Combination of cyclone dust removal and bag dust removal

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 1、 Working principle of combination

Primary treatment (cyclone dust removal)

The dusty gas enters the cyclone dust collector at a tangential velocity of 18-28m/s. Under the action of centrifugal force, large particle dust (>10 μ m) is thrown towards the cylinder wall and falls into the ash hopper, which can remove 80% -90% of large particle dust.

 This stage can effectively reduce the dust load of subsequent bag filters and minimize filter bag wear.

 

Deep purification (bag dust removal)

The pre treated dusty gas enters the bag filter, and fine dust (0.1-5 μ m) is captured by the interception, inertial collision, and diffusion of the filter bag. The filtration efficiency reaches over 99.9%, and the emission concentration can be controlled at 5-30mg/m ³ 45.

 The intelligent pulse dust cleaning system automatically removes the accumulated dust on the filter bag and maintains low pressure differential operation.

 

Comparison of key parameters

 

Equipment type Processing particle range Dust removal efficiency Operating resistance

Cyclone dust collector>10 μ m 80% -90% ≤ 500Pa

Bag filter 0.1-5 μ m>99.5% 800-1500Pa

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 2、 Core technological advantages

Extend equipment lifespan

 

The cyclone dust collector intercepts large particles, reduces bag wear, and extends the life of filter bags by more than 40%;

After pretreatment, the dust concentration decreased, the frequency of bag cleaning decreased by 30%, and the consumption of compressed air decreased by 3.

Improve overall efficiency

The combined system has a capture efficiency of over 99.2% for PM2.5, which is much higher than that of a single device (such as a single cyclone dust collector with an efficiency of only 60% for particles<5 μ m).

 A typical case is when the emission concentration of biomass boilers is reduced to below mg/m ³ after renovation.

 

Economic optimization

 

Reduce the selection air volume of bag filter and save equipment investment;

Maintenance cost reduced by% (reducing filter bag replacement frequency and energy consumption)

3、 Typical application scenarios

High temperature and high corrosion environment

 

Regenerated lead smelting: using a combination of "cyclone pre dust removal+high-temperature resistant cloth bag (PPS filter material)", it can withstand lead containing flue gas at 300 ℃, and the lead dust recovery rate exceeds 98%;

Medium frequency furnace flue gas: Cyclone removes melting sparks, bag captures fine lead smoke, with a dust removal rate of 99.9%.

Large particle high concentration dust

 

Cement/steel industry: Cyclone treatment of coarse dust with an initial concentration of 1000g/m ³, followed by bag filtration and emission concentration of 30 [8] [9 [5] [7330 [7] [11<mg/m ³];

Biomass boiler: Multiple cyclone dust collectors connected in series with cloth bags to solve the problem of high humidity straw ash.

Space constrained scenarios

The ceramic multi tube cyclone dust collector has a compact structure and reduces land occupation by% when combined with a bag, making it suitable for renovation projects.

 

Key points of risk control

 

The inlet velocity of the cyclone needs to be controlled between 18-28m/s. If it is too low, it will reduce the centrifugal force, and if it is too high, it will cause secondary dust;

High temperature flue gas (>120 ℃) requires a cooler to be installed in front of the bag to prevent the bag from burning out.

4、 Innovative development trend

Intelligent collaborative control

The PLC system monitors pressure difference and temperature in real time, dynamically adjusts the cyclone air intake and bag pulse frequency, and reduces energy consumption by 15% 1314.

Material upgrade

The cyclone body adopts ceramic lining, which increases the corrosion resistance life by 3 times by 10;

The bag is coated with a nano catalytic layer (such as TiO ₂) to simultaneously degrade VOCs 1415.

Collaborative treatment of multiple pollutants

Expand to a three-level system of "cyclone+bag+wet electricity/desulfurization tower" to achieve integrated removal of dust, SO ₂, and NOx.