Precautions for the operation of bag filter

The operation of the bag filter can be roughly divided into trial operation and daily operation. First of all, during the trial operation, the single component of the system must be checked, and then the adaptive operation must be carried out, and part of the performance test must be carried out. In daily operation, necessary inspections should still be carried out, especially the inspection of the performance of the bag filter. Attention should be paid to the impact of changes in the load on the host equipment on the performance of the dust collector. After the machine is started, pay close attention to the working conditions of the bag filter and make relevant records.

A test run

During the trial operation of the new bag filter, special attention should be paid to check the following points:

1. The rotation direction, speed, bearing vibration and temperature of the fan.

2. Whether the processing air volume and the pressure and temperature of each test point are in line with the design.

3. The installation of the filter bag, whether there is any bag drop, loose mouth, wear after use, etc., can be judged by visual inspection of the chimney emission after it is put into operation.

4. Pay attention to whether there is condensation in the bag room and whether the ash discharge system is smooth. Prevent blockage and corrosion from occurring. Serious ash accumulation will affect the production of the main engine.

5. The adjustment of the cleaning cycle and the cleaning time is an important factor affecting the dust-catching performance and operating conditions. If the cleaning time is too long, the attached dust layer will be removed, which will become the cause of leakage and damage of the filter bag. If the cleaning time is too short and the dust on the filter bag has not yet been removed, the filtration operation will be resumed, which will quickly restore the resistance and gradually increase the resistance, which will ultimately affect its use effect.

The time interval between two cleanings is called the cleaning cycle. Generally, it is hoped that the cleaning cycle should be as long as possible, so that the dust collector can operate under economical resistance conditions. Therefore, it is necessary to carefully study the dust properties, dust concentration, etc., and determine the cleaning cycle and time according to different cleaning methods, and adjust in the trial operation to achieve better cleaning parameters.

At the time of starting operation, there are often unexpected situations, such as abnormal temperature, pressure, moisture, etc., which will cause damage to the new device.

The rapid change of gas temperature will cause the deformation of the fan shaft, resulting in an unbalanced state, and vibration will occur during operation. Once the operation is stopped, the temperature drops sharply, and vibration occurs when it is restarted. It is best to choose different types of fans according to the gas temperature.

The quality of the equipment's trial operation directly affects whether it can be put into normal operation. If it is not handled properly, the bag filter is likely to lose its effectiveness quickly. Therefore, the trial operation of the equipment must be careful and prudent.

Two daily operations

In the daily operation of the bag filter, due to some changes in the operating conditions or some failures, the normal operation and performance of the equipment will be affected. Regular inspections and appropriate adjustments are required to prolong the filter life. The life of the bag, reducing power consumption and recycling useful materials. Issues that should be noted are:

1. Operation record

Each ventilation and dust removal system must be installed and equipped with necessary test instruments, which must be measured regularly in daily operation and recorded accurately. , current and other values and changes to judge, and timely discharge the fault to ensure its normal operation.

The problems found through the records are: the working conditions of the cleaning mechanism, the working conditions of the filter bags (broken, pasted bags, clogging, etc.), and the changes in the system air volume.

2. Fluid resistance

The U-type differential pressure gauge can be used to judge the operation status: if the pressure difference increases, it means that the filter bag is blocked, there is condensation on the filter bag, the ash cleaning mechanism fails, the ash hopper accumulates too much dust to block the filter bag, and the gas flow increases, etc. condition. A drop in differential pressure can mean a broken or loose filter bag, a blocked inlet pipe, or a closed valve. There is leakage between the box or each sub-chamber, and the fan speed slows down.

3. Safety

The bag filter should pay special attention to taking measures to prevent combustion, explosion and fire accidents. When dealing with combustion gas or high temperature gas, incompletely burned dust, sparks, combustible and explosive gases, etc. often enter the system. Some dusts have the property of spontaneous combustion or electrification. At the same time, most filter materials are also All of them are easy to burn, and friction is easy to generate static electricity. Under such operating conditions, there is the danger of burning and explosion accidents, and the consequences of such accidents are often very serious. Fire and explosion-proof measures should be well considered, such as:

(1) A combustion chamber or a spark trap is set in front of the dust collector to completely burn the incompletely combusted dust and gas or trap the sparks.

(2) Take measures to prevent the accumulation of static electricity, ground each part with conductive materials, or add conductive fibers when the filter material is manufactured.

⑶ Prevent the accumulation or accumulation of dust, so as to avoid the spontaneous combustion and explosion of dust.

⑷ Before people enter the bag room or pipeline for inspection or maintenance, be sure to ventilate and ventilate to prevent CO poisoning.