摘要
针对存在零压差点的集中供热系统,利用一维流体仿真软件Flowmaster进行了泵-阀调控模式的动态模拟仿真.模拟过程中,通过对典型换热站流量变化、水压图变化,以及变零压差点调节时泵阀切换过程的规律总结,对比分析了变零压差点和定零压差点运行调节工况的水力特性.同时对运行调节前后主循环泵和分布式变频泵的效率、功率及运行频率进行对比分析.结果表明:与变零压差点运行工况相比,定零压差点运行工况时,全网流量下降平缓,供回水压差波动较小,主循环泵和分布式变频泵降频后都可以保持在高效点运行,更为节能,调节方式简单易行.
A one-dimensional fluid simulation software Flowmaster was used to simulate the pump-valve control mode for the centralized heating system with zero-pressure difference point.Through the rule of flow changes of the typical heat transfer station,of water pressure changes during the process of dynamic simulation,as well as the dynamic simulation of switching process of pump-valve in the adjustment of variable zero-pressure-difference-point,we have analyzed and compared the hydraulic characteristics under the adjustment condition between the variable zero-pressure-difference-point and the constant zero-pressure-difference-point.At the same time,the efficiency,power and operating frequency of the main circulating pump and distributed pump before and after the operation are compared and analyzed.The results show that the flow rate of the whole network is flat and the pressure fluctuation of the whole network is small,and the main circulating pump and the distributed pump can be kept in high efficiency,thus making the constant zero-pressure-difference-point operation more energy-efficient along with the simple and easy adjustment method when compared with the variable zero-pressure-difference-point operating conditions.
作者
刘春胜
孙春华
齐承英
王会军
LIU Chunsheng;SUN Chunhua;QI Chengying;WANG Huijun(School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China;Energy Investment Dingzhou Heat Limited Liability Company, Dingzhou, Hebei 073000, China)
出处
《河北工业大学学报》
CAS
2018年第1期75-81,共7页
Journal of Hebei University of Technology
基金
十三五国家重点研发计划(2016YFC0700707)
河北省自然科学基金(E2015202063)
关键词
泵-阀调控供热系统
零压差点
Flowmaster
泵阀切换
运行调节
pump valve regulating heating system
zero pressure point
Flowmaster software
switch between pump and valve
operational regulation
