Affiliation of Author(s):

建筑设备科学与工程学院

Journal:

Third International Conference on Applied Energy

Key Words:

中文关键字：发电厂；低压省煤器；余热利用；热力学分析；优化，英文关键字：Power generation；Low pressure economizer；Waste hea

Abstract:

The requirements for energy conservation and environmental protection can be met through maximizing energy utilization of a unit. Low pressure economizer (LPE) can be utilized to significantly recover waste heat from boiler exhaust flue gas in steam power plant. In this paper a mathematical model is established in which mass and energy balances are considered. The equivalent enthalpy drop method and the conventional heat balance method which includes input-output and heat-loss are employed in the thermodynamic and economic analysis. In case study, a 1000 MW supercritical generating unit is analyzed, 6 possible connecting schemes of the LPE system are compared. Simultaneously heat exchangers are designed correspondingly for each system. Simulation calculations are conducted to evaluate the energy saving effects quantitatively. The results show that the additional low pressure economizer can obtain considerable economic benefits by directly reducing boiler exhaust flue gas temperature, effectively improving unit efficiency, decreasing heat rate, and reducing coal consumption. It is found that there is a maximum net electrical efficiency through the comparison between different technical innovations. Further, mathematical optimization techniques are applied to search for optimal solutions in which both the investment and operation costs are taken into account. These features make the low pressure economizer system suitable both for new installations and for retrofit of existing power plants.

Note:

王欢

Co-author:

车得福

First Author:

wanghuan

Indexed by:

Journal paper

Volume:

卷：

Issue:

期：

Page Number:

页：

Translation or Not:

no

Date of Publication:

2011-05-01