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국내 무연탄용 순환유동층 Boiler의 Clinker생성에 관한 연구
전문택,김진호,김경남 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.1
The analysis of anthracite coal as fired basis and clinkers located on combustor, seal pot and cyclone to find out the reason why the bed materials agglomerated and resulted in clinkers were studied. It was one of the most serious problem in early period operating the Tonghae CFBC(Circulating Fluidized Bed Combustor). The proximate analysis, heat value analysis, ash fusion temperature analysis and size distribution analysis of coal & ash were studied using TGA, Bomb Calorimeter, Ash Fusibility Determination and Sieve Shaker. The chemical compositions and microstructure of raw material and clinker located on combustor, seal pot and cyclone were investigated by the scanning electron microscope(SEM) with an energy dispersive X-ray spectrometer(EDS), ICP-AES, X-ray diffractometer(XRD). The domestic anthracite coal had much fine size portion which could cause after burning. Furthermore domestic coal had higher ignition temperature and lower volatile matter portion than bituminous coal, which finally ended in low combustion velocity. So it is fundamental to lengthen the furnace residence time to reach complete combustion. And it is possible to use auxiliary fuel but its dependence is low for CFBS because combustion temperature is at around 800~850℃, which range is very lower than general fine size coal combustion type. Fine size coal could do after burning, so it could cause temperature rising at combustor upper region and clinker formation by means of fouling. The short residence time of fine size coal in furnace can bring out high content of unburned carbon in fly ash, so it is necessary to reduce the fine size coal content. Assembling the result of chemical composition analysis, crystal structure analysis and EDS analysis of clinker, we could conclude that calcium in limestone and iron in bed material did the main effect in agglomeration.
A Rationalized Firing Controller For Cycloconverter Drive
Chung, Yon Tack,Seo, Young Soo,Sung, Dae Yung,Cho, Mun Tack 명지대학교 대학원 1989 明知大學校開校四十周年記念論文集 Vol.1989 No.-
1950년대 이후 사이크로 컨버터 제어 회로는 마이크로 프로세서의 장점을 가진 트랜지스터와 IC로 구성됨에 따라 더욱 논리적이고, 계산력이 강력하고 소형화되면서 값이 싼 것으로 대치되고 있다. 이 논문은 트리거링 펄스를 발생하는 아날로그와 디지탈을 포함하여 VVVF 사이크로 컨버터의 제어 점호기를 구성했다. VVVF형 비순환 전류 사이크로 컨버터의 응용은 이러한 결합 방법을 사용한 제어이다. 그 결과 제안된 방법은 실 시간에서 트리거링 펄스가 안정함을 보여준다.
A RATIONALIZED FIRING CONTROLLER FOR CYCROCONVERTER DRIVE
Dae-Yong Seong,Mun-Tack Cho,Young-Soo Seo,Yon-Tack Chung 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
Since 1950's, A Cycloconverter control circuits have been desinged with transistor, int-ergrated circuited with the advantage of microprocessors, more logical and computational power became available in much less space and cost.<br/> This paper describes of firing controller for VVVF cycloconverter drives has been studied using a combination of analog and digital method in which triggering pulse gereration.<br/> As an application, A VVVF type noncircuilatinq current cycroconverter is controlled using this combination method.<br/> The results shown that proposed method is stable and triggering pulse production at real time.<br/>