Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units

Shidan Chi, Tao Luan, Yan Liang, Xundong Hu and Yan Gao
Additional contact information
Shidan Chi: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Tao Luan: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Yan Liang: Shandong Electric Power Engineering Consulting Institute Corp., LTD, Jinan 250061, China
Xundong Hu: Shandong Electric Power Engineering Consulting Institute Corp., LTD, Jinan 250061, China
Yan Gao: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China;

Energies, 2020, vol. 13, issue 15, 1-13

Abstract: To address the large temperature difference in the air heater (AH) inlet of a traditional exhaust heat utilization system and energy grade mismatch problems during the heat and mass transfer processes, this study proposed a new multi-level waste heat cascade utilization system. Based on a principle of “temperature-to-port and cascade utilization”, this system uses the boiler side high-temperature flue gas and low-temperature air, and the turbine side high-temperature feed water and low-temperature condensate water, to conduct cross heat exchange according to the energy grade matching principle. Combined with a typical 1000 MW coal-fired unit, the heat transfer characteristics and energy-saving benefits of the new system were analyzed. The results showed that the new system has excellent performance: the heat rate decreased by 91 kJ/kWh, coal consumption decreased by 3.3 g/kWh, and power generation efficiency increased to 49.39%.

Keywords: gradient utilization; waste heat utilization; energy saving (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/15/3969/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/15/3969/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:15:p:3969-:d:393423

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().