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首页> 外文期刊>Transactions of The Institution of Chemical Engineers. Process Safety and Environmental Protection, Part B >Numerical simulation study on the influences of the secondary-tertiary air proportion on the airflow mixing effects and pulverized coal combustion characteristics in a 300-MW down-fired boiler
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Numerical simulation study on the influences of the secondary-tertiary air proportion on the airflow mixing effects and pulverized coal combustion characteristics in a 300-MW down-fired boiler

机译：二次三级空气比例对300 MW下烧锅炉气流混合效应和煤粉燃烧特性影响的数值模拟研究

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In this paper, based on the MIMSC (multi-injection and multi-stage combustion) technology, new burner arrangement and air distribution parameter settings were proposed for a 300-MW subcritical down-fired boiler originally using MBEL (Mitsui Babcock Energy Limited) combustion technology. Numerical simulations were conducted to study the influences of the secondary-tertiary air proportion on the airflow mixing effect in the furnace, the ignition and pulverized coal combustion characteristics. The airflow mixing effect in the furnace is characterized by the size of the dimensionless vertical velocity decay area (V-da) and the fluctuation of the maximum vertical velocity decay curve (V-dc). During the research, the sum of the secondary and tertiary air rate remained constant, and the secondary air rate was set to 30.54%, 33.54%, 36.54%, 39.54%, and 42.54%. It was found that under the condition of using new type burner, with the secondary air rate increased from 30.54% to 42.54%, the ignition distance of pulverized coal decreased from 1.30m to 0.84m, the dimensionless penetration depth decreased from 1.46 to 1.27, and the NOx emission and carbon in the fly ash decreased first and then increased. The variation of V-dc showed the following regulation. At the secondary air rate of 30.54% to 33.54%, increasing the secondary air rate decreased the fluctuation amplitude. While at the secondary air rate of 39.54% to 42.54%, increasing the secondary air rate increased the fluctuation amplitude. Only at the secondary air rate of 36.54%, V-dc in the tertiary air mixing area was smooth. When V-dc was smooth, V-da was small at 0.043, the carbon in fly ash at the furnace outlet was the lowest at 4.19%, and the NOx emission was low at 675.9 mg/m(3) at 6% O-2. An optimal secondary air rate of 36.54% is recommended. For the subsequent design of burner structure and parameters, it is suggested that V-dc in the tertiary air mixing area should be smooth. (C) 2019 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.
机译：本文基于MIMSC（多注射和多级燃烧）技术，为最初使用MBEL（Mitsui Babcock Energy Limited）燃烧的300 MW亚临界下烧锅炉提出了新的燃烧器布置和空气分配参数设置技术。进行了数值模拟，以研究二次三级空气比例对炉内气流混合效应的影响，点火和粉煤燃烧特性。炉中的气流混合效果的特征在于无量纲垂直速度衰减区域（V-DA）的尺寸和最大垂直速度衰减曲线（V-DC）的波动。在研究期间，二级和三级空气速率的总和仍然是恒定的，二次空气速率设定为30.54％，33.54％，36.54％，39.54％和42.54％。结果发现，在使用新型燃烧器的条件下，二次空气速率从30.54％增加到42.54％，粉煤煤的点火距离从1.30米下降至0.84米，无量纲渗透深度从1.46降至1.27，并且粉煤灰中的NOx排放和碳首先下降，然后增加。 V-DC的变异显示出以下调节。在二级空气速率为30.54％至33.54％，增加二次空气速率降低了波动幅度。虽然以39.54％至42.54％的二级空气速率，增加二次空气速率增加了波动幅度。仅在三级空气速率为36.54％，第三次空气搅拌面积的V-DC光滑。当V-DC光滑时，V-DA小于0.043时，炉出口中的粉煤灰中的碳在4.19％下最低，NOx排放在675.9 mg / m（3）下，在6％O- 2。建议使用36.54％的最佳二级空气速率。对于随后的燃烧器结构和参数设计，建议三级空气混合区域中的V-DC应该是光滑的。 （c）2019年由Elsevier B.V发布。代表化学工程师机构。

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