표제지
ABSTRACT
NOMENCLATURE
SUBSCRIPTS
목차
第1章 緖論 16
1-1. 硏究의 背景과 動向 16
1-2. 硏究의 目的과 方法 18
1-3. 自然循環 보일러의 多變數시스템 18
1-3-1. 外亂 (Disturbances) 19
1-3-2. 操作量(Manipulated variables) 19
1-3-3. 制御量(controlled variables) 21
第2章 自然循環 가스보일러의 드럼水位와 壓力制御에 관한 動的解析 25
2-1. 理論解析에 대한 背景 25
2-2. 基本方程式 27
2-3. 代數學的 解析에 의한 水位制御의 傳達函數-方法 I 31
2-3-1. 基本的인 解析 31
2-3-2. 蒸氣流量外亂 ⊿MS[이미지참조] 39
2-3-3. 給水流量外亂 ⊿MW[이미지참조] 41
2-3-4. 加熱熱量의 外亂 ⊿QAV[이미지참조] 46
2-3-5. 給水溫度의 外亂 ⊿θW[이미지참조] 49
2-3-6. 드럼壓力外亂 ⊿P 53
2-3-7. 水位制御에 관한 블럭線圖와 誘導된 傳達函數 - 方法 I 55
2-3-8. 壓力變化率에 대한 密度變化率의 微分上 意味 (∂ρf/∂(⊿P))[이미지참조] 57
2-4. 熱力學的 解析에 의한 水位制御의 傳達函數 - 方法 II 64
2-4-1. 序言 64
2-4-2. 蒸氣量外亂 ⊿MS[이미지참조] 65
2-4-3. 蒸發系 壓力外亂 ⊿P 72
2-4-4. 蒸發管內의 加熱된 熱量外亂 ⊿QAV[이미지참조] 73
2-4-5. 給水流量外亂 ⊿MW[이미지참조] 81
2-4-6. 給水溫度外亂 ⊿θW[이미지참조] 93
2-4-7. 全體的인 傳達函數와 블럭線圖 - 方法 II 103
2-5. 熱力學的 解析에 의한 드럼壓力에 대한 傳達函數 - 方法 II 104
2-5-1. 燃料量 MFu와 蒸發傳達面의 燃燒가스熱量 QAV[이미지참조] 104
2-5-2. 蒸發傳達面의 燃燒가스熱量 QAV와 作業流體에 傳達된 熱量 QSV[이미지참조] 105
2-5-3. 證發熱量 QSV (作業流體)와 蒸發시스템內에서 蒸發된 蒸氣量 MSVirV[이미지참조] 108
2-5-4. 給水流量 MW, 燃料量 MFu, 給水溫度 θFW, 절탄기에서 發生한 蒸氣流量 MSVirE.[이미지참조] 109
2-5-5. 蒸氣流量 MS와 蒸發시스템壓力 P[이미지참조] 110
2-5-6. 全體的인 傳達函數 블럭線圖 114
2-6. 壓力과 水位의 相關關係를 고려한 自然循環 가스보일러의 全體的 블럭線圖 117
第3章 方法I과 方法II의 解析에 의해 誘導한 自然循環 가스보일러의 制御傳達函數 比較 121
3-1. 제반 假定條件 및 그 結果에 대한 分析 121
3-2. 相異한 動特性을 고려한 分析 126
3-2-1. 壓力外亂과 蒸氣流量外亂 126
3-2-2. 蒸發部 加熱熱量外亂 QSV[이미지참조] 127
3-2-3. 給水量外亂 ⊿MW[이미지참조] 128
第4章 誘導된 傳達函數에서 計算値와 測定値의 比較 130
4-1. 序言 130
4-2. 自硏循環 가스보일러의 實驗모델 設計値 131
4-2-1. 蒸氣變化量 ⊿MS가 壓力 p와 水位 h에 미치는 影響[이미지참조] 132
4-2-2. 燃料供給量 ⊿MFu와 蒸氣流量 ⊿MS가 壓力 p와 水位 h에 미치는 影響[이미지참조] 141
4-3. 測定과 計算의 比較에 대한 要約 152
4-3-1. 測定에 대한 說明 152
4-3-2. 線形微分方程式의 時間變化에 無關한 係數들의 負荷變化에 따른 影響 154
第5章 結論 157
附錄 159
REFERENCES 167
Table 4-I. Pressure variation (dp/dt) - comparison of measurement width reckoning.... 136
Table 4-II. Water level variation (dh/dt) - comparison of measurement and reckoning... 139
Table 4-III. Pressure variation (dp/dt) - comparison of measurement and reckoning... 145
Table 4-VI. Time invariant coefficient of load 155
Fig. 1-1. General schematic block diagram manipulated controlled variables and disturbances on natural-circulation gas boiler system 20
Fig. 1-2. Mutual influence of manipulated controlled variables and disturbances 21
Fig. 1-3. Simple influence schematic 22
Fig. 1-4. Schematic block diagram of pressure control and water level control in the drum on natural circulation gas boiler system 24
Fig. 2-1. Schematic of natural circulation gas boiler 26
Fig. 2-2. Transient response for steam flow disturbance 41
Fig. 2-3. Transient response for feed water flow disturbances 44
Fig. 2-4. Transient response for heat transfer rate disturbances 48
Fig. 2-5. Transient response for pressure disturbances 54
Fig. 2-6. Block diagram of positive input signal for water level control - method I 56
Fig. 2-7. Model of evaporation point from VA1 to VA2[이미지참조] 57
Fig. 2-8. Linearization of i'(t) and P(t) 58
Fig. 2-9. Transient response for steam flow disturbance - method II 72
Fig. 2-10. Transient response for pressure disturbance - method II 73
Fig. 2-11. Transient response for heat transfer rate disturbance - method II 80
Fig. 2-12. Transient response of feed water flow disturbance 86
Fig. 2-13. θ - s diagram in steam over drum 88
Fig. 2-14. Transient response for feed water flow - method II 93
Fig. 2-15. Transient response of feed water temperature disturbance for feeding to upper water level - method II 102
Fig. 2-16. Total block diagram for control of water level - Method II 103
Fig. 2-17. Block diagram of pressure control system in the drum for natural circulation boiler 116
Fig. 2-18. Block diagram of pressure control and water level control system in the drum for natural circulation boiler 120
Fig. 4-1. Pressure variation (dp/dt) - comparison of measurement with reckoning - Method I, II (⊙ measurement point) 137
Fig. 4-2. Vater level variation rate (dh/dt) - comparison of measurement with reckoning - Method I, II (⊙measurement data) 140
Fig. 4-3. Pressure variation (dp/dt) - comparison of measurement and reckoning-Method I, II (蒸氣量 60 ton/h) 146
Fig. 4-4. Pressure variation (dP/dt) - comparison of measurement and reckoning-Method I, II (蒸氣量 100 ton/h) 147
Fig. 4-5. Water level variation (dh/dt) - comparison of measurement and reckoning-Method I, II 151
Fig. 4-6. Linear differential equation for invariant coefficient of load 156
Fig. A-1. Volume, energy and weight of vapourization system in drum of natural circulation boiler 161
Fig. A-2. Variation of (∂X/∂P)s for dry degree of vapor in vaporization system 163
Fig. A-3. Pressure depression velocity (dp/dt)WCL. for drum pressure and diameter of riser tube in vaperization system...[이미지참조] 166