Abstract
The paper presents an analysis of marine Turbo-Generator Steam Turbine (TGST) energy losses at turbine gland seals. The analyzed TGST is one of two identical Turbo-Generator Steam Turbines mounted in the steam propulsion plant of a commercial LNG carrier. Research is based on the TGST measurement data obtained during exploitation at three different loads. The turbine front gland seal is the most important element which defines TGST operating parameters, energy losses and energy efficiencies. The front gland seal should have as many chambers as possible in order to minimize the leaked steam mass flow rate, which will result in a turbine energy losses’ decrease and in an increase in energy efficiency. The steam mass flow rate leakage through the TGST rear gland seal has a low or negligible influence on turbine operating parameters, energy losses and energy efficiencies. The highest turbine energy efficiencies are noted at a high load – on which TGST operation is preferable.
Highlights
Today, by taking into account the entire world fleet, the dominant power producers for ship propulsion are marine slow speed two-stroke diesel engines [1]
This paper presents an analysis of marine TurboGenerator Steam Turbine (TGST) energy losses at gland seals
According to the Eq (9), the Turbo-Generator Steam Turbine (TGST) developed power is highly influenced by two steam mass flow rates – the first one is the steam mass flow rate at the TGST inlet and the second one is the steam mass flow rate lost through the front gland seal
Summary
By taking into account the entire world fleet, the dominant power producers for ship propulsion are marine slow speed two-stroke diesel engines [1]. This paper presents an analysis of marine TurboGenerator Steam Turbine (TGST) energy losses at gland seals. The influences of an increase in the steam mass flow rate which leaked through front gland seal on TGST developed power, energy power losses and energy efficiencies were investigated. The marine TGST is a low-power steam turbine which drives an electricity generator. In an LNG carrier steam propulsion plant, two identical Turbo-Generator Steam Turbines are mounted, and they always operate parallelly because electricity supply should always be secured. A simplified scheme of the entire marine steam propulsion plant from the commercial LNG carrier is presented in Fig. 2 [17]. Components in marine steam power plant, which are not required in land-based steam power plants, are the evaporator (fresh water generator) and desuperheater (which prepare steam extracted from the main turbine for additional heating purposes) [27]. Energy efficiency can be defined with the following equation [33, 34]: ηen
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