Filter device for separating gas and solid

Abstract

The invention discloses a filter device which not only can prevent the collision of outer-filter filter bags, but also can improve the ash clearing effect for the filter bag, and is used for separating gas and solid. The filter device comprises a box body, wherein a porous plate is installed in the box body, a plurality of filter units are installed on the porous plate, each filter unit comprises the outer-filter filter bag with an open upper end and a closed lower end, the upper end of the filter bag is installed on the porous plate, an original gas chamber is arranged below the porous plate in the box body, a purified gas chamber is arranged above the porous plate in the box body, the box body is provided with a gas inlet which is communicated with the original gas chamber and an exhaust port which is communicated with the purified gas chamber, a back-flushing device for clearing the ash of each filter bag through the back-flushing airflow is arranged above the box body, the lower end of each filter bag is connected with an elastic drawing device which is used for stretching the filter bag in the axial direction, and the elastic drawing device is connected and elastically tensioned between the filter bag and a fixed component which is arranged below the filter bag and keeps a set distance from the porous plate. By adopting the filter device, the service life of the filter bag can be prolonged, and the ash clearing effect for the filter bag can be improved.

Description

technical field [0001] The invention relates to a filter device for gas-solid separation. Background technique [0002] In the field of gas-solid filtration and separation, external filter bags are commonly used filter elements. The so-called "outer filter type" refers to the filter method in which the gas to be filtered penetrates from the outside of the filter bag to the inside of the filter bag to achieve gas-solid separation and purification. The filter device using an external filter bag generally has the following structure: the filter device includes a box body, and an orifice plate is installed in the box body, and a plurality of filter units are arranged on the orifice plate, and each filter unit includes an open upper end and a closed lower end. External filter bag, the upper end of the filter bag is installed on the orifice plate, the lower end of the filter bag is suspended, and the inside of the filter bag is also equipped with a bag cage to support the filter ...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantages of the above-mentioned filter device are as follows: First, the material used in the filter bag itself has a relatively large pore size, and when filtering, it mainly relies on the filter cake layer formed by the dust gradually accumulated on the surface of the filter bag to ensure a certain filtration efficiency (i.e. Dust removal rate), and the dust on the surface of the filter bag can easily enter the pores of the filter bag material to cause plugging. Therefore, the backflushing device usually has to act on the high-pressure recoil airflow of 0.1 to 0.8 MPa for the filter bag, which not only consumes energy High, and the cleaning effect of the recoil airflow is not ideal; second, the filter bag and the bag cage are caused to rub against each other when the high-pressure recoil airflow is cleaned, which leads to the wear of the filter bag over time; The filter bag swings back and forth to cause the filter bags to collide with each other, resulting in damage to the filter bag and leakage at the seal between the filter bag and the orifice plate

Images