ENERGETIC AND EXERGETIC ASSESSMENT OF WASTE HEAT RECOVERY SYSTEMS IN THE GLASS INDUSTRY
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1 ENERGETIC AND EXERGETIC ASSESSMENT OF WASTE HEAT RECOVERY SYSTEMS IN THE GLASS INDUSTRY Kyriaki Zourou*, Assist. Prof. Sotirios Karellas Konstantinos Braimakis, Prof. Emmanuel Kakaras
2 Table of contents The case of Glass Industry Thermodynamic optimization of waste heat recovery system Energetic comparison Exergetic comparison Thermoeconomic optimization- Economic evaluation Conclusions
3 Waste Heat Recovery in Glass Industry High Energy Consumption; 300 Tbtu/year 70 % of the consumed energy is devoted to glass melting Glass melting is energy intensive requiring temperatures at about C Exhaust gases around 500 C (typical for old glassworks) Case study Yioula Glassworks S.A. Attiki,Greece The case of Yioula Glassworks S.A kj/ kgglass furnace thermal needs 16 ΜW Fuel consumption 1560 Nm 3 /h Air-fuel ratio λ=1,1 Tgas_out = C Regenerative furnace Waste heat in flue gases 4,0 MW th
4 Temperature [ C] National Technical University of Athens temperature [ C] Temperature [ C] temperature [ C] The Rankine Cycle The exhaust gases leave the system at 180 C industrial constraints 2,7 MWth Only dry fluids examined (no superheating) HT Q Q in in,max th P Q el in sys th water x=0,2 0,4 100 bar bar 1 bar 0,6 p=0,05 bar 0 0,0 2,0 4,0 6,0 8,0 10,0 spezific entropy [kj/kgk] 0,8 4 Specific entropy [kj/kgk] VS p=1 bar organic fluids x=0,2 0,4 0,6 10 bar 5 bar 0 1,0 1,2 1,4 1,6 1,8 2,0 spezific entropy [kj/kgk] 0,8 25 bar Specific entropy [kj/kgk]
5 T ( C) Water- Steam Rankine Cycle 600 T-S chart S Kj/kg4 6 8 S (kj/kg K) 10 Assumptions Water condensation temperature/ pressure Gases temperature at the inlet / exit of the WHR system Maximum superheating temperature Isentropic efficiency Turbine Pump 60 C/ 0,198bar 483 /180 C 460 C Electric efficiency/ mechanical efficiency 98% / 99% 80% 70%
6 T ( C) National Technical University of Athens Water Steam Rankine Cycle-Thermodynamic optimization Parameters High pressure value 26,5bar Superheating temperature 460 C Pel 701,8 kw ηth 26,05% ηητ 66,16% ηsys 17,23% Q-T Pinch point water gas Q (Kw)
7 The Organic Rankine Cycle Organic fluid Condensation temperature Tcond( C) Condensation pressure plow (bar) MM 60 0,2598 MDM 66,6 0,05 D4 87,1 0,05 D5 143,2 0,05 toluene 60 0,1843 pentane 60 2,136 Organic fluid CAS-NU p crit (bar) T boil ( C) T crit ( C) MM ,51 100,52 245,6 MDM ,15 152,53 290,94 D , ,35 D ,6 210, Toluene ,06 110,6 318,64 Pentane , ,7
8 Organic Rankine Cycle Non Regenerative ORC- Turbine inlet saturated steam Organic fluid Τcond( C) Condensation pressure plow (bar) MM 60 0,0266 MDM 66,6 0,05 D4 87,1 0,05 D5 143,2 0,05 toluene 60 0,184 pentane 60 0,213 assumptions Exiting gas temperature Maximum temperature of diathermal oil Ιsentropic efficiency Turbine Pump 180 C 380 C 85% 70% Electrical efficiency/ Mechanical Efficiency 98% / 99%
9 Non Regenerative ORC Thermodynamic Optimization Pevap (bar) Tevap ( C) ηhτ ηth ηsys Pel (kw) MM 17, ,64% 14,7% 9,65% 415,0 MDM 12,74 264,056 65,84% 13,79% 9,08% 383,9 D4 11, ,85% 13,09% 8,62% 363,9 D5 10,44 339,1 65,61% 10,82% 7,1% 302,1 toluene 36,9 309,68 68,93% 22,92% 15,8% 642,2 pentane 30,24 189,2 63,15% 14,19% 9,34% 436,3
10 Regenerative ORC Thermodynamic Optimization Pevap (bar) Tevap ηht% ηth% ηsyst % Pel (kw) MM 17, ,84 21, ,1 MDM 12,74 264,06 59,59 26,11 15,56 657,7 D4 11, ,3 25,3 13,74 581,2 D5 10,44 339,1 44,75 24,33 10,89 461,2 toluene 36,9 309,68 65,81 27,67 18,21 772,2 pentane 30,24 189,2 75,34 14,65 11,09 497,0
11 How the regenerator affects the system s efficiency? ηsyspentane 9,3% ηsysmdm 9% 11
12 100% Non Regenerative ORC Flue gases heat input 0,9% self consumption 0,92% other losses 22,3% Power Output 75,28% condenser Regenerative ORC 1,1% self consumption Increased Power output Decreased condensation requirements 100% Flue gases heat input 70% condenser 1,1% other losses 27,75% Power Output 70,05% condenser
![Temperature [ C] The regenerator decreases the exergy destruction in this case](/docs-images/82/85554091/images/13-1.jpg "250 200 Exergy destruction 150 Exergy losses 100 50 0 0 20 40 60 80 100 Heat")
13 Temperature [ C] The regenerator decreases the exergy destruction in this case Exergy destruction 150 Exergy losses Heat [%]
14 EXERGETIC COMPARISON - IRREVERSIBILITIES component Water steam I (kw) N/R ORC I (kw) R ORC I (kw) Gas_oil hex - 117,23 117,23 economizer 31,44 123,17 21 Evaporator 157,29 99,30 94,62 Superheater 64,1 - - Regenerator ,96 Feeding pump 0,86 6,88 8,33 Pump2 0, Turbine 121,8 96,65 117,02 Condenser 219,16 274,26 202,75 Generator losses 22,54 6,56 7,94 Exergy exiting exhaust gases Generator 733,91 617,87 748,14 EXERGETIC EFFICIENCY 29,58% 24,8% 30,15%
15 Table of contents The case of Glass Industry Thermodynamic optimization of waste heat recovery system Energetic comparison Exergetic comparison Economic evaluation Conclusions
16 NPV National Technical University of Athens NPV LOAN 50% OF INVESTMENT COSTS Payback Period Water steam , , , ,00 0, ,00 WATER STEAM RANKINE CYCLE Payback period 7,5 years IRR: 21% , ,00 years SEPC Toluene Regenerative 0,053 /kwh ORC Payback Period 4 years IRR 33% Payback Period ORC , , , , ,00 0, , , ,00 years
17 IRR ( %) How the spot market price affects the feasibility of the investment? WATER STEAM ORC ,0 50,0 100,0 150,0 200,0 250,0 SPOT MARKET PRICE [Euro/MWh el ] The ORC Regenerated with toluene as working fluid can be feasible even at lower spot market prices
18 CONCLUSIONS Given heat source temperature level 500 C: If the condenser is air cooled, ORC systems recover energy more efficiently than water steam systems The use of a regenerator increases the efficiency and the profitability of the project. Toluene and MDM are very competent in the field of waste heat recovery.
19 Thank you for your attention! At your disposal for further analysis!
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