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Integrated NGL and LNG production. Heinz C. BauerVP technology of NG processing plants, Linde EngineeringGastech, Singapore, 27-30 October 2015

StarLNGLTMLinde AG Engineering Division 2

Biography

After graduation at the Technical University Munich as PhD in Applied Physics, Dr Heinz Bauer joined Linde Engineering 34 years ago. He worked in different positions in process design as well as sales and marketing. His focus has been on all kind of cryogenic gas processing including cracked gases, synthesis gas, refinery off-gases and of course natural gas. Presently he is responsible as Vice President for technology of natural gas processing plants.

[email protected]

mailto:[email protected]


Linde Engineering | LNG product range

Qmax BOGR

tpd10 100 1,000 10,000

1 10 mtpaLNG

0.10.01

Snøhvit LNG

FLNG

ShanShan LNGKwinana LNG

strong positionlimited marketdeveloping

positiongrowing market

CWHEmulti cycle

CWHEMR cycle

Micro LNG

simple setuplimited market

PFHEMR cycle

PFHEN2 cycle

LIN

StarLNGTM


Motivation for LNG + NGL

• hundreds of NGL recovery plants with ~200 MMSCFD feed

• C2 recovery/rejection depends on market prices

• CH4 production in gaseous (pipeline) or liquid (LNG) form opens new business channels U.S. Lower-48 States Natural Gas Processing Capacity

source: U.S. Energy Information Administration, eia


Tie-in point for LNG production

• tail-end tie-inoffers the most independent solution

• warm-end tie-inunloads residue gas compression

• cold-end tie-inallows for the tightest integration of NGL and LNG production, unloads residue gas compression

LNG

LNG

LNGselected


Cryo Module and LNG Storage

• a gaseous side stream of the demethanizer column overheads is sent to a Cryo Module




• after partial condens-ation of the vapor the liquid fraction is returned to the column




• after partial condens-ation of the vapor the liquid fraction is returned to the column

• the remaining light vapor fraction is liquefied, subcooled and sent to LNG storage


Refrigeration Unit

• refrigeration is provided by a proprietary Cryostar compander

• the working fluid of the compander is a N2/CH4 mixture

• heat of compression is rejected to the ambient by air cooling (base case) or water cooling


End-flash & BOG handling

• end-flash & boil-off gas from LNG storage is compressed and sent to the suction side of the residue gas compressor


Compander

• all 14 Q-max LNG carriers (including Mozah) have been equipped with two onboard BOGR systems each, which had been designed and manu-factured by Cryostar (a Linde company)

• the BOGR systems are built around a two-shaft compander

Mozahowned and operated by Qatargas 2

http://gcaptain.com/wp-content/uploads/2008/12/1.jpg


Cascaded Refrigeration Scheme

1. C3 pre-cooling2. work expansion of

feed gas3. work expansion of

mixed refrigerant

4. J-T refrigeration for sub-cooling


StarLNGLTM Process Features

In combination with an NGL plant

Double N2

expander process

Single mixed refrigerant (SMR) process

Mixed fluid compander (StarLNGLTM) process

Number of rotating equipment

High (N2 compressor, 2 expander/booster sets)

Low (MR compressor)

Low (MR compander)

Ease of operation High (good turn-down capability, easy start-up)

FairFair (elevated settle-out pressure, refrigerant handling)

High (same as N2 expander process)

Logistics of refrigerant make-up

Easy (only nitrogen) ComplexComplex (in addition to N2 and CH4 a choice of C2 to C5 components)

Easy (nitrogen plus methane)

Process safety Very high (only nitrogen)

FairFair (increased amount of C3+ in liquid form under pressure)

High (only volatile CH4 plus N2 in the refrigerant)

Efficiency Fair Fair (even with two expanders)

High (good heat integration using latent heat)

High (in combination with NGL plant)


Economics

• 10% more feed gas (220 instead of 200 MMSCFD) generates 10% additional NGLs

• load to the residue gas compressor is unchanged

• 6 MW net power demand of the compander generates 156-280 t/d LNG(100-180 kgpd) depending on gas composition

110%100%

110%

no extra load

6 MW

~218 t/d~140 kgpd


Conclusions

• Small-scale LNG production (100 – 180 kgpd) can be integrated smartly into conventional mid-scale NGL recovery plants

LNG + NGL → LNGLTM

• Refrigeration is based on a sophisticated cooling concept including Cryostar's proven compander

• Economics are favorable even during ramp-up of LNG production, as additional NGL product improves revenues

• Linde Process Plants, Tulsa, OK (www.lppusa.com) is glad to quote for your specific project

http://www.lppusa.com/

Thank you for your attention.

Heinz C. BauerVP technology of NG processing plants, Linde EngineeringGastech, Singapore, 27-30 October 2015

Download - Integrated NGL and LNG production

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