• Title/Summary/Keyword: gas load

Search Result 1,097, Processing Time 0.037 seconds

Comparative Part Load Performance Analysis of Gas Turbine Power Generation Systems Considering Exhaust Heat Utilization (배열 이용도를 고려한 가스터빈 발전시스템의 부분부하 성능 비교분석)

  • Kim, T. S.
    • 유체기계공업학회:학술대회논문집
    • /
    • 2002.12a
    • /
    • pp.290-297
    • /
    • 2002
  • This paper presents analysis results for the effect of power control strategies on the part load performance of gas turbine based power generation systems utilizing exhaust heat of the gas turbine such as cumbined cycle power plants and regenerative gas turbines. For the combined cycle, part load efficiency variations were compared among different single shaft gas turbines representing various technology levels. Power control strategies considered were fuel only control and IGV control. It has been observed that gas turbines with higher design performances exhibit superior part load performances. Improvement of part load efficiency by adopting air flow modulation was analyzed and it is concluded that since the average combined cycle performance is affected by the range of IGV control as well as its temperature control principle, a control strategy appropriate for the load characteristics of the individual plant should be adopted. For the regenerative gas turbine, it is likewise concluded that maintaining exhaust temperature as high as possible by air flow rate modulation is required to increase part load efficiency.

  • PDF

Comparative Part Load Performance Analysis of Gas Turbine Power Generation Systems Considering Exhaust Heat Utilization (배열 이용도를 고려한 가스터빈 발전시스템의 부분부하 성능 비교분석)

  • Kim, T.S.
    • The KSFM Journal of Fluid Machinery
    • /
    • v.6 no.3 s.20
    • /
    • pp.28-35
    • /
    • 2003
  • This paper presents analysis results for the effect of power control strategies on the part load performance of gas turbine based power generation systems utilizing exhaust heat of the gas turbine such as combined cycle power plants and regenerative gas turbines. For the combined cycle, part load efficiency variations were compared among different single shaft gas turbines representing various technology levels. Power control strategies considered were fuel only control and IGV control. It has been observed that gas turbines with higher design performances exhibit superior part load performances. Improvement of part load efficiency of the combined cycle by adopting air flow modulation was analyzed and it was concluded that since the average combined cycle performance is affected by the range of IGV control as well as its temperature control principle, a control strategy appropriate for the load characteristics of the individual plant should be adopted. For the regenerative gas turbine, it is likewise concluded that maintaining exhaust temperature as high as possible by air flow rate modulation is required to increase part load efficiency.

Load Management of Natural Gas (천연가스 부하관리)

  • Choi, Keum-Nam;Kim, Yong-Chan;Hong, Hi-Ki;Kim, Sang-No;Kim, In-Taek;Jeon, Ho-Cheol
    • Proceedings of the SAREK Conference
    • /
    • 2006.06a
    • /
    • pp.264-269
    • /
    • 2006
  • Efficient load management on natural gas is strongly required to allow stable and reasonable energy use. The present study investigated domestic and international cases for demand management of natural gas. The directions of load management were discussed. The reasonable evaluation methods of demand management were analyzed and specific evaluation items were suggested.

  • PDF

Experimental Study on the Load Carrying Performance and Driving Torque of Gas Foil Thrust Bearings (가스 포일 스러스트 베어링의 하중지지 성능 및 구동 토크에 관한 실험적 연구)

  • Kim, Tae Ho;Lee, Tae Won;Park, Moon Sung;Park, Jungmin;Kim, Jinsung;Jeong, Jinhee
    • Tribology and Lubricants
    • /
    • v.31 no.4
    • /
    • pp.141-147
    • /
    • 2015
  • Gas foil thrust bearings (GFTBs) have attractive advantages over rolling element bearings and oil film thrust bearings, such as oil-free operation, high speed stability, and high-temperature operation. However, GFTBs have lower load carrying capacity than the other two types of bearings owing to the inherent low gas viscosity. The load carrying capacity of GFTBs depends mainly on the compliance of the foil structure and the formed hydrodynamic wedge, where the gas pressure field is generated between the top foil and the thrust runner. The load carrying capacity of the GFTBs is very important for the suitable design of oil-free turbomachinery with high performance. The aim of the present study is to identify the characteristics of the load carrying performance of GFTBs. A new test rig for the experimental measurements is designed to provide static loads up to 800 N using a pneumatic cylinder. The maximum operating speed of the driving motor is 30,000 rpm. A series of experimental tests—lift-off test, static load performance test, and maximum load capacity test—estimate the performance of a six-pad GFTB, in terms of the static load, driving torque, and temperature. The maximum load capacity is determined by increasing the static load until the driving torque rises suddenly with a sharp peak. The test results show that the torque and temperature increase linearly with the static load. The estimated maximum load capacity per unit area is approximately 80.5 kPa at a rotor speed of 25,000 rpm. The test results can be used as a design guideline for GFTBs for realizing oil-free turbomachinery.

An Economic Analysis of the Natural Gas Air-conditioning (가스냉방의 경제성 분석)

  • Gim, Bong-Jin;Park, Yearn-Hong
    • IE interfaces
    • /
    • v.11 no.1
    • /
    • pp.207-214
    • /
    • 1998
  • Since the natural gas air-conditioning not only increases the base load of the gas company but also decreases the summer peak load of the electricity company, it is considerded as an efficient demand-side management program. This paper suggests the economic evaluation method of the gas air-conditioning program from the perspectives of the participants, the pipeline gas company, the local distribution company, the electricity company, and the total resources. The absorption type gas air-conditioning/space-heating is selected as a case study to illustrate the economic analysis of the natural gas air-conditioning.

  • PDF

Reliability testing equipment for SF_6 gas load break switch (가스절연부하개폐기의 신뢰성 평가장비)

  • Heo J.C.;Park S.J.;Kang Y.S.;Koh H.S.
    • Proceedings of the KIEE Conference
    • /
    • summer
    • /
    • pp.560-562
    • /
    • 2004
  • $SF_6$ gas has been increasingly used as the insulating and arc-suppressing medium in switchgears which are used as the protection devices of power system. Nowadays, most of power companies adopted the $SF_6$ gas-type load break switch for increasing the reliability of distribution network by its superior durability against external environmental condition, in substitution for air-type and oil-type switches. But, it is important to establish the general estimation process for the testing and estimation for long-term reliability Accordingly, the national standard(RS C0031) was made for the reliability assessment of $SF_6$ gas load break switch and the testing facilities were also set in KERI(Korea Electrotechlology Research Institute). This paper presents the requirements of RS C0031 for reliability assessment of $SF_6$ gas load break switch and synopsis of the accelerated life testing facilities for $SF_6$ gas load break switch.

  • PDF

Program Development for Design and Part Load Performance Analysis of Single-Shaft Gas Turbines (단축가스터빈의 설계점 및 부분부하 성능해석 프로그램 개발)

  • Kim, Dong-Seop;No, Seung-Tak
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.20 no.7
    • /
    • pp.2409-2420
    • /
    • 1996
  • This paper describes the development of a general program for the design and part load performance analysis of single-shaft-heavy-duty gas turbines. Efforts are made to fully represent the real component features by the characteristic models and special emphasis is put on the modeling of cooled turbine stages. The design analysis routine is applied to simulate the performance of current gas turbines and its appropriateness for system analysis is validated. Meanwhile, the component parameters of real engines which describe the technology level are obtained. The program is extended to predicting the part load operation of gas turbines with the aid of models for the off-design characteristics of compressor, turbine and other main components. Part load simulation can be carried out only with limited numbers of input data. It is demonstrated that the program accurately estimates the part load characteristics of real turbines.

Performance Characteristics for Off-design Operation of Micro Gas Turbines (마이크로 가스터빈의 탈설계 운전 성능특성)

  • Kim, T.S.;Hwang, S.H.
    • The KSFM Journal of Fluid Machinery
    • /
    • v.7 no.3 s.24
    • /
    • pp.39-47
    • /
    • 2004
  • Micro gas turbines are designed with low turbine inlet temperature and pressure ratio. To overcome the efficiency defect of the simple cycle, adoption of the recuperator is an inevitable choice. In addition to the design performance, we should also pay attention to the off-design performance of gas turbines since they usually operate at part-load conditions lot a considerable amount of their lifetime. This study analyzes off-design performance characteristics of micro gas turbines and addresses the importance of the recuperation process doting the part load operation. Comparative analyses have been performed to evaluate the part load performance differences among various design and operating options : simple vs recuperative cycles, single vs two shaft configurations, various operating strategies for the single shaft configuration, and current vs advanced engines. Major finding is that maintaining high turbine exhaust temperature is crucial for efficient operation of micro gas turbines.

A Study on Full and Part Load Operations of a Biogas-fired Gas Turbine Combined Heat and Power System (바이오 가스를 사용하는 가스터빈 열병합 시스템의 전부하 및 부분부하 운전특성 해석)

  • Kang, Do-Won;Lee, Jong-Jun;Kim, Tong-Seop;Hur, Kwang-Beom
    • The KSFM Journal of Fluid Machinery
    • /
    • v.14 no.2
    • /
    • pp.35-40
    • /
    • 2011
  • This study analyzed the influence of firing biogas on the performance and operation of a gas turbine combined heat and power (CHP) system. A reference CHP system designed with natural gas fuel was set up and off-design simulation was made to investigate the impact of firing biogas in the system. Changes in critical operating parameters such as compressor surge margin and turbine blade temperature caused by firing biogas were examined, and a couple of operating schemes to mitigate their changes were simulated. Part load operation of the biogas-fired system was compared with that of natural-gas fired system, and it was found that as long as the two system produce the same electric power output, they exhibit nearly the same heat recovery.

Analysis of Relationship Between Design and Part Load Performance of Gas Turbines (가스터빈의 설계 성능과 부분부하 성능 사이의 상관관계 분석)

  • Kim, Dong-Seop
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.26 no.8
    • /
    • pp.1164-1171
    • /
    • 2002
  • This study analyzed the dependence of part load performance of simple cycle gas turbines on their design performance. Various parametric calculations were carried out to examine effects of design temperature ratio, pressure ratio and component efficiencies using a simplified analysis. In addition, a more practical analysis was done for realistic design conditions with the aid of a comprehensive performance analysis program. The results show that gas turbines with higher design performance exhibit less efficiency degradation during part load operation. The influence of power control method (fuel only centre) and air flow control) on part load performance was examined as well.