Method for reducing molecular sieve pulverization
1. Reasonably design the gas inlet and gas distributor of the adsorption tower to distribute the gas evenly, let the compressed air diffuse quickly after entering the adsorption tower, reduce the gas flow rate and reduce the impact on the carbon molecular sieve. If the gas distribution is poor, the compressed air will affect the local carbon The impact of the molecular sieve is too large, and the impact over the years can easily cause the powdering of the molecular sieve. At the time of pressure equalization, the molecular sieve at the top and bottom of the adsorption tower is subject to instantaneous impact. Therefore, it is necessary to redesign the design of the gas distribution end distributor of the adsorption tower to reduce the impact of the carbon molecular sieve on the top carbon molecular sieve during pressure equalization.
2. When filling the carbon molecular sieve, every 30 to 40 cm of filling should be tamped to eliminate the excessive gap formed by the natural pouring of the carbon molecular sieve into the carbon molecular sieve, to prevent the bed layer from appearing "overlap" and the gap is too large. It is strictly forbidden to fill the adsorption tower at one time, and then vibrate the adsorption tower again. This is difficult to ensure that the bed is dense. The adsorption tower scours back and forth when the inlet of the adsorption tower. .
3. The pressure equalization is extended. The pressure equalization in the traditional process is too fast. Generally, the pressure equalization ends at 1 to 2 seconds. The adsorption pressure of domestic nitrogen making equipment is generally ≥7 bar. When the pressure equalization ends, the pressure of the adsorption tower rises rapidly by 3.5 bar. If the impact is too large, it is recommended to extend the pressure equalization time to 4-6 seconds by limiting the flow of the pressure equalization pipe.
2. When filling the carbon molecular sieve, every 30 to 40 cm of filling should be tamped to eliminate the excessive gap formed by the natural pouring of the carbon molecular sieve into the carbon molecular sieve, to prevent the bed layer from appearing "overlap" and the gap is too large. It is strictly forbidden to fill the adsorption tower at one time, and then vibrate the adsorption tower again. This is difficult to ensure that the bed is dense. The adsorption tower scours back and forth when the inlet of the adsorption tower. .
3. The pressure equalization is extended. The pressure equalization in the traditional process is too fast. Generally, the pressure equalization ends at 1 to 2 seconds. The adsorption pressure of domestic nitrogen making equipment is generally ≥7 bar. When the pressure equalization ends, the pressure of the adsorption tower rises rapidly by 3.5 bar. If the impact is too large, it is recommended to extend the pressure equalization time to 4-6 seconds by limiting the flow of the pressure equalization pipe.