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 and an inclined part connected to each other in sequence, and the inlet part, the neck The height of the longitudinal section of the slope and the inclined portion gradually decreases, and the gas ejector is arranged transversely relative to the filter tube of the filter device. By improving the shape of the gas ejector and its arrangement in the pulse back-blowing and dust-cleaning device, the back-blowing airflow can no longer be concentrated at the center, but the filter tubes corresponding to the gas ejector can be relatively smooth. Uniform backflushing enables the filter tube to be cleaned evenly and thoroughly. In this way, the pressure of back blowing and dust cleaning can be reduced, and the impact of back blowing gas on the thermal shock and vibration of the filter tube will also be reduced, prolonging the service life 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] High-temperature gas dedusting is a technology that directly separates gas from solid under high-temperature conditions to achieve gas purification. The ceramic filter used in the high-temperature gas dedusting process is recognized as the most promising high-temperature gas purification equipment, and has broad application prospects in clean coal combustion power generation, petroleum processing and environmental protection. [0003] When filtering, the dust particles in the gas deposit on the outer surface of the filter tube to form a filter cake, and the filtration pressure drop increases. It is necessary to periodically blow back through high-pressure gas pulses to remove the filter cake on the outer surface of th...

AI Technical Summary

Problems solved by technology

[0005] For the existing pulse blowback cleaning device, because the shape of the existing gas ejector is conical, the length of the "primary jet (that is, the amount of gas ejected from the nozzle)" when the nozzle is sprayed is limited, and the energy is concentrated In the position of the central axis, the blowback effect of the filter tube outside the central axis is poor

At the same time, the "primary jet" and "secondary jet (that is, the ejected gas volume of the surrounding gas ejected by the gas ejector)" are not uniform when mixed at the throat of the gas ejector, and the energy exchange and transfer efficiency is low, making During the backflushing process, the peak pressure in the filter tube is low, which affects the cleaning strength and cleaning efficiency, making the cleaning uneven and incomplete

In this case, due to the poor deformation resistance of the ceramic filter tube, the backflush pressure is mainly concentrated at the axial position, which makes the filter tube at the axial position prone to fatigue fracture, thus making the entire filter invalid.

[0006] It can be seen that the cleaning effect of the pulse back-blowing soot cleaning device in the prior art is relatively poor. The inventor has relied on years of experience and practice in related industries to propose a pulse back-blowing soot cleaning device for filters and its gas Ejectors to overcome existing technical deficiencies

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