Carbon molecular sieve filling needs to be analyzed and planned according to the

technical documents and process requirements of the demand side, and specific

replacement filling plans and related precautions should formulate.

The general process of carbon molecular sieve filling is as follows:

1、 Before replacing the carbon molecular sieve, a comprehensive maintenance and

inspection of the equipment should carry out.

All valve components and pipelines need to be inspected.

2. Equipment inspection

2.1 Instrument inspection

Check all pressure display PI and temperature display TI instruments; Adjust the

threshold value of pressure switch and differential pressure switch, as well as the

threshold value of tool temperature interlock;

Check the limit switches, limit points and electrical contact points of all valves related

to the molecular sieve adsorbent.

Check if all two valves are working reliably, and if necessary, adjust the cylinder.

Check if the direction of all automatic valve components is correct.

2.2 Inspection of Automatic Control System for Pr-Purifier

Check the configuration of the automatic control program;

Step by step check the direction of the solenoid valve used for pr-purifier valve

control according to the program (check the electromagnetic polarity related to the

valve);

Check if all action signals from the site have been connected to the automatic control

system: Stepping conditions caused by pressure switches, differential pressure

switches, and temperature thresholds value,

Confirm the valve switch position determined by the limit switch; Adjust the timer.

2.3 Adjusting the control circuit:

Regenerated air flow into the heater flow circuit; Regenerative airflow cold box outlet

pressure.

2.4 Operation of regeneration heater

Check the combination and transformation of each heating unit: fixed power –

variable power; Adjust the control of heating temperature and adjust the safety

temperature control threshold; Check the tripping conditions of the electric heater

3. Replace the carbon molecular sieve step.

3.1. Calculate the specific filling quantity, then prepare the required materials and

tools, based on the volume of the adsorption tower.

3.2. Before opening the flange cover of the adsorption tower, make corresponding

marks, and during installation, ensure that it is properly seated, especially the

connection between the pipeline and the front control components.

3.3. After opening the flange cover, pay attention to the intact condition of the

original equipment’s filter pad, baffle, and filter screen. If any damage, it

should be replaced and treated in a timely manner.

3.4. Release and clean off the used carbon molecular sieve inside the adsorption tower,

and check the condition of the filter screen on the baffle at the bottom of the

adsorption tower. To prevent accidents, 3-4 layers of stainless steel wire mesh should

lay on top of the baffle, and the size of the mesh should be based on the diameter

of the adsorption tower.