Low-temperature methanol washing of feed gas
Thread Content
If the pressure of a low-temperature methanol washing unit is 5.7 MPa under normal operating conditions, what will the pressure be once the feed gas supply is cut off? (Close the inlet and outlet valves after detecting no air flow)
It depends on whether the methanol cycle has stopped; if it hasn’t stopped, the system will experience a drop in pressure, while if it has stopped, pressure may increase due to rising temperatures. There are no available data regarding the specific values.
The pressure will definitely drop; it just depends on how long it takes and by how much the pressure decreases! The longer it takes, the more it drops!
It depends on the situation after breathing stops. Generally, if there is still nitrogen present when closing the inlet and outlet valves, nitrogen is used for stamping. The system continues the methanol cycle. If the pressure cannot be maintained, the machine must be stopped for handling. . Some companies also use recirculating compressors to pressurize the system. This is pretty good too
What was said on the 4th floor is good; if the pressure cannot be maintained for too long due to a lack of airflow, the machine should be stopped. The circulation rate of lean methanol should be reduced at the time of shutdown. At the same time, the rich methanol from Tower 1 also needs to be transferred to the subsequent towers. How low the pressure will drop after the gas supply is cut off depends mainly on the duration of that interruption
The system pressure will drop after the air is released~! If the methanol circulation is not stopped, nitrogen purging must be carried out on the high-pressure system~! The pressure of nitrogen ramming depends on the pressure of the nitrogen used for ramming~! Some factories, as mentioned on the fourth floor, supply low-pressure nitrogen at the inlet of the recycle gas compressor to pressurize the system