Reverse Jet Scrubbing Technology
The MECS® DynaWave® Reverse Jet Scrubber Technology is the only wet scrubbing technology that accomplishes multiple functions in one vessel and can use a variety of reagents to guarantee low emissions for a wide range of industries. Its unique flexibility is due to specific technical features that provide exceptionally high on-stream reliability and outstanding operational comfort while at the same time making it possible to optimize CAPEX and OPEX expenditures.
DuPont Clean Technologies has more than 40 years of emission control expertise and over 500 successful wet gas scrubber references around the globe. More than 400 of these references were designed with the MECS® DynaWave® Reverse Jet Scrubber Technology. Its distinctive design and many benefits help to reduce air emissions and increase efficiency and cost-effectiveness in refineries, sulfur plants, sulfuric acid plants, metallurgical plants, power, cement kilns, waste incinerators and many other applications.
DynaWave® Reverse Jet Scrubbing is our preeminent solution for reliable compliance with increasingly stringent air pollution control requirements. It combines acid gas absorption, particulate removal and hot gas quenching— all in one vessel. In many conventional scrubbers or simple caustic scrubbers, each function occurs in a different area of the vessel, or outside the scrubber altogether. With DynaWave® technology, even oxidation is achieved in situ in the same vessel sump. No other scrubber is capable of this performance. Our straightforward approach reduces both capital and operating costs. Most importantly, it allows for minimal equipment inside the vessel, making the DynaWave® scrubber an extremely reliable and low-maintenance scrubber.
Our engineering experts can customize DynaWave® solutions for your specific application needs, as we’ve already done for many industries. Major companies in several high-demanding industries currently depend on DynaWave® technology to meet their clean air requirements.
DynaWave® Reverse Jet Scrubbers offer numerous benefits over conventional wet gas scrubbers:
- Guaranteed low SO2 outlet from the stack at all times.
- High on-stream reliability
- Simple operation, low maintenance and little operator attention required
- Virtually unpluggable, with large, open-bore liquid injectors and nonrestrictive, open vessels
- Small footprint
Key Technical Features of the MECS® DynaWave® Reverse Jet Scrubbing Technology
The DynaWave® reverse jet technology is an airborne emission control technology. It is a wet scrubbing process with some unique features:
1. Multiple functions are combined in one unit:
- Hot gas quenching – DynaWave® scrubbers can handle inlet temperatures up to 1200°C (2200°F), offering extra operational comfort and reliability.
- Acid absorption – the guaranteed low acid emission levels often translate into lower stack height requirements and thus CAPEX savings.
- Particulates removal – the large nozzles and open vessel design make the unit virtually unpluggable and able to handle high solid levels. This results in higher on-stream time and lower maintenance and operational expenditures.
- In-situ oxidation – The Chemical Oxidation Demand (COD) is reduced, so that the effluent is completely converted into sulfates, making further treatment of the effluent easier.
- The combination of these functions into one vessel allows for a smaller footprint, a lower CAPEX involvement and increased operational comfort.
2. Liquid is injected countercurrent to the gas, creating the “froth zone” in an inlet barrel upstream of the separation vessel. This enables:
- A high liquid to gas ratio, which results in the capability to handle high inlet acid levels and to large turndown on acid removal. This flexibility, both in terms of variable flow and changing acid concentrations, adds to the ease of operation and the system’s on-stream time.
- The use of high alloy material is limited to the inlet barrel, thus saving on investment cost.
- No requirement for packing sections, resulting in lower height and smaller diameter of the vessel, which translates into lower equipment cost. It furthermore increases equipment reliability in case of particulate entrainment, as there is no blocking potential.
3. DynaWave® technology can work with a variety of reagents including:
Caustic scrubbing, lime(stone) scrubbing, Ammonia scrubbing, Peroxide scrubbing, Magnesium Hydroxide, Zinc Oxide, Seawater and many others and can therefore generate different kinds of solid/liquid effluent/byproduct, depending on site specific convenience. This can be key to optimizing operational costs.
4. Minimal control instrumentation for simple and reliable operation.
How the DynaWave® Wet Gas Scrubber Works
The key is the intimate mixing of the gas and scrubbing liquid in the inlet barrel. The DynaWave® reverse jet scrubber is an open duct in which scrubbing liquid is injected, through a non-restrictive reverse jet nozzle, counter current to the dirty inlet gas.
Gas enters at the top of the vessel and travels down the inlet barrel while the liquid is sprayed upward into the barrel. The liquid collides with the down-flowing gas to create the “Froth Zone,” a region of extreme turbulence with a high rate of mass transfer.
The clean, water saturated gas continues through the scrubber vessel to mist removal devices. The liquid reverses direction and returns to the vessel sump for recycling back to the reverse jet nozzle.
See a short movie clip of how DynaWave® technology works:
Industry applications of DynaWave® Reverse Jet Scrubbing technology
DynaWave® Technology has been used to clean small gas flows from a couple of cubic meters per minute to flows well above one million cubic meters per hours. It has treated gases up to 1200°C (2200°F). It has removed dust, acid gases (such as SO2, HCl, HBr, HI, H2S, HCN) and ammonia with all kinds of different reagents (caustic, limestone in Australia & the USA, milk of lime, ZnO in Australia and Belgium, soda ash, etc.).
some of the most common applications
- Titanium Dioxide Production Units: The DynaWave® solutions offered to the TiO2 industry are based on more than 30 years of experience in difficult applications. In fact, the DynaWave® technology was originally invented by DuPont for the TiO2 industry!
- Storage tank vapors (Read how the DynaWave® technology has been used to treat storage tank vapors)
- Waste incineration
- Catalyst recovery
- Ammonium-bisulfite and/or ammonium sulfate production
- Sulfonation plant (production of mineral oil, basis for a lot of cosmetics)
- Soil remediation
- and many other industrial applications