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Energy and biofuels Quiz 6

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Theme: Energy and biofuels EB Quiz 6 Energy and biofuels Quiz 6

Energy and biofuels Quiz 6

Read the following articles before attempting this quiz:

Energy production with options for increased power production
Steam parameters
Firing black liquor dry solids
Increased feed water and air temperature
Back-pressure turbines with controlled extraction
Improvement for sootblowing
Condensing turbine with controlled extraction
Flue gas heat recovery

Energy and biofuels Quiz 6

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Question 1 of 10

1. Question
1. What is the primary source of energy in a modern pulp mill?
- A. Bark combustion in the recovery boiler
- B. Natural gas boilers
- C. Black liquor combustion in the recovery boiler
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Question 2 of 10

2. Question
2. What is the main benefit of surplus steam in a pulp mill?
- A. It can be used for additional electricity generation.
- B. It reduces the need for chemical additives in the pulping process.
- C. It is stored for later use.
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Question 3 of 10

3. Question
3. What has been the typical maximum main steam temperature in modern recovery boilers?
- A. Around 450 °C
- B. Around 550 °C
- C. Around 515 °C
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Question 4 of 10

4. Question
4. Why can steam parameters not always be raised in eucalyptus-based mills?
- A. Eucalyptus black liquor burns too slowly.
- B. High chlorine and potassium levels increase corrosion risks.
- C. Eucalyptus contains too much moisture.
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Question 5 of 10

5. Question
5. What is the normal dry solids range for as‑fired black liquor in new mills?
- A. 80–85%
- B. 90-95%
- C. 50–60%
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Question 6 of 10

6. Question
6. What is the main effect of increasing black liquor dry solids from 65% to 80%?
- A. Steam generation decreases by more than 7%.
- B. Steam generation increases by more than 7%.
- C. Steam generation does not change.
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Question 7 of 10

7. Question
7. What is one method to increase electricity production without changing steam parameters?
- A. By reducing the size of the condenser pipes and the turbine.
- B. Reducing sootblowing frequency.
- C. Preheating feedwater and combustion air using extraction steam.
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Question 8 of 10

8. Question
8. Which turbine configuration is commonly used in modern pulp mills for maximum efficiency?
- A. Single-stage impulse turbine combined with a micro-turbine.
- B. Only a single condensing turbine.
- C. A back‑pressure turbine combined with a condensing tail.
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Question 9 of 10

9. Question
9. What is a typical pressure level for sootblowing steam in modern systems?
- A. 27-40 bar
- B. 2–4 bar
- C. 14–22 bar
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Question 10 of 10

10. Question
10. What is a common method for recovering heat from flue gases?
- A. By using fans to blow the heat back into the boiler room.
- B. Venting flue gases without heat exchange.
- C. Condensing or non‑condensing heat recovery to heat water or combustion air.
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This page has been updated 02.04.2026

Energy and biofuels

Introduction to Energy and biofuels
Global forest industry energy use
Production processes recovery and energy
- 📋 Theme Quiz 1
Chemical recovery
Energy consumption trends in forest industry
Defining the energy consumption in modern processes
Energy supply in forest industry
Energy production with options for increased power production
Novel solutions in the pulp mill energy supply
Improvement of energy efficiency

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