High temperature resistant P84 cloth bag

P84 bag is a filter bag made of polyimide (P84) fiber as the core, with continuous temperature resistance of 240 ℃ and instantaneous temperature resistance of 260 ℃. The cross-section of the three leaf shaped fiber brings a specific surface area, and the filtration efficiency is ≥ 89. It is suitable for high temperature, high dust and high corrosion conditions of 200-260 ℃, and is a filter material with ultra-low emissions and hazardous waste/garbage incineration.

Core Structure and Process

Main body of filter material

Substrate: P84 fiber needle punched felt (500-600g/㎡), with PTFE commonly used as the base fabric to enhance strength; Equipped with PTFE microporous film (pore size 0.1-1 μ m), it improves efficiency and dust cleaning performance.

Post treatment: High temperature setting at 220 ℃ for 60 minutes to prevent shrinkage (thermal shrinkage rate ≤ 2%), PTFE impregnation/calendering to enhance and reduce viscosity, optional options include singeing, calendering, and blending.

Sewing: Double stitching with PTFE thread, stainless steel elastic expansion ring at the bag opening, double-layer reinforcement at the bag bottom, and longitudinal reinforcement to prevent tearing.

Adaptive skeleton

Conventional: Low carbon steel+silicon coating (resistant to 260 ℃), 8-16 longitudinal bars, wire diameter 3.2-3.8mm, corrosion-resistant and anti adhesive.

High corrosion: stainless steel+PTFE coating, suitable for high humidity and high acidity conditions such as garbage incineration/hazardous waste disposal.

Key performance parameters (typical values)

Core adaptation conditions

Cement kiln tail: 230-260 ℃ high-temperature flue gas, intercepting dust, ultra-low emissions.

Garbage/hazardous waste incineration: high humidity and high acidity flue gas at 200-240 ℃, capturing dioxins and heavy metals.

Steel smelting: sintering head/tail, blast furnace gas purification, resistance to high temperature and dust wear.

Coal fired boiler: sulfur-containing flue gas in the medium and high temperature range (180-220 ℃), suitable for semi dry desulfurization conditions.

Key selection points

Weight: Conventional 500-550g/㎡, 600g/㎡ is selected for high grinding and cutting conditions.

Base fabric: High humidity and high acidity PTFE base fabric is selected to enhance hydrolysis resistance and strength.

Post processing: PTFE coating+for high viscosity dust; Selection of operating conditions after low and low temperature economizer.

Avoiding pitfalls: Long term overheating (>240 ℃) and high oxygen (>8%) are strictly prohibited, otherwise the filter bag is prone to brittleness and fracture.

Installation, maintenance, and lifespan improvement

Installation: The skeleton is free of burrs and the coating is not damaged. The gap between the filter bag and the skeleton is 2-5mm, and the bag mouth is sealed in place to avoid air leakage and wear.

Dust cleaning: pressure 0.2-0.4MPa, frequency adjusted according to pressure difference (800-1200Pa) to avoid excessive dust cleaning damaging the filter material.

Maintenance: Regularly check the flue gas temperature, oxygen content, and SO ₂ concentration, and adjust operating parameters in a timely manner if they exceed the threshold; Check for damaged or stuck filter bags when there is a sudden change in pressure difference.