Gas Turbine Power Plant (Simple and Combined Cycle)

PLANT DESCRIPTION

Gas turbine plants for power generation purposes are conventionally used in two different configurations:

• Simple cycle
• Combined cycle

In simple cycle configuration the gas turbine exhaust gases are used to drive a turbine which in turn drives an electrical generator. The gas leaving the turbine is exhausted through a chimney to atmosphere.

In combined cycle operation, the gas leaving the turbine is exhausted through a Heat Recovery Steam Generator (HRSG). This steam is used to drive a steam turbine generator. Therefore electrical power generation is achieved through the gas turbine generator and the steam turbine generator. Combined cycle configuration typically increases power output by 50% for the same fuel consumption.

KENTZ CAPABILITIES AND EXPERIENCE

Where the client has chosen to award the contract on a EPC (Engineer, Procure & Construct) basis, Kentz typically enters into consortium with an established OEM for the power plant prime equipment such as gas turbines, HRSGs and steam turbines. Kentz takes responsibility for the complete Balance of Plant (BOP) for all mechanical, piping, electrical & instrumentation and civil works. Complete site installation works is performed by Kentz, supported as required by specialist OEM technical representatives.

Balance of Plant scope typically comprises the following:

• Natural gas treatment and distribution systems
• Fuel oil treatment and distribution systems
• Demineralised water systems
• Compressed air systems
• Chemical dosing systems
• Steam and water sampling systems
• Laboratory and workshop equipment
• Feedwater pumping systems
• Wastewater treatment systems
• Gas turbine outlet exhaust systems, diverter dampers and exhaust stacks
• Low, medium and high voltage electrical distribution systems
• Distributed Control Systems (DCS)

ENGINEERING, PROCUREMENT & CONSTRUCTION

Kentz performs the complete Balance of Plant engineering and procurement functions. Engineering of the plant is carried out in close consultation with the OEM, who provides key design input such as major equipment loads and dimensions. Kentz performs engineering for all disciplines, such as civils, mechanical, process, electrical and Iistrumentation systems.

Procurement and expediting roles involve extensive logistical challenges due to worldwide sourcing of equipment and often challenging and remote locations of project sites. Kentz employs the services of many Third Party Inspection Companies to ensure all equipment supplied meets all applicable Regulatory Standards and Project Specification requirements.

Construction and commissioning is largely executed on a self-perform basis by Kentz, with specialist subcontractors employed as required. Construction and commissioning involves preparation of all required handover documentation presented to the client.

Following handover of the plant, Kentz provides site-based warranty engineers for the duration of the warranty period.

Kentz has worked in consortium with many of the worlds leading OEMs, including:

• GE
• Siemens
• Alstom