Abstract
The main aim of the current work is to increase operation efficiency and reliability of moisture separator-reheaters and turbines of NPPs. As the experience from MSR-500-1 operation showed the presence of large disperse moisture leads stops of the turbine. The high wetness level of steam downstream of separating devices observed since the first years of operation. Results from tests of the modernized separator-reheaters of the first unit at the Smolensk NPP with «Powervane» louvers developed by Balcke-Durr company are presented. Results from studies on the determination of wetness of the steam at the outlet from the separating part of the MSR-14, MSR-24, which demonstrate advantages of modernized construction are discussed. Modernization of separator-reheaters of the turbines TG-1, TG-2 resulted in eliminating non-uniformity of wetness over the perimeter and height of the steam space downstream the separation units. Success in modernization was caused by arranging separate outlets for moisture depositing at the walls, bottom of the inlet chamber. According to the results of the carried out studies an average value of the wetness at the outlet of the separation units was 0.6% which is close to the design value 0.5%.
Highlights
Turbine units at nuclear power plant with reactors operating on saturated steam include intermediate moisture separator-reheaters (MSRs) [1, 2].Single-case vertical apparatuses MSR-500-1 are composed [3] – of the inlet chamber – in which wet steam flows from a high-pressure cylinder and separation of large-dispersed moisture from steam is carried out; – separating parts – here subsequent separation of moisture occurs; – superheating parts – here superheating of the dry steam to the temperature enabling operation of the low-pressure cylinder
Modernization of MSR-500-1 is based on replacing existing louvre separation devices by «Powervane» louvers developed by the Balcke-Durr company (BD)
The steam is directed from the inlet chamber to 12 separation units of A, B, C, D, E, and F type with «Powervane» louvers representing the sets of wavy lines
Summary
Turbine units at nuclear power plant with reactors operating on saturated steam include intermediate moisture separator-reheaters (MSRs) [1, 2]. Studies undertaken earlier on the determination of wetness of the heated steam in MSR showed presence of large dispersion moisture [12]. Such effects were observed at the surface of the MSR opposite to the inlet receiver and occured during operation of the turbine unit at power of approximately 300 MW. As the experience from MSR operation showed [13] the presence of large disperse moisture leads to damage in tubes distributing of the heating steam over the modulus of the first and the second stages of superheating and as a consequence to forced stops of the turbine plant [14, 15]
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