臭氧氧化协同半干法同时脱硫脱硝在烧结机烟气工业的应用

Application study on simultaneous removal of NOx and SO2 by ozonation combined with semi-dry process in sintering machine flue gas industry

关键词:  臭氧氧化  半干法  脱硝  脱硫

Key words:  ozonation  semi-dry process  denitration  desulfurization

摘要:

以70×10⁴ m³/h烧结烟气为例,研究了工程实际应用中O₃对烟气的氧化和半干法对NO_x的吸收等问题。试验结果表明,O₃与烟气中NO的反应速率快。O₃氧化的关键因素是提高O₃在烟道内的分布,增加O₃的利用率。温度对半干法吸收NO_x有显著影响。随着脱硫塔温度的升高,NO_x的吸收效率持续降低,当温度高于95 ℃时,脱硝效率为0。通过增加消石灰量和增加O₃用量可提高脱硝效率。从工艺运行情况来看,该工艺脱硝成本不高,值得进一步推广应用。 

Abstract:

Taking 700×10³ m³/h sintering flue gas as an example, the ozone oxidation and absorption of NO_x by semi-dry method in practical engineering application was studied. The results showed that the reaction of ozone and NO in flue gas was very fast. The key factor of ozonation was to improve the distribution of ozone in flue and increase the utilization rate of ozone. The reaction temperature had significant effect on the absorption of NO_x. With the increase of temperature in desulfurization tower, the absorption efficiency of NO_x decreased continuously. When the temperature was higher than 95 ℃, the denitration efficiency was dropped to 0. However,the denitration efficiency could be improved by increasing the amount of lime and ozone. From the operation of the process, the cost of denitration was not high. The process is worthy to be popularized and applied.