At present, under the high pressure of environmental protection, many industries are facing severe tests, and enterprises have also made environmental protection a top priority. 袋式除尘器 是治理大气污染的高效 除尘设备 ，应用甚广。 We know that bag dust collectors are high-efficiency dust removal equipment for air pollution control and are widely used. Today this site will take you to understand the five parts of the bag filter that are easy to wear, the reasons and corresponding measures, and you can easily deal with such situations in the future. During the operation of the dust removal system, users pay more attention to the work efficiency and service life of the dust collector, and often neglect the safety issues and routine maintenance of the dust collector. Only by doing routine maintenance and troubleshooting in time can the dust removal equipment work more stably and efficiently. The following is a summary of the five parts of the bag filter that are easy to wear and the corresponding measures.
为您介绍：袋式除尘器是去除废气中粉尘污染物的高效除尘设备。 Nengda Environmental Engineering Technology (Changzhou) Co., Ltd. introduces you: The bag type dust collector is an efficient dust removal device for removing dust pollutants in exhaust gas. The principle of dust removal is mainly: the dust is filtered by the dust cake attached to the surface of the filter material. High dust removal efficiency is its outstanding advantage. When the dust-containing exhaust gas is filtered by a bag filter, the emission concentration can generally reach below 50 mg / m3, and even reach 5 mg / m3. Today, environmental protection requirements are getting higher and higher, bag dust collectors have advantages that are difficult to compare with other dust removal methods.
Bag type dust collector is generally composed of the host, filter element (dust bag) and auxiliary systems such as backflush control. The dust bag is the core component of the bag type dust collector. Its material, sewing, use and maintenance are related to the efficient and stable operation of the entire system. And other factors may cause the dust bag to break and lose its effectiveness. Among the many types of dust bag damage effects, abrasion is a common type and is closely related to the design, manufacture and application of the dust collector.
The types and causes of the dust bag loss effect:
Common dust removal bag breakage effects are mainly abrasion, burnout and corrosion.
Filter bag wear refers to the local abrasion caused by the dust bag during the use of the bag, due to repeated filtering and back blowing state, the bag swells and shrinks, relative movement between the bag and the dust removal framework or other components, high-speed dust-containing air scour.
The dust bag is burnt because the flue gas being processed is abnormally high temperature or high temperature dust particles, the temperature is higher than the tolerance temperature of the filter material, which will cause damage to the filter material in the high temperature area and cause damage.
Filter bag corrosion is caused by the chemical reaction of the filter material caused by the harmful components in the flue gas, which causes the mechanical properties of the filter material to decline and lose its effectiveness. Corrosion of filter bags mostly occurs when the smoke composition exceeds the standard, which can be divided into gas corrosion and liquid corrosion. In the presence of liquid, harmful gas components are more likely to cause filter bag damage.
Due to the presence of liquid components (such as condensation) in the flue gas, a paste-like substance is formed with the dust, which blocks the gap between the filter bags, causing the paste bags to cause dust removal failure.
Prevention and treatment of dust bag wear:
Dust removal bag wear is the main type of bag damage effect. After other damage types cause small holes to be damaged, the dust-laden airflow will also cause further wear. The wear is closely related to the structure design of the bag filter, air flow organization, back blowing dust removal, etc. The parts of the dust filter bag wear are divided into the following five cases: filter bag mouth, filter bag body, filter bag bottom, filter bag bottom and inside of the filter bag. The wear and tear of different parts and their factors are different. The solution Also different.
First, the abrasion of the dust bag bag mouth part:
The wear of the bag mouth is mostly within 400mm of the bag mouth downwards, and most of the damage marks are from the inside to the outside. The initial stage of this type of wear is mainly caused by the compressed air blowing back from the middle of the filter bag and directly flushing the side wall of the filter bag. Under the continuous flushing of compressed air deviating from one side, the inner side layer of the filter bag was blown off by compressed air first, then the base cloth was blown out, and finally the filter surface was blown out. When the side of the filter bag is damaged, the resistance at the damaged area decreases, and dust-containing smoke will quickly enter from the damaged area, scouring the diagonal of the damaged area, forming new voids and new dust-containing smoke inlets, and the increasing number of voids will eventually cause the bag The mouth ring is damaged. In severe cases, the bag head and the bag body are separated. Such damage is mainly caused by excessively high pressure of compressed air, skew of the short injection tube, and deformation of the flower plate. Once such wear is found, the anti-injection device should be adjusted before changing to a new bag.
Second, the filter bag body wear:
Abrasion of the bag body of the dust-removing cloth bag, there are common vertical strip wear marks in the middle of the filter bag, which are divided into several cases:
1. If the damage trace is from the inside to the outside, and the damage is at the contact point of the vertical ribs of the bag cage, it means that the vertical ribs of the bag cage are de-welded or rusted, the filter bag is worn off or the blowing pressure is too high and the blowing is too frequent. The contact position of the bag cage is broken due to folding and breaking. Such wear problems can be solved by replacing the bag cage or adjusting the blowing device.
2. If the damage trace is from outside to inside, the damage is at the vertical rib contact of the bag cage. It is often seen that there are marks on the outside of the filter bag (adjacent filter bag or box member) that rub against the filter bag. This type of wear is caused by the deformation of the bag cage or the installation of the filter bag is too small, the diameter of the filter bag is too large or loose, which causes the contact between the filter bag and the filter bag, the filter bag and the dust collector box component. The swellings rub against each other and wear them. Generally, the bag cage needs to be replaced, and the installation quality is guaranteed. During the design of the bag filter, the distance between the filter bags and the distance between the filter bag and the box structure should be avoided.
Third, the lower part of the dust bag is worn:
The outer wear of the lower part of the filter bag is more common within 300mm of the bottom of the filter bag, and the wear is mostly on one side. The lower part is the most serious, and it gradually decreases upward. Part of the sewing thread will be worn out, and the thread will be strong in the place where it is not worn. Such abrasion is mostly caused by deformation of the flower plate, too small hole spacing, deformation of the bag cage, and too long filter bags. Some of the filter bags and dust collector box walls were damaged by friction. Such damage requires strict inspection of the level of the flower plate, and a well-made bag cage should be used.
Annular abrasion in the lower part of the filter bag: An annular abrasion cavity is formed in the lower part of the filter bag from the outside to the inside. This type of wear is caused by the local scouring of the filter bag by the dusty flue gas, which indicates that the air velocity in the filter bag is too large. It is more common in dust collectors with higher filtering wind speed or more abrasive dust. When one side of the filter bag is damaged, the dust scours the damage diagonally, and the damage continues to expand over time. Serious damage to the filter bag can cause the filter bag to break in a ring. .
The inner part of the lower part of the filter bag is abraded: It is more common in the contact position with the bag cage. Most of them are too different in diameter from the bottom of the bag cage and the bottom of the bag cage, which causes the filter bag to change too much in filtering and filtering, and the bag cage is worn and damaged. Replacement of high quality bag cage can solve it.
Fourth, the bottom of the filter bag is worn:
The outer side of the bottom of the filter bag is worn: there are obvious signs of wear on the damaged surface. The bottom sewing thread and the filter base fabric are worn out. In severe cases, the bottom of the bag is damaged or falls off. This type of wear is due to the high level of material in the ash hopper, and the airborne dust particles directly flush the bottom of the bag, causing wear. By increasing the ash discharge volume of the ash bucket and adjusting the ash discharge system of the ash bucket of the dust collector to avoid excessive accumulation of dust, the eddy current wear filter bag can be avoided in the ash bucket.
The inside of the bottom of the filter bag is often worn when the bottom of the bag cage is too small or the filter bag is too long. The bag cage can only support the bottom of the bag. When the filter bag is cleaned and the filter is switched, the bottom of the filter bag is shaken, causing the inside of the bottom of the filter bag to wear.
Fifth, the inside of the dust bag is worn:
Damage to the inside of the filter bag is mostly caused by the large difference between the outside diameter of the bag cage and the inside diameter of the filter bag, which results in excessive swing of the filter bag during dust removal and filter switching.
The damage location of the inside of the filter bag is at the bag cage, and there are rust marks on the worn parts. Most of the bags have corroded oxide layers on the surface. At this time, the surface of the bag cage is like sandpaper, and the filter bag will be seriously rubbed once every time , And eventually wear the filter bag. Use a high-quality bag cage that matches the filter bag to prevent wear on the inside of the filter bag.
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The dust bag is the heart of the whole dust collector. The failure of the filter bag will make the entire equipment unable to operate normally. The wear of the filter bag is mainly related to the design and application, manufacture, and installation quality of the dust collector. The abrasion process starts locally, but as long as small abrasion holes are formed, they will spread quickly and cause larger filter bag damage. Therefore, strengthening the inspection and testing during operation and early detection of small wear are also important factors to avoid large-scale filter bag wear.
The above is a summary of the five parts of the bag dust collector that are easy to wear, the reasons, and the countermeasures summarized by Noda Environmental Engineering Technology (Changzhou) Co., Ltd. Doing daily maintenance, finding and solving problems in time, ensuring the stable operation of the dust collector can effectively improve the dust removal efficiency. Environmental storms are returning. Is your company ready for environmental protection measures?