Abstract:

The characteristics of NO_x and SO₂ emission from combustion of antibiotic mycelial residue with high water content in a fluidized bed reactor were studied. The results showed that with the increase in excess air ratio, the NO_x emission concentration increased while the SO₂ emission concentration decreased. Enhancing the combustion temperature led to the increases in both the NO_x and SO₂ emission concentrations. With increasing fuel moisture content, both the NO_x and SO₂ emission concentrations first decreased and then increased. The air-staging combustion enabled good control of NO_x emission. The NO_x emission concentration was significantly lower with increasing the secondary air ratio. At the secondary air ratio 3/7, the air-staging combustion cut the NO_x emission amount off by more than 50% compared to the traditional combustion. Desulfurization by adding CaCO₃ into the furnace indicated that the SO₂ emission concentration decreased with increasing molar ratio of calcium to sulfur (Ca/S), and when Ca/S 3, the SO₂ emission concentration decreased to below 25 mg·m^-3 and the sulfur removal efficiency surpassed 99%.

Key words: antibiotic mycelia residue, fluidized-bed, combustion, high water content, NO_x emission, SO₂ emission, air-staging, desulfurization

摘要：

采用流化床反应器，研究了高含水抗生素菌渣直接燃烧的NO_x、SO₂排放特性。结果表明，增加过量空气系数，NO_x排放浓度升高，SO₂排放浓度降低；升高燃烧温度，NO_x及SO₂排放浓度均升高；随着燃料含水率的增加，NO_x及SO₂排放浓度均呈现先降低后升高的趋势。空气分级燃烧能有效降低NO_x排放，二次风率增加，NO_x排放浓度显著降低；当二次风率为3/7时，NO_x排放浓度较传统燃烧降低50%。添加CaCO₃进行炉内脱硫，实验结果显示：随钙硫摩尔比（Ca/S）增加，SO₂排放浓度下降，当Ca/S 3时，SO₂排放浓度降低到25 mg·m^-3以下，脱硫效率超过99%。

关键词: 抗生素菌渣, 流化床, 燃烧, 高含水, NO_x排放, SO₂排放, 空气分级, 脱硫