Pulse back-blowing soot 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 part and a bow part connected to each other in sequence, and the inlet part, the neck part The heights on the longitudinal sections of the arches and bows are sequentially changed from large to small and then large, and the gas ejector is arranged laterally relative 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. [0003] In chemical industry, petroleum, metallurgy, electric power and other industries, high temperature dusty gas is often produced. Because these different processes need to recover energy and meet environmental protection emission standards, it is necessary to remove dust from these high-temperatu...

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 severe the vibration of the filter tube. The filter tube is damaged or even broken due to thermal shock fatigue

[0009] In addition, during the pulse back blowing, after the transient energy generated by the back blowing air flow enters the filter tube, during the process of energy transfer along the open end of the filter tube to the closed end of the end, the back blowing air flow continuously flows from the filter tube to the closed end of the filter tube. Leakage in the pores of the porous channel makes the energy dissipate continuously during the transfer process, resulting in a great difference in the cleaning effect between the lower part and the upper part of the filter tube. The phenomenon of complete dust removal will cause the dust layer between the filter tubes to bridge, which will easily cause the filter tubes to fail

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