Method for preparing selective catalytic reduction and denitration catalyst by boiler coal ash

A denitration catalyst and fly ash technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as high cost, hindering large-scale application and promotion, and reducing catalyst denitration activity.

Active Publication Date: 2005-04-20
TSINGHUA UNIV +1
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Problems solved by technology

These sulfate deposits will accumulate on the surface of the catalyst, resulting in a reduction in the denitrification activity of the catalyst.
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Method used

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  • Method for preparing selective catalytic reduction and denitration catalyst by boiler coal ash

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Embodiment Construction

[0031] Referring to Fig. 1, the steps of the inventive method are as follows:

[0032] ① Fly ash forming: The fly ash in the tail dust removal device of the pulverized coal combustion boiler, the lime and gypsum powder in the additive, the ordinary portland cement and the aluminum oxide powder particles are respectively 80% to 82% according to the mass ratio. 15% to 16%, 3% to 4% and 0.04% to 1% are mixed for the purpose of effectively increasing the specific surface area of ​​fly ash and increasing the number of fly ash micropores. After the stirred mixture is left to stand for 30-60 minutes, it is sent into a pretreatment tank, and the mixture is molded for more than 8 hours by using high-temperature and high-pressure steam with a temperature of 850-950°C and a pressure of 80-100 standard atmospheres. Activate pretreatment. The molded fly ash solid blocks are mechanically crushed and screened to obtain molded fly ash particles with a particle size ranging from 0.3 to 1 mm. ...

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Abstract

A process for preparing selective catalytic reduction denitration catalyst containes following steps, 1, fly ash and additive are mixed and stirred, active shaping pretreated in reactor, shaped fly ash grain is obtained by pulverizing and sieving fly ash block. 2, soaking shaped fly ash grain by high-concentration strong acid, flushing it to neutrality by distilled water, to form modified SCR denitration catalyst carrier through drying once more. 3, soaking modified SCR denitration catalyst carrier into metal oxide salt solution to obtain the selective catalytic reduction denitration catalyst through two time drying and calcinating.

Description

technical field [0001] The invention relates to the technical field of environmental protection for flue gas purification, in particular to a method for preparing a selective catalytic reduction denitrification catalyst by using boiler fly ash. Background technique [0002] With the acceleration of industrialization, human activities are emitting more and more nitrogen oxides (NOx) into the atmosphere. NOx can cause a series of problems such as acid rain and photochemical smog, which destroy the earth's ecological environment and damage human health. Therefore, how to effectively remove NOx has become a very concerned issue in the field of environmental protection. [0003] At present, people adopt measures to reduce NOx emissions, which are mainly divided into two types: combustion control and post-combustion control. Among them, the flue gas selective catalytic reduction (SCR) method in post-combustion control is widely used due to its low cost and high efficiency. In o...

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Application Information

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IPC IPC(8): B01D53/56B01D53/86
Inventor 宣小平姚强赵旭东曹慧芳
Owner TSINGHUA UNIV
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