Pulse backflushing cleaning device and its gas ejector and filter device

Abstract

The invention provides a pulse back-blowing dust cleaning device, a gas ejector and a filter device thereof. The gas ejector used by the pulse back-blowing soot cleaning device and the filter device includes an ejector body, and the ejector body includes an inlet part, a neck and an arched part connected to each other in sequence, and the inlet part, the neck The width of the longitudinal section of the portion and the arched portion first increases and then decreases, and the height gradually decreases, and the gas ejector is arranged transversely to the filter tube of the filter device. By improving the shape of the gas ejector and its setting in the pulse back-blowing soot cleaning device, the filter tubes corresponding to the gas ejector can be blown back more uniformly, improving the efficiency of blowing into the gas ejector. The airflow distribution condition makes the filter tube get even and thorough cleaning. In this way, the pressure of back blowing and dust cleaning can be reduced, the vibration of the filter tube can be reduced, and the risk of thermal shock and fatigue fracture can be reduced; the second is that it can avoid the bridging of the dust layer between the filter tubes and avoid the failure of the filter tube.

Description

technical field [0001] The invention belongs to the technical field of gas-solid separation, and relates to a filter device, in particular to a pulse back-blowing soot cleaning device in the filter device and a gas ejector thereof. Background technique [0002] With the deterioration of air quality, more and more attention has been paid to the development of filter materials for high-temperature exhaust gas filtration and emission. In recent years, a large amount of high-temperature industrial waste gas has caused serious pollution to the atmospheric environment. Topics such as "air quality", "smog", and "PM2.5" have rapidly heated up and become hot issues of global concern. Therefore, the development and optimization of high temperature dust removal technology is extremely important. [0003] In chemical industry, petroleum, metallurgy, electric power and other industries, high temperature dusty gas is often produced. Since these different processes need to recover energy...

AI Technical Summary

Problems solved by technology

[0008] First of all, in order to effectively clean the filter tube at the edge position inside the ejector, in actual operation, it often needs a back-flush cleaning pressure that is about twice the operating pressure of the filter. The high pressure of back blowing and cleaning will cause the filter tube to be subjected to a great impact force, which will easily cause the filter tube to vibrate during this process. The higher the back blowing and cleaning pressure, the more violent the vibration of the filter tube. The filter tube is damaged or even broken due to thermal shock fatigue

[0009] In addition, during pulse blowback, since the high-pressure and high-speed blowback airflow will inject clean gas from around the opening end of the filter tube into the inside of the filter tube, it is easy to form a "negative pressure zone" near the open end. There is dust outside the filter tube being entrained to the surface of the filter tube in this area. If the dust cannot be completely cleaned, it will cause the dust layer between the filter tubes to bridge, which will easily cause the filter tube to fail

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