关键词:

O₂/CO₂燃烧;O₂浓度;CO₂浓度;石灰石添加, SO₂/NO排放

Abstract:

The effects of O₂ concentration, CO₂ concentration, temperature and limestone addition on SO₂/NO emission characteristics from Xuzhou bituminous coal and Longyan anthracite coal combustion in O₂/CO₂ atmosphere were studied in a horizontal tube furnace.The results showed that the release characteristics of SO₂ /NO were different between O₂/CO₂ combustion and air combustion, and with the same O₂ concentration,SO₂ and NO emissions were lower in O₂/CO₂ combustion than those in air combustion.As O₂ concentration increased, SO₂/NO emission during O₂/CO₂ combustion increased and with increasing CO₂ concentration, SO₂/NO emission decreased.In O₂/CO₂ atmosphere, the sulfur retention ability of limestone addition was lower than that in air atmosphere, while limestone addition could reduce the NO emission.The element composition of coal ash indicated that the reduction of SO₂ during O₂/CO₂ coal combustion was due to improved sulfur retention ability of coal ash, and the reduction of NO was due to intensified transformation of fuel-N to other N-containing gaseous species.

Key words:

O₂/CO₂燃烧;O₂浓度;CO₂浓度;石灰石添加, SO₂/NO排放