Double-layer filter bag for flue gas treatment

Abstract

The invention relates to the environmental protection field, in particular to a double-layer filter bag for flue gas treatment. The double-layer filter bag is made from a double-layer fabric, which includes an outer filter cloth, an inner filter cloth and connecting lines connecting the inner filter cloth and the outer filter cloth. Gas pressure sensors are arranged between the inner filter clothand the outer filter cloth. The double-layer filter bag provided by the invention not only makes full use of the pressure of flue gas itself, but also increases the filtering efficiency, at the same time does not cause excessive resistance, also eliminates a complex filter bag cage structure, and only uses an ordinary structure filter bag frame. The filter bag also can simply and conveniently judge whether holes exist in the filter bag, and manual tour inspection is not needed. At the same time, the making process of the filter bag provided by the invention is simple, has high production efficiency, and is convenient for mass industrial production.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a double-layer filter bag for flue gas treatment. Background technique [0002] Bag filter, electrostatic precipitator and Venturi scrubber are internationally recognized three major dust removal equipment for particle control. Under different working conditions, the three major dust removal equipment have their own advantages and disadvantages. Among them, the bag filter is the dust collector with the widest application range, the strongest adaptability and the highest purification efficiency among the three major dust removal equipment. [0003] Existing filter bags usually use a single layer of filter cloth to filter. This kind of filter bag is easy to process, but the filtering effect is average, and the service life is not long. When there are holes in the filter bag, manual inspection is required, the workload is heavy and it is not easy to find. This directly aff...

AI Technical Summary

Problems solved by technology

However, this double-layer filter bag requires a complex cage structure to be located between the inner bag body and the outer bag body, and the force between the inner bag body and the outer bag body is not uniform, and the installation is not convenient

The utility model patent with the patent application number CN201620224398.1 discloses a filter bag cage for double filter bags, and the utility model patent with the patent application number CN201720763534.9 discloses a wear-resistant double-layer filter bag. Each layer of filtration needs to design a filter bag cage located between the inner bag body and the outer bag body, the structure is complex and inconvenient to install

The utility model patent with the patent application number 201520019161.5 discloses a double-layer structure integrated functional filter bag for denitrification and dust removal. The filter bag includes an outer dust removal filter bag and an inner denitrification filter bag. The split structure can overcome the problem that the service life of the existing integrated functional filter dust removal function and denitrification function is not consistent, resulting in the waste of one function.

However, this split structure also makes the force between the inner and outer bags uneven, and it is also necessary to install a filter bag cage between the inner and outer bags during installation and use. The structure is complicated and inconvenient to install.

Generally speaking, the filter bags with double-layer structure in the prior art are basically designed with complex frame structures to support the inner and outer layers of the bag separately, or to tightly fit the multi-layer filter materials together, but this will significantly increase the cost. Large filtration resistance, greatly reduced filtration efficiency

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