Pilot-Scale $\hbox{NO}_{\rm x}$ and $\hbox{SO}_{\rm x}$ Removal From Boiler Emission Using Indirect-Plasma and Chemical Hybrid Process
Pilot-Scale $\hbox{NO}_{\rm x}$ and $\hbox{SO}_{\rm x}$ Removal From Boiler Emission Using Indirect-Plasma and Chemical Hybrid Process
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DOI：
10.1109/tia.2009.2036669
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发表时间：
2010
影响因子：
4.4
通讯作者：
T. Yamamoto;H. Fujishima;M. Okubo;T. Kuroki
中科院分区：
文献类型：
--
作者：
T. Yamamoto;H. Fujishima;M. Okubo;T. Kuroki
采用间接等离子体和化学混合工艺对锅炉排放的NOx和SOx进行了中试同时去除。烟气流速为450 ~ 1470 Nm3/h，烟气温度为280℃，城市燃气燃烧NOx浓度为30 ppm，重油燃烧NOx和SOx浓度分别为70和35 ppm。通过间接等离子体注入自由基被证明对NO氧化非常有效，特别是当烟气温度在300°C范围内时，NOx在该温度下产生。用Na2SO3化学洗涤器将生成的NO2进一步还原为N2和无毒的水溶性Na2SO4。以燃油锅炉为例，NaOH溶液同时吸附SO2。在现有脉冲电源条件下，燃气燃烧的NOx去除率超过90%，而燃油燃烧由于臭氧浓度不足，NOx去除率仅在60%左右。SO2的去除率在85% ~ 90%之间。通过自由基流量与一次烟气流量之比、比能密度、Na2SO3浓度和化学流量对NOx的去除效果进行评价。最后对处理后的水质进行了考察，证明了处理后的水是一次性的。
Pilot-scale simultaneous NOx and SOx removal from boiler emission was performed using an indirect-plasma and chemical hybrid process. The flue-gas flow rate was in the range of 450-1470 Nm3/h, the gas temperature was 280°C, the NOx concentration was 30 ppm for city-gas firing, and both NOx and SOx concentrations were 70 and 35 ppm for heavy-oil firing, respectively. Radical injection by an indirect plasma was demonstrated to be extremely effective for NO oxidation, particularly when the flue-gas temperature is in the range of 300°C where NOx is generated at this temperature. The produced NO2 was further reduced to N2 and nontoxic and water-soluble Na2SO4 by a Na2SO3 chemical scrubber. For the case of oil-firing boiler, SO2 was simultaneously adsorbed by NaOH solution. The NOx removal efficiency for gas firing exceeds 90%, but the NOx removal efficiency for oil firing was in the range of 60% due to the lack of ozone concentration with the present pulse power supply. The removal efficiency of SO2 was in the range of 85%-90%. The NOx removal efficiency was evaluated by the ratio of the radical flow rate to the primary flue-gas flow rate, specific energy density, Na2SO3 concentration and chemical flow rate. Finally, the quality of disposed water was also investigated and proved to be disposable.