Investigation of plasma NOx treatment method for diesel exhaust gas at-exhaust gas temperature ranges

废气温度范围内柴油机废气等离子NOx处理方法的研究

基本信息

批准号：
14550280
负责人：
YOSHIOKA Yoshio
金额：
$ 1.92万
依托单位：
KANAZAWA INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550280/
关键词：
Silent discharge NOx NO removal efficiency Ozone High temperature Hydro-carbon Diesel exhaust gas Plasma プラズマ

项目摘要

Investigation of plasma NOx treatment for diesel exhaust gas at exhaust gas temperature ranges was carried out. Temperature of exhaust gas from diesel engine attains to about 400 deg at full power. Plasma treatment for this high temperature gas will be different from that for lower temperature in its efficiency, because chemical reactions become active at elevated temperature. Exhaust gases from a 2.4kVA diesel engine generator was used as a target of processing, and special experimental system that endures the high temperature was build in laboratory. Direct discharge and ozone injection method were used to investigate the effect of temperature for NO removal efficiency.In the first year, the NO removal efficiency up to 150 degree was investigated, and it was found that the NO removal efficiency by direct discharge method increases to about 30g/ kWh at the temperature range from 90 degree to 130 degree. It was also found that ozone injection method can be applied to at least up to 180degree, in spite of the suspicion that ozone is destroyed at high temperature and will not work. Hydro-carbon addition to exhaust gas has been known as a method to improve the NO removal efficiency; however there was no significant difference in the effect at high temperature up to 150degree in comparison with lower gas temperature.In the second year, the experimental system was improved to perform the plasma treatment at much higher temperature by adding some gas heating system. Experiments up to 220 degree were carried out, and it was found that the efficiency increases to 30 to 35 g/ kWh. In order to do experiment at much higher temperature, a new compact experimental system, which uses 1/10 of exhaust gases, was built. The plasma treatment up to 250 degree was become possible, and the experimental results showed that the NO removal efficiency increased up to 60g/kWh at gas temperature of 250 degree.

在废气温度范围内对柴油排气的血浆NOX处理进行了研究。柴油发动机的废气温度可达到约400度的全功率。该高温气体的血浆处理将与效率较低的温度不同，因为化学反应在升高的温度下变得活跃。 2.4kVA柴油发动机发生器的排气被用作加工的目标，并且在实验室中建立了高温的特殊实验系统。使用直接排放和臭氧注射方法来研究温度的效果，以无去除效率。在第一年，研究了最高150度的无去除效率，发现直接排放方法的无去除效率增加至温度在90度至130度的温度范围内约为30克/ kWh。还发现，尽管怀疑臭氧在高温下被破坏并且行不通，但臭氧注射方法至少可以应用于至少180度。在排气中添加的水碳被称为提高无去除效率的方法。但是，与较低的气体温度相比，高温下的效果没有显着差异。第二年，通过添加某些气体加热系统，改进了实验系统以在更高的温度下进行等离子体处理。进行了高达220度的实验，发现效率增加到30至35 g/ kWh。为了在更高的温度下进行实验，建立了一种新的紧凑型实验系统，该系统使用了1/10的废气。血浆处理最高为250度，实验结果表明，在250度的气温下，无去除效率提高到60g/kWh。