分布式输配供热系统扩展设计研究

发布时间：2018-11-16 19:18

【摘要】：经济突飞猛进的今天,人民对于生活品质的要求逐渐提高,我国城镇化脚步也随之加快。然而,城市热网规划对于城市发展的滞后性与不完善性,使得城市供热输配系统面临着扩展的需求。本文则主要研究分布式输配供热系统的扩展设计,并提出解决分布式输配供热系统扩展问题的多级分布式输配供热系统形式。文章首先针对变频水泵,提出反应水泵工作能力的允许运行最高扬程比概念。通过理论分析,建立数学模型,确定其影响因素。根据水泵样本,进行样本分析,定量确定平坦型与陡降型两种水泵类型的工作能力。并且提出变频水泵的选型方法,保证水泵最大工作能力的利用。通过建立热网模型,利用控制变量的方法进行系统扩展前后水力工况模拟,同时根据因素分析定性分析零压差点与热负荷接入点对分布式输配供热系统扩展前后水力工况的影响。提出供热系统最大扩展规模评价指标,针对不同分布式输配系统进行分析,得出最大扩展规模。提出多级分布式输配供热系统概念,并对系统形式进行简要阐述。同时从理论层面分析系统电耗计算方法。并通过模拟的方法对系统的节能性、分级规模和系统扩展改造的可行性进行定性定量的分析。并依据研究结论提出分布式输配供热系统扩展设计策略。以辽宁某供热管网工程为例,对系统热力站水泵扩展前后的扬程增幅比进行计算分析,指导系统改造。并计算系统扩展改造前后的电耗,证明改造方法的可行性与实用性。
[Abstract]:With the rapid development of economy today, people's demands for quality of life are raised gradually, and the pace of urbanization in our country is also accelerated. However, due to the lag and imperfection of urban heat network planning, urban heating transmission and distribution system is facing the need of expansion. This paper mainly studies the extended design of distributed transmission and distribution heating system, and puts forward a multi-level distributed heating system form to solve the problem of distributed transmission and distribution heating system expansion. In this paper, the concept of maximum allowable lift ratio of reactive pump is proposed for variable frequency pump. Through theoretical analysis, the mathematical model is established, and the influencing factors are determined. According to the water pump sample, the working ability of the flat type and the steep fall type is determined quantitatively by sample analysis. The selection method of variable-frequency pump is put forward to ensure the utilization of the maximum working capacity of the pump. By establishing the heat network model and using the method of controlling variables to simulate the hydraulic conditions before and after the system expansion, At the same time, the influence of zero pressure difference point and heat load access point on the hydraulic condition of distributed transmission and distribution heating system before and after expansion is analyzed qualitatively according to factor analysis. The evaluation index of maximum expansion scale of heating system is put forward, and the maximum expansion scale is obtained by analyzing different distributed transmission and distribution systems. This paper puts forward the concept of multi-level distributed heating transmission and distribution system, and briefly expounds the form of the system. At the same time, the calculation method of system power consumption is analyzed theoretically. The energy saving, grading scale and feasibility of system expansion and transformation are analyzed qualitatively and quantitatively by simulation method. Based on the conclusion of the research, the extended design strategy of distributed transmission and distribution heating system is put forward. Taking a heating pipe network project in Liaoning as an example, this paper calculates and analyzes the ratio of lift increase before and after the expansion of water pump in the thermal station of the system, and guides the system transformation. The power consumption before and after the expansion of the system is calculated, and the feasibility and practicability of the modification method are proved.
【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】：2017
【分类号】：TU995

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