buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

More documents

Recommendations

Info

16 Antonino La Rocca et al. In Fig. 8: ENG (47.7% of ELNG) is the exergy of the exit stream of NG regasified; EL.CO (25.7% of ELNG) is the exergy of cold available during the regasification process of LNG delivered in the Ethane condenser (see Fig.2); EL.CU1 (6.4% of ELNG) is the exergy of cold available during the regasification process of LNG delivered in the LNG cryogenic heater CU1; EL.CU2 (4.3% of ELNG) is the exergy of cold available during the regasification process of LNG delivered in the cryogenic heater CU2; ED.PS (15.9/% of ELNG) represents the exergy destroyed by the whole amount of pressure losses in the regasification facility of Fig. 2 by the LNG side. Fig. 8 shows also a detail of the above parameters and splits each part of exergy exchanged in the regasification facility indicating the item pertaining to exergy recovered in the Ethane condenser, in the cryogenic LNG heaters and the item pertaining the pressure losses in the whole regasification facility. The exergy delivered in the Ethane condenser requires a thorough analysis, the results obtained are shown in Fig. 8. The item ER.EL is the part of LNG exergy which is recovered as electric power produced by the Power Cycle working with Ethane. This cycle has a mean overall efficiency of a 14% and it produces a rated power of 3.2 MW (16.7% of input exergy delivered by LNG in the Ethane condenser), exergy losses in the Ethane pump unit (ED.PU) amounts to a 0.10% of input exergy. The item ER.PU is the part which is recovered and then used to drive the Ethane pump and it represents a 0.30% of input exergy. The ER.CU indicates the exergy recovered in the Ethane preheater CU (see Fig. 2) and ED.CU indicates the exergy destroyed, the nomenclature used in the Fig.8 with the prefix ER (e.g.: ER.CU1) indicates the exergy recovered in the device named with the same symbol in Fig. 2, those with the prefix ED (e.g.: ED.CU1) indicates the exergy destroyed in each device. The item ED.P (7.1% of input exergy) indicates the exergy destroyed by the pressure losses along the Ethane Loop. 4. Production of Electric Energy from Regasification of LNG The analysis performed at Dipartimento dell’Energia, Palermo University, on this subject includes two ventures: one of them pertains to a CHP Binary Cycle composed of two Brayton Cycles whose Bottom cycle works with Helium and another has the Bottom cycle working with Nitrogen but the pressures of the cycle have been selected, after an optimization analysis, higher than those pertaining the Process described in (Snamprogetti, 1978). Heat transfer Equipment proposed are also analysed designing a suitable heat transfer matrix to improve the processes analysed. 4.1.The Process Proposed The process proposed for this application is shown in Fig. 9. The Top cycle includes a modern gas turbine system working at high temperatures which
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 17 is shown in the higher part of figure at left. The bottom Cycle, which is shown in the higher part of figure at right, works with Helium, the higher pressure is 22.6 bar and the lower is 3 bar; the temperature of Helium at the inlet in GTbottom turbine is 480°C, then Helium coming out of gas turbine gives heat to LNG in the Cryogenic Regasifier and it is cooled down to -129°C, it is then pumped by the Cryogenic Compressor C2 and at the exit it has a temperature of 74°C. Fig. 9 – The modular process proposed for regasification of LNG (Dispenza et al., 2006). The heat exchanger managing the LNG to be regasified has a heat transfer matrix made with tubes having a special extended surfaces (Fig. 10). LNG crosses the units from the tube side while Helium flows from the shell side. Tubes have turbulence promoters inside and the hollow tie rods on the shell side have windows of rectangular shape with rounded corners, this feature assures lateral injection in the stream crossing the matrix enhancing turbulence. In the plant proposed there are four Heat Exchangers: a train of two is in series and then the trains are connected in parallel. The shell of a unit has an external diameter of 1.20m and is 8.50m long; there are 300 tubes of Stainless Steel suitable for cryogenic exploitation which have an external diameter of (3/4)”. The cold box has the following dimensions: 3.60m ×3.60m ×9.50m. The exchangers for heating Helium are two units with a feature of the heat transfer
Page 1: BULETINUL INSTITUTULUI POLITEHNIC D
Page 5 and 6: BULETINUL INSTITUTULUI POLITEHNIC D
Page 7: VICTOR COTOROS şi EMIL BUDESCU, As
Page 10 and 11: ALEXANDRU RADU, CONSTANTIN PANĂ an
Page 15 and 16: Bul. Inst. Polit. Iaşi, t. LVIII (
Page 27: Bul. Inst. Polit. Iaşi, t. LVIII (
Page 42 and 43: 30 Daniel Dragomir-Stanciu and Mari
Page 44 and 45: 32 Daniel Dragomir-Stanciu and Mari
Page 64 and 65: 52 Ionel Oprea and low viscosity ar
Page 66 and 67: 54 Ionel Oprea COP PT Puterea speci
Page 68 and 69: 56 Ionel Oprea 8. GWP - global warm
Page 70 and 71: 58 Ionel Oprea suplimentari, cum ar
Page 72 and 73: 60 Răzvan Florin Barzic et al. Cur
Page 74 and 75: 62 Răzvan Florin Barzic et al. 3-
Page 76 and 77: 64 Răzvan Florin Barzic et al. 3.
Page 78 and 79:
66 Ionel Ivancu et al. the second s
Page 80 and 81:
68 Ionel Ivancu et al. a b Fig. 4 -
Page 82 and 83:
70 Ionel Ivancu et al. Gut J.A.W.,
Page 84 and 85:
72 Ion Zabet and Graţiela-Maria Ţ
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
82 Victor Pantilie et al. many rese
Page 96 and 97:
84 Victor Pantilie et al. industria
Page 98 and 99:
86 Victor Pantilie et al. Another i
Page 100 and 101:
88 Victor Pantilie et al. At the en
Page 102 and 103:
90 Victor Pantilie et al. Tang X.,
Page 104 and 105:
92 Alexandru Radu et al. Furthermor
Page 106 and 107:
94 Alexandru Radu et al. Spark timi
Page 108 and 109:
96 Alexandru Radu et al. Fig. 3 - B
Page 110 and 111:
98 Alexandru Radu et al. 4. The bes
Page 113 and 114:
BULETINUL INSTITUTULUI POLITEHNIC D
Page 115 and 116:
Bul. Inst. Polit. Iaşi, t. LVIII (
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127:
Page 130 and 131:
118 Eugen Rusu et al. in PM emissio
Page 132 and 133:
120 Eugen Rusu et al. also be used
Page 134 and 135:
122 Eugen Rusu et al. Fig. 3 - Maxi
Page 136 and 137:
124 Eugen Rusu et al. Fig. 6 - HC e
Page 138 and 139:
126 Eugen Rusu et al. Pe lângă ce
Page 140 and 141:
128 Adrian Sabău et al. arguments
Page 142 and 143:
130 Adrian Sabău et al. The energy
Page 144 and 145:
132 Adrian Sabău et al. during fue
Page 146 and 147:
134 Adrian Sabău et al. 11 T ⎛ 0
Page 148 and 149:
136 Adrian Sabău et al. No experim
Page 150 and 151:
138 Adrian Sabău et al. calculated
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163:
Page 166 and 167:
154 Marius Receanu et al. where: qr
Page 168 and 169:
156 Marius Receanu et al. In Fig. 2
Page 170 and 171:
158 Marius Receanu et al. the ambie
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181:
Page 184 and 185:
172 Mariana Lupchian Propulsion eng
Page 186 and 187:
174 Mariana Lupchian Fig. 1 - The p
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197:
Page 200 and 201:
188 Costică Atanasiu et al. comput
Page 202 and 203:
190 Costică Atanasiu et al. γ= ε
Page 204 and 205:
192 Costică Atanasiu et al. The sa
Page 206 and 207:
194 Costică Atanasiu et al. Fig. 1
Page 208 and 209:
196 Costică Atanasiu et al. elasti
Page 210 and 211:
198 Ovidiu Niţă et al. rejection
Page 212 and 213:
200 Ovidiu Niţă et al. aluminium
Page 214 and 215:
202 Ovidiu Niţă et al. a b Fig. 5
Page 216 and 217:
204 Ovidiu Niţă et al. căreia ac
Page 218 and 219:
206 Ovidiu Niţă and Vasile Braha
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
214 Marian Teodor Popescu et al. 2.
Page 228 and 229:
216 Marian Teodor Popescu et al. Sp
Page 230 and 231:
218 Marian Teodor Popescu et al. Th
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239:
Page 242 and 243:
230 Victor Cotoros and Emil Budescu
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289 and 290:
Page 291 and 292:
Page 293 and 294:
Page 295 and 296:
Page 297 and 298:
PC Cell calibration Bul. Inst. Poli
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317:
show all

buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

Create successful ePaper yourself

Delete template?

Save as template?