Dust-purification-techniques
Venturi scrubber | |
| Venturi scrubber excist from a narrowing entrance, the neck (the narrowest part of the venturi tube) and the diffuser nozzle. The dust/gas mixture flows though the venturi tube and reaches in the neck at the highest speed. Afterwards the mixture comes in the diffuser nozzle in which reduces the gas speed. The fluid is added in or in front of the neck to the gas flow. In the neck of the venturi tube a intensive mixing take place between gas and fluid. |
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| Trough the high speed of gas and fluid the water falls apart into fine water drops. The venturi scrubber themselves have a small volume. The total dimension of the installation is especially stipulated by the demister, those sometimes can be than larger then a scrubber. Venturi scrubbers can be applied for removing small particles (< 1 µm) from the gas flow. They can be used however also for larger particles, although the energy usage is then relatively high. Even at very high pressure drop some dust types are not separable. Some venturi's have the advantage that the neck in average can vary and that this way the separator at a varying flow can be adapted to continue preserve a high efficiency.
The disadvantages are:
The venturi scrubber are also used as a cooler for hot degasses (to 1,000 °C) at "quenching".
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