摘要
对德国GEA公司逆流式自然通风冷却塔控制技术中存在的问题进行了研究,提出了改进措施,首先针对二位制运行闸板阀会造成冷却塔出水温度呈锯齿形变化,导致发电效率下降,煤耗增加,经济性较差的问题,将原二位制运行闸板阀控制方式改为连续型调节方式;其次为了实现冷却塔的全程自动控制将冷却塔出水温度设定值改为自动调整;最后为了解决冷却塔冷却水温度控制中存在的大滞后、大惯性问题,采用带死区的前馈PID策略并结合预测控制思想,通过上述的改进,可以实现冷却塔节能优化全程控制,降低发电煤耗,提高机组运行的可靠性、经济性和安全性。
The problems in control technology of counter-flow natural draft cooling tower of German GEA Company are studied, and improvement measures are proposed. Firstly, for the problems of decreasing efficiency of power generation, increasing coal consumption and poor economy due to the jagged changes of outlet water temperature of cooling tower caused by two-system gate valve, the original control mode of two-system gate valve system was transformed to continuous adjustment mode; Secondly, in order to achieve full automatic control of cooling tower, the set value of outlet water temperature of cooling tower was changed to automatic adjustment; Finally, in order to solve the problem of large lag and great inertia in temperature control of Cooling water of cooling tower, the pre-fed PID strategy with dead zone was used and of the idea of predictive contmi was Combined with. By these improvements, the entire-process control of energy-saving optimization of cooling tower can be achieved, which can reduce the coal consumption, and improve the reliability, economy and safety of unit operation.
出处
《能源与节能》
2014年第10期85-86,105,共3页
Energy and Energy Conservation
关键词
GEA冷却塔
发电厂
防冻
闸板阀
全程控制
经济性
GEA cooling tower
power plant
antifreeze
gate valve
entire-process control
economy
