Gas Turbine Performance Optimization Using Compressor Online Water Washing Technique

Ogbonnaya, Ezenwa A.

doi:10.4236/eng.2011.35058

Cited by 15 publications

(7 citation statements)

References 15 publications

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“… The research by Ogbonnaya (2011) showed that the compressor efficiency and the overall operational efficiency were improved to 82 percent and 45.8 percent with optimized online water-washing. However, frequent compressor blade washing behaviors can increase the operational and maintenance (O&M) costs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Effectiveness of Online Water-Washing in Gas Turbine Compressors

Brun

Foiles

Grimley

et al. 2014

Volume 3B: Oil and Gas Applications; Organic Rankine Cycle Power Systems; Supercritical CO2 Power Cycles; Wind Energy

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An investigation of the effectiveness of online combustion turbine axial compressor washing using various purity grade waters and commercial washing detergents was performed. For this project, blade surface fouling dirt was obtained from gas turbine axial compressor blades installed at various field sites. The dirt was analyzed to determine the composition and consistency of typical blade surface fouling materials. A representative dirt formula and blade coating procedure was developed so that comparative tests could be performed using various cleaning fluids. Dirt coated blades were installed in a wind tunnel capable of simulating compressor operating conditions. A spray nozzle upstream of the blade test section was used for washing blades with five different test liquids to determine the effectiveness or advantages of any liquid. Once this testing was completed, a similar test setup was then utilized to inject a mixture of formulated fouling dirt and the various online cleaning liquids upstream of the blade into the wind tunnel to assess redeposit characteristics. The effect of high-purity water versus regular water on fouling dirt was also studied in separate residue experiments. Results indicate that spraying cleaning fluid into a flowing air stream is a viable means of cleaning a compressor blade. Each of the fluids was able to clean the test blade at both low and high air velocities and at different blade incident angles. Within the parameters/fluids tested, the results indicate that: 1. The blade cleaning is primarily a mechanical function and does not depend on the type of fluid used for cleaning. The results showed that most of the cleaning occurs shortly after the cleaning fluid is introduced into the flow stream. 2. Dirt removed from the blades may redeposit in other areas as the cleaning fluid is evaporated. Redeposit occurred in flow recirculation zones during the cleaning tests, and heated flow tests demonstrated dirt deposit in the presence of a cleaning fluid. In addition, the type of fluid used for cleaning has no effect on the redeposit characteristics of the dirt. 3. Blade erosion was not found to be a significant issue for the short durations that online water-washing was performed. However, uncontrolled water-washing (or overspray) for extended periods of time did result in measureable leading and trailing edge blade erosions.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Effectiveness of Online Water-Washing in Gas Turbine Compressors

Brun

Foiles

Grimley

et al. 2014

Volume 3B: Oil and Gas Applications; Organic Rankine Cycle Power Systems; Supercritical CO2 Power Cycles; Wind Energy

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“…It mainly includes: compressor corrosion and blade washing [2][3], modelling and optimization of multiphase flow in online washing [4] as well as the analysis of the effect of washing on engine performance [5][6] and so on. Domestic research on washing technology has just started and mainly focuses on shore-based aero engines.…”

Section: Introductionmentioning

confidence: 99%

Design of Online Washing Process for an Engine Based on Washing Experiments

Zhang

et al. 2017

MATEC Web Conf.

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Abstract. In order to develop online washing process of a carrier-based aircraft engine and improve washing efficiency, washing equipments were employed in cold operation state to carry out experimental study on structural strength of spray frame, selection of nozzle and determination of injection parameters of online washing spray system, determination of washing injection timing, determination of drying procedure, liquid-washing experiments of different concentrations and water-washing experiments and so on. The results show that if engine is washed in cold operation state, mid-nozzle with upward offset angel of 7 30 can be selected and the feed liquid pressure provided by washing vehicle is 0.9Mpa. The start time is 20s after an engine cold start-up, and sustains 30s for once washing. After a liquid-washing with the use of washing fluid, the liquid concentration of which is no more than 20%, twice water-washing can be carried out to rinse the almost all cleaning agent remaining in the engine runner(the residue is less than 1%). The engine can be thoroughly dried by power-on operation, the procedure of which is engine operating 2min in ideal state, then 2min in state of n2 85 and 2min of ideal state lastly. Washing will not affect the engine function.

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“…The experimental setup to actualize the optimization technique is shown in figure 3. The turbotech equipment is manually operated using a hand pump that injects the deminerialized water (Ogbonnaya, 2011). Equation (10) was used in developing a software, code named the VANCANAL, written in figure 4.…”

Section: The Optimization Techniquesmentioning

confidence: 99%

“…With increasing operating time, degradation of compressors manifest in the form of reduced performance. The major cause of reduction in compressor efficiency and inlet air mass flow is fouling (Ogbonnaya, 2011). Other forms of site conditions are abrasion and erosion of the blade surfaces.…”

Section: Introductionmentioning

confidence: 99%

A Model-Based Mixed Data Approach for Optimizing the Performance of an Offshore Gas Turbine Compressor

Ogbonnaya¹,

Ugwu²,

Diema³

2013

JVWP

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Gas turbines play prominent role in aviation, power generation, marine, mining, petrochemicals, onshore and offshore oil and gas industries. Environmental factors result to degradation mechanics of the overall performance of the engine. Industrialist therefore face unplanned equipment and manufacturing downtime which is undesirable because it leads to economic losses and costly repairs. While condition monitoring is used to obtain early warning of impending equipment failure, optimization techniques such as water washing (online and offline) are used to bring the engine/equipment back to lime-light. In this work, several schedule visits were made to a gas turbine plant on industrial duty for electricity generation in an offshore thermal station at Ibeno, near Eket, Akwa Ibom State in Nigeria. Continuous monitoring of the aerothermodynamics and vibration data were taken for a period of twelve months on hourly basis to examine the state of health of the engine due to adverse offshore environmental factors. The diagnostic approach of vibration analysis, trend and performance monitoring were used with a model-based mixed data approach for optimizing the performance of the offshore gas turbine plant.A software code-named VANCANAL written in C ++ programming language was used to proactively monitor the gas turbine plant. The software displayed the operational (actual) values of all the parameters of the engine against their designed (reference) values. Once a set limit is exceeded, the software is capable of giving an alarm, signifying the need for maintenance.

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Gas Turbine Performance Optimization Using Compressor Online Water Washing Technique

Cited by 15 publications

References 15 publications

Experimental Evaluation of the Effectiveness of Online Water-Washing in Gas Turbine Compressors

Experimental Evaluation of the Effectiveness of Online Water-Washing in Gas Turbine Compressors

Design of Online Washing Process for an Engine Based on Washing Experiments

A Model-Based Mixed Data Approach for Optimizing the Performance of an Offshore Gas Turbine Compressor

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