The new ways to increase the efficiency of thermal hydraulic processes in systems of separation and reheating of NPP wet steam turbines

Mikle Egorov,Nataliya Lavrovskaya,Irina Krectunova,Nadezhda Litvinova,Ivan Kovalenko,Ivan Kasatkin,A. Drozdov

doi:10.1051/e3sconf/202017801029

Abstract

Systems of moisture separators - reheaters (SMSR) were created simultaneously with the powerful turbines development of nuclear power plants operating on a wet steam from the early 60s of the 20th century. This lengthy experience made the opportunity to identify the moisture separators - reheaters (MSRs) drawbacks, to determine the objectives for their design and computation improvement in order to increase thermodynamic efficiency, MSR devices and MSR systems reliability in general. Based on maintenance experience and results of our and other researchers’ model and field studies this article discusses potential ways of further development and improvement, taking into consideration both SMSR components (separation and reheating) under conditions of their flow in one apparatus.

Highlights

The moisture separation and reheating organisation of low-pressure steam in turbine units of nuclear power plants with water-cooled reactors is the problem, appeared with the steam turbines creation operating on saturated steam, i.e. simultaneously with the large-scale nuclear power advent in the USSR and in other countries [1]
We present below some factors analysis, emphasizing factors detected during long-term operation at Russian NPPs with boiling reactors such as RBMK1000 with Systems of moisture separators - reheaters (SMSR)-500-1
Poor quality of separator removal leads to the abovementioned possibility of contact with the reheater tubes, which is especially characteristic for devices with an upper separation part (SMSR-220-1, SMSR-500, SMSR500-1, SMSR-1000)

Summary

Introduction

The moisture separation and reheating organisation of low-pressure steam in turbine units of nuclear power plants with water-cooled reactors is the problem, appeared with the steam turbines creation operating on saturated steam, i.e. simultaneously with the large-scale nuclear power advent in the USSR and in other countries (in early 1960s) [1]. The steam parameters are significantly lower than the standard reheated steam parameters of used in organic fuels power engineering This does not apply to nuclear power installations with supercritical parameters that are promising, but have not been implemented yet. When steam reaches the so-called separation pressure, the steam is sent to special devices – moisture separators-reheaters (MSRs) [2,3,4,5]. They separate moisture from the steam and overheat the dried steam to a temperature that ensures reliable operation of the LP part. Two-stage overheating is the most common at MSR of Soviet (Russian) design: in the first stage, due to the heat of the condensing steam withdrawn from the turbine's turbocharger, and in the second stage, due to the heat of the hot steam in front of the turbine

Methods

Results

Conclusion