GTCYCLE

GTCYCLE

Steam Cycle Analysis and System Design of Combined Cycle Plants

The increasing demand for Power in the Indian sub-continent has forced Energy Planners to go for short gestation projects using fuels like Naphtha, Natural Gas and LNG (Liquefied Natural Gas) using Combined Cycle (CC) Technology.

GTCYCLE, the solution provider to the CC technology to evolve highest plant efficiency (more than 50%), comes handy to Energy Managers in planning and designing a suitable plant.

GTCYCLE handles system design of Combined Cycle Power Plants and designs entire Power Plant System including Gas Turbine, HRSG, Steam Turbine, HRSG Feed Pumps, Deaerator, Condenser, CEP, Cooling Tower, CW System, ACW System, Plant Water System, Fuel Unloading & Handling Plant, Air Conditioning and Ventilation System, Compressed Air System, Fire Fighting System, and Plant Power & Utility Piping System.

The expert data in-build in the software performs the sizing of the major equipment with the help of minimum Specific Project Input data and arrives at various parameters required for the Detailed Engineering of the Power Plant.

Gas Turbine System	Desalination Plant	Heat Balance Diagram
Steam Turbine System	DM Plant	Water Balance Diagram
HRSG System	Cooling Tower	HRSG Temperature Profile
CW System	Fuel Handling System	System Curves
ACW System	HVAC System	Equipment List
Raw Water System	Fire Fighting System	Electric Motor List
Compressor Inlet Cooling System	Compressed Air System	Project Cost Estimation
Surface Condenser	Power Piping System	Cost of Generation

It has built-in database (Performance curves) for most widely used 130 Gas Turbines from reputed manufacturers, for evaluating the site rating of the machine like Power Output, Heat Rate, Exhaust Flow & Temperature etc.

PG5371PA	PG9331FA	RLM5000-PE	GTX100	501F-MHI	701D	TG20B7/8	DR60G
PG6541B	PG9351FA	RLM6000PA	GT10	701F-MHI	701F	TG20B11/12	DR61
PG6551B	LM6000SPRINT	RLM6000PC	GT35	701G-MHI	501D5	TG50D5	DR61G
PG6561B	LM6000PC	G3142R (J)	GT5	MFT8	501D5A	TG50D5S	DR61GP
PG6101FA	LM600PA	G3152	FT8	V64.3	501F	H-15(I)	DR61P
PG7121EA	LM5000PC	GT8C	FT8TWIN	V64.3A	501G	H-25	DR63G-40
PG7161EC	LM2500PE	GT11N	D-18E(25)	V84.2	401	H25(I)	DR62G
PG7221FA	LM2500+PK	GT13D	MF-111A	V84.2A	251B11/12	GT151	DR63G
PG7231FA	LM2500+PV	GT11N2	MF-111B	V84.3A	AVON	GT15000	SB60-2
PG7241FA	LM1600PA	GT13E	MF-221	V94.2	RB211	GT16000	SB60-1
PG9171E	RLM1600	GT24	MW-251	V94.2A	TRENT	GT16002	SB120
PG9231EC	RLM2500-PE	GT26	MW-501	V94.3	Mars100-89	GT25000	Coberra2000
PG9311FA	RLM2500+	GT8C2	MW-701	V94.3A	Mars100-94	GTG110	Coberra6000

The important feature of this software is that it performs OFF-DESIGN performance of the power plant and the behaviour of the plant for different operating conditions can be stimulated by varying parameters.

The Gas Turbine Features include;

	Evaporative Coolers
	Steam/Electric Chillers
	Selection of Burners for Nox
	Nox Control by Steam and Water Injection
	Fuel Flexibiity (Liquid, Gas or Duel Fuel)
	Part Load and Off-design Performance
	Aging Correction
	Effect of compressor fouling between off-line compressor wash
	Automatic Corrections for ambient and operating & site parameters

The Gas Turbine Corrections include;

	Exhaust Gas Temperature Correction for Air Inlet Temperature
	Output Correction for Air Inlet Temperature
	Exhaust Flow Correction for Air Inlet Temperature
	Heat Rate Correction for Air Inlet Temperature
	Output and Exhaust Flow Correction for Altitude
	Output and Heat Rate correction for Humidity
	Correction for non-recoverable loss due to aging
	Correction for performance loss following normal maintenance and Compressor Wash

The Steam Turbine Features include;

	Non-Reheat Condensing
	Reheat Condensing
	Extraction for Steam for Nox Control
	Low Pressure Steam Admission
	Automatic Calculation of back pressure based on ambient and Cooling Water Temperature
	The expansion efficiency, Turbine Mechanical, gear box and generator efficiencies can be varied to suit a particular turbine.

The HRSG Features include;

	Reheat / Non-Reheat Type
	Maximum upto 4 Pressure Levels
	Sliding or Constant Pressure Mode
	SH / RH Temperature Control Range
	Independent or Integral Deaerator
	Fired or Unfired
	Condensate Pre-heater
	Part load Pinch and Approach
	HRSG Temperature profile at different Load

The Heat Balance Diagram depicts the Combined Cycle Power Plant configuration and also gives performance details like Heat-Rate, Gross Power, Auxiliary Power Consumption, Net Power, and Plant Efficiency.

The HRSG Performance gives complete calculations for Heat Duty, Steam Generation, Configuration of the Heating Surfaces (Modules), Steam and Gas Temperature Profile, Heat Duty Distribution and Main Stack. The HRSG Temperature Profile Drawing depicts the Steam/Water Temperature and Gas Temperature profile over heating surfaces (Modules).

The System Curves generated includes;

Load Vs

GT Exhaust & HRSG Exit Gas Temperature

GT Exhaust Flow

HP/RH/IP/LP Steam Flow

HP Steam Pressure

RH/IP/LP Steam Pressure

HP/RH/IP/LP Steam Temperature

GT Exhaust Gas Analsysis

GTG/STG/Gross/Net Output

Gross/Net Heat Rate

Plant Gross/Net Efficiency

The software is validated under design mode and off-design mode against the heat balance data of internationally reputed gas turbine and steam turbine manufacturers. The variations reported which is insignificant, is primarily because of the difference in water and steam properties routine being used and also due to the fact that the detailed simulation of all equipment has not been used in the software.

This software has been developed to allow combined cycle power plant designers to develop base designs, scenarios, without having to request data from both gas turbine and HRSG manufacturers.

The results obtained from this software are within limits of error of plus or minus 1% on Power Output and 3% on Steam flow and will allow an engineer to effectively evaluate competitive systems, or changes to the design of existing system.

The other features are neat outputs comprising;

	Heat Balance Diagram (DESIGN/OFF-DESIGN)
	Water Balance
	System Curves
	System Design
	HRSG Performance
	HRSG Temperature Profile
	Equipment List and Electric Motor List
	Cost Estimation and Cost of Generation