Working principle of mechanical vibrating bag filter;
The mechanical vibrating bag dust collector comprises a dust collector shell, a ceiling, a vibrating rod and a cloth bag, wherein the middle part of one side of the dust collector shell is provided with an air inlet, and the upper part of the other side is provided with an air outlet; A dust cleaning door is arranged at the bottom of the vacuum cleaner shell between the air inlet and the air outlet; A flower board is arranged in the vacuum cleaner and installed between the air inlet and the air outlet to divide the vacuum cleaner into a dust removal area and an exhaust area; The vibrating rod and the upper end of the bag are installed on the flower board; The structure is crank mechanism, rapping and swinging rod. The vibrating rod and the lower end of the cloth bag are provided with the vibrating rod, which is inserted into the vibrating rod, the upper part of the vibrating rod is fixed on the wall of the vacuum cleaner through two swinging rods, and one side of the vibrating rod is connected with the crank mechanism. The mechanical vibrating bag dust collector has good dust removal effect and will not cause secondary pollution to the environment. The electric push rod device installed above the air inlet of the cloth bag chamber is used to open the air inlet of the blowback pipe, and when the cloth bag chamber is in a negative pressure state, a certain amount of natural wind is sucked in, so that the cloth bag vibrates and the purpose of cleaning dust is achieved.
Working principle of pulse bag filter;
After the dusty airflow enters the lower box from the air inlet, it partially settles. When the dust floats slightly, it will be blocked by the filter bag. The purified air passes through the filter bag, enters the upper box through the venturi tube and is discharged from the air outlet. There is more and more dust attached to the filter bag. When the resistance is within a limited range (generally 80- 1.20mm water column), the dust attached to the outer wall of the filter bag shall be removed. Dust removal means that the control valve is triggered according to the control cycle sequence, and the pulse valve is opened, so that the compressed air in the airbag is ejected from the blowpipe hole (primary air), and the surrounding air (secondary air) several times that of the primary air is introduced into the filter bag through the Venturi tube.
Working principle of air box pulse bag filter
The main body of air box pulse bag filter is divided into several box areas, each box has 32, 64 and 96 filter bags, and each box has 32, 64 and 96 filter bags. ...
There is a poppet valve driven by a cylinder on the outlet pipeline on the side of the box body. When the dust collector filters the dusty gas for a certain time (or the resistance reaches a preset value), the ash cleaning controller sends a signal. The poppet valve of the first chamber begins to close and cut off the filtered airflow; Then open the air chamber pulse valve, and flush compressed air greater than 0.4MPa into the clean air chamber to remove the dust on the filter bag; When this action is completed, the poppet valve is reopened, so that the chamber can be filtered again, and all the ash cleaning actions are completed one by one according to the above procedures.
The gas box pulse dust collector uses the box-dividing chamber to clean the dust. Clean up the ash, should be isolated one by one, in turn. The pulse and ash cleaning cycle of each chamber are automatically and continuously carried out by the ash cleaning program controller according to the preset program, which ensures the ash cleaning effect of compressed air. The whole box body is designed with the structure of import and export main pipe, and the ash hopper can extend below the import main pipe, so that the dust-containing flue gas can directly enter the expanded ash hopper to achieve the effect of pre-dust removal. Therefore, the air box pulse bag filter can not only deal with dust-bearing gas with general concentration, but also deal with dust-bearing gas with high concentration.
Design and selection of bag filter
Determine the treatment air volume of bag filter
1). The air volume of the bag filter here refers to the air volume under working conditions. If the given air volume is the standard temperature and pressure, it will be converted into the air volume under working conditions.
2) Determine the dust emission concentration of the bag filter.
First of all, it must meet the national standards. Some cities, regions and enterprises have lower requirements for concentration, and in many cases, they have stricter requirements for dust concentration: toxic dust; Turbine inlet air purification; Waste incineration tail gas; Gas purification of large blast furnace.
3). Determine the working temperature.
The upper limit should be lower than the allowable long-term service temperature of the selected filter material, and the lower limit should be higher than the dew point temperature 15 ~ 20℃. When the flue gas contains acid gas, the dew point temperature is high, so special attention should be paid to the design of dust collector.
4). The selection of cleaning method for bag filter is based on:
The difficulty of dust cleaning; Dust concentration in flue gas.
For furnace flue gas with sticky and fine dust, or flue gas with high dust concentration, it is appropriate to adopt the ash cleaning method with strong ash cleaning ability or weak ash cleaning ability, and in principle, the strong ash cleaning method should be preferred.
5). Bag filter selects bag filter material for dust removal.
Full consideration should be given to:
A. Physical and chemical properties of dusty gas
B. Physical and chemical properties of dust
C. cleaning method of vacuum cleaner.
6). Determine the filtering wind speed of the bag filter.