LNG calorific value measurements for small scale applications
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1 The 3 rd International "Metrology for LNG" Workshop FORCE Technology in Brøndby LNG calorific value measurements for small scale applications Hans-Peter Visser, Analytical Solutions and Products B.V. (ASaP) Distelweg 80m, 1031 HH Amsterdam, The Netherlands Tel , Mail info@asap.nl, Web
2 Clear objectives ASaP: 1. Supplying practical solutions for analytical requirements. 2. Being number 1 in our league.
3 ASaP Solutions 1. Standard Solutions. 2. Tailor-made Solutions. 3. Mission Impossible Solutions. Dear Mr. Nikolaou, You may contact mr H.P. Visser of ASAP company directly. Mr Visser is the Dutch representative of several analyzer manufacturers and I assume that he can help you with this problem. The company ASAP has a lot of experiences in this field. If they cannot solve this problem, nobody can. Best regards Ir. Hans Borsboom Principal Process Engineer Comprimo Sulfur Solutions Jacobs Nederland B.V.
4 Mission impossible solutions Advanced Burner Control + (ABC + ): very fast compositional analysis of SRU feed gas. ASaP Inclined Fall-Back Stokes Law probe: special probe for flare gas applications. ASaP 8943 LNG Probe/Vaporizer.
5 Development started September 2007 Bintulu, Malaysia
6 The LNG sampling & Vaporization challenges
7 Flow: 20 kg/hr 2bar Thermal leak: 24,8 W (1): sub cooled: J/kg dh: J/kg This flow equals approx. 950 l/min of NG to the analyser system.
8 Our design criteria Prevent partial vaporization => Secure LNG revenues! Full compliance with ISO 8943; 2007 KIS: Keep It Simple 1 utility: Power supply Flexible in power requirement No moving parts Insulation Special preservation for high vacuum lifetime stability (insulation). Sub-cooling by mother nature Flash vaporization No influence of process P & T changes in vaporization / Analytical results Zero Dead Volume accumulator Safety Hazardous area Flexibility
9 Design Boil-off Probe Flash & Flow control LNG NG Cooling -162 C Filtering, de-bubbling and Sub-cooling Vaporization by electrical heating
10 1 st Generation ASaP 8943 LNG Probe/Vaporizer Insitu or By-pass Cold section Vaporizing/ Flash section Hot section
11 2 nd generation Set-up Cold section: Low volume probe elimination of transfer line Primary shut off valve Filtering of sample, De-bubbling of sample, Sub-cooling of sample. All cryogenic parts are vacuum insulated. Cold section Vaporizing/Flash section Hot Section Vaporizing/Flash section: Vaporization of sample, Flow control of sample. Hot Section : Supportive latent heat to vaporize the sample, Mix the sample in order to assure a homogeneous gas phase sample. Zero Dead Volume accumulator
12 Preliminary results Qatar-project Extreme sub-cooling (too much ) Stable outlet pressure to GC Stable outlet flow to GC
13 Customer feedback To whom it may concern, At the request of ASaP this letter may serve as reference. The reasons for a happy customer from the Middle East to purchase the ASaP 8943 LNG probe/vaporizer from Analytical Solutions and Products B.V. (ASaP) are; It is the most advanced design which is currently commercially available on the market. It is the only vaporizer system which take care for a sub cooling of the sample before vaporisation. The Flange connection avoid any unnecessary heat leak on the sample transfer to the vaporizer system. Due to the flexible design on the orifice and heater system, the flow can be easily adjusted to the process requirements as well as to the required flow rate to overcome the natural heat input to the sample. It has no moving parts and it is flexible in configuration. Installation work on site is expected to be kept to a minimum. Operational and maintenance costs are predicted to be minimal. The ASaP solution appears to be the perfect match for a happy customer from the Middle East with regards to technical requirements, flexibility and planning. With the investment of a happy customer from the Middle East in ASaP s 8943 LNG probe/vaporizer, a return on investment of 1 to 2 weeks is predicted. Quote from the Factory Acceptance Test: The functionality of the system was tested and the outcome is above expectation. Even without proper insulation on the transfer part, the contact temperature on the bottom part (close to the hot section) was found to be below -150 ).
14 LNG markets 1. Transport 2. Alternative fuel, like i.e. the Dutch Green deal
15 LNG bunkering
16 Gas Property Transmitter (GasPT2) It provide the values of natural gas physical properties like; Lower and Upper Calorific Value. Wobbe Index. Density and relative density. Compressibility factor and Methane number. Total air requirement. Comms Connection Insulating Sleeve Processor Board Thermal Conductivity Sensor Spherical Resonator
17 Principle of operation (1) Speed of Sound Correlation Speed of Sound correlates strongly to molecular weight of gas But the Calorific value inference deviate significantly
18 Principle of operation (2) Correlation using Thermal Conductivity Thermal conductivity distinguishes between hydrocarbons and inerts Distinction between inerts (N2 and CO2) is obtained by the CO2 sensor
19 Principle of operation (3) All hydrocarbons typically found in a natural gas can be represented by a mix of effective methane (CH4 ), effective ethane (C2H6 ) and effective propane (C3H8 ) that yield the same number of carbon and hydrogen atoms. 3 measurements are mathematically solved to derive a 4 component pseudo composition consisting of: Methane, Ethane, Propane, Nitrogen (Effective) Plus Carbon Dioxide Examples : 1C4H10 = C2H6 + C3H8 CH4 (1 mol. Butane = 1 mol. Ethane + 1 mol. Propane - 1 mol. Methane) 2C5H12 = 2C2H6 + 3C3H8 3CH4 (2 mols. Pentane = 2 mols. Ethane + 3 mols. Propane 3 mols. Methane) C6H14 = 3C3H8 CH4 C2H6 (1 mol. Hexane = 3 mols. Propane 1 mol. Methane 1 mol. Ethane)
20 Calculation of an inferred gas composition Ref gas CV= MJ/m 3 Inferred Gas CV= MJ/m 3 The method difference= 0,006 MJ/m 3
21 Response E.ON Benelux GasPT2 GC
22 Recent development LNG probe and vaporizer testing skid. According NEN-EN12838: Installations and equipment for liquefied natural gas - Suitability testing of LNG sampling systems. Suitable for (nearly) every LNG sampling system which is currently available. Hooked up to: LNG storage tank LNG liquefier Mid-Scale LNG calibration loop (VSL) Probe/Vaporizer
23 We thank you for your attention.
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