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Fig. 8 shows that the oxygen content in the flue gas has almost no change in 1 min , thus the average value of the oxygen content can be regarded as the measured oxygen content (the measuring cycle of the oxygen sensors takes1 min). According to the space–time fusion model (Fig. 5),for the same sensor, the oxygen content measurements from the first and second measurement cycles are fused to obtain more accurate oxygen content. Fig. 13 shows the cloud droplets over a period of 6 min generated by the mean value and space–time fusion. Each subplot represents results over a period of 1 min. En obtained by the space–time fusion method is less than that obtained by the space fusion. The fusion results of Ex and En over a period of 60 min are plotted in Fig. 14. It can be observed from Fig. 14 that the standard deviation obtained by the space–time fusion method is only ～0.01, smaller than the space fusion method and significantly smaller than the mean value method. Therefore, the uncertainty of the oxygen content measurement obtained through the space–time fusion method is improved significantly. IV. COMBUSTION EFFICIENCY IMPROVEMENT To improve combustion efficiency and reduce heat loss due to incomplete combustion, the actual amount of air fed to the furnace is greater than the theoretical value. Because a slight change in oxygen content in the flue gas will affect the boiler efficiency significantly, the excess air must be strictly controlled. The excess air can be estimated from the measured oxygen content in the flue gas [1], [2] The temperature difference between the flue gas and the cold air, and the flue gas oxygen content obtained using the space–time fusion and mean value methods are substituted into (13)and (14) to obtain the combustion efficiency and flue gas heat loss. The results are plotted in Fig. 15. |
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reko34
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根据图8所示，废气中氧含量在1分钟内几乎没有变化，于是氧含量的平均值可被视为测得的氧含量（氧传感器的测量周期为1分钟）。根据空间-时间融合模型（图5），将同一个传感器第1和第2个测量周期的氧含量测量结果融合得到更准确的氧含量。 图13所示为通过平均值和空间-时间融合生成的6分钟时间段内的云滴。 空间-时间融合法得到的En小于空间融合。 60分钟时间段内的Ex和En融合结果绘制图14. 从图14可以看到，空间-时间融合法得到的标准差只有～0.01，小于空间融合法，远小于平均值法。 因此，通过空间-时间融合法的氧含量测量不确定性得到显著提升。 IV. 燃烧效率改进 为改进燃烧效率和减少因不完全燃烧造成的热损失，供给熔炉的真实空气量大于理论值。由于废气中氧含量的微小改变会显著影响锅炉效率，过量空气必需得到严格控制。 过量空气可以通过废气中测得的氧含量进行估计[1],[2] 废气和冷空气之间的温度差以及空间-时间融合法和平均值法得到废气氧含量代入（13）和（14）得到燃烧效率和废气热损失。 结果绘制于图15。 |
2楼2014-05-19 12:05:02
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