本文關(guān)鍵詞： 集中供熱 分布式變頻系統(tǒng) 供熱管網(wǎng) 循環(huán)泵　出處：《天津大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：系統(tǒng)能效的提高和輸配能耗的降低，是集中供熱系統(tǒng)節(jié)能重要的組成部分，，其研究已經(jīng)日益引起廣泛的重視。分布式變頻集中供熱系統(tǒng)被認(rèn)為是一種能夠有效降低輸配能耗、提高集中供熱服務(wù)質(zhì)量和節(jié)能水平的一種新的集中供熱系統(tǒng)形式。通過(guò)理論分析與實(shí)驗(yàn)研究，本文對(duì)分布式變頻集中供熱系統(tǒng)的水力工況和熱力工況的動(dòng)態(tài)特征、系統(tǒng)運(yùn)行的穩(wěn)定性等問(wèn)題進(jìn)行了分析與研究。 分布式變頻集中供熱系統(tǒng)的水力工況分析的基本任務(wù)是確定各工況下系統(tǒng)壓力分布和流量分布。作為多泵并聯(lián)運(yùn)行的分布式變頻集中供熱系統(tǒng)，其工作原理與系統(tǒng)水力特性和傳統(tǒng)的集中式動(dòng)力集中供熱系統(tǒng)均有根本性的不同，尤其是循環(huán)泵的工作特性，是影響水力工況特性的根本原因，也是系統(tǒng)熱力分析的關(guān)鍵因素。在梳理和分析分布式變頻集中供熱系統(tǒng)的水力組件及其水力學(xué)特性的基礎(chǔ)上，本文構(gòu)建了水力學(xué)分析的系統(tǒng)模型，重點(diǎn)考慮了各用戶支路有變頻回水加壓泵的水力特性分析模型并給出求解方法。模型的建立和分析為實(shí)驗(yàn)研究系統(tǒng)的構(gòu)建提供了思路和理論基礎(chǔ)。也為系統(tǒng)的熱力工況分析奠定了基礎(chǔ)。 集中供熱系統(tǒng)的基本功能是實(shí)現(xiàn)熱能的合理分配并實(shí)現(xiàn)熱能的充分、合理地利用。分布式變頻集中供熱系統(tǒng)對(duì)能量的合理分配與高效利用有其獨(dú)特的優(yōu)點(diǎn)。在系統(tǒng)水力工況分析的基礎(chǔ)上對(duì)系統(tǒng)的熱力工況進(jìn)行理論分析，為正確理解分布式變頻集中供熱系統(tǒng)的能量分配機(jī)理和系統(tǒng)設(shè)計(jì)提供了理論分析工具。 本文實(shí)驗(yàn)研究分為兩個(gè)部分，一部分是實(shí)驗(yàn)室模擬系統(tǒng)的實(shí)驗(yàn)研究，另一部分是工程應(yīng)用的實(shí)驗(yàn)研究。實(shí)驗(yàn)室模擬實(shí)驗(yàn)研究部分，建立了實(shí)驗(yàn)室模擬研究系統(tǒng)并對(duì)分布式變頻集中供熱系統(tǒng)的系統(tǒng)水力工況的動(dòng)態(tài)特性進(jìn)行了較為詳盡的研究；實(shí)際工程應(yīng)用的實(shí)驗(yàn)研究部分，針對(duì)一具體工程應(yīng)用實(shí)例，對(duì)分布式變頻集中供熱系統(tǒng)的動(dòng)態(tài)熱力工況進(jìn)行了系統(tǒng)的實(shí)驗(yàn)研究。 集中供熱系統(tǒng)的運(yùn)行穩(wěn)定性是其安全、高效運(yùn)行的基礎(chǔ)。本文針對(duì)分布式變頻集中供熱系統(tǒng)，采用偏離系數(shù)法和敏感度法分析了相關(guān)因素對(duì)系統(tǒng)穩(wěn)定的影響。為系統(tǒng)的優(yōu)化設(shè)計(jì)和運(yùn)行策略的確定提供了依據(jù)。
[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.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU995

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