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 inclined part connected with each other in order. The heights of the entrance part, neck part, and inclined part in the longitudinal section are gradually decreased, and the gas injector is horizontally arranged relative to filter pipes of the filter device. The back-blow airflow does not concentrate in the central position 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 corresponding with gas injector are back blown uniformly, so that the filter pipes are dedusted uniformly and thoroughly. The back-blow dedusting pressure is reduced, the influence of back-blow gas on the thermal shock and shock of the filter pipes is reduced, and the usage life of the filter pipes is prolonged.

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 ash cleaning device in the filter device and a gas ejector thereof. Background technique [0002] High temperature gas dust removal is a technology that directly separates gas and solid under high temperature conditions to achieve gas purification. The ceramic filter used in the high-temperature gas dust removal 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 are deposited on the outer surface of the filter tube to form a filter cake, and the filter pressure drop increases. It is necessary to periodically pass high-pressure gas pulse back-blowing to remove the filter cake on the outer surface of the ...

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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