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A new method to remove the heat released during hydrate formation Supervisor : Feng Xin Reporter : Xiaofei Song.

Published byPhilip Armstrong Modified over 8 years ago

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Presentation on theme: "A new method to remove the heat released during hydrate formation Supervisor : Feng Xin Reporter : Xiaofei Song."— Presentation transcript:

1 A new method to remove the heat released during hydrate formation Supervisor : Feng Xin Reporter : Xiaofei Song

2 Contents The background of the subject 1 Design for the experiment 2 Estimate for the experiment 3 Thought and plan 4

3 The background Heat transfer Mass transfer Hydration rate ? CH 4 +nH 2 O=CH 4.nH 2 O

4 Several methods to remove heat in the literatures  Air bath or water bath L.-W. Zhang, G.-J. Chen, ∗, C.-Y. Sun, S.-S. Fan,Y.-M. Ding. X.-L.Wang, L.-Y.Yang. The partition coefficients of ethylene between hydrate and vapor for methane+ethylene+water and methane+ethylene+SDS+water. Chemical Engineering Science 60 (2005) 5356 – 5362.  Copper block Kazuya Fukumoto, Jun-ichiro Tobe, Ryo Ohmura, and Yasuhiko H. Mori.Hydrate Formation Using Water Spraying in a Hydrophobic Gas: a Preliminary Study. Yokohama 223-8522, Japan  Thermoelectric module assembly US 2012/0082590 A1  Heat exchanger(in the reactor or outside ) Ryo Ohmura,*,† Shigetoyo Kashiwazaki, Saburo Shiota, Hideyuki Tsuji, and Yasuhiko H. Mori. Structure-I and Structure-H Hydrate Formation Using Water Spraying. Energy & Fuels 2002, 16, 1141-1147  ice

5 The questions existed :  The temperature for hydration is about 0 ℃,if we want to obtain good heat transfer effect,the temperature of condensing medium is about -10 ℃,then water will surely freeze around the pipe,which effect heat transfer eventually.  The circulation volume is big since the heat capacity of the condensing medium is small. The fact: We can not keep the value of temperature constant even if the exchanger have sufficient capacity,thus leading to low hydration rate. Direct heat exchangePhase change material

6 Phase change material(PCM) The advantages compared to the conventional materials:  Require a smaller weight and volume of material for a given amount of energy.  Has the capacity to store heat of fusion at a constant or near constant temperature which correspond to the phase transition temperature of the phase change material. Tetradecane Hexadecane Melting point 5.8 ℃ 18.1 ℃ Heat of fusion 45.07kJ/mol 51.3kJ/mol Heat released during hydration:54.2kJ/mol gas(methane)

7 He Bo *, E. Mari Gustafsson, Fredrik Setterwall. Tetradecane and hexadecane binary mixtures as phase change materials (PCMs) for cool storage in district cooling Systems.Energy 24 (1999) 1015–1028

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9 Table 1.The consumption of emulsion of different weight percentage when a mole methane is consumpted. The weight percentage of tetradecane(%) the weight of emusion needed(kg) The weight of tetradecane needed(kg) The mole quantities of water needed(mol) 201.03480.207045.9931 250.85540.213835.6410 300.72900.218728.3488 350.63510.222322.9344 400.56270.225118.7553 450.50500.227315.4320 500.45810.229112.7261 550.41920.230610.4801 600.38640.23188.5859 650.35830.23296.9669 700.33400.23385.5673 750.31280.23464.3451 800.29420.23543.2688

10 The weight percentage of tetradecane(%) Rate of methane consumption(mol/h) Rate of emulsion consumption(kg/h) 200.0818763450.001412156 250.0976247840.001391779 300.1129252050.001371982 350.127796460.001352741 400.1422563530.001334031 450.1563217220.001315832 500.1700084950.001298123 550.1833317550.001280885 600.1963057950.001264098 650.2089441660.001247745 700.221259730.00123181 750.2332646980.001216277 800.2449706740.001201131 Table2.The consumption of methane and emulsion when the effective volume of the reactor is 15mL. 0.04 mol/h

11 If a methane cylinder is 40L,and the density is 1g/mL,then the using time of a methane cylinder is as follow. The weight percentage of tetradecane(%) The using time of a methane cylinder(h) The using time of a methane cylinder(days) 20 30533.8 1272.2 25 25608.3 1067.0 30 22138.5 922.4 35 19562.4 815.1 40 17573.9 732.2 45 15992.7 666.4 50 14705.1 612.7 55 13636.5 568.2 60 12735.2 530.6 65 11964.9 498.5 70 11298.9 470.8 75 10717.4 446.6 80 10205.3 425.2 Table 3.the using time of a methane cylinder

12 The weight percentage of tetradecane(%) The power of the heat exchanger (for gas)(w) The power of the heat exchanger(for emulsion)(w) 200.03184.4609 250.13644.5713 300.15774.6786 350.17854.7829 400.19874.8843 450.21844.9829 500.23755.0789 550.25615.1724 600.27425.2634 650.29195.3520 700.30915.4384 750.32585.5225 800.34225.6046 Table 4.The power of the heat exchanger

13 The weight percentage of tetradecane(%) Heat transfer area needed(for gas)(m 2 ) Heat transfer area needed(for emulsion （ m 2 ） 201.059E-050.001439 254.545E-050.001475 305.258E-050.001509 355.950E-050.001543 406.623E-050.001576 457.278E-050.001607 507.916E-050.001638 558.536E-050.001669 609.140E-050.001698 659.728E-050.001726 700.00010300.001754 750.00010860.001781 800.00011410.001808 Table 5.heat transfer area of the heat exchangers

14 plans  Find an appropriate approch to prepare the desirable emulsion. stable do not exist or exist small undercooling do not plug in the heat changer and pipes  Think about details of the experiment goal variable improve technological process

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