Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
J Hazard Mater. 2021 Feb 15;404(Pt A):124109. doi: 10.1016/j.jhazmat.2020.124109. Epub 2020 Oct 1.
A new process of NO removal from flue gas, using an integrated system of oxidation-absorption-biological reduction (OABR), is introduced. The experimental results show that increasing the NO oxidation ratio in flue gas can effectively improve the NO removal efficiency of the OABR system. The NO removal efficiency could reach 98.8% with 0.02 M NaHCO as the chemical absorbent and under the condition of the optimal NO oxidation ratio of 50%. During stable operation, the OABR system could maintain a high NO removal efficiency (above 94%) under the following conditions: 1-8 vol% (10-8 × 10 ppmv) O, 200-800 ppmv NO, 0.5-1.5 L/min gas flow rate and 100-800 ppmv SO. The nitrogen equilibrium results showed that about 59% of the nitrogen in the inlet NO were transformed to N through microbial denitrification, 37% of the nitrogen were converted to biological nitrogen for microbial growth, and only 1.1% of the nitrogen remained in the liquid phase. This new approach has an excellent NO removal performance and great potential for industrial application.
一种新的烟气脱硝方法，即氧化-吸收-生物还原集成系统（OABR）被提出。实验结果表明，提高烟气中 NO 的氧化率可以有效地提高 OABR 系统的脱硝效率。在最佳 NO 氧化率为 50%时，以 0.02M 的 NaHCO3 作为化学吸收剂，NO 的去除率可达 98.8%。在稳定运行期间，OABR 系统在以下条件下可保持高的 NO 去除效率（>94%）：1-8 vol%（10-8×10 ppmv）O2，200-800 ppmv 的 NO，0.5-1.5 L/min 的气体流速和 100-800 ppmv 的 SO2。氮平衡结果表明，约 59%的入口 NO 中的氮通过微生物反硝化转化为 N，37%的氮转化为微生物生长所需的生物氮，只有 1.1%的氮残留在液相中。这种新方法具有优异的 NO 去除性能，具有很大的工业应用潜力。
