CAIRO ELECTRICITY CAIRO ELECTRICITY PRODUCTIONPRODUCTION

COMPANY COMPANYCAIRO NORTH POWER STATIONCAIRO NORTH POWER STATION

Combustion Turbine Generators Combustion Turbine Generators forfor

Cairo North Power Station Cairo North Power Station 750MW Combined Cycle Project 750MW Combined Cycle Project

250MW Mitsubishi Heavy Industries , 250MW Mitsubishi Heavy Industries , LTD LTD

M701F Gas Turbine M701F Gas Turbine

Gas Turbine Longitudinal SectionGas Turbine Longitudinal Section The MITSUBISHI M701 F Gas Turbine consists of a The MITSUBISHI M701 F Gas Turbine consists of a 17-stage high efficiency axial compressor with 17-stage high efficiency axial compressor with variable Inlet guide vanes. variable Inlet guide vanes. A combustion chamber, equipped with 20 A combustion chamber, equipped with 20 combustors arranged in a circular pattern around combustors arranged in a circular pattern around the machine axis, and a four stage (reaction blading) the machine axis, and a four stage (reaction blading) turbine. The Gas Turbine features a high turbine. The Gas Turbine features a high temperature turbine, along with many features temperature turbine, along with many features derived during the evolution of the Mitsubishi Gas derived during the evolution of the Mitsubishi Gas Turbine fleet. The turbine blades incorporate Turbine fleet. The turbine blades incorporate variable and proven cooling system. The blades are variable and proven cooling system. The blades are coated to improve resistance against corrosion and coated to improve resistance against corrosion and mechanical wear. The turbine rotates clockwise mechanical wear. The turbine rotates clockwise when viewed from the inlet looking with flow. when viewed from the inlet looking with flow. Outside air is drawn through the inlet filter system, Outside air is drawn through the inlet filter system, the inlet manifold and the inlet casing and enters the inlet manifold and the inlet casing and enters the compressor. In the compressor section, the air is the compressor. In the compressor section, the air is compressed and forced into the combustion section. compressed and forced into the combustion section.

Fuel is burned in the combustors, where hot air is Fuel is burned in the combustors, where hot air is produced using a combustor system to minimize NOx produced using a combustor system to minimize NOx production. production. The hot gas is delivered into the turbine. As the hot The hot gas is delivered into the turbine. As the hot gas travels through the turbine it converts the high gas travels through the turbine it converts the high pressure and temperature gas into mechanical pressure and temperature gas into mechanical rotating energy. A portion of the rotating energy rotating energy. A portion of the rotating energy developed by the turbine is used to drive the developed by the turbine is used to drive the compressor; the remaining energy is used to drive compressor; the remaining energy is used to drive the generator and exciter. the generator and exciter. The gas is exhausted through the exhaust diffuser The gas is exhausted through the exhaust diffuser and axial exhaust manifold into the atmosphere and axial exhaust manifold into the atmosphere through an exhaust system stack-silencer or HRSG through an exhaust system stack-silencer or HRSG (Heat Recovery Steam Generator).(Heat Recovery Steam Generator).

701 F MITSUBISHI GAS TURBINE Longitudinal SectionLongitudinal Section

701 F MITSUBISHI

GAS TURBINE

INLET AIR DUCT

TURBINE SECTION

COMBUSTION SECTION

AXIAL COMP. SECTION

• The combustor inspection must follow the The combustor inspection must follow the specific intervals and maintenance specific intervals and maintenance guidelinesguidelines

Combustor INSPECTIONCombustor INSPECTION

• Before any work is started, Before any work is started, it’s important that all the required it’s important that all the required

Spare partsSpare parts Repaired partsRepaired parts Consumables Consumables And tools And tools are availableare available

701F Mitsubishi Gas turbine

STEP I STEP I Schedule of combustor

baskets

• Obtain Basic InformationObtain Basic Information

• Prepare Parts, Tools & ManpowerPrepare Parts, Tools & Manpower

• Record Operating ParametersRecord Operating Parameters

• Analyze Operation RecordsAnalyze Operation Records

• Secure Safety & Work ProcedureSecure Safety & Work Procedure

• Shutdown & Cool Unit Shutdown & Cool Unit

• Plan-out Corrective Measures, if Plan-out Corrective Measures, if required required

StepStep 22

• Remove flame detector & igniter Remove flame detector & igniter & press. Sensor & press. Sensor

• Remove roof of enclosureRemove roof of enclosure• Clean & inspect flame detector Clean & inspect flame detector • Clean & inspect igniter Clean & inspect igniter • Clean & inspect press. Sensor Clean & inspect press. Sensor • Remove thermal insulationRemove thermal insulation• Inspect compressor inletInspect compressor inlet• Inspect turbine outletInspect turbine outlet

• Remove manhole coverRemove manhole cover• Remove fuel piping Remove fuel piping • Remove fuel nozzlesRemove fuel nozzles• Flash & clean fuel piping Flash & clean fuel piping • Disassembly & clean fuel nozzles Disassembly & clean fuel nozzles • Remove cross flame tubeRemove cross flame tube• Reassembly & test fuel nozzlesReassembly & test fuel nozzles• inspect cross flame tubeinspect cross flame tube• Remove pressure detecting tube Remove pressure detecting tube • Remove combustor basketsRemove combustor baskets• Remove transition piece Remove transition piece • Inspect combustor basketInspect combustor basket

• Remove flexible supportRemove flexible support• Inspect transition piece & Inspect transition piece &

supportsupport• Inspect compressor IGVInspect compressor IGV• Inspect TURBINE VANES & Inspect TURBINE VANES &

BLADES ROW 1BLADES ROW 1

• Reassembly flexible supportReassembly flexible support• Reassembly transition pieceReassembly transition piece• Inspect combustor basket Inspect combustor basket • supportsupport• Inspect compressor IGVInspect compressor IGV• Inspect TURBINE VANES & Inspect TURBINE VANES &

BLADES ROW 1BLADES ROW 1

STEP 3STEP 3

Remove roof of Remove roof of enclosureenclosure

Remove flame detector, igniter , press. Remove flame detector, igniter , press. Sensor & thermocouples Sensor & thermocouples

• Inspect compressor inlet & inlet guid Inspect compressor inlet & inlet guid vanes cleaningvanes cleaning

• Remove manhole coverRemove manhole cover

REMOVE FUEL PIPINGREMOVE FUEL PIPING

• Remove fuel nozzlesRemove fuel nozzles

• Remove fuel Remove fuel nozzlesnozzles

• Remove fuel Remove fuel nozzlesnozzles

Fuel nozzles

Fuel nozzle

• test fuel nozzlestest fuel nozzles

• inspect cross flame tubeinspect cross flame tube

•inspect cross flame tubeinspect cross flame tube

Dypentrent test of cross fire tube

Test Cross fire tube

Remove combustor baskets

Remove combustor baskets

Test combustor baskets

Remove top hat

Transition Piece turbine cooling air pipe

Air 1st Stage Nozzle

1ST STAGE NOZZLE Transition piece

Remove u support & transition piece

Remove Transition Piece

Inspect 1st stage nozzle

Fuel nozzles test Fuel nozzles test

By pass elbow dyepentreat test

Top hat with the combustor baskets

New Combustor baskets

The axial compressor of the turbine

Transition alignment special tool

Transition alignment