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Like Comment (2) Follow Reply PrivatelySeptember 12, 2012

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MEG Injection in Gas Dewpoint Control

Vinay Singhal

Process Engineering Manager at McDermott International Inc.

Following up on Kumar's earlier subject of fouling in MEG Regeneration

system, we presently have another issue with MEG injection into Wet

Gas, upstream of the Gas Dewpointing Package. The Gas Dewpoint

system comprises of:

(1) Upstream Gas-Gas Exchanger to pre-chill the incoming wet gas

(tube side) with out-going cold dewpointed gas (shell side)

(2) A Joules-Thompson Valve to effect pressure drop and further chill the

wet gas to condense water and heavy hydrocarbons

(3) Chilled, Dewpointed gas routed to a Low Temperature Separator

(sometimes called Cold Separator)to separate processed gas and

condensed liquids. The chilled process gas gets heated up after exchanging cold in the Gas-Gas

Exchanger.

Typically, MEG is injected/sprayed on the tube sheet of the Gas-Gas Exchanger at the warm end; to

absorb water (in mist form in the wet gas) and prevent hydrate formation; as the downstream temperatures

are below the hydrate formation temperature.

The problem we are facing is, instead of a typical Shell & Tube HX, Client is insisting on a PCHE (Priinted

Circuit Heat Exchanger). Unlike a S&T HX where MEG is sprayed on the tube sheet face; a PCHE design

offers no provision for MEG spray nozzles. Therefore, MEG is injected in the upstream line through an

injection quill. As a backup, HX downstream injection quill is also provided.

The concern we have is - How to ensure proper distibution of MEG in the wet gas to prevent hydrate

problems. Uneven MEG distribution would leave free water in certain gas pockets, which may then form

hydrates in the PCHE and plug the PCHE.

Question to the forum is: Has anyone employed PCHEs or other than S&T type of heat exchangers in this

service; and if yes, how do one ensure proper MEG distribution into the gas?

Some ideas thrown around include using a static in-line mixer (a structured packing block to increase

turbulence); employing a CFD study; etc.

But we are looking for actual implemented and working design. If you can provide reference and design

details of the actual facility, will be of further help.

Thanks in advance.

Vinay Singhal

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Like Reply privatelyDelete September 12, 2012

Krishna Kumar

Chief Process Consultant

Hi Vinay

MEG injection distributed in each gas flow path of PCHE was done in ConocoPhilips Kerisi CPP

project.

Heatric vendor had a prop internal to do that. they suppplied the eq in that project.

pls speak to vendors like them.

if i get hold of some dwg i will send you later.

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Like Reply privatelyDelete September 13, 2012

Vinay Singhal

Process Engineering Manager at McDermott International Inc.

Thanks a tonne, Krishna - this takes off a big worry from my shoulders

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