摘要
采用直流设计的配H级联合循环机组的余热锅炉高压蒸发器(简称高压直流蒸发器),在水动力特性上与传统余热锅炉存在较大的区别。基于流动网络系统法,将高压直流蒸发器系统等效为由流量回路、压力节点和连接管组成的流动网络系统。根据质量守恒、动量守恒和能量守恒定律建立了流量分配计算模型。根据开口螺旋鳍片管的结构特点,建立了壁温计算模型。在此基础上,对高压直流蒸发器额定负荷下的水动力特性进行了计算分析。计算结果表明:高压直流蒸发器各部分的压降分布较为合理;蒸发器1由于出口处工质处于两相区,各回路的出口工质温度非常一致,蒸发器2处于同一入口集箱和出口集箱的管束最大汽温偏差为12.8℃;蒸发器1和蒸发器2的壁温均处于管子材料的允许温度范围之内,能够保证锅炉的安全运行。
The high-pressure once-through evaporator of a heat recovery steam generator(HRSG)in an H-class gas turbine(hereinafter called HP once-through evaporator)is quite different from the traditional one in thermal-hydraulic characteristics.Based on the flow network system method,the HP once-through evaporator system is equivalent to a flow network system consisting of flow circuits,pressure nodes and connecting pipes.According to the conservation of mass,conservation of momentum and conservation of energy,the calculation model of flow distribution was established.According to the structural characteristics of the spiral finned tube,a wall temperature calculation model was established.Then the thermal-hydraulic characteristics of the HP once-through evaporator at rated load was calculated and analyzed.The calculation results show that the pressure drop distribution of each HP once-through evaporator section is reasonable.Since the outlet is in a two-phase zone,the outlet working fluid temperature of the evaporator 1 is very consistent.For the evaporator 2,the maximum steam temperature deviation of the tube bundle between the same inlet header and outlet header is 12.8℃.The wall temperatures of evaporator 1 and evaporator 2 are within the allowable temperature range of the tube material,which can ensure the safe operation of the boiler.
作者
郭琴琴
阳开应
董乐
杨冬
GUO Qinqin;YANG Kaiying;DONG Le;YANG Dong(Shanghai Boiler Works Co., Ltd., Shanghai 200245, China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University, Xi’an 710049, China)
出处
《锅炉技术》
北大核心
2021年第3期8-13,共6页
Boiler Technology
基金
上海市科技人才计划项目(18XD1421400)。
关键词
H级
余热锅炉
直流蒸发器
水动力特性
流量分配
壁温计算
H-class
heat recovery steam generator
once-through evaporator
thermal-hydraulic characteristics
flow distribution
wall temperature calculation
