大豆秆与煤混燃过程颗粒汞生成特性的试验研究

EXPERIMENTAL INVESTIGATION ON PARTICULATE-BOUND MERCURY FORMATION CHARACTERISTICS AT SOYBEAN ROD AND COAL CO-FIRING CONDITIONS

在高温管式电加热炉上进行大豆秆与3种煤掺混燃烧试验,掺混比例为95∶5、90∶10、85∶15,试验温度为1250℃。采集不同燃烧过程飞灰样品,对飞灰汞含量进行测定。计算燃料单位发热量汞含量及单位发热量汞排放(称为折算汞含量与折算汞排放)。研究结果表明:随大豆秆比例的增加,掺混燃料的汞灰比无显著变化,但氯汞比增加十分显著;1号煤掺混大豆秆后Hgp含量及Hgp比率均表现为增加趋势,但2号煤、3号煤情况却不相同;随大豆秆掺混比的增加,3种煤与大豆秆掺混燃料的折算汞含量均呈下降趋势,但折算气态汞生成并不一定下降。

Three coals were blended with soybean rod at 95： 5, 90：10 and 85：15 mass ratios. The combustion experiments were conducted at 1250 ℃ in a high temperature electrical reactor. The fly ashes were collected and the Hg contents were measured. The Hg contents and Hg emissions of unit calorific value （named calculated Hg content and calculated Hg emission） of the blended fuels were calculated. The results indicated that the ratio of C1 to Hg of the fuel increases with the increase of the soybean rod ratio while the ratio of Hg to ash doesn＇ t change significantly. The increasing of the soybean rod ratio leads to an increase in both Hg content in ash and Hgp ratio for coal 1 while coal 2 and coal 3 are different. The Increase of the soybean rod ratio makes the calculated Hg content decrease but the calculated gaseous Hg emission is not definite.