The Impact of Fuel Flexible Gas Turbine Control Systems on Integrated Gasification Combined Cycle Performance

2003 ◽  
Author(s):  
Norman Z. Shilling ◽  
Robert M. Jones
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Gas Turbine ◽  
Combined Cycle ◽  
Design Parameters ◽  
Combustion System ◽  
Integrated Gasification Combined Cycle ◽  
Combustion Systems ◽  
Integrated Gasification ◽  
The Impact

Interest in Integrated Gasification Combined Cycle (IGCC) is developing from a need for fuel diversification as a hedge for natural gas price and availability. In IGCC, the gas turbine combustion system is critical to meeting this need. The combustion system also needs to achieve superior environmental performance. This paper discusses specific requirements for IGCC combustion systems that derive from characteristics of gasification fuels and integration with the gasification process. Tradeoffs between system physical design parameters and control strategies must be evaluated in terms of overall functionality of the IGGC process. The key metrics for evaluating “goodness” of design are reliability, availability, maintainability (RAM), robustness to process variability, response to upsets and trips, time to synchronization and startup and shutdown automation. For IGCC, high availability is achieved from the capability of the turbine to robustly co-fire low-calorific synthesis gas with supplementary fuels. Co-firing compensates for shortfalls in gasifier output and maintains continuity of power service during servicing of the gasification plant. Controls need to provide seamless transfers between varying levels of syngas and supplementary fuel, and over the widest range of fuel mixes and power levels. Low calorific fuels provide special challenges to control system design. Variability in syngas composition, temperature and pressure will impact the minimum and maximum nozzle pressure drops and controllability. The effect of fuel constituents on controllability is captured in the modified Wobbe index. Stability and margin against flameout is captured in the upper-to-lower flammability ratio. The paper discusses the restrictions on these parameters for IGCC combustion systems. Control hardware and manifolding necessary with low calorific fuel can potentially conflict with accessibility to the gas turbine. Safe transfers from natural gas to syngas and shutdowns require purge strategies that account for residual energy in ductwork. Finally, the design of the Exxon Singapore IGCC control system is described which provides an extended range of cofiring and load control.

Technology Considerations for Optimizing IGCC Plant Performance

1993 ◽  
Author(s):  
James C. Corman ◽  
Douglas M. Todd
Keyword(s):  
Gas Turbine ◽  
System Integration ◽  
Combined Cycle ◽  
Plant Performance ◽  
Integrated Gasification Combined Cycle ◽  
Gas Combustion ◽  
Commercial Viability ◽  
Technical Innovations ◽  
Integrated Gasification ◽  
The Impact

The integrated gasification combined cycle (IGCC) concept is gaining acceptance as the Clean Coal technology with the best potential for continued improvement in performance and continued reduction in capital cost. In large part this potential will be realized by optimizing the integration of power generation and fuel conversion subsystems and by exploiting advances in gas turbine technology. This paper discusses the impact that technology advances in the gas turbine combined cycle are having on the commercial viability of the IGCC concept. Technical innovations in such areas as coal gas combustion, plant control, and system integration will ensure that IGCC technology will continue to advance well into the future.

A Comparative Analysis of Single Nozzle and Multiple Nozzles Arrangements for Syngas Combustion in Heavy Duty Gas Turbine

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Shi Liu ◽  
Hong Yin ◽  
Yan Xiong ◽  
Xiaoqing Xiao
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Heavy Duty ◽  
Gas Turbine Combustor ◽  
Integrated Gasification Combined Cycle ◽  
Wide Range ◽  
Heavy Duty Gas Turbine ◽  
Integrated Gasification

Heavy duty gas turbines are the core components in the integrated gasification combined cycle (IGCC) system. Different from the conventional fuel for gas turbine such as natural gas and light diesel, the combustible component acquired from the IGCC system is hydrogen-rich syngas fuel. It is important to modify the original gas turbine combustor or redesign a new combustor for syngas application since the fuel properties are featured with the wide range hydrogen and carbon monoxide mixture. First, one heavy duty gas turbine combustor which adopts natural gas and light diesel was selected as the original type. The redesign work mainly focused on the combustor head and nozzle arrangements. This paper investigated two feasible combustor arrangements for the syngas utilization including single nozzle and multiple nozzles. Numerical simulations are conducted to compare the flow field, temperature field, composition distributions, and overall performance of the two schemes. The obtained results show that the flow structure of the multiple nozzles scheme is better and the temperature distribution inside the combustor is more uniform, and the total pressure recovery is higher than the single nozzle scheme. Through the full scale test rig verification, the combustor redesign with multiple nozzles scheme is acceptable under middle and high pressure combustion test conditions. Besides, the numerical computations generally match with the experimental results.

Performance Analysis of Evaporative Biomass Air Turbine Cycle With Gasification for Topping Combustion

2001 ◽  
Author(s):  
Jens Wolf ◽  
Federico Barone ◽  
Jinyue Yan
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Solid Fuel ◽  
Combined Cycle ◽  
Present System ◽  
Fluidized Bed Combustion ◽  
Integrated Gasification Combined Cycle ◽  
Air Turbine ◽  
Integrated Gasification ◽  
The Impact

This paper investigates the performance of a new power cycle, a so called Evaporative Biomass Air Turbine (EvGT-BAT) cycle with gasification for topping combustion. The process integrates an externally fired gas turbine (EFGT), an evaporative gas turbine (EvGT) and biomass gasification. Through such integration, the system may provide the potential for adapting features from different advanced solid-fuel based power generation technologies, e.g. externally fired gas turbine, integrated gasification combined cycle (IGCC) and fluidized bed combustion, thus improving the system performance and reducing the technical difficulties. In the paper, the features of the EvGT-BAT cycle have been addressed. The thermal efficiencies for different integrations of the gasification for topping combustion and the heat recovery have been analyzed. By drying the biomass feedstock, the thermal efficiency of the EvGT-BAT cycle can be increased by more than 3 percentage points. The impact of the outlet air temperature of the high temperature heat exchanger has also been studied in the present system. Finally, the size of the gasifier for topping combustion has been compared with the one in IGCC, which illustrates that the gasifier of the studied system can be much smaller compared to IGCC. The results of the study will be useful for the future engineering development of advanced solid fuel power generation technologies.

Performance Analysis of Evaporative Biomass Air Turbine Cycle With Gasification for Topping Combustion

2002 ◽  
Vol 124 (4) ◽  
pp. 757-761 ◽  
Author(s):  
J. Wolf ◽  
F. Barone ◽  
J. Yan
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Solid Fuel ◽  
Combined Cycle ◽  
Present System ◽  
Fluidized Bed Combustion ◽  
Integrated Gasification Combined Cycle ◽  
Air Turbine ◽  
Integrated Gasification ◽  
The Impact

This paper investigates the performance of a new power cycle, a so called evaporative biomass air turbine (EvGT-BAT) cycle with gasification for topping combustion. The process integrates an externally fired gas turbine (EFGT), an evaporative gas turbine (EvGT), and biomass gasification. Through such integration, the system may provide the potential for adapting features from different advanced solid-fuel-based power generation technologies, e.g., externally fired gas turbine, integrated gasification combined cycle (IGCC), and fluidized bed combustion, thus improving the system performance and reducing the technical difficulties. In the paper, the features of the EvGT-BAT cycle have been addressed. The thermal efficiencies for different integrations of the gasification for topping combustion and the heat recovery have been analyzed. By drying the biomass feedstock, the thermal efficiency of the EvGT-BAT cycle can be increased by more than three percentage points. The impact of the outlet air temperature of the high-temperature heat exchanger has also been studied in the present system. Finally, the size of the gasifier for topping combustion has been compared with the one in IGCC, which illustrates that the gasifier of the studied system can be much smaller compared to IGCC. The results of the study will be useful for the future engineering development of advanced solid fuel power generation technologies.

Analysis of the impact of gas turbine modifications in integrated gasification combined cycle power plants

Energy ◽  
2013 ◽  
Vol 55 ◽  
pp. 977-986 ◽  
Author(s):  
Young Sik Kim ◽  
Sung Ku Park ◽  
Jong Jun Lee ◽  
Do Won Kang ◽  
Tong Seop Kim
Keyword(s):  
Gas Turbine ◽  
Power Plants ◽  
Combined Cycle ◽  
Integrated Gasification Combined Cycle ◽  
Integrated Gasification ◽  
The Impact

Gas Turbine Combined Cycle With CO2-Capture Using Auto-Thermal Reforming of Natural Gas

2000 ◽  
Author(s):  
Thormod Andersen ◽  
Hanne M. Kvamsdal ◽  
Olav Bolland
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Process Integration ◽  
Combined Cycle ◽  
Co2 Removal ◽  
Gas Turbine Combustor ◽  
Chemical Absorption ◽  
Fuel Gas ◽  
The Impact ◽  
Water Gas

A concept for capturing and sequestering CO2 from a natural gas fired combined cycle power plant is presented. The present approach is to decarbonise the fuel prior to combustion by reforming natural gas, producing a hydrogen-rich fuel. The reforming process consists of an air-blown pressurised auto-thermal reformer that produces a gas containing H2, CO and a small fraction of CH4 as combustible components. The gas is then led through a water gas shift reactor, where the equilibrium of CO and H2O is shifted towards CO2 and H2. The CO2 is then captured from the resulting gas by chemical absorption. The gas turbine of this system is then fed with a fuel gas containing approximately 50% H2. In order to achieve acceptable level of fuel-to-electricity conversion efficiency, this kind of process is attractive because of the possibility of process integration between the combined cycle and the reforming process. A comparison is made between a “standard” combined cycle and the current process with CO2-removal. This study also comprise an investigation of using a lower pressure level in the reforming section than in the gas turbine combustor and the impact of reduced steam/carbon ratio in the main reformer. The impact on gas turbine operation because of massive air bleed and the use of a hydrogen rich fuel is discussed.

scholarly journals Simulation and optimization integrated gasification combined cycle by used aspen hysys and aspen plus

2015 ◽  
Vol 3 (1) ◽  
pp. 178
Author(s):  
Mohsen Darabi ◽  
Mohammad Mohammadiun ◽  
Hamid Mohammadiun ◽  
Saeed Mortazavi ◽  
Mostafa Montazeri
Keyword(s):  
Gas Turbine ◽  
Coal Gasification ◽  
Aspen Plus ◽  
Combined Cycle ◽  
Parameters Estimation ◽  
Integrated Gasification Combined Cycle ◽  
Support Tool ◽  
Simulation And Optimization ◽  
Aspen Hysys ◽  
Integrated Gasification

<p>Electricity is an indispensable amenity in present society. Among all those energy resources, coal is readily available all over the world and has risen only moderately in price compared with other fuel sources. As a result, coal-fired power plant remains to be a fundamental element of the world's energy supply. IGCC, abbreviation of Integrated Gasification Combined Cycle, is one of the primary designs for the power-generation market from coal-gasification. This work presents a in the proposed process, diluted hydrogen is combusted in a gas turbine. Heat integration is central to the design. Thus far, the SGR process and the HGD unit are not commercially available. To establish a benchmark. Some thermodynamic inefficiencies were found to shift from the gas turbine to the steam cycle and redox system, while the net efficiency remained almost the same. A process simulation was undertaken, using Aspen Plus and the engineering equation solver (EES).The The model has been developed using Aspen Hysys® and Aspen Plus®. Parts of it have been developed in Matlab, which is mainly used for artificial neural network (ANN) training and parameters estimation. Predicted results of clean gas composition and generated power present a good agreement with industrial data. This study is aimed at obtaining a support tool for optimal solutions assessment of different gasification plant configurations, under different input data sets.</p>

Design and Test of a 73-MW Water Cooled Gas Turbine

1980 ◽  
Author(s):  
A. Caruvana ◽  
R. S. Rose ◽  
E. D. Alderson ◽  
G. A. Cincotta
Keyword(s):  
Gas Turbine ◽  
Combined Cycle ◽  
Water Cooling ◽  
Integrated Gasification Combined Cycle ◽  
Hot Gas ◽  
Critical Technology ◽  
Component Development ◽  
Recent Developments ◽  
Integrated Gasification ◽  
Future Plans

This paper presents a preliminary design of a water-cooled gas turbine capable of operating on coal derived fuels and producing 73 MW when burning low Btu coal gas. Particular emphasis is placed on the critical technology issues of combustion and heat transfer at 2600 deg firing temperature. The recent technology developments; i.e., materials developments, composite construction, water cooling, fuels cleanup, etc., which now make this advanced concept possible are discussed. Detailed descriptions of the hot gas path components, the staged sectoral combustor, the water cooled nozzles and buckets, are described showing the implementation of these recent developments. The component development test program which is underway, is described and where testing results are available, design confirmation is demonstrated. Future plans for the construction of a full scale prototype machine and for design verification testing are presented. An analytical evaluation is included which demonstrates the advantages of the water-cooled gas turbine in an integrated gasification combined cycle.

scholarly journals The Effect of CO2 Partial Pressure on CH4 Recovery in CH4-CO2 Swap with Simulated IGCC Syngas

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1017
Author(s):  
Ya-Long Ding ◽  
Hua-Qin Wang ◽  
Chun-Gang Xu ◽  
Xiao-Sen Li
Keyword(s):  
Natural Gas ◽  
Partial Pressure ◽  
Combined Cycle ◽  
Equilibrium Curve ◽  
X Ray Diffraction ◽  
Integrated Gasification Combined Cycle ◽  
Co2 Partial Pressure ◽  
Hydrate Phase ◽  
Integrated Gasification

To investigate the influence of CO2 partial pressure on efficiency of CH4-CO2 swap from natural gas hydrates (NGHs), the replacement of CH4 from natural gas hydrate (NGH) is carried out with simulated Integrated Gasification Combined Cycle (IGCC) syngas under different pressures, and the gas chromatography (GC), in-situ Raman, and powder X-ray diffraction (PXRD) are employed to analyze the hydrate compositions and hydrate structures. The results show that with the P-T (pressure and temperature) condition shifting from that above the hydrate equilibrium curve of IGCC syngas to that below the hydrate equilibrium curve of IGCC syngas, the rate of CH4 recovery drastically rises from 32% to 71%. The presence of water can be clearly observed when P-T condition is above the hydrate equilibrium curve of IGCC syngas; however the presence of water only occurs at the interface between gas phase and hydrate phase. No H2 is found to present in the final hydrate phase at the end of process of CH4-CO2 swap with IGCC syngas.

scholarly journals Gas Turbine Firing Medium BTU Gas From Gasification Plant

1996 ◽  
Author(s):  
Piero Zanello ◽  
Andrea Tasselli
Keyword(s):  
Gas Turbine ◽  
Large Scale ◽  
Combined Cycle ◽  
Plant Design ◽  
Integrated Gasification Combined Cycle ◽  
Extensive Test ◽  
Gas Fuel ◽  
Gasification Plant ◽  
Integrated Gasification ◽  
Maximum Reliability

IGCC (Integrated Gasification Combined Cycle) plants for large scale power generation are becoming more and more attractive. For a gas turbine generating set to operate on Medium BTU gas, it takes dedicated design of both engine and auxiliaries. A new combustion section, with extensive test support, has been developed. Alternative options to reduce inlet air flow and NOx emissions have been compared and appropriate solutions adopted. All auxiliaries systems have been modified according to the gas fuel characteristics. Integration between plant systems has been carefully evaluated and a control system implemented in order to reach maximum reliability. The paper deals with different technical aspects of the engine as well as the plant design.

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