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Preparation method of low-temperature denitration filter material based on water quenching process

A technology of low-temperature denitrification and water quenching, which is applied in separation methods, chemical instruments and methods, and dispersed particle filtration, etc. It can solve the problem of weak binding force between catalyst and filter bag fiber, poor dispersion of denitrification active components, and reduction of filter cloth fiber strength. and other problems, to achieve the effect of facilitating large-scale industrial production and popularization and application, avoiding spontaneous combustion of filter cloth, and improving stability

Active Publication Date: 2021-03-26
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method has poor dispersibility of denitrification active components, and weak binding force between catalyst and filter bag fiber, which reduces the fiber strength of filter cloth and affects the service life of filter cloth

Method used

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  • Preparation method of low-temperature denitration filter material based on water quenching process
  • Preparation method of low-temperature denitration filter material based on water quenching process

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preparation example Construction

[0025] A method for preparing a denitrification filter material based on a water quenching method in the present invention uses a water quenching method to prepare liquid vanadium pentoxide, and adds organic modifiers and auxiliary agents therein to finally obtain a low-temperature denitrification catalyst precursor emulsion; and then Under negative pressure conditions, the filter cloth is immersed in the emulsion of the precursor of the low-temperature denitration catalyst, and after calcination at 240°C, the low-temperature denitration catalyst is loaded on the polyimide fiber filter cloth to make a low-temperature denitration filter material. The specific steps are as follows:

[0026] (1) Add deionized water into the reaction kettle, heat and melt the vanadium pentoxide powder, pour it into deionized water quickly, and stir it ultrasonically to dissolve.

[0027] (2) Add an organic modifier to the above solution, stir and mix well to obtain a stable vanadium pentoxide emuls...

Embodiment 1

[0046] In this embodiment, the ratio of water to vanadium is 30mL / g, the heating temperature of vanadium pentoxide is 800°C, the temperature of deionized water is 25°C, the content of polyimide emulsion is 3%, and the degree of vacuum is 0.05MPa for specific description. And the low-temperature denitrification filter material obtained under this condition is evaluated on the test bench using simulated flue gas for denitrification performance, that is, the NO and NO in the flue gas at the inlet and outlet of the reactor are tested with a flue gas analyzer. 2 Concentration, calculate NO x The removal efficiency was 82%.

[0047] Under the above parameter conditions, the specific preparation process is as follows,

[0048] (1) Weigh an appropriate amount of vanadium pentoxide powder, put it into a tongs pot, heat it in a muffle furnace to 800° C., and keep it warm for 1 hour to obtain vanadium pentoxide in a molten state.

[0049] (2) Add deionized water into the reactor, the r...

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Abstract

The invention relates to the technical field of purification of industrial boiler flue gas, in particular to a preparation method of a low-temperature denitration filter material based on a water quenching process. The preparation method comprises the following steps: uniformly mixing and stirring vanadium pentoxide powder, an organic modifier and cerous nitrate hexahydrate powder to prepare a low-temperature denitration catalyst precursor emulsion; adding the low-temperature denitration catalyst precursor emulsion into a reaction kettle, and soaking filter cloth in a reaction kettle in vacuum; and finally, drying the soaked filter cloth, and carrying out medium-temperature calcination to obtain the low-temperature denitration filter material. A preparation method of the low-temperature denitration catalyst precursor emulsion comprises the following steps: adding deionized water into the reaction kettle, heating and melting vanadium pentoxide powder, quickly pouring the molten vanadiumpentoxide powder into the deionized water, and conducting ultrasonic stirring and dissolving; adding an organic modifier into the solution, and performing full stirring and uniform mixing to obtain astable vanadium pentoxide emulsion; and finally, adding cerous nitrate hexahydrate powder into the solution, and conducting stirring until the cerous nitrate hexahydrate powder is completely dissolved to obtain the low-temperature denitration catalyst precursor emulsion.

Description

technical field [0001] The invention relates to the technical field of flue gas purification of industrial boilers, in particular to a method for preparing a low-temperature denitrification filter material based on a water quenching method. Background technique [0002] In recent years, my country's industrialization level has increased rapidly, but it has also exacerbated air pollution, PM2.5 exceeding the standard and other environmental problems. Although the corresponding environmental protection policies have been implemented, the atmospheric environment situation is still very severe. Among them, the flue gas produced by the combustion of industrial boilers contains a large amount of nitrogen oxides, sulfur dioxide, and smoke dust. If they are directly discharged into the environment, they will seriously threaten human health. Therefore, how to further reduce the pollutant content in the flue gas of industrial boilers and improve the cleanliness of industrial boilers ...

Claims

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Application Information

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IPC IPC(8): B01D46/02B01D46/00B01D53/86B01D53/56B01J23/22
CPCB01D46/02B01D46/0027B01D53/8628B01J23/002B01J23/22
Inventor 郭中旭杨嵩郑天帅程广文姚明宇蔡铭
Owner XIAN THERMAL POWER RES INST CO LTD
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