Chemical Engineering April 2021 - 34

Variable frequency drive (VFD). When
the generator is asynchronous, a VFD
is typically included to adjust the alternating
current (a.c.) signal to match the
frequency of the grid. Typically, designs
that rely on VFDs have higher overall
efficiencies than those with gearboxes
or other mechanical components. Systems
based on VFDs also can accommodate
a wider range of process variations
that may result in varying expander
shaft speeds.
Gearbox. In some expander designs, a
gearbox is used to reduce the rotational
speed of the expander to match the
generator's nominal rotational speed.
The use of a gearbox comes at the expense
of a reduction in overall efficiency,
and hence output electrical power.
Expander process design
When preparing a request for quotation
(RFQ) for an expander, process engineers
must first define the service conditions,
including the following information:
* Operating conditions (inlet and outlet
pressure, differential pressure, flowrate,
inlet temperature)
* Fluid properties (including gas composition,
molecular weight, viscosity,
specific heats ratio, dewpoint,
presence of corrosive or condensable
components)
* Design conditions (inlet and outlet design
pressure, design temperature
and rating)
* Site and utility data (location, elevation,
atmospheric conditions, utility
conditions, such as electricity, cooling
fluid, instrument air or steam or
heating fluid). Where multiple operating
cases are foreseen, process
engineers should clearly identify
these cases, as well as extremes of
process parameters (for example,
minimum and maximum inlet pressure)
and provide
process data
for each. They may also provide a
sketch of the proposed facilities,
such as a process flow diagram
(PFD) or piping and instrumentation
diagram (P&ID)
Mechanical engineers typically complete
the expander generator data
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Chemical Engineering April 2021

Table of Contents for the Digital Edition of Chemical Engineering April 2021

Contents
Chemical Engineering April 2021 - Cover1
Chemical Engineering April 2021 - Cover2
Chemical Engineering April 2021 - Contents
Chemical Engineering April 2021 - 2
Chemical Engineering April 2021 - 3
Chemical Engineering April 2021 - 4
Chemical Engineering April 2021 - 5
Chemical Engineering April 2021 - 6
Chemical Engineering April 2021 - 7
Chemical Engineering April 2021 - 8
Chemical Engineering April 2021 - 9
Chemical Engineering April 2021 - 10
Chemical Engineering April 2021 - 11
Chemical Engineering April 2021 - 12
Chemical Engineering April 2021 - 13
Chemical Engineering April 2021 - 14
Chemical Engineering April 2021 - 15
Chemical Engineering April 2021 - 16
Chemical Engineering April 2021 - 17
Chemical Engineering April 2021 - 18
Chemical Engineering April 2021 - 19
Chemical Engineering April 2021 - 20
Chemical Engineering April 2021 - 21
Chemical Engineering April 2021 - 22
Chemical Engineering April 2021 - 23
Chemical Engineering April 2021 - 24
Chemical Engineering April 2021 - 25
Chemical Engineering April 2021 - 26
Chemical Engineering April 2021 - 27
Chemical Engineering April 2021 - 28
Chemical Engineering April 2021 - 29
Chemical Engineering April 2021 - 30
Chemical Engineering April 2021 - 31
Chemical Engineering April 2021 - 32
Chemical Engineering April 2021 - 33
Chemical Engineering April 2021 - 34
Chemical Engineering April 2021 - 35
Chemical Engineering April 2021 - 36
Chemical Engineering April 2021 - 37
Chemical Engineering April 2021 - 38
Chemical Engineering April 2021 - 39
Chemical Engineering April 2021 - 40
Chemical Engineering April 2021 - 41
Chemical Engineering April 2021 - 42
Chemical Engineering April 2021 - 43
Chemical Engineering April 2021 - 44
Chemical Engineering April 2021 - 45
Chemical Engineering April 2021 - 46
Chemical Engineering April 2021 - 47
Chemical Engineering April 2021 - 48
Chemical Engineering April 2021 - 49
Chemical Engineering April 2021 - 50
Chemical Engineering April 2021 - 51
Chemical Engineering April 2021 - 52
Chemical Engineering April 2021 - 53
Chemical Engineering April 2021 - 54
Chemical Engineering April 2021 - 55
Chemical Engineering April 2021 - 56
Chemical Engineering April 2021 - 57
Chemical Engineering April 2021 - 58
Chemical Engineering April 2021 - 59
Chemical Engineering April 2021 - 60
Chemical Engineering April 2021 - 61
Chemical Engineering April 2021 - 62
Chemical Engineering April 2021 - 63
Chemical Engineering April 2021 - 64
Chemical Engineering April 2021 - Cover3
Chemical Engineering April 2021 - Cover4
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