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Effect Of Air Preheating And Fuel Moisture On Combustion Characteristics Of Corn Straw In A Fixed Bed

机译：空气预热和燃料水分对固定床玉米秸秆燃烧特性的影响

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Experiments were carried out on a one-dimensional bench combustion tests rig. The effect of air preheating and moisture level in the fuel on combustion characteristics of corn straw was investigated. The bed temperature distribution and the mass loss of fuel and gas components such as O_2, CO, CO_2 and NO were measured in the bed. The average burning rate and ignition front propagation velocity increased with increasing primary air preheating temperature. The total burning time was shorter under the higher primary air preheating temperature and the higher primary air preheating temperature produced a lower ignition front flame temperature in the bed. The variation of the flue gas O_2, CO and CO_2 concentrations with time was more intensive at a higher primary air preheating temperature during the ignition front propagation period and the char oxidation period. With the increase of the fuel moisture, average burning rate and ignition front propagation velocity decreased. As the fuel moisture was less than 30.71%, with the increase of the fuel moisture, residual mass loss rate decreased and ignition front flame temperature increased at a fixed air flow rate. Drier fuels resulted in fuel-rich combustion and higher CO concentration. The NO concentration decreased with increasing the moisture level in the fuel.
机译：实验是在一维台式燃烧试验台上进行的。研究了空气中的预热和燃料中的水分含量对玉米秸秆燃烧特性的影响。在床中测量床温度分布以及燃料和气体组分（例如O_2，CO，CO_2和NO）的质量损失。平均燃烧率和点火前传播速度随一次空气预热温度的升高而增加。在较高的一次空气预热温度下，总燃烧时间较短，而较高的一次空气预热温度在床内产生较低的点火前火焰温度。在较高的一次空气预热温度下，在点火前传播期和炭氧化期，烟气中O_2，CO和CO_2的浓度随时间的变化更加强烈。随着燃料水分的增加，平均燃烧速率和点火前沿传播速度降低。当燃料水分小于30.71％时，随着燃料水分的增加，在固定的空气流量下残留质量损失率降低并且点火前火焰温度升高。较干燥的燃料导致富燃料燃烧和更高的CO浓度。 NO浓度随着燃料中水分含量的增加而降低。

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