黄磷复合矿浆脱除烟气NO_x的研究

发布时间：2018-06-11 14:02

  本文选题：烟道气 + 脱硝　； 参考：《昆明理工大学》2017年硕士论文

【摘要】：随着人口的不断增长和人们物质生活水平的不断提高,经济增长与环境保护之间的矛盾日益突出,尤其近几年雾霾天气肆虐横行,已经严重影响到了人们的正常生活,给人们的身体健康与生活环境带来了巨大威胁。过量排放的NOx是造成雾霾的罪魁祸首之一,NOx的治理迫在眉睫,为此,我国不断提高排放的要求,并提出了实现50 mg/m3超低排放目标,而为满足日益严格的环保排放要求,提高脱硝效率、降低脱硝成本是现今治理大气污染的重要研究内容之一。本文利用黄磷作为间接的氧化剂,对黄磷磷矿浆复合吸收液脱硝工艺以及黄磷与氧气反应产生臭氧的条件和机理进行了研究,旨在通过对磷矿浆脱硝的研究,结合现有的磷矿浆湿法脱硫技术,为未来在磷化工企业实现磷矿浆同时脱硫脱硝服务。通过研究,主要得到了以下结论:(1)考察了各实验因素对黄磷磷矿浆复合吸收液脱硝的影响,发现浆液体系的脱硝率随黄磷浓度、浆液pH、烟气含氧量、搅拌速度的增加而增加;随浆液温度、浆液含固量的增加先增加后减小;随NOx入口浓度、气量的增加而降低。根据实验结果,较合适的实验条件为:黄磷浓度1.6g/L,浆液pH控制在3.76以上,浆液温度65℃,浆液含固量为9.09%,氧气浓度6%,烟气流量535mL/min。(2)通过响应面优化实验,分析了 P4/NOx、浆液温度、浆液pH和气量对黄磷磷矿浆复合吸收液脱硝效率的影响以及它们之间的交互作用,各因素对浆液脱硝率影响程度的强弱由大到小依次为:P4/NOx、浆液温度、气量、浆液pH;P4/NOx、浆液温度、气量、P4/NOx和浆液温度的二次项、P4/NOx和浆液温度的交互项、浆液温度和气量的交互项以及P4/NOx和气量的交互项对浆液脱硝率有显著影响。(3)对黄磷磷矿浆复合吸收液生成臭氧的规律进行了研究,发现提高搅拌速度、黄磷浓度有利于臭氧的生成,臭氧浓度随浆液温度的增加呈先增加后减小趋势,最适宜的温度为65℃;不同分散介质对黄磷生成臭氧的影响很大,主要原因在于不同物质的颗粒大小和颗粒表面形貌不同;进一步研究表明,黄磷与氧气生成臭氧的反应主要发生在液相,为液相中的气液接触反应。
[Abstract]:With the continuous growth of population and the continuous improvement of people's material living standard, the contradiction between economic growth and environmental protection is becoming increasingly prominent, especially in recent years the haze weather is rampant, which has seriously affected the normal life of people. It has brought great threat to people's health and living environment. As one of the main culprits causing smog, it is urgent to control the excess no _ x emission. Therefore, our country has continuously raised the emission requirements, and put forward the goal of achieving the 50 mg/m3 ultra-low emission, in order to meet the increasingly stringent requirements of environmental protection emissions. To improve denitrification efficiency and reduce denitrification cost is one of the important research contents of air pollution control. In this paper, using yellow phosphorus as indirect oxidant, the denitrification process of yellow phosphorus pulp compound absorbent and the conditions and mechanism of the reaction of yellow phosphorus with oxygen to produce ozone were studied in order to study the denitrification of phosphate rock pulp. Combined with the existing wet desulphurization technology of phosphate rock slurry, it serves for the realization of simultaneous desulphurization and denitrification of phosphate rock slurry in phosphorous chemical enterprises in the future. The main conclusions are as follows: (1) the effects of various experimental factors on denitrification of yellow phosphorus pulp were investigated. It was found that the denitrification rate of the slurry system increased with the increase of yellow phosphorus concentration, pulp pH, flue gas oxygen content and stirring speed. The solid content of the slurry increases first and then decreases with the increase of the temperature of the slurry, and decreases with the increase of the inlet concentration of no _ x and the increase of the gas content. According to the experimental results, the suitable experimental conditions are as follows: yellow phosphorus concentration 1.6 g / L, slurry pH above 3.76, slurry temperature 65 鈩，

本文编号：2005525