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| EnerTech USA, Inc. Full-Chain Small Scale LNG Solutions |
Over years of engineering, design, installation, commission and
operation, our proprietary gas liquefaction processes, EnerEXP
and EnerMR, have achieved significant improvement both in
efficiency and reliability.
Please link below for detail about our innovative proprietary gas
liquefaction processes:
* * * * * *
EnerEXP process employs refrigeration generated by a single
closed-loop isentropic gas expansion. The refrigerant gas is
either nitrogen or the boil-off gas generated from final product
flash or LNG storage tank.
In the EnerEXP process, work and refrigeration are extracted
from gas expansion. The refrigeration is used to aid the
liquefaction process and the work extracted is utilized to partially
re-compress the refrigerant gas. From the thermodynamic
standpoints, this expansion cycle is as efficient as the most
advanced mixed refrigerant cycles. With today’s turbo-expander’
s efficiency reaching more than 85%, this process represents an
emerging opportunity in small scale LNG.
If gas engine or gas turbine is used to drive the refrigeration
recycle compressor, the EnerEXP can integrate an absorption
refrigeration unit to the gas expansion cycle to assist the
refrigeration as an option. The absorption refrigeration unit uses
the exhaust waste heat of gas engine or turbine as heat input.
This integration will significantly increase the plant overall
refrigeration efficiency.
EnerEXP process is able to achieve a mid level specific
refrigeration energy consumption of 0.20 - 0.23 hp/lb LNG (13.5
– 15.5 kW/ton-day LNG).
EnerEXP process has the advantage of using a simple cooling
system with a relatively small number of pieces of equipment
operating at cryogenic temperatures and a fast approach to
equilibrium upon warm start-up. The simplicity of the design and
the self-equilibrating nature of the process provide a
straightforward operation. The process is not very sensitive to
reasonable changes in feed gas composition and does not need
premixed refrigerant.
* * * * * *
EnerMR process utilizes a mixed refrigerant (MR), composed of
nitrogen, methane, ethane (or ethylene), propane, butanes, and
pentane. The component ratio is carefully chosen to make a
close approach between the hot condensing curve and the cold
boiling curve. The main heat exchanger can achieve 3°F
minimum temperature approach and 6°F - 8°F weighted LMTD.
The mixed refrigerant is compressed and partially condensed by
precooling prior to entering the highly efficient brazed aluminum
heat exchanger. Brazed aluminum heat exchanger contains a
number of stream channels, which allow multiple streams to be
heated or cooled. The mixed refrigerant (MR) is fully condensed
in one channel before it is flashed across an expansion valve,
which causes a dramatic reduction in temperature. This very cold
stream is used to cool the feed gas stream and warm MR stream.
Same as the EnerEXP process, if gas engine or gas turbine is
used to drive the refrigeration recycle compressor, the EnerMR
can integrate an absorption refrigeration unit to the mixed
refrigeration cycle to provide pre-cooling as an option. The
absorption refrigeration unit uses the exhaust waste heat of gas
engine or turbine as heat input. This integration will significantly
increase the plant overall refrigeration efficiency.
EnerMR process is able to achieve a lower level specific
refrigeration energy consumption of 0.19 hp/lb LNG (13.0 kW/ton-
day LNG).
operation, our proprietary gas liquefaction processes, EnerEXP
and EnerMR, have achieved significant improvement both in
efficiency and reliability.
Please link below for detail about our innovative proprietary gas
liquefaction processes:
- Gas Liquefaction Process -- EnerEXP
- Gas Liquefaction Process -- EnerMR
* * * * * *
EnerEXP process employs refrigeration generated by a single
closed-loop isentropic gas expansion. The refrigerant gas is
either nitrogen or the boil-off gas generated from final product
flash or LNG storage tank.
In the EnerEXP process, work and refrigeration are extracted
from gas expansion. The refrigeration is used to aid the
liquefaction process and the work extracted is utilized to partially
re-compress the refrigerant gas. From the thermodynamic
standpoints, this expansion cycle is as efficient as the most
advanced mixed refrigerant cycles. With today’s turbo-expander’
s efficiency reaching more than 85%, this process represents an
emerging opportunity in small scale LNG.
If gas engine or gas turbine is used to drive the refrigeration
recycle compressor, the EnerEXP can integrate an absorption
refrigeration unit to the gas expansion cycle to assist the
refrigeration as an option. The absorption refrigeration unit uses
the exhaust waste heat of gas engine or turbine as heat input.
This integration will significantly increase the plant overall
refrigeration efficiency.
EnerEXP process is able to achieve a mid level specific
refrigeration energy consumption of 0.20 - 0.23 hp/lb LNG (13.5
– 15.5 kW/ton-day LNG).
EnerEXP process has the advantage of using a simple cooling
system with a relatively small number of pieces of equipment
operating at cryogenic temperatures and a fast approach to
equilibrium upon warm start-up. The simplicity of the design and
the self-equilibrating nature of the process provide a
straightforward operation. The process is not very sensitive to
reasonable changes in feed gas composition and does not need
premixed refrigerant.
* * * * * *
EnerMR process utilizes a mixed refrigerant (MR), composed of
nitrogen, methane, ethane (or ethylene), propane, butanes, and
pentane. The component ratio is carefully chosen to make a
close approach between the hot condensing curve and the cold
boiling curve. The main heat exchanger can achieve 3°F
minimum temperature approach and 6°F - 8°F weighted LMTD.
The mixed refrigerant is compressed and partially condensed by
precooling prior to entering the highly efficient brazed aluminum
heat exchanger. Brazed aluminum heat exchanger contains a
number of stream channels, which allow multiple streams to be
heated or cooled. The mixed refrigerant (MR) is fully condensed
in one channel before it is flashed across an expansion valve,
which causes a dramatic reduction in temperature. This very cold
stream is used to cool the feed gas stream and warm MR stream.
Same as the EnerEXP process, if gas engine or gas turbine is
used to drive the refrigeration recycle compressor, the EnerMR
can integrate an absorption refrigeration unit to the mixed
refrigeration cycle to provide pre-cooling as an option. The
absorption refrigeration unit uses the exhaust waste heat of gas
engine or turbine as heat input. This integration will significantly
increase the plant overall refrigeration efficiency.
EnerMR process is able to achieve a lower level specific
refrigeration energy consumption of 0.19 hp/lb LNG (13.0 kW/ton-
day LNG).
TECHNOLOGY....
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