• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 C
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• pp.1276-1278
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• 1999

This paper proposed the optimal operational scheduling of cogeneration system for paper mill connected with several auxiliary devices. Auxiliary devices that include auxiliary boiler, waste boiler and sludge incinerator operate with multi-cogeneration system. Especially environment element was considered in objective function to solve environment problem. Electricity can be purchased through power system from utility. The proposed operational strategy on cogeneration system for paper mill to increase energy efficiency can be applied to the similar cogeneration system in industrial field.

• 한국산학기술학회논문지
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• 제15권3호
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• pp.1681-1684
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• 2014

본 논문에서는 석탄화력 발전소의 보일러에서 통풍계통의 맥동을 실시간으로 측정할 수 있는 장치에 관한 것이다. 500MW급 대용량 보일러 통풍계통의 맥동 감시장치는 팬 이상 발생시 팬을 보호하기 위하여 정지시키는 기능을 한다. 그러나 맥동 감시 장치의 빈번한 고장으로 신뢰성이 저하되고 운전에 영향을 미치므로 이것을 DCS(Distributed Control System) 로직으로 구성하여 신뢰성을 향상시켰다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.1025-1030
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• 2008

We develop heat exchanger modules for a multi-burner boiler. The heat exchanger module is kind of a heat recovery steam generator (HRSG). This heat recovery system has 4 heat exchanger modules. The 1st module consists of 27 bare tubes due to high temperature exhaust gas and the others consist of 27 finned tubes. The maximum steam pressure of each module is 10 bar and tested steam pressure is 4 bar. In order to test these heat exchanger modules, we make a 0.5t/h flue tube boiler (LNG, $40\;Nm^3/h$). The test results of 100% boiler load show that heat transfer rate of 1st module is 49.7 Mcal/h which is 34% of total heat transfer rate and that of 2nd module is 82.6 Mcal/h which is 57% of total heat transfer rate. The reason of higher the heat transfer rate of 2nd module than that of 1st module is that the 2nd heat exchanger module has finned tubes instead of bare tube. The boiler load 50% results show that only 2 heat exchanger modules are needed to extract the heat from the flue gas to water. From this result, it is very important of optimum design of the first finned tube among all water tubes.

• 한국위험물학회지
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• 제6권2호
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• pp.77-86
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• 2018

Interest in renewable energy is increasing for eco-friendly use of energy, and fuel cells are being used in various ways such as houses and buildings as power generation methods that have low emissions such as $NO_X$ and $CO_2$. As the supply of fuel cells expands, more and more boilers are installed in the existing buildings, but safety management is not being performed properly. Therefore, in this study, a prior study was conducted on the status of fuel cell-boiler complex installation and related criteria, and the risk factors were analyzed according to the installation environment and structure. Based on these standards, the safety performance of the fuel cell-boiler combined installation is assessed by conducting a demonstration using the starting product of the simulated operation to derive the installation criteria (proposal) for the fuel cell-boiler combined installation. The installation criteria (proposal) include the construction and connection method of the piping according to the fuel cell-boiler complex installation.

• 한국소음진동공학회논문집
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• 제23권5호
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• pp.385-393
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• 2013

In this paper, the mechanism identification and the avoidance measures on the phenomena of transient acoustic vibration amplified at the water-supply piping system to regulate the steam temperature of the boiler reheater in 500MW class supercritical power plant are presented. The pressure pulsation waves induced by the impeller passing of two feed-water pumps with five blades are coincident with the local acoustic modes of boiler reheater water-supply piping system. There are the phenomena amplified at the peaks of 5X, 10X, 15X and 20X in spectrums of piping vibration, sound pressure, and the feed-water's pressure pulsation waves. The shut-off device is installed in the piping system for the interception of pressure pulsation waves transmitted from two feed-water pumps and the modified design change of the piping layout is applied for the acoustic resonance avoidance. The acoustic natural frequencies are separated from the harmonics of pressure pulsation waves induced by the pump impellers passing through the design change of the span length. The acoustic vibration is gone by resonance avoidance measures. As a result, more than 20 dBA reduction is achieved from 100 dBA to 80 dBA.

• 한국시뮬레이션학회논문지
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• 제29권3호
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• pp.9-18
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• 2020

대규모 화력 발전소 제어용 시뮬레이터 개발은 급수/증기 계통, 공기/연소가스 계통, 미분탄 계통 및 터빈/발전기 계통으로 구성되며, 기계적인 터빈/발전기를 제외하고 모든 계통에 대하여 모델링이 가능하다. 현재까지 화력발전의 일부 계통에 대한 신경망 시뮬레이터 개발에 대한 시도는 있었으나 전체 계통에 대한 시뮬레이터 개발은 완성된 적이 없다. 특히 모든 발전사의 핵심 기술 개발중 하나인 오토튜닝은 정확도가 높은 모든 계통에 대한 모델링이 완성되어야 이룰 수 있는 기술이다. 이에 본 논문은 신경망 알고리즘을 이용하여 시스템을 설계할 경우 가장 핵심인 입출력 관계에 대한 변수를 모든 계통에 대하여 정의하였다. 시뮬레이션을 수행한 결과 실제 보일러 계통의 95~99% 이상 정확도를 보임에 따라 본 시뮬레이터에 현장 PID 제어기를 결합할 경우 고장진단이나 오토튜닝에 활용 가능할 것이다.

• 전기전자학회논문지
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• 제26권3호
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• pp.349-354
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• 2022

화력발전소의 보일러 모델은 로직도 작성, 플랜트 튜닝, 제어이론 적용 등 다양한 분야에 사용된다. 특히 정확한 제어를 위해서는 정확한 모델이 필요하다. 수학적 모델은 화력발전소 시스템의 비선형성, 복잡성, 시변특성 등으로 인하여 시스템을 정확하게 표현하는데 한계가 있다. 이런 시스템에 대하여 신경망을 이용한 모델링 방법은 좋은 대안이 될 수 있다. 본 논문에서는 화력발전소 보일러의 증기계통을 신경망 알고리즘의 한 종류인 GRNN을 이용하여 모델링하였다. 보일러의 과열기와 재열기, 과열저감기, 드럼을 모델링하여 540[MW]급 화력발전소에서 취득한 데이터를 이용하여 학습하고 검증하였다. 검증결과 제안한 모델의 출력이 보일러의 실제 출력과 잘 일치함을 알 수 있었다.

• Journal of Advanced Marine Engineering and Technology
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• 제26권3호
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• pp.382-388
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• 2002

Dissolved silica is one of fatal components at a boiler facility Therefore, a dissolved silica measurement system should be equipped for managing efficiently the boiler facility. Most of silica measurement systems are composed of a sensor module of single-beam type structure, and silica density is measured with a infrared spectrometry using the Lambert-beer method. However, such a system occurs measuring error of large range and inconsistency of a light source, because of measuring a standard sample and a measuring sample alternatively. This paper introduces a method that the sensor module has a split-beam type structure and a tungsten lamp. The proposed system can measure silica density quickly and precisely more than those composing of a single-beam type structure, because of measuring and comparing with two samples at a same time. And examination results are shown to compare efficiencies of the system and existing commercial products, and for an ammonia influence.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.744-748
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• 1989

A newly developed Expert System (ES) for the tuning of thermal power plant control equipment is described. The system is furnished with the rules for controller tuning which were obtained by analysis and arranging the data and knowledge from the experts or tuning records. Based on these rules, automatic tuning or setting of the control parameters is performed in real-time base. The performance of the test equipment, a combination of ES and a boiler simulator, was examined in the automatic tuning test for steam pressure, steam temperature, and load controllers of a constant-pressure once-through boiler model. It was confirmed from the test results that the system is quite promising for future application to actual plants, since the tuning results obtained by the proposed system were similar to those by tuning experts.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 기술교육전문연구회
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• pp.132-135
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• 2003

The use of the midnight power faces the crisis of the load peak-cut problem. Which appears at the simultaneous start of the midnight power system. We suggest a control method which uses the characteristics of boiler system. The system used that method consists of 6 heaters and are designed for the load distribution on each heater. Proposed method can take the balance of load during full time of midnight power supplied. The system is composed of measurement part and heater controller. Taking the data of the experience as a reason, the algorithm make the midnight power distribute. Experimental results show the validity of the method and the system proposed.