Method for reducing SO2 oxidation rate increase of denitrification catalyst

A denitrification catalyst, SO2 technology, applied in the direction of catalyst activation/preparation, catalyst regeneration/reactivation, chemical instruments and methods, etc., can solve the problems of catalyst performance degradation and achieve the effect of reducing industrial waste

Active Publication Date: 2016-05-04
MITSUBISHI HEAVY IND LTD
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Problems solved by technology

[0003] In the exhaust gas of coal-fired boilers, the calcium component contained in the dust in the exhaust gas is mainly attached to the surface of the catalyst to generate anhydrous calcium sulfate contained in the exhaust gas, which covers the surface of the catalyst and hinders NO and NH 3 The gas diffuses into the catalyst, reducing the performance of the catalyst

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  • Method for reducing SO2 oxidation rate increase of denitrification catalyst

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Embodiment 1

[0026] The catalyst of the present invention is a denitrification catalyst used to remove nitrogen oxides in combustion exhaust gas. 2 When the silica component (silicon compound), which is the inhibitory substance of the increase in the oxidation rate, accumulates on the surface of the catalyst, the silica component already accumulated on the catalyst surface is dissolved to regenerate the catalyst.

[0027] Here, the denitration catalyst regenerated by the present invention has titanium oxide as the main component and contains vanadium, tungsten, molybdenum, etc. as active components, specifically, binary system TiO 2 -WO 3 Catalyst, TiO 2 -MoO 3 Catalyst; or ternary TiO 2 -V 2 o 5 -WO 3 Catalyst, TiO 2 -V 2 o 5 -MoO 3 Catalyst etc.

[0028] Moreover, if the regeneration treatment method of the present invention is shown in the order of steps, the regeneration treatment method of the present invention is a treatment method that undergoes an activation treatment st...

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Abstract

The present invention provides a catalyst, which is used to remove the denitration catalyst of nitrogen oxides in the burning exhaust gas. It is the main factors that become the main factors of the increased oxidation rate of SO2In the case, the silicon ingredients that have accumulated on the surface of the catalyst will be dissolved to regenerate the catalyst.This can remove obstacles such as silicon dioxide ingredients covering the surface of the denitration catalyst, so that the oxidation rate of the regenerative denitration catalyst will not increase.

Description

technical field [0001] The invention relates to reducing the SO of the denitrification catalyst 2 way of increasing the oxidation rate. Background technique [0002] In recent years, from the viewpoint of preventing air pollution, nitrogen oxides (hereinafter referred to as NO) produced from boilers and various combustion furnaces have been x ) method, widely used is the ammonia catalytic reduction mode that ammonia is used as a reducing agent and is decomposed into nitrogen and water by catalyst catalysis. For NO in actual application x Except for the catalyst, in order to prevent clogging due to dust in the exhaust gas and to expand the gas contact area, a honeycomb catalyst having a square pore shape is the mainstream. In addition, in terms of catalyst components, catalysts containing titanium oxide as the main component are excellent, and catalysts containing vanadium, tungsten, etc. as active components are generally used, and binary TiO is mainly used. 2 -WO 3 Cat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/64B01D53/94B01D53/96B01J23/30B01J23/92B01J38/60
CPCB01J38/64B01D53/96B01D2255/20707B01D2255/20723B01D2255/20769B01D2255/20776B01J37/06B01J38/60B01J23/30B01J37/0036B01J37/0215B01J21/063B01D53/8625B01J21/08B01J21/20
Inventor 野地胜己清泽正志
Owner MITSUBISHI HEAVY IND LTD
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