mechanical integrity of PFHE in LNG liquefaction process
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1 mechanical integrity of PFHE in LNG liquefaction process Norbert Ligterink, Svetlana Hageraats, Han Velthuis Fluid Dynamics Group, TNO, Delft, The Netherlands temperature, boiling flow, thermal stresses 0
2 component mixtures vapor pressure multiphase flow* boiling flows heat exchange* flow pulsations* mechanical integrity* thermal stresses multi-domain simulation problem * core expertise of the Fluid Dynamics group at TNO in Delft knowledge investment programme at TNO, to cover all aspects of boiling heat exchanger 1
3 NG feed 50 bar 300K light components mixed refrigerant (MR) 45 bar heavy MR multiple streams: NG, MR different pressures 4 bar heavy/light fractions MR boiling flow heavy/light fractions NG heavy fractions 2 bar LNG 110K cold box 5 bar stable through hot-end up boiling flow Generic LNG liquefaction in PFHE 2
4 temperature [K] rarefaction boiling plateau natural gas refrigerant dense gas/liquid iterative solution stationary operation ideal gas mixture Raoult s law mainly propane/ethane distance matched mass/heat flow simulation of the heat flows, with fixed composition 3
5 Heat transfer: conductivity Fluid: limited effects in bulk, boundary effects important Wall: complex processes, flow related, boiling Aluminum: plate, fin, and axial losses Heat transfer: capacity Fluid: latent heat of boiling, effect of gas density 4
6 nucleating boiling ( T 10 20K, avoid film boiling) low pressure P < P c for boiling flow (Mostinski rule) homogenous flow and fluid temperature (no cracks or corners) 5
7 various forms of instabilities in boiling heating up through limited heat flux film boiling convection through large local temperature gradients motion of the boiling regime bubbles pushing liquid up boiling in fractures boiling of stagnant refrigerant from nucleation, with noise, via cavitation, possible with film flow or convection cells, to bubble and slug flows 6
8 Mechanical model, unit cell Brazing material as well as the material of the total structure is aluminum alloy There is no prestress at the brazing regions Mechanical properties do not depend on temperature 7
9 Effective mechanical properties In order to calculate effective properties of the PFHE, a series of test problems (uniaxial tension and simple shear) have been solved, as well as a set of equations from the mechanics of composites The calculated mechanical properties of the effective orthotropic material are: E x = Pa G xy = Pa ν xy = 0.23 E y = Pa G yz = Pa ν yz = 0.13 E z = Pa G zx = Pa ν zx = 0.33 (1) 8
10 Temperature and heat flux profiles in solid part case 1: Hot-Cold-Hot-Cold (T hot = 53C, h hot = 1000W/m 2 C, P hot = 50bar) case 2: Cold-Cold-Hot-Hot (T cold = 73C, h cold = 4000W/m 2 C, P cold = 5bar) (2) 9
11 Local stresses with and without internal pressures Case Hot-Cold-Hot-Cold Case Cold-Cold-Hot-Hot 10
12 Calculation of global deformations 11
13 Stress dependencies on design parameters 12
14 design and operational margins use small channels: higher pressure, but more area, more stable avoid sharp corners in design: no local film boiling mean temperature gradient smaller than maximum gradients hot-end up: stable shutdown lower mass flow or increase pressure to avoid film boiling mixed refrigerant (i.e. less volatile components) soften boiling 13
15 Conclusions Complete simulation of LNG liquefaction process Temperature profile and stationary operational conditions for the PFHE have been derived. Stationary thermal stresses substantial (for constant operation) Effective mechanical properties have been calculated Geometry of the PFHE can be now optimized to avoid stress concentrations in the brazing region 14
16 Outlook and invitation Boiling oscillations yield thermal variations and cyclic stresses Fatigue due to cyclic stresses likely with current stress levels and locations Variation in design and operation can be treated with the current model, including prestress and manufacturing imperfections Looking for industrial partners in validation and optimization phase of the research 15
17 temperature profiles indicating different conditions T NG ideal process high NG flow DT T R high refrigerant flow rarefaction (decreased heat flux) refrigerant boiling film boiling 16
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