Influence of the Operation of the Power Units of Thermal Power Plants in the Maneuvering Mode on the Aging Rate of Power Equipment

Abstract

A peculiar feature of the power engineering in Ukraine is a shortage of maneuvering powers; therefore the Nuclear Power Plants available in Ukraine have to use pulverized-coal blocks designed for the basic operation to meet peak loads and for the control on the whole. The current state of power generating equipment was analyzed in compliance with the normative documents approved by the Ministry of Power Engineering and Fuel Industry of Ukraine. The influence of the operation of power units of 200-300 MW in the maneuvering mode has been studied and the predicted residual life in the normal operation mode and in the maneuvering mode of daily start-stop has been calculated. The ageing rate indicators have been calculated and it was established that the equipment aging rate in the maneuvering mode increases three to eight times in comparison with that at the normal operation. It was established that the operation in this mode requires the normative substantiation: the key parameters and criteria of operating conditions should be defined, the software for the technical diagnostics should be introduced, and the additional control (examination) of the technical state of power equipment should be arranged and exercised and the obtained results must be processed. The measures should be taken to provide the safe operation and exercise control over the aging of power plants during the reassigned operation life. Due to this fact and taking into consideration the current state of the equipment the operation in the maneuvering mode in undesirable and requires the development of special normative base, because the available key assets are subjected to a considerable wear.

Analysis of the Opportunity to Extend the Operation of the Intermediate Pressure Rotor with Critical Size Cracks

“…Поточне напрацювання основного генеруючого обладнання ТЕС перевищує паркове значення в 1,2-1,5 рази [2]. Також стан обладнання ТЕС ускладняється тим фактом, що з-за недостачі пікових потужностей в балансовому співвідношенні енергетичного вироблення, велика кількість пиловугільних електростанцій переводиться в маневрені режими роботи [3].…”

Development of a system for estimating and forecasting the rational resource-saving operating modes of TPP

“…The influence of frequent variable operation modes of the TPP pulverized coal units on the durability of their performance was investigated in paper [15]. However, the authors did not address the optimization of the operating modes of power units to prevent the premature wear of TPP generating equipment under operation at the peak and half-peak parts of load schedule.…”

Development of a technological approach to the control of turbine casings resource for supercritical steam parameters

“…An increase in the share of electricity generation at nuclear power plants leads to the gradual TPP pushing to semi-peak and peak parts of the daily load schedule. This factor requires a more detailed analysis of resource indicators of power equipment for prevention of premature wear [1]. Identification of major aspects of this problem and a decrease in the influence of factors of accelerated completion of service life are at the heart of the problem of resource control of power equipment.…”