First, the difference between filter materials and principles
1. The filter cartridge or filter bag hard filter material is folded to form a cylinder, without skeleton, short, large spacing between cylinders, thorough cleaning, no secondary pollution.
2. The bag is sewed into a filter bag with a soft filter material, and is placed on the skeleton welded by the steel bar (commonly known as the dragon skeleton). The filter bag is densely packed, and the filter material is long polyester fiber and its post-treatment material is mostly single layer. Ordinary industrial polyester fabric.
3, the principle of filtration surface filtration principle: filter cartridge dust collector dust does not go deep into the filter material deep filtration principle. The dust of the bag filter goes deep into the filter material, and the dust layer is built on the outer surface of the filter material to maintain the dust removal efficiency.
Second, the main performance comparison
1. Filter cartridge dust collector: filter material characteristics
project | Filter cartridge dust collector | Baghouse |
Filter material characteristics | Anti-condensation, good gas permeability, ultra-fine powder, fiber dust are not easy to pass | Rough filter material, easy to stick dust, poor gas permeability, ultra-fine powder, fiber dust are not easy to pass |
Dust removal efficiency | Dust removal efficiency is as high as 99.7%-99.9%, stable work, can reduce emission concentration, is conducive to the control of total emissions, suitable for high concentration conditions. | The dust removal efficiency is not as high as 99%-99.5% of the filter cartridge, which is unfavorable for controlling the emission concentration and total emissions, and is not suitable for high concentration conditions. |
Dust collector resistance | Low resistance, general dust 1500PA | Resistance is high, generally dust 1500PA is sometimes higher |
Backflush system compressed air | Large blown back, uniform, good effect | The blowback force of the fan is small, because the filter bag is long and the backflush is uneven, and the effect is poor. When the filter wind speed of the dust exceeds 1 m/min, the dust cannot be blown. |
Air leakage rate | Low equipment opening, air leakage rate less than 4% | More equipment openings, air leakage rate of 5%, or even higher |
Dimensions and weight | The installation and assembly have small size, light weight and unit combination, and can be combined with a group of fans. The upper part of the precipitator has no working surface and is easy to install and takes up little space. | Large and bulky, it is a single device, the main fan is a spare part, the installation takes up a large space, and the upper part must have 3M high pumping space. |
Equipment maintenance and management, service life | There are no moving parts on the main body of the device, and there is no maintenance work. The filter cartridge has no mechanical wear during the continuous exchange of work and backflushing, and has a long service life, sometimes for several years. The filter cartridge does not require any tools and is easy to assemble and disassemble. | There are several mechanical moving parts such as anti-dryer, swivel arm and pulsating valve at the top, which is easy to damage for many years. Filtering and the skeleton absorb and absorb the drum during work and backflushing, continuously rubbing, damage the filter material seriously, change the filter bag cumbersome, costly and laborious and produce secondary pollution. |
Third, the economic comparison
project | Filter cartridge dust collector | Baghouse |
One-time investment equipment fee | Advanced product performance and high production cost. However, the price is the same as the old one, and some specifications are cheaper and 1/4 of the price of imported products. | The price is the same as the new equipment, but the matching is not complete, there are no spare parts, the air leakage rate is large, the fan size is large, the main fan is the spare parts, and the pipeline cost is increased. |
Supporting civil, electrical and compressed air equipment | The dust collector is light in weight, small in size, low in civil construction cost, low in compressed air consumption, low in requirements, and low in investment in compressed air equipment. | The dust collector is heavy in weight, large in volume, high in civil construction cost, high in electricity consumption of equipment, high in electrical engineering costs, large in compressed air, high in pressure, and increased civil and electrical costs for air compressor equipment and supporting equipment. |
Maintenance costs | It is not necessary to change the filter cartridge under normal working conditions, and there is no need to stop production when replacing the filter cartridge. | The maintenance cost is higher in the later period, the filter bag must be replaced frequently, and the cost is high. When the filter bag is replaced, the operation should be stopped. |
Energy consumption | Main fan: The dust collector has low resistance, small air leakage rate, air consumption, small wind pressure and low power consumption. Backflushing system: The amount of compressed air used is small, requiring low pressure and low power consumption. | Main fan: The dust collector has large resistance, large air leakage rate, air consumption, large wind pressure and high power consumption. Backflushing system: The anti-hair dryer and the swing arm are all power-consuming devices, which consume large amounts of power. |
to sum up | Pulse filter cartridge dust collector features: 1, pleated filter cartridge, increase the filtration area 2, improve the processing air volume 3, reduce the filtering wind speed 4, easy to clean the ash, reduce the pressure difference 5, save compressed air 6, easy to install and maintain 7, dust removal efficiency of up to 99.99% | Advantages of the pulse bag filter after the transformation: 1. The filtering area is increased by 3 to 5 times, and the filtering wind speed is greatly reduced. 2, dust removal efficiency increased to 99.99% 3. The filter cartridge has a short length and a large excess space, which is conducive to dust deposition. 4, the life of the filter cartridge is extended 5, the venturi tube, cage all exempted 6, the filter components are short and small, easy to install (top loading) easy to repair and replace |
Fourth, their respective advantages and disadvantages
1. Advantages of the filter cartridge type dust collector:
Three new: new filter material (waterproof, moisture-proof, anti-wear and anti-corrosion), new structure (hard filter material folding arrangement, no steel frame, no filter material wear phenomenon), new theory (surface filtration instead of deep filter dust, no penetration and filtration Inside the material). The backward dust collectors, such as back-flushing, air box pulse blowing, and mechanical vibrating units, have been eliminated by the United States, Germany, Australia and other countries for many years. Filter cartridge dust collectors are the replacement for these old dust collectors. The advantages are as follows:
1) The dust removal efficiency of the filter on the surface of the filter cartridge is much higher than that of the old dust collector, which greatly reduces the emission of harmful substances. The air purification index has reached the world advanced level, completely changing the backwardness of the old dust collector. status.
2) The filter cartridge type dust collector has no filter material wear phenomenon, and there is no movable part on the body, which can be used for a long time without maintenance (even if the filter cartridge is removed), which avoids the trouble of changing the filter material of the old type dust collector, Money saves time and effort and no secondary pollution.
3) The filter cartridge type dust collector is much smaller than the old dust collector of the same specification, saving civil construction space and civil construction load, and saving significant capital investment.
4) The filter cartridge type dust collector has low resistance, consumes a small amount of compressed air, and has no maintenance workload. More energy than other types of old dust collectors, saving more than 30%, any enterprise can not ignore the significant economic benefits brought by this energy-saving effect.
2, the advantages of bag filter:
1) It has the characteristics of simple operation, continuous cleaning, stable resistance, high filtration speed, no moving parts inside, simple design, etc. It is a high-performance bag filter.
2) High dust removal efficiency, it can capture dust above 0.3UM, and purify dusty gas to 15mg/m3 or even below.
3) There are few auxiliary equipments, investment is saved, and technical requirements are not as high as electrostatic precipitators.
4) It can collect dust that is difficult to recover by electric dust removal, and can collect compounds such as nitrates and sulfides to a certain extent.
5) It has good adaptability to load changes, especially suitable for collecting fine and dry dust, and the collected dry dust is easy to handle and recycle.
6) The bag filter is safe to collect when it contains explosion hazard or spark-containing dust.
3. Disadvantages of bag filter:
1) For different types of gas, the corresponding type of cloth bag should be selected, and the cloth bag needs to be replaced frequently, and the bag consumption is large.
2) When collecting dusty gas with high humidity, moisturizing measures should be taken to avoid the “binder bag†caused by condensation. Therefore, the bag filter has certain requirements on the humidity of the gas.
3) The resistance is large, and the general pressure loss is 1000-1500PA.
4) For high temperature gases, cooling measures must be taken.
5) When receiving dusty gas with a large particle diameter, the bag is more likely to wear.
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