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Preparation method and application of modified SCR catalyst

A SCR catalyst and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, catalyst regeneration/reactivation, etc., to achieve the effect of saving floor space and avoiding catalytic effects

Inactive Publication Date: 2019-09-20
湖北中和普汇环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Various other methods are currently in the research stage, and each has a certain scope of application and advantages and disadvantages

Method used

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  • Preparation method and application of modified SCR catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Waste Ti-based V after deactivation in a coal-fired power plant 2 o 5 -WO 3 The SCR denitrification catalyst is modified and prepared, and the surface of the spent SCR catalyst is cleaned by ultrasonic combined with pulse blowing.

[0032] The specific operation is to conduct a pulse blowing of the waste SCR catalyst under the condition of ultrasonic frequency of 100KHZ ~ 130KHZ for 3-5 minutes, and then perform a pulse blowing. The air pressure of the pulse blowing is 0.7-1MPa, and the flow rate is 0.9-1.2m 3 / s, the pulse action interval is 0.2-0.5 seconds, and the cycle is 2-3min; in this way, the ultrasonic and pulse complete a cleaning cycle, and the whole cleaning process lasts for 5-7 cycles.

[0033] Then, the waste SCR catalyst after cleaning is crushed into powders with a size of 150-200 meshes, and after the powders are cleaned and dried with deionized water, 20 g of waste SCR catalyst powders are placed in 100 ml of deionized water, and Fe 2+ : Fe 3+ :1...

Embodiment 2

[0036] Get 20g of spent SCR catalyst powder identical to the pretreatment method described in Example 1, place in 100ml of deionized water, add Fe 2+ : Fe 3+ :2:3 FeCl 2 and FeCl 3 , so that the total iron ion concentration is 0.6mol / L, add ammonia water to adjust the pH of the solution to about 8.5, stir fully while adding ammonia water, then put the SCR catalyst powder in the solution for 1 hour, filter out the SCR catalyst powder, and then transfer Dry in a drying oven for 12 hours, and finally put the catalyst powder into a KSL series box-type high-temperature sintering furnace, and calcinate at 400°C for 2 hours to obtain a magnetically modified catalyst powder. Its operating process is similar to that described in Example 1.

[0037] In summary, the present invention sprays magnetically modified spent SCR catalyst powder into the SCR front flue, and Hg is mixed with the flue gas in the flue. 0 and NO oxidation, the Hg 0 Converted to soluble Hg that can be captured b...

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Abstract

The invention discloses a preparation method and application of a modified SCR catalyst. The method comprises the following steps: cleaning the surface of waste SCR catalyst, and crushing and grinding the waste SCR catalyst; supporting and drying an iron oxide; and by supporting the iron oxide on the surface of the catalyst powder, producing a magnetic modified SCR powder catalyst. The waste SCR catalyst is sprayed into the front end of an SCR device for Hg0 oxidation after being retreated; meanwhile, the oxidation capacity on NO is improved, the treatment efficiency of a subsequent SCR unit is obviously improved, the service life of subsequent SCR equipment is prolonged, and meanwhile, the adverse effect of the ammonia injection process of the SCR unit on oxidation of Hg0 is avoided. Due to the existence of the powdery catalyst active component and chlorine, the removal efficiency of Hg0 is greatly improved, the catalyst has magnetism, and the powdery catalyst can be magnetically recycled after being sprayed into a flue for synchronous denitration and demercuration.

Description

technical field [0001] The invention relates to the technical field of regeneration of out-of-stock catalysts, in particular to a preparation method and application of a modified SCR catalyst. Background technique [0002] At present, Selective Catalytic Reduction (SCR) denitrification technology has been widely used in coal-fired power plant flue gas denitrification system, and the SCR denitrification catalyst is the core part of the process. As the flue gas control standards of coal-fired power plants become more and more stringent, the efficiency requirements and replacement frequency of flue gas denitrification catalysts by domestic manufacturers will also increase. However, on the one hand, precious metals such as vanadium, tungsten, and titanium in SCR flue gas denitration catalyst components are expensive, and on the other hand, catalysts are consumables. With the stricter emission standards of nitrogen oxides in domestic thermal power plants, the waste catalysts prod...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/888B01J23/92B01J37/34B01J37/02B01J37/08B01J38/02B01J38/48B01J38/00B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/30B01J23/888B01J23/92B01J37/0201B01J37/082B01J37/343B01J38/00B01J38/02B01J38/48B01J38/485
Inventor 胡将军王凤娟刘青松官建敏
Owner 湖北中和普汇环保科技有限公司
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