Magnetically separable and recyclable iron oxide SCR denitration catalyst and application method thereof

Abstract

The invention discloses a magnetically separable and recyclable iron oxide SCR denitration catalyst and an application method thereof. The catalyst is prepared through the following steps: with a limonite ore as a raw material, crushing and screening to form particles, calcining the particles in an atmosphere of hydrogen or carbon monoxide, so as to reduce goethite in the particles to be magnetite to obtain the catalyst, or further calcining in an air atmosphere, so that the magnetite is oxidized to be maghemite to obtain the catalyst, wherein the goethite content of the limonite ore is not less than 60%, the limonite ore has a nano-micro hierarchical porous structure, and the specific surface area of the limonite ore is not less than 10m<2> / g. When in use, the catalyst and ammonia are simultaneously fed into a flue gas flow at the temperature of 300-450 DEG C, and the catalyst and dust are together adsorbed onto the electrode plate of an electric dust collector or the surface of a filter bag and then are collected into a dust hopper through a dust cleaning method; the SCR denitration catalyst in the material discharged from the dust hopper is separated and recycled through a magnetic separation method; if inactivated, the SCR denitration catalyst can be washed and regenerated with water or weak aqua ammonia.

Description

1. Technical field [0001] The invention relates to the field of air pollution control, in particular to a selective catalytic reduction flue gas denitrification catalyst and an application method thereof. 2. Background technology [0002] Various industrial furnaces such as thermal power plants, sintering plants, cement kilns, and motor vehicles, etc., produce a large amount of NOx during high-temperature combustion. Nitrogen oxide emissions not only cause acid rain, but also lead to regional environmental pollution problems such as photochemical smog and ozone layer depletion. Nowadays, there are two main types of technologies for reducing nitrogen oxides in flue gas: the first type is combustion process control, that is, improving the combustion method and reducing the formation of nitrogen oxides during the combustion process (including low-oxygen combustion technology, multi-stage combustion technology, etc.) The second category is terminal treatment, that is, flue gas ...

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Problems solved by technology

V 2 o 5 / TiO 2 The disadvantages of denitrification catalysts are: first, the cost of catalytic preparation is relatively high; second, the preparation conditions of the catalyst are relatively strict and difficult to control; third, the operating temperature is relatively high at 350-400 ° C, and the control is strict, which is not suitable for the flue gas desulfurization of existing power plants in my country. The actual situation of low temperature after dust removal

The advantage of catalysts prepared with activated carbon as a carrier is that the rich specific surface area of ​​the activated carbon carrier is conducive to the dispersion of active components and has a certain resistance to SO 2 However, during the activation and regeneration process, the high-temperature ablation of activated carbon is too serious, resulting in excessive catalyst loss

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