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A loyal reader in Chemical Process Technology raised a question. I have a dry gas composition. As the gas is produced from reservoir, it is saturated with water. How to simulate in the HYSYS simulator ? How to calculate water content in wet gas ?
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From hydrocarbon - water equilibrium analysis, you will find that as you increase water content in dry gas, the water will mix with dry gas until the dry gas is saturated with water. Once it is saturated with water, any addition of water into the water saturated gas (normally called wet gas) will knock-out as free water in aqueous phase. This can be easily modeled in any process simulator like HYSYS.
Below image shows Dry gas stream is mix with Water in a 3-phase Separator unit operation. To saturate the Dry gas with water, the only requirement is increase the Free Water flow until the aqueous flow (Free Water) starts to knock off free water. In this case, an ADJUST unit is used to adjust the water flow until zero flow.
To find water content (in lb/mmscf), first check out the Water Mass Flow in Wet gas from composition, change the basis to mass flow. See following image.
Then find the Molar flow in MMSCFD. See following image.
In above example, the Water Mass Flow is 1233.6 kg/h (2719.6 lb/h) and Molar Flow is 1005 mmscfd. Thus,
Water content = (2719.6 x 24) / 1005 = 64.93 lb Water / mmscf Gas.
If you have better method, let us know.
Related Topic
Recommended :
Subscribe FREE - Plant Services
From hydrocarbon - water equilibrium analysis, you will find that as you increase water content in dry gas, the water will mix with dry gas until the dry gas is saturated with water. Once it is saturated with water, any addition of water into the water saturated gas (normally called wet gas) will knock-out as free water in aqueous phase. This can be easily modeled in any process simulator like HYSYS.Below image shows Dry gas stream is mix with Water in a 3-phase Separator unit operation. To saturate the Dry gas with water, the only requirement is increase the Free Water flow until the aqueous flow (Free Water) starts to knock off free water. In this case, an ADJUST unit is used to adjust the water flow until zero flow.
To find water content (in lb/mmscf), first check out the Water Mass Flow in Wet gas from composition, change the basis to mass flow. See following image.
Then find the Molar flow in MMSCFD. See following image.
In above example, the Water Mass Flow is 1233.6 kg/h (2719.6 lb/h) and Molar Flow is 1005 mmscfd. Thus,
Water content = (2719.6 x 24) / 1005 = 64.93 lb Water / mmscf Gas.
If you have better method, let us know.
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