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Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

机译：通过中空纤维膜组件中含有硝酸和过氧化氢的吸收剂溶液还原氮氧化物

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Emissions of nitrogen oxides such as NO and NO , which are commonly known as NOx, are threats to human existence and cause environmental problems. Mainly, two techniques have been developed to drastically reduce these emissions, which are dry and wet processes. The wet process has several advantages, major identifiable advantages are the adaptability to the flue gas, low operating temperatures and no poisoning and inactivation catalyst. Also, a mixture of hydrogen peroxide and nitric acid are used as absorbents solution for NOx reduction in the wet process. The advantages of using this mixture include the ability to reduce the negative effect of NOx and does not contaminate the scrubbing solution. In addition, nitric acid has an economical advantage in the process considering the fact that it is produced in the process. Finally, it can be conducted at ambient temperature. This study furthermore used a mixture of hydrogen peroxide and nitric acid solutions as an absorbent to reduce NOx in hollow fiber membrane modules. The hydrogen peroxide oxidized HNO to nitric acid, while enhances the oxidation through an autocatalytic reaction. The effects of the feed gas flow rate, hydrogen peroxide concentrations and number of fibers on the NOx reduction, absorbed NOx and flux were varied to study. The experimental results showed that the increase in the feed gas flow rate from 100 to 200 mL/min decreased NOx reduction from about 98 to 94% but increased the absorbed NOx and flux from about 0.13 to 0.255 mmol/h and 0.85–1.63 mmol/m .h, respectively The increase in proportion of NO in the feed gas effect was dominant than the increase in absorbed NOx. An increase in hydrogen peroxide concentration from 0.5 to 10 wt.% in the absorbent solutions increased NOx reduction, absorbed NOx and flux from about 94 to 98%, 0.257–0.267 mmol/h and 1.09–1.13 mmol/m .h, respectively. Additionally, the H O plays an important role in enhancing HNO oxidation to HNO . Furthermore, an increase in the number of fibers from 50 to 150 in the membrane module increased NOx reduction and absorbed NOx from 86 to 97% and 0.23–0.27 mmol/h. Flux decreased from 2.98 to 1.13 mmol/m .h due to increment in the gas-liquid contact surface area.
机译：氮氧化物（例如NO和NO）的排放通常被称为NOx，对人类生存构成威胁，并引起环境问题。主要地，已经开发了两种技术以大幅度减少这些排放，这是干法和湿法工艺。湿法具有几个优点，主要的优点是对烟道气的适应性，较低的工作温度以及无毒和灭活催化剂。另外，过氧化氢和硝酸的混合物用作吸收剂溶液，用于在湿法工艺中还原NOx。使用这种混合物的优点包括能够减少NOx的负面影响，并且不会污染洗涤液。另外，考虑到硝酸是在过程中产生的事实，硝酸在过程中具有经济优势。最后，它可以在环境温度下进行。这项研究还使用过氧化氢和硝酸溶液的混合物作为吸收剂，以还原中空纤维膜组件中的NOx。过氧化氢将HNO氧化为硝酸，同时通过自催化反应增强氧化。改变进料气体流速，过氧化氢浓度和纤维数量对NOx还原，吸收的NOx和通量的影响进行研究。实验结果表明，进料气流速从100 mL / min增加到200 mL / min，NOx还原率从约98％降低到94％，但吸收的NOx和通量从约0.13增至0.255 mmol / h和0.85-1.63 mmol / min。 m.h分别比进料NOx的吸收量占主导地位。吸收剂溶液中过氧化氢浓度从0.5增加到10 wt。％分别增加了NOx的减少，吸收的NOx和通量分别从94％增至98％，0.257-0.267 mmol / h和1.09-1.13 mmol / m .h。另外，H O在增强HNO氧化为HNO中起着重要作用。此外，膜组件中纤维数量从50增加到150增加了NOx的减少，吸收的NOx从86％增至97％和0.23-0.27 mmol / h。由于气液接触表面积的增加，通量从2.98降至1.13 mmol / m .h。

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