|Industrial dust treatment equipment series|
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|Grinding polishing dust removal equipment|
|Stand-alone dust collector|
|Spiral duct and accessories series|
What should I pay attention to when handling bag dust removal equipment? Dusty gas containing tar mist
Gases containing only tar mist are difficult to handle, but the oil mist in the gas is not large and the dust content is large, which can be directly filtered. For example, in an asphalt concrete plant, the flue gas produced by the stone mill enters the equipment together with the exhaust gas such as dust generated by the transportation means. In addition. At the mixer and finished product discharge. Tar mist generated by heating asphalt concrete also enters the equipment. In this case, the amount of dust deposited on the filter cloth far exceeds the amount of oil mist, which can avoid the trouble of oil mist adhesion and ensure stable operation.
In the manufacture of electrodes and molded carbon products, tar mist is also generated during the process of mixing powder into a hot binder. At this time, if the dust generated during the crushing and transportation is the main treatment, it can only be used when mixing part of the tar mist. However, if the tar of the tar furnace of the tail tar furnace contains more tar, before the flue gas enters, an appropriate amount of tar powder should be added to absorb the coke fog to obtain a satisfactory result.
If the gas contains only a small amount of oil mist, it can be treated separately. That is, an appropriate amount of powder can be added to the pipeline as a filter aid. After absorbing the tar mist, the added dust should be returned to the production process for use as much as possible.
What should I pay attention to when handling bag dust removal equipment? 2.Dust-concentrated gas
For the treatment of high dust concentration gas, a cyclone or gravity dust removal equipment can be installed as pre-dust. However, this will increase the resistance of the system and increase power consumption. Therefore, when the dust or material products do not need to be classified, most of the bag type dust removal equipment is used directly.
Not all bag dust removal equipment can handle high dust concentration gases. Only bag-type dust removal equipment with a wide separation between filter bags and continuous dust removal devices in the form of external bag filters are suitable for the treatment of high dust concentration gases.
When handling high dust, try to make the dust fall directly into the ash hopper or install a baffle to reduce the amount of dust attached to the filter bag. Prevent the filter cloth from being damaged by friction. The dust moving at high speed should not directly impact the filter cloth.
The middle of the box can also be used as a pre-dust collector, a dust dynamic sedimentation chamber, and an air inlet diverting chamber.
Although the bag type dust collector used for dust removal of the pneumatic conveying device has a small air volume and a high dust concentration, the cabinet needs pressure resistance, so the cylinder shape is more. Qualified enterprises can replace bag filters with plastic burner plate filters.
The inlet of the cylindrical box is tangential, which makes it have a separation function. Many rotary backflush bag filters are in this form. The ash bucket part is sometimes made in the form of a cyclone. For bag dust collectors in pneumatic conveying systems, due to the large amount of dust, the ash bucket volume and ash discharge diameter must be designed larger, and the capacity of the ash discharge device must also have sufficient space to prevent dust from remaining in the ash bucket.
What should I pay attention to when handling bag dust removal equipment? 3. Hygroscopic deliquescence dust Hygroscopic deliquescence dust
Cao, na2co 3, nah co 3, NaCI, etc. It is easy to absorb moisture and harden on the surface of the filter cloth, or become a viscous liquid after deliquescence, making it difficult to remove dust, increasing pressure loss, and even being forced to stop working. In this case, the general precautions for handling hygroscopic and deliquescent dust are as follows.
No matter whether the dust source facility is running continuously, it should not be started while the dust source facility is running. When dust is deposited on the filter cloth to form a layer, moist air cannot pass through. Many drying and sintering kiln exhaust gases are mostly high temperature and high humidity gas. When the operation is stopped, the temperature drops, the humidity rises, and it is easy to absorb moisture.
Therefore, a small hot air generator should be installed on the dust removal equipment. In this way, when the dust source device is stopped, the temperature inside the hot air can be kept as it is. Using pre-coating method, that is, in the case of local dust collection at a low dust concentration, other powders can be pre-coated on the filter cloth, that is, only other powders can be supplied to the pipeline. After running for a period of time, the collection needs to be collected Before the wet dust, attach a layer of this dust on the filter cloth.
A lint-free cloth and a lint-free cloth should be used. If felt filter material is used. Surface treatment should be performed. The selection principles are:
a. Post-treatments such as surface coating and calendering can also improve abrasion resistance. For glass fiber filter materials, silicone oil, graphite and polytetrafluoroethylene resin treatment can improve abrasion resistance and folding resistance.
b. Chemical fiber is better than glass fiber, expanded glass fiber is better than ordinary glass fiber; fine short curly fiber is better than thick long smooth fiber.
Felt is better than fabric. Needle punching is suitable for felt sheet to strengthen the interweaving of fibers. Satin fabrics are very good. Raising the surface of the fabric is also a measure to improve abrasion resistance.
An off-line cleaning operation system should be used. When the bag filter is stopped, completely remove dust on the surface of the filter cloth.
What should I pay attention to when handling bag dust removal equipment? 4, flammable and explosive powder
Do a good job in the selection of dust control and anti-static dust bag
As an important part of the process system, bag dust collectors often receive dust-containing gas from pipes and form a dust layer during use. When the dust concentration reaches 20-6000 g / m3, it is in a dangerous state.
Therefore, during the design process, it is necessary to further strengthen the ventilation of the dust removal system and remove the dust in time to ensure that the dust concentration is lower than the dangerous range. At the same time, care should also be taken to remove the funnel dust. The funnel dust will continue to accumulate heat in the leak, which may cause the dust to ignite spontaneously.
In addition, because the dust is not in a closed state during the accumulation process and there is circulating air inside, it has created conditions for dust explosion to a certain extent. Practice has proved that the use of a double-layer pneumatic ash discharge valve can not only reduce the air leakage rate, but also effectively prevent dust Spillover.
In the selection of antistatic dust removal bags, because a large amount of coal dust, chemical dust, etc. will increase the probability of explosion accidents when encountering static electricity, antistatic dust removal bags can choose stripe antistatic and blended antistatic products. The former is mainly in Needle felt base cloth is set with copper-impregnated composite conductive yarn in the warp yarns, the latter mainly uses conductive fibers in the material. In the specific selection, it can be combined with the actual situation of production to give full play to the role of anti-static dust bag. Ensure that the vacuum cleaner is grounded reliably.
What should I pay attention to when handling bag dust removal equipment? More related introduction: bag dust removal equipment