Cooling & Quenching
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.
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:
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.
Used in industrial applications to cool gases upstream of electrostatic precipitators / bag filters for effective temperature control, gas volume reduction and humidification by the evaporation of water. GEA provides the two available atomization technologies utilized in the evaporative cooling process: hydraulic atomization and twin-fluid atomiz...
Vertical tube with a gas inlet from underneath and a radial task of the scrubbing liquid from above over the whole tube cross section.
Rapid cooling of quenching of gas streams is used in a number of essential applications in the process industries. The selection and sizing of spray nozzles are the most critical decisions in the system design. GEA quench tower design consists of an open vessel in which liquid is sprayed to contact the gas. The gas enters the bottom of the tower...
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