A kind of dust cleaning method and filter device of bag bottom reinforced filter bag with variable inner channel

Abstract

The invention discloses a bag-bottom-enhanced dust-cleaning method and a filter device with a variable inner channel, which are used for strengthening the dust-cleaning of the filter bag. Method: The cross-sectional area of ​​the cleaning air flow into the inner channel decreases along the direction from the opening of the filter bag to the bottom of the filter bag, and flows to the bottom of the filter bag, continuously reducing the cross-sectional area of ​​the inner channel of the filter bag to continuously compress and clean the filter bag. Ash airflow and increase the impact pressure and impact velocity of the ash-cleaning airflow. The device includes a cage frame and a frame pressing sleeve. A cloth bag is set on the outside of the cage frame and the bag is attached to the cage frame. The cage frame includes a cohesive connector and at least 3 V-shaped steel circles, one end is fixed to the cohesive connector and A conical inward concave cavity is formed, and the other end is folded in the skeleton pressure sleeve, and a cloth bag tensioning slider is arranged in the conical inward concave cavity, one end of the cloth bag is set on the skeleton pressure sleeve, and the other end is folded in the cloth bag The tight slider is embedded in the tapered inward concave cavity along with the bag tensioning slider and is fastened by one end of the V-shaped steel garden.

Description

technical field [0001] The invention relates to a bag-bottom enhanced filter bag dust removal method and a filter device with a variable inner channel for a bag filter, which can enhance the dust removal effect and uniformity, increase the area of ​​the filter bag per unit volume, and reduce the bag dust removal device footprint and manufacturing cost. Background technique [0002] The bag filter is the main and key equipment for the control of flue gas particulate matter. It has been used in industry for nearly a hundred years and is in great demand. Improvements such as increasing the collection area per unit volume and enhancing the effect of cleaning dust will produce greater social and economic benefits. benefit. [0003] Most of the existing bag-type dust collectors use pulse cleaning, and there is also a small amount of atmospheric back-blowing cleaning. Both cleaning methods use the cleaning airflow. Instantaneous positive pressure and vibration in the bag, the dus...

AI Technical Summary

Problems solved by technology

[0005] (1) Since the filter bag is in the form of a straight tube with the same upper and lower cross-sectional areas, after the dust removal airflow is introduced, the axial velocity of the upper part of the dust removal airflow in the filter bag is relatively high, and when the axial direction moves downward, a part of the dust removal airflow passes through the filter bag, The flow of dust-cleaning air is reduced, the axial velocity of dust-cleaning airflow is reduced, the speed of pressure rise in the filter bag is reduced, and the effect of cleaning dust at the bottom of the filter bag is worse than that in the middle

In addition, the dust removal air flow at the lower part of the filter bag is small, while the cross-sectional area of ​​the channel inside the filter bag does not change, resulting in a drop in the peak pressure inside the filter bag, especially when the particles are easy to absorb moisture, the moisture content of the flue gas is large, and the length of the filter bag is large. Cleaning effect is poor

For example, the long filter bag dust collector used for waste incineration flue gas treatment has a large moisture content in the flue gas, and particles often appear at the bottom of the filter bag to stick to the filter bag, which affects the dust removal effect and the normal operation of the equipment

[0006] (2) Generally, the filter area of ​​the filter bag of the bag filter is large, and the equipment manufacturing cost, installation and civil engineering cost of the bag filter are relatively high. get up, waste

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