220 likes | 512 Views
MAE 435 – Final Presentation Advisor: Dr. Zhang Liebherr representative: James Whitfield - Albert Ochagavia - Pithan Rojanavongse -Josh Harris - J ohn Alexander. Liquefied Natural Gas Fuel tank. LNG Background. What is LNG? Liquefied Natural Gas -162 ° C 1/600 volume of Natural Gas
E N D
MAE 435 – Final Presentation Advisor: Dr. Zhang Liebherr representative: James Whitfield -Albert Ochagavia -PithanRojanavongse -Josh Harris -John Alexander Liquefied Natural Gas Fuel tank
LNG Background • What is LNG? • Liquefied Natural Gas • -162° C • 1/600 volume of Natural Gas • Why use it? • Cost • Availability • Efficiency • Environment
Project Statement • To design and analyze a Liquid Natural Gas (LNG) fuel tank for Liebherr’s current T 264 mining truck that conforms to all Pressure Vessel and LNG regulations and fits in the space available on the mining vehicle.
Project Goals • Design LNG Tank to fit Liebherr’s current T 264 Mining Truck • Maximize Volume for 8-12 hour operational time (35% work load) • Strictly follow pressure vessel and LNG standard regulations • Perform a Finite Elemental Analysis of the tank using SolidWorks
Tank Design Parameters • Space Available • Assumptions • Load factor of 35% • LNG engine efficiency equivalent to Diesel • ASTM Boiler and Pressure Vessel Code • Same tank design will be used for both tanks
Inner Tank • A240 Type 304 Stainless Steel • Total volume: 1800 L • Thickness: 1.75 inches • 2 parts (Shielded Metal Arc Welding Method)
Ullage Tank • Volume: 180 L • Increases hold time • Pump less fuel method • Full tank gauge • Rivets • Diameter: 2.5 inches • Length: 3 inches • Vertical and horizontal support
Insulation Layer • Multi Layer Insulator (MLI) • 1 inch thickness • Low thermal conductivity • K= 0.0001 W/m-k • High thermal resistance • R=1440 m^2K/W
Outer Shell • A240 Type 304 Stainless Steel • Made of 2 parts • Shielded Metal Arc Welding Method • Allows vacuum • Placement for rivets at the bottom
Gauges • Three Companies: Omega, Ashcroft, and WIKA • Two Gauges: • Fuel • Standard Size: ~ 2” • Pressure • Maximum tank pressure: 420 psi • Average Size: 1 – 2 ½” • Properties: • High pressure • High shock resistant • Cryogenic temperatures (304 SS)
Standard Diameter: 1 ½ “ Time efficient Prevention of temperature and pressure changes Function at cryogenic temperatures and atmospheric pressure 50 Gallons Per Minute Material: Stainless Steel The majority of companies are developing similar fueling methods Quick disconnect and fueling Parker, CryoMac, Carter, etc. 50 gallons per minute Stainless steel Fueling Methods
Three Major Components • Vent • Removing warmer gas • Sub-cooling LNG residual • Decrease in pressure • LNG facilities may have a vent connection • Liquid • For defueling tank (emergency situations) • Relief Valves • Reduces pressure • Safety feature
Rules & Regulations • NFPA 57 – Liquefied Natural Gas Vehicular Fuel Systems Code • Design, installation, operation, and maintenance of LNG engine fuel systems on vehicles of all types • SAE J2343 – Recommended Practice for LNG Medium and Heavy-Duty Powered Vehicles • Guidance for construction, operation, and maintenance of LNG heavy-duty vehicles for public transit and commercial applications
Safety Features • Ullage Tank • Pressure Relief Valves • 350 psi • 400 psi • Emergency Shutoff Valves • Defueling connection
Finite Element Analysis • Weight Analysis (4000 lbs) • Yielding stress 207 MPa (304 SS) • Max stress from FEA 22 MPa
Finite Elemant Analysis • Pressure (420 psi) • Yielding stress 207 MPa (304 SS) • Max stress from FEA 190 MPa
Goals (2) • Design a single LNG Tank to fit Liebherr’s current T 264 Mining Truck Designed a tank that fits and has an approximate volume of 1800 L • Maximize Volume for 8-12 hour operational time (35% work load) Total of 3500 L = 11-12 hour of operation time • Strictly follow pressure vessel and LNG standard regulations NFPA 57 SAE J2343 • Perform a Finite Elemental Analysis of the tank using SolidWorks Max stress < yielding stress for 304 stainless steel (207 Mpa)