Detailed steps for adding a flash model are shown in Fig. Pressure drop and temperature of theįIGURE 7.6 Specifying reaction data for the process.įIGURE 7.7 Specifying pressure drop and extend of reaction for the reactor.įIGURE 7.8 Simulation report of the conversion reactor.įIGURE 7.9 Displaying component molar flowrates on the process flow diagram.Īdding a flash model for the primary separation process.įlash column are set at 2.0 psi and 93 C C, respectively. 7.9).ħ.4 STAGE 3: MODELING OF SEPARATION UNITS A flash drum is used to separate the reactor effluent stream (S2) into vapor top (S3) and liquid bottom (S4) streams. 7.8) and examine the simulation results (Fig. On the completion of specifying the reactor, the user can proceed to execute the simulation (Fig. We proceed to define pressure drop and extent of reaction for the reactor (see detailed steps in Fig. It can be defined in the Reaction Data Sets window. Reaction stoichiometry and fractional conversion must be supplied for a conversion reactor simulation. Double-click on the reactor column to key in thermal specification, extent of reaction, and reactor data (see Fig. For the conversion reactor, the user is required to key in the reaction data. Detailed steps for this step are shown in Fig. Component flowrates, temperature (T), and pressure (P) of the stream are given in Table 7.1. We then proceed to define reactor feed stream properties.
TABLE 7.1 Specifications for Process Feed Stream (Foo et al., 2005) ComponentsįIGURE 7.5 Defining feed stream properties. 7.4).įIGURE 7.4 Construction of flowsheet topology on a process flow diagram. The user is required to create an input stream, S1, and an output stream, S2, after selecting the conversion reactor, R1, from the right panel (refer detailed steps Fig. For this case, a conversion reactor is used for demonstration. A list of unit operation models are classified as general, pressure change, column, reactors, heat exchanger, solid, batch, utilities, user-aided, classic, and miscellaneous categories. See Chapter 3 for detailed discussion on thermodynamic selection.īasics of Process Simulation With SimSci PRO/II Chapter j 7įIGURE 7.3 Selection of property calculation system using the SimSci-thermodynamic data.ħ.3 STAGE 2: MODELING OF REACTOR To select the equipment, a user can choose unit operations from the right side column of the flowsheet. For this process, PengeRobinson model1 is to be used.ġ. All rights reserved.įIGURE 7.1 Units of measure of the PRO/II.įIGURE 7.2 Component selection from the system or user-generated databank.ħ.2.3 Thermodynamics Method Thermodynamic methods are used to simulate the physical behavior of component system by calculating several physical properties (refer detailed steps for thermodynamic data in Fig.
7.1).ħ.2.2 Component Selection User is required to define the components, viz., nitrogen, ethylene, i-butane, n-butane, and n-octane using the component selection from the “Input” windows features (refer detailed steps for component selection in Fig. The individual steps are discussed in the following subsections.ħ.2 STAGE 1: BASIC SIMULATION SETUP 7.2.1 Units A user can select different “Units of Measure” such as English-Set1, MetricSet1, and SI-Set1 prior to start of a new process flowsheet (refer detailed steps for change of units in Fig.
The basic simulation setup involving the registration of components, thermodynamic model, and reaction stoichiometry is to be carried out in the Component Selection window, Thermodynamic window, and Reaction Component window of PRO/II, respectively, while the other steps are carried out in the flowsheet. The case study on n-octane production (Example 1.1) is used for illustration throughout the chapter.ħ.1 EXAMPLE ON N-OCTANE PRODUCTION A simple example that involves the production of n-octane (C8H18) is demonstrated (Foo et al., 2005), with detailed descriptions given in Chapter 1. The concept of simulation is based on sequential modular approach and follows the onion model for flowsheet synthesis (see Chapter 1 for details). This chapter aims to provide a step-by-step guide in simulating an integrated process flowsheet using SimSci PRO/II (Schneider Electric, 2015). Basics of Process Simulation With SimSci PRO/II Chien Hwa Chong Taylor’s University, Subang Jaya, Malaysia