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Fouling and Flushing System for Demisters
Release time:
Nov 25,2020
[Summary]The main components of a demister include corrugated sheets, rigid plates, and retaining strips. In processes such as desulfurization, numerous fine mist particles can be generated. These mists contain a large number of water molecules as well as various chemicals, including potassium sulfate and sulfur dioxide. As a result, such mist can cause damage and corrosion to equipment such as blowers, flue gas ducts, and heat exchangers. Therefore, when desulfurization is completed, it’s crucial to pay attention to the demisting function of the equipment and ensure that the emitted gases are thoroughly free of mist.
The main components of a demister include corrugated sheets, rigid plates, and retaining strips. In processes such as desulfurization, numerous fine mist particles can be generated. These mists contain a large number of water molecules as well as various chemicals, including potassium sulfate and sulfur dioxide. As a result, such mist can cause damage and corrosion to equipment like blowers, flue gas ducts, and heat exchangers. Therefore, when desulfurization is complete, it's crucial to ensure that the equipment has effective demisting capabilities and that the emitted gases are thoroughly free of mist. The nozzles used for removing mist must possess exceptional performance and have an exceptionally long service life; thus, they are typically made from high-quality plastics.
If you’re an experienced industrial technician with expertise in desulfurization, you’ll already have such a mist eliminator ready for use during the early stages of industrial production. After all, with this kind of equipment at your disposal, you won’t have to worry about the impact of water mist on the production environment. Although machines of this type are relatively expensive, these professionals still recommend purchasing them—because they ensure that larger equipment remains undamaged by these tiny liquid droplets. In fact, while this water mist may look similar to ordinary steam, the composition of mist encountered in industrial settings is far from simple. Typically, it contains many corrosive substances as well as highly adhesive materials. Therefore, if this mist were allowed to accumulate inside absorption towers, it would inevitably disrupt and compromise the smooth operation of the production process.
Generally speaking, a mist eliminator system consists primarily of control components such as flushing nozzles, a flushing pump, valves, pressure gauges, and piping. It is commonly used for flue gas desulfurization and mist removal from flue gases in steel plants and other similar facilities. This product is offered by mist eliminator manufacturers and finds extensive application.
The demister flushing system can prevent scaling and blockage of the blades and ensure the system operates smoothly. However, in many cases, single-sided flushing cannot thoroughly clean the surface of the demister blades. Therefore, under certain conditions, a single-sided flushing arrangement can be adopted on demisters; yet, to varying degrees, this approach may still pose some potential risks.
We know that when certain mist eliminators are installed inside the absorption tower, we no longer have to worry about the corrosion of various machines and components within the tower caused by corrosive liquid droplets. Nor do we need to fret about these droplets adhering to the tower’s surfaces and clogging the flue ducts or even corroding the fans. Given the critical role this equipment plays, it’s entirely understandable—even if its price is somewhat higher. After all, its function is simply indispensable. Only by using such equipment to remove water mist from the production environment can we protect factory machinery from damage. If the machinery operates normally, it can continue producing goods. Therefore, ensuring the proper functioning of packaging machinery is of utmost importance. That’s precisely why this specialized mist-removal equipment fully fulfills its protective role.
The protection provided by demisters for certain rigid components typically involves two main aspects: First, since the water mist contains corrosive substances, removing these droplets can protect components such as fans and heat exchangers—parts that are prone to corrosion—from damage. Second, the droplets often contain substances with strong adhesion properties; therefore, only by eliminating these substances that easily stick to machine surfaces can we ensure that the surfaces of flue gas ducts and other components remain clean and free from stains or other contaminants. Only in this way can flue gas duct components operate smoothly and efficiently. Here, we recommend stainless steel demisters for their excellent performance.
Therefore, to ensure trouble-free operation, the demister should adopt a double-sided flushing arrangement whenever possible. Among the components of the demister flushing system, the nozzles are critical actuators; solid-cone nozzles are typically used. Under normal circumstances, the nozzle spray angle is usually set within the range of 75° to 90°.
Generally speaking, the larger the spray nozzle's diffusion angle, the greater its spray coverage area will be. Conversely, the smaller the nozzle's diffusion angle, the more nozzles will be required to cover the entire cross-section of the demister. This is an important piece of knowledge that we should keep in mind when using demisters.
The demisting efficiency of a mist eliminator increases with the rise in gas flow velocity. This is because at higher flow rates, the inertial forces acting on the mist droplets are greater, which facilitates the separation of gas and liquid phases. However, increasing the flow velocity also leads to a rise in system resistance and consequently higher energy consumption. Moreover, if the flow velocity is too high, it may cause secondary entrainment of water, thereby reducing the demisting efficiency.
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