Enhancing Process Efficiency and Safety

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Today, I'd like to introduce you to a pivotal product in the industrial arena - Demister Pads. While it might not be a household name, Demister Pads play an indispensable role in various applications, significantly impacting process efficiency and safety.

What is a Demister Pad?

A Demister Pad, also known as a mist eliminator, is a finely engineered device typically made from metal wire mesh or glass fiber fabric. Its primary function is to remove liquid droplets or solid particles from gases or vapors, ensuring purity and safety in industrial processes.

Applications Across Industries

Demister Pads find widespread utility across multiple industrial sectors, including but not limited to:

1. Chemical Industry: In chemical processes, Demister Pads separate liquid droplets and particles, ensuring smooth operation of reactors and separators and reducing the risk of environmental contamination.
2. Oil and Gas: In refining and gas processing, Demister Pads aid in the separation of gas and liquid, improving product purity and quality.
3. Power Generation: In power plants, both thermal and nuclear, Demister Pads assist in capturing particulate matter from gases, reducing air pollution.
4. Food and Beverage: In the food industry, Demister Pads remove droplets from steam during food processing, ensuring product quality and safety.

Advantages of Demister Pads

Why are Demister Pads so crucial? They offer several key advantages:

• Efficiency: Demister Pads efficiently separate droplets and particles, enhancing process efficiency.
• Safety: They aid in reducing emissions of hazardous substances, safeguarding worker health and environmental well-being.
• Customizability: Demister Pads can be tailored to suit the unique requirements of various applications, ensuring optimal performance.

In essence, Demister Pads are unsung heroes in the industrial landscape, silently ensuring the integrity, purity, and safety of numerous processes. The next time you witness a clear stack emitting from a chemical plant or savor a perfectly processed food product, remember that Demister Pads likely played a crucial role.

I invite you to explore the world of Demister Pads further. If you have any questions or insights to share on this remarkable technology or its applications, please feel free to connect.

Thank you for your continued engagement and support!

Warm Regards,

Looper

Demister Pad - Maintenance, Classification and Specification

Profiles, Working Principle and Features of Demister Pad

Demister Pad, also called mist pad, wire mesh demister, mesh mist eliminator, catching mist, mist eliminator, is used in gas entrained mist separation columns to guarantee filtering efficiency.

History of Demister Pad

In the late fifties, a foreign apparatus made from special wrinkle woven mesh was used to remove tiny liquid foam inclusions in gas. It was found to be highly efficient with minimal resistance, unmatched by other gas-liquid separation devices, leading to widespread acceptance and application.

In China, the wire demister standard was formulated by the Ministry of Chemical Industry on December 20, 1982. The Shanghai municipal government standards Q/YSZZ-88-91 were implemented in 1991 and fully adopted the national HG/T21618-1998 standard in 1998. New standard demisters are divided into HG5-1404-81 riser type, HG5-1405-81 necking type, and HG5-1406-81 full bore wire mesh device.

Demister pads are commonly placed at the top of the packing tower. They ensure mass transfer efficiency and reduce board spacing. They are widely used in chemical, petroleum, pharmaceutical, light industry, metallurgy, and other industrial production, including vertical cylindrical equipment vapor-liquid separation devices. They can also be used to remove oil mist, toxic, and poisonous gas in desulfurization and other productions.

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Working Principle of Demister Pad

When gas with mist rises at a constant speed and passes through the wire mesh, the rising mist collides with the mesh filament and attaches to its surface due to inertia. The mist diffuses on the filament surface, and droplets form and follow along the filaments to the wire intersection. The droplet grows larger and separates from the filament when its gravity exceeds the gas's rising force and liquid surface tension force, with minimal gas passing through the demister pad.

Separating the gas in droplets improves operating conditions, optimizes process indicators, reduces equipment corrosion, extends equipment life, increases processing amounts, recovers valuable materials, protects the environment, and decreases air pollution.

Features of Demister Pad

• Simple structure
• Lightweight and easy to transport
• High porosity and less pressure drops
• Large surface area and high separating efficiency
• Easy to install, operate, and maintain
• Durable and long service life
• Corrosion and rust resistance

Selected Wire Mesh Form of Demister Pad and Domestic Standards

Selected Wire Mesh Form

Selected demister pad forms fall into four categories: standard type, efficient type, high penetration type, and shock absorber type.

Specifications of Standard Type Demister Pad

Note: every 100 mm thick mat has 25 layers wire mesh.

Specifications of Efficient Type Demister Pad

Note: every 100 mm thick mat has 32 layers wire mesh.

Specifications of High-Penetration Type Demister Pad

High-penetration type demister pad detail.

Specifications of Shock Absorber Type Demister Pad

Shock absorber type demister pad detail.

Domestic Standards

• HG5-1404(1405, 1406)-81: Standards are divided into the riser-type (1404), necking type (1405) and full bore type (1406). The diameter of demister pads ranges from 300 mm to 6400 mm, with heights of 100 mm and 150 mm. Example: HG5-1406-81-11, 304 refers to the 304 stainless steel of grating and wire mesh, full bore coat type, 1600 mm diameter, 100 mm height demister pad.

HG/T 21618-1998: This standard merges riser type, reducing necking type and full bore type installation forms. It divides network types into SP, HP, DP, and HR and expands material types.

Example: HG/T 21618 wire mesh demister S1600-100 SP 304 indicates 304 stainless steel of gratings and wire mesh, coat type, 1600 mm diameter, 100 mm height, SP screen demister grid.

HG/T 21586-98 (Drawer Mesh Demister Device): This standard is appropriate for demister elements that require frequent replacement or cleaning. The nominal diameter ranges from DN 30 mm to DN 5000 mm. Example: HG/T 21586.11-98 WME 1600-100 NS-80/Q235-A refers to the wire mesh using NS-80 carbon steel grill, 1600 mm in diameter, 100 mm in height drawer type demister pad.

Other Non-Standard Wire Mesh Demisters: These include wavelike type, embedded type, external loading type, SWD1 type, square, rectangular, and irregular shapes.

Using Method of Demisters

Mesh Pad Installation

Wire mesh demister pads can be disk-shaped or bar-type. Depending on the usage condition, they can be divided into upload type and download type. If the opening is located above the demister pad or there is no opening but has a flange, use the upload type. If the opening is below the demister pad, use the download type.

Maintenance of Demister Pad

After prolonged use, demister pads may clog or experience flooding, leading to increased pressure drop. This is due to particles in the gas blocking the demister pad. Thus, proper and regular maintenance is necessary.

Maintenance method: Clean the demister pad. Dilute acid on the demister pad shortens its service life, so it's advisable to keep the demister pad in a natural state or under sunlight.

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