PDF《1 000 MW 宽负荷超超临界机组锅炉 水动力特性计算及分析》

第48 卷第4期热力发电Vol.

48 No.4

2019 年4月THERMAL POWER GENERATION Apr.

2019 收稿日期:2018-09-10 第一作者简介:滕敏华(1969―),男,高级工程师,主要研究方向为热力性能试验和燃烧调整技术,[email protected].

1 000 MW 宽负荷超超临界机组锅炉 水动力特性计算及分析 滕敏华

1 ,胡卿1,万 李2,吴剑波

1 ,蒋慧卿

2 ,欧阳诗洁

2 ,杨冬2(1.浙江浙能技术研究院有限公司,浙江 杭州 311121;

2.西安交通大学动力工程多相流国家重点实验室,陕西 西安 710049) [摘要]针对

1 000 MW 高效宽负荷率超超临界机组锅炉结构特点,将水冷壁划分为由流量回路、 压力节点和连接管组成的流动网络系统.根据质量守恒方程、动量守恒方程、能量守恒方 程,建立了超超临界垂直管圈锅炉水冷壁水动力计算模型.利用牛顿弦割法求解非线性模 型得到了锅炉在 BMCR 负荷、75%THA 负荷和 30%THA 负荷下的流量分配、炉膛出口汽 温及水冷壁金属壁温分布情况.计算结果表明:各负荷下,壁温和鳍片温度在材料许可范 围内,该采用垂直管圈的超超临界机组锅炉水冷壁在水动力方面安全可靠;

30%THA 负荷 时水冷壁不会发生流动不稳定性. [关键词]宽负荷;

调峰;

超超临界;

水冷壁;

流动网络法;

水动力计算;

不稳定性;

清洁燃烧 [中图分类号]TK223.3 [文献标识码]A [DOI 编号]10.19666/j.rlfd.201809193 [引用本文格式]滕敏华, 胡卿, 万李, 等.

1 000 MW 宽负荷超超临界机组锅炉水动力特性计算及分析[J]. 热力发电, 2019, 48(4): 60-67. TENG Minhua, HU Qing, WAN Li, et al. Calculation and analysis on hydrodynamic characteristics of an ultra-supercritical unit boiler with

1 000 MW broad regulation load[J]. Thermal Power Generation, 2019, 48(4): 60-67. Calculation and analysis on hydrodynamic characteristics of an ultra-supercritical unit boiler with

1 000 MW broad regulation load TENG Minhua1 , HU Qing1 , WAN Li2 , WU Jianbo1 , JIANG Huiqing2 , OUYANG Shijie2 , YANG Dong2 (1. Zhejiang Energy Group R&

D Institute Co., Ltd., Hangzhou 311121, China;

2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi'

an Jiaotong University, Xi'

an 710049, China) Abstract: According to the structural character of an ultra-supercritical

1 000 MW unit boiler with high frequency and broad regulation load, the water system can be equivalent to a network system consisting of flow circuits, pressure grids and connecting tubes. On the basis of the mass conservation equation, momentum conservation equation and energy conservation equation, the hydrodynamic calculation model of water wall of the ultra-supercritical vertical tube coils boiler is established. By using the Newton'

s chord cutting method, the nonlinear model is solved, and the mass flux distribution, outlet vapor temperatures and metal temperatures at BMCR, 75%THA and 30%THA load are obtained. The results show that, the temperature of the wall and fin is within the allowable range of materials and the water wall of the ultra-supercritical vertical tube coils boiler is safe and reliable in hydrodynamic aspect. The water wall will not flow instability at 30% THA load. Key words: broad regulation load, peak regulation, ultra supercritical, water wall, flow network method, hydrodynamic calculation, flow instability, clean combustion 近年来,随着居民用电和商业用电比重的不断 增加,我国电网负荷峰谷差迅速增大,使原本按照 基本负荷设计的