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Effect and Mechanism of Thermal NO Reduction with Negative Catalyst

负催化剂热还原NO的效果及机理

基本信息

批准号：
07455089
负责人：
MIYAMTO Noboru
金额：
$ 4.54万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In this research, effect of metallic catalyst in combustion zone on a reduction of NO as well as dry soot was investigated.The metallic catalysts tested were teh alkaline metals including Na, K,Ca, Mg, Li and others.These were introduced directly into the combustion flame zone in intermicttent and continuous combustion systems as fine mist of metal-salt solutions or fine solid powder. The combustion products in the combustion zone and the exhaust were measured and analized.As the experimental results, it was found that a reduction of NO as well as dry soot in the combustion zone was achieved by introducing the alkaline metals, particulary Na metal, into the combustion zone. The NO reduction may result not from metal nitrates formation from Na and NO,but mainly from catalytic promotion of NO deoxidation with Na metal. meaning negative catalytic effect of Na metal on thermal NO formation.The dry soot reduction caused mainly by catalytic promotion of soot oxidation with Na.Na introduced into combustion zone was converted to sodium sulfates with high solubility to water, so that a technology for removing the sodium componds from the combustion products was suggested to establish.

本文研究了燃烧区金属催化剂对NO和干碳烟的还原作用，试验的金属催化剂是Na、K、Ca、Mg、Li等碱金属，它们以金属盐溶液的细雾或细固体粉末的形式直接引入间歇和连续燃烧系统的燃烧火焰区。通过对燃烧区燃烧产物和排气的测定和分析，发现在燃烧区引入碱金属，特别是Na金属，既能降低NO，又能降低干碳烟。NO的还原可能不是由Na和NO生成金属硝酸盐引起的，而主要是Na金属对NO还原的催化促进作用。Na对热NO生成有负催化作用，而干碳烟还原主要是由于Na对碳烟氧化的催化促进作用，引入燃烧区的Na可转化为水溶性高的硫酸钠，从而提出了一种从燃烧产物中脱除钠化合物的技术。