Department of Civil Engineering & Architecture, Northeast Petroleum University, Daqing, China.
PLoS One. 2018 Apr 18;13(4):e0192324. doi: 10.1371/journal.pone.0192324. eCollection 2018.
H2O2 was adopted to oxidize NO in simulated flue gas at 100-500°C. The effects of the H2O2 evaporation conditions, gas temperature, initial NO concentration, H2O2 concentration, and H2O2:NO molar ratio on the oxidation efficiency of NO were investigated. The reason for the narrow NO oxidation temperature range near 500°C was determined. The NO oxidation products were analyzed. The removal of NOx using NaOH solution at a moderate oxidation ratio was studied. It was proven that rapid evaporation of the H2O2 solution was critical to increase the NO oxidation efficiency and broaden the oxidation temperature range. the NO oxidation efficiency was above 50% at 300-500°C by contacting the outlet of the syringe needle and the stainless-steel gas pipe together to spread H2O2 solution into a thin film on the surface of the stainless-steel gas pipe, which greatly accelerated the evaporation of H2O2. The NO oxidation efficiency and the NO oxidation rate increased with increasing initial NO concentration. This method was more effective for the oxidation of NO at high concentrations. H2O2 solution with a concentration higher than 15% was more efficient in oxidizing NO. High temperatures decreased the influence of the H2O2 concentration on the NO oxidation efficiency. The oxidation efficiency of NO increased with an increase in the H2O2:NO molar ratio, but the ratio of H2O2 to oxidized NO decreased. Over 80% of the NO oxidation product was NO2, which indicated that the oxidation ratio of NO did not need to be very high. An 86.7% NO removal efficiency was obtained at an oxidation ratio of only 53.8% when combined with alkali absorption.
采用 H2O2 氧化模拟烟气中的 NO，温度为 100-500°C。考察了 H2O2 蒸发条件、气体温度、初始 NO 浓度、H2O2 浓度、H2O2:NO 摩尔比对 NO 氧化效率的影响，确定了 500°C 附近 NO 氧化温度范围较窄的原因，分析了 NO 氧化产物，研究了采用 NaOH 溶液在中等氧化比下脱除 NOx。结果表明，H2O2 溶液的快速蒸发对于提高 NO 氧化效率和拓宽氧化温度范围至关重要。通过将注射器针头的出口与不锈钢气管接触，将 H2O2 溶液扩散成不锈钢气管表面的薄膜，可以使 NO 氧化效率在 300-500°C 时高于 50%，大大加快了 H2O2 的蒸发速度。NO 氧化效率和 NO 氧化速率随初始 NO 浓度的增加而增加。该方法对于高浓度 NO 的氧化更为有效。浓度高于 15%的 H2O2 溶液在氧化 NO 方面更有效。高温降低了 H2O2 浓度对 NO 氧化效率的影响。随着 H2O2:NO 摩尔比的增加，NO 氧化效率增加，但 H2O2 与氧化的 NO 的比例降低。超过 80%的 NO 氧化产物为 NO2，表明 NO 的氧化比不需要非常高。当与碱吸收结合使用时，氧化比仅为 53.8%时，NO 的去除效率达到 86.7%。
