研究报告
马强,朱燕群,何勇,张明慧,林法伟,杨业,王智化.活性分子O3深度氧化结合湿法喷淋脱硝机理试验研究[J].环境科学学报,2016,36(4):1428-1433
活性分子O3深度氧化结合湿法喷淋脱硝机理试验研究
- NOx removal mechanism by O3 oxidization integrated with wet scrubber
- 基金项目：国家重点基础研究发展计划(No.2012CB214906);国家自然科学基金(No.51176169)
- 作者
- 单位
- 马强
- 浙江大学能源工程学院, 杭州 310027
- 朱燕群
- 浙江大学能源工程学院, 杭州 310027
- 何勇
- 浙江大学能源工程学院, 杭州 310027
- 张明慧
- 浙江大学能源工程学院, 杭州 310027
- 林法伟
- 浙江大学能源工程学院, 杭州 310027
- 杨业
- 浙江大学能源工程学院, 杭州 310027
- 王智化
- 浙江大学能源工程学院, 杭州 310027
- 摘要：针对活性分子O3氧化结合湿法喷淋脱硝技术,研究了O3/NOx摩尔比和气相反应温度对NOx脱除效率的影响.试验结果表明,温度是决定臭氧脱硝效率的关键参数.在反应温度为90℃,O3/NO摩尔比大于1.1的条件下,其脱硝效率要明显高于150℃的工况.这是因为在150℃反应温度条件下,臭氧与NOx反应遵循O3+NO=NO2,基本不随O3/NO摩尔比变化而改变;而90℃时,O3/NOx<1.1,O3+NO=NO2为主要反应,O3/NOx>1.1时,臭氧会与NO2进一步发生深度反应,具体反应如下:NO2+O3=NO3+O2,NO2+NO3=N2O5.由于N2O5在水中的溶解度要远高于NO2,故低温氧化结合湿法喷淋技术可实现NOx高效脱除.此外,通过傅里叶红外吸收光谱仪也检测到了N2O5的吸收峰.最后,用离子色谱仪分析了湿法喷淋后液相吸收产物中各阴离子的浓度,发现O3/NOx=1.1工况下的吸收产物主要以NO2-为主,而O3/NOx=2.1时则以NO3-为主,再一次验证了较低温度、O3/NOx摩尔比较高时的氧化产物为N2O5的结论.
- Abstract：Experimental investigation on the NOx removal by ozone oxidization integrated with web scrubber was observed. Special focus was placed on the effects of O3/NOx molar ratio and the gas reaction temperature on NOx removal efficiency. The results showed that oxidation temperature is critical for denitrification efficiency. When O3/NO<em>x molar ratio is greater than 1.1, the denitrification efficiency at reaction temperature 90 ℃ is higher than that of 150 ℃. When the oxidation temperature is at 150 ℃, O3/NOx reaction is followed by O3+NO=NO2, and basically does not change with O3/NO<em>x molar ratio. At 90 ℃ and O3/NOx<1.1, O3+NO=NO2 is the dominant reaction, while as O3/NOx>1.1, ozone and NO2 would react to form NO3+O2 at the beginning, followed by NO2+NO3=N2O5. Since N2O5 is more soluble than NO2, integration with wet spray technology would achieve removal of NOx at low-temperature with higher efficiency. In addition, Fourier Transform Infrared Absorption Spectrometer (FTIAR) also detected N2O5 existence. Finally the concentration of each anion in the liquid absorption after wet scrubber was analyzed by ion chromatography. When O3/NOx=1.1, absorbing liquid product is mainly NO2-, and as O3/NOx=2.1, the product is dominant as NO3-. This confirms that O3/NOx molar ratio is higher with lower oxidation temperature, and the main oxidation product is N2O5.
- Key words：active molecule denitration wet spray mechanism N2O5
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