Request the pressure-enthalpy diagram for hydrogen chloride gas, or calculations for throttling refrigeration.
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I would like to calculate how much cooling capacity can be generated by throttling hydrogen chloride gas at 1.0 MPa, -40°C, and a flow rate of 1500 kg/h to atmospheric pressure
This post was last edited by arpcd on 2011-5-2 at 15:47. At -40℃, the saturated vapor pressure of HCl is 0.765 MPa(A); your current pressure is 1.0 MPa, so whether it’s gauge pressure or absolute pressure, HCl must be in a subcooled liquid state and cannot be in a gaseous state. Please, the original poster, confirm the state and composition of HCl before throttling (whether the HCl is pure). When HCl in liquid form is throttled, vaporization occurs; the vaporization rate is around 16% (that is, the amount of gaseous HCl = 1500 x 16% = 240 kg/h). The temperature after throttling is -85°C, which corresponds to the saturated HCl liquid and gas at atmospheric pressure. You can then estimate the cooling capacity.
Sorry, I made a mistake. It should be liquid hydrogen chloride; after throttling and expansion to atmospheric pressure, it enters the absorber in gaseous form. Could you help calculate this? Thank you