OCR Text |
Show Table 8. Effectiveness of NO Absorption in NaCl02 caustic Aqueous Scrubbing Phase Item Expt #1 Expt . #2 Expt #3 Gas Conc. of NO 1,950 ppm 1,925 ppm 2,075 ppm Flow rate 1 l/min 1 l/min 1 l/min Break through 104 min 105 min 100 min moles of NO 0.0083 0.0083 0.0085 Liquid Conc of NaCl02 0.0080 0.0080 0.0080 Conc of Na2co3 0.0015 0.0015 0.0015 Conc of Na 2so4 0.00038 0.00038 0.00038 conc. of NaOH 0.00097 0.00097 0.00097 Volume 1 liter 1 liter 1 liter pH before 11.27 11.27 11.27 pH after 1.69 1.75 1.73 Conc. of N~3 - 510 ppm 520 ppm 510 ppm Mole of CI 0.0083 0.0086 0.0087 Mole a! N03 - 0.00823 0.00839 0.00823 N°LN03 _ 1.01 0.99 1.03 CI / Cl~2 1.03 1.05 1.03 NO/ClO2 1.04 1.04 1.06 OXYGEN EFFECT ON NO ABSORPTION IN NaC102 AQUEOUS SCRUBBING When flue gas containing 02 is bubbled through a NaCl0 2 containing scrubber, NaCI02 may react with 02. In order to determine whether effect has any impact on NO absorption, several runs were made with a gas mixture containing 5% 02. Table 9. shows th~t the eff7ctiveness of NO remova~ by NaCl02 decreased when 02 1S present 1n the flue gas (NO/CI02 drops to 0.84). Table 9. Oxygen Effect on NO Absorption in NaCl02 Scrubbing Phase Item Gas Conc. of NO Flow rate Break through Mole of NO Liquid Conc of NaCI02 Conc of Na2C03 Conc of Na2S04 volume mole of_CI02- NO/Cl02 Expt #1 1,883 ppm 1 l/min 84min 0,0065 0.008 0.0015 0.00038 1 liter 0.008 0.81 Expt #2 1,841 ppm 1 l/min 90 min 0.0068 0.008 0.0015 0.00038 1 liter 0.008 0.85 Expt #3 1,883 ppm 1 l/min 90 min 0.0069 0.008 0.0015 0.00038 1 liter 0.008 0.86 pH EFFECFT ON NO ABSORPTION IN NaC102 AQUEOUS SCRUBBING 11 |