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在以往通常的过量空气系数α~“_n.n=1.15条件下运行时,焦炭——烟炱粒子在火焰中心业已燃尽。被烟气携带出来的残余未燃尽碳,实际上可以略而不计。通过锅炉各部烟气通道的烟色是透明的。随着过量空气系数的降低,燃烧过程拖长,焦炭——烟炱粒子被带入温度相对为较冷的区域,该处的温度水平已不足以保证碳粒的完全燃尽。因此,部分未燃尽碳被排烟带走,从而产生了机械未完全燃烧损失。在苏联,首次对燃油炉的机械未完全燃烧损失进行测定是由BTN(全苏热工研究所)作出的。按参考资料,在所研究的过量空气系数范围内(1.02及以上)。q_4<0.01%。按照较近的数据,机械未完全燃烧损失当α>1.03时等于零;当α<1.03时建议采用q_4=0.15。资料[2]中给出了更为详细的q_3、q_4与α关系
Coke-soot particles have been exhausted at the center of the flame when operated at a conventional excess air ratio α ~ ”_ n.n = 1.15. The residual unburned carbon carried by the flue gas can in fact be slightly Regardless of the flue gas passage through the boiler flue gas passage is transparent with the reduction of excess air coefficient, the combustion process drag longer, coke - soot particles are brought into the relatively cool area of the temperature where the temperature The level is not enough to ensure the complete burnout of carbon particles, so part of the unburned carbon is taken away by smoke and fumes, resulting in incomplete mechanical combustion losses.In the Soviet Union, the first incomplete determination of the mechanical loss of fuel oil furnace was By BTN (All Su Thermal Research Institute). According to reference data, in the range of excess air coefficient (1.02 and above) .q_4 <0.01%. According to the recent data, mechanical incomplete combustion loss when α > 1.03, and q_4 = 0.15 when α <1.03. The more detailed relationship between q_3, q_4 and α is given in [2]