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Bag filter

Bag filter for sand making machine

浏览 Author Admin Browse Published 17/08/17

1 Overview:
During the production process of the sand machine production line, due to crushing, screening, belt transfer, material fall, etc., a certain amount of dust will be raised. And because the ore generally contains a large proportion of silicon dioxide, commonly known as silicon, its dust must also contain silicon. After such dust is inhaled into a person's lungs, it is difficult to discharge it. Over time, people will develop a very serious occupational disease, silicosis. Therefore, to control the dust, a better way now is to install a bag filter.

2. Principle of bag filter for sand making machine:
The main structure of the sand maker bag filter is composed of the upper box, the middle box, the ash bucket, the ash unloading system, the blowing system and the control system. And equipped with foundation pillars, ladders, railings, access doors. Adopting a lower air intake structure, dust-containing flue gas enters the ash hopper from the air inlet through the lower part of the middle box, and some larger dust particles directly fall into the ash hopper due to inertial collision and natural settlement. Other dust particles rise with the airflow. After filtering by the filter bag, the dust particles are blocked on the outside of the filter bag, and the purified gas enters the upper case from the inside of the filter bag, and is discharged into the atmosphere through the air outlet through the air pipe and the fan. The dust in the ash hopper is discharged regularly or continuously by the unloader.
With the continuous filtering process, the dust accumulated on the outside of the filter bag is constantly increasing, which causes the resistance of the baghouse dust collector itself to continue to increase. When the resistance reaches a predetermined value (which can be determined during equipment commissioning), the dust cleaning controller sends out a signal, then opens the electromagnetic pulse valve, and injects 0.4-0.5Mpa of compressed air into the box in a very short time. Compressed air is sprayed from the air source through the air bag, the pulse valve, the nozzle on the blowing pipe and the filter bag in a very short time (0.1-0.2S). Compressed air expands at a high speed in the box, causing high-frequency vibration and deformation of the filter bag, and the effect of reverse air flow, so that the dust on the outside of the filter bag falls off. After ensuring that the dust falls off, open the next electromagnetic pulse valve for such a cycle. During the cleaning, each solenoid valve is separately performed in accordance with the preset sequence, and does not interfere with each other to achieve long-term continuous operation.
3. Main performance characteristics of bag maker for sand making machine:
1. The bag dust removal structure is more reasonable, and the filtering wind speed is still within the normal range during online cleaning, which greatly prolongs the service life of the bag.
2. The top of the bag filter is equipped with a quick-open cover, which can be easily checked and maintained.
3. The bag dust collector used is a bottom air inlet structure and is equipped with a pre-dust collection mechanism, which not only overcomes the shortcomings of dust directly washing the worn bag, but also improves the dust collection effect.
4. The key parts of this dust collector are imported parts. For example, the pulse valve is imported parts, and the diaphragm has a service life of more than 1 million times. The surface of the cage frame of the bag is siliconized, which can effectively prevent corrosion and be more adaptable. For special gas dust removal.
5. This equipment has perfect automatic control, no manual operation is required after starting, the collected dust will automatically flow into the raw material barrel with the automatic opening of the ash discharge valve;
6. The connection between the cloth bag, the cage and the flower plate adopts a unique structure, which makes the cloth bag fixed more reasonably, more convenient during installation and replacement, and can better ensure the installation size of the cloth bag.
4. Technical characteristics of bag making equipment for sand making machine:
1. The dust removal efficiency can reach 99.9%, and the emission of smoke and dust is ≤50mg / m3.
2. Not affected by dust properties such as smoke composition, dust concentration, particle dispersion, specific resistance, etc.
3. The ability to adapt to dust is relatively strong, and it can adapt to dust conditions with high specific resistance, high concentration and fine particles that the electrostatic precipitator cannot collect.
4. While collecting the powder, taking auxiliary measures can also effectively remove ultrafine particles and heavy metals As, Hg, Se and other toxic and harmful gases, which have a synergistic effect.
5. The structure is relatively simple, and the operation and maintenance are convenient. The main cleaning process can be automatically controlled by the program, thereby greatly reducing the operation and maintenance costs.

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