NORTH RANKIN 'A' GAS RECYCLING PROJECT — DESIGN, CONSTRUCTION AND COMMISSIONING

1988 ◽  
Vol 28 (1) ◽  
pp. 68
Author(s):  
D.J. Holt ◽  
C. de Jong ◽  
D.G. Rowell
Keyword(s):  
Gas Turbine ◽  
Production Capacity ◽  
Injection Wells ◽  
Total Recovery ◽  
The North ◽  
Start Up ◽  
Excess Production ◽  
Major Incidents ◽  
Early Production ◽  
Gas Recycling

Gas recycling, to increase early production and total recovery of hydrocarbon condensate, was implemented on the North Rankin 'A' platform to take advantage of excess production capacity prior to the commencement of the LNG export phase. By recycling excess 'dry' gas back into the reservoir, condensate production has been doubled, to around 3 000 kl per day (19 000 barrels) per day and ultimate recovery increased.The additional facilities installed included five injection wells, an additional production well, and a 23 MW gas turbine driven gas recompression facility that was retrofitted within existing facilities on the platform. Designed in-house, the facility involved relocation of some operating plant and piecemeal installation of a new 400 tonne module containing a 23 MW aero-derivative gas turbine driven high pressure (30 MPa) centrifugal compressor and ancillary equipment. The compressor set was extensively tested under full load conditions at the manufacturer's works in France before delivery.Offshore construction was complicated by the congested working area and the difficulties of working in and integrating with live production facilities but was completed without major incidents or causing undue interference to platform production. Commissioning proceeded quite smoothly. Full operation was achieved within ten days of initial start-up, and the facility has continued to yield impressive production results.

GEOLOGICAL AND RESERVOIR ENGINEERING CONSIDERATIONS FOR THE NORTH RANKIN GAS RECYCLING PROJECT

1988 ◽  
Vol 28 (1) ◽  
pp. 54
Author(s):  
C. Barker ◽  
P. Vincent
Keyword(s):  
Development Project ◽  
Reservoir Engineering ◽  
Recycling Rate ◽  
Well Testing ◽  
Well Performance ◽  
Sweep Efficiency ◽  
Spare Capacity ◽  
Injection Wells ◽  
The North ◽  
Gas Recycling

The North Rankin Field, situated in the Dampier Sub-basin offshore north-western Australia, is being developed as part of the North West Shelf Development Project. Substantial excess production capacity from the field exists until liquified natural gas exports to Japan plateau in late 1993. A recycling project was proposed to utilise this spare capacity. Gas produced in excess of current sales volumes is stripped of its condensate, and the lean gas is reinjected into the reservoir thereby increasing condensate production and the total recovery.The North Rankin A Gas Recycling Project was commissioned in June 1987 and its performance to date has been better than original expectations. The average recycling rate during the first few months of operation was approximately 13 x 106sm3/d (450 MMscfd) with associated condensate production of 1600 m3/d (10,000 STB/d). Studies suggest that the total recycled volume for the project, up until late 1993, may be in the order of 19 x 109sm3 (0.7 Tcf) with additional condensate recovery of approximately 2 million cubic metres (13 MMSTB).The design and implementation of subsurface aspects of the recycling project required close co-operation between the geological and reservoir engineering disciplines. Detailed studies were undertaken to determine reservoir extent and communication within the field in order to identify likely paths for lateral and vertical gas movement. Estimates of swept reservoir volumes were used to determine injected lean gas distributions. These gas distributions, in conjunction with operational aspects, formed the basis for the production and injection policy developed to maximise sweep efficiency and optimise condensate recovery from the recycling project.Multiple zone through tubing perforation was needed in most injection wells. The initial perforation was performed with an optimal underbalance pressure. Subsequent perforation was neutrally balanced. The degree of underbalance while perforating has a significant effect on perforation efficiency and simple models were used to predict this.Accurate estimates of well injectivity must be made to ensure that the perforation design allows well target rates to be met. Numerical reservoir and wellbore models were constructed to evaluate well injection potentials and gas distributions.To verify the design procedures and well performance, well testing and production logging was carried out before and after the start up of gas recycling. Production logging surveys in the injection wells and measuring condensate gas ratios in the producers are essential in monitoring the performance of gas recycling.

scholarly journals Assessing the Retention Potential of Conservation Reserve Program Practices in Alabama

1999 ◽  
Vol 23 (2) ◽  
pp. 83-87 ◽  
Author(s):  
Okwudili O. Onianwa ◽  
Gerald C. Wheelock ◽  
Mark R. Dubois ◽  
Sarah T. Warren
Keyword(s):  
Soil Loss ◽  
Crop Production ◽  
Conservation Reserve Program ◽  
Production Capacity ◽  
Tree Planting ◽  
Conservation Practice ◽  
Row Crop ◽  
Excess Production ◽  
Intended Use

Abstract Conservation reserve program (CRP) participants in Alabama were surveyed to determine the probable utilization of CRP acres should the contracts expire without opportunity for renewal. From over 9000 contracts established between 1986 and 1995, 594 contracts were randomly selected and surveyed for the study. Two hundred and fourteen surveys were completed and returned. Of these, 204 (34%) were usable. Results indicate that 90% of CRP tree acres would be retained in trees while nearly 60% of CRP grass acres would be converted to row crop production. In addition, there are no significant differences in the response between the minority and white participants with regard to the intended use of CRP acres. Therefore, for sustained mitigation of soil loss and reduction of excess production capacity, tree planting as a conservation practice choice should be advocated and encouraged. South. J. Appl. For. 23(2):83-87.

Staged Premix EV Combustion in Alstom’s GT24 Gas Turbine Engine

2012 ◽  
Author(s):  
Daniel Guyot ◽  
Thiemo Meeuwissen ◽  
Dieter Rebhan
Keyword(s):  
Gas Turbine ◽  
Distribution System ◽  
Fuel Oil ◽  
Operational Flexibility ◽  
Nox Formation ◽  
Diffusion Type ◽  
Fuel Gas ◽  
Start Up ◽  
Reduce Emissions ◽  
Ev Burner

Reducing gas turbine emissions and increasing their operational flexibility are key targets in today’s gas turbine market. In order to further reduce emissions and increase the operational flexibility of its GT24, Alstom has introduced an internally staged premix system into the GT24’s EV combustor. This system features a rich premix mode for GT start-up and a lean premix mode for GT loading and baseload operation. The fuel gas is injected through two premix stages, one injecting fuel into the burner air slots and one injecting fuel into the centre of the burner cone. Both premix stages are in continuous operation throughout the entire operating range, i.e. from ignition to baseload, thus eliminating the previously used pilot operation during start-up with its diffusion-type flame and high levels of NOx formation. The staged EV combustion concept is today a standard on the current GT26 and GT24. The EV burners of the GT26 are identical to the GT24 and fully retrofittable into existing GT24 engines. Furthermore, engines operating only on fuel gas (i.e. no fuel oil operation) no longer require a nitrogen purge and blocking air system so that this system can be disconnected from the GT. Only minor changes to the existing GT24 EV combustor and fuel distribution system are required. This paper presents validation results for the staged EV burner obtained in a single burner test rig at full engine pressure, and in a GT24 field engine, which had been upgraded with the staged EV burner technology in order to reduce emissions and extend the combustor’s operational behavior.

Dynamic Simulation of a HRSG System for a Given Start-Up/Shut Down Curve

2011 ◽  
Author(s):  
Hun Cha ◽  
Yoo Seok Song ◽  
Kyu Jong Kim ◽  
Jung Rae Kim ◽  
Sung Min KIM
Keyword(s):  
Dynamic Analysis ◽  
Gas Turbine ◽  
Flow Rate ◽  
Exhaust Gas ◽  
Fuel Flow Rate ◽  
Fuel Flow ◽  
Start Up ◽  
Gas Turbine Exhaust ◽  
Main Steam ◽  
Duct Burner

An inappropriate design of HRSG (Heat Recovery Steam Generator) may lead to mechanical problems including the fatigue failure caused by rapid load change such as operating trip, start-up or shut down. The performance of HRSG with dynamic analysis should be investigated in case of start-up or shutdown. In this study, dynamic analysis for the HRSG system was carried out by commercial software. The HRSG system was modeled with HP, IP, LP evaporator, duct burner, superheater, reheater and economizer. The main variables for the analysis were the temperature and mass flow rate from gas turbine and fuel flow rate of duct burner for given start-up (cold/warm/hot) and shutdown curve. The results showed that the exhaust gas condition of gas turbine and fuel flow rate of duct burner were main factors controlling the performance of HRSG such as flow rate and temperature of main steam from final superheater and pressure of HP drum. The time delay at the change of steam temperature between gas turbine exhaust gas and HP steam was within 2 minutes at any analysis cases.

Experimental Study of a 200 kW Partial Oxidation Gas Turbine (POGT) for Co-Production of Power and Hydrogen-Enriched Fuel Gas

2009 ◽  
Author(s):  
Joseph Rabovitser ◽  
Stan Wohadlo ◽  
John M. Pratapas ◽  
Serguei Nester ◽  
Mehmet Tartan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Turbine ◽  
Partial Oxidation ◽  
Synthesis Gas ◽  
Combustion Products ◽  
Working Fluid ◽  
Fuel Gas ◽  
Lean Combustion ◽  
Start Up ◽  
Oxidation Reactor

Paper presents the results from development and successful testing of a 200 kW POGT prototype. There are two major design features that distinguish POGT from a conventional gas turbine: a POGT utilizes a partial oxidation reactor (POR) in place of a conventional combustor which leads to a much smaller compressor requirement versus comparably rated conventional gas turbine. From a thermodynamic perspective, the working fluid provided by the POR has higher specific heat than lean combustion products enabling the POGT expander to extract more energy per unit mass of fluid. The POGT exhaust is actually a secondary fuel gas that can be combusted in different bottoming cycles or used as synthesis gas for hydrogen or other chemicals production. Conversion steps for modifying a 200 kW radial turbine to POGT duty are described including: utilization of the existing (unmodified) expander; replacement of the combustor with a POR unit; introduction of steam for cooling of the internal turbine structure; and installation of a bypass air port for bleeding excess air from the compressor discharge because of 45% reduction in combustion air requirements. The engine controls that were re-configured for start-up and operation are reviewed including automation of POGT start-up and loading during light-off at lean condition, transition from lean to rich combustion during acceleration, speed control and stabilization under rich operation. Changes were implemented in microprocessor-based controllers. The fully-integrated POGT unit was installed and operated in a dedicated test cell at GTI equipped with extensive process instrumentation and data acquisition systems. Results from a parametric experimental study of POGT operation for co-production of power and H2-enriched synthesis gas are provided.

Exergoeconomic Analysis of the Cycle of Cogeneration of Power, Cooling and Freshwater for a Residential Complex in Iran

2021 ◽  
Author(s):  
Mohammad Javad Bazregari ◽  
Mahdi Gholinejad ◽  
Yashar Peydayesh ◽  
Nima Norouzi ◽  
Maryam Fani
Keyword(s):  
Ambient Temperature ◽  
Gas Turbine ◽  
Production Capacity ◽  
Residential Building ◽  
Steam Generation ◽  
Absorption Chiller ◽  
Cost Rate ◽  
Fuel Flow ◽  
Bandar Abbas ◽  
Exergoeconomic Analysis

This research presents a system to use natural gas to meet electricity, freshwater and cooling needs for a residential building in Bandar Abbas. The system includes a gas turbine, absorption chiller and multi-effect desalination (MED) plant. The energy produced in the gas turbine is used to generate electricity, and the excess energy is used to produce cooling and freshwater. Finally, an exergoeconomic evaluation of the system is performed. The effects of ambient temperature on the output power as well as the exergy current have been investigated. The COP of the absorption cycle has been investigated, and the results show that at an operating temperature of 150∘C compared to 90∘C, the efficiency rate increases to 20%. The highest exergoeconomic cost rate is related to absorption chiller, and the lowest is related to heat recovery steam generation. The results show that if the ambient temperature increases, the production capacity decreases. Increasing the fuel flow rate increases the power. Evaluation of two different solutions to reduce the ambient temperature and increase the fuel flow shows that increasing the fuel flow is a better solution, considering the exergy cost of the absorption chiller, which is 10 times higher than that of the gas turbine.

Development of Reliable NARX Models of Gas Turbine Cold, Warm and Hot Start-Up

2017 ◽  
Author(s):  
Hilal Bahlawan ◽  
Mirko Morini ◽  
Michele Pinelli ◽  
Pier Ruggero Spina ◽  
Mauro Venturini
Keyword(s):  
Gas Turbine ◽  
Training Data ◽  
Series Data ◽  
Data Sets ◽  
Control Logic ◽  
Start Up ◽  
Hot Start ◽  
Narx Models ◽  
Set Up ◽  
Rapid Transients

This paper documents the set-up and validation of nonlinear autoregressive exogenous (NARX) models of a heavy-duty single-shaft gas turbine. The considered gas turbine is a General Electric PG 9351FA located in Italy. The data used for model training are time series data sets of several different maneuvers taken experimentally during the start-up procedure and refer to cold, warm and hot start-up. The trained NARX models are used to predict other experimental data sets and comparisons are made among the outputs of the models and the corresponding measured data. Therefore, this paper addresses the challenge of setting up robust and reliable NARX models, by means of a sound selection of training data sets and a sensitivity analysis on the number of neurons. Moreover, a new performance function for the training process is defined to weigh more the most rapid transients. The final aim of this paper is the set-up of a powerful, easy-to-build and very accurate simulation tool which can be used for both control logic tuning and gas turbine diagnostics, characterized by good generalization capability.

scholarly journals Start-up and Self-sustain Test of 500 W Ultra-Micro Gas Turbine Generator

2013 ◽  
Vol 476 ◽  
pp. 012060 ◽  
Author(s):  
Jeong Min Seo ◽  
Jun Young Park ◽  
Bum Seog Choi
Keyword(s):  
Gas Turbine ◽  
Turbine Generator ◽  
Micro Gas Turbine ◽  
Start Up

scholarly journals Method of coordinating air starter and auxiliary power unit joint operation

2020 ◽  
pp. 5-13
Author(s):  
Grigory Popov ◽  
◽  
Vasily Zubanov ◽  
Valeriy Matveev ◽  
Oleg Baturin ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Power Unit ◽  
Gas Turbine Engine ◽  
Working Process ◽  
Joint Operation ◽  
Turbine Engine ◽  
Auxiliary Power Unit ◽  
Auxiliary Power ◽  
Start Up ◽  
Air Turbine

The presented work provides a detailed description of the method developed by the authors for coordinating the working process of the main elements of the starting system for a modern gas turbine engine for a civil aviation aircraft: an auxiliary power unit (APU) and an air turbine – starter. This technique was developed in the course of solving the practical problem of selecting the existing APU and air turbine for a newly created engine. The need to develop this method is due to the lack of recommendations on the coordination of the elements of the starting system in the available literature. The method is based on combining the characteristics of the APU and the turbine, reduced to a single coordinate system. The intersection of the characteristic’s lines corresponding to the same conditions indicates the possibility of joint operation of the specified elements. The lack of intersection indicates the impossibility of joint functioning. The calculation also takes into account losses in the air supply lines to the turbine. The use of the developed method makes it possible to assess the possibility of joint operation of the APU and the air turbine in any operating mode. In addition to checking the possibility of functioning, as a result of the calculation, specific parameters of the working process at the operating point are determined, which are then used as initial data in calculating the elements of the starting system, for example, determining the parameters of the turbine, which in turn allow providing initial information for calculating the starting time or the possibility of functioning of the starting system GTE according to strength and other criteria. The algorithm for calculating the start-up time of the gas turbine engine was also developed by the authors and implemented in the form of an original computer program. Keywords: gas turbine engine start-up, GTE starting system, air turbine, methodology, joint work, auxiliary power unit, power, start-up time, characteristics matching, coordination, operational characteristics, computer program.

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