CAES: Reduced to Practice

2001 ◽  
Author(s):  
John Daly ◽  
R. M. Loughlin ◽  
Mario DeCorso ◽  
David Moen ◽  
Lee Davis
Keyword(s):  
High Pressure ◽  
Learning Process ◽  
Gas Turbines ◽  
Operating Conditions ◽  
Compressed Air ◽  
Problem Solution ◽  
Fuel Injectors ◽  
Operating Modes ◽  
The Usa ◽  
The Subject

With the deregulation of the power industry, the use of peaking power solutions such as Compressed Air Energy Storage (CAES) is receiving increasing attention. The CAES plant located in McIntosh, Alabama, owned and operated by Alabama Electric Cooperative, Inc. (AEC) is the subject of this paper. It is the only such plant in the USA and one of two in the world. In off-peak hours the plant pressurizes a cavern with compressed air. During peak hours the stored cavern air is then valved through the combustion turbines to produce any level of peaking power required between 10 and 110 megawatts. This prototype plant began operating in May 1991 and its reliability has been steadily improved. This paper describes the learning process and plant-wide equipment modifications that were made to bring the plant to its present state of reliable operation. Because the CAES operating conditions and operating modes differ from conventional gas turbines, anticipated and unanticipated problems arose. The plant is made up of “combustion turbine” type components, but because of the way the plant operates (- valving of air input - relatively high pressure and air flows at startup - abrupt air flow shutoff at shutdown), certain operating experiences are unique to a CAES plant and not seen on standard gas turbine plants. Among the areas discussed are: controls, stand-by combustor, low-pressure (LP) expander, cavern well liner, lube oil, exhaust flow damper, high-pressure (HP) combustors, LP combustors, fuel injectors, fuel handling, and hot gas path instrumentation. These topics are discussed in the problem, solution, recommendation format. The learning process described in the paper will serve as an invaluable guide to plant designers as future CAES plants are built.

Didactic platform for teaching of three-phase rectifier circuits in power electronics

2014 ◽  
Vol 51 (4) ◽  
pp. 279-291 ◽  
Author(s):  
Marcelo R. S. Brito ◽  
Fernando C. Melo ◽  
Luiz C. Freitas ◽  
João B. Vieira ◽  
Ernane A. A. Coelho ◽  
...  
Keyword(s):  
Power Electronics ◽  
Learning Process ◽  
Electrical Engineering ◽  
Operating Conditions ◽  
Laboratory Activities ◽  
Mixed Use ◽  
Three Phase ◽  
The Subject ◽  
Materials Used ◽  
Rectifier Circuits

With the aim of preventing an Electrical Engineering course from being predominantly theoretical, the didactic materials used in laboratory activities are essential to make the learning process easier and more stimulating for the student. In this context, this paper presents a didactic platform developed for teaching a.c.-d.c. converters in the subject of power electronics at the Federal University of Uberlândia (UFU), Brazil. The proposed platform consists of a three-phase controlled and/or uncontrolled rectifier. The IC TCA785 is used to control thyristor operation. In order to make teaching more dynamical, the didactic platform was designed to have various operating conditions, simulating, for example, breakdown components and mixed use of thyristors and diodes. A prototype of the proposed platform was built, evaluated experimentally in the laboratory and the results are shown in this paper.

The Concept of Mechanical Part of the Model Micro-Energy Sources for Electrical Laboratories

2016 ◽  
Vol 835 ◽  
pp. 810-815 ◽  
Author(s):  
René Drtina ◽  
Jaroslav Lokvenc ◽  
Josef Šedivý ◽  
Jan Škoda
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Electrical Engineering ◽  
Renewable Energy Sources ◽  
Operating Conditions ◽  
Energy Sources ◽  
Operating Modes ◽  
Alternative Energy Sources ◽  
Asynchronous Generator ◽  
The Subject

The use of renewable (alternative) energy sources of energy is still a hot topic. In the electrical engineering laboratories of the Department of technical subjects created a model of micro energy sources that can be operated in various operating modes to simulate in various operating conditions. The machine set is dedicated for laboratory of electric engeneering. Goal is to show students in the subject Renewable energy sources and their application, practical use and parameters an the asynchronous generator. The article deals with the mechanical concept and mechanical construction of laboratory machine set.

scholarly journals Analysis of Permissibility of the Excitation Loss Mode of the Synchronous Generator in the Conditions of the Industrial Electrical Supply System

2019 ◽  
pp. 12-18
Author(s):  
Olga V. Gazizova ◽  
Alexandr P. Sokolov ◽  
Nikolay T. Patshin ◽  
Yulia N. Kondrashova
Keyword(s):  
Gas Turbines ◽  
Power Plants ◽  
Reactive Power ◽  
High Reliability ◽  
Synchronous Generator ◽  
Electrical Energy ◽  
Operating Conditions ◽  
Asynchronous Mode ◽  
Operating Modes ◽  
Industrial Enterprises

Modern operating conditions of large industrial enterprises require the provision of high reliability of power supply to consumers while reducing the cost of the electricity consumed. These requirements are ensured by the widespread introduction of own sources of electrical energy. These include combined heat and power plants, gas turbines, gas pistons and steam and gas power plants. At the same time, there is a significant complication of the industrial network configuration and possible emergency modes. One of the emergency modes in such networks is the loss of excitation of the synchronous generator. The admissibility of such a regime is specified by regulatory documents. In this situation, the generator goes into asynchronous mode and consumes reactive power from the network. The purpose of this work is to identify the admissibility of the synchronous generator operation for a certain time in the asynchronous mode as a result of the loss of excitation. An algorithm has been developed to calculate the transient electromechanical process of a synchronous generator taking into account the loss of machine excitation. Investigations have been carried out for various operating modes of an industrial power plant taking into account the initial generator load using the KATRAN software. The calculation results allow determining the generator load by active power at which the synchronous generator can operate in the asynchronous mode without excitation.

CFD Analysis of a Complete Industrial Lean Premixed Gas Turbine Combustor

2000 ◽  
Author(s):  
P. Birkby ◽  
R. S. Cant ◽  
W. N. Dawes ◽  
A. A. J. Demargne ◽  
P. C. Dhanasekaran ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Combustion Process ◽  
Operating Conditions ◽  
Combustion Model ◽  
Reacting Flow ◽  
Lean Premixed Combustion ◽  
Fuel Injectors ◽  
Lean Premixed ◽  
Industrial Gas Turbines ◽  
Combustion Technology

The introduction of lean premixed combustion technology in industrial gas turbines has led to a number of interesting technical issues. Lean premixed combustors are especially prone to acoustically-coupled combustion oscillations as well as to other problems of flame stability such as flashback. Clearly it is very important to understand the physics that lies behind such behaviour in order to produce robust and comprehensive remedies, and also to underpin the future development of new combustor designs. Simulation of the flow and combustion using Computational Fluid Dynamics (CFD) offers an attractive way forward, provided that the modelling of turbulence and combustion is adequate and that the technique is applicable to real industrial combustor geometries. The paper presents a series of CFD simulations of the Rolls-Royce Trent industrial combustor carried out using the McNEWT unstructured code. The entire combustion chamber geometry is represented including the premixing ducts, the fuel injectors and the discharge nozzle. A modified k-ε model has been used together with an advanced laminar flamelet combustion model that is sensitive to variations in fuel-air mixture stoichiometry. Detailed results have been obtained for the non-reacting flow field, for the mixing of fuel and air and for the combustion process itself at a number of different operating conditions. The study has provided a great deal of useful information on the operation of the combustor and has demonstrated the value of CFD-based combustion analysis in an industrial context.

Expanded Tube Joints in Boiler Drums with Special Reference to the Battersea High-Pressure Boilers

1946 ◽  
Vol 154 (1) ◽  
pp. 52-93 ◽  
Author(s):  
W. B. Shannon ◽  
C. W. Pratt ◽  
T. B. Webb ◽  
W. B. Carlson
Keyword(s):  
High Pressure ◽  
Mild Steel ◽  
Historical Review ◽  
Operating Conditions ◽  
Original Design ◽  
Experimental Development ◽  
Holding Power ◽  
Steel Tubing ◽  
The Subject ◽  
Steel Drums

Particulars are given of the major pressure parts of two high-pressure boilers installed at Battersea Power Station, each comprising four alloy steel drums and their interconnecting mild steel tubing. Their design and working conditions are described, and a historical review is presented of their erection and of problems which arose whilst rendering the expanded tube joints leakproof. The gradual resolution of these problems is then traced through several stages. It was realized that the leakage was fundamentally due to the elastic strain which occurs in the tube holes of highly stressed drums, which, at Battersea, amounts to about twice that pertaining to mild steel drums. The holding power of the joint is thus relaxed to an abnormal extent, sufficient to permit leakage. The elastic deflexions, or total “spring” of the joint, resulting from the expanding operation, must therefore be correspondingly increased to accommodate the increased drum strain. Various suggested methods of achieving this are reviewed. Insertion ferrules were selected as the most promising, and experimental development tests to investigate its possibilities are described. A full-scale rehearsal of the method carried out on one of the steam receivers is recorded, and this is followed by a description of the final ferruling and testing of both boilers. A number of general observations and conclusions are given, and the subject of leakage and its causes is discussed in some detail. It is concluded that full advantage can be taken of the benefits which result from the use of high-tensile steel boiler drums, with mild steel tubes expanded into the drums. It is, however, essential that in the design stages the expected operating conditions of the expanded joints should be investigated on the lines suggested in this paper. The adoption of high-tensile steel ferrules as a feature of original design is justified by the results obtained at Battersea.

Applying Circle Game to Enhance Students’ Speaking Skill

2020 ◽  
Vol 7 (2) ◽  
pp. 119
Author(s):  
Putri Denaya Side Ayu ◽  
Heri Hidayatullah ◽  
Sri Ariani
Keyword(s):  
Action Research ◽  
Learning Process ◽  
Active Involvement ◽  
Post Test ◽  
Speaking Skill ◽  
The Subject ◽  
The Mean ◽  
Classroom Action Research ◽  
Speaking Skills

This Collaborative Classroom Action Research aimed at enhancing students’ speaking skill through the application of Circle Game. It was conducted in one cycle consisting of two meetings. The subject was the seventh of C class of SMPN 2 Alas Barat consisting of 22 students. The types of data were qualitative (acquiring observation during the learning process) and quantitative (speaking tests). The results qualitatively showed that the implementation of Circle Game enhanced the students’ speaking skills. Such improvement could be seen from their enthusiasm, their interesting feeling in various materials presented by the teacher, their active involvement. In the quantitative findings, the result also showed a higher value of the mean score of the post-test (77.34) rather than the pre-test (75.75). In conclusion, the use of Circle Game can improve students’ speaking skill.

PENERAPAN METODE DISKUSI UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS I SDN 004 TEMBILAHAN KOTA KECAMATAN TEMBILAHAN KABUPATEN INDRAGIRI HILIR

2018 ◽  
Vol 2 (2) ◽  
pp. 173
Author(s):  
Jaimah Jaimah
Keyword(s):  
Action Research ◽  
Initial Data ◽  
Learning Outcomes ◽  
Learning Process ◽  
Mathematics Learning ◽  
First Grade ◽  
Average Value ◽  
Concrete Objects ◽  
The Subject ◽  
Classroom Action Research

The background of this research is the low of mathematics learning result of grade 1 student of SDN 004Tembilahan Kota, for that done perbaiakan learning process by applying method of discussion. This researchwas conducted in SDN 004 Tembilahan Kota with the subject of research is the first grade students with 36students. This research is a classroom action research conducted two cycles. Based on the results of theresearch, it is found that the use of the method of disuksi can improve the students' learning outcomes aboutknowing and determining the length and weight with nonstandard units using concrete objects / concretesituation in the initial data, the total number of completed students is 12 students (33.3%) average 55.83. In thefirst cycle has increased the number of students who complete is 26 students (77.22%) with an average value of80.00. In the second cycle has increased with the total number of students who completed is 32 students (88.89)with an average value of 88.06.

HUBUNGAN PROFESIONALISME PENDIDIK TK DENGAN KINERJA PENDIDIK DI TK RAYON IV KOTA DUMAI

2019 ◽  
Vol 3 (3) ◽  
pp. 660
Author(s):  
Ranirizal Ranirizal
Keyword(s):  
Learning Process ◽  
Subject Matter ◽  
Significant Relationship ◽  
Teacher Performance ◽  
Teacher Professionalism ◽  
Learning Material ◽  
The Subject ◽  
Performance Development ◽  
Kindergarten Educators ◽  
Academic Qualifications

Performance is the performance shown by educators, both in quality and quantity in carrying out their duties in accordance with the responsibilities given to them professionally. Educator performance development is a very decisive factor in the success of the education and learning process. In fact, in Kindergarten Rayon IV, Dumai City, there is still a low level of competency standards possessed by educators. The intended competency standard is from the standard academic qualifications and four competencies that must be possessed by a kindergarten educator, namely pedagogic, professional, social and personality competencies. This is evidenced by educators not yet mastering learning material with the maximum known when the learning process educators are not able to explain well the subject matter, and educators have not shown maximum performance in carrying out their duties and functions. The purpose of this study was to see whether there was an influence on teacher professionalism on teacher performance in Dumai IV Rayon Kindergarten. The results of the study prove that there is a significant relationship between the professionalism of Kindergarten educators and the performance of educators in Kindergarten Rayon IV, Dumai City. This is evidenced by the value of Sig (2-tailed) professionalism on educator's performance of 0,000, so the calculation shows 0,000 <0.05. This means that Ha is accepted, that is, there is a significant relationship between the professionalism of Kindergarten educators and the Performance of Educators in Kindergarten Rayon IV, Dumai City.

Distributed Modeling Of Building Systems Through Cyber-Physical Integration

2019 ◽  
pp. 12-17
Keyword(s):  
Data Structure ◽  
Operating Conditions ◽  
Physical Models ◽  
Distributed Model ◽  
Physical Processes ◽  
Distributed Modeling ◽  
Distributed Models ◽  
Operating Modes ◽  
Building Systems ◽  
Important Practical Application

This article describes the proposed approaches to creating distributed models that can, with given accuracy under given restrictions, replace classical physical models for construction objects. The ability to implement the proposed approaches is a consequence of the cyber-physical integration of building systems. The principles of forming the data structure of designed objects and distributed models, which make it possible to uniquely identify the elements and increase the level of detail of such a model, are presented. The data structure diagram of distributed modeling includes, among other things, the level of formation and transmission of signals about physical processes inside cyber-physical building systems. An enlarged algorithm for creating the structure of the distributed model which describes the process of developing a data structure, formalizing requirements for the parameters of a design object and its operating modes (including normal operating conditions and extreme conditions, including natural disasters) and selecting objects for a complete group that provides distributed modeling is presented. The article formulates the main approaches to the implementation of an important practical application of the cyber-physical integration of building systems - the possibility of forming distributed physical models of designed construction objects and the directions of further research are outlined.

IMPROVING THE STUDENTS’ READING COMPREHENSION ACHIEVEMENT IN DESCRIPTIVE TEXT THROUGH TEAM GAMES TOURNAMENT

2014 ◽  
Vol 3 (3) ◽  
Author(s):  
DesiYusnanda Sari And Sri MindaMurni
Keyword(s):  
Reading Comprehension ◽  
Learning Process ◽  
Quantitative Data ◽  
Qualitative Data ◽  
Reading Scores ◽  
Team Games ◽  
The Subject ◽  
The Mean ◽  
Teaching Learning ◽  
Data Reading

This study attempted to improve the students’ reading comprehension achievement in descriptive text through Team Games Tournament (TGT) method. This study was conducted by using classroom action research. The subject of the research was class IX SMP PAB 10 Medan Estate which consisted of 25 students. The research was conducted in two cycles and the first cycle consisted of four meetings the second cycle consisted of two meetings. The instruments for collecting the data were quantitative data (reading evaluation) and qualitative data (diary note, observation sheet and interview sheet). Based on reading scores, students’ score kept improving in every evaluation. In the test I the mean was 65,33, in the test II the mean was 71,72 and the test III the mean was 84,54.Based on diary note, observation sheet and interview sheet, it was found that teaching-learning process ran well. Students were active, enthusiastic, and interested in reading. The result of the research showed that Team Games Tournament (TGT) method significantly improved students’ achievement in reading comprehension especially in reading descriptive text.

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