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50 Chapter 4 Apparatus design and development for the purposes of cool-down, as one larger heat exchanger. Since the heat transfer duty has been approximately doubled, it was expected that the accompanying decrease in effectiveness of the cold end heat exchanger, or C02-MHE, would cause the warm end heat exchanger, or H20-MHE, to cool down. It was found that this did happen and that the reduction in effectiveness of the cold end heat exchanger was of the order of 10%. However complete cool-down to the desired temperatures was not achieved because this process was very slow. A new gas flow circuit was added to aid the cool-down of the H20-MHE. A T- junction was established in the line carrying boil-off vapour from the guard vessel to the radiation shield. A pipe from this T-junction leads through a lift check valve (Nupro SS- 58S8) to the cold fluid inlet of the H20-MHE. Plugging the boil-off vent of the guard vessel causes gas from the guard vessel to flow through this new circuit into the cold fluid inlet of the H20-MHE. Gaseous N2 is bubbled through the LN2 in the guard vessel. The resulting cold N2 gas flows into the H20-MHE. This circuit is shown in Figure 4.2. By adjusting the flow rate of gaseous nitrogen in the new cool-down circuit relative to the flow rate in the MHE's the desired cold end inlet temperature for the H20-MHE can be obtained. When the guard vessel boil-off vent is unplugged the pressure of the working fluid keeps the lift check valve closed. This new circuit allowed the H20-MHE to be cooled much faster. 4.2 Gas analysis using a mass spectrometer A Spectramass dataquad DAQ200/DXS quadrupole mass spectrometer was used for continuous monitoring of CO2and H20 concentration in the process air stream. The set-up of the mass spectrometer! is described in this section. A variable throughput continuous sampling system was devised for introducing gas samples to the mass spectrometer. The design o f this sampling system is described. A schematic layout o f the mass spectrometer and associated equipment is shown in Figure 4.3. The actual layout is shown in Plate 4.4. The Dataquad mass spectrometer has an RS232 interface. This has been used to down load data while testing. The program for data transfer is listed in appendix C. ! Two 1800 deflection mass spectrometers were available in the Engineering Faculty CAEI Mimimass, AEI MSI0), but on setting up were found to produce shifted background spectra. This was ascribed to gradual demagnetization or variation of field strength in the permanent magnets. Attempts at re-magnetizing them were unsuccessful. The Dataquad quadrupole mass spectrometer was therefore purchased.PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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