长输供热工程热网调节方式选择与效果分析

Selection and Effect Analysis of Heat Network Regulation Mode in Long-distance Heating Project

随着管网输配送距离的增加,供热时调节的滞后性明显、时效性也较差。以银川长输供热项目为对象,根据其四环间联的特点,研究热网调节存在的问题,发现了采用质调节存在的超长延迟性、大温差热泵机组的效率波动,在初、末寒期阶段管道应力的影响等问题。综合考虑目前常见的热网调节方式,最后决定采用分阶段定温度的变流量调节方式。通过实际运行,发现该方式具有经济节能、负荷响应速度加快和加强管网安全运行等方面的特点,有利于保障供热的质量。

With the increase of the transmission and distribution distance of the pipe network,the regulation lag is obvious,and the timeliness is poor.Taking Yinchuan long-distance heat supply project as the object,according to the characteristics of its four rings inter connection,the problems existing in heat network regulation are studied.The problems of super long delay,eff iciency fluctuation of large temperature difference heat pump unit and the influence of pipeline stress in the early and late cold period are found.Considering the common regulation methods of heat supply network at present,it is f inally decided to adopt the variable flow regulation method of phased constant temperature.Through the actual operation,it is found that this method has the characteristics of economic energy saving,accelerating load response speed and strengthening the safe operation of pipe network,which is conducive to ensuring the quality of heating.