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首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >NUMERICAL STUDY OF CO AND CO_2 EMISSIONS FROM RURAL KITCHEN IN DEVELOPING COUNTRIES
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NUMERICAL STUDY OF CO AND CO_2 EMISSIONS FROM RURAL KITCHEN IN DEVELOPING COUNTRIES

机译：发展中国家农村厨房有限公司股份有限公司的数值研究

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In this study the pattern and varying intensity of CO and CO_2 emission from different kinds of Biofuel used in the rural areas of developing countries have been investigated. A typical rural kitchen of dimension 3.0m × 1.5m × 2.2m is constructed with an improved concrete oven. We have measured the source concentration at the stove and used the value for the numerical model. In the current analysis it is observed that at closed ventilation condition, CO and CO_2 concentration exceeds safe limiting value. Even under the natural ventilation, it fails to keep the concentration below the safe threshold. However in forced ventilation system at 5m/s, the concentration level drops significantly. At the breathing point, for a source concentration of 338 PPM and without any ventilation, numerical results predict the CO concentration to be 70 PPM. Natural ventilation case shows no improvement while forced ventilation suppresses the concentration by 70%. On the other hand, for a no ventilation condition, CO_2 concentration is found to be as 2050 PPM when the source level concentration is 7100 PPM. Forced ventilation at 5m/s decreases the concentration to 750 PPM, well within the safe limit. High concentration was found to accumulate beneath the roof and on the top of the stove. It is then dispersed to the entire upper region of the kitchen. Deploying a duct in the exact spot shows that forced ventilation captures most of the fume and decreases dispersion along the roof. In no ventilation and natural ventilation cases, high concentration accumulation can be observed in the lower-left and lower-right corners, both in longitudinal and lateral planes which eventually affects the breathing zone concentration. On the other hand, for forced ventilation case, concentration at lower-left and lower-right corner is greatly reduced resulting low concentration at the breathing zone.
机译：在本研究中，研究了来自发展中国家农村地区的不同种类生物燃料的CO和CO_2排放的模式和变化强度。尺寸为3.0米×1.5米×2.2M的典型农村厨房，采用改进的混凝土烤箱。我们已经测量了炉子处的源浓度，并使用了数值模型的值。在目前的分析中，观察到，在闭合通风条件下，CO和CO_2浓度超过了安全限制值。即使在自然通风下，它也无法将浓度保持在安全阈值以下。然而，在5M / s的强制通风系统中，浓度水平显着下降。在呼吸点，对于338ppm的源浓度而没有任何通风，数值结果将CO浓度预测为70ppm。自然通风盒显示出不适的改善，而强制通风抑制浓度为70％。另一方面，对于无通气条件，当源电量浓度为7100ppm时，发现CO_2浓度为2050ppm。 5M / s的强制通风将浓度降至750ppm，井在安全极限内。发现高浓度积聚在屋顶下方和炉子顶部。然后将其分散到厨房的整个上部区域。在确切点部署管道显示，强制通风捕获大部分烟雾，并降低沿屋顶的分散。在无通风和自然通气案例中，在左右右角可以观察到高浓度积聚，纵向平面都在最终影响呼吸区浓度。另一方面，对于强制通风案例，左下角和右下角的浓度大大降低，导致呼吸区的低浓度。

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