Abstract
The article presents the results of the study of technical and economic parameters of power unit’s operation under reduced turbine generator loading, related to the night power dip and wear of power plant units. Changes in fuel consumption under reduced loading, change in power unit efficiency and change in main specific characteristics of the power unit were investigated. Conclusions on the 300 MW power unit’s operation modes under different turbo-generator loads were drawn based on the results of the calculations and investigations.
Highlights
Condensational thermal power plants (CTPP) and nuclear power plants (NPP) of installed power constitute a great part of Russian Unified Energy System
The power equipment of the TPP operates at reduced initial steam parameters, which leads to a decrease in the rated capacity of power units, and as a result, of the whole power plant efficiency [1]
The decrease in steam parameters is due to the fact that the main equipment of modern thermal power plants, especially those operating on solid fuel, is heavily worn out
Summary
Condensational thermal power plants (CTPP) and nuclear power plants (NPP) of installed power constitute a great part of Russian Unified Energy System. Among the power plants with an installed capacity of over 1000 MW, the most of the CTPP (67-68%) operate with an efficiency not exceeding 40% This is mainly due to the loss of heat carried away by the waste gases, along with the combustion products, the spent circulating water necessary for the complete condensation of steam in the turbine, as well as with a decrease in the operating parameters of the steam at the turbine input [2]. Electricity consumption decreases, the so-called night power dip, which leads to the necessary natural decrease in the power unit load This affects the efficiency of the turbine unit [4]
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