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5.5 CO2 removal tests 75 it through two test tubes containing silica gel and NaOH respectively. The difference was also measured using Kitagawa gas detector tubes (tube no.126B, 100-1500ppm range). These contain alumina and NaOH with a pH sensitive indicator. The results are shown in Table 5.5. This method gave the most consistent results obtained for the various sampling methods tried and was used for all subsequent testing. Table 5.5 Sequential sampling method results for measuring difference in CO2 concentration. ~C02 Kitagawa ~C02 mass spectrometer 220±50ppm 224±45ppm 5.5.2.3 Variation of CO2 concentration in bottled dry air The bottled dry air (BOC Gases) acquired for MHE testing was sampled prior to each test to determine its CO2 content. Two interesting results were obtained. First, the CO2 concentration of each bottle was different, varying from 210-410 ppm. Second; the first two tests for CO2removal on the complete rig showed the inlet concentration of CO2to rise suddenly as the gas bottle became almost empty. The day after the second test run the residual content of the gas bottle used was sampled and found to contain 1100ppm of CO2, The appearance of high concentration of CO2 at reduced bottle pressure and when the bottle temperature has increased (equilibrated with room temperature) m that this is due to adsorption of CO2 on surfaces inside the cylinder. 5.5.3 easured CO2 removal The discussion in the previous section outlines the problems encountered in trying to measure trace amounts of CO2in air samples. An example of actual test data collected is shown in Figure 5.15. Note how rapidly and well the Ar peak stabilizes by comparison to the CO2peak. Sampling sequence is background-outlet-inlet-background. Figure 5.16 shows more closely the peak heights for inlet and outlet CO2and Ar for one sample. In these readings alone a ±5% error in the Ar peak height could mean up to a ±50% error in the calculated CO2concentration difference between inlet and outlet. The only method left available to minimise errors in the readings was to take as many readings as possible and calculate mean results. The number of samples which may be read is limited by the time taken for readings to stabilize and to return to whatever is considered a reasonable background in the sampling sequence. For these tests each sample took about 15 minutes, allowing 6 samples per bottle. The time chosen forPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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