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摘要: 通过中试实验,研究了钠碱法吸收SO2的过程及其不同条件下膜电解循环再生脱硫废液。结果表明,电流密度和吸收液浓度对再生效果影响较大,高电流密度时的中间室硫转化率高、电导率下降速率快,而低电流密度时的中间室电流效率则稍大;高电流密度时的阴极室pH值和电导率上升速率大于低电流密度时的上升速率,并在电解一定时间后上升速率突然加大。低浓度时中间室电流效率高、硫转化率大且电导率下降速率快;低浓度时阴极室pH值和电导率上升速率要大于高浓度时的上升速率,且在电解一定时间后上升速率突然加大。Abstract: A flue gas desulfurization process with the sodium alkali desulfurization and membrane electrolysis recycling was studied in a pilot plant .The results indicate that the current density and absorbing solution concentration can observably impact the membrane electrolysis recycling.The sulfur conversion in the middle cell is higher and the decreasing velocity of conductivity is fast with the higher current density but the current efficiency is higher with the lower current density.The increasing velocity of pH and conductivity in the cathode cell with the higher current density is greater than that with the lower current density, and the pH and conductivity in the cathode cell appear an abrupt rise after 85min during the membrane electrolysis with the higher current density of 83.33mA·cm-2. The current efficiency and sulfur conversion in the middle cell are higher and the decreasing velocity of conductivity is fast with the lower absorbing solution concentration.However, the increasing velocity of pH and conductivity in the cathode cell with the lower absorbing solution concentration is greater than that with the higher absorbing solution concentration, and it also has a abrupt rise after some time during the membrane electrolysis.
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Key words:
- sodium alkali /
- flue gas desulfurization /
- membrane electrolysis /
- current density /
- conductivity /
- pH
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