Turbine Auxiliary Systems
Gas and steam turbines for the Power market require a number of auxiliary systems to function at optimum performance. Jord designs and supplies turbine accessory modules that span most turbine balance of plant requirements. These include standard turbine support systems such as fuel treatment, lube oil recirculation and water cooling, as well as bespoke one-off requirements such as iso-pentane vapourizers. Some indicative references are:
These modules delivered iso-pentane produced in a LNG facility to fuel an adjacent Combined Cycle Power Plant. Typically the iso-pentane in a LNG facility is either vented or flared. In this special project, the customer requirement was to capture the iso-pentane so that it could be consumed as a fuel gas in the CCPP.
Lube oil consoles (LOC’s) are typically designed in accordance with API 614 design specification. The function of the console is to provide lube oil to the turbine/compressor. Depending on the design basis (API 614 General or Special Purpose, non-API), components of the LOC can include reservoir with heater, main & emergency pumps, accumulators, temperature control and/or lube oil cooling.
The LOC referenced in the photo was one of four manufactured for a Petrobras FPSO offshore Brazil. Due to the ships configuration there were strict limitations on space. To meet the reservoir size and residence time requirements, separate equalizing tanks were required.
Below were two of four LOC’s delivered for a Thai onshore gas plant expansion project. Again, plotspace was severely restricted, requiring the duty for each turbine lube oil system to be accommodated in a plotspace of just 4.2m x 2.4m. Rigid client specifications further complicated the modules.
Upstream conditioning of the fuel gas prior to entering the turbine/compressor is necessary to remove any liquids/solids and to ensure the correct pressure and temperature of the gas. Unit operations can be built individually or as part of a single module to minimize site work and installation. The image is for fuel gas conditioning modules to IECEx supplied to a project in Australia.
Water injection skids are used to primarily provide a power boost to the turbine by increasing the power output per unit volume of air swallowed and/or lowering NOx emissions by reducing the TIT (turbine inlet temperature). A common option for the skid is an enclosed design which allows the unit to be situated outdoors in challenging climates.
Jord has supplied many hundreds of these units to all points of the globe. The units in the photo were supplied to a gas fired power station in Louisiana, USA.
Used as an alternative to cooling towers, these “dry cooled” cooling water modules use air rather than water as a cooling medium. They are used in locations where water is scarce, difficult to treat and/or is expensive. Recent regulations on water usage are resulting in air coolers becoming common around the globe. Jord offers air cooled heat exchangers with a high flow pump around system.
Water Wash Skids are used to clean gas turbine blades when fouling would otherwise cause a decrease in performance. Turbine wash cycles can be either On-Line or Off-Line. Their operation may be manual, semi-automatic, or fully automatic. Skids can be trolley type or permanently fixed. Modular skids with enclosures can be provided for extreme environments.
With steam turbine exhausts operating under vacuum, leaks into the first section through the turbine seals are inevitable. To minimize air being drawn into the turbine, steam is injected into the seals, but this steam/air mixture also has to exit, to prevent the injected steam from condensing in the glands. The Gland Steam Condenser provides a slight vacuum with either fans or ejectors and condenses the exhausted steam in a small heat exchanger. Air is vented to atmosphere.
