The methanol cracking hydrogen production plant (PSA adsorption) has a high capacity, but the daily hydrogen demand is low – how should it be operated?
Thread Content
For example, in a unit with a capacity of 1000 NM3/h, if only 8000 NM3 of hydrogen is used per day, can it operate at a low load (30%) throughout the 24 hours? If it’s feasible, will raw material and energy consumption also decrease in proportion at low load levels? ? 2. Can it operate normally during the day shift? And when no gas is produced during the night shift but the system remains running, can hydrogen production be ensured starting from the next workday? ?
It generally needs to run continuously; it cannot be stopped intermittently
This post was last edited by syswwq on 2019-10-21 at 11:24. 1. It can operate for long periods under light load, but power consumption is definitely high. 2. Frequent shutdowns are not conducive to the safe operation of the system, as the risk level is too high
It is recommended to consult with the PSA technology provider to appropriately adjust the timing of each tower in order to adapt to the conditions of PSA operation at low load.
It is recommended to contact the design institute to add a hydrogen circulation pipeline, using this pipeline to control the amount of hydrogen sent out
Running at low processing volumes is not recommended, as it causes significant damage to the equipment; we require a processing level of at least 50%, and any excess hydrogen should be burned off.
Continuous operation is required, but the specified threshold is too low; the device suffers from high energy consumption and unstable operation, which poses quite a few problems.
Typically, the design of such devices includes a minimum operating load; below this load, the thermal balance of the device is disrupted. The optimal operating load for the device is 100%, with regard to yield and energy consumption. As long as the unit operates at a load level that is not lower than the minimum required for design purposes, it is possible to reduce the operating load. By adjusting the operating time of the PSA, it is possible to increase the yield and reduce raw material consumption. If that still isn’t sufficient, then reduce the operating time of the PSA unit and increase the purity of the hydrogen produced; this results in a higher hydrogen content in the exhaust gases, which can be fed back into the combustion system as fuel. This reduces the need for primary fuel in the heat transfer oil system, thereby lowering the overall energy consumption of the plant. It is not recommended to operate with the machine parked or without feeding raw materials at night, as this will **reduce the catalyst’s service life**. Frequent starting and stopping cause the equipment to heat up and cool down repeatedly, which can lead to the loosening and leakage of flange bolts.