Tube bundle demister

The tube bundle demister is mainly used to remove the mist droplets and dust particles carried in the flue gas. It is widely used in the treatment of flue gas at the rear end of the desulfurization tower and is a simple and efficient environmental protection device.

Working principle: When the gas containing mist flows through the demister at a certain speed, due to the inertial impact of the gas, the mist collides with the corrugated plates. The collected droplets are so large that the gravity they generate exceeds the combined force of the upward force of the gas and the surface tension of the liquid, and the droplets separate from the surface of the corrugated plates. The multi - folded structure of the wavy demister plates increases the chance of capturing the mist. The mist that has not been removed will be captured by the same action at the next bend.

Main structure: It includes the tube bundle cylinder, separator, confluence ring, guide ring, as well as nozzles, pipes, etc.

Design parameters: Demisting efficiency, system pressure drop (according to different designs, the overall pressure drop range is wide, and the pressure drop can be controlled in high - efficiency designs), flue gas flow velocity, blade spacing and angle, stage combination, flushing interval, etc.

Particle size of treated mist droplets: It can effectively remove fine - sized mist droplets and dust particles, and has a high collection efficiency for dust particles above PM10. After treatment, the dust concentration can be as low as 5mg/Nm³.

Materials: Polypropylene (PP), FRP (fiberglass reinforced plastic) with a smooth surface and self - lubricating properties; 304, 316L stainless steel, etc., which are used in scenarios with high corrosion - resistance requirements.

Installation position: It is usually arranged above the spray layer of the absorption tower and can directly replace or retrofit the original conventional demisters such as the ridge - type demister.

Advantages: High efficiency in dust and mist removal, relatively controllable system pressure drop, small retrofit workload (especially suitable for retrofit projects), relatively simple operation and maintenance (no moving equipment), and good anti - clogging performance.

Application industries: It is used in the absorption tower of the wet flue gas desulfurization system (WFGD) and is also applied in industrial processes such as petroleum, chemical, and metallurgy that require gas - liquid separation.

The tube bundle demister has the latest design technology:

· Multi - stage synergistic effect: There are usually multi - stage cyclones (or speed - increasing devices, separators) inside it. The flue gas first flows through the primary separator to remove larger mist droplets and particulate matter; then it is accelerated by the speed - increasing device and then enters the secondary separator to remove finer mist droplets and particulate matter. This multi - stage combined design ensures the efficient removal of pollutants of different particle sizes.

· Liquid film control and prevention of secondary entrainment: The confluence ring in the device helps to control the thickness of the liquid film on the inner cylinder wall of each stage, preventing the generation of finer secondary mist droplets under high - speed conditions. The guide ring at the gas outlet can control the gas flow state and effectively prevent the captured droplets from being carried away again by the gas flow (i.e., secondary entrainment).

· Importance of the flushing system: To ensure long - term stable operation and prevent scaling and clogging, the tube bundle demister is usually equipped with a flushing water system (including nozzles, pipes, etc.). Regular or irregular flushing can remove the deposited solid particles and maintain a low operating resistance.

Installation and operation
The tube bundle demister often adopts a modular design, which makes it very flexible in both new construction and retrofit projects.

· For newly built desulfurization units, usually only one layer of support beams needs to be set for installation.

· For retrofit projects, usually only the original demister needs to be removed and the bottom demister girder needs to be retained, and then the tube bundle demister modules can be installed. The retrofit workload is relatively small, and the original absorption tower space can be fully utilized without changing the external structure.

The tube bundle demister works efficiently through mechanisms such as centrifugal separation, inertial collision, and condensation capture. With its advantages of high - efficiency dust and mist removal, convenient retrofit, and relatively simple operation and maintenance, it has become one of the preferred technologies for modern industrial flue gas treatment, especially for meeting the ultra - low emission requirements.

Manufacturing & Production Capacity

After-Sales Service

Haina provides on-site installation, commissioning and technical training.Regular follow-up inspections are arranged after project delivery to support long-term operation stability.