Cooling & Quenching

Hot gas quench systems

Rapid gas cooling via evaporation of water and used where hot flue gases shall be cooled to a level which is not harmful for subsequent equipment anymore.

The Hot Gas Quench Systems are predominantly used in harsh environments, where, besides the temperature aspect, the feed gas also has a very corrosive nature. Therefore, GEA´s quench systems are often made of plastic materials, e.g. thermoplastics or glass fibre reinforced plastic.

The Hot Gas Quench Systems can be used for inlet gas volume flows of up to 300,000 m³/h and inlet temperatures of up to 1,300 °C.

Key features of GEA´s Hot Gas Quench System:

  • Quench function directly available (no idle time)
  • Pressure loss free operation
  • Available in various Materials of Construction (MoC)
  • Well suited for highly corrosive media
  • High operational reliability, insensitive to dust/solids
  • Low maintenance design

Working Principle

Working Principle of Hot Gas Quench System
hot-gas-quench-system-2d-working-principle

The gas and the liquid flow in co-current mode through the apparatus. Water is injected in surplus to quench (= rapidly cool) the hot feed gas. The quench system typically comprises of three nozzle layers, from top downwards: 

  • 1st layer: Tangential nozzles: Form a liquid wall film on the inner wall of the apparatus to protect the equipment from thermal damage and fouling by deposition of dust or other components

  • 2nd layer: Flat jet nozzles: Form a liquid spray curtain across the cross-sectional area of the apparatus to carry out the initial quenching and to prevent back-spray of liquid droplets

  • 3rd layer: Main spray nozzles: Are oriented in a 45° angle to the gas flow and spray water into the gas stream (co-currently) to cool the gas to the thermodynamic equilibrium temperature

The thermodynamic equilibrium temperature results from the energy balance of the system. The enthalpy of the hot gas stream entering the system is absorbed by the quench medium. This energy uptake must be compensated, typically, this is by evaporation of water. The temperature of the quench liquid defines the max. partial pressure of water vapor in the gas phase. At the equilibrium temperature of the system the partial pressure of water (and therefore the amount of evaporated water) is just as high that the enthalpy of evaporation covers the energy uptake from the hot feed gases. 

In the event of a malfunction or failure of the nozzle system in case the equipment is made of plastic materials, an emergency water system is used to provide the nozzle system with water to ensure that the liquid wall film and the quenching function is maintained in order to protect downstream-arranged equipment against thermal damage. 

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