A problem with dust emissions from sugar factories is no longer so acute, as it was even a decade ago. One of the main reasons for such positive changes to occur is the increased use of wet air scrubbers for removing dust from boiler flue gas.
There are many advantages of the use of a wet air scrubber. A major and the most beneficial advantage of the scrubbers is an ability to prevent a wide range of pollutants from entering the air through the exhaust gas. In comparison with other air pollution control devices, scrubbers are very multifunctional. They have an ability to remove solids, mists, and gases simultaneously while providing cooling. Scrubbers are also capable of handling explosive and flammable gases safely. Scrubbers are fairly durable and suitable for operation in almost any environment as well because scrubbers can tolerate a wide range of temperatures. In addition to this, wet scrubbers can be used to remove pollutants from mercury to acidic gases that cause acid rains.
On the financial side, wet air scrubbers have a lower initial capital and maintenance cost and better energy savings. Technological studies and innovations show that scrubbers are often one of the cheapest SO2 control options to install and operate, particularly when revenue from byproducts and emission allowances are considered. The newest developments of the scrubbers allow reducing the costs by more than 30 percent. Also, such wet air scrubbers don’t have any internal moving parts. Accordingly, such scrubbers can be less expensive to purchase and operate than any other dust collector even with the added cost of replacement filter bags for a baghouse.
Despite the effectiveness of scrubbers, there are still operational problems with factory crushing rates. This is due to the fact that many wet scrubber installations reduce boiler steam output. Firstly it happens due to blockages that increase the pressure drop across the scrubbers. Secondly, droplet carryover reduces collection efficiency and causes build-up on and wear of the boiler.
The need to improve the structure of scrubbers provided the motivation for further developments in this field. In order to improve understanding of the flow processes occurring in a wet air scrubber and for evaluating of the options for improving their characteristics, the modeling and experiment were applied. Results of this research project include the extended modeling capability with the updated code, the computational fluid dynamics (CFD) modeling and flow visualization result, the scrubber design changes and the test rig and scrubber scale model. Such results promise a new round of popularity for scrubbers: implementation of the recommended changes should lead to increased factory throughput and to reduced emissions from sugar factory boilers.
Multi-vortex wet air scrubber is a new type of wet scrubber, which has a lot of advantages in comparison to conventional wet scrubbers. Multi-vortex wet air scrubber is more compact, economical and eco-friendly than other types of wet air scrubbers. Multi-vortex wet air scrubber produces the cleaning mist differently from other scrubber systems, which results in running costs that are much lower than for a common wet air scrubber. Multi-vortex wet air scrubber cleans air from gases, dust, vapors and other admixtures using water or other cleaning liquid. Multi-vortex wet air scrubber is the new type of wet air scrubber that saves water.
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