Simulation for Off-Design Performances of Flue Gas Pre-Dried Lignite-Fired Power System

doi:10.7652/xjtuxb201501005

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Simulation for Off-Design Performances of Flue Gas Pre-Dried Lignite-Fired Power System

更新时间：2025-07-09

- Simulation for Off-Design Performances of Flue Gas Pre-Dried Lignite-Fired Power System
- Vol. 49, Issue 1, Pages: 27-33(2015)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201501005
  CLC： TK11
- Online First：10 January 2015，
  
  Published：2015
- 稿件说明：
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Simulation for Off-Design Performances of Flue Gas Pre-Dried Lignite-Fired Power System[J]. 2015, 49(1): 27-33.
DOI：

Simulation for Off-Design Performances of Flue Gas Pre-Dried Lignite-Fired Power System[J]. 2015, 49(1): 27-33. DOI： 10.7652/xjtuxb201501005.

摘要

针对褐煤烟气预干燥发电系统的变工况特性建立了全厂机炉耦合仿真模型

在设计工况下校核了模型的精度。对比发现:烟气预干燥可使600 MW机组的发电效率绝对值提高1.56%

发电标准煤耗率降低9.58 g·(kW·h)

-1

。在不同的发电功率和褐煤预干燥程度下仿真了系统的变工况特性

分析了锅炉主要运行参数和机组发电标准煤耗率的变化规律

结果表明:发电标准煤耗率随发电功率的下降而上升; 在不同的发电功率下

预干燥程度对锅炉运行参数和发电标准煤耗率影响显著

随着预干燥程度的减小

理论燃烧温度下降

高温炉烟抽取率下降

锅炉排烟温度上升

锅炉效率下降

发电标准煤耗率上升。

Abstract

To investigate off-design characteristics of the lignite-fired power system integrated with flue gas drying

a whole-system boiler-turbine coupling simulation model is developed. The model is verified with the parameters under design conditions. It is found that flue gas pre-dried lignite-fired power system is endowed with remarkable energy-saving potential compared with the conventional lignite-fired power system. The plant thermal efficiency of a 600 MW unit increases by 1.56%(absolute variation)under design condition

and the standard coal consumption rate decreases by 9.58 g·(kW·h)

-1

accordingly. The off-design characteristics are simulated with variable power loads and lignite pre-drying degrees. The variation tendencies of the boiler operating parameters and system standard coal consumption rate ar

e analyzed. The simulation shows that with the decreasing power load

the standard coal consumption rate increases; with the decreasing pre-drying degree

the theoretical combustion temperature and hot flue gas extracting ratio decrease

and the boiler exhaust temperature increases

which lead to a decreasing boiler thermal efficiency and an increasing coal consumption rate.

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references

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