.
Min. 30 Deg.C. To Max. 50 Deg.C.
Min. 8 Deg.C. to Max. 20 Deg.C.
Min. 35 Kgs./cm2 to Max. 60 Kgs./cm2
50 % to 70 %
At 15 Deg.C.
Each vessel of the Molecular Battery is filled with Molecular Sieve of 1.5 mm. Type 13-X. As the process air passes through Molecular Sieve the Molecular Sieve will absorb water vapor and CO2 from the air. After some 10 hours, the Molecular Sieve becomes saturated, and it will have to be regenerated.
If hot air at low pressure is passed through the saturated Molecular Sieve, the Molecular Sieve will discharge the CO2 and water vapor and is ready for use again. The absorbing capacity of the Molecular Sieve drops rapidly if the process air is warm. Therefore, ensure that the compressed air entering into the Molecular Sieves below 15 Deg.C. And that the Molecular Sieve is thoroughly cooled after regeneration, before the process air is passed through it again.
The waste Nitrogen from the Cold Box is passed through an Electrical Heater and then passed through the vessel to be regenerated. The temperature at the inlet of the vessel rises rapidly, while the outlet temperature wills rise very slowly. If the outlet temperature reaches 170 Deg.C. (For about one hour) the Molecular Sieve is regenerated. This process is known as the heating cycle, which will take 2 /3 hours. At this stage, if the inlet temperature exceeds 300 Deg.C. The heater must be put off and put on again after 10 minutes. When the outlet put off, but the Cold Nitrogen will continue to pass through the vessel cooling the Molecular Sieve. This process is known as the cooling cycle which will last about 4 hours. After cooling, the vessel is ready for use when required for purifying the process air.
Oil vapor will destroy the Molecular Sieve and therefore ensure that the carbon filter is in good condition and the process air is as cool as possible, that maximum oil and moistures condenses out before the air enters the vessel.
While changing from one vessel to the other, pressurize the vessel very slowly, by opening the valve A-7 or A-8. It may take half a for the vessel to pressurize. If the main valves are opened rapidly, the Molecular Sieve may break up, due to high pressure air propelling the Molecular sieve in the vessel.