钴配合物吸收液处理氮氧化物的研究

发布时间：2018-06-13 03:37

  本文选题：NO + 钴配合物　； 参考：《江南大学》2015年硕士论文

【摘要】：随着国民经济的快速发展,能源消耗带来氮氧化物的排放量急剧上升。目前我国在氮氧化物的控制上主要利用低氮燃烧技术、选择性催化还原(SCR)、选择性非催化还原(SNCR)技术,取得了一定的效果,但是仍存在一些问题。金属配合物络合吸收法因其温和的反应条件和高效的脱氮效率引起了大家的关注。本文以半胱氨酸合钴(II)、蛋氨酸合钴(II)和巯基丙酸合钴(II)为吸收液,分别考察了三种吸收液在简易吸收装置中去除NO的能力。半胱氨酸合钴(II)处理NO的最优条件:吸收液浓度0.03 mol/L,摩尔配比1:3,温度30 oC,p H值为9,NO进气浓度759 mg/m3,NO去除率可达87%;蛋氨酸合钴(II)处理NO的最优条件:吸收液浓度0.05 mol/L,摩尔配比1:2,温度30 oC,p H值为8,NO进气浓度759 mg/m3,NO去除率可达80%;巯基丙酸合钴(II)处理NO的最优条件:吸收液浓度0.02 mol/L,摩尔配比1:4,吸收液30 oC,p H值为9,NO进气浓度759 mg/m3,NO去除率可达88%。在上述最优吸收条件下,半胱氨酸合钴(II)、蛋氨酸合钴(II)和巯基丙酸合钴(II)处理NO的络合容量分别为0.83 mmol/L、0.73 mmol/L和0.90 mmol/L。采用中空纤维膜接触器,以巯基丙酸合钴(II)为吸收液处理NO。最佳工艺参数为:Co2+和巯基丙酸摩尔配比为1:4,NO气体流速0.027 m/s,浓度612.47 mg/m3,吸收液p H值为9,浓度0.02 mol/L,流量2.97×10-6 m3/s,温度50 oC,NO去除率达到99.16%,总传质系数为2.24×10-5 m/s。以蛋氨酸合钴(II)为吸收液处理NO。最佳工艺参数为:Co2+和蛋氨酸摩尔配比为1:2,NO气体流速0.027 m/s,浓度612.47 mg/m3,吸收液p H值为8,浓度0.05 mol/L,流量4.28×10-6 m3/s,温度50 oC。NO去除率可达98.85%,总传质系数为2.23×10-5 m/s。分别在上述最佳条件下,初步探究了钴配合物吸收液处理NO的反应机理。采用Na2SO3、L-抗坏血酸、活性炭还原再生钴配合物吸收液,其能力依次为:活性炭L-抗坏血酸Na2SO3。增加活性炭比表面积、用量、反应温度、搅拌速度和减小p H均能增强粉状活性炭对钴配合物再生的效率。巯基丙酸合钴(II)的最佳再生条件为:粉状活性炭使用量6 g/L,反应温度80 oC,p H值为3,搅拌速度200 r/min,再生率为94.35%。蛋氨酸合钴(II)的最佳再生条件为:粉状活性炭使用量8 g/L,反应温度80 oC,p H值为3,搅拌速度300 r/min,再生率为91.11%。
[Abstract]:With the rapid development of the national economy, energy consumption brings a sharp increase in nitrogen oxide emissions. At present, the technology of low nitrogen combustion, selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) are mainly used in the control of nitrogen oxides in China, but there are still some problems. Complex absorption of metal complexes has attracted much attention due to its mild reaction conditions and high denitrification efficiency. In this paper, the ability of removing no from three kinds of absorbents in a simple absorption device was investigated by using cysteine Cobalt (II), methionine Cobalt (II) and Mercaptopropionate Cobalt (II) as absorbents. The optimum conditions for no treatment were as follows: the concentration of absorbent solution was 0.03 mol / L, the molar ratio was 1: 3, and the temperature was 30 oC ~ (-1). The removal rate of no could reach 87g 路m ~ (3) N ~ (2). The optimum conditions for no treatment were as follows: the concentration of absorbent was 0.05 mol / L, the concentration of no was 0.05 mol 路L ~ (-1), and the removal rate of no could be up to 87g / m ~ (3). Molar ratio of 1: 2, temperature of 30oC ~ (-1) H = 8 渭 m ~ (-1) no intake concentration 759 mg / m ~ (3) no removal rate can reach 80. The optimum conditions for no treatment by thioglycolylic acid and Cobalt II) are as follows: absorbent concentration 0.02 mol / L, molar ratio 1: 4, absorbent 30 oCpH = 759 mg / m ~ (3) no removal rate. Under the above optimum absorption conditions, the complexation capacities of no treated with cysteine Cobalt II, methionine Cobalt II) and Mercaptopropionate Cobalt II) were 0.83 mmol / L 0.73 mmol / L and 0.90 mmol / L, respectively. The hollow fiber membrane contactor was used to treat no with cobalt thiolpropionate II as absorbent. The optimum technological parameters are as follows: molar ratio of 1: CO2 and mercaptopropionic acid is 1: 4no gas flow rate 0.027 m / s, concentration 612.47 mg / m 3, pH value of absorbent solution 9, concentration 0.02 mol / L, flow rate 2.97 脳 10 -6 m3 / s, removal rate of no at 50oC ~ (2) N = 99.16 and total mass transfer coefficient 2.24 脳 10 ~ (-5) Ms / s. No was treated with methionine Cobalt II as absorbent. The optimum technological parameters are as follows: the molar ratio of 1: CO2 and methionine is 1: 2no gas flow rate 0.027 m / s, the concentration is 612.47 mg / m 3, the pH value of the absorbent solution is 8, the concentration is 0.05 mol / L, the flow rate is 4.28 脳 10 -6 m3 / s, the temperature is 50 oC.NO removal rate can reach 98.85 batches, the total mass transfer coefficient is 2.23 脳 10 ~ (-5) m / s. Under the above optimum conditions, the reaction mechanism of no treatment with cobalt complex absorbent solution was preliminarily investigated. Na2SO3 L- ascorbic acid and activated carbon were used to reduce and regenerate cobalt complex absorbents. The order of their ability was as follows: activated carbon L- ascorbic acid Na _ 2SO _ 3. Increasing the specific surface area, amount of activated carbon, reaction temperature, stirring speed and reducing pH can enhance the regeneration efficiency of cobalt complex. The optimum regeneration conditions were as follows: dosage of powdered activated carbon was 6 g / L, reaction temperature was 80 鈩，

本文编号：2012543