Synthetic Natural Gas (SNG), The LPG Opportunity · Dubai Palm Jumeirah •Base load system to...
Transcript of Synthetic Natural Gas (SNG), The LPG Opportunity · Dubai Palm Jumeirah •Base load system to...
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Synthetic Natural Gas (SNG), The LPG Opportunity
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SNG Overview
• Introduction to fuel interchangeability
• Components required for an SNG system
• Applications for SNG
• General comments regarding SNG
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Fuel Interchangeability
When LPG is mixed with air at the correct ratio, the resulting mixture will burn with the same characteristics as Natural Gas, making it an ideal fuel source to replace or supplement Natural Gas.
How does Interchangeability work? First, let’s look at the chemical make-up for each fuel:
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Wobbe Index
• W.I.= C.V.
• S.G. =Specific Gravity of Gas
• C.V. =Calorific Value or Heating Value
1
S.G.
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Limits of Inflammability for Common Fuels
SNG
(Propane)
57%
SNG
(Butane)
50%
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Another Advantage-Lower Dewpoint
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Components of SNG System
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Liquid LPG Pumps
• Two main types of pumps– Positive displacement
– Turbine
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LPG Vaporizers
• Four main types of Vaporizers– Electric – Dry and waterbath
– Steam – Bayonet and U tube
– Hot Water – Bayonet and U tube
– Gas Fired – Direct and Waterbath
• Classification– Explosion proof (Zone 1)
– Nonincendive (Zone 2)
– General Purpose
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POWER®-Series
Dry Electric Vaporizer
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Electric Waterbath Vaporizer
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Dry vs. Waterbath
Dry Electric
– No possibility for corrosion
– Short heat up time
– No sediment to clog pump or prevent heat transfer
– No glycol expense
– Acquiring a permit and soil remediation are not a problem.
– Waterbaths require more maintenance;
• Operator must take samples regularly
• Operator must add make-up water.
Waterbath Electric
– Individual heater elements can be replaced.
– No direct contact between the heater and the LPG.
– Spill containment (dyke) may be required.
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AZEOVAIRESteam/Hot water
Vaporizer
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DIRECT FIRED Vaporizer
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AQUAVAIRE Gas Fired
Waterbath Vaporizers
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VAPORAIRE Venturi Operation
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BLENDAIRE Three Port
Proportional LPG/Air Mixer
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BLENDAIRE
II Parallel Pipe Mixer
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Parallel Pipe vs. Three Port Piston
Parallel Pipe
• Feed Forward Control
• Includes flow meters on air and LPG line.
• Easier to convert to peak shaving mixer.
• Not as susceptible to clogging.
• No added cost for ARA feature.
• Infinite turndown with line pack feature.
Three Port Piston
• Feed back control
• Must add flow control valve and flow
meters to peak shave.
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Venturi vs. High Pressure Mixer
Venturi
• No need for an air compressor
• No chance to create an unsafe mixture so
control/operation is simpler; better
reliability.
• Accuracy to +/-5%
• Pressure from 350 mBar to 1 Bar.
• Infinite turndown.
• More maintenance required for 24/7
operation.
High Pressure Mixer
• Air compressor required
• Controls are more sophisticated to ensure
a safe mix.
• Accuracy to +/-1.5%
• More flexibility regarding ratio.
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GA500 Calorimeter
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DS Densitometer
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Calorimeter vs. Densitometer
Calorimeter
• Direct measurement of wobbe index
• Provides a 4-20mA signal for control.
• Requires compressed air
• Classification: General purpose
• Must be installed inside a temperature
controlled room.
Densitometer
• Indirect measurement
• Provides a 4-20mA signal for control.
• Does not require compressed air.
• Classification: Explosion proof
• Can be installed outdoors.
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Filtaire Oil Demister
• Removes heavy LPG oils
• Knitted stainless steel
wire mesh
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FlareStack
• Purpose: To allow the operator to tune/calibrate the mixer after periods of inactivity.
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Liuzhou City-Base Load in China
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Liuzhou City-Tanks
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Liuzhou – Unloading compressor
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Liuzhou-Pumps
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Liuzhou City-Mixer and Vaporizer
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Liuzhou Controls
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Liuzhou City-Base load in China
• 3 Stations, 1100 MM BTU/Hr each
• Each station designed for 50,000 households
• 30 PSIG
• 2 x 1,000,000 gallon spherical tanks, rail unloading
station, 3 x positive displacement pumps, 3 x hot water
vaporizers, 3 x proportional LPG/air mixers, 3 x air
compressors, 3 x dryers, 3 x air filters, 3 x LPG filters,
calorimeter and flare stack.
• Purpose: Base load to feed city
• LPG Consumption: 6100 tons/month
for each station
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Dubai - Palm Jumeirah
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Dubai-Palm Jumeirah Package
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Dubai-Palm Jumeirah
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Dubai Palm Jumeirah
• Base load system to supply SNG until NG arrives
• 250 MM BTU/Hr at 6 Bar
• STABILAIRE positive displacement pump, Packaged AQUAVAIRE vaporizer/BLENDAIRE mixer/FILTAIRE in 40 foot ISO container, GA500 calorimeter, flare stack.
• Purpose: Base load to feed city
• LPG Consumption: 1400 tons/month
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SNG General Comments
• Cost of a SNG system: 40-50% tanks, 25-35% equipment, 25-35% engineering/installation
• No technical limitation regarding the size of a LPG/air mixing station
• General rule: Higher pressure means higher cost
• Control can be completely automated
• Construction time for small system: 3 months
• Construction time for large system: 6 months
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SNG General Comments
• SNG allows LPG companies to market directly to the biggest energy users-NG users.
• SNG mixing allows the customer to fuel switch and use the cheapest fuel available.
• Can be used in mobile applications.
• Can be used for power generation applications, but must be careful of the following:
– Turbine applications require extremely high pressure; condensation is an issue.
– Engine applications may require a special ratio
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Questions?
Thank you for your time!!