寒冷地区某电厂主厂房夏季通风的数值模拟分析
Numerical simulation and analysis of ventilation in summer for main building of a power plant in cold zone
摘要：
为了确定寒冷地区电厂主厂房夏季采用全面自然通风和自然进风、机械排风2种通风方案的可行性，对某电厂主厂房内部的流场分布情况进行了数值模拟。结果表明：夏季工况下采用全面自然通风方案时，底层和夹层的空气温度超过34.5 ℃的高温区域面积较大，不能很好地满足相关技术规程的要求；采用机械排风方案后，厂房内部温升超过3 ℃的高温区范围明显变小，各层空气流速分布更加合理；但在2种通风方案下，凝汽器附近均会形成小范围高温区，以及出现局部流速过低问题。分别通过开启通风格栅和采取隔热措施进行优化，结果表明其降温效果明显。
Abstract：
In order to determine the feasibility of two main ventilation schemes of general natural ventilation and natural air supply plus mechanical exhaust ventilation in summer for the main building of a power plant in cold zone, numerically simulates the air distribution of the main building. The results show that the bottom and interlayer parts have a high temperature area exceeding 34.5 ℃ when adopting the general natural ventilation scheme in summer, which cannot adequately meet the requirements of the relevant regulations. When adopting the mechanical exhaust scheme, the area of temperature rise exceeding 3 ℃ significantly shrinks in the plant and the distribution of air flow velocity is more reasonable. However, in the two ventilation schemes, there is a small high temperature area near the condenser and low flow rate in a certain local area. Therefore, optimizes the system by adopting ventilation grille and thermal insulation measures, which shows a remarkable temperature reduction.
Keywords:cold zone, power plant, main building, natural ventilation, mechanical exhaust, numerical simulation