Next Article in Journal
Spatio–Temporal Pattern of the Urban System Network in the Huaihe River Basin Based on Entropy Theory
Next Article in Special Issue
Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation
Previous Article in Journal
Gearbox Composite Fault Diagnosis Method Based on Minimum Entropy Deconvolution and Improved Dual-Tree Complex Wavelet Transform
Previous Article in Special Issue
A Simple Thermodynamic Model of the Internal Convective Zone of the Earth
Article Menu
Issue 1 (January) cover image

Export Article

Open AccessArticle
Entropy 2019, 21(1), 19; https://doi.org/10.3390/e21010019

How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant?

1
Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, China
2
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Received: 29 November 2018 / Revised: 22 December 2018 / Accepted: 23 December 2018 / Published: 27 December 2018
(This article belongs to the Special Issue Entropy Generation and Heat Transfer)
Full-Text   |   PDF [2535 KB, uploaded 27 December 2018]   |  

Abstract

It is difficult to recover the residual heat from flue gas when supercritical carbon dioxide (S-CO2) cycle is used for a coal fired power plant, due to the higher CO2 temperature in tail flue and the limited air temperature in air preheater. The combined cycle is helpful for residual heat recovery. Thus, it is important to build an efficient bottom cycle. In this paper, we proposed a novel exergy destruction control strategy during residual heat recovery to equal and minimize the exergy destruction for different bottom cycles. Five bottom cycles are analyzed to identify their differences in thermal efficiencies (ηth,b), and the CO2 temperature entering the bottom cycle heater (T4b) etc. We show that the exergy destruction can be minimized by a suitable pinch temperature between flue gas and CO2 in the heater via adjusting T4b. Among the five bottom cycles, either the recompression cycle (RC) or the partial cooling cycle (PACC) exhibits good performance. The power generation efficiency is 47.04% when the vapor parameters of CO2 are 620/30 MPa, with the double-reheating-recompression cycle as the top cycle, and RC as the bottom cycle. Such efficiency is higher than that of the supercritical water cycle power plant. View Full-Text
Keywords: S-CO2 coal fired power plant; combined cycle; thermodynamics; exergy destruction; residual heat of flue gas S-CO2 coal fired power plant; combined cycle; thermodynamics; exergy destruction; residual heat of flue gas
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Sun, E.; Hu, H.; Li, H.; Liu, C.; Xu, J. How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant? Entropy 2019, 21, 19.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Entropy EISSN 1099-4300 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top