Liquefied natural gas submerged combustion vaporization facilities: process integration with power conversion units

2011 ◽  
Vol 37 (1) ◽  
pp. 80-92 ◽  
Author(s):  
Giulio Tagliafico ◽  
Federico Valsuani ◽  
Luca A. Tagliafico
Keyword(s):  
Natural Gas ◽  
Process Integration ◽  
Power Conversion ◽  
Liquefied Natural Gas ◽  
Submerged Combustion

scholarly journals Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4084
Author(s):  
Lorenzo Bongini ◽  
Rosa Anna Mastromauro ◽  
Daniele Sgrò ◽  
Fabrizio Malvaldi
Keyword(s):  
Sensitivity Analysis ◽  
Control System ◽  
Natural Gas ◽  
Experimental Validation ◽  
Power Conversion ◽  
Liquefied Natural Gas ◽  
Fine Tuning ◽  
Simulation Platform ◽  
Electrical Damping ◽  
Conversion Stage

Liquefied Natural Gas (LNG) plants are commonly island-operated weak grids where the interaction of high-power Variable Frequency Drives (VFDs) with the Turbine-Generator (TG) units might cause Sub-Synchronous Torsional Interaction (SSTI) phenomena. SSTI phenomena can lead the LNG plant to instability conditions. Each LNG plant configuration is characterized by a risk level, which is considered high when the electrical damping at the TG Torsional Natural Frequencies (TNFs) is negative. Starting from a real case study, a detailed electromechanical model of an LNG plant is presented. The model is comprehensive of the control system of the power conversion stage and of the TG unit. Sensitivity analysis, performed on control system parameters, allows one to detect the parameters that impact the electrical damping and the stability of the overall LNG plant. A complete simulation platform is developed. Experimental results are carried out on a real LNG plant considering four different configurations. The theoretical model and the simulation platform allow one to estimate the electrical damping and the results are confirmed by the experimental validation. It is demonstrated that fine tuning of the power conversion stage control parameters can reduce the risk related to torsional instability.

Numerical Simulation of Heat Transfer of Liquefied Natural Gas in Horizontal Circular Tubes under Supercritical Pressure

2014 ◽  
Vol 960-961 ◽  
pp. 438-441 ◽  
Author(s):  
Hai Yu Meng ◽  
Shu Zhong Wang ◽  
Lu Zhou ◽  
Zhi Qiang Wu ◽  
Jun Zhao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Natural Gas ◽  
Numerical Simulations ◽  
Supercritical Pressure ◽  
Liquefied Natural Gas ◽  
Design Parameters ◽  
Circular Tubes ◽  
Submerged Combustion

The submerged combustion vaporizer (SCV) is a kind of equipment used for liquefied natural gas (LNG) vaporization. In order to get insights into the heat transfer of supercritical LNG, numerical simulations were carried out in this paper for investigating heat transfer of LNG in horizontal circular tubes under supercritical pressure. Numerical results showed that LNG temperature at the outlet under the design parameters was 276 K which met the demands of application. The velocity of LNG at the outlet was 12 m/s, and the pressure drop along the ducts was 120 kPa.

Parametric Study of a Horizontal Tube Heat Exchanger for LNG Submerged Combustion Vaporiser

2014 ◽  
Vol 700 ◽  
pp. 667-677
Author(s):  
Qing Li ◽  
Zhi Yin Duan ◽  
Qing Yu Wang ◽  
Rong Liu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Natural Gas ◽  
Computer Model ◽  
Parametric Study ◽  
Single Phase ◽  
Horizontal Tube ◽  
Liquefied Natural Gas ◽  
Tube Heat Exchanger ◽  
Submerged Combustion

LNG (Liquefied Natural Gas) submerged combustion vaporiser is applied to convert Liquefied natural gas to gas phase natural gas through using the hot combustion gas generated from submerged combustion. This paper investigated the vaporisation and heat transfer process of a single horizontal tube, a simplified model, to simulate the heat transfer of circular tube heat exchanger used in LNG submerged combustion vaporiser. This work provides a useful computer model for the design of heat exchanger used in LNG submerged combustion vaporiser. The overall heat transfer and vaporisation process of the tube was separated into single-phase liquid, two-phase mixture and single-phase vapour heat transfer regions for calculation and analysis. Through development of a dedicated computer model, a parametric study was carried out to analyse the effects of geometrical size and operating conditions on inner surface convective heat transfer of tube. The results of study suggested that the preferable tube surface temperature for design was found between 280 K and 288 K in order to avoid frost deposition. The minimum tube length required for the overall vaporisation is predicted to be about 16 m when the inner tube diameter set between 0.24 m and 0.28 m.

Liquefied natural gas in China

2000 ◽  
Author(s):  
Dean Girdis ◽  
Stratos Tavoulareas ◽  
Ray Tomkins
Keyword(s):  
Natural Gas ◽  
Liquefied Natural Gas
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