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在1 MW流化床(CFB)燃烧试验台试烧5种不同掺烧比例的石油焦和油页岩混合燃料。对燃烧产生的灰渣特性进行了分析研究。分析结果表明,石油焦和油页岩混合燃料试烧后形成的底渣和飞灰粒度与常规煤种相比趋于偏细;而且,随着混合燃料中油页岩掺烧比例的升高,对灰渣份额、燃烧效率、飞灰比电阻值、飞灰磨损特性等都有明显的影响。在钙硫比为0和2.4时,随着油页岩掺烧比例由2∶8升高6∶4,飞灰份额均明显增加,灰渣排放总量也同时提高,试验所得燃烧效率均逐渐降低。在钙硫比为2.4时,当油页岩的掺混比例由3∶7提高至5∶5,飞灰的比电阻值由1.15×1012Ω.cm升高至1.40×1012Ω.cm。飞灰磨损特性指数Hm由10.27%升高21.34%。试验结果对实炉试烧混合燃料以及采用相近燃料的CFB锅炉的设计、运行有一定的参考意义。
Five different proportions of petroleum coke and oil shale mixed fuel were tested on a 1 MW fluidized bed (CFB) combustion test bench. The characteristics of ash produced by combustion were analyzed. The analysis results show that the particle sizes of bottom slag and fly ash formed after the trial burning of petroleum coke and oil shale mixed fuel tend to be thinner than those of conventional coal. Moreover, with the increase of blending proportion of oil shale in the mixed fuel, On the ash content, combustion efficiency, fly ash resistance, fly ash wear characteristics have a significant impact. When the ratio of calcium to sulfur is 0 and 2.4, the proportion of fly ash increases obviously with the ratio of oil shale blending from 2:8 to 6: 4, and the total amount of ash discharge also increases at the same time. The combustion efficiency of the test increases gradually reduce. When the ratio of calcium to sulfur is 2.4, the specific resistance of fly ash increased from 1.15 × 1012Ω.cm to 1.40 × 1012Ω.cm when the mixing ratio of oil shale increased from 3: 7 to 5: 5. Fly ash wear characteristics index Hm increased from 10.27% 21.34%. The test results have certain reference meaning for the design and operation of real furnace test-burning mixed fuel and CFB boiler adopting similar fuel.