Molecular sieve activation national standard

Its activation procedure is as follows: for reference only – Special regeneration scheme for adsorbents. 1. Purpose of special regeneration: After the adsorbents are filled, they should be subjected to high-temperature regeneration in order to remove the water and carbon dioxide absorbed during transportation and filling. The outcome of this process is an improvement in the adsorption efficiency of the molecular sieves, which is of great importance for safe, stable, and long-term operation. II. Preparation for special regeneration: 1. Check whether the air compressor system is functioning properly ； 2. Check whether the air pre-cooling system is operating properly ； 3. Check whether the steam heater and electric heater are functioning properly ； 4. Check whether the water, electricity, steam, and instrument control systems are ready for operation ； 5. All valves should be in the closed position. III. Steps for special regeneration: Start air compressor C01 according to the operating procedures. Start the pre-cooling system: (1) Slowly pressurize the air-cooled tower using the air compressor supply valve HV7101; once PIAS-7102 reaches 0.4 MPa (G), start the cooling water pump as soon as possible, with the cooling water flow rate (FICA-7101) to be kept at ≤375 t/h. (2) After the cooling water pump has been adjusted to proper operation, open valves V7113 and V7114 in sequence. Use valve V7114 to regulate the air volume entering the water cooling tower. Then start the chilled water pump and the chiller. Before starting the chilled water pump, open valve LCV-7103 first. Once the water level indicated by LICA-7103 reaches the set value, LCV-7103 will operate in automatic mode, and the flow rate of chilled water (FICA-7102) should be kept at ≤80 t/h. (3) After the level of LICA-7105 reaches ≥200 mm, open V7157 and LCV7105 appropriately. Once the level of LICA-7105 reaches the set value, LCV7105 switches to automatic mode, and the amount of water returned from the middle section of the air-cooled tower to the cooling tower is controlled by valve V7157. (4) Operating condition adjustment ① Adjustment of the air temperature at the exit of the air-cooled tower: The exit temperature of the air-cooled tower should be kept below 8°C; in particular, TIA-7104 should be maintained below 6°C while FICA-7102 should remain around 80 T/h. When the temperature is too high, it is necessary to increase the load on the water-cooled tower and the chiller in order to reduce the air temperature at the exit of the air-cooled tower. ② Regulation of the water flow rate into the air-cooling tower: The water flow rate entering the air-cooling tower should change in accordance with the amount of air being processed. The circulating water is primarily regulated through valve FCV7101, while the chilled water is mainly regulated through valve FCV7102. Special regeneration of molecular sieves: Once the air pre-cooling system is operating properly and the adsorbent has been filled in as required, special regeneration is carried out; one unit is regenerated after another. The detailed steps are as follows: (1) After the instrument control system has been tuned and verified to be working properly, conduct joint testing of the instrument control system and the switching system; it is best to carry out the testing of the switching system before filling the adsorber with molecular sieve ； (2) Before commissioning, check whether the wiring of solenoid valves, pneumatic selector valves, and the instrument control system is correct; also verify individually that the pneumatic selector valves operate smoothly and that the limit switches are in place. After the above tasks are completed, supply instrument air to the switching system; the required pressure for this air is 0.4–0.6 MPa, with a dew point of -40°C. The switching system should operate without load for 16 hours, during which its operation as well as the functioning of the valves must be checked to ensure they operate accurately, reliably, and flexibly. Any issues that arise should be addressed promptly. (3) High-temperature regeneration ① Start-up. Before starting, thoroughly check whether the equipment is in good condition and whether all valves are in the closed position. Open HV7203 or HV7204 to slowly pressurize the purifier. Slowly open valves V7216, V7218, and V7219 on the steam pipeline, as well as the condensate discharge valve V7220 (i.e., activate the steam heater). Contact the dispatch team to prepare for delivering the condensed liquid. Open the inlet and outlet valves V7214, V7215 of the electric heater ； Open valves V7216, V7218, V7219 ； Then open valves V7226 and V7225 in sequence to keep the pressure of PI-7205 at no more than 15 kPa. Activate the control system; a reduced amount of compressed air is sent to the purifier, with the volume of air entering the purifier being sufficient for its regeneration process. The bed pressure is maintained above 0.48 MPa, while the pressure and flow rate of the regeneration gas are regulated by V7225. Once the flow rate of the gas to be regenerated (FIC7201) reaches 8000 Nm3/h or more, start the electric heater. The outlet temperature of the electric heater is adjusted using a power regulator; the required temperature is around 260°C, while the regeneration flow rate should be around 16,000 Nm3/h. The pressurization and depressurization of the adsorber should be carried out smoothly, which is achieved by adjusting the opening times of HV7203, HV7204, as well as HV7211 and HV7212. Once adjusted, these opening times should remain unchanged. High-temperature regeneration requires a purifier temperature of ~180°C, whereas cold blowing requires ambient temperature. ② During regeneration, the heating time for each purifier is ~20 hours, and the cooling time is ~4 hours; each purifier is regenerated once. The time control for high-temperature regeneration is achieved through program delay. ③ After the adsorbents in both adsorbers have been regenerated in sequence, the air compressor has its load reduced, and all valves of the two adsorbers are closed simultaneously. ④ Stop the air pre-cooling system. ⑤ Shut down the air compressor and turbine according to the procedures, and carry out the post-shutdown tasks. IV. Precautions: 1. During special regeneration periods, it is necessary to ensure the supply of water, electricity, and steam in order to maintain the proper operation of the air compressor and the air pre-cooling system. 2. The supply of cooled air to the water-cooled tower, the supply of heated air to the adsorbers, and the switching of adsorbers should all be carried out slowly to ensure that the pressure at the outlet of the air compressor remains above 0.45 MPa. 3. The electric heater can be activated only when the flow rate of the heated air exceeds 8000 Nm3/h. The flow rate of the heated air must meet the required specifications, and the temperature of the air exiting the adsorber must also reach the set criteria, in order to ensure the quality of the regeneration process. 4. Pay close attention to AIA-7203 to prevent leaks in the steam heater E-7001. 5. After regeneration is complete, all inlet and outlet valves of the adsorbers V7001A/B should be closed immediately to prevent wet air from entering and reduce the adsorption efficiency of the adsorbent.

I don’t know who came to the wrong place!

Generally, temperature is used as the indicator for evaluation

4# The gentle breeze invites the moon – what temperature is suitable then? Mao Fu furnace – will that work?

Recommended method for activating molecular sieves for experiments: Main equipment: muffle furnace, glass vacuum dryer. Load the molecular sieve into a high-temperature ceramic container, place it in a muffle furnace, and raise the temperature to 400 degrees. Once the desired temperature is reached, leave it in the furnace for one hour. Then, use stainless steel tongs to remove the container and place it in a glass vacuum dryer to cool down to room temperature. Once activation is complete, testing can be carried out. The activation temperature for silicone is 120 degrees for one hour. (It can be dried using a constant-temperature oven, and cooling is also carried out in the same manner.)

6# maogenfu Thank you for the help~3Q