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황규홍,김종강,조명제,최정림,박정권 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-
To improve the mechanical and chemical properties of unfired A12O3-C refractories, which is widely used in metal line of steel-making ladle, MgO was added as a matrix powders and the degree of spinel formation was studied, Because the spinel was formed at the contact areas between A12O3 and MgO particles and the volume of in-situ formed spinel increased more abnormally at the side of A12O3 particles than MgO, A12O3 aggregates was more recommendable than MgO aggregates. So to compare the degree of spinel formation in the A12O3-MgO-C(AMC) refractories, two kinds of A12O3 aggregates was added in different content ratio and their effects on physical properties such as permanent volume expansion were examined. For A12O3 aggregates, low purity fused A12O3 (BFA) was more preferable than the high purity fused A12O3 (WFA) due to high density and the high degree of spinel formation. And corrosion resistance was increased with the amount of MgO added, and the finer the MgO powder, the better the residual expansion and minute structure formation was observed. But in case of a sudden increasement of spinel phase air gap would be appeared around aggregates and resulting crack showed deteriorative effect in anti-corrosion, so the appropriate quantity of MgO and it's grain size could be controlled for optimal residual expansion due to spinel formation and advancement of corrosion resistance by structural stability.
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보령화력발전소 7ㆍ8호기 순환수 취수에 대한 수리 및 수치모형실험
이용곤(Yi Yong-Kon),정상화(Cheong Sang Hwa),김창완(Kim Chang Wan),김종강(Kim Jong Gang) 대한토목학회 2006 대한토목학회논문집 B Vol.26 No.5B
본 연구에서는 화력발전소 순환수취수로의 유량증가가 취수펌프장 흐름에 미치는 영향을 해석하고 개선하기 위하여 수리 및 수치모형실험을 수행하였다. 수치모형실험결과에 의하면 화력발전소 순환수취수로의 유량이 증가하면 취수로내의 유속과 순환수취수 펌프장의 연직방향와도가 증가하여 순환수취수 펌프장내의 와류발생가능성이 크게 증가하는 것을 알 수 있었다. 수리모형실험을 수행하여 순환수취수펌프장 유입부의 수면 근처 흐름은 거의 균등한 유량 배분이 이루어지고 반면에, 바닥 근처의 흐름은 유량 배분이 균등하게 이루어지지 못하여 취수펌프장내에서 역류현상이 발생하는 것을 밝혀냈다. 삼각형 도류벽을 취수펌프장 유입부에 설치하여 유속분포의 불균일성을 제거할 수 있었고 역류발생문제를 제거하였다. In this study, hydraulic and numerical model experiments were performed to analyze and improve the effects of flow-rate increase in the intake canal of Boryeong Thermal Power Plants on the flow condition in the circulation water pump (CWP) chambers. Based on the numerical simulation results, when the flow-rate increased in the circulation water intake canal, the velocity in the canal and vertical vorticities in the circulation water pump chambers increased and hence the vortex occurrence potential would be greatly increased. It was found by performing hydraulic model experiments that the velocity distribution near the bottom in the inlet of the circulation water pump chambers was highly non-uniform while the velocity distribution near th1e water surface was nearly uniform. To reduce the non-uniformity in the velocity distribution, triangular flow deflectors were devised, The installation of the flow deflectors in the inlet of circulation water pump chambers was successfully to reduce velocity non-uniformities and to remove flow reversal problems.
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