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On-line blockage cleaning method for SCR (selective catalytic reduction) denitration catalyst

A denitrification catalyst and denitrification technology, applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve problems such as increasing the burden on enterprises and cumbersome operations

Active Publication Date: 2016-04-06
YANCHENG LANFENG ENVIRONMENTAL ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is more cumbersome without operation, and additional equipment also increases the burden on the enterprise

Method used

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  • On-line blockage cleaning method for SCR (selective catalytic reduction) denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 An SCR denitrification catalyst online plugging removal equipment

[0033] For the on-line declogging equipment with SCR denitration catalyst described in this embodiment, the structural diagram (longitudinal section) is shown in figure 1 , including a main valve 1, 3 vents 2 with valves (in figure 1 Only two vents are shown in the middle, and the third one is not shown), three compressed air tanks 6 , an SCR denitration reactor 4 with a built-in SCR denitration catalyst 5 , and two pressure detectors 3 . The main valve 1 is arranged at the entrance of the SCR denitrification reactor 4, and is connected with the SCR denitrification reactor 4 through a pipeline; the vent 2 with a valve is arranged between the main valve 1 and the SCR denitration reactor Between the catalysts 5; the vents 2 with valves are each independently configured with a compressed air tank 6, and the compressed air tanks 6 pass through the vents 2 with valves and the SCR denitrification...

Embodiment 2

[0034] Example 2 A method for online declogging of SCR denitrification catalyst

[0035]The SCR denitrification reactor of this embodiment is an out-of-stock reactor of a flue gas purification system in a thermal power plant, and the service life of the catalyst is 3 years. Utilize the equipment described in embodiment 1, carry out SCR denitrification catalyst on-line declogging, for convenience of description, described vent 3 with valve is called No. 1 vent respectively, No. 2 vent (not shown) from bottom to top ) and vent number 3. Including the following operations:

[0036] Close the main valve 1 at the entrance of the SCR reactor 4, open the compressed air tank connected to the No. 1 vent 2 and the valve of the No. 1 vent 2, close the valves of the No. 2 and No. 3 vents, and the compressed air is ventilated through No. 1 Port 2 enters SCR denitration reactor 4. Observe and record the pressure detector 3 reading every 2 minutes. In the process of unclogging, the inl...

Embodiment 3

[0041] Example 3 A method for online declogging of SCR denitrification catalyst

[0042] The SCR denitrification reactor of this embodiment is an out-of-stock reactor of a flue gas purification system in a thermal power plant, and the service life of the catalyst is 4.5 years. The structure of the SCR denitrification catalyst online declogging equipment utilized is the same as that of Embodiment 1. For ease of description, the vents 3 with valves are respectively called No. 1 vents and No. 2 vents (not shown) from bottom to top. ) and vent number 3. Including the following operations:

[0043] Close the main valve 1 at the entrance of the SCR reactor 4, open the compressed air tank 6 connected to the No. 1 vent 2 and the valve of No. 1 vent 2, close the valves of No. 2 and No. 3 vents, and the compressed air passes through No. The vent 2 enters the SCR denitration reactor 4 . Observe and record the pressure detector 3 reading every 2 minutes. In the process of unclogging...

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Abstract

The invention provides an on-line blockage cleaning method for an SCR (selective catalytic reduction) denitration catalyst and equipment applied to the method. According to the method, a gas requiring denitration purification is stopped entering an SCR denitration reactor, and then compressed air is blown to the SCR denitration catalyst from an inlet of the SCR denitration reactor; the air flow pressure at the inlet and an outlet of the SCR denitration reactor is detected in real time, blowing of the compressed air is stopped when the inlet pressure is close to the outlet pressure and the pressure difference is stable, and on-line blockage cleaning is finished. The method is convenient, easy, economical and environment-friendly and has an exact effect, the SCR denitration catalyst is not needed to be dismounted, catalyst blockage cleaning can be finished on line, trouble and labor are saved, and the operation cost of related industry is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of regeneration of an SCR (selective catalytic reduction) denitration catalyst. In particular, it relates to a method for online plug removal of an SCR denitration catalyst. Background technique [0002] Selective Catalytic Reduction (SCR) is currently the most widely used, most mature and effective power plant flue gas, diesel engine exhaust, etc. contain a large amount of NO x Exhaust gas denitrification technology. SCR denitration catalyst is the core of this technology. However, due to the wear and tear caused by fly ash in the flue gas, the deposition of solid substances, and the poisoning of alkali metals and alkaline earth metals, the catalyst activity continues to decline. If no treatment is done, the SCR denitration catalyst will lose its activity after 2-3 years of use and end its life. Due to its high price, the SCR denitrification catalyst accounts for a large investment in the flue gas denit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/04B01J38/12B01D53/86B01D53/56
CPCB01D53/8625B01D2258/01B01D2258/0283B01J38/04B01J38/12
Inventor 姜瑞雨范兰王路明查文伟王加东
Owner YANCHENG LANFENG ENVIRONMENTAL ENG TECH
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