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- 1. PROCESS INTEGRATION PROCESS INTEGRATION LECTURE 8 LECTURE 8 Stream Splitting
- 2. PROCESS INTEGRATION PROCESS INTEGRATION Above the pinch: Above the pinch: 1 3 5 4 2 PINCH 100º 100º 100º 90º 90º T>90º T>90º What do we do? What do we do?
- 3. PROCESS INTEGRATION PROCESS INTEGRATION Split a cold stream Split a cold stream 1 3 5 4 2 PINCH 100º 100º 100º 90º 90º
- 4. PROCESS INTEGRATION PROCESS INTEGRATION Rule: Rule: Above the pinch, N Above the pinch, NH H ≤ ≤ N NC C N NH H= =Number Number of hot streams of hot streams N NC C= =Number Number of cold streams of cold streams
- 5. PROCESS INTEGRATION PROCESS INTEGRATION Below the pinch: Below the pinch: PINCH 1 3 5 4 2 100º 100º 90º 90º 90º T100º T100º What do we do? What do we do?
- 6. PROCESS INTEGRATION PROCESS INTEGRATION Split a hot stream: Split a hot stream: PINCH 1 3 5 4 2 100º 100º 90º 90º 90º
- 7. PROCESS INTEGRATION PROCESS INTEGRATION Rule: Rule: Below the pinch, N Below the pinch, NH H ≥ ≥ N NC C N NH H=Number of hot streams =Number of hot streams N NC C=Number of cold streams =Number of cold streams General Rule: General Rule: always observe always observe N Nout out ≥ ≥ N Nin in
- 8. PROCESS INTEGRATION PROCESS INTEGRATION Example problem: Example problem: 1 3 2 PINCH 100º 100º 90º No feasible match! CP CP 5 4 7 NH ≥ NC But no appropriate CP match
- 9. PROCESS INTEGRATION PROCESS INTEGRATION Solution: Solution: CP CPH H ≥ ≥ CP CPC C N NH H ≥ ≥ N NC C 5 5 4 4 4 4 3 3 7 7 1 3 2 PINCH 100º 100º 90º CP CP 4 4 5 5 4 4 3 3 7 7
- 10. PROCESS INTEGRATION PROCESS INTEGRATION What about? What about? CPH ≥ CPC NH ≥ NC 5 3.5 4 3.5 7 CPH ≥ CPC NH ≥ NC 5 4.5 4 2.5 7 Or:
- 11. PROCESS INTEGRATION PROCESS INTEGRATION Branch flow rates Branch flow rates =degree of =degree of freedom in design freedom in design Finding the best choice Finding the best choice= = optimization problem optimization problem
- 12. PROCESS INTEGRATION PROCESS INTEGRATION Summary Above the pinch: Summary Above the pinch: Stream data at pinch Stream data at pinch N NH H ≤ ≤ N NC C CP CPH H ≤ ≤ CP CPC C For pinch matches? For pinch matches? Split cold stream Split cold stream Split hot stream Split hot stream Place Matches Place Matches YES YES YES NO NO NO NO
- 13. PROCESS INTEGRATION PROCESS INTEGRATION Summary Below the pinch: Summary Below the pinch: Stream data at pinch Stream data at pinch N NH H ≥ ≥ N NC C? ? CP CPH H ≥ ≥ CP CPC C For pinch matches? For pinch matches? Split Hot stream Split Hot stream Split Cold stream Split Cold stream Place Matches Place Matches YES YES YES YES NO NO NO NO
- 14. PROCESS INTEGRATION PROCESS INTEGRATION Working session 8 Working session 8
- 15. PROCESS INTEGRATION PROCESS INTEGRATION Working session 8 Working session 8 0.02 550 200 COLD 4 0.043 900 300 COLD 3 0.04 250 550 HOT 2 0.045 350 750 HOT 1 Heat capacity flowrate CP(MWºC-1) Target Temp. TT(ºC) Supply Temp. Ts(ºC) Type Stream ∆T min=50 ºC QHmin=9.2 Mw QCmin=6.4 Mw
- 16. PROCESS INTEGRATION PROCESS INTEGRATION Grid diagram: Grid diagram: 1 3 4 2 PINCH 750º 550º 900º 550º 350º 250º 300º 200º 550º 500º 500º CP 0. 0.045 0. 0.040 0.043 0.020
- 17. PROCESS INTEGRATION PROCESS INTEGRATION Solution 8 Solution 8
- 18. PROCESS INTEGRATION PROCESS INTEGRATION 1 3 4 2 750º 550º 900º 550º 350º 250º 300º 200º 550º 500º 500º C C C C H H 9.2MW 1MW 8MW 8.6MW 6MW 0.4MW 6MW 1 3 4 2 PINCH 750º 550º 900º 550º 350º 250º 300º 200º 550º 500º 500º CP CP 0.045 0.045 0.04 0.04 0.043 0.043 0.02 0.02