Influences of ammonium sulfate additive on Cl and N co-transformation during biomass/semi-coke oxy-fuel co-combustion
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摘要: 在50 kW循环流化床燃烧实验台进行了O2/CO2气氛下硫酸铵添加剂对生物质和半焦混烧过程中K/S/Cl迁移和N2O/NO排放影响实验研究。结果表明，硫酸铵添加剂从提升管喷入后能够明显降低积灰中Cl含量，同时显著降低烟气中NO浓度。此外，硫酸铵添加剂还能够增强碱金属K向底渣和循环灰迁移转化，从而降低积灰中碱金属K含量。实验表明，硫酸铵添加剂的最佳喷入位置在提升管中上部。Abstract: To investigate the influences of ammonium sulfate(AS) on the K/S/Cl transformation and N2O/NO emission, the biomass and semi-coke were co-combusted in a 50 kW circulating fluidized bed under O2/CO2 atmosphere. The experimental results show that AS can reduce the Cl content in deposits obviously and decrease the NO concentration in flue gas significantly. Besides, AS can retain more K in bottom ash and circulating ash, thereby reducing the K content in deposits. In terms of reducing Cl in deposits, the top half of the riser is the optimal position to inject AS.
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图 4 硫酸铵添加剂对K迁移特性的影响
Figure 4 Effect of ammonia sulfate additive on the K transformation characteristic
图 5 硫酸铵添加剂对S迁移特性的影响
Figure 5 Effect of ammonia sulfate additive on the S transformation characteristic
图 6 硫酸铵添加剂对Cl迁移特性的影响
Figure 6 Effect of ammonia sulfate additive on the Cl transformation characteristic
图 7 未喷硫酸铵灰样品的XRD谱图
Figure 7 XRD patterns of ash samples without ammonia sulfate additive
1: SiO2; 2: CaCO3; 3: CaSO4; 4: CaO; 5: KCl
图 8 喷入硫酸铵(AS/Cl=5)灰样品的XRD谱图
Figure 8 XRD patterns of ash samples with ammonia sulfate additive (AS/Cl=5)
1: SiO2; 2: CaCO3; 3: CaSO4
图 9 硫酸铵添加剂对N2O和NO排放特性的影响
Figure 9 Effect of ammonia sulfate additive on the N2O and NO emission characteristics
图 10 硫酸铵添加剂喷入位置对K迁移特性的影响
Figure 10 Effect of ammonia sulfate injection position on the K transformation characteristic
图 11 硫酸铵添加剂喷入位置对S迁移特性的影响
Figure 11 Effect of ammonia sulfate injection position on the S transformation characteristic
图 12 硫酸铵添加剂喷入位置对Cl迁移特性的影响
Figure 12 Effect of ammonia sulfate injection position on the Cl transformation characteristic
图 13 硫酸铵添加剂喷入位置对N2O和NO排放规律的影响
Figure 13 Effect of ammonia sulfate injection position on the N2O and NO emission characteristics
表 1 实验燃料的工业分析与元素分析
Table 1 Proximate and ultimate analyses of experimental fuels
Fuel Proximate analysis wad/% Ultimate analysis wad/% Qar, net /(MJ·kg-1) M A V FC C H O N S Cl CS 6.66 14.92 62.60 15.82 39.29 4.65 33.43 0.91 0.14 0.58 14.51 SC 5.75 12.28 12.10 69.87 73.18 1.29 6.45 0.73 0.32 - 25.34 
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表 2 燃料灰成分分析
Table 2 Ash compositions of experimental fuels
Fuel Content w/% SiO2 Al2O3 Fe2O3 CaO MgO TiO2 SO3 P2O5 K2O Na2O CS 54.40 7.46 3.01 7.47 5.40 0.50 2.10 1.52 11.47 1.89 SC 16.84 7.36 11.46 49.60 1.64 0.44 8.18 0.08 0.23 0.64
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