표제지
요약문
Abstract
목차
기호 설명 10
제1장 서론 15
1.1. 연구 배경 15
1.2. 연구 동향 16
1.3. 연구 목적 17
제2장 보일러의 효율 및 공해 성능 예측법 18
2.1. 열효율 예측법 18
2.1.1. 대상 시스템 및 총괄반응식 18
2.1.2. 운전조건 21
2.1.3. 열물성치 계산법 24
2.1.4. 효율 27
2.2. NOx 및 CO 배출농도 예측법[이미지참조] 28
2.2.1. 단순 모델 연소실 및 지배방정식 28
2.2.2. 해석모델의 신뢰성 32
제3장 H₂ 혼소율에 따른 결과 및 고찰 36
3.1. 일반 보일러(Ba-B)의 H₂ 혼소율에 따른 성능 변화 38
3.2. 가습 H₂ 보일러 유용성 검토 45
제4장 물 분사 폐열회수 보일러의 효용성 검증 50
4.1. 최적 조건의 물 분사 폐열회수 보일러 시스템 50
4.1.1. NG, H₂ 보일러의 폐·예열원 분석 53
4.1.2. NG, H₂에 대한 HR-B/WS의 폐·예열원 분석 57
4.2. 물 분사 폐열회수 보일러 기초 실험 59
4.2.1. 연구대상 시스템 59
4.2.2. 해석방법 61
4.2.3. 기초 시험(1차) 결과 분석 65
4.3. 물 분사 폐열회수 보일러의 상용화 검토 69
4.3.1. 고효율을 위한 설계 사양 개선 69
4.3.2. 재실험(2차) 결과 분석 71
4.3.3. 공해물질 배출량 비교 78
제5장 결론 80
참고문헌 81
Table 2-1. Operating conditions for the constant and variable parameters of the NG-H₂ boilers 22
Table 2-2. NG component analysis 23
Table 2-3. Curvefit coefficients for thermodynamic properties 26
Table 2-4. The calculation of the Planck mean absorption coefficients of the emitting species 31
Table 3-1. Information on input and output flow rates for 24kW domestic boilers with the kind of fuels 37
Table 4-1. Inlet and outlet basic experimental information for Ba-B and HR-B/WS with the return water temperature 66
Table 4-2. Inlet and outlet temperature information of HR-B/WS with return temperature after changing the experimental conditions 72
Fig. 2-1. Schematic diagrams of the vapor humidified boiler. Vapor heat exchanger is inserted between the sensible and condensing heat exchangers of the basic boiler 19
Fig. 2-2. One-dimensional model combustor to simulate real combustion chamber 30
Fig. 2-3. Species and temperature profile in one-dimensional model combustor 33
Fig. 2-4. Comparison of NOx and CO emission concentrations between real boiler combustor and one-D model combustor[이미지참조] 35
Fig. 3-1. Adiabatic flame temperature with respect to air ratio for the NG-H₂ boilers 39
Fig. 3-2. NOx and CO emission concentration obtained by one-D model analysis for the NG-H₂ boilers[이미지참조] 41
Fig. 3-3. Thermal efficiency with respect to boiler outlet temperature for the NG-H₂ boilers 43
Fig. 3-4. Heat and mass analysis of the wasted heats at boiler outlet temperature of 50℃ and 80℃ 44
Fig. 3-5. Adiabatic flame temperature with respect to vapor humidified ratios for the NG, H₂ boilers 46
Fig. 3-6. NOx emission concentration of the one-D model combustor with respect to vapor humidified ratio for the NG, H₂ boilers[이미지참조] 47
Fig. 3-7. Thermal efficiency with respect to boiler outlet temperature for the NG-H₂ boilers 49
Fig. 4-1. Proposed heat recovery boiler with water spray (HR-B/WS) into side heat exchanger 52
Fig. 4-2. Efficiency map of exhaust gas temperature and flame temperature according to air ratio change 54
Fig. 4-3. Heat and mass indexes and temperature of the exhaust gas and preheated air for NG and H₂ 56
Fig. 4-4. Heat and mass indexes and temperature of the exhaust gas and preheated air for water sprayed NG and H₂ 58
Fig. 4-5. Heat recovery boiler with water spray prepared for preliminary experimental study 60
Fig. 4-6. Schematic diagram of mass and heat balance analysis for the rudimentary HR-B/WS system 64
Fig. 4-7. Analysis of efficiency increase factors of the HR-B/WS with the return water temperature 68
Fig. 4-8. Actual shape and drawing of heat recovery boilers with water spray 70
Fig. 4-9. Heat and mass balances of the 60℃ return water temperature 75
Fig. 4-10. Heat and mass balances of the 60℃, 50℃ and 40℃ return water temperature 77
Fig. 4-11. Variations of NOx and CO with the return water temperature for the Ba-B and HR-B/WS at full load condition[이미지참조] 79