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GE introduced the first high-efficiency H-class gas turbines to thepower generation industry in 2002.The steam-cooled units have logged200 000 hours of operation andcounting and have proven them-selves to be stalwarts within GEsgas turbine lineup. Now, thanks toadvances in technology and sharedknowledge from its myriad businessunits, GE is introducing the 7HA and9HA air-cooled gas turbines.

In a simple-cycle configuration,the 9HA.01 is rated 397 MW andthe 9HA.02 is rated 470 MW, eachat 3000 r/min, offering greater than41% efficiency. In a 1x1 combined-cycle configuration, the 9HA.01 israted 592 MW and the 9HA.02 israted 701 MW, each at 3000 r/min,offering greater than 61% efficiency.

In a simple-cycle configuration,the 7HA.01 is rated 275 MW andthe 7HA.02 is rated 330 MW, each

We are offering our air-cooledH-class gas turbines in two versionsfor the 50 Hz market the 9HA.01and 9HA.02 and two versions forthe 60 Hz market the 7HA.01 and7HA.02, said Vic Abate, President andCEO, Power Generation Products, forGE Power & Water. The air-cooledH-class gas turbines are designedfor cyclic and base-load operationin a simple-cycle and combined-cycle applications.

New Air-CooledH-ClassGE adds air-cooled H-class to its gas turbine lineup

BYBRENTHAIGHT

The first 9HA gas tur-

bine was manufactured

in Belfort, France, and will

be delivered to GEs Green-

ville, South Carolina, U.S.A.,

test facility during the second

quarter of 2014, where it will under-

go full-scale, full-load testing.

DEDICATED TO ENGINE ROOM PRODUCTS, TECHNOLOGIES & NEWS FirstLook

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at 3600 r/min, offering greater than41% efficiency. In a 1x1 combined-cycle configuration, the 7HA.01 israted 405 MW and the 7HA.02 israted 486 MW, each at 3600 r/min,offering greater than 61% efficiency.

The high-efficiency segment ac-counts for more than 30% of thepower generation market, Abatesaid. That is where the air-cooledH-class comes in. The 7HA.01 is 275MW. The 7HA.02 is 330 MW. Thosetwo machines, in the 60 Hz market,give you a 400 MW combined-cyclepower plant, a 500 MW combined-cycle power plant and then you canbulk into 800 and 1000 MW, or 1200and 1500. Those sizes fit extremelywell with the retirement of coal thatwe see and some of the natural mar-kets for fixed gears.

Then in the 50 Hz they are a scaleversion, the 9HA.01 and 9HA.02,at 397 MW and 470 MW. So thosethen reach 600 MW and 700 MW incombined-cycle, and can bulk into1200 and 1400 MW, or 1800 and2100 MW.

We define H-class as over 2600Ffiring temperature. The entire in-dustry has probably 250 000 hours.GE has been in the H-class for more

than a decade. We have a tremendousamount of experience and are confi-dent in where we are going with thisnext step.

According to Abate, air-cooledH-class gas turbines offer the reli-ability, flexibility and availability ofGEs popular F-class fleet and lever-age technology from GEs aviationbusiness as well as its extensive ex-perience within the power generationmarketplace.

The air-cooled H-class gas tur-bine incorporates an aerodynamic14-stage compressor, leveraged fromGEs proven aircraft engine tech-nology, and includes an advancedradial diffuser. Combined with theDry Low NOx (DLN) 2.6+AFS (Ax-ial Fuel Staged) combustion system,this allows improved operation ofthe combustion liner and transitionpiece cooling, according to GE. TheDLN 2.6+AFS combustion systemprovides advanced fuel staging forenhanced steady state and transientperformance. To modulate airflow, avariable inlet guide vane (IGV) andthree stages of variable stator vanes(VSVs) manage compressor operabil-ity during start-up, control compres-sor airflow during turndown, and

facilitate variations in ambient tem-perature and load.

Weve taken the engine compres-sor design from our aircraft enginedivision and implemented it intoour air-cooled H-class gas turbine,Abate said. What that does, thecompressor has to compress twicethe amount of air that you need be-cause half of it goes to produce pow-er and half of it goes to driving thecompressor. If you can get the com-pressor to be more efficient, that is ahuge opportunity.

With regard to combustion, asyou fire hotter you trade emissions.Holding emissions at world class lev-els is paramount for GE as we havealways been an emissions leader.Weve continued to develop our DLNemissions technology, which en-ables us to hold emissions with ourair-cooled H-class gas turbines. Theenhanced DLN 2.6+AFS combus-tion system supports improved fueldistribution and operability while re-ducing thermal loading on the cap,liner, and transition piece. Whenyou think about the power turbinesection, we release about 1 millionhorsepower in 3 feet. These enginesare operating 400F-plus above the

GEs new 9HA gas turbine rotor on the half shell casing. The

air-cooled H-class gas turbines are designed for cyclic and base-

load operation in simple-cycle and combined-cycle applications.

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melting point of met-al. Its a very high-tech,challenging environment. Ad-vanced materials coatings, includingthermal barrier coatings on the air-foil and single-crystal super alloys onthe airfoil wall, promote durabilityand extend parts life by 1.5% versuscomparable technology.

The first 9HA gas turbine wasmanufactured in Belfort, France, andwill be delivered to GEs Greenville,South Carolina, U.S.A., test facilityduring the second quarter of 2014,where it will undergo full-scale, full-load testing.

The Greenville test facility rep-licates real-world plant conditionswith the required accessories to runa fully loaded gas turbine on natu-ral gas and liquid fuel. To eliminatelimitations of the grid, testing is per-formed without a generator and gridconnection. The facility is capable oftesting 50 and 60 Hz products. (SeeBeyond Real-World Testing, Diesel& Gas Turbine Worldwide,September2012, p. 54.)

What is interesting about thistest facility, is that by being inde-pendent of the grid, we have theability to modify speed, we can getoff-design conditions and monitorthe responses of air foils, structuralcomponents, etc., Abate said. Wecan see all of ranges of the unitsperformance. With that we can un-

leash more value through applica-tion engineering and also mitigaterisk with application.

Natural gas is becoming the fuelof choice globally and for customerswho operate larger blocks of power.The desire for increased operating ef-ficiency and flexibility has never beengreater. Technological advancementsand increasingly stringent environ-

mental regulations arehelping to answer the

call for a new generation of ma-chines by pushing the power genera-tion industry to achieve new perfor-mance standards.

The whole strategy surroundingGE is technology leadership. Thebeauty of a high-tech natural gasplant is that you dont sell them onstyle, you sell them because they havethe best economics, they have the besttechnical capability and they provideour customers the best return. A

A 9HA gas turbine traveling through Belfort, France, from the GE manufacturing facility to the P

of Strasbourg. More than 3000 people turned out to see the 9HA make its way through Belfort

A fully assembled 9HA gas turbine being

transferred for packaging and shipping.

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Air-Cooled H-Class Specifications

Combined-Cycle Performance

7HA.01 7HA.02

1x1 2x1 1x1 2x1

Plant Output (net) 405 MW 813 MW 486 MW 976 MW

Heat Rate (net) 5580 Btu/kWh

5892 kJ/kWh

5570 Btu/kWh

5877 kJ/kWh

5580 Btu/kWh

5892 kJ/kWh

5570 Btu/kWh

5877 kJ/kWhPlant Efficiency Greater than 61% Greater than 61% Greater than 61% Greater than 61%

The 7HA Gas Turbines Attributes

EfficiencyGreater than 41% simple-cycle efficiency, greater than 61%combine-cycle efficiency.

Start Capability Fast start as low as 10 minutes from the start command.

Turndown As low as 30% of base-load.

Ramp Rate The 7HA has one of the best ramp rates in its class at greater than 40 MW/min.

Emissions Less than 25 ppm NOxand CO.

The 9HA Gas Turbines Attributes

EfficiencyGreater than 41% simple-cycle efficiency, greater than 61%combine-cycle efficiency.

Start CapabilityLess than 30 minutes to full plant base-load a 25% improvement

over comparable technologies.

Turndown As low as 30% of base-load.

Ramp Rate The 9HA has one of the best ramp rates in its class at nearly 60 MW/min.

Emissions Less than 25 ppm NOxand CO.

Simple-Cycle Performance

Output (net)275 MW 7HA.01330 MW 7HA.02

Heat Rate (net)8240 Btu/kWh

8694 kj/kWh

Efficiency (net) Greater than 41%

Pressure Ratio 21.5

Exhaust Flow1269 lb./sec 7HA.01

1522 lb./sec 7HA.02

Turbine Speed 3600 r/minExhaust Temperature 1138F

Simple-Cycle Performance

Output (net)397 MW 9HA.01470 MW 9HA.02

Heat Rate (net)8220 Btu/kWh

8673 kj/kWh

Efficiency (net) Greater than 41%

Pressure Ratio 21.8

Exhaust Flow1822 lb./sec 9HA.01

2157 lb./sec 9HA.02

Turbine Speed 3000 r/minExhaust Temperature 1146F

Combined-Cycle Performance

9HA.01 9HA.02

1x1 2x1 1x1 2x1

Plant Output (net) 592 MW 1181 MW 701 MW 1398 MW

Heat Rate (net) 5560 Btu/kWh5866 kj/kWh

5570 Btu/kWh

5878 kj/kWh

5560 Btu/kWh

5866 kj/kWh

5570 Btu/kWh

5878 kj/kWh

Plant Efficiency Greater than 61% Greater than 61% Greater than 61% Greater than 61%

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