Selection of the Evaporation Mode and the Possibility of Saving Electrical Energy when Operating Liquified Petroleum Gas Regasification Systems

摘要

In the modern international practice of liquefied petroleum gas supply to consumers, systems for propane-butane mixture regasification based on electric vaporizers of various steam capacity, which operate, in different modes of evaporation depending on the design, are widely used. Use of the continuous-flow evaporation mode when Froude numbers of the vapor-liquid flow is greater than 5,9×10−3±20% provides a lower value of the average boiling point of the propane-butane mixture, as a result it increases the value of the temperature drop in the coolant-boiling mixture of propane-butane system and reduces the heat exchange surface and metal content in the industrial evaporator by 15-18% compared to the continuous-flow evaporation mode when Froude numbers of the vapor-liquid flow is less than 5,9×10−3±20%. The proposed recommendations for saving electrical energy for the liquefied petroleum gas regasification with a low propane content due to the evaporation of the liquid phase in the ground flow heat exchanger to an intermediate dryness factor provide an average annual saving of electrical energy for regasification of 33,7%.