Use of Schmitt centrifugal pumps in gas scrubbers and exhaust gas cleaning
Background to the task
Gas scrubbers are used in many industries to remove pollutants from exhaust gases. For this purpose, the exhaust gas is brought into contact with a scrubbing liquid, which binds the pollutants chemically or physically.
To ensure this process operates reliably, the scrubbing solution must be continuously pumped, distributed and returned. Centrifugal pumps perform the central task of moving the fluid through nozzles, packing and reaction stages, and maintaining stable circulation.
Challenge
- The scrubbing fluids used can be aggressive – from alkaline or acidic solutions to saline, oxidising or chemically reactive fluids.
- Solids often form during operation, e.g. reaction products, sediments or gypsum fractions, which place mechanical stress on the pump.
- Gas scrubbers often operate continuously. High availability of the pump technology is therefore essential.
- The temperature of the fluid can vary, and the system is sensitive to pressure or flow rate fluctuations.
- The pump must suit the installation situation – whether next to a tank, in a sump or directly in the scrubber vessel.
A standard pump is often only partially able to meet these requirements. A stable exhaust gas cleaning process requires robust, chemically resistant and reliable solutions.
Solution
Schmitt centrifugal pumps are designed for precisely this operating environment. Their design and material selection are based on the real requirements of gas scrubbers – from aggressive fluids to scrubbing solutions containing solids.
- Recirculation of the scrubbing liquid In gas scrubbers, the scrubbing solution must be kept in continuous circulation. Schmitt pumps deliver a stable volume flow, even over longer pipe runs or against higher system resistance. This ensures uniform wetting throughout the scrubber.
- Supply of spray and distribution systems Many systems operate with nozzles or atomisers. To function optimally, they must be supplied evenly with fluid. Schmitt pumps generate the required head and reliably keep the pressure constant.
- Handling of contaminated fluids or fluids containing some solids Thanks to the unique plain bearing design with high-quality silicon carbide as standard, which, unlike competing designs, does not require a vulnerable ceramic plug-in axle or shaft, our pumps are also highly suitable for abrasive solid particles in these processes.
With the available designs – horizontal pumps, vertical immersion pumps and self-priming variants – Schmitt pumps can be easily integrated into a wide range of plant layouts. Depending on the fluid, temperature-resistant and chemically resistant materials such as PP, PVDF or stainless steel are used. Schmitt pumps operate reliably in continuous duty, are easy to maintain and ensure stable, uniform operation of the entire gas scrubbing process.
Advantages of Schmitt pumps in gas scrubbers
Materials such as PP, PVDF and stainless steel withstand aggressive washing solutions and increase the service life of the pump.
Schmitt pumps withstand the harsh environment in gas scrubbers – whether pressure fluctuations, temperature changes or varying loads.
Resistant internal components enable the safe handling of highly demanding fluids. Thanks to the unique plain bearing design with high-grade silicon carbide, abrasive solids are not a problem.
The pumps are designed for continuous operation and, with their robust design, reduce unplanned downtime.
High efficiencies help keep operating costs low – an important factor in continuously operating systems. Our NHM series achieves an efficiency of up to 76%.
Whether hot process fluids or aggressive chemical solutions: Schmitt pumps remain reliable.
Horizontal, vertical and self-priming models allow the pumps to be integrated effectively into existing systems.
The design facilitates servicing and reduces maintenance requirements.
Suitable variants are available for system areas with potentially explosive atmospheres.
Schmitt pumps have been an established component of industrial gas scrubbers and other environmental technology systems for decades.
Pumps for gas scrubbers (selection)
- Hermetically sealed, magnetic coupling, PP or PVDF
- Up to 95 °C, flow rate up to 42 m³/h, head up to 27 m
- Up to 76% efficiency: best-in-class energy efficiency
- Sliding shaft technology: wear-free, maintenance-free and durable
- Hermetically sealed by contactless magnetic drive
- Special containment shell geometry for high pressures and temperatures
- EN Hermetically sealed, magnetic drive, PP or PVDF
- Up to 95 °C, flow rate up to 35 m³/h, head up to 32 m
- Extremely proven pump, used in more than 10,000 applications
- Insensitive to insufficient lubrication and partial dry running due to generously dimensioned plain bearings – no plug-in shaft
- Virtually maintenance-free in normal operation due to generously dimensioned plain bearings
Schmitt pumps
Horizontal plastic centrifugal pumps
