If there are 5 tons of methanol in the pores of the packing in a packed tower, and it is purged with saturated steam at 0.3 MPa, with a safety valve installed on the steam pipeline, then:
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The packing in the packed tower contains 5 tons of methanol, and it is purged with saturated steam at 0.3 MPa; the steam pipeline is equipped with a safety valve. My questions are: 1. What is the maximum pressure that can be reached inside the packed tower? Will it exceed the pressure of the incoming steam, which is 0.3 MPa? 2. Since there is a safety valve on the main steam pipe, is it still necessary to install a safety valve on the packed tower? Is there any standard to guide this?
Without understanding the basic principles, one keeps approaching design with a liberal arts mindset. If one practices martial arts without working on their skills, they will achieve nothing in old age. When a valve is open, pressure flows only from high to low pressure; the pressure of the gas source is the highest. If the valve is closed, steam will heat and vaporize the fluid inside the sealed system, causing pressure to rise; overpressure may occur
At 0.3 MPa and a temperature of 145°C, the saturated vapor pressure of methanol is 1227 KPa; therefore, overpressure is possible.
A safety valve is used based on the medium in the distillation tower and the pressure at the top of the tower; it is necessary to install one when the pressure at the top of the tower exceeds a certain value during operation.