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一、前言采用变压式氮气罐定压的高温水供热系统,运行安全可靠,操作简便,但罐体设计体积庞大。根据国外资料介绍:对连续运行的供热系统,罐体容纳系统的总膨胀水量约为系统总水容量的4％左右。对于间歇供热的系统,从间歇后开始运行的最低水温上升到设计供、回水平均温度这一过程中,水温变化所引起的水容积变化,完全应由氮气罐容纳。按此原理设计的变压式氮气罐容积就更为庞大,甚至高达系统总水容量的5～10％左右。国内有一些工程,罐体的容积也是按4％数值计算的。但实践表明:在连续和间歇运行期间,罐内水位波动的幅度大大
I. INTRODUCTION The high-pressure water heating system with variable pressure nitrogen tank constant pressure is safe and reliable to operate, and it is easy to operate. However, the tank design is bulky. According to foreign materials, the total expansion water volume of the tank containing system is about 4% of the total water capacity of the system for a continuously operating heating system. For a system with intermittent heating, the water volume change caused by the change in water temperature during the process from the minimum water temperature starting after the batch operation to the average supply and return water temperature should be completely contained by the nitrogen tank. According to this principle, the capacity of the variable pressure nitrogen tank designed to be larger is even as high as 5 to 10% of the total water capacity of the system. There are some projects in China, and the volume of the tank is also calculated by 4%. However, practice has shown that the water level fluctuations in tanks are much greater during continuous and intermittent operation.