FEATURES

  • The waste heat recovery power plant recovers heat from the high-temperature exhaust gas discharged from various plants, and generates electric energy.
  • Many cement plants installed the system because of its excellent energy-saving effects.
  • The system is being used to recover waste heat not only at cement plants but also at steel-making and non-ferrous smelting plants.

 

 

 

 

 

 

 

 

 

 

 

Waste Heat Recovery Power Generator (Conch Cement in China)

 

BASIC CONCEPT OR SUMMARY

  • The priciple is explained based on waste heat recovery power plant for cement plants where many system have been install.
  • The waste heat recovery recovery power plant for cement plants consists of two waster recovery boiler - a PH boiler and a AQC boiler - both of which boiler are installed in the waste gas line.
  • The PH boiler recovers waste heat from the preheater used for pre-heating raw materials (Boiler inlet gas temperature:320 oC).
  • The AQC boiler waste heat from the air quenching cooler that quenches baked clinker ((Boiler inlet gas temperature: 360ºC). A new gas take off point is installed at high gas temperature side on the AQC for high efficiency.

 

 

 

 

 

 

 

 

 

System diagram of heat recovery power plant for cement plants

EFFECTS AND REMARKS

  • Self - developed Technology
  • Cement plants have reduced electric energy used at the entire plant by 30%
  • At a standard plant where daily production of clinker is 5,000 tons, 9,000 kW can be generated at the
    generator terminal worth ¥550,000,000 annually (assuming the unit price of electric energy is ¥7.9/kWh).
  • In terms of CO2 emission, this reduction is equivalent to 54,000 tons.