When it comes to the cloth bag dust remover used by the generator set, the dust emission will exceed the standard once the service cycle is relatively long. Below, the xiaobian of environmental protection dust remover will analyze the main reasons for its failure and the main countermeasures for everyone:

Analysis of damage reason of filter bag:

The failure of filter bag is related to the design, installation, operation, quality of filter bag, application range of filter bag and match of flue gas condition. The main reasons of failure are chemical corrosion, mechanical damage and wear.

Chemical corrosion:

It is mainly due to the excessive temperature of flue gas, the high oxygen content of flue gas, the high concentration of SOx/NOx entering the cloth bag dust collector, and the combination of water and gas, resulting in the oxidation corrosion of the filter bag.

Mechanical damage and wear:

It is mainly caused by the uneven distribution of flue gas, the collision between the improper installation of the bag cage, the improper alignment of the spray pipe with the cloth bag, and the damage of the filter bag caused by the high velocity of flue gas.

(1) fly ash and smoke wear. When the flue gas enters the cloth bag unit chamber, the impact of dust particles on each other in the space part produces eddy current, which mostly ACTS on the vertical surface of the outer cloth bag and the bottom of most cloth bags. Therefore, the bottom of most cloth bags is damaged, the cloth bags at the edge of the bag chamber are more likely to be damaged than those in the middle of the bag chamber, and the cloth bags at the smoke inlet are more likely to be damaged than those at the distance.

(2) there is no protective dust layer on the surface of sporadic replacement of the cloth bag, which is easy to suffer from ash abrasion, oil pollution and adhesion of other substances, resulting in clogging of the cloth bag. The increase of output load of other cloth bags accelerates the damage of the cloth bag.

(3) the high material level causes the cloth bag to be damaged. If the material level is too high and the cloth bag is submerged, the ash accumulated at the contact point between the flue gas flowing through the bag and the cloth bag at a certain speed will cause disturbance, so that the ash close to the cloth bag will form eddy currents of different degrees. In addition, the ash concentration at the contact point will be higher, further aggravating the wear of the cloth bag.

(4) improper spray control. The air flow in each bag area is uneven, and the improper injection pressure and Angle lead to the bag damage.

(5) the quality of cloth bags is not up to standard. Due to the poor quality of the manufacturer, the sewing thread of the cloth bag broke and was damaged by high temperature, causing the cloth bag to be damaged.

(6) during the installation of the cloth bag, there is no timely detection of bump or scratch, resulting in damage to the bump and scratch during operation.

Measures to improve the service life of filter bags:

Strengthen the operation management of bag-type dust collector:

The number of filter bags to be replaced after the dust remover overhaul is large. Dust collector inlet smoke temperature control in the flue gas acid dew point more than 20 ℃ to 25 ℃, but not higher than 160 ℃, chemical prevention of flue gas of filter bag; The dust hopper of the dust collector cannot operate at a high material level to avoid the occurrence of the phenomenon that the dust level is too high to cover the cloth bag and the dust scour the bottom of the filter bag leading to the damage of the filter bag. Boiler leakage, to timely exit the dust collector operation.

The maintenance of dust remover should pay attention to:

Dust collector in the maintenance before the application of fluorescent powder leak test, find out the leakage point, all of its elimination; For the blocking plate reserved on the flower plate of the dust remover, cancel the blocking plate of the flower plate, and add all the filter bags; Bypass baffle door seal is not strict to seriously deal with, improve the bypass door structure, to avoid leakage; Carefully check the spray Angle between the nozzle and the bag mouth to avoid the deviation of the air flow and the loss of the filter bag. Check and maintain the dust collector hopper level meter frequently to eliminate the phenomenon of display distortion. For the sporadic replacement of the bag, before the installation should be precoated with dust; After installing the filter bag, carefully check the distribution of the bottom of the bag, and repair and reset the filter bag that appears torsion and collision. During installation, strictly follow the installation specification to avoid foreign matters being transferred into the cloth bag. The cage clamp must be properly stuck to avoid the use of invalid clamp. Use the maintenance opportunity to install a large grid at about 1.5m of the dust hopper of the dust remover to prevent the ash outlet from being blocked after the cloth bag falls off. The air leakage of boiler air preheater and the air leakage of dust remover body should be controlled so that the oxygen content of dust remover during operation should not exceed 6%. If the analysis of damaged filter bag is not clear due to its own technical strength, it shall be submitted for inspection and analysis. The filter bag can be replaced as a whole or in the whole bag room of the dust remover, and a professional installation team can be selected to avoid the problems such as the mouth wear, bag loss and the coordination with the framework of the filter bag caused by the irregular installation of the filter bag.