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| Experimental study on residual ozone decomposition in process of multi-pollutants removal by ozone |
| LIN Fa-wei, ZHU Yan-qun, XU Chao-qun, MA Qiang, WANG Zhi-hua, ZHOU Jun-hu, CEN Ke-fa |
| State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China |
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Abstract The observation of residual ozone decomposition with the purpose of near-zero gas emission was conducted during the process of simultaneous multi-pollutants removal by ozone. A 300 MW boiler flue gas conditions were simulated. The effects of bath temperature, spray temperature, additives species and concentration of additives were attentively employed to conduct the residual ozone decomposition. The increase of bath temperature and spray temperature can improve the residual ozone decomposition. The residual ozone decomposition can be obviously promoted in spray tower when the spray liquid containing reductive substances. Concentration of additive had a positive effect on ozone decomposition. Compound additive （CaSO3+(NH4)2SO4 or Na2SO3+NaNO2） achieved the highest decomposition among them. The ozone emission at the exit was 0.03×10-6～0.04×10-6, which could satisfy the national emission limit of 0.047×10-6．
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Published: 10 September 2015
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臭氧多脱过程中残留臭氧的分解试验研究
为了实现臭氧氧化多种污染物协同脱除反应后残留臭氧的近零排放,通过实验室模拟某300 MW锅炉烟气臭氧多脱条件,开展残余臭氧的分解试验研究。研究不同水浴温度、喷淋温度、添加剂种类、添加剂浓度等关键参数对脱硫塔及烟囱尾部烟道中残余臭氧分解特性的影响. 试验结果表明,水浴温度和喷淋温度越高,残余臭氧的分解效果越好；喷淋液中加入还原性物质对残余臭氧的分解有很明显的促进作用；添加剂浓度在一定程度上影响残余臭氧的分解效果. 使用CaSO3+（NH4)2SO4或Na2SO3+NaNO2复合型添加剂最终实现超低残余臭氧排放体积分数为0.03×10-6～0.04×10-6,满足了国家环境空气质量标准0.047×10-6.
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