全路吸收式回热循环在热电联产中的应用

发布时间：2018-01-18 00:02

本文关键词：全路吸收式回热循环在热电联产中的应用　出处：《中国石油大学(华东)》2014年硕士论文　论文类型：学位论文

【摘要】：目前我国北方的热电联产集中供热不同程度地面临着热源供热能力不足和管网输送能力不足的问题。本文结合山东某电厂热电联产集中供热的现状,采用基于全路吸收式回热循环的热电联产集中供热技术,对用户热力站和电厂热网首站进行供热改造。在热力站处安装第一类吸收式热交换器,替代水-水热交换器,利用蕴涵于一、二次网之间大温差换热的可用能,大幅度降低一次网回水温度;在电厂供热首站安装单效-双效回热第一类吸收式热泵,以汽轮机供暖抽汽驱动,回收电厂循环水余热,完成一次网的全热泵加热。本文详细介绍了全路吸收式回热循环的工作流程及热力计算方法,并编制了热力计算程序。对全路吸收式回热循环进行了性能分析,分析了二次网供回水温度、一次网供水温度、回热度、循环水出口温度、汽轮机抽汽压力对全路系统参数的影响;同时对系统在室外温度变化时的运行状况进行了分析,该系统在实际运行时一次网与二次网均采用集中质调节方式进行供热调节,并采用无因次公式法绘制热负荷延续时间图。本文从节能效益、经济效益和环境效益三个方面入手,对全路吸收式回热系统进行评价分析。分析表明,基于全路吸收式回热循环的热电联产集中供热技术可回收循环水余热,提高电厂的供热能力;可提高热网的输送能力,解决管网输送能力不足的问题;可减少电厂循环冷却水的蒸发量,节约水资源。
[Abstract]:At present, the heat and power cogeneration central heating in the north of China is faced with the problems of insufficient heat source heating capacity and insufficient pipe network transportation capacity to varying degrees. This paper combines the current situation of heat and power cogeneration centralized heating in a power plant in Shandong Province. In this paper, the heat and power cogeneration central heating technology based on all-circuit absorption regenerative cycle is adopted, and the first kind of absorption heat exchanger is installed at the heating station where the heating station and the first station of the power plant are heated. Instead of water-water heat exchanger, using the available energy of large temperature difference heat transfer between primary and secondary networks, the backwater temperature of primary net is greatly reduced. The first kind of absorption heat pump is installed in the first station of power plant heating, which is driven by steam turbine heating to recover the waste heat of circulating water in power plant. In this paper, the working flow and thermodynamic calculation method of full-circuit absorption regenerative cycle are introduced in detail, and the thermodynamic calculation program is compiled. The performance of full-circuit absorption regenerative cycle is analyzed. The effects of secondary network backwater temperature, primary net water supply temperature, reheat degree, circulating water outlet temperature and steam turbine extraction pressure on the parameters of the whole circuit are analyzed. At the same time, the operating condition of the system in the outdoor temperature change is analyzed. The primary network and the secondary network both adopt the centralized quality regulation method to regulate the heat supply in the actual operation of the system. The method of dimensionless formula is used to draw the diagram of heat load duration. This paper evaluates and analyzes the whole circuit absorption regenerative system from three aspects: energy saving benefit, economic benefit and environmental benefit. The heat and power cogeneration central heating technology based on the whole circuit absorption regenerative cycle can recover the waste heat of circulating water and improve the heat supply capacity of power plant. It can improve the transportation capacity of heat network and solve the problem of insufficient transportation capacity of pipe network. It can reduce evaporation of circulating cooling water in power plant and save water resources.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU995

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