Application of two-stage double-cycle flue gas waste heat utilization system

WANG Lin; NIU Kun; GAO Jinghui; ZHANG Yafu; WANG Hongyu; MENG Yingqi

doi:10.19666/j.rlfd.201809186

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Application of two-stage double-cycle flue gas waste heat utilization system

更新时间：2025-09-28

- Application of two-stage double-cycle flue gas waste heat utilization system
- Thermal Power Generation Vol. 48, Issue 5, Pages: 14-17(2019)
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201809186
  CLC： TK115
- Published Online：29 April 2019，
  
  Published：2019
- 稿件说明：
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WANG Lin, NIU Kun, GAO Jinghui, et al. Application of two-stage double-cycle flue gas waste heat utilization system[J]. Thermal power generation, 2019, 48(5): 14-17.
DOI：

WANG Lin, NIU Kun, GAO Jinghui, et al. Application of two-stage double-cycle flue gas waste heat utilization system[J]. Thermal power generation, 2019, 48(5): 14-17. DOI： 10.19666/j.rlfd.201809186.

摘要

为实现超超临界机组在宽负荷范围内依然保持较高效率的目标

提出一种低温省煤器联合暖风器形式的组合式烟气余热高效利用系统。该系统由多个分级分段布置的水-烟气换热器组成

水侧采用独立双循环加热技术

实现了锅炉排烟的深度冷却和低能级余热的高能级利用。经实际测算

烟气余热利用系统可降低机组平均煤耗2.72 g/(kW·h)

显著提高了中低负荷下超超临界机组的效率

提升了电厂的经济性。

Abstract

In order to ensure high efficiency of ultra-supercritical units in a wide load range

a combined flue gas waste heat utilization system with low temperature economizer and heater is proposed. This system consists of a number of water-flue gas heat exchangers arranged in stages and sections

and adopts independent double-cycle heating technology to realize deep cooling of boiler flue gas and high-energy utilization of low-level waste heat.The practical calculation shows that this waste heat utilization system of flue gas can reduce the average coal consumption of the unit by 2.72 g/(kW·h)

and remarkably improve the efficiency of the unit and the economy of the power plant at low loads.

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