L13 - Low grade heat recovery

Question 1

Waste heat sources

Answer 1

1. Combustion exhausts
   - Glass melting furnace, cement kiln
2. Process off gases
   - Steel electric arc furnace
3. Cooling water
   - From furnaes, air compressors

Question 2

Uses for waste heat

Answer 2

1. Combustion air preheating
2. Boiler feedwater preheating
3. Load preheating
4. Power generaton
5. Steam generation for use in power generation
6. Space heating
7. Water preheating

Question 3

Heat recovery devices

Answer 3

1. Recuperator
2. Regenerator
3. Passive air preheaters