• 제목/요약/키워드: Steam temperature control

검색결과 155건 처리시간 0.03초

발전용 보일러 주증기 튜브 과열방지용 오리피스 설계기법 (The design method of overheat protection orifice for power plant boiler super heated tube)

  • 김범신;유성연;하정수;김의현
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2003년도 추계학술대회
    • /
    • pp.373-378
    • /
    • 2003
  • It is important that overheat protection of super heated tube in boiler operation and maintenance. The overheat of super heat tube can make damage and rupture of tube material, which causes accidental shutdown of boiler. The super heated tube overheat is almost due to the lack of uniformity of gas temperature distribution. There are two ways to protect overheat of super heated tube. The one is to control hot gas operation pattern which is temperature or flow distribution. the other is to control super heated steam flow distribution. The former is difficult than the later, because of control device design. In this paper steam flow control method which uses orifices is proposed to protect overheat of super heat tube.

  • PDF

Intelligent Control of Power Plant Using Immune Algorithm Based Multiobjective Fuzzy Optimization

  • Kim, Dong-Hwa
    • 한국지능시스템학회:학술대회논문집
    • /
    • 한국퍼지및지능시스템학회 2003년도 ISIS 2003
    • /
    • pp.525-530
    • /
    • 2003
  • This paper focuses on design of nonlinear power plant controller using immune based multiobjective fuzzy approach. The thermal power plant is typically regulated by the fuel flow rate, the spray flow rate, and the gas recirculation flow rate. However, Strictly maintaining the steam temperature can be difficult due to heating value variation to the fuel source, time delay changes in the main steam temperature. the change of the dynamic characteristics in the steam-turbine system. Up to the present time, PID Controller has been used to operate this system. However, it is very difficult to achieve an optimal PID gain with no experience, since the gain of the PID controller has to be manually tuned by trial and error. These parameters tuned by multiobjective based on immune network algorithms could be used for the tuning of nonlinear power plant.

  • PDF

1kW 연료전지 시스템용 개질기 온도제어 (Temperature Control for the Steam Reforming Reactor in 1kW PEMFC system)

  • 신범수;김동찬;공민석;최동민;박연구
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2008년도 추계학술대회B
    • /
    • pp.3136-3139
    • /
    • 2008
  • The object of the paper is to design two PI controllers. One provides the stable target temperature to the steam reforming reactor in 1kW PEMFC system. The other controls burner to operate within a permissible range of temperature. Feedforward control is applied to obtain temperature stability against disturbances such as changes of operating condition resulted from load change. Step response tests show that these controller work well with an error tolerance of $5^{\circ}C$.

  • PDF

Immune Based Intelligent Tuning of the 2-DOF PID Controller for Thermal Power Plant

  • Kim, Dong-Hwa
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2002년도 ICCAS
    • /
    • pp.101.3-101
    • /
    • 2002
  • Contents 1 Abstract- In the thermal power plant, there are six manipulated variables; main steam flow, feedwater flow, air flow, spray flow, fuel flow, and gas recirculation flow. Therefore, the thermal power plant control system is a multi-input and output system. In the control system, the main steam temperature typically is regulated by the fuel flow rate and the spray flow rate, and the reheater steam temperature is regulated by the gas recirculation flow rate. Up to the present time, the PID controller has been used to operate this system. This paper focuses on the characteristic comparison of the PID controller, the modified 2-DOF PID Controller on the DCS, in order to design an optimal...

  • PDF

6시그마 기법을 적용한 원자력 터빈 시뮬레이터의 발전기 출력 연산오차 저감 (The Reduction of Generator Output Calculation by Using 6σ Method on Steam Turbine Simulator in a Nuclear Power Plant)

  • 최인규;김종안;박두용;우주희;신만수
    • 전기학회논문지
    • /
    • 제60권5호
    • /
    • pp.1017-1022
    • /
    • 2011
  • This paper describes the improvement of the calculation by using $6{\sigma}$ method on steam turbine simulator in a nuclear power plant. The simulator is essential to not only verification and validation of control logic but also making sure of control constants in upgrading the long time used control system into the new one. And the dynamic model is a key point in that simulator. The model used during the retrofit period of the turbine controller in Kori Nuclear Power Plant makes difference in calculating generator output and control valve positions. That is because such operating data as the main steam pressure, the main steam temperature and control valve positions of Yongkwang #3 are different from those of Kori #4. Therefore, the model parameters must be tuned by using actual operating data for the high fidelity of simulator in calculating the dynamic characteristic of the model. This paper describes that the $6{\sigma}$ method is used in improvement of precision of generator output calculation in the steam turbine model of the simulator.

Thermodynamic model of one of the super heaters and the related spray in the Nekka power plant and Presenting SCO method to control boiler temperature

  • Zalloi, Mehdi;Barghandan, Saeed;Badamchizadeh, M.A.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2005년도 ICCAS
    • /
    • pp.129-133
    • /
    • 2005
  • In this paper, first the thermodynamic model is presented to one of the super heaters and sprays of the Nekka power plant and then its unknown parameters are identified according to the registered data of the power plant. SCO control method is introduced to control the external steam temperature of super heater. Finally the conventional method in power plant for controlling external steam temperature of super heater is compared with new method and their performances are presented..

  • PDF

증기터빈 밸브제어방식에 따른 과속도 제어 고찰 (A Study on Overspeed Control and Valve Position Control for Steam Turbine in Power Plants)

  • 최인규;우주희
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2008년도 제39회 하계학술대회
    • /
    • pp.1661-1662
    • /
    • 2008
  • After steam turbines in power plant drives generator and maintains it at rated speed using high temperature and high pressure steam energy, they regulate the output of generator when synchronized in parallel with the power system. By the way, as the steam flow into turbine can not be reduced fast even though the electrical load is lost, the turbine gets into dangerous situation due to the increase of its speed. At this time, the duty of the turbine governor is "how to limit the speed within its overspeed trip setpoint and escape from danger." In order to implement this purpose, there are various ways different from valve position control. So, in this paper, the various methods for overspeed protection are introduced in comparison with valve position control.

  • PDF

PLC를 이용한 대열 스팀보일러의 원격 제어에 관한 연구 (A Study on the Implementation of PLC Program for Once-through Type Steam Boiler Control)

  • 조현섭;민진경;장성환
    • 한국산학기술학회:학술대회논문집
    • /
    • 한국산학기술학회 2006년도 춘계학술발표논문집
    • /
    • pp.327-329
    • /
    • 2006
  • In this paper, PLC program for flowing type steam boiler control is presented. The function of the implementation are flowing type steam boiler, PLC control, interpretation of PLC command, and temperature scheme. The flowing type steam boiler approach is based on master-slave control concept. To show validity of the developed PLC program, severial experiments are illustrated.

  • PDF

톱밥 촤의 고온 수증기 가스화 특성 (Steam Gasification Kinetics of Sawdust Char at High Temperature)

  • 노선아;윤진한;길상인;민태진;이정규
    • Korean Chemical Engineering Research
    • /
    • 제52권6호
    • /
    • pp.821-825
    • /
    • 2014
  • 바이오매스의 수증기 가스화 특성을 고온 영역에서 살펴보고자 열중량 분석기(thermobalance)에서 톱밥 촤의 수증기 가스화 연구를 수행하였다. 반응 온도를 $850^{\circ}C$에서 $1400^{\circ}C$까지 수증기 분압을 0.3, 0.5, 0.7 atm으로 변화시키며 가스화 실험이 수행되었다. 반응 kinetics 해석은 기체-고체 화학반응의 세 가지 모델이 이용되었고 이 중 modified volumetric model이 중량 변화를 가장 잘 나타내었다. 가스화 온도 $900^{\circ}C$를 기준으로 diffusion control regime과 reaction control regime의 두 단계로 가스화가 구분되었으며 이때 각각의 regime에 대하여 활성화에너지와 빈도인자를 도출하고 수증기 분압의 영향을 살펴보았다. 가스화와 동시에 수성가스화 변환반응이 진행되어 생성기체의 $H_2$ 농도가 CO에 비하여 2배 정도 높은 값을 나타내었다.

스프레이와 댐퍼를 이용한 관류 보일러 스팀 온도의 (2X2) 동역학 행렬 제어에 관한 연구 (A Study on Dynamic Matrix Control using Spray and Damper to Once-through Boiler Steam Temperature)

  • 김우헌;문운철
    • 조명전기설비학회논문지
    • /
    • 제24권1호
    • /
    • pp.91-97
    • /
    • 2010
  • 동역학 행렬 제어(Dynamic Matrix Control) 기법은 각종 산업 현장에서 가장 활발하게 적용되고 있는 고급 제어 기법으로, 최근에는 공정제어의 표준 기법으로 인식되고 있다. 일반적으로 동역학 행렬 제어에서는 대상 플랜트의 거동을 묘사하기 위하여 계단 응답 모델을 이용한다. 본 논문에서는 화력발전의 관류 보일러-터빈 시스템에 동역학 행렬 제어 기법을 적용한 결과를 제시한다. 먼저 제어를 위해 두 개의 입력변수로 스프레이와 댐퍼를 선정한 후, 두 개의 주요 출력 변수에 대한 계단 응답 모델을 생성하였다. 그 후, 생성된 2 입력 - 2 출력 계단 응답 모델을 바탕으로 한, 동역학 행렬 제어의 최적화 계산을 통해 매 순간 보일러 스팀 온도를 제어하는 구조의 제어기를 설계하였다. 제시된 제어기를 두산(주)의 보일러 시뮬레이션 모델인 APESS에 적용한 결과 만족할 만한 제어 성능을 나타냄을 확인하였다.