Bag dust collector for coal burning boiler and furnace

Abstract

The present invention discloses one kind of bag dust collector for coal burning boiler and furnace. In case that overheated fume is produced during starting the coal burning boiler or furnace and unstable work condition, the bag dust collector of the present invention can start the by-pass fume treating system inside the dust collector to prevent high temperature fume from passing through the filtering bag and to protect the filtering bag from damage. After the work condition is restored normally, the off-line valve over the filtering bag is opened automatically while the by-pass valve is closed, so that the fume is filtered in the filtering bag. The present invention can protect the filtering bag effectively.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to the technical field of high temperature-resistant bag type dust collectors. Background technique [0002] In the prior art, a bag filter is a dust removal device that uses a bag filter unit made of fiber braid to capture solid particles in dusty gas. Its working principle is: solid particles in dusty gas bypass the filter When the fiber collides with the fiber due to the inertial force, it is intercepted, while the fine particles (with a particle size below 1 micron) in the solid particle are impacted by the gas molecules and constantly change the direction of motion. Through the path, the fine particles collide with the fibers and are separated. Due to this working principle, the dust removal efficiency of the bag filter is far superior to other types of dust collectors, and the dust concentration of the flue gas treated by the bag filter is generally lower than 5...

AI Technical Summary

Problems solved by technology

But even in this way, the bag filter will encounter some problems when dealing with high-temperature flue gas. These problems are: coal-fired boilers or kilns generally use firewood and fuel oil when starting the furnace. Fire tiny charcoal particles and fuel oil droplets enter the baghouse of the bag filter, these tiny fire charcoal particles and fuel oil droplets can directly act on the filter bag made of fiber woven fabric in the baghouse, making the filter Partial burning of the bag, or even the entire filter bag, will cause the filter bag to fail. Even if unburned fuel droplets adhere to the surface of the filter bag, it will cause the bag to stick to the surface of the filter bag, making it difficult to clean the filter bag and become invalid.

But the disadvantages of this method are: the opening and closing process of the three-way valve takes a long time, the sensitivity is poor, the sealing is poor, it is easy to cause large internal leakage, and it is difficult to realize automatic control, and at the same time bypass the bypass of the bag filter The flue covers a large area, consumes a lot of materials, and has high manufacturing and installation costs

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