Chlor-alkali hydrogen is being transported under pressure; the hydrogen delivery volume does not match the theoretical value. What’s going on?
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Our company is a chlor-alkali plant; hydrogen is compressed to 80 KPa using hydrogen compressors. Recently, an additional hydrogen compressor was installed to raise the pressure from 80 KPa to 2.2 MPa before the hydrogen is sent out. There are three flow meters on the output pipeline (one pipeline in total): two mass flow meters and one orifice flow meter. The readings from all three flow meters are around 1500 NM3. However, based on the theoretical value calculated from the current level of the electrolyzers, it should be 2800 NM3. After deducting the amount used by the synthesis furnace (300 NM3) and the amount vented (300 NM3 – the vent valve is a DN100 control valve with a pressure of 80 KPa, and its opening degree is roughly between 15% and 20%), there should still be 2100 NM3 of hydrogen available. Yet, the actual amount transported is only 1500 NM3 (all three flow meters show 1500 NM3). Leaks have been ruled out, and no other cause can be identified. Is there anyone who can analyze this for me?
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Due to the low density of hydrogen, calculations are rather complicated; the accuracy requirements for the instruments used must be high. Generally, instruments suffer from significant errors because hydrogen contains supersaturated water. That’s normal; P
3 flow meters, and moreover, during the hydrogen compression process, there are many instances of cooling and condensation. The water content in the hydrogen gas exiting the device is already very low
3 flow meters, and moreover, during the hydrogen compression process, there are many instances of cooling and condensation. The water content in the hydrogen gas exiting the device is already very low
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