Waste Heat Recovery From Gas Turbines

2020 ◽  
Author(s):  
Waneya Al Ketbi ◽  
Saqib Sajjad ◽  
Eisa Al Jenaibi
Keyword(s):  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat

scholarly journals Waste Heat Recovery for Offshore Applications

2012 ◽  
Author(s):  
Leonardo Pierobon ◽  
Rambabu Kandepu ◽  
Fredrik Haglind
Keyword(s):  
Gas Turbine ◽  
Thermal Energy ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Oil And Gas ◽  
Waste Heat ◽  
Offshore Platforms ◽  
Organic Rankine Cycles ◽  
Heat Loads

With increasing incentives for reducing the CO2 emissions offshore, optimization of energy usage on offshore platforms has become a focus area. Most of offshore oil and gas platforms use gas turbines to support the electrical demand on the platform. It is common to operate a gas turbine mostly under part-load conditions most of the time in order to accommodate any short term peak loads. Gas turbines with flexibility with respect to fuel type, resulting in low turbine inlet and exhaust gas temperatures, are often employed. The typical gas turbine efficiency for an offshore application might vary in the range 20–30%. There are several technologies available for onshore gas turbines (and low/medium heat sources) to convert the waste heat into electricity. For offshore applications it is not economical and practical to have a steam bottoming cycle to increase the efficiency of electricity production, due to low gas turbine outlet temperature, space and weight restrictions and the need for make-up water. A more promising option for use offshore is organic Rankine cycles (ORC). Moreover, several oil and gas platforms are equipped with waste heat recovery units to recover a part of the thermal energy in the gas turbine off-gas using heat exchangers, and the recovered thermal energy acts as heat source for some of the heat loads on the platform. The amount of the recovered thermal energy depends on the heat loads and thus the full potential of waste heat recovery units may not be utilized. In present paper, a review of the technologies available for waste heat recovery offshore is made. Further, the challenges of implementing these technologies on offshore platforms are discussed from a practical point of view. Performance estimations are made for a number of combined cycles consisting of a gas turbine typically used offshore and organic Rankine cycles employing different working fluids; an optimal media is then suggested based on efficiency, weight and space considerations. The paper concludes with suggestions for further research within the field of waste heat recovery for offshore applications.

RACER Conceptual Design

1983 ◽  
Vol 105 (3) ◽  
pp. 621-626 ◽  
Author(s):  
J. T. Halkola ◽  
A. H. Campbell ◽  
D. Jung
Keyword(s):  
Gas Turbines ◽  
Energy Recovery ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Fuel Saving ◽  
Fuel Savings ◽  
Waste Heat Recovery System ◽  
Recovery System

The Rankine Cycle Energy Recovery (or RACER) is an unfired waste heat recovery system designed for use aboard U.S. Navy gas turbine powered ships. The system converts waste heat from the exhaust of the main propulsion gas turbines into useful shaft horsepower and is currently planned for installation aboard the new DDG-51 class of ships. The design philosophy used in determining an overall system concept to minimize manning yet maximize availability, reliability and fuel savings is discussed. The paper also describes the trade-off analyses made to size the system in relation to overall fuel saving and gives a brief summary of the test programs to verify the system prior to ship installation.

scholarly journals The Design and Economics of On-Site Generation With Aircraft-Type Gas Turbines for a Chemical Complex

1967 ◽  
Author(s):  
A. B. Crouchley ◽  
C. E. Carroll’
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Steam Generation ◽  
Chemical Complex ◽  
Optimum Approach ◽  
Aircraft Type ◽  
Technical Considerations

This paper discusses the economic and technical considerations involved in the decision of a large chemical complex to install on-site power generation; why the gas turbine with waste-heat recovery for process steam generation was determined to be the optimum approach; and the reasons for selecting the aircraft-type gas turbine for this particular application. A brief description of plant components and operation is also included.

Waste Heat Recovery in LNG Liquefaction Plants

2015 ◽  
Author(s):  
P. Pillai ◽  
C. Meher-Homji ◽  
F. Meher-Homji
Keyword(s):  
Thermal Efficiency ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Combined Cycle ◽  
Capital Outlay ◽  
Fuel Gas ◽  
Lng Liquefaction ◽  
The Impact

High thermal efficiency of LNG liquefaction plants is of importance in order to minimize feed usage and to reduce CO2 emissions. The need for high efficiency becomes important in gas constrained situations where savings in fuel auto consumption of the plant for liquefaction chilling and power generation can be converted into LNG production and also from the standpoint of CO2 reduction. This paper will provide a comprehensive overview of waste heat recovery approaches in LNG Liquefaction facilities as a measure to boost thermal efficiency and reduce fuel auto-consumption. The paper will cover types of heating media, the need and use of heat for process applications, the use of hot oil, steam and water for process applications and direct recovery of waste heat. Cogeneration and combined cycle approaches for LNG liquefaction will also be presented along with thermal designs. Parametric studies and cycle studies relating to waste heat recovery from gas turbines used in LNG liquefaction plants will be provided. The economic viability of waste heat recovery and the extent to which heat integration is deployed will depend on the magnitude of the accrual of operating cost savings, and their ability to counteract the initial capital outlay. Savings can be in the form of reduced fuel gas costs and reduced carbon dioxide taxes. Ultimately the impact of these savings will depend on the owner’s measurement of the value of fuel gas; whether fuel usage is accounted for as lost feed or lost product. The negative impacts include the reduction in nitrogen rejection that occurs with reduced fuel gas usage and the power restrictions imposed on gas turbine drivers due to the increased exhaust system back-pressure caused by the presence of the WHRU. When steam systems are acceptable, a cogeneration type liquefaction facility can be attractive. In addition to steam generation and hot oil heating, newer concepts such as the use of ORCs or supercritical CO2 cycles will also be addressed.

scholarly journals Model Predictive Control of Offshore Power Stations With Waste Heat Recovery

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Leonardo Pierobon ◽  
Richard Chan ◽  
Xiangan Li ◽  
Krishna Iyengar ◽  
Fredrik Haglind ◽  
...  
Keyword(s):  
Model Predictive Control ◽  
Control Systems ◽  
Predictive Control ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Oil And Gas ◽  
Waste Heat ◽  
Integral Control ◽  
Power Stations

The implementation of waste heat recovery units on oil and gas offshore platforms demands advances in both design methods and control systems. Model-based control algorithms can play an important role in the operation of offshore power stations. A novel regulator based on a linear model predictive control (MPC) coupled with a steady-state performance optimizer has been developed in the simulink language and is documented in the paper. The test case is the regulation of a power system serving an oil and gas platform in the Norwegian Sea. One of the three gas turbines is combined with an organic Rankine cycle (ORC) turbogenerator to increase the energy conversion efficiency. Results show a potential reduction of frequency drop up to 40% for a step in the load set-point of 4 MW, compared to proportional–integral control systems. Fuel savings in the range of 2–3% are also expected by optimizing on-the-fly the thermal efficiency of the plant.

Flow Distribution Characteristics and Control in Marine Gas Turbine Diffusers

1984 ◽  
Vol 106 (3) ◽  
pp. 654-660
Author(s):  
M. K. Ellingsworth ◽  
Ho-Tien Shu ◽  
S. C. Kuo
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Flow Distribution ◽  
Distribution Characteristics ◽  
Nonuniform Flow ◽  
Technical Problems ◽  
And Control

The object of this study was to investigate flow distribution characteristics and control in the marine gas turbine diffusers most suitable for waste heat recovery systems. The major technical problems associated with nonuniform flow distributions in heat-exchanger or flow-equipment systems were reviewed. Various means to alleviate or minimize these undesirable problems were evaluated. Four sets of candidate flow-distribution data were selected from the measured exhaust velocities of typical marine gas turbines for input to the present study. A two-dimensional turbulent flow model for diffusers was developed and computerized, and five diffuser geometries suitable for marine gas turbine waste-heat recovery applications were investigated, based on the actual inlet velocity data. The exit flow distribution characteristics (velocity, mass-flux, pressure recovery, and temperature) and diffuser performance with and without flow-distribution controls were analyzed using the computer programs developed. It was found that nonuniform flow distribution in the gas turbine exhaust can reduce diffuser efficiency to half of that attainable with uniform flow, and that the diffuser exhaust velocities will be more uniform by using guide vanes and/or flow injection than merely using nonsymmetric diffusion angles. The diffuser efficiency can be improved 20 to 36 percentage points by using these contort means.

scholarly journals The Impact of Process Heat on the Decarbonisation Potential of Offshore Installations by Hybrid Energy Systems

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8123
Author(s):  
Luca Riboldi ◽  
Marcin Pilarczyk ◽  
Lars O. Nord
Keyword(s):  
Energy Storage ◽  
Gas Turbines ◽  
Co2 Emission ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Hybrid Energy ◽  
Renewable Power ◽  
Recovery Unit ◽  
Process Heat

An opportunity to decarbonise the offshore oil and gas sector lies in the integration of renewable energy sources with energy storage in a hybrid energy system (HES). Such concept enables maximising the exploitation of carbon-free renewable power, while minimising the emissions associated with conventional power generation systems such as gas turbines. Offshore plants, in addition to electrical and mechanical power, also require process heat for their operation. Solutions that provide low-emission heat in parallel to power are necessary to reach a very high degree of decarbonisation. This paper investigates different options to supply process heat in offshore HES, while the electric power is mostly covered by a wind turbine. All HES configurations include energy storage in the form of hydrogen tied to proton exchange membrane (PEM) electrolysers and fuel cells stacks. As a basis for comparison, a standard configuration relying solely on a gas turbine and a waste heat recovery unit is considered. A HES combined with a waste heat recovery unit to supply heat proved efficient when low renewable power capacity is integrated but unable to deliver a total CO2 emission reduction higher than around 40%. Alternative configurations, such as the utilization of gas-fired or electric heaters, become more competitive at large installed renewable capacity, approaching CO2 emission reductions of up to 80%.

scholarly journals New Control Systems Facilitate Reconfiguring Aeroderivative Gas Turbines for Cogeneration

1996 ◽  
Author(s):  
David Moore
Keyword(s):  
New Zealand ◽  
Control Systems ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heat Recovery Boiler ◽  
Total System ◽  
Paper Briefly ◽  
Dairy Plant

This paper briefly sets out the requirements for additional steam capacity at Anchor Products dairy plant at Te Awamutu in New Zealand and the reasons for choosing to use a relocated Turbo Power & Marine Twin Pac with a new waste heat recovery boiler together with an existing coal fired boiler to meet this demand. The paper then discusses the decision to replace the gas turbine and generator controls in their entirety, their integration with the controls for the new and existing boilers, and the architecture adopted for the total system. The philosophy of the control of the plant is then developed which leads to detailed discussion of the implementation of various modes of control of the plant, including, cogeneration control, co-ordinated control peaking control and compensate control and the methods of changing between the various modes of control. Finally, the paper includes a section on commissioning the plant.

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