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«© 2013 Aspen Technology, Inc. AspenTech®, aspenONE®, the Aspen leaf logo, the aspenONE logo, and OPTIMIZE are trademarks of Aspen Technology, Inc. ...»

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Jump Start: Acid Gas Cleaning in Aspen HYSYS ®

A Brief Tutorial (and supplement to training and online documentation)

Luisa Herrmann, Product Marketing, Aspen Technology, Inc.

Manya Garg, Product Management, Aspen Technology, Inc.

© 2013 Aspen Technology, Inc. AspenTech®, aspenONE®, the Aspen leaf logo, the aspenONE logo, and OPTIMIZE are trademarks of Aspen Technology, Inc. All rights reserved.11-4005-0813

Jump Start: Acid Gas Cleaning in Aspen HYSYS ®

Contents

Introduction..................................................................................................... 1 Scope of this Document.......................................................................................... 1 Example Cases................................................................................................. 2 Properties Environment.......................................................................................... 2 Component List................................................................................................. 2 Heat Stable Salts................................................................................................ 4 Property Package............................................................................................... 4 Reactions...................................................................................................... 5 Simulation Environment......................................................................................... 6 Flowsheet...................................................................................................... 6 Unit Operations................................................................................................. 6 Columns................

–  –  –

Introduction The new Acid Gas Cleaning capability in Aspen HYSYS allows users to more rigorously simulate gas processing from

beginning to end, including the removal of acid contaminants. This new feature allows users to model:

• Amine treating for gas sweetening

• Sulfur removal, including hydrogen sulfide, mercaptans, COS, and CS2

• Carbon dioxide removal

• Amine regeneration

• Amine degradation This feature is a part of HYSYS, which allows users to seamlessly integrate it with existing models for Gas Processing, making modeling easier and more accurate.

Scope of this Document This document is intended as a “getting started” guide. It will cover the process of creating a new case for Acid Gas Cleaning, setting up component lists, fluid packages, and working in the simulation environment to build the model. It is not meant as a standalone reference document. We recommend pairing this guide with a range of other resources,

including:

• AspenTech knowledgebase items, training, and sample models available in aspenONE® Exchange

• AspenTech Online Training modules available from within the product

• AspenTech support website (support.aspentech.com)

• AspenTech courseware available in on-line and in-person versions

• AspenTech business consultants Knowledge of Aspen HYSYS V8 is assumed for this guide, and Aspen HYSYS V8.3, Aspen Plus® V8.2, along with the V8.2.1 patch need to be installed for access to the functionality. If you do not know how to build a flow sheet in Aspen

HYSYS, you should first consult reference material on this subject. We recommend the following:

• Jump Start Guide: Getting Started with HYSYS V8

• AspenTech support site

• Getting Started with Aspen HYSYS Computer Based Training module

• Aspen HYSYS training course

–  –  –

Example Cases A number of example Acid Gas Cleaning cases are available in aspenONE Exchange and through the Samples folder within Aspen HYSYS V8.3. These sample cases can serve as a starting point for your modeling, as they have a completed set up Properties Environment and a completed flowsheet in the Simulation Environment. You can start with one of these example files and edit some basic input parameters to have a case ready for simulation. The following example cases are

available:

• Acid Gas Cleaning using MDEA





• Acid Gas Cleaning using MDEA + Piperazine

• Acid Gas Cleaning using DEA

• Acid Gas Cleaning using DGA

• Acid Gas Cleaning using MEA

• Acid Gas Cleaning using DIPA

• Acid Gas Cleaning using TEA

• Acid Gas Cleaning using Sulfolane + MDEA

• Acid Gas Cleaning using Sulfolane + DIPA

• Acid Gas Cleaning using PZ

• Effect of Heat Stable Salts on Acid Gas Cleaning using MDEA

• Acid Gas and COS-SO2-Mercaptans Cleaning using MDEA For this Jump Start Guide, we will be creating a model for Acid Gas Cleaning using MDEA.

Properties Environment The first step in building any HYSYS flowsheet is setting up the Properties Environment. In this environment, the user selects the components that will be used in the simulation and groups them into Component Lists. The user must also select one or more Property Packages, which are models for the calculation methods for physical properties. The combination of a Component List and a Property Package is called a Fluid Package, and the user must define a complete Fluid Package before they can move on to the Simulation Environment.

Component List When modeling an Acid Gas Cleaning process, the first step in building the HYSYS model is to create a component list including all the components used in the process. In this case specifically, the following components must be added in order to simulate gas cleaning.

–  –  –

Figure 1: The Component List populated with all necessary components for Acid Gas Cleaning. On the right, the option to “Add Heat Stable Salts” appears.

Other common components, such as lighter hydrocarbons, can be added depending on the characteristics of each individual process scenarios.

The following amines and amine blends are supported by the Acid Gas Cleaning functionality:

• Methyldiethanolamine (MDEA)

• Piperazine (PZ)

• PZ + MDEA

• Diethanolamine (DEA)

• Diglycolamine (DGA)

• Monoethanolamine (MEA)

• Diisopropanolamine (DIPA)

• Triethanolamine (TEA)

• Sulfolane + MDEA

• Sulfolane + DIPA

–  –  –

Heat Stable Salts When components associated with Acid Gas Cleaning are added to the component list, an additional option appears, as seen in Figure 1.This is the option for adding Heat Stable Salts to the component list. These salts may be present in the amine treating process and decrease the efficiency of the amine present in solution. Therefore, it is important to add Heat Stable Salts to the simulation so that they can be modeled accurately and troubleshot accordingly. Aspen HYSYS V8.3 allows you to add the most commonly found salts with one click (Figure 2).

Figure 2: Component List populated with addition of default Heat Stable Salts for more precise simulation.

Property Package After creating the Component List, it will need to be associated with a Fluid Package; each list can be associated with a different package. Aspen HYSYS V8.3 provides a Property Package designed specifically for Acid Gas Cleaning, called “Acid Gas”. When this option is selected, the required components and supported Amines and Amine Solvents will appear and they will need to be added if they are not yet selected before moving on to the Simulation Environment (Figure 3).

–  –  –

After selecting Acid Gas as a Property Package, you can then move into the Simulation Environment. If the required components have not been added, when you click the button to switch to the Simulation Environment, a pop-up reminder shows with the option to add the components automatically (Figure 4).

Figure 4: If not all required components are added to Component List, HYSYS can add them automatically before moving to the Simulation Environment.

Reactions The reactions and chemistry for this case are automatically generated by HYSYS using the underlying thermodynamics and calculation models in the Acid Gas property package, and the component list associated with the property package.

You don’t need to make any edits to this part, and can proceed straight to the Simulation Environment. However, if you would like to analyze the underlying reactions in the process, they are available in the Properties Environment under the “Reactions” tab, as seen in Figure 5.

Figure 5: Reaction list for the Acid Gas Cleaning process generated automatically when Components and Properties related to Acid Gas Cleaning are entered.

–  –  –

Simulation Environment Flowsheet In the Simulation Environment, you will find a blank page on which to build your model. The necessary Unit Operations that can be added to the flowsheet for the process simulation, including Columns and Streams, can be found under the “Flowsheet/Modify” tab in HYSYS, by clicking the “Models and Streams” button. For reference, Figure 6 displays a completed flowsheet of the Acid Gas Cleaning process and how it appears in HYSYS.

Figure 6: A complete flowsheet of the Acid Gas Process in HYSYS.

Unit Operations The Unit Operations required for the simulation of the Acid Gas Cleaning process include, but are not limited to, several columns, streams, heat exchangers, a valve, a pump, and a makeup unit. The ones needed for the most basic process are outlined below.

Columns In the Simulation Environment flowsheet, you will need to add the three most important columns for the Acid Gas Cleaning process. Those are the Absorber, the Regenerator (which will be defined from a Distillation Column), and the Separator, which can be found in the Palette, as shown in Figure 7. These columns are necessary for the gas cleaning and amine regeneration portions of the process, and should be added first. For the Absorber column, you can make one of the following selections from the palette: Absorber, Reboiled Absorber, Refluxed Absorber, or Custom Column. For the Regenerator, you can pick the Distillation column from the palette. For the separator, a simple Separator block will do.

–  –  –

Figure 7: The basic equipment necessary for the Acid Gas Cleaning simulation model: the Absorber, the Regenerator (a Distillation Column), and the Separator.

Absorber The Absorber should be set up first, with the help of the Absorber Column Input Expert, shown in Figure 8. On the first page, the connected streams, total number of stages, and inlet stage are selected. On the second page, enter the top and bottom stage pressures, and on the third, the estimated top and bottom temperatures, which are optional. The bottom pressure will usually be the pressure of the feed gas stream entering at the bottom of the column and the top pressure will reflect a small pressure difference of about 3-5 psi.

Figure 8: The Absorber Column Input Expert, which helps with the setup of the Absorber column. The first page, where the connected streams are selected, is shown.

–  –  –

When setting up different parameters for the Absorber column, HYSYS V8.3 provides smart defaults to converge your column more quickly. However, there are also several different options to customize your design, including multiple column options for the Absorber column, which can be selected in the “Parameters” tab, under the “Acid Gas” ply on the left, as seen in Figure 9. Under that same ply, there are also options available for different types of tray or packing internals, as seen in Figure 10.

Figure 9: Column types available under the “Acid Gas” Ply in the “Parameters” tab in the Absorber Column.

Figure 10: Options for column packing calculations in the “Acid Gas” Ply in the “Parameters” tab in the Absorber Column.

–  –  –

It is also possible to select the type of calculation being done on the column for the Acid Gas process, choosing between the more rigorous rate-based “Advanced Modeling” option and the quicker “Efficiency” option, as seen in the close-up in Figure 11. The efficiency type is the one most commonly used; it is a highly rigorous method that uses rate-based calculations in the background to calculate stage efficiencies of H2S and CO2, and then uses these values to solve the column. The accuracy and ease of use of this method is enough for most user cases. In some expert cases, however, the user has the option of switching to the more rigorous Advanced Modeling type that uses rate-based calculations to calculate the column itself. This type can be used for specifying or monitoring a larger number of variables, or for modeling mercaptans, COS, and CS2.

Figure 11: Close-up of the Calculation Type options in the “Acid Gas” Ply. The “Efficiency” option yields faster results, while “Advanced Modeling” should be used for more rigorous calculations.



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