The structure and working principle of the pulse cartridge dust collector

Shanghai Kaisen Environmental Protection Technology Co., Ltd. has long been committed to the design, R&D and manufacturing of purification products such as welding and cutting fumes, grinding dust, oil mist and fumes. The company's products adopt foreign advanced technology, forming a multi-series and diversified smoke and dust purification products and integrated system engineering. The company's products are widely used in welding, cutting, grinding, spraying, casting, chemical, wood processing, tobacco, ceramics, papermaking and other industries.

The pulse filter cartridge dust collector is equipped with an air inlet, a filter cartridge, an air outlet, an air bag, a pulse controller, a spray valve, a blow pipe, etc., the filter cartridge is made of polyester fiber folded and rolled, its lower end is closed, and the center of the upper end is facing the lower mouth of the blow pipe After the dusty gas enters the dust collector from the air inlet, the air flow speed slows down, and the coarse particles settle into the dust collection chamber out of the air flow, and the fine dust is blocked on the outer surface of the filter cartridge when passing through the filter cartridge with the air flow, and the clean gas is discharged from the air outlet; When the ash layer on the surface of the filter cartridge is thick, the pulse controller sends a command to open the injection valve, and the compressed air in the air bag is sprayed out at high speed through the injection pipe, and at the same time, the surrounding air several times the amount of the jet air is induced to enter the filter cartridge, and is rapidly shot out from the inside to the outside, and the dust on the outer surface of the filter cartridge is blown down and falls into the dust collection chamber, and finally discharged by the ash hopper. The dust collector adopts pulse injection mode for dust cleaning, which not only achieves thorough ash cleaning, but also does not harm the filter cartridge, so that the service life of the filter cartridge can be guaranteed. The cleaning process is automatically controlled by a pulse controller, which can be controlled by differential pressure or time.

Pulse filter cartridge dust collector is a new type of filtration and dust removal device, which has high purification efficiency, small size, large filtration area, good filtration effect, small pressure loss, long service life of filter cartridge, fast and convenient installation and maintenance, and can be used continuously. Then I will give you a detailed introduction to the working principle and characteristics of the pulse filter cartridge dust collector.

Pulse dust removal principle explained.

The air flow containing wood pellets is transported to the deflector bin of the bag screening program through the fan, the air flow rate is reduced under the action of the deflector, the heavier wood pellets fall into the ash bin under the action of gravity, and the other lighter and finer dust is adsorbed on the outer surface of the filter bag with the air flow, and after the filtration of the bag, the clean gas enters the exhaust chamber and is discharged to the outside to collapse. As the filtration condition continues, more and more dust accumulates on the outer surface of the filter bag, which will increase the hidden operating resistance of the system and reduce the dust removal efficiency of the system. After the pulse amplitude and frequency are set, the system will automatically complete the cleaning of the filter bag during the working process, so as to greatly increase the filtration efficiency and prolong the service life of the filter bag.

Scope of application. It is widely used in the purification of dusty gases and dust materials in food, pharmaceutical, feed, metallurgy, building materials, cement, machinery, chemical industry, electric power and light industry industries.

System features: 1. The filter cartridge uses imported polyester fiber as the filter material, and a layer of submicron-level ultra-thin fibers is adhered to the general filter material, and the fibers are arranged very tightly on the adhesive layer. 2. The filter material can be folded and used, which can increase the filtration area and make the dust collector more compact;

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

4. Compared with the dust collector of the same volume, the filtration area is relatively large, the filtration wind speed is small, and the resistance is not large;

5. The dust collector adopts the pulse jet line cleaning method. The cleaning process is automatically controlled by a pulse controller, and the user can use the time control method to clean the ash as needed. A plurality of filter cartridges are arranged in the dust collector to increase its effective filtration area, and when a certain (pair) filter cartridge meets the setting requirements of ash cleaning, the injection device is started for ash cleaning, and other filter cartridges work normally, so that the ash cleaning effect is achieved without affecting the operation of the equipment, so that the dust collector can run continuously;

6. High dust removal efficiency (generally up to the above), easy to operate;

According to the filter cartridge material, the filter cartridge dust collector can be divided into long fiber polyester filter cartridge dust collector, composite fiber filter cartridge dust collector, anti-static filter cartridge dust collector, flame retardant filter cartridge dust collector, membrane filter cartridge dust collector, nano filter cartridge dust collector, etc. The following will introduce the working principle and characteristics of the filter cartridge dust collector.

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 flow 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 fine and small density dust particles enter the dust filter chamber, the dust is deposited on the surface of the filter material through the combined effects of Brownian diffusion and sieve filtration, and the purified gas enters the clean air chamber and is discharged by the exhaust pipe through the fan.

The resistance of the cartridge dust collector increases with the increase of the thickness of the dust layer on the surface of the filter media. Cleaning is carried out when the resistance reaches a certain specified value. At this time, the PLC program controls the opening and closing of the pulse valve, first a chamber lift valve is closed, the filter air flow is cut off, and then the electromagnetic pulse valve is opened, and the compressed air and a short time are rapidly expanded in the upper box, pouring into the filter cartridge, so that the filter cartridge expands and deforms to produce vibration, and under the action of reverse air flow, the dust attached to the outer surface of the filter bag is stripped off and falls into the ash hopper.

After the ash cleaning is completed, the solenoid pulse valve is closed, the poppet valve is opened, and the chamber resumes the filtering state. Cleaning each chamber is carried out sequentially, from the first chamber cleaning to the next cleaning cycle for a cleaning cycle. The detached dust falls into the ash hopper and is discharged through the ash valve.

In this process, the filter cartridge must be replaced and cleaned regularly to ensure the filtration effect and accuracy, because in the filtration process, in addition to being blocked, some of the dust will be deposited on the surface of the filter material, increasing the resistance, so the general correct replacement time is three to five months!

Characteristics of the cartridge dust collector.

The characteristics of the pulse filter cartridge dust collector are as follows: 1. The filter cartridge uses imported polyester fiber as the filter material, and a layer of submicron-level ultra-thin fibers is adhered to the general filter material, and the fibers are arranged very tightly on the adhesive layer, and the extremely small sieve hole can block most of the sub-micron dust particles on the surface of the filter material;

2. The filter material can be folded and used, which can increase the filtration area and make the dust collector more compact;

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

4. Compared with the dust collector of the same volume, the filtration area is relatively large, the filtration wind speed is small, and the resistance is not large; 5. The ash cleaning method of the stand-alone dust collector adopts the pulse jet line cleaning method. The cleaning process is automatically controlled by a pulse controller. A plurality of filter cartridges are arranged in the dust collector to increase its effective filtration area, and when a certain (pair) filter cartridge meets the setting requirements of ash cleaning, the injection device is started for ash cleaning, and other filter cartridges work normally, so that the ash cleaning effect is achieved without affecting the operation of the equipment, so that the dust collector can run continuously; The combined dust collector adopts the automatic loop cleaning of the off-line pulse in the chamber.

Each dust chamber is provided with a plurality of filter cartridges to increase its permeability effective filtration area, when a dust chamber filter cartridge meets the setting requirements of ash cleaning, that is, the potato dynamic injection device is activated to clean the ash, and the other dust chambers work normally, so that the ash cleaning effect can be guaranteed and the dust collector can be operated continuously;

6. High dust removal efficiency (generally up to the above), easy to operate;

The working principle of pulse bag filter, also known as filter dust collector, is a dry high-efficiency dust collector, which is a dust removal device that uses a bag filter element made of fiber fabric to capture solid particles in dust-containing gas. The principle of action is that the dust particles are intercepted by the inertial force when they collide with the fibers when winding the filter cloth fibers. The bag filter is a dry dust collection device, which is suitable for capturing fine, dry non-fibrous dust.

The filter bag is made of textile filter cloth or non-textile felt, and the filtering effect of fiber fabric is used to filter the dust-containing gas, when the dust-containing gas enters the bag dust collector, the dust with large particles and specific gravity settles down due to the action of gravity, falls into the ash hopper, and the gas containing finer dust is retained when passing through the filter material, so that the gas is purified.

After the dust-containing gas enters the dust hopper of the dust collector, due to the sudden expansion of the air flow section, a part of the coarse dust particles in the air flow settles down under the action of gravity and inertia force, and the dust particles with fine particle size and small density enter the filter chamber, and the dust is deposited on the surface of the filter material through the comprehensive effect of Brownian diffusion and sieve filtration, and the purified gas enters the clean gas chamber and is discharged by the exhaust pipe through the fan.

The resistance of the filter cartridge dust collector increases with the increase of the thickness of the dust layer on the surface of the filter material, and when the resistance reaches a certain specified value, the ash is cleaned, and the pulse controller controls the opening and closing of the electromagnetic pulse valve. When the pulse valve is opened, the compressed air in the air bag sprays a high-speed and high-pressure induced air flow through the small hole on the injector pipe through the pulse valve, so as to form an induced defect flow equivalent to 1 2 times the volume of the induced air flow, which enters the dust removal filter cartridge together, so that the instantaneous positive pressure in the dust filter cartridge and the swelling and micro-movement are generated; The dust deposited on the filter material falls off and falls into the ash hopper, and the dust in the ash hopper is continuously discharged through the discharger.

This pulse injection cleaning method is to clean the ash sequentially of the filter cartridge filter material one by one, and the pulse valve opens and closes to produce a pulse action at a time, and the time required is that; The interval between two adjacent opening and closing of the pulse valve is 1 2 min, and the time required for all filter cartridges to complete a cleaning cycle is 10 30 min. Since this equipment is low-pressure pulse cleaning, the injection time should be appropriately extended according to the resistance of the equipment, and the injection interval and injection cycle should be appropriately shortened.

Due to the emergence of new filter media and the improvement of dust collector design, filter cartridge dust collectors began to be applied in dust removal projects. Cartridge dust collectors have the advantages of small size and high efficiency.

How it works.

Normal operation. Under normal operation, the dusty air enters the HR dust collector through the top inlet, and then disperses through the deflector plate down through the filter element, and the dust is blocked on the outer surface of the filter element, and the filtered clean air enters the clean air chamber through the center of the filter element and is discharged through the outlet pipe.

Cartridge cleaning. Filters can be cleaned automatically and intermittently in such a way that only one group (2) of filters can be cleaned offline at any given time.

In the process of cleaning the filter element, the pulse controller turns on the power supply of an electromagnetic pulse valve, so that the corresponding membrane valve sprays pulse high-pressure air, and the high-pressure air passes through the filter element from the inside to the outside, and the dust attached to the outer surface of the filter element is removed, and the dust particles fall into the dust hopper and then enter the ash collection barrel.

The compressed air pressure is best adjusted to 6kg cm2, and the compressed air pressure of 6kg cm2-7kg cm2 is the most standard setting value that can meet the requirements of the ash cleaning function. The lower the set value of the compressed air pressure, the smaller the air consumption of the pulse valve. The pulse injection controller can generally be adjusted to clean a column of filter elements every two minutes, that is, a pulse valve is connected every two minutes, and the pressure of the compressed air can be increased to increase the ash cleaning energy, but it should not exceed 7kg cm2.

The filter cartridge dust collector is operated under negative pressure, the dust-containing air flow enters the box from the air inlet located at the upper part of the dust collector, the deflector plate in the box forces the air flow down through the filter cylinder, due to the sudden expansion of the air flow section, a part of the coarse dust particles in the air flow settles down under the action of gravity and inertia force, after the dust particles with fine particle size and small density enter the filter room, the dust is deposited on the surface of the filter material through the comprehensive effect of Brownian diffusion and sieve filtration, and the purified air penetrates the filter material into the clean room and is discharged from the air outlet.

When the dust accumulates more and more on the surface of the filter material and the resistance reaches the set value, the pulse valve hits, and the compressed air is sprayed directly into the center of the filter cartridge, and the filter cartridge is sequentially pulse cleaned, and the dust is shaken off to restore the low-resistance operation, and the dust collected in the ash hopper is continuously discharged through the ash discharge valve. During maintenance, the filter cartridge can be easily removed by manually unscrewing the handwheel on the access cover.

In the process of dust removal from the air inlet of the filter cartridge dust collector, the larger particles (100 m in diameter) are settled first. Smaller particles (diameter) are adsorbed on the surface of the cartridge in the air handling chamber. The purified air passing through the filter cartridge is discharged through the exhaust chamber. When the operating resistance of the equipment reaches a certain level, the pulse controller triggers the solenoid valve to open, and the compressed air (p=blows inside the filter cartridge through the blowing pipe, so that the dust particles fall off under the action of instantaneous high-pressure airflow, so as to reduce the filtration resistance to complete the dust removal and cleaning process.

Through the periodic cleaning of dust on the surface of the filter cartridge, the operating resistance of the equipment is relatively stable, which is an important part of ensuring the normal operation of the dust removal system. The dust that settles and cleans up is collected in the ash hopper, which is automatically discharged by the ash discharge valve or gathered in the ash bucket, and is manually discharged regularly.

The filter cloth is folded to form a cylinder, and the upper and lower parts are fixed into a firm cylindrical composition, so as to replace the function of the filter bag in the bag filter. With the same volume, the filter cartridge has a larger filtration area, which is easy to install and replace.

The working principle is the same as that of the pulse bag filter, the filter cartridge filters the dust, sprays the dust after reaching a certain resistance value, and then circulates all the time. Because the filter cartridge dust collector is light and compact and has a large processing capacity at the same volume, it is often used for storage tank storage and dust removal in small workshops.