供热系统联网运行方案与水力工况分析
发布时间：2019-02-11 20:56
【摘要】：随着城市建设的飞速发展，人口的增长，在促进供热事业发展的同时，也提出了更高的要求。既要提高供热效率，又要保障供热安全性，因此构建多热源供热系统，避免因单一热源故障造成重大供热事故，是供热系统联网设计中的关键问题。 本文以石家庄市某县城在建的集中供热系统为研究对象和依托项目，介绍了供热系统的现状配置与规划，提出以连通线连接两个单热源枝状管网供热系统，同时实现近期已建成热源向两个区域的供热，以及互为备用的联网供热系统。通过对南区锅炉房停供、北区锅炉房停供和近期正常供热三个工况的讨论，同时根据供热可靠性要求兼顾近期供热需求和热源备用需求，制定了三种管线路由方案，并根据供热管网水力计算基本原理，结合多热源联网理论，确定了供热连通线和其他新建管线的管径。 根据水力计算结果，对近期由南区锅炉房向北区部分急需采暖地区供热时，，三个方案中南区水力工况的影响和北区热力站供热方案进行了论述。结果表明方案一中部分热力站应提高一次侧循环水泵扬程，改变运行工况点。方案二和方案三近期向北区供热时不影响南区现状供热管网的水力工况，南区现状供热管网零压差点与原运行工况一致，热力站的一次侧循环水泵维持原工况点。根据南区供热系统和规划北区供热系统分布式变频水泵供热系统的形式，对三种联网方案在事故工况时是否采用分布式变频水泵运行方式进行了具体的论述；对无法采用分布式变频水泵运行方式的工况，提出应增大事故备用泵的扬程，以满足热源至最不利热力站的压降要求，根据各方案特点制定了详细的事故备用泵的选型原则，事故工况的运行与调节策略。同时阐述了供热系统发生故障时的应对措施，为供热系统可靠运行提供有益的建议。 最后计算了上述三种方案供热管网的投资、工程建设其他费用和预备费等。计算结果表明方案一总投资最小，方案二和方案三总投资相等，并从投资和可靠性角度给出了三种方案的相对优劣顺序。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995
本文编号：2420096
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995
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