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머신 러닝을 이용한 중유 화력 열병합 발전소 보일러의 고장 예지
강새별(Sae Byul Kang),이현희(Hyun Hee Lee),오정석(Jeong Seog Oh),최규성(Kyu Sung Choi) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.5
중유를 연료로 사용하고 있는 150t/h급 발전용 보일러에서 1) 주증기 과열로 인한 디슈퍼히터 스팀 사용량 증가, 2) 공기예열기 차압이 증가하는 문제가 발생하였다. 주증기 과열이 되어 디슈퍼히터 스팀이 증가하는 원인으로는 보일러 연소기 연소실에 슬래깅(또는 파울링)이 발생하여 보일러 주 전열면에 충분한 열전달이 되지 않아 슈퍼히터로 고온의 연소가스가 전달되어 문제가 발생한 것으로 추정된다. 이러한 문제 원인을 추정하기 위해 사용된 연료, 운전 데이터를 분석하였다. 또한 향후에 유사한 문제가 발생하였을 때 문제 진행 중 문제 발생을 파악할 수 있도록 고장 예지 방법을 도출하였다. 마할라 노비스 거리를 이용한 고장 예지 방법을 사용하였을 때 문제 발생 초기(약 5일 이내)에 고장이 발생하고 있다는 것을 감지할 수 있었다. An increase in the use of desuperheater steam due to the overheating of the main steam and increment of the differential pressure of the air preheater occur in a 150t/h class boiler that uses heavy oil as fuel. When the main steam overheats, the desuperheater steam increases, and slagging or fouling occurs in the combustion chamber of the boiler combustor. In this study, the fuel and operating data were used to determine the cause of the problem. In addition, a failure prediction method was derived to identify the problem in case a similar problem occurs in the future. It was possible to detect the failure occurrence within 5 days using the failure prediction method.
멀티버너 보일러용 핀 튜브 열교환기 모듈 - 열설계 프로그램 개발
강새별(Sae Byul Kang),김종진(Jong Jin Kim),안준(Joon Ahn) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
We develop a 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 8 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 1 ㎫ and tested steam pressure is 0.7 MPa. In order to test these heat exchanger modules, we make a 0.5 t/h flue tube boiler (LNG, 40 N㎥/h). We tested the heat exchanger module with changing the position of each heat exchanger module. We measured the inlet and outlet temperature of each heat exchanger module and calculated the heat exchange rate. Based on test results, we develop a heat transfer calculation program to predict flue gas. Calculation results show that temperature and temperature difference between measured and calculated flue gas exit temperature is less than 20 ℃ when flue gas inlet temperature is 620 ℃.
강새별(Sae Byul Kang),정영종(Youn Jong Chung),이은현(Eun Hyun Lee),윤금중(Gum Jung Yoon) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
We developed a diesel engine cylinder test facility to carry out fatigue lest of engine head by controlling hydraulic pulsating pressure up to 100 Hz. Using a high-pressure pump up to 30 MPa, high pressure servo valves and pressure sensors, a cylinder head fatigue can be performed. This engine head facility can perform a head fatigue lest by 6 times faster than a normal engine durability test whose test time takes usually more than one month. We tested 3 different types of diesel engine heads developed by HMC. The results of fatigue tests show absolutely identical cracks occurred by the engine durability test. By using this diesel engine head fatigue test facility, we can find the fatigue crack positions of newly developed engine cylinder head, shorten developing time of engine cylinder head and design a robust engine cylinder head.
0.5 ton/h급 무연소실 관군 연소 산업용 보일러 개발
강새별(Sae Byul Kang),김종진(Jong Jin Kim),기호충(Ho Choong Ki) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
We develop a 0.5 ton/h class non-furnace type industrial boiler. The first non-furnace type boiler was developed and currently is sold from Japan. However, there have been no researches of non-furnace type boiler in Korea. Currently developed non-furnace type industrial boiler has water tubes in a combustion chamber to reduce the boiler size and concentration of NOx. The size of newly developed boiler is about 50% of currently sold commercial fire tube boilers and 120% of the non furnace type boiler which developed in Japan. In order to increase the efficiency of the boiler, an air preheter is placed at the rear of combustion chamber. A fin-tube type heat exchanger and a plate type heat exchanger are adopted to recover thermal energy of the combustion gas. The performance of the newly developed boiler is measured according to Korea Standards regulation (KSB 6205). The rated amount of evaporation is up to 630 kg/h and maximum vapor pressure is 1.0 ㎫ (operation pressure : 0.5~0.8 ㎫). The efficiency based on high heating value is 92% at 80% of boiler load. The concentration of CO is 73 PPM at 100% boiler load and NOx emission is less than 40 PPM.
강새별(Sae Byul Kang),김종진(Jong Jin Kim),안준(Joon Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
We develop a 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 1 ㎫ and tested steam pressure is 0.7 ㎫. In order to test these heat exchanger modules, we make a 0.5t/h flue tube boiler (LNG, 40 Nm3/h). We tested the heat exchanger module with changing the position of each heat exchanger module. We measured the inlet and outlet temperature of each heat exchanger module and calculated the heat exchange rate. The results show that if module C is placed at second stage (the 1st stage is always module O, bare tube module), there is no need to attach an additional heat exchanger module. In this case the exit temperature of module C is low enough to enter an economizer which is more effective in heat recovery than a heat exchanger module.
강새별(Kang, Sae-Byul),김종진(Kim, Jong-Jin),최규성(Choi, Kyu-Sung),이웅진(Lee, Woong-Jin) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
We measured the efficiency and flue gas concentration of a 90kW woodchip boiler which is for heating water of lodging. At nominal operating condition, the fuel, woodchip is fed into the boiler at a rate of 22.6 kg/h. In order to determine the efficiency of the boiler, we measured the water flow rate, woodchip flow rate, heating value and water content of woodchip, temperature of inlet and outlet of heating water. The results of test show that the power output of the woodchip boiler is 90.0 kW(77,400 kcal/h) and the thermal efficiency of the boiler is 88.5%. By using a gas analyser, flue gas concentrations are measured. The results show that O2 in the flue gas is 10.2%, CO concentration is 393 ppm and NOx concentration is 74 ppm.