新型小汽机耦合多级蒸汽引射器供热系统及性能分析  

A New Type of Coupled Multistage Steam Ejector Heating System for Small Steam Turbine and Its Performance Analysis

作　　者：邓庚庚 周家辉 周天羽 徐钢[1] 刘文毅[1] 王永旭[2] DENG Genggeng;ZHOU Jiahui;ZHOU Tianyu;XU Gang;LIU Wenyi;WANG Yongxu(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;Tongliao Power Plant Co.,Ltd.,Tongliao 028000,Inner Mongolia Autonomous Region,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206 [2]通辽发电总厂有限责任公司,内蒙古通辽028000

出　　处：《动力工程学报》2023年第2期222-230,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金创新研究群体资助项目(51821004)。

摘　　要：提出一种新型热电联产机组小汽机耦合多级蒸汽引射器供热系统,实现了对供热抽汽的能量梯级利用,以降低热电联产机组直接抽汽供热带来的蒸汽品质浪费以及机组冷端损失。机组一部分供热抽汽通过并联蒸汽引射器系统引射机组排汽,两者混合后对热网水进行两级加热;另一部分蒸汽进入背压小汽机做功后,进入耦合热网换热器加热热网回水,使其达到规定的热网供水温度。以某330 MW热电联产机组为研究对象,通过EBSILON 15.0软件对系统进行精准建模计算,并进行了详细的系统热力性能分析和经济性分析。结果表明:相比案例系统,新系统的整体标煤耗量降低了4.18 t/h,热电联产总效率提升了3.22个百分点,发电煤耗下降15.84 g/(kW·h);新系统的年化新增收益可达570.02万元,具有较好的经济性收益。A new heating system of small steam turbine coupled multistage steam ejector for cogeneration units was proposed to realize the cascade utilization of heating extraction steam energy,and to reduce the waste of steam quality and the loss of cold end caused by direct extraction heating of cogeneration units.Part of the heating extraction steam ejected the exhaust steam of the unit through the parallel steam ejector system.After the mixing of the heating extraction steam and the exhaust steam,the water of the heat network was heated in two stages.While the other part of steam entered the back pressure small steam turbine to do work,then entered the coupled heat network heater to heat the heat network backwater,so that it reached the specified heat network water supply temperature.Taking a 330 MW cogeneration unit as the research object,EBSILON 15.0 software was used for accurate modeling calculation of the system,and the detailed thermal performance and economic analyses of the system were carried out.Results show that compared with the case system,the overall standard coal consumption and the power generation coal consumption of the new system were reduced by 4.18 t/h and 15.84 g/(kW·h) respectively,and the total cogeneration efficiency is increased by 3.22%.The annualized new gains of the new system can reach 5.700 2 million yuan,indicating that the new system has good economic gains.

关 键 词：热电联产机组 蒸汽引射器 系统耦合 性能分析 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]