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Heat Integration

Heat Integration. An Introduction to Heat Exchanger Network (HEN) Design. By: Anwaruddin Hisyam. In this lecture we will learn how to set energy recovery targets for a process. Pinch identification. 178 C. 880. 1620. 180 C. 160 C. 60 C. 2640. 130 C. 210 C. 270 C. Reactor. 160 C.

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Heat Integration

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  1. Heat Integration An Introduction to Heat Exchanger Network (HEN) Design By: Anwaruddin Hisyam Pinch technology series

  2. In this lecture we will learn how to set energy recovery targets for a process. Pinch technology series

  3. Pinch identification Pinch technology series

  4. 178 C 880 1620 180 C 160 C 60 C 2640 130 C 210 C 270 C Reactor 160 C 210 C 149 C 1220 1980 50 C 220 C Base case Pinch technology series

  5. Data Extraction 178 C 880 1620 180 C 160 C 60 C 2640 130 C 210 C 270 C Reactor 160 C 210 C 149 C 1220 1980 50 C 220 C Pinch technology series

  6. 160 C 130 C 210 C 270 C Reactor 160 C 210 C 60 C 50 C 220 C …..from data extraction Pinch technology series

  7. Stream Data (Problem Table) CP = Heat duty/ABS(T source – T target) Pinch technology series

  8. Composite Curve DT min Pinch technology series

  9. Set DTmin = 20 C Pinch technology series

  10. Shifted Stream DataHot - ½DTmin; Cold + ½DTmin Pinch technology series

  11. Shifted Composite Curve 300 250 200 Temp interval (K) 150 100 50 0 0 1000 2000 3000 4000 5000 6000 7000 Heat Duty (kW) Shifted Composite Curve Pinch technology series

  12. 260 220 210 50 170 18 150 20 60 22 50 Cascade Diagram Cold-Hot Hot Cold Stream population Pinch technology series

  13. 260 0 220 720 210 200 - 1000 170 150 - 600 60 - 420 - 200 50 Heat balance in the interval Hot utility Heat flow -720 520 1200 -400 -180 -220 Cold utility Pinch technology series

  14. The heat flow must NOT be negative Pinch technology series

  15. Hot utility 260 0 -720 220 720 520 200 210 1200 - 1000 170 -400 - 600 150 -180 - 420 60 -220 - 200 50 Cold utility Normalization Need additional heat Pinch technology series

  16. Original Grand Composite Curve Unfeasible region Feasible region Pinch technology series

  17. Hot utility 260 1000 -720 220 1720 520 1200 210 1200 0 170 -400 400 150 -180 580 60 -220 800 50 Cold utility …finding pinch No heat flow at this point Eureka....! This is the PINCH Pinch technology series

  18. Grand Composite Curve Qh min Qc min Pinch technology series

  19. finally….The PINCH POINT = 170 Cwhich means thatHot stream PINCH = 170+½DTmin = 180Cold stream PINCH = 170-½DTmin = 160 Pinch technology series

  20. Heat source and sink • Heat source  this part releases heat • Heat sink  this part requires heat PINCH Heat Source Heat Sink Pinch technology series

  21. and, how can we design HEN based on the pinch? Pinch technology series

  22. 2640 880 C 60 220 1980 160 270 H H 210 50 1620 1220 H 210 160 Base case….the existing network Heat recovery = 1980 + 880 = 2860 kW Cold utility = 2640 kW Hot utility = 1220 + 1620 = 2840 kW Pinch technology series

  23. Let’s start from the pinch Pinch technology series

  24. PINCH AT 170 BELOW ABOVE CP 180 60 22 220 2640 880 180 18 160 360 1640 270 160 210 20 2200 50 1000 160 210 160 50 0 2500 Pinch technology series

  25. Rules…. • CP in ≤ CP out • Start finding partners for streams OUT (with streams IN, away from pinch, or utility) • N stream IN ≤ N stream out • If Ns IN > Ns OUT, split stream(s) OUT • If CP in > CP out (no match), try to split stream(s) IN • Set maximum heat recovery • The remaining heat duty is covered by heater or cooler Pinch technology series

  26. 180 1 60 220 180 160 270 √ 160 1 2200 210 50 2200 160 210 160 Step 1: Below the PINCH Connect S1(22) and S3(20) CP in < CP out Pinch technology series

  27. 180 1 60 220 1620 180 √ 2 160 1620 270 √ 160 1 2200 50 210 2200 160 2 210 160 Step 2: Above the PINCH Connect S2(18) and S4(50) CP in < CP out Pinch technology series

  28. 880 180 √ 1 3 60 220 880 1620 180 √ 2 160 1620 270 √ 160 1 2200 50 210 2200 160 √ 3 2 210 160 2500 Step 3: Above the PINCH Connect S1(22) and S4(50) CP in < CP out Pinch technology series

  29. 880 180 √ 1 3 60 220 880 1620 180 √ 2 160 1620 270 1000 √ 160 √ H 1 2200 50 210 1000 2200 160 √ 3 2 210 160 2500 Step 4: Above the PINCH Install Heater at S3(20) Pinch technology series

  30. Step 5: Below the PINCH Install Cooler at S1(22) and S2(18) 440 880 √ 180 √ C 1 3 2640 60 220 880 360 1620 √ 180 √ C 2 360 160 1620 270 1000 √ 160 √ H 1 2200 50 210 1000 2200 160 √ 3 2 210 160 2500 All heat requirements have been met !!! Pinch technology series

  31. 880 C 60 220 1620 440 C 160 270 1000 360 H 50 210 2200 210 160 …finally…Heat Exchanger Network (HEN) Maximum Energy Recovery (MER) = 2200 + 880 + 1620 = 4700 kW Minimum cooling heat duty (Qc min) = 440 + 360 = 800 kW Minimum heating heat duty (Qh min) = 1000 kW Pinch technology series

  32. 177.6 C 880 160 C 1620 180 C 130 C 360 210 C 270 C Reactor 220 C 160 C 210 C 160 C 180 C 1000 440 2200 60 C 50 C 80 C Then draw the flowsheet… Pinch technology series

  33. Possible modifications Pinch technology series

  34. Grand Composite Curve MP steam Heat generation Cooling water Pinch technology series

  35. Thank you Pinch technology series

  36. Working Session Pinch technology series

  37. H= 27 MW Feed 2 230 C H=-30 MW 140 C 200 C Product 2 80 C Reactor 2 Feed 1 180 C 250 C 40 C 20 C H=32 MW 40 C Reactor 1 H= -31.5 MW 40 C Product 1 How will the HEN be….? Pinch technology series

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