Dust bag (filter bag) cannot have perfect performance in meeting the requirements of temperature, humidity and other conditions such as chemical corrosion.
Dust bag selection introduction
As mentioned before, various dust bags (filter bags) cannot have perfect performance in meeting the requirements of temperature, humidity, and chemical corrosion and other conditions. Therefore, the correct choice of dust bag (filter bag) will become an important part of the bag filter to fully exert its performance. Should choose according to the following principle.
Select dust bag (filter bag) according to the nature of dust
First, according to the results of the analysis of the filtered gas and dust properties, and with reference to the performance of various dust bag (filter bag), in addition, the design of the filter should meet the performance of the dust bag (filter bag) fiber used. In order to better and more fully develop the performance of the dust bag (filter bag), it is necessary to consider designing auxiliary equipment such as gas cooling devices and pre-dust removal devices.
Dust bags (filter bag) short life, easy to damage and other shortcomings, from the use of the dust bag (bag) analysis results, most of the conditions in the dust bag (filter bag) performance conditions under the conditions There are many examples of the short life of the dust bag (filter bag) caused by the use of heat, especially due to the influence of high temperatures. Because of variations in management, the gas temperature tends to change frequently over the heat-resistant temperature of the dust bag (filter bag) for a long period of time. Therefore, it is preferable to use a dust bag (filter bag) with a relatively high heat resistance.
When the gas and dust are acidic and neutral, a dust bag (filter bag) made of polyester and polypropylene, which is resistant to most inorganic acids and organic acids, is preferably used. However, care must be taken that the polypropylene strength deteriorates when the flue gas temperature exceeds 80°C. When the polyester dust bag (filter bag) filters alkaline gas, due to the influence of temperature and humidity conditions, it will be decomposed with water, resulting in a significant drop in the strength of the dust bag (filter bag). Therefore, in this case, nylon dust bag (filter bag) must be used instead. There is a dust filter bag (polytetrafluoroethylene, etc.) due to the price and other aspects of the scope of application to be subject to certain restrictions, so be careful when choosing. Dust bag (filter bag) can not have perfect performance in meeting the requirements of temperature, humidity, and chemical corrosion and other conditions.
During the trial operation of the new dust bag, special attention should be paid to checking the following points:
a. Should pay attention to the presence of condensation in the bag room, whether the ash drainage system is unblocked, and prevent blockage and corrosion from occurring. When the accumulation of dust is severe, the production of the host machine will be affected.
b. If the filter bag is installed, if there is a bag falling, loosening, or abrasion after use, it can be judged by visually observing the emission of the chimney after it is put into operation.
c. The processing air volume and the pressure and temperature of each test point are in accordance with the design.
d. Rotational direction, speed, bearing vibration, and temperature of the fan.
e. Adjustment of cleaning cycle and cleaning time. This work is an important factor in the dust capture performance and operating conditions. If the cleaning time is too long, the attached dust layer will be washed off and 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 is not cleared, the filter operation will be resumed, and the resistance will be quickly recovered and gradually increased, affecting its use results.