• Title/Summary/Keyword: Water Tube Boiler

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Failure Investigation of Fire-Side Water-Wall Tube Boiler

  • Fatah, M.C.;Agustiadi, D.;Pramono, A.W.
    • Corrosion Science and Technology
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    • v.20 no.5
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    • pp.242-248
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    • 2021
  • Unforeseen failures of boilers in power plants may affect the continuation of electricity generation. Main failures in boilers are influenced by the tube material, tube position, boiler service temperature and pressure, and chemical composition of the feed water and coal. This investigation was intended to find answers on the causes and mechanism of failure of the fire-side boiler water-wall tubes, due to perforation and corrosion. The tube conformed to the material requirements in terms of its chemical composition and hardness. Microscopic examination showed ferrite and pearlite indicating no changes in its microstructure due to the temperature variation. SEM test showed a single layer and homogenous film density particularly on the area far from perforation. However, layers of corrosion product were formed on the nearby perforation area. EDX showed that there were Na, Ca, S, and O elements on the failed surface. XRD indicated the presence of Fe2O3 oxide. The failure mechanism was identified as a result of significant localized wall thinning of the boiler water wall-tube due to oxidation.

Failure Analysis of Waterwall Tubes in Super Critical Boiler (초임계압 보일러 수냉벽 튜브의 파열사고 분석)

  • Kim, B.S.;Jung, N.G.;Kim, D.S.;Lee, S.H.
    • Journal of Power System Engineering
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    • v.7 no.1
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    • pp.20-24
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    • 2003
  • Boiler is one of the most important utilities providing steam to turbine in order to supply mechanical energy in thermal power plant. It is composed of thousands of tubes for high efficient heat transfer. Water is converted to steam inside the waterwall tubes. Many chemical components dissolved in boiler water come out of itself, deposit to the tube wall surface, prohibit heat transer, raise tube metal temperature, eventually fail the boiler tubes. Several tasks such as fracture surface study, tensile test, hardness test, metallurgical test, composition analysis of sticking elements were conducted to identify the root cause of tube failure.

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Application of Model Based Predictive Control with Kalman Filter to Natural Circulation Water Tube Boiler

  • Kim, Tae-Shin;Kwon, Oh-Kyu
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.1146-1151
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    • 2005
  • This paper deals with the control problem of a natural circulation water tube boiler with constraint conditions. Some linearized models for the water tube boiler are proposed around some operating points, and the model based predictive control law is adopted to control the plant accounting for constraints. In this controller, the Kalman filter is used for the state estimation, and the controller is designed based on the linearized model. The control performance of the designed controller is exemplified via some nonlinear simulations around the operation point, which show it works well.

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Basic Study on the IoT Micro Boiler (IoT 마이크로 보일러에 대한 기초 연구)

  • Jang, Sung-Cheol
    • Journal of Internet of Things and Convergence
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    • v.8 no.1
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    • pp.23-29
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    • 2022
  • The product to be developed in this study is a heat recovery device which generates steam or hot water at high temperature and high pressure by heating water using exhaust gas from diesel engine, gas engine, gas turbine, etc. as an exhaust gas boiler off heat boiler(EGB) type for ship and power generation. The steam vapor or the created warm water is used as the power source required for the steerage heating and hot water facility or the HFO heating of the ship, and the turbine drive. The principle of waste heat boilers serves to heat water as high temperature exhaust gas with heat pass through the tube of the boiler. The heated water is a structure that is sent to a cabin or turbine device in the form of steam. In this study, the objective of this study is to maximize the efficiency by increasing the heat transfer surface by replacing the tube which is the heat transfer part of EGB with the plate tube.

Optimum Design of Waste Heat Boiler with Water Tube and Three Drum (3드럼 수관식 폐열보일러의 최적설계)

  • Lee, Kwan-Jong;Han, Jin-Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.12
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    • pp.992-998
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    • 2006
  • This study is to optimize design parameters for waste heat recovery boiler with water tube and three drum. The design optimization considered here is to find the most economic dimension of the boiler considered which results in a minimum cost in producing a unit amount of steam per given period of operation. For this purpose, optimize design have to determine what are the main parameters of affecting the total cost of producing a unit amount of steam which is comprised of manufacturing cost of the boiler, operating cost of the fan etc.

Heat Transfer Characteristics of Heat Exchange Module for a Water Tube Type Modular Boiler (모듈형 수관식 보일러를 위한 열교환 모듈의 열전달 특성)

  • Ahn, Joon;Kim, Jong-Jin;Kang, Sae-Byul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.24 no.3
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    • pp.265-270
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    • 2012
  • A finned tube type heat exchange module has been proposed for a multi-burner water tube boiler. Fin density and length increase in streamwise direction to equalize the evaporation for each module, which makes it difficult to apply conventional bulk design procedure. The design program has been improved by updating data for every row of tubes along the flow. A numerical simulation has been also conducted to evaluate the effect of inlet conditions and validated with experiment. The heat transfer of the first row has been underpredicted by the conventional Zhukauskas correlation, since the acceleration of the flow due to the blockage is not fully inflected. The fin tip temperature is also underpredicted by Bessel solution, because of the interaction with neighboring fins.

Heat Transfer Module for Multi-Burner Water Tube Boiler: 0.5 t/h Class Model Simulation (다중버너 수관식 보일러를 위한 전열모듈의 열전달 특성: 0.5 t/h급 모형 수치해석)

  • Ahn, Joon;Kim, Jong-Jin;Kang, Sae-Byul
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.528-533
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    • 2007
  • A finned tube type heat transfer module has been proposed for a multi-burner water tube boiler. Fins change their geometry along the streamwise direction to maximize the performance, which makes it difficult to apply conventional bulk analysis. The design program has been improved by updating data for every row of tubes along the flow. A numerical simulation has been also performed to evaluate the effect of inlet conditions and validated with experiment. The heat transfer of the first row has been underpredicted by the conventional Zhukauskas correlation, where the acceleration of the flow due to the blockage is not fully inflected. The fin tip temperature is also underpredicted by Bessel solution, because of the interaction with neighboring fins.

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Simulation of Remote Field Scanner for Defect Evaluation of Water Wall Tube Within the Fluidized Bed Boiler (유동층보일러 수냉벽튜브 결함평가를 위한 원격자장 스캐너 시뮬레이션에 관한 연구)

  • Gil, Doo-Song;Jung, Gye-Jo;Seo, Jung-Seok;Kim, Hak-Joon;Kwon, Chan-Wool
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.2
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    • pp.145-150
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    • 2020
  • Water wall tube is one of the major factors consisting of a fluidized bed boiler and it plays very important role for the generation of electricity within the boiler. But these water wall tubes within the fluidized bed boiler are subject to the ware and corrosion caused by the high temperature gas and the flowing medium. If water leak is occurred, the secondary damage by the water leak will occur. As a result of that, the power generation efficiency decreases noticeably. Therefore, the maintenance of the water wall tube is very important. In this study, we designed a exciter sensor based on simulation and composed a remote field eddy current system for the defect evaluation of the outer water wall tube. Starting from the shape design of exciter, we conducted simulations for various design factors such as the water wall tube size, material, frequency, lift-off and so on. Based on the results, we designed the optimum exciter sensor for the water wall tube test within the fluidized bed boiler.

HEAT TRANSFER ON THE COMBUSTION CHAMBER OF A WATER TUBE TYPE BOILER WITH MULTIPLE BURNERS (다중 버너를 채택한 수관식 산업용 보일러 연소실의 열전달 특성)

  • Ahn, J.;Hwang, S.;Kim, J.J.;Kang, S.B.
    • 한국전산유체공학회:학술대회논문집
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    • 2009.04a
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    • pp.335-340
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    • 2009
  • Operating medium or large scale industrial boilers in partial load condition, the burner should undergo the off-design points resulting in poor exhaust gas characteristics. To obtain the stable turn down performance, two or more burners can be used for the industrial boiler. In case multiple burners are adopted, the heat transfer can be enhanced by arranging the burners properly. In the present study, numerical simulations have been conducted for the combustion chamber of a 2 t/h class industrial boiler in order to clarify the heat transfer characteristics at the combustion chamber.

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HEAT TRANSFER ON THE COMBUSTION CHAMBER OF A WATER TUBE TYPE BOILER WITH MULTIPLE BURNERS (다중 버너를 채택한 수관식 산업용 보일러 연소실의 열전달 특성)

  • Ahn, J.;Hwang, S.;Kim, J.J.;Kang, S.B.
    • Journal of computational fluids engineering
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    • v.14 no.2
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    • pp.77-83
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    • 2009
  • Operating medium or large scale industrial boilers in partial load condition, the burner should undergo the off-design points resulting in poor exhaust gas characteristics. To obtain the stable turn down performance, two or more burners can be used for the industrial boiler. In case multiple burners are adopted, the heat transfer can be enhanced by arranging the burners properly. In the present study, numerical simulations have been conducted for the combustion chamber of a 2 t/h class industrial boiler in order to clarify the heat transfer characteristics at the combustion chamber.