Excuse me, what is the sticky substance in the bag area of the dust collector?

After using the dust bag, it will stick to the bag. Summarize the following reasons and solutions, hoping to help you.

Reason one: there is no pre-spraying before the new bag is operated.

Description: Due to the lack of pre-injection, a small amount of fuel used in blowing furnace reached the surface of the bag, forming a layer of adhered dust, which could not be removed by on-line ash cleaning, and the resistance of the bag increased abnormally.

Solution:

1. Pre-spray bag filter before shutdown;

2. If the impact has been caused, compulsory ash removal shall be carried out immediately;

Reason 2: The boiler tube burst.

Description: Boiler tubes often explode, and a large amount of liquid water reaches the surface of the bag, which makes the dust harden and the resistance of the bag increase.

Solution:

1. Repair the tube explosion;

2. Carry out compulsory ash removal in time;

Reason 3: The atomization of desulfurization system before dust collector is abnormal.

Description: The atomizer doesn't work normally, which causes liquid water to reach the surface of the bag directly, which makes the dust harden on the surface of the bag, resulting in an abnormal increase in the resistance of the bag.

Solution:

1. Repair the atomizer immediately to make it work normally;

2. Immediately carry out on-line quick ash cleaning;

3. If the on-line quick ash cleaning effect is not ideal, carry out forced ash cleaning treatment in time;

Reason 4: The amount of desulfurization ash is too large, and the online ash cleaning system is weak.

Description: Pre-desulfurization system produces a large amount of desulfurization powder with high moisture content. After the on-line cleaning system is cleaned, dust remains on the surface of the bag. After a long period of operation, the dust on the surface of the bag hardened. Resulting in large resistance of the cloth bag;

Solution:

1. Properly increase the air pressure of on-line ash cleaning and shorten the injection interval;

2. Compulsory ash removal must be carried out regularly, usually once every 8 months to once a year, depending on the actual situation;

Reason 5: The low operating temperature causes the smoke to condense on the surface of the bag.

Note: The general operating temperature should be 15-25 degrees higher than the acid dew point under this working condition to avoid acid condensation. If acid condensation occurs on the surface of the cloth bag, dust will harden quickly on the surface of the cloth bag, and the resistance of the cloth bag will rise rapidly. In addition, in the process of start-up, with the change of temperature, the temperature will definitely cross the acid dew point, and condensation is inevitable.

Solution:

1. Appropriately increase the temperature of flue gas entering the dust collector;

2. Turn on and turn off the machine according to the specifications (refer to the opening and closing instructions);

3. If acid coagulation has occurred, it should be forced to clean the ash in time to avoid the deterioration of the situation.

Reason six: the dust in the bag is serious.

Note: Due to a small number of bags damaged, the system leaks dust. After the dust leaks, it enters and accumulates in the bag, which makes the bag lose a lot of filtering area and causes great resistance.

Solution:

1. Leak detection and replacement of damaged filter bags;

2. Clean the dust accumulated in the bag with a vacuum cleaner;

Reason 7: The content of moisture and ash in boiler flue gas is too high.

Description: If the moisture content in the flue gas is too high, the possibility of acid condensation will increase, and the dust adhesion will increase, which cannot be removed by the online ash cleaning system. The dust bag will form a thick dust cake on the surface, and the resistance of the bag will naturally be too high. In addition, if the ash content is large (related to coal use), the amount of dust left on the surface of the bag per unit time is large, and the system resistance is relatively high.

Solution:

1. Appropriately increase the inlet temperature of the dust collector;

2. Properly increase the speed and pressure of on-line injection;

3. If on-line injection still can't effectively reduce the resistance after a period of time, compulsory ash removal should be carried out as soon as possible;

Reason 8: Online injection system problem.

Description: The pressure and injection speed of online injection system are the key to determine the injection effect. Frequently asked questions are as follows:

1. Oblique and detached phenomenon of injection pipe (linear injection)

2. Pulse valve can't work normally (air leakage or no action)

3. The injection pressure is too low and unstable (whether the pressure provided by the rotary Roots blower is guaranteed; Whether the pipeline injection pressure is restored in time)

4. The injection interval is too long;

Solution:

1. Check all parts of the injection system to ensure that the connection and sealing of the system are normal and all parts work normally;

2. Check and ensure that the injection pressure is stable; (The rotary low-pressure injection pressure is preferably not lower than 0.085MPa；; The line injection pressure is generally 0.25-0.35 MPa, which can be set according to the situation)

3. Set a reasonable injection speed; (Rotary low-pressure injection system, the injection pressure and speed can be adjusted by determining the number of roots blowers running; The purging speed of the line purging system must be determined according to the speed at which the pressure returns to the set value)

Reason 9: The ash level in the ash hopper is too high.

Description: The dust in the ash hopper cannot be transported away in time, which leads to the high ash level and the large structural resistance of the dust collector.

Solution: conveying ash in time

Cause 10: dust infiltration

Description: There are two cases of dust infiltration: first, the surface compactness of the selected filter material is not enough, which leads to a large amount of dust entering the filter material directly and staying, and the resistance of the filter material increases; Secondly, generally speaking, in the process of bag operation, dust will more or less enter the filter material. Generally, it takes two and a half to three years for dust infiltration to be serious.

Solution: change the package

Cause 1 1: The thermal shrinkage of the filter bag of xian county Guardian Environmental Protection Equipment led to too small deformation during injection.

Description: After using for a period of time, the filter bag will shrink in different degrees. Some filter bags may be tied to the cage bone, and the deformation caused by injection is too small to shake off the dust. The airbag resistance is high.

Solution:

1. Forced ash removal; At the same time, the purpose of limiting the expansion of the bag body can be achieved.

2. Replace the new cloth bag (you don't need to pay attention to the size of the bag when buying a new cloth bag)