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Table 9 Stream data for the combined 1G and 2G ethanol plant

From: Heat integration of combined 1st and 2nd generation ethanol production from wheat kernels and wheat straw

Stream no.

 

Flow (kg/s)

Tin(°C)

Tout(°C)

Heat load (MW)

 

Hot streams

27.8

90

38

4.5

44

Liquefied stream to SSF

    

45

Flash from pretreatment to WWT mixed stream

0.4

190

80

0.6

46

Condensing 4-bar flash steam from pretreatment

1

144

140

2

46

Cooling 4-bar flashed steam to WWT mixed stream

0.2

99

94

0.3

47

Slurry to SSF

15.3

100

55

2

48

Hydrolysate to yeast cultivation

2.2

35

30

0

49

Stillage from stripper to separation

64.6

110

80

7.3

50

Condensing overhead vapor from stripper

10.7

100

89

18.4

51

Condensing rejected stream molecular sieve

1.4

72

48

1.9

52

Condensing 99.5% ethanol stream

3.9

72

47

3.7

52

99.5% ethanol to storage

3.9

47

35

0.1

53

Condensate from evaporation to WWT

37.2

81

45

5.2

54

Condensing overhead vapor from last evaporation step

12.1

63

60

28.4

54

Condensed vapor from last evaporation step to WWT

12.1

60

45

0.7

55

WWT mixed stream from pretreatment to WWT

1.5

90

45

0.3

56

Stillage from rectifier to WWT

6.8

84

45

1

57

Condenser rectifying column

5.3

47

46

6.6

 

Cold streams

4.5

10

45

0.6

58

Fresh water to liquefaction

    

59

Temperature adjustment of liquefied stream to SSF

35.7

31

32

0.1

60

SSF broth to stripper column

75.4

34

100

18.2

61

Overhead vapor rectifier to dehydration

5.3

47

72

0.2

62

Thin stillage after separation to evaporation

53.9

80

129

10.7

62

Evaporation of thin stillage: first step

53.9

129

133

16.7

64

Live steam for wheat straw in reactor

15.4

97

190

5.8

65

Live steam heating in liquefaction

26.6

60

94

2.9

66

Preheating of wheat kernels and water for liquefaction

26.6

38

60

1.8

67

Reboiler stripper column

64.6

109

110

20.5

68

Reboiler rectifying column

6.8

83

84

11.4