Ceramic membrane for treating dusty, poisonous and high-temperature gases and preparation method thereof

Abstract

The invention belongs to the field of inorganic nonmetal materials and particularly relates to a ceramic membrane for treating dusty, poisonous and high-temperature gases and a preparation method thereof. 90-99% by mass of ceramic membrane supporting body and 1-10% by mass of catalyst are prepared into a complex, and then, a ceramic membrane coating is spray coated on the outer surface of the complex to prepare the ceramic membrane. The catalyst is an SCR (Silicon Controlled Rectifier) denitration catalyst, and the ceramic membrane supporting body is prepared from aggregate, a high temperature binder, a pore forming agent, a forming assistant and a release agent. The preparation method is as follows: firstly, preparing the ceramic membrane supporting body, and then, compounding the catalyst in the pore of the supporting body, spray coating a layer of ceramic membrane coating material on the outer surface of the supporting body, and carrying out heat treatment to prepare a ceramic membrane material. The prepared ceramic membrane material has the advantages of high filtering precision, high permeability and erosion resistance and has dust removal and catalysis functions, thereby integrating denitration with dust removal and changing the traditional mode of gradual operation of independent operation units.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a ceramic membrane for treating dust-containing toxic high-temperature gas and a preparation method thereof. Background technique [0002] Traditional dust removal technologies mainly include cyclone dust removal, bag dust removal, electrostatic dust removal, etc. These technologies have made great contributions to the control of dust emissions, but for the purification of high-temperature hot gases, traditional dust removal technologies are difficult to achieve, such as cyclone dust removal. The problem of poor separation accuracy; the pressure loss of electrostatic dust removal technology is small, but the equipment is huge, the investment is high, the dust removal efficiency is low, and it is selective to dust. Although the bag filter has high particle removal efficiency, it has poor temperature resistance (maximum service temperature 280°C) and easy...

AI Technical Summary

Problems solved by technology

[0003] At present, for the purification of high-temperature toxic and harmful gases, the existing treatment technology is only the integration of the system. The desulfurization, denitrification, and dust removal are usually independent operating units, which need to go through their own desulfurization reactor, denitration reactor and dust removal filter. Complete, especially because the hot catalyst requires a certain start-up temperature, and is limited by the operating temperature of the dust removal technology (usually lower than 300 ° C), the denitrification process is usually set before the dust removal process, and the dust-containing gas will wash, corrode, and poison the catalyst. The effect is very significant, resulting in the attenuation and failure of the catalytic function, which has a serious impact on the operating efficiency and cost of the entire purification system

In addition, for the waste incineration industry, the current method is to water-cool the high-temperature dust-containing toxic gas, and then use the bag to remove dust. This method not only wastes a lot of sensible heat through cooling and dust removal, but also produces secondary pollution through the water-cooling process.

Moreover, this method can only be used to remove dust particles in high-temperature dust-containing toxic gases, and the removal effect of nitrogen oxides, dioxins and other toxic components is not obvious