Pulse back-blow dedusting device and gas injector thereof, and filter device

Abstract

The invention provides a pulse back-blow dedusting device and a gas injector thereof, and a filter device. The gas injector used by the pulse back-blow dedusting device and the filter device includes an injector body, and the injector body includes an entrance part, a neck part, and an arch part connected with each other in order. The widths of the entrance part, neck part, and arch part in the longitudinal section are increased at first then decreased, and the heights of the entrance part, neck part, and arch part in the longitudinal section are gradually decreased. The gas injector is horizontally arranged relative to filter pipes of the filter device. The filter pipes corresponding with gas injector are back blown uniformly by means of improving the shape of gas injector and installation mode of the gas injector in the pulse back-blow dedusting device, and the filter pipes are dedusted uniformly and thoroughly by means of improving the air flow distribution blowing the gas injector. The back-blow dedusting pressure is reduced, the shock of the filter pipes is reduced, the risks of the thermal shock and fatigue break are reduced, the dust layer bridging between the filter pipes is avoided, and the invalidation of the filter pipes is avoided.

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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