【作者】 刘毅； 罗浩东； 费天皓； 张立强；

【Author】 Liu Yi;Luo Haodong;Fei Tianhao;Zhang Liqiang;Shenhua Guohua (Beijing) Electric Power Research Institute Co., Ltd;China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd;Shandong University;

【机构】 神华国华(北京)电力研究院有限公司； 中国能源建设集团广东省电力设计院研究院有限公司； 山东大学；

【摘要】 在固定床试验台上,开展了生物质灰对SO₂吸收特性的试验研究。主要考察了灰中掺水量、温度、烟气中水蒸气含量、SO₂浓度、CO₂浓度和NO₂浓度对脱除效果的影响。研究结果表明,生物质灰可高效吸收烟气中的SO₂,起到固硫作用。生物质灰中掺水量、反应温度和烟气中水分含量是影响生物质灰脱硫的主要因素,烟气中其他气体成分也影响SO₂的吸收。生物质灰中掺水后,促进了碱性物质的溶解,对SO₂的吸收起到强化作用;降低温度,延长了灰表面液膜的停留时间,有利于SO₂的脱除;模拟烟气中水蒸气含量的增加促进了脱硫反应的进行;烟气中的低浓度NO₂对SO₂的吸收起到促进作用,当NO₂浓度较高时,反应初期促进了SO₂的吸收,反应后期由于NO₂和SO₂的竞争反应,阻碍了SO₂的吸收。更多还原

【Abstract】 The characteristics of SO₂ absorption by biomass ash were studied on a fixed bed test-bed. The effects of water content in ash, temperature, water content in flue gas, SO₂ concentration, CO₂ concentration and NO₂ concentration on the removal efficiency were investigated. The results showed that biomass ash could effectively absorb SO₂ in flue gas and have good function of sulfur fixation. Water content in ash, reaction temperature and flue gas moisture content were the main factors affecting the desulfurization by biomass ash, and other gas components in flue gas also affect the absorption of SO₂. Water mixed in the biomass ash promoted the dissolution of alkaline substances and strengthens the absorption of SO₂; with the reduces of temperature the residence time of liquid membrane on the ash surface increased, which was conducive to the removal of SO₂; the increase of water vapor content in the flue gas promoted the desulfurization reaction; the low concentration of NO₂ in the flue gas promoted the absorption of SO₂; when the concentration of NO₂ was high, the initial reaction was accelerated. At the later stage, SO₂ absorption was inhibited because the competitive reaction between NO₂ and SO₂.更多还原