Details

Autor(en) / Beteiligte

• Lee, Jongjun
• Kim, Kyung Min
• Im, Shinyoung
• Shin, Sang Ho
• Chang, Won Seok
• Oh, Mun Sei

Titel

A study on the variation of the performance and the cost of power generation in a combined heat and power plant with the change of the user facility’s return temperature

Ist Teil von

• Journal of Mechanical Science and Technology, 2020, 34(2), , pp.905-915

Ort / Verlag

Seoul: Korean Society of Mechanical Engineers

Erscheinungsjahr

2020

Quelle

SpringerLink

Beschreibungen/Notizen

• A combined heat and power (CHP) system generates electricity from thermal energy and generates heat by utilizing the remaining thermal energy. The system efficiency of the cogeneration system is 75–85 %, which is very high compared to existing only power generation facilities, so it is very useful for energy conservation and environmental protection. For this reason, interest in the cogeneration system is increasing worldwide. Generally, a cogeneration plant consists of a steam turbine alone or the combined power generation of a gas turbine and a steam turbine depending on the scale. The steam turbine is divided into a back-pressure type turbine and a condensing type turbine depending on the operational methodology of the steam turbine. In both cases, the shift in the return temperature of the district heating users influences the performance of the cogeneration plant, thus affecting the power generation costs of the power plant. It is possible to accurately estimate the change in the unit cost of the power generation caused by these changes, and to inflict it on the user, thereby changing the usage pattern of the user and reducing the energy consumption accordingly. In this study, the commercial combined cycle cogeneration system using back - pressure type turbine was simulated, and the change of performance of the combined heat and power plant was analyzed while changing the user facility’s total return temperature. Based on the results of this analysis, a possible loss in the plant according to the change of return temperature was predicted. Also the effect of each user’s return temperature on the plant loss was analyzed using an actual user’s return temperature data. The economic-mechanical approach, such as this study, can alleviate dissatisfaction with the user’s charge and to consume energy in a more rational way. It eventually can play a role in reducing carbon emissions.