표제지
목차
Abstract 9
I. 서론 10
II. 송풍량 난조원인 분석 13
1. BF별 송풍량 Data 분석 14
1) 데이터 수집 14
2) 데이터 비교 15
2. 측정기 설치환경 조사 17
III. 유량 계측 시스템 고찰 19
1. 차압식 유량계 19
1) 유량계산 공식 20
2) Orifice 20
3) Flow Nozzle 22
3) Venturi tube 23
4) Annular Venturi Meter 24
5) 압력손실 27
2. 피토 튜브 29
1) 유량계산 30
2) 설치 및 유지관리 31
3. 열식 질량 유량계 32
1) 유량계산 33
2) 유량계의 설치 조건 34
4. 정류격자(straightner) 35
IV. 송풍량 난조방지 37
1. 평균유량 산출 37
2. 유체형상 개선 41
1) AVM 삽입위치 선정 41
2) AVM 설계 42
3) AVM의 안정성 검토 및 제작 43
4) AVM 적용결과 46
V. 결론 50
참고문헌 51
부록 52
Table 1. Measuring range of meter 14
Table 2. Data difference between blast furnace 16
Table 3. ASME advice item that apply to differential flow meter 17
Table 4. Straight pipe length of each BF's orifice 17
Table 5. Orifice Plate's thickness 21
Table 6. Pressre loss coefficient of straightener 35
Table 7. Quality of the material and special quality 43
Table 8. After AVM application 3BF Data comparisons 48
Fig. 1. Iron making process 11
Fig. 2. BF(Blast Furnace) flow press trend 13
Fig. 3. 3BF air flow rate data histogram 15
Fig. 4. 5BF air flow rate data histogram 15
Fig. 5. 3-5BF Xbar-s chart 16
Fig. 6. Circle Orifice plate 21
Fig. 7. D-2/D Tap setting diagram 22
Fig. 8. Flow nozzle 23
Fig. 9. Venturi tube 24
Fig. 10. Venturi tube's design standard 24
Fig. 11. AVM's basis form 25
Fig. 12. AVM's fluid shape change 26
Fig. 13. Perssure loss of differential flow meter 28
Fig. 14. Pitot tube 29
Fig. 15. Official use extent of pitot tube 31
Fig. 16. Thermal mass flow meter's detection principle 32
Fig. 17. Straight pipe that is needed to thermal mass flow meter 34
Fig. 18. Kind of straightener 36
Fig. 19. A thermal mass flow meter 37
Fig. 20. Flow Control Diagram 38
Fig. 21. Signal output of thermal mass flow meter 38
Fig. 22. Reaction rate of temperature sensor 39
Fig. 23. Reaction for drift of a current of sensor 40
Fig. 24. Straightener's insertion position 41
Fig. 25. AVM design 42
Fig. 26. AVM 3D View 43
Fig. 27. Stress distribution of AVM piping 44
Fig. 28. Stress distribution of AVM cone 45
Fig. 29. AVM cone 45
Fig. 30. 3BF Flow Trend 46
Fig. 31. After AVM application 3BFs' air flow rate Data histogram 47
Fig. 32. 3BF Xbar-s chart (Before - after AVM application) 48
Fig. 33. After AVM application air flow rate comparison by BF 49
Fig. 34. When there is elbow in same even establishment position of flow meter 52
Fig. 35. Flow meter establishment position of when two elbows are in same even 52
Fig. 36. Flow meter establishment position of when is in evens that two elbows differ 53
Fig. 37. When piping is shrunk or is expanded establishment position of flow meter 54
Fig. 38. Flow meter establishment position of when is valve 55