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Energy Integration

& Steam Economy

 

 

 

 

Based on:

 

Pinch Analysis

 

 

 

Process Simulation &

 

 

Desmet Ballestra / Hytech Expertise

 

 

 

 

 

 

 

 

Kansas City - June 2009

Author: Marcelo Ferrero

What is Pinch Analysis?

Desmet / Hytech

A systematic methodology based on thermodynamic principles to achieve utility savings by better process heat integration, maximizing heat recovery and reducing the external utility loads (cooling water and heating steam).

Hot and Cold Composite Curves

Desmet / Hytech

T (ºC)

Heat Recovery Zone

 

Pinch

TPinchHot

 

TPinchCold

Tmin.

 

Q (kW)

QC min.

QH min.

Process to Process

Process to Process

TPinchHot

: Must not use cooling utility above this temperature

Exchangers (Economizers)

Exchangers (Economizers)

TPinchCold

: Must not use heating utility below this temperature

+

+

QC min. : Minimum Cold Utility (Cooling Water)

Coolers (Cooling Water)

Heaters (Heating Steam)

QH min. : Minimum Hot Utility (Heat Steam)

Pinch Analysis

Desmet / Hytech

General Process Flow

Meal

Dryer

Grain

Grain

 

Preparation

 

SEP

Edible

Feed

Dryer

 

 

Oil

 

 

 

 

Boiler

Pinch Analysis

Desmet / Hytech

Case I - SEP (Solvent Extraction Plant)

Meal

Dryer

Grain

Grain

 

Preparation

 

SEP

Edible

Feed

Dryer

 

 

Oil

 

 

 

 

Boiler

Pinch Analysis - Case I

Desmet / Hytech

Process Flow Diagram - I

Pinch Analysis - Case I

Desmet / Hytech

Process Flow Diagram - II

Pinch Analysis - Case I

Desmet / Hytech

Hot Streams Curves

105

T (ºC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

95

 

 

 

 

 

 

 

 

 

 

 

85

 

 

 

 

 

 

 

 

 

 

 

75

 

 

 

 

 

 

 

 

 

 

 

65

 

 

 

 

 

 

 

 

 

 

 

55

 

 

 

 

 

 

 

 

 

 

 

45

 

 

 

 

 

 

 

 

 

 

 

35

 

 

 

 

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

 

 

 

 

0

1

2

3

4

5

6

7

8

9

10

11

 

 

 

 

 

 

 

 

 

 

Thousand Q (kW)

 

Vapors to Vacuum Condenser

 

Oil From Stripper

 

 

 

Vapors from DT

 

Water Effluent From Waste Water Evpaorator

 

 

 

Vapors to Stripper Condenser

 

 

 

 

 

 

 

 

Pinch Analysis - Case I

Desmet / Hytech

Cold Streams Curves

105

T (ºC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

95

 

 

 

 

 

 

 

 

 

 

 

85

 

 

 

 

 

 

 

 

 

 

 

75

 

 

 

 

 

 

 

 

 

 

 

65

 

 

 

 

 

 

 

 

 

 

 

55

 

 

 

 

 

 

 

 

 

 

 

45

 

 

 

 

 

 

 

 

 

 

 

35

 

 

 

 

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

 

 

 

 

0

1

2

3

4

5

6

7

8

9

10

11

Thousand Q (kW)

Miscella to Evaporation

Solvent to Extractor

Water Effluent to Waste Water Evaporator

Pinch Analysis - Case I

Desmet / Hytech

Hot and cold composite curves

105

 

 

T (ºC)

77ºC

 

95

 

 

 

 

85

75

65

55

73ºC

Pinch

Zone

69ºC

65ºC

Cold Stream

45

Hot Stream

35

25

0

5

10

15

20

25

Q (kW)

 

Plant Capacity: 5000 TPD

 

Full Miscella: 27%

 

Thousand

 

 

 

 

 

 

Material: Soybean ( Flakes )

 

DT Dome Temperature: 72ºC (162ºF)

 

 

Solvent Retention in Meal: 30%

 

 

 

 

 

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