Hydrogen compressor

"When the exhaust gas volume is large, two hydrogen compressors need to be opened, causing the front pressure to increase." I don't understand what it means.

Haha, it should be because the exhaust gas volume is large, causing the pressure to be high, so two hydrogen compressors need to be opened. Or, if two hydrogen compressors are opened, the pressure behind them is high? ? ?

The exhaust gas is mainly hydrogen, so a hydrogen compressor is used； When the exhaust gas volume is large, two hydrogen compressors need to be opened. I don’t know how your craftsmanship is? Nowadays, much of the hydrogen recovered from the tail gas is processed and returned directly to the reduction furnace to participate in the reaction (the purity of the hydrogen recovered from the tail gas is very high).

The main reason is that the volume cannot reach the processing capacity of the two compressors in normal operation, resulting in a large amount of gas entering the front end of the compressor through the secondary return and first pipelines to supplement the compressor intake to meet the inlet pressure. This is what the poster said, and my understanding of the so-called increase in front pressure is because there is a problem with the layout of the secondary return and primary pipelines. After all, when a large amount of gas returns to the front end of the compressor, it affects the exhaust gas of the reduction furnace or hydrogenation furnace, and is overpressured, causing the front pressure to increase. You can stop a compressor and try it, or adjust the compressor inlet pressure slightly downward.

It should be that the intake volume of the exhaust gas was not well controlled at the beginning, resulting in a large amount of backflow.

I don’t understand what it means. How can turning on the hydrogen compressor cause the pressure in front to increase?

The 5th floor said it well. This can only be said by those who have done it on site and thought about it. I believe he is right.

In order to keep the compressor inlet pressure relatively constant and not affect the reduced exhaust gas, the hydrogen compressor has a return pipe, and the return flow should be chained according to the inlet pressure of the hydrogen compressor. Generally, a regulating valve is used to realize automatic control on the DCS. If the backflow volume decreases and is close to 0, it is necessary to consider turning on the backup machine. At the same time, a certain amount of backflow will occur when the backup machine is turned on. In addition, there is another way, which is to realize frequency conversion control of the hydrogen compressor and adjust the work of the hydrogen compressor according to the inlet pressure. In this way, the control is stable and energy can be saved. The outlet pressure of the hydrogen compressor is adjusted on the subsequent device according to process needs, and is generally not adjusted on the compressor.