tailieunhanh - Gas Turbines Part 5

Tham khảo tài liệu 'gas turbines part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Development of Granular Catalysts and Natural Gas Combustion Technology for Small Gas Turbine Power Plants 89 The temperature cycle mode consisted of four cycles of gas combustion catalyst cooling and repeated start of the combustion process. The combustion process was carried out at GHSV 15 000 h-1 and inlet temperature 580-600 C. The value of a was maintained at . The height of the catalytic package was 300 mm. The dynamics of changes in the activity of different catalysts are presented in Fig. 4. Time on stream h Fig. 4. Methane conversion vs. operation time in CCC at GHSV 14 900-15 100 h-1 and a . Uniform catalyst package loaded with 1 Mn-Al2O3 Tin - 600 C 2 Mn-La-Al2O3 Tin - 600 C 3 Pd-Mn-La-Al2O3 Tin - 575-580 C . The data presented in Fig. 4 indicate that the catalysts Mn-Al2O3 Mn-La-Al2O3 and Pd-Mn-La-Al2O3 differ both by their activity and stability. For example the activity of the Mn-Al2O3 catalyst gradually decreased as evidenced by gradual increase of the methane and CO concentration at the CCC outlet. The methane conversion decreased from to during the first 50-54 h on stream. Then the catalyst activity stabilized and did not change in the following 80 h on stream Fig. 4 curve 1 . At the end of the experiment the methane and CO concentrations stabilized at 330 and 110 ppm respectively Table 6 . Table 6 compares the outlet temperatures and emissions of CH4 and CO during natural gas combustion over Mn-Al2O3 catalysts with different fractional compositions at GHSV 850015 000 was shown that the methane combustion efficiency over large catalyst granules with the external ring diameter 15mm was low. Even at a low load on the catalyst GHSV 8500 h-1 the methane conversion was 97 whereas the methane and CO emissions at the outlet were 500 and 300 ppm respectively. Note that under similar CCC operation conditions the application of catalyst granules with the external diameter mm allowed for a 10-fold decrease of the methane .

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