The matrix equation has the advantage of clear structure, simplifying to different effect number easily or not having preheat. Thereupon, all parameters of distillation system could be obtained through solving Material-balance and energy-balance equations by iterative method and matrix method, calculating theory plate number by stage by stage method and correlative aided calculation such as bubble-point calculation, dew-point calculation, preheater calculation et.
The principle and programming method of dew-point calculation for LPG are discussed, the precision of several methods for the calculation of pure liquid saturation vapor pressure used in the dew-point calculation for LPG is analyzed, and the flow chart of dew-point calculation program for LPG and the original program of a example are given.
The regularity in the project calculation defines the precision as the fourth decimal place. However,the analysis precision for the contents of the heavy components in hydrocarbon is the sixth decimal place,which has the importance to the calculation of the hydrocarbon dew point.
Besides the experimental research, the simulation and calculation for the research objects were performed. This paper first reviews the main acid dew point calculation formulas at present. Based the flue gas composition of typical fuels, the acid dew point was computed.
The constants of Antoine equation that are used to calculate the saturated vapor pressure of components in LPG dew point calculation are redetermined in the usual temperature range of gas engineering,so Antoine equation is more applicable for programming calculation of LPG dew point,and calculation precision is improved.
The LKP equation is a fairly accurate equation of state, appli cable in vapor-liquid binary systems. A method for calculating the babble and dew points iu distillation plants by means of the LKP equation, using the theory of iterative mathematics, is shown in this article. The program for computing a distillation tower is given. Satisfactory calculations are made for hrdrocarbon systems.