Preparation method of silicon carbide asymmetric composite filter tube membrane with controllable aperture, and device

Abstract

The invention provides a preparation method of a silicon carbide asymmetric composite filter tube membrane with controllable aperture, and a device, and belongs to the technical field of gas-solid separation. The method comprises the following steps: firstly, crushing and grinding raw materials, then carrying out mixing, carrying out pelletizing and mixing, carrying out isostatic pressing, carrying out drying, then carrying out firing, and carrying out plasma spraying, wherein the used raw materials are silicon carbide, kaolin, aluminum oxide, a pore-forming agent, a sintering aid and a binder. The device applying the prepared filter tube membrane comprises an air outlet, a pressure transmitter opening, an air bag slag discharging opening, a pulse nozzle, an air inlet, a sewage dischargingport, the silicon carbide asymmetric composite filter pipe membranes and a blowback opening. 20-960 silicon carbide filter tubes are installed in a filter chamber in the middle of the device; dust-containing flue gas enters the filter chamber from the air inlet; and clean gas filtered by the silicon carbide filter pipe enters an internal pipeline of the device from the pulse nozzle and is finallydischarged from the air outlet. The silicon carbide asymmetric composite filter tube membrane has the advantages of excellent high-temperature corrosion resistance and thermal shock resistance, goodfiltration performance, high filtration precision, long service life and the like.

Description

technical field [0001] The invention relates to the technical field of gas-solid separation, in particular to a method and device for preparing a silicon carbide asymmetric composite filter tube membrane with controllable pore size. Background technique [0002] High-temperature dust removal ceramic filter technology is a new technology in the field of environmental protection dust removal. Compared with conventional cyclone dust removal, electrostatic dust removal and other technologies, this technology is more suitable for removing dust in high-temperature (above 600°C) and corrosive industrial gases, and can be widely used in coal gasification process, coal-to-oil, power boiler smoke dust removal Treatment, catalytic fluidized bed process, dry dust removal in the production of polypropylene and polyethylene, purification and dust removal of high-temperature flue gas such as metallurgical smelting furnaces, waste incinerators, power plant boilers, calcium carbide gas furna...

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation of porous silicon carbide ceramics is mainly made by combining silicon carbide particles, pore-forming agents, and inorganic high-temperature binders at high temperatures. The porosity of the material is determined by the type, dosage, and dispersion of the pore-forming agent Effect, controlled by various factors such as the particle size and gradation of silicon carbide particles, the porosity of the porous silicon carbide ceramic material is not high and fluctuates greatly, which limits the application and development of porous silicon carbide ceramics in the filtration industry

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