中国电力 ›› 2015, Vol. 48 ›› Issue (12): 74-78.DOI: 10.11930/j.issn.1004-9649.2015.12.74.4

• 发电 • 上一篇    下一篇

1 000 MW超超临界机组带可调节级的十级回热系统设计和经济性分析

徐红波, 陈青   

  1. 中国能源建设集团浙江省电力设计院有限公司,浙江 杭州 310012
  • 收稿日期:2015-10-14 出版日期:2015-12-18 发布日期:2015-12-30
  • 作者简介:徐红波(1971—),女,浙江宁波人,高级工程师,从事大型燃煤发电机组节能增效研究。E-mail: xu_hongbo2003@163.com

Design and Economic Analysis of Adjustable Ten-Stage Heat Regeneration System for 1 000-MW Ultra-Supercritical Unit

XU Hongbo, CHEN Qing   

  1. Zhejiang Electric Power Design Institute, Hangzhou 310012, China
  • Received:2015-10-14 Online:2015-12-18 Published:2015-12-30

摘要: 针对神华国华永州发电厂一期(2×1 000 MW)工程一次再热机组采用带可调节级10级回热系统的可行性和经济性进行了深入的论证和分析:采用串联方式将新增的0号高压加热器(以下简称高加)布置在前置蒸汽冷却器的上游,设置调节阀调节抽汽压力为0号高加供汽,在部分负荷工况下,相比常规型不可调节级的10级回热系统,0号高加的蒸汽压力得到了提高,给水温度可进一步提升;热耗下降12~38 kJ/(kW·h),煤耗降低效果显著,2台机组20年综合折现收益约5 308万元,具有更高的热经济性。

关键词: 火力发电机组, 超超临界, 十级回热, 热耗率, 煤耗率

Abstract: In this paper, the in-depth study is conducted on the feasibility and economics of the adjustable ten-stage heat regeneration system for the two 1 000-MW ultra-supercritical units with one reheat cycle in Shenhua Guohua Yongzhou Power Plant (2×1 000 MW) Phase I Project. The serial No.0 high-pressure heater, equipped with the control valve to regulate the extraction pressure, is placed upstream the outer steam cooler. Under the partial load conditions, compared with the ten-stage heat regeneration system with nonadjustable stage, the initial steam pressure of the No.0 HP heater and the feedwater temperature are both improved, which lowers the turbine heat rate by 12~38 kJ/kWh, showing significant decrease of coal consumption. As a result, the total comprehensive benefit of the two units in 20 years can be as much as 53.08 million yuan.

Key words: thermal generation unit, ultra-supercritical unit, ten-stage heat regeneration system, heat rate, coal consumption

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