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Revised: Nov 27, 2012

Hydrate Formationwith Aspen HYSYS

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Objectives

Understand the hydrate formation calculation within apipeline model in Aspen HYSYS

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Background

Hydrates are commonly formed in natural gas pipelineswhen water is condensed in the presence of methane at highpressures.

Natural gas hydrates are basically modified ice structuresthat enclose methane and other hydrocarbons.

The issue with hydrates is that at high pressures they havehigher melting points than ice and can cause blockages in

pipelines and other processing equipment.

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Background

There are several methods used to prevent hydrate formation inpipelines such as heating or reducing the pressure. A commonmethod used is to add a hydrate inhibitor (anti-freeze) such asethylene glycol which will decrease the temperature thathydrates will form.

In this demo we will be simulating the piping network that mixesstreams from 3 gas wells before they are sent to a gas-oilseparator. The ambient temperature is 0C, and as the gasstreams cool due to heat loss in the pipeline, the risk of hyrdateformation increases.

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Problem Statement

Using the pre-built Aspen HYSYS flowsheet PET-002H_Hydrate_Formation_Start.hsc, determine theflowrate of ethylene glycol that is required to prevent anyhydrates from being formed in the gas pipeline.

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Copyright

Copyright 2012 by Aspen Technology, Inc. (AspenTech). Allrights reserved. This work may not be reproduced or distributedin any form or by any means without the prior written consent ofAspenTech. ASPENTECH MAKES NO WARRANTY ORREPRESENTATION, EITHER EXPRESSED OR IMPLIED, WITHRESPECT TO THIS WORK and assumes no liability for any errors or

omissions. In no event will AspenTech be liable to you fordamages, including any loss of profits, lost savings, or otherincidental or consequential damages arising out of the use of theinformation contained in, or the digital files supplied with or foruse with, this work. This work and its contents are provided foreducational purposes only.

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