(4.2.1)--任务2饱和蒸气压的测定.ppt

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Task 2 Determination of saturation vapor pressure True vapor pressureReid Vapor Pressure (RVP)Vapour pressure when gasification rate is zero, It is often used to calculate the composition of gas and liquid phase, convert the boiling point of hydrocarbons, under different pressures or calculate the liquefaction conditions of hydrocarbons in process calculationUse a specific instrument, vapor pressure of oil determined by specific instruments under specified conditions, it is mainly used to evaluate the gasification performance, start-up performance, gas resistance, tendency and light components lost during storage of gasolineI. Determination of the significance of saturation vapor pressuresaturationVapor pressureAt a certain temperature, the vapor pressure when the gas-liquid two phases are in equilibrium Temperature-dependent. The vapor pressure of petroleum products increases with increasing temperature and decreases with decreasing temperature.Temperature21It is related to the type and composition of substances. Generally at a certain temperature the lighter the oil fraction, the greater the vapor pressure. The composition of some oil products will change with the gasification rate, When the gasification rate increases. Its vapor pressure will also decreaseTypes and composition of substancesFactors affecting saturation vapor pressure 030201Evaluate gasoline vaporizability. The gasified property of the gasoline can be evaluated. The higher the saturated vapor pressure of gasoline, the easier it is to vaporize, the faster the engine starts, the more efficient the gasoline combustion, and the lower the fuel consumption.It is possible to determine whether gasoline has a tendency to form air resistance when used. It is possible to judge whether gasoline has a tendency to form gas resistance when in use. High gasoline vapor pressure tends to make gasoline form air resistance in the pipeline, making the fuel supply insufficient or interrupted, causing the engine power to

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