Affiliation of Author(s):

建筑设备科学与工程学院

Journal:

Applied Thermal Engineering

Key Words:

中文关键字：余热利用；液化天然气；氨水混合物；热力学分析；优化，英文关键字：Waste heat recovery；LNG；Ammoniaewater mixture；Ther

Abstract:

This paper deals with the optimization of a novel combined power system, which can effectively recover low-temperature waste heat and fully utilize the cold energy of LNG as well, based on the first thermodynamic law and the second thermodynamic law respectively. Parametric analysis has been performed to study the effects of heat source temperature, ammonia turbine inlet pressure, LNG turbine inlet and outlet pressures, as well as ammonia mass fraction of basic solution. The simulation results show that the system performance can be improved by applying optimization techniques. The optimization is conducted under a certain set of constraints by using the differential evolution (DE) algorithm to maximize the first and the second law efficiency respectively. Through parallel direct search over the whole feasible region, it is found that a maximum first law efficiency of 39.33% can be obtained when variable vector V1 = [423.70 K, 1.8 MPa, 3.904 MPa, 0.3 MPa, 0.52]; while a maximum second law efficiency of 55.62% can be obtained when variable vector V2 = [423.93 K, 1.874 MPa, 3.493 MPa, 0.8 MPa, 0.48]. In addition, the irreversibilities in various components of the cycle under typical operating conditions and exergy efficiency optimum condition have been compared through detailed exergy analysis.

Note:

王欢

Co-author:

史晓军,车得福

First Author:

wanghuan

Indexed by:

Journal paper

Volume:

卷：59

Issue:

期：1-2

Page Number:

页：490-497

Translation or Not:

no

Date of Publication:

2013-06-01