Introduction of negative pressure backflush filter bag dust collector

Release time:04-04-2019
Abstract:

Negative pressure backflush filter bag dust collector N […]

Negative pressure backflush filter bag dust collector
Negative pressure back-blowing filter bag dust collector to control industrial boiler exhaust gas pollution. Practice shows that the filter bag filter has the advantages of low investment, small floor space, large filtration area, stable working performance, high purification efficiency, reliable use, and easy to use dry waste dust for comprehensive utilization, which effectively protects the environment and is a good performance. A highly efficient dust removal device that meets the requirements of current environmental protection laws.
In order to effectively control the boiler exhaust gas pollution, the plant comprehensively researched the filter bag dust removal technology, combined with the horizontal quick-loading chain grate boiler, the operation characteristics, and according to the production requirements and site conditions, the furnace design should be designed by itself. The pressure backflush filter bag dust collector is installed in the negative pressure zone of the boiler draft fan, and the induced draft fan is used to form the negative pressure of the dust collector system, and the medium alkaline glass fiber filter material is used to resist the corrosion of SO2 in the flue gas.
The negative pressure back-flush bag filter has fundamentally controlled the pollution, and the smoke emission concentration after purification is significantly lower than the national standard.
Schematic diagram of the vacuum backflush filter bag.
1—air inlet; 2—motor; 3—screw conveyor; 4—pool dust port; 5——air flow manifold; 6——dust bucket; 7——filter room; 8——dust filter bag; - Flower board; 10 - air outlet.
The boiler adopts Y5-48-6.37 centrifugal induced draft fan, the flow rate is 12350m3/h, the pressure is 3942Pa, the rotational speed is 2900r/min, and the power is 22kW.

It is used as the air-inducing device of the negative pressure blowback filter bag filter of the boiler. In order to ensure that the filter bag dust collector works normally under the condition that the boiler is not stopped, or the filter bag cleaning operation is carried out, the dust collectors are grouped into three independent dust filter rooms. 22 filter bags are installed in each room. The filter bags can be grouped or operated in parallel. When one group of filter bags is cleaned, other group filter bags will keep working normally. The flue gas enters from the lower inlet of the dust collector, the flue gas moves forward along the negative pressure air passage in the dust collector, and some dust particles settle in the dust collecting bucket due to gravity; when another part of the flue gas passes through the filter bag, the smoke is It is retained in the filter bag, and the purified gas is discharged to the outside through the induced draft fan, thereby achieving the purpose of collecting dust, purifying gas and protecting the atmosphere.
Purification mechanism of negative pressure back-blowing filter bag dust collector: It uses the boiler induced draft fan to form the negative pressure of the dust collector system, and the flue gas flows negatively. The filter bag dust collector has the functions of inertial collision, sieve filtration (contact retention), interception, aggregation and static electricity, and can be used for coarse (≥10μm particle size), fine (<5μm particle size is the most harmful to human body) particles. The dust and suspended dust can be effectively captured, which is its outstanding advantage.
The filter bag is cleaned, and after the dust collector is operated for a period of time, the surface of the filter bag adheres and gathers a certain thickness of smoke, and the surface of the bag is removed by controlling the backflushing valve.
The filter bag dust collector is located in the negative pressure zone of the induced draft fan, which makes the dust removal system work under negative pressure condition, which is beneficial to prolong the service life of the induced draft fan and avoid being worn by the dust. In order to ensure the normal operation of the filter bag, the bypass flue and the valve are also provided for the boiler to be repaired and the furnace is used for ignition and the use of fuel containing more soot is applied to the filter bag for temporary use.
The negative pressure back-blowing filter bag dust collector has a simple structure and a small footprint (within 30m2), and can be flexibly designed and arranged according to production needs.
The negative pressure back-blowing filter bag dust collector has strong ability to purify dusty gas and can effectively control pollution. Especially after purification, the smoke dust emission concentration is significantly lower than the national emission standard. It can be applied to small and medium-sized industrial boilers, and the dust removal efficiency can reach 98%. the above.
Negative pressure backflush filter bag dust collectors have lower operating costs and lower energy consumption compared to similar technologies.
The negative pressure back-blowing filter bag dust collector can effectively capture the dust and suspended dust that is harmful to the human body with ≥10μm particle size and <5μm particle size, which plays a special role in purifying the atmospheric environment and protecting human health.

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