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The cartridge dust collector has excellent performance, high efficiency and easy maintenance

Article source: this site Author: admin popularity: second Time: 14:17, December 16, 2019【 large in Small

Cartridge dust collector It has the advantages of small size, high efficiency, low investment and easy maintenance. However, due to its small capacity, it is difficult to combine into large air volume equipment, with low filtering wind speed and narrow application range, it is only used in grain and welding industries, so it has not been widely promoted for many years. In recent years, with the continuous development of new technology and new materials, the structure and filter material of the dust collector have been improved, which makes the filter cartridge dust collector widely used in cement, steel, electric power, food, metallurgy, chemical industry and other industrial fields, and the whole capacity has increased several times and become the filtering area >2000m2 Large scale dust collector( GB6719 eighty-six Compared with the existing bag and electrostatic precipitators in the market, it has the characteristics of large filtering area, low pressure difference, low emission, small volume and long service life Industrial dust collector New direction of development.

Cartridge dust collector The structure of The utility model is composed of an electric control device, an air flow box, a dust collecting device and a dust collecting device.

The arrangement of the filter cartridge in the dust collector is very important. It can be vertically arranged on the flower plate of the box body, or it can be arranged on the flower plate obliquely. From the ash cleaning effect, the vertical arrangement is more reasonable. The lower part of the pattern plate is a filter chamber, and the upper part is an air box pulse chamber. An air distribution plate is arranged at the inlet of the dust collector.

Filter cartridge dust collector working principle: After the dust containing gas enters the ash hopper of the dust collector, due to the sudden expansion of the air flow section and the action of the air distribution plate, a part of the coarse particles in the air flow settle in the ash hopper under the action of dynamic and inertial forces; after the dust particles with fine particle size and small density enter the dust filter chamber, the dust is deposited on the filter material surface through Brownian diffusion and screen filtration, and the purified gas enters the air purification chamber through the exhaust pipe It is discharged by fan.

Cartridge dust collector The resistance of the filter increases with the increase of the thickness of the dust layer on the surface of the filter material. When the resistance reaches a certain specified value, the ash shall be removed. here PLC The program controls the opening and closing of the pulse valve. First, the lifting valve of the first chamber is closed to cut off the filtering air flow. Then, the electromagnetic pulse valve is opened. The compressed air and short time in the upper tank expand rapidly and flow into the filter cartridge, which makes the filter cylinder expand and deform and generate vibration. Under the effect of reverse airflow scouring, the dust attached to the outer surface of the filter bag is stripped and falls into the ash hopper. After the dust cleaning, the electromagnetic pulse valve is closed, the lifting valve is opened, and the filtration state of the chamber is restored. The cleaning of each chamber is carried out in turn, and a cleaning cycle starts from the beginning of the cleaning room to the beginning of the next cleaning. The falling dust falls into the ash hopper and is discharged through the ash unloading valve.

In this process, the filter cartridge should be replaced and cleaned regularly to ensure the filtering effect and accuracy. In addition to being blocked, some dust will deposit on the surface of the filter material, which will increase the resistance. Therefore, the normal correct replacement time is three to five months!

The characteristics of pulse cartridge dust collector are as follows:

one The superfine and submicron fibers of the filter material can be adhered to the surface of the filter cartridge by using the superfine and submicron fibers;

two The filter material is folded to increase the filtering area and make the structure of the dust collector compact;

three The height of the filter cartridge is small, and the installation and maintenance workload is small;

four Compared with the same volume dust remover, the filtering area is relatively large, the filtering wind speed is small, and the resistance is small;

five The on-line cleaning mode of pulse injection is adopted for single dust collector. The cleaning process is automatically controlled by pulse controller. Multiple filter cartridges are set in the dust remover to increase its filtering area. When a certain (pair) filter cartridge meets the dust removal setting requirements, the injection device is started to clean the dust, and other filter cartridges work normally. In this way, the dust removal effect is achieved and the equipment operation is not affected, so that the dust collector can continue to operate. The combined dust remover adopts off-line pulse automatic cycle cleaning in separate chambers. Each dust removal room is equipped with multiple filter cylinders to increase its filtering area. When a filter cylinder in a dust removal room meets the requirements of dust removal setting, the injection device is started to clean the dust, and other dust removal rooms work normally. In this way, the dust removal effect is guaranteed and the dust collector can operate continuously;

six High dust removal efficiency (generally up to 99.6% It is easy to operate;

Main performance indicators: the pulse air is directly injected into the filter cartridge without passing through the venturi. This will cause the negative pressure on one end (upper part) of the filter cartridge close to the pulse valve, while the other end (lower part) of the filter cartridge will bear pressure, as shown in Fig 6-29 As shown in Fig. This will lead to different dust cleaning between the upper and lower parts of the filter cartridge, which may shorten the service life and make the equipment unable to achieve dust removal.

For this purpose, venturi nozzle for filter cartridge can be installed at the outlet of pulse valve or pulse jet pipe. The distribution of injection pressure is improved to a more uniform positive pressure injection with full filter height.

Dust accumulation in the folding seam of the filter cartridge will make it difficult to remove dust. Therefore, the filter cartridge with large folding area (the filtration area of each cartridge is up to 20~22m2 )Generally, it is only suitable for low inlet concentration. Compare the common filter cartridge size and filtration area.

The gas distribution box of the pulse injection device of the filter cartridge dust collector shall comply with the JB/T 10191-2000 The requirements of. Clean air flow should be free of water, oil and dust. Under the specified conditions, the injection valve and interface of the pulse valve shall be free of air leakage, and can be opened and closed normally with reliable operation.

The pulse controller should work accurately and reliably, and its injection time and interval can be adjusted within the range. When the induction injection device is installed with the injection pipe. The nozzle of the induced injection device should be coaxial with the nozzle hole on the injection pipe, and keep the perpendicularity consistent with the nozzle, and the deviation is less than 2mm

   Filter cartridge and filter material: The filter element of the cartridge type dust collector is a filter cartridge. The structure of the filter cartridge is divided into four parts: the top cover, the metal frame, the pleated filter material and the base. The filter cylinder composed of these four parts is round, flat and conical.

The filter cartridge is folded into pleats with designed length of filter material, and the head and tail are glued together to form a cylinder. The inside and outside of the cylinder are supported by metal frame, and the top and bottom are fixed with top cover and base. The top cover has fixing bolts and washers. The filter cylinder has a round shape.

The bonding of the upper and lower covers and protective nets of the filter cartridge shall be reliable, and there shall be no defects such as degumming, leakage and sagging; the metal parts on the filter cartridge shall meet the anti rust requirements; the outer surface of the filter cartridge shall be free from obvious defects such as bruise, bump, scuffing and burr; the soot blowing and cleaning of the filter cartridge can be equipped with the injection devices such as induction nozzle or venturi tube, and the inner side of the filter cartridge shall be equipped with protective net D 320mm H 1200mm When the filter cartridge is used, the induction nozzle should be used.

The volume of the filter cartridge is closely related to the volume of the filter assembly. The main engine using the filter assembly often puts forward the following requirements for the filter: ① There are a series of performance requirements related to filtration characteristics, such as the total height and the distance (width) between the inlet and outlet of the precipitator, the total height and diameter of the lower body of the filter cartridge, the total mass of the filter cartridge, the connection mode and size of the air outlet, and the filtering accuracy.

The following elements should be paid attention to when designing the filter cartridge according to the assembly requirements.

(l) The outer diameter of the filter cartridge is larger than the inner diameter of the filter cartridge 10mm The above is appropriate. This is because the high and narrow space can make the pollution particles slowly settle in the outer layer of the filter cartridge, so that the filter cartridge can receive the pollution plug evenly from top to bottom.

(2) The determination of the diameter of the inner framework mainly considers that the size of the oil hole should not affect the filtering gas volume, and the influence of the hole size on the strength of the framework should be taken into account.

(3) The total strength of the inner framework is important. First of all, the pressure difference of the filter cartridge should be supported by the framework, so the smaller the diameter, the higher the strength.

(4) The height of wrinkled teeth should be selected at l0~50mm Between is better.

(5) When the required filtration product is calculated, the area should be increased one Times. This is because we should fully consider the actual work, dust pollution is unpredictable.

filter material

Filter cartridge There are two kinds of filter media: one is synthetic fiber filter material, the other is paper filter material.

Synthetic fiber nonwoven filter material. According to the processing technology, it can be divided into continuous fiber spunbonded polyester hot pressing and short fiber spunbonded polyester hot pressing. Under the condition of surface treatment of filter material, the wetting angle of treated filter material shall be greater than ninety Degree, and the water level is not lower than grade IV. Under the condition of filter material treatment, the filter material is treated. Polyester nonwoven filter material can withstand working temperature not less than one hundred and twenty ℃。 For other special working conditions such as high temperature and high humidity, the selection of filter cartridge material structure should meet the application requirements.

Paper filter media can be divided into low air permeability and high air permeability.

In addition, there are synthetic fiber non-woven polytetrafluoroethylene membrane filter material and paper polytetrafluoroethylene membrane filter material.