300MW机组富氧煤粉燃烧锅炉离心式烟气压缩机级的运行特性分析  

Operation characteristic analysis of centrifugal flue gas compressor stage in a 300MW unit oxy-coal fired boiler

作　　者：高建强[1] 孙少东[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《热力发电》2015年第8期90-94,共5页Thermal Power Generation

基　　金：河北省自然科学基金项目(F2012502068)

摘　　要：建立了离心式压缩机级内烟气压缩过程中级的能量传递、流动损失及压比等数学模型,并以300MW机组富氧煤粉燃烧锅炉离心式烟气压缩机中压段第1级为研究对象,计算并分析了不同转速、进口烟气温度、进口烟气压力对级性能参数的影响,得到了不同工况下,级的效率、损失、等熵能量头、压比与烟气质量流量的变化关系。结果表明:稳定工况区域内,压缩机转速越高,级的损失越小,效率和压比越高且随烟气质量流量的变化幅度越大,性能曲线越陡;相对进口烟气压力,进口烟气温度对级参数的影响较大。建议在压缩机中间增设冷却器,控制进口烟气温度,以提高级的效率。The mathematic model for relationship between and among energy transfer,flow loss and pressure ratio in stages of centrifugal compressor during compression was established.Taking the stages in centrifugal flue gas compressor of a 300 MW unit oxy-coal fired boiler as the example,the effects of rotation speed,inlet gas temperature and pressure on the stage performance parameters were investigated.The corresponding relationship between mass flow rate and the stage efficiency,flow loss,equivalent entropy head and pressure ratio was obtained,under different working conditions.The results show that,under stable working conditions,with an increase in the rotation speed,the stage flow loss decreased,the stage efficiency and pressure ratio increased and the stage performance curve became steeper.The inlet flue gas temperature affected more on the stage parameters comparing with the inlet pressure.It suggests that a cooler should be located in the middle of the compressor to control the inlet flue gas temperature thus to enhance the stage efficiency.

关 键 词：300 MW机组 锅炉 富氧燃烧 离心式 烟气压缩机 转速 级参数 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]