Chemical reaction processes often require the simultaneous addition of several liquids into a reactor in the finest drops possible. In many processes, atomisation of the liquids using a gas or steam is not possible. Schlick pressure-mix nozzles allow fine atomisation of up to three liquids without the need to use any additional gas in the system. The size of the drops depends on the pressure and properties of the chemical media. Generally, the higher the liquid pressure, the finer the drops. Pressure-mix nozzles are available that either use the internal mixing principle or the external mixing principle.
With internal-mix nozzles, the media are pressurised and meet together in a mixing chamber. The liquid mixture is then fed towards the nozzle exit via a swirl chamber, where it turns into very fine drops. This produces a hollow-cone spraying pattern. With external-mix nozzles, the pressurised media are fed through the nozzle separately, and only meet upon leaving the nozzle exit. Individual spraying cones are produced through concentrically arranged channels, and these mix together upon leaving the nozzle. The liquid droplets of each media come into contact with each other and the desired reaction takes place. This principle allows the reaction between the media to be relocated so that it takes place at the nozzle exit. No residues are left from the reaction products, so the nozzle does not get clogged up. The pressure-mix nozzles are individually adapted to the flow rate, design and material requirements of each application.
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