Basic Knowledge of Insulated Doors: Cold and Hot Air Sealing

One: Uses and Advantages of Insulated Cold and Hot Air Doors

The Cold and Hot Air Isolation Doors are primarily used for reliable isolation of various auxiliary equipment in boiler flue gas duct systems, such as blower, primary blower, booster blower, coal mill, induced draft fan, etc. Over the years, there has been an increasing number of forced shutdowns at power plants due to issues like poor sealing of isolation doors, accumulation of ash causing jams, and inoperable switches in high temperatures. This plant's isolation doors, designed to address key issues like high temperatures and ash accumulation, offer reliable operation, flexible opening and closing, and tight sealing. They fundamentally resolve the previous shortcomings of insufficient sealing and prolonged closing times, greatly facilitating equipment switching and maintenance shutdowns.

Section II: Technical Specifications of Cold and Hot Air Sealed Doors

The wind door thickness is generally 500mm.

Medium: Cold and Hot Air

3. Operation Time: Less than 4.7 minutes for wind gate widths less than 1 meter; less than 5.6 minutes for wind gate widths less than 2 meters; less than 7 minutes for wind gate widths less than 3 meters.

4. Electric Locking Time: <45s; Pneumatic Locking Time: <4s

Section 3: Key Features of Cold and Hot Air Isolation Doors

1: Unlock flexibility and reliability, with the entire door opening controlled within 50 seconds during emergencies or accidents.

2: Installations can be performed in horizontal, vertical, and upright positions based on the on-site conditions.

3: Fully automated electric (or mechanical) transmission operation (with manual option), capable of remote operation.

Based on the site space and smoke and air channels, the cross-sectional size can be opened and closed on one side or both sides.

The inclusion of a blowing device on dust-containing flue ducts allows for continuous blowing of the sealing surfaces, thereby reducing maintenance and failure rates.

Four: Range of Cold and Hot Air Isolation Doors Supply

Door blade body

2. Electric Actuator (Pneumatic for Cylinder)

3. Locking Actuator

4. Control cabinet

Section 5: Instructions for Ordering Insulated Cold and Hot Air Doors

Offering air duct cross-sectional size specifications.

2. Installation Method: Horizontal or vertical installation. The door body is water-filled for upward and downward flow of steam within the pipe; the door body is vertically installed for horizontal flow of steam within the pipe.

3. Shutting and opening types and schedules.

4. Provide medium name, pressure, temperature, and indicate the presence of fly ash.

Primary Materials and Key Features of Insulation Fire Doors

The air duct contains sulfur dioxide, which is prone to corrosion. The door is designed and manufactured using 316L material, and corrosion-resistant coatings are applied to the baffles, enhancing the temperature and corrosion resistance of the desulfurization baffle door. This results in superior mechanical properties and an extended service life.

The desulfurization dam door panels are designed as double-layer 316L steel plates, with reinforced channels between the layers. Each single layer is 5mm thick, resulting in a total thickness of 60mm for the desulfurization dam door. The shaft heads, bearings, sleeves, and shafts of the desulfurization dam door are made from various materials that are heat-resistant, wear-resistant, and corrosion-resistant.

The electric device is integrated with the wind door shaft without gaps, achieving a leakage rate of less than 0.1% after closure. The electric device is equipped with a multi-functional limit device, ensuring accurate and precise switching.

II. Characteristics of Desulfurization Damper Doors

The distribution cabinet is equipped with a DCS interface, achieving automated operation effects.

2. Adaptable, isolating, flexible adjustments, and excellent isolation performance

3. Smooth switching without binding or sticking, no internal or external leakage, and good shaft sealing.

4. High level of automation with remote, short-range, and manual operation capabilities

5. Manufacturing processes comply with relevant industry standards.

6. The desulfurization damper door bodies are made of 316L material and coated with anti-corrosion materials (epoxy resin), which makes the air door more resistant to temperature and corrosion, with improved mechanical properties and a longer service life.