Bottom-reinforced filter bag ash removal method with variable inner channel and filter device

Abstract

The invention discloses a bottom-reinforced filter bag ash removal method with a variable inner channel and a filter device, which are used for enhancing filter bag ash removal. The method comprises the following steps: introducing deashing airflow into the filter bag of which the cross section area of the inner channel is reduced along the direction from the filter bag opening to the bottom of the filter bag to flow into the bottom of the filter bag, and continuously reducing the cross section area of the inner channel of the filter bag to ensure that the filter bag continuously compresses the deashing airflow and improve the impact pressure and impact speed of the deashing airflow. The device comprises a cage framework and a framework pressing sleeve, wherein a cloth bag is arranged outside the cage framework in a sleeving manner and is attached to the cage framework; the cage framework comprises cohesion connecting pieces and at least three V-shaped steel rings, wherein one end of each V-shaped steel ring is fixed on the cohesion connecting piece to form a conical inward concave cavity; and a cloth bag tensioning sliding block is arranged in the conical inwards-concave cavity, wherein one end of the cloth bag is arranged on the framework pressing sleeve in a sleeving mode, the other end of the cloth bag is folded in the cloth bag tensioning sliding block; the cloth bag is embedded into the conical inwards-concave cavity along with the cloth bag tensioning sliding block and fastened by one end of the V-shaped steel rings.

Description

Technical field [0001] The invention relates to a dust removal method and a filter device for a bag bottom reinforced filter bag 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 The footprint and manufacturing cost of the device. Background technique [0002] Bag filter is the main and key equipment for the treatment of flue gas particulate matter. It has been industrially used for nearly a hundred years and has a great demand. Improvements in increasing the collection area per unit volume and enhancing the ash removal effect will produce a greater social economy benefit. [0003] Most of the existing bag filter adopts pulse cleaning, and there is also a small amount of atmospheric back blow cleaning. Both cleaning methods use the cleaning air flow. Its main function is to change the normal operation state and cause filtration. The instan...

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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 speed of the upper part of the dust removal airflow in the filter bag is relatively large, 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 high moisture content in the flue gas, and the phenomenon of particulate matter sticking to the filter bag often occurs at the bottom of the filter bag, which affects the dust removal effect and the normal operation of the equipment

[0006] (2) Generally, the filter bag filter area of ​​the bag filter is large, and the equipment manufacturing cost, installation and civil construction cost of the bag filter are relatively high. The existing filter bag is in the form of a straight cylinder, and the internal volume space of the filter bag is still relatively large, which is not used. get up, waste

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