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Distillation & Evaporation > Evaporation > Flashcards

Evaporation Flashcards

1
Q

Multiple effect evaporation technology works on what principal regarding pressure and temperature of water?

A

Water boils at a lower temperature when pressure is reduced

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2
Q

What evaporators are in the 1st effect?

A

Evaporators #1-4

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3
Q

What evaporators are in the 2nd effect?

A

Evaporators #5-8

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4
Q

Which effect evaporators operate under a higher vacuum pressure?

A

1st effect evaporators

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5
Q

What are the two heating sources for the 1st effect evaporators?

A

MP steam & 200 proof ethanol vapors

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6
Q

What is the one heating source required for the 2nd effect evaporators?

A

1st effect vapors

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7
Q

List the three process streams created in the Evaporation System and its final use.

A

Syrup- Mixed with solids to form DDGS
Steam Condensate- Reused in Deaerator
Process Condensate- Used as cook water

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8
Q

What is the main feed to the 1st effect evaporators?

A

Thin Stillage

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9
Q

What is the name of the main product that feeds from the 1st effect evaporators to the 2nd effect evaporators?

A

Mid Stillage

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10
Q

What percentage solids is the syrup that flows from Evaporator #8?

A

36-42%

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11
Q

What is the purpose of the evaporators?

A

Vaporize water out of thin stillage feed stream

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12
Q

What type of exchanger are the falling-film evaporators?

A

Shell and tube

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13
Q

Where are the separator tanks located?

A

Directly below the falling-film evaporators

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14
Q

In the falling-film evaporator, what part of the exchanger does the thin/mid stillage flow? Where does the heat source flow?

A

Thin/mid stillage flows down through tubes
Heat source flows through shell side

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15
Q

What happens to the stillage as it encounters low pressure in the separator tank?

A

Water flashes out of the stillage

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16
Q

Where does the majority of the stillage in the separator tank flow to?

A

Re-circulated back to the top of the evaporator

17
Q

What three vapors condense on the shell side of the falling-film evaporators? Which evaporators?

A

200 Proof- Evaporators #1/2
Steam condensate- Evaporators #2-4
Process condensate- Evaporators #5-8

18
Q

Which effect vapors produces the LP steam flowing in the Beer Column and Side Stripper as a heat source?

A

2nd effect

19
Q

What system requires the function of the Evaporation System to operate?

A

Distillation System

20
Q

What are the two main purposes of the Evaporator Pumps?

A

Re-circulate stillage from bottoms of evaporators to the tops
Pump a portion of stillage from the bottoms of evaporators to the next

21
Q

What are the two flows out of the Steam Condensate Receiver?

A

A portion of steam/condensate flashes into steam and flows to 1st effect vapor line. Remaining condensate flows to the Deaerator

22
Q

Why does condensate feed to the Steam Condensate Receiver flash into a vapor?

A

The Steam Condensate Receiver operates at a lower pressure than the pressure in the feed line

23
Q

What is the name of the condensate on the shell side of the 2nd effect evaporators? Where does it flow to?

A

Process condensate. Process Condensate Receiver

24
Q

What two places can the Process Condensate Receiver Pump flow to?

A

Cook Water Tank & Thin Stillage Tank

25
Q

What is the purpose of the Evaporator Process Condensate Filters?

A

Remove particulates in condensate to the Cook Water Pre-heater to prevent fouling in the exchanger

26
Q

What is the purpose of the Evaporator Drain Pump?

A

Drains evaporators for offline cleaning processes

27
Q

What two evaporators can the Syrup Draw Pump pull from?

A

Evaporator #7 & #8

28
Q

Why might we flow syrup to the Thin Stillage Tank?

A

Off-spec density (%Solids) of syrup

29
Q

During normal operation where does syrup from the Syrup Draw Pump flow to?

A

Syrup Tank

30
Q

Why is the Thin Stillage Tank essential for steady operation of the evaporators?

A

Thin Stillage Tank operates as a buffer for flow irregularities to the evaporators

31
Q

Which Evaporator receives the thin stillage feed stream from the Evaporator Feed Pump?

A

Evaporator #1

32
Q

What is the main purpose of syrup?

A

Increases protein content of DDG

33
Q

What five pieces of equipment receive syrup from the Dryer Syrup Pumps?

A

Centrifuge Conveyor #1
Centrifuge Conveyor #4
Dryer B Mixer
Dryer D Mixer
Wet Pad Conveyor #1

Distillation & Evaporation (4 decks)

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