【摘要】 以600MW亚临界空冷火电机组为例,介绍了环境温度、环境风速、机组负荷变化等因素对机组背压的影响及存在的问题。在研究直接空冷和间接空冷冷却特点的基础上,首次提出蓄冷冷却方式,并通过对直接空冷、间接空冷和蓄冷冷却方式进行多元耦合,形成了一种先进的火电机组零水耗多元耦合冷端冷却节能提效技术。经过对该技术实施方案的优化,计算验证了环境风速和温度等对空冷火电机组背压的影响。计算结果表明这种零水耗冷端冷却提效技术,使得整个机组背压降低显著,为我国北方富煤缺水地区火电机组空冷系统设计和改造提供重要选择。更多还原

【Abstract】 Taking 600MW subcritical air-cooled thermal power unit as an example,this article analyzes the factors on the actual operation of the cold end of the unit and the problems,such as ambient temperature,wind speed,load changes,etc.Based on the detailed study of direct and indirect air cooling and cooling characteristics,the storage cooling mode is proposed firstly,through the multiple coupling of the direct air cooling,indirect air cooling and cold storage cooling method,a thermal power unit advanced zero water consumption multi coupling cooling energy efficiency technology is formed.After the implementation of the optimization technology,a cold end system variable condition mathematical model is established,and the influence of the ambient wind speed and temperature on the back pressure of the air-cooled thermal power unit is verified.The calculation results show that the zero cooling water consumption and mention efficiency technology,making the entire unit back pressure decreased significantly and provides an important choice for the design and reconstruction of the air-cooling system of the thermal power unit in the coal-rich and water-deficient areas of northern China.更多还原