凝汽机组余热余压梯次利用耦合供热系统研究  

Study on Cascade Further Utilization of Residual Heat and Pressure in Coupling Heating System for Large Coal-Fired Condensers

作　　者：李军烁 沈成喆 魏书州 LI Jun-shuo;SHEN Cheng-zhe;WEI Shu-zhou(Sanhe Power Generation Co.Ltd.,Langfang,China,Post Code:065201)

机构地区：[1]三河发电有限责任公司,河北廊坊065201

出　　处：《热能动力工程》2020年第9期10-15,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：为使抽汽供热系统中的余压余热实现利用最大化,以大型燃煤凝汽机组耦合供热系统为研究对象,应用Ebsilon软件对耦合系统构建热力学模型,并进行了多变量耦合下的系统运行参数寻优。通过探讨热泵系统内部依变关系和约束条件,寻求适应不同供热负荷条件下热泵系统制热能效比(COP)最大化目标,并最终绘制了系统不同电、热负荷下的运行策略区域。结果表明:设定约束下供热功率的最大值和最小值分别为378.93和225.94 MW;热负荷低于317.576 MW时供热系统应选择背压机组功率最大原则运行,热负荷高于317.576 MW时供热系统应选择热泵功率最大原则运行;在分段运行区域内热电负荷应根据所处区域选择不同的运行策略。In order to maximize the utilization of residual pressure and residual heat in the extraction heating system,the heat supply system of large coal-fired condensing units is taken as the main research object.Using Ebsilon software to build a thermodynamic model of the coupled system,the optimization of the system operating parameters under the coupling of multiple variables is carried out.The internal dependences and constraints of heat pump system are discussed,and the maximized coefficient of performance(COP)in heat pump system under different heating loads is determined.Finally,the operation strategy areas diagram of the system under different power and thermal loads are drawn.It has been found that the maximum and minimum values of heating power are 378.93 MW and 225.94 MW under constraints condition.When the heat load is less than 317.576 MW,the principle of maximum power for backpressure turbine will be selected.When the heat load is higher than 317.576 MW,the principle of maximum power for heat pump will be selected.Different operation strategies should be selected according to the area of the thermal and power load in the segmented operation area.

关 键 词：热电联产 耦合供热 梯次利用 系统优化 

分 类 号：TM621[电气工程—电力系统及自动化] TU995[建筑科学—供热、供燃气、通风及空调工程]