烟气脱硫脱氮技术综述

本文主要介绍了烟气中二氧化硫和氮氧化物的脱除技术。目前二氧化硫的脱除技术有燃烧前脱硫、燃烧中脱硫和燃烧后脱硫三种。燃烧后脱硫技术又称为烟气脱硫技术。烟气脱硫技术有湿法、干法和半干法三种,其中湿法应用最为广泛。NOx的控制技术有选择性催化还原法、选择性非催化还原法、烟道气循环法、低NOx燃烧器法。其中,选择性催化还原法是应用最多、技术最成熟的一种烟气脱氮方式。此外,还有SO2和NOx的一体化脱除技术。

DISCUSSION ON TECHNIQUES OF GAS DESULFURIZATION AND DENITRATION

The Treatment techniques of gas desulfurization and denitration have been dis- cussed. The three techniques of desulfurization are before combustion desulfurization, between combustion desulfurization and after combustion desulfurization. The after combustion desul- furization is called gas desulfurization also. The three methods of gas desulfurization are wet method, dry method and half dry method. And the wet method is most widely used. The tech- niques of denitration are selective catalytic reduction, selective non-catalytic reduction, flue- gas recycle and light nitrogen burn. And the selective catalytic reduction method is most widely used. The sulfur dioxide and nitrogen oxide in the gas can be desorbed at the same time.