Vortex Pressure Reduction Station for Natural Gas - Transmission & Distributoin

8/13/2019 Vortex Pressure Reduction Station for Natural Gas - Transmission & Distributoin

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Vortex Pressure Reduction Stations Transmission & Distribution Applications(VPRS)

An application of the innovative technology of

Prepared by:Gasficient Consulting Services

2012 Universal Vortex, Inc. All Rights Reserved. UVI logo is used with permission


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Copyright 2014 - GasficientConsulting Services

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Vortex PRS with Thermal Conditioning

Pressure Reduction using VPR Non-Freeze Pressure Reduction

Eliminates Pre-Heat

Thermal Conditioning after PressureReduction by Warming the Cold Flow in Ambient Air Heat Exchangers


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VORTEX TUBE (VT) PRINCIPLE

Cylindrical device to reduce the pressure(expand) pressurized gas

During pressure reduction the releasedgas undergoes mass & energy separation

Cold & hot flows form


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Indicative Example :Inlet 100 barg, 20 C, 100% of FlowHot Outlet 10 barg, 50 C, 50% of FlowCold Outlet 10 barg, -25 C, 50% of FlowAmbient Air Temperature 20 C. used to warm cold flow to 15 CRe-combined hot and cold flows 32.5 CJ-T is ~ 40 C so without Vortex Tube the combined flow would be -20 C

NB: Example is indicative and actual site specific conditions including gas specificationmust be considered


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UVI VORTEX TUBE INNOVATIONS

High thermal efficiency Application of mass & energy separation to selfheating: allows use of the Vortex Tube as a primary non-

freeze pressure reducer without pre-heat, even forhigh dew point gases

Single Outlet Vortex Tubes enhanced self heating and heat transfer

Integral heat exchanger:

Have the ability, concurrent with pressure reduction ofa primary gas stream, to heat a secondary gas stream.


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UVI VT PROCESS OPPORTUNITES

Non-freeze Pressure Reduction Pressure reduction without preheat

Dissipate/Add heat to process flow Reduce or eliminate the requirement for pre-

heating prior to pressure reduction

Provide heat or cold to a secondaryprocess flow Heat Exchanger can be configured to provide

refrigeration / cooling loads


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VPRS Basic Design

Pre-heat is not required for vortex pressurereduction as the high pressure gas undergoesnon-freeze pressure reduction in UVIsproprietary self-heating vortex tube.

After passing through the vortex tube thepressure reduced gas is warmed in a heatexchanger.

The heat exchanger is warmed by a low grade

heat source or often simply by ambient air.


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Vortex Tube Maximal Flow

Maximal flow is required for optimal mass& energy separation Flow through a vortex tube is maximal

when flow becomes critical (choked flow)at some points in the vortex tubes.

Maximal flow if the inlet:outlet pressure is~2.2:1 or greater.

Maximal flow rate is proportional to inletpressure


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Maximal Flow


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Basic Configuration

Pressure Regulator upstream of a VPR Sensing line and set for a specific VPRoutlet pressure


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Variable Pressure Regulated VPR Inlet

The variable pressure, regulated VPR inletconfiguration provides control of VPRoutlet pressure while varying the VPR inletpressure.

As the regulator responds to achieve thedownstream pressure it increases ordecreases the inlet pressure of the VPR

VPR inlet pressure will vary as required to

provide appropriate flow capacity tomaintain the downstream pressure.


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VPRS Design

Single stage vortex pressure reductionand thermal conditioning Dual outlet VPR to enhance the available

natural gas thermal conditioning Pressure regulators and VPR with a Gas

Management System result in efficientoperation throughout the range of designinlet pressures and flow rates.


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Type of Vortex Pressure Reducer

Dual stream outlet VPR (VPR-DS) are used. After non-feezepressure reduction the coldstream is thermally conditionedbefore merging with the hotstream to provide a suitabletemperature supply of gas to theFine Tune Regulator.


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Gas Management System Control

Using a GMS it is possibleto select VPR runs in anysequence as required tomatch the cumulative VPRcapacity with the requiredflow.

Comprised of on/off solenoidvalves, programmable logiccontroller (PLC), pressureand temperaturetransmitters


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VPR Runs

Assuming the minimum size VPR has acapacity of 1 and the sizes of the other requiredVPR are expressed relative to this minimumsize only 8 VPR (a through h) are required toprovide VPR capacity as a multiple of thesmallest VPR capacity 1 from 1 to 121

Flexibility to adjust the total active VPR capacityit is possible to design a VPRS for 5% through121% of the design flow


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Heat Exchangers

For ambient air a finned tube heatexchanger is recommended Gas temperature is warmed to

within 5 degrees of the ambient airtemperature as it flows through theheat exchanger

Run switching with a second heatexchanger may be required for"defrost" of the passive unit sinceice may build up due to otherwisecontinuous flow of sub-zero gas

A small heater may be used to aidthe melting


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Value Added by Using the Cold Fraction

Rather than simply "waste" the cold use itto cool a control room or instrument panel. Via heat exchanger with cold fraction a

refrigerant can be cooled....the refrigerant

can then be used for air conditioning orchilling Example 1: 1000 Sm3/hr, 100 bar to 20 bar pressure

reduction yields potential 4 tonne cooling capacity Example 2: 1000 Sm3/hr, 20 bar to 4 bar pressure

reduction yields potential 1 tonne cooling capacity


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ADVANTAGES OF UVI PRODUCTS

Thermal conditioning without an externalfuel (eg gas or electricity) Can be used in

Existing facilities retrofitting.

New facilities In addition to fuel savings, as there are nomoving or wear parts there is no routinemaintenance.

Rapid payback of investment dependingon & gas flow, pressure differential & sitecondition.


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Energy Savings & Environmental Benefits VPRS may save fuel gas equivalent to

0.2% of total flow. For 1 MMSm3/daypotential savings are: 2,000 Sm3 per day or 730,000 Sm3 annually 27000 MMBtu @ $10 = $270,000/year Carbon Dioxide 1600 Tonnes/year

Sulphur Dioxide 0.008 Tonnes Particulates 0.1 Tonnes

For a Pipeline System multiply by the dailycapacity to estimate potential savings


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Conclusion

Questions & Discussion

(VPRS are financially viable providing savings in fuelgas and greenhouse gas emissions.......clean, green and affordable)

Vortex Pressure Reduction Station for Natural Gas - Transmission & Distributoin

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