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    Numerical investigation of the effect of constant velocity and constant residence time scaling criteria on the natural gas mild combustion
    (2019-01-01)
    Suksam, Niwat
    ;
    Charoensuk, Jarruwat
    This paper concerns with effect of scaling on performance of MILD combustor when increasing its geometry and thermal throughput from the 0.58 MW prototype to its scaled-up versions of 5.8 MW. The constant velocity (CV) and constant residence time (CRT) scaling approaches were used in this work. Their performances were simulated with a numerical model for MILD combustion which was thoroughly validated against existing experimental data. It was found that despite MILD condition could be successfully maintained with both scaling approaches up to the scaling factor of 10, the effect of CV scaling could lead to elevated NO<inf>x</inf> emission due to increase in flow retention time in hot environment. The results were also discussed in term of Damköhler number. Despite of promising technology of MILD combustion for low-NO<inf>x</inf> emission, care must be taken on NO<inf>x</inf> emission level when scaling up with large scale factor under the CV criteria. As for the CRT criteria with increasing inlet velocity with the scale factor, the fuel and air supply pressure should be considered as a constrain when scaling up with large scale factor.
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    Arsenic removal from natural gas condensate using a pulsed sieve plate column and mass transfer efficiency
    (2012-02-01)
    Chaturabul, Srestha
    ;
    Wannachod, Pharannalak
    ;
    Rojanasiraprapa, Bongkotch
    ;
    Summakasipong, Supat
    ;
    Lothongkum, Anchaleeporn W.
    This work applied a pulsed sieve plate column in conjunction with liquid-liquid extraction technique to remove arsenic from natural gas condensate. The relevant parameters, that is the type and concentration of the extractant, pulse velocity, volumetric-flow rate ratio of the condensate to the extractant, operating time, and extraction cycle were investigated. Mass transfer efficiency in terms of the overall height of transfer unit (HTU <inf>oy</inf>cm) and the interfacial area (m <sup>2</sup>/m <sup>3</sup>) were calculated. The highest percentage of arsenic removal in this study was 94% corresponding to the calculated HTU <inf>oy</inf> of 26 cm and the calculated interfacial area of 118 m <sup>2</sup>/m <sup>3</sup> at the optimum conditions: the mixture of the extractant (1 M hydrochloric acid and 20% (v/v) methanol), pulse velocity of 20 mm/s, and volumetric-flow rate ratio of the condensate to the extractant of 1:4. By using continuous operation in the cycle mode, the percentages of arsenic removal were observed at 94, 85, and 80 from the respective 1st, 2nd, and 3rd cycles. The operation was based on the condition that fresh feed was introduced in each cycle while the extractant was reused. © Taylor and Francis Group, LLC.