Performance of piperazine-urea-N-(2-hydroxyethyl) piperazine ternary system on simultaneous desulfurization and denitration

摘要

To overcome the pollution of SO_2 and NO_x in the industrial waste gas, we proposed an absorbent composed of piperazine-urea-N-(2-hydroxyethyl) piperazine ternary system to promote the absorption efficacy. To assess its efficacy, we have measured the performances of simultaneous desulfurization and denitration from N_2-NO-SO_2 simulated flue gas with the ternary system absorbent in a static absorption experiment. Furthermore, the influences of the concentration of N-(2-hydroxyethyl) piperazine, pH value, the concentrations of NO and SO_2 in the initial simulated flue gas and the flow rate of simulated gas on the absorption behavior were discussed systematically. A better simultaneous desulfurization and denitration performance could be obtained under pH value of 5, the concentration of N-(2-hydroxyethyl) piperazine of 0.3 mol/L, the flow rate of 500 mL/min, and the concentrations of NO and SO_2 in the initial simulated flue gas of 1200 mg/m~3 and 2500 mg/m~3, respectively. Under the above-mentioned operating condition, simultaneous NO removal efficiency of 78.92% and SO_2 removal efficiency of 98.20% could be obtained.