This document discusses waste heat recovery (WHR) systems in cement plants. It describes how WHR can utilize the industrial waste heat generated during cement production through combined heat and power or cogeneration systems to produce steam or electricity. It notes that the rotary kiln in cement plants reaches temperatures of 1300-2200°C but this heat is usually lost to the environment. WHR technologies like organic Rankine cycle and waste heat boilers can capture up to 25% of rejected flue gases and exhaust air to generate additional energy. Industries like cement, glass, steel and refineries are examples where WHR is commonly used. Tri-generation or combined heat, power and cooling systems are also mentioned that simultaneously produce electricity,

1. Course Teacher Group Members
Dr. Waqar Ahmed Abdul Haseeb
MELE/POE/F14/107
Muhammad Asif Mehmood
MELE/POE/F14/105
Waste Heat Recovery System
In Cement Industry
Health Safety & Environment
Summer-2015
GSESIT-FEST
Hamdard University

2. Waste Heat Recovery (WHR)
It’s a utilization of Industrial Waste Heat develop during the manufacturing
of product before it enter in the environment. This Heat energy is utilize by
Combine Cycle/Cogeneration in form of Steam or Electricity for the plant

3. CHP : Combine Heat and Power

4. Heat Exchanger

5. The Rotary Kiln of Cement Plant
• It a steel tube which rotate 250 time per hour.
• At front end the fuel is burn to get 2400F to 4000F
(1300C to 2200C)
• At the exhaust filter clean out the gasses but heat is
usually vanish out to environment

6. WHR in Cement Plant

7. Technology Use
Organic Rankine Cycle:
Examples of working fluids
CFC, HCFCs, HFCs, HCs, PFCs, Flame able byproducts like
(iso-butane, pentane, propane)
Waste heat boilers:
Capture waste heat from exhaust air or from flue gasses.
Approximately 25% of rejected gasses are utilize back.

8. Industry uses Waste Heat Recovery
• Cement industry
• Glass industry
• Steel industry
• Non ferrous furnaces
• Refineries
• IC-engines and gas turbines

9. Industrial Example
Tri-generation,
Combined Heat,
Power and Cooling
(CHPC)
Tri-generation or Tri-gen is the
simultaneous generation of following
from a single heat source.
• Electricity
• Heat( steam / hot water)
• Cooling

10. Thank you