【摘要】：隨著城市建設(shè)的飛速發(fā)展，人口的增長(zhǎng)，在促進(jìn)供熱事業(yè)發(fā)展的同時(shí)，也提出了更高的要求。既要提高供熱效率，又要保障供熱安全性，因此構(gòu)建多熱源供熱系統(tǒng)，避免因單一熱源故障造成重大供熱事故，是供熱系統(tǒng)聯(lián)網(wǎng)設(shè)計(jì)中的關(guān)鍵問題。 本文以石家莊市某縣城在建的集中供熱系統(tǒng)為研究對(duì)象和依托項(xiàng)目，介紹了供熱系統(tǒng)的現(xiàn)狀配置與規(guī)劃，提出以連通線連接兩個(gè)單熱源枝狀管網(wǎng)供熱系統(tǒng)，同時(shí)實(shí)現(xiàn)近期已建成熱源向兩個(gè)區(qū)域的供熱，以及互為備用的聯(lián)網(wǎng)供熱系統(tǒng)。通過(guò)對(duì)南區(qū)鍋爐房停供、北區(qū)鍋爐房停供和近期正常供熱三個(gè)工況的討論，同時(shí)根據(jù)供熱可靠性要求兼顧近期供熱需求和熱源備用需求，制定了三種管線路由方案，并根據(jù)供熱管網(wǎng)水力計(jì)算基本原理，結(jié)合多熱源聯(lián)網(wǎng)理論，確定了供熱連通線和其他新建管線的管徑。 根據(jù)水力計(jì)算結(jié)果，對(duì)近期由南區(qū)鍋爐房向北區(qū)部分急需采暖地區(qū)供熱時(shí)，，三個(gè)方案中南區(qū)水力工況的影響和北區(qū)熱力站供熱方案進(jìn)行了論述。結(jié)果表明方案一中部分熱力站應(yīng)提高一次側(cè)循環(huán)水泵揚(yáng)程，改變運(yùn)行工況點(diǎn)。方案二和方案三近期向北區(qū)供熱時(shí)不影響南區(qū)現(xiàn)狀供熱管網(wǎng)的水力工況，南區(qū)現(xiàn)狀供熱管網(wǎng)零壓差點(diǎn)與原運(yùn)行工況一致，熱力站的一次側(cè)循環(huán)水泵維持原工況點(diǎn)。根據(jù)南區(qū)供熱系統(tǒng)和規(guī)劃北區(qū)供熱系統(tǒng)分布式變頻水泵供熱系統(tǒng)的形式，對(duì)三種聯(lián)網(wǎng)方案在事故工況時(shí)是否采用分布式變頻水泵運(yùn)行方式進(jìn)行了具體的論述；對(duì)無(wú)法采用分布式變頻水泵運(yùn)行方式的工況，提出應(yīng)增大事故備用泵的揚(yáng)程，以滿足熱源至最不利熱力站的壓降要求，根據(jù)各方案特點(diǎn)制定了詳細(xì)的事故備用泵的選型原則，事故工況的運(yùn)行與調(diào)節(jié)策略。同時(shí)闡述了供熱系統(tǒng)發(fā)生故障時(shí)的應(yīng)對(duì)措施，為供熱系統(tǒng)可靠運(yùn)行提供有益的建議。 最后計(jì)算了上述三種方案供熱管網(wǎng)的投資、工程建設(shè)其他費(fèi)用和預(yù)備費(fèi)等。計(jì)算結(jié)果表明方案一總投資最小，方案二和方案三總投資相等，并從投資和可靠性角度給出了三種方案的相對(duì)優(yōu)劣順序。
[Abstract]:With the rapid development of urban construction and the growth of population, the development of heating industry has been promoted and higher requirements have been put forward. It is necessary to improve the efficiency of heating and to ensure the safety of heating. Therefore, it is a key problem in the design of network heating system to construct a multi-source heating system to avoid major heating accidents caused by a single heat source failure. Taking the central heating system under construction in a county town of Shijiazhuang as the research object and relying on the project, this paper introduces the present configuration and planning of the heating system, and proposes connecting two single heat source branch pipe network heating systems with connected lines. At the same time, it realizes the heat supply from the two regions and the network heating system which is backup to each other. Through the discussion of the three working conditions of boiler room shutdown, North district boiler room shutdown and short-term normal heating, and according to the requirement of heating reliability, three pipeline routing schemes are developed according to the requirement of short-term heating demand and heat source reserve demand. According to the basic principle of hydraulic calculation of heating network and combined with the theory of multi-heat source network, the pipe diameters of heating connection line and other newly built pipelines are determined. According to the results of hydraulic calculation, the influence of three schemes on the hydraulic condition of the central and southern region and the heating scheme of the north district heating station are discussed when the boiler room in the south district is in urgent need of heating in the north district. The results show that the first part of the thermodynamic station should increase the head of the primary circulating water pump and change the operating conditions. The second and third schemes do not affect the hydraulic condition of the present heating network in the Southern District when heating to the North District in the near future. The zero pressure difference point of the current heating network in the Southern District is the same as the original operating condition, and the primary side circulating water pump of the thermal power station maintains the original working point. According to the form of distributed variable frequency pump heating system in the south district heating system and the north district heating system, whether the three network schemes adopt the distributed frequency conversion pump operation mode in the accident condition is discussed in detail. In order to meet the pressure drop requirements of heat source to the most unfavorable thermal station, the operating mode of distributed variable frequency pump is proposed to increase the lift of accident standby pump. According to the characteristics of each scheme, the selection principle of accident standby pump is formulated in detail. Operation and regulation strategy of accident condition. At the same time, the measures to deal with the failure of the heating system are expounded, which provide useful suggestions for the reliable operation of the heating system. Finally, the investment, other construction expenses and reserve expenses of the above three schemes are calculated. The results show that the total investment of scheme one is the smallest, the total investment of scheme two is equal to the total investment of scheme three, and the relative order of advantages and disadvantages of the three schemes is given from the point of view of investment and reliability.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU995

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