OCR Text |
Show (3) Specification of NOx reduction system The specification of the NOx reduction system is, as follows: • Volume of exhaust gas .•. maximum 80,000 Nm3/H (wet) • Inlet NOx concentration ... maximum 200 ppm (conversion by 02 12%, average of one hr) • Denitrification ratio more than 35% • Ammonia gas concentration at outlet of catalytic reactor .. below 10 ppm • Catalys t ... Ti02-V20S system honeycom type • Shape of catalyst .•. 1500 x 500 4-3) Efficiency of catalyst (1) Laboratory catalyst efficiency Fig. 4-1 shows the test results of the fresh catalyst in the laboratory. From Fig. 4-2, it can be seen that the deni t ~ : fication ratio of about 39% can be achieved at mo~ e ratio of 0.4, temperature of 270°C and SV value of 4630 (l/H) of this design. (2) Efficiency in actual plant Fig. 4-3 shows the results of the initial efficiency test. 1. Denitrification ratio From Fig. 4-3 it can be seen that the efficiency satisfies the specification with which the denitrification ratio of about 39% can be achieved at mole ratio of 0.4, temperature of - 8 - |