N_2O emission factors of nitric acid production in China from CDM projects

Industrial production process including nitric acid production is an important greenhouse gas emission source. Although IPCC guidelines have given calculation methods and emission factors for N2O emission from nitric acid production, emission factors of nitric acid production in China are not given. And it can be seen from the comparison of the guidelines and registered CDM projects in China that the N2O emission factors given in the IPCC guidelines and actual N2O emission from nitric acid production in China differ greatly while measured N2O emission data is not available, so determination of emission factors for N2O emission from nitric acid production is an important basic research for N2O emission calculation in China. The method that calculate N2O emission factors from nitric acid production in China is studied with baseline emission factors based on actual measurement of registered CDM projects and the calculated emission factor is compared with that given in the IPCC guidelines in the text.

硝酸生产尾气中NO_(x)和N_(2)O联合脱除技术研究进展

采用氨氧化法生产稀硝酸时会排放NO_(x)(NO和NO_(2))和N_(2)O等有害气体,可导致光化学烟雾(NO_(x))、臭氧层消耗(NO_(x)和N_(2)O)、全球变暖(N_(2)O)等环境问题,减少硝酸生产尾气中NO_(x)和N_(2)O的排放势在必行。本文在分析硝酸生产过程中NO_(x)和N_(2)O产生途径及减排措施的基础上,根据国内外研发和应用情况总结了联合脱除硝酸生产尾气中NO_(x)和N_(2)O的主要技术路线,包括利用SCR催化剂同时催化NO_(x)和N_(2)O还原和利用复合式催化剂同时催化NO_(x)还原和N_(2)O分解等一段式工艺以及先催化N_(2)O分解后催化NO_(x)还原、先催化NO_(x)还原后催化N_(2)O还原和先催化NO_(x)还原后催化N_(2)O分解等两段式工艺,分析了不同技术路线的原理、特点及面临的挑战。文中指出了一段式工艺主要存在N_(2)O净化性能有待提升的问题,两段式工艺中先催化NO_(x)还原后催化N_(2)O分解的工艺在减少还原剂消耗量、促进N_(2)O去除等方面具有优势,未来需围绕同步降低SCR脱硝和N_(2)O分解所需温度、提高催化剂对共存气体(O_(2)、H_(2)O等)的耐受性等方面开展进一步研究。

硝酸尾气源头治理的原理与方法

从硝酸生产的基本原理出发,并结合实际探讨了源头治理硝酸生产尾气中NOx的方法。该方法不仅符合清洁生产机制,而且从源头治理后且未经后期处理的尾气中的NOx体积分数可达到50×10-6以下,治理效果明显。

硝酸尾气计算公式化(待续)

提出硝酸尾气处理及若干计算公式与图表,可供工厂管理人员和技术人员参考。

硝酸生产尾气治理装置试运行总结研究

简述了当前比较先进的硝酸生产工艺,并以催化还原尾气治理装置为例,对试运行情况加以总结,概括了相关脱硝反应及治理方式,重点探讨了运行治理效果及运行问题。