Starting HYSYS

This chapter begins by starting HYSYS and how to select the right components and fluid package for simulation pmposes. Knowing how to start HYSYS and get familiar with its desktop is very important in this chapter. The second part is about how to enter and re-enter the simulation enviromnent, and get familiar with simulation flowsheet. In this part, users will be informed some important features of HYSYS. The last part is dealing with how to add and specify material streams for simulation. Variables specification is one of the important steps that users need to understand when dealing with HYSYS. 

In the first part of this chapter, we opened it with how to start HYSYS and get familiar with its desktop environment. We also discussed how to select components that will be used in simulation. Selecting the right fluid/thermodynamic package is veiy important and therefore we provided a flowchart that will assist users to select the right thermodynamics models. 

Start HYSYS and create a new case. Your first task is to set your Session Preferences. 

Start HYSYS and choose Peng Robinson as Base Property Package. Open Component page of Fluid Package window and add components (ethylene (or ethene), hydrogen chloride, ethyl chloride, and nitrogen) and close the Fluid... 

Unsteady-state or dynamic simulation accounts for process transients, from an initial state to a final state. Dynamic models for complex chemical processes typically consist of large systems of ordinary differential equations and algebraic equations. Therefore, dynamic process simulation is computationally intensive. Dynamic simulators typically contain three units (i) thermodynamic and physical properties packages, (ii) unit operation models, (hi) numerical solvers. Dynamic simulation is used for batch process design and development, control strategy development, control system check-out, the optimization of plant operations, process reliability/availability/safety studies, process improvement, process start-up and shutdown. There are countless dynamic process simulators available on the market. One of them has the commercial name Hysis [2.3]. 

Hysys.Operator Training start-up, shutdown or emergency conditions, consisting of an instructor station with DCS interface, and combined with Hysys.Plant as calculation engine. 

Select File/New/Case or press Crtl+N or click on the New Case to start a new case. In HYSYS, your simulation is referred to as a case . This will open up the Simulation Basis Manager which is where all of the components and their properties can be specified. 

To enter information about the material stream, double click on the stream to show the window shown in Figme 1-10. It is within this window that the user specifies the details regarding the material stream. For material stream that will be used as an input, we need to specify four variables. Within HYSYS environment, input material stream always have four degree of freedoms. Meaning, we need to supply fom information in order to fulfill the requirement for HYSYS to start its calculations. 

The first step in building any simulation is defining the fluid package. A brief review on how to define a fluid package and install streams is described below. For a complete description, see the previous chapter (Chapter 1 Starting with HYSYS). 

In the first part of this chapter, we started with a problem to find the pump outlet temperature when given the pump efficiency. Pump basically used to move liquids. In this chapter the user operated a pump operation in HYSYS to model the pumping process. The user also been trained on how to connect streams to unit operations such as pump. 

In the first part of this chapter, we started with a problem to develop a model that represents the partial oxidation reaction of methane to produce hydrogen. The partial oxidation method relies on the reaction of the methane with air in order to produce carbon oxides and hydrogen. The user also learns how to add the conversion reactions and reactions sets in HYSYS. 

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