Seeking help with PSA

What is the designed content of gaseous hydrogen in the analysis? What is the current level? The hydrogen recovery rate is achieved at the expense of purity; it is not possible to reduce the hydrogen content in the desorbed gas indefinitely. As long as the purity does not exceed the specified limit, the adsorption time can be increased.

Generally, the hydrogen content should be controlled; if the hydrogen content in the product is too low, it can cause problems with the adsorbent. The hydrogen content in the desorption gas is usually not taken into consideration.

We only adjust the purity of the product gas; by reducing the purity of the product gas, there may be less hydrogen in the analysis gas

Adjusting the hydrogen content in the desorbed gas is achieved by adjusting the purity and recovery rate of hydrogen; it is essential to ensure that the hydrogen purity meets the required standards. To reduce the content of hydrogen in the desorbed gas, adjustments can be made to the hydrogen recovery rate. However, to maintain purity, methods such as increasing the adsorption time, raising the operating coefficient, increasing the regeneration pressure, reducing the system pressure, and slightly raising the inlet temperature can be employed. The main factor that needs to be adjusted is the adsorption time

This post was last edited by Feidao on 2016-9-21 at 21:55. The adjustment of pressure swing adsorption involves both large-scale adjustments and fine-tuning. Large-scale adjustments refer mainly to the adsorption time (or cycle time), which is influenced by operating conditions such as pressure, flow rate, and impurity content. Under fixed operating conditions, this time remains relatively constant. Methods for reducing the hydrogen content in the desorbed gas have already been summarized by others. Next, we will focus on the aspects of fine tuning, which mainly include optimizing the desorption process and making precise adjustments to the valve parameters. For example, it is necessary to reduce the desorption pressure in the adsorption tower during desorption. The lower the desorption pressure, the higher the concentration of impurities released from the adsorbent; at the same time, more thorough desorption facilitates an increase in the cycle time. All these factors contribute to an increase in the impurity content in the desorbed gas, thereby reducing its hydrogen content. The specific operations include: reasonably allocating the amount of purge gas used in each purge, controlling the regulating valves to ensure a uniform purge rate, reducing the pressure inside the tower as much as possible during reverse operation, and properly adjusting various utility valves.

If all the programmable valves are functioning properly, it is generally necessary to adjust the adsorption time