分布式变频集中供热系统的理论与实验研究

发布时间：2018-02-28 11:43

本文关键词： 集中供热分布式变频系统供热管网循环泵　出处：《天津大学》2014年博士论文　论文类型：学位论文

【摘要】：系统能效的提高和输配能耗的降低，是集中供热系统节能重要的组成部分，，其研究已经日益引起广泛的重视。分布式变频集中供热系统被认为是一种能够有效降低输配能耗、提高集中供热服务质量和节能水平的一种新的集中供热系统形式。通过理论分析与实验研究，本文对分布式变频集中供热系统的水力工况和热力工况的动态特征、系统运行的稳定性等问题进行了分析与研究。分布式变频集中供热系统的水力工况分析的基本任务是确定各工况下系统压力分布和流量分布。作为多泵并联运行的分布式变频集中供热系统，其工作原理与系统水力特性和传统的集中式动力集中供热系统均有根本性的不同，尤其是循环泵的工作特性，是影响水力工况特性的根本原因，也是系统热力分析的关键因素。在梳理和分析分布式变频集中供热系统的水力组件及其水力学特性的基础上，本文构建了水力学分析的系统模型，重点考虑了各用户支路有变频回水加压泵的水力特性分析模型并给出求解方法。模型的建立和分析为实验研究系统的构建提供了思路和理论基础。也为系统的热力工况分析奠定了基础。集中供热系统的基本功能是实现热能的合理分配并实现热能的充分、合理地利用。分布式变频集中供热系统对能量的合理分配与高效利用有其独特的优点。在系统水力工况分析的基础上对系统的热力工况进行理论分析，为正确理解分布式变频集中供热系统的能量分配机理和系统设计提供了理论分析工具。本文实验研究分为两个部分，一部分是实验室模拟系统的实验研究，另一部分是工程应用的实验研究。实验室模拟实验研究部分，建立了实验室模拟研究系统并对分布式变频集中供热系统的系统水力工况的动态特性进行了较为详尽的研究；实际工程应用的实验研究部分，针对一具体工程应用实例，对分布式变频集中供热系统的动态热力工况进行了系统的实验研究。集中供热系统的运行稳定性是其安全、高效运行的基础。本文针对分布式变频集中供热系统，采用偏离系数法和敏感度法分析了相关因素对系统稳定的影响。为系统的优化设计和运行策略的确定提供了依据。
[Abstract]:The improvement of system energy efficiency and the decrease of transmission and distribution energy consumption are important parts of energy saving in central heating system, and their research has been paid more and more attention. Distributed frequency conversion central heating system is considered to be an effective way to reduce energy consumption of transmission and distribution. A new form of central heating system for improving the service quality and energy saving level of central heating. Through theoretical analysis and experimental study, the dynamic characteristics of hydraulic and thermal conditions of distributed frequency conversion central heating system are studied in this paper. The stability of the system is analyzed and studied. The basic task of hydraulic condition analysis of distributed frequency conversion central heating system is to determine the pressure distribution and flow distribution of the system under various operating conditions. Its working principle is fundamentally different from the hydraulic characteristics of the system and the traditional centralized power central heating system, especially the working characteristics of the circulating pump, which is the fundamental reason that affects the hydraulic performance. On the basis of combing and analyzing the hydraulic components and hydraulics characteristics of the distributed frequency conversion central heating system, the system model of hydraulics analysis is constructed in this paper. The hydraulic characteristic analysis model of variable frequency backwater pressurized pump is considered in detail. The establishment and analysis of the model provide the train of thought and theoretical basis for the construction of experimental research system, and also provide a theoretical basis for the thermal analysis of the system. The analysis of force condition lays the foundation. The basic function of the central heating system is to realize the rational distribution of heat energy and the adequacy of heat energy. Reasonable utilization. The rational distribution and efficient utilization of energy in the distributed frequency conversion central heating system has its unique advantages. Based on the analysis of the hydraulic working conditions of the system, the thermodynamic conditions of the system are theoretically analyzed. This paper provides a theoretical analysis tool for correctly understanding the energy distribution mechanism and system design of distributed frequency conversion central heating system. This paper is divided into two parts, one is the experimental research of the laboratory simulation system, the other is the experimental research of engineering application. A laboratory simulation research system is established and the dynamic characteristics of the distributed frequency conversion central heating system under hydraulic conditions are studied in detail. The dynamic thermal condition of distributed frequency conversion central heating system is studied experimentally. The operation stability of central heating system is the basis of its safe and efficient operation. The deviation coefficient method and sensitivity method are used to analyze the influence of relative factors on the stability of the system, which provides the basis for the optimal design of the system and the determination of the operation strategy.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU995

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