Method for regeneration of spent denitration catalyst

A denitrification catalyst and catalyst module technology, which is applied in the field of regeneration of invalid denitrification catalysts, can solve the problems that the active components of the catalyst cannot be selectively replenished, and the rust defects of the metal module frame cannot be effectively removed.

Inactive Publication Date: 2017-06-30
黑龙江丰迪环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention is to solve the technical problem that the catalyst active components lost in the regeneration process of the prior art cannot be selectivel

Method used

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  • Method for regeneration of spent denitration catalyst
  • Method for regeneration of spent denitration catalyst
  • Method for regeneration of spent denitration catalyst

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Experimental program
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Effect test

specific Embodiment approach 1

[0041] Specific implementation mode 1: The method for regeneration of the invalid denitration catalyst in this implementation mode is carried out according to the following steps:

[0042] 1. Ash removal:

[0043] Put the catalyst module at a pressure of 0.1MPa~6.0MPa and a compressed gas flow rate of 0.1m 3 / s~2m 3 Soot blowing for 0.2~1h under the condition of / s, and then sucking ash for 0.3h~2.5h under the pressure of -202KPa~0KPa;

[0044] 2. Spraying:

[0045] Carry out high-pressure water jet cleaning to the catalyst module treated in step 1, the pressure of the high-pressure water jet is 1MPa~10MPa, and then drain;

[0046] 3. Cleaning:

[0047] Immerse the catalyst module treated in step 2 into No. 1 cleaning tank, under the conditions of ultrasonic power of 20Kw, ultrasonic frequency of 28KHz, air source pressure of the bubbling system of 0.2MPa-1.6MPa, and temperature of 20-80°C, Cleaning 0.5h ~ 2h;

[0048] Fourth, re-cleaning:

[0049] Immerse the catalyst ...

specific Embodiment approach 2

[0056] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the dust removal described in step 1 is carried out intermittently, and the interval between each time is 0.1h-1h, and the interval between each time is 0.1h-0.5h. . Others are the same as in the first embodiment.

specific Embodiment approach 3

[0057] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the cleaning medium used for cleaning in step three is composed of deionized water, water-based environmental cleaning agent and activator, wherein the water-based environmental cleaning The agent is sulfuric acid, hexamethylenetetramine, sodium dodecylbenzenesulfonate or citric acid, and the mass concentration of sulfuric acid in the cleaning medium is 0.1% to 1%, and the mass concentration of hexamethylenetetramine is 0.01 to 1%. 0.1%, the mass concentration of sodium dodecylbenzenesulfonate is 0.01-0.05%, the mass concentration of citric acid is 0.01-0.05%, and the activator is one or more of sodium dodecylsulfate and triethanolamine. For the combination of the two, the concentration of sodium lauryl sulfate in the cleaning medium is 10-50 ppm, and the concentration of triethanolamine is 10-50 ppm. Others are the same as those in the first or second embodiment...

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Abstract

The invention discloses a method for regeneration of a spent denitration catalyst, and relates to a composition for a cleaning solution and an application thereof, and an activity recovering method for a spent SCR catalyst. The invention is used for solving the technical problems in the prior art that a lost catalyst active component in a regeneration process cannot be selectively supplemented and an iron rust defect of a metal module framework cannot be effectively eliminated. The method comprises the following steps: one, dust cleaning; two, spraying; three, cleaning; four, re-cleaning; five, acidification; six, pre-drying; and seven, activity supplementing. Cleaning media of sodium hydroxide and potassium hydroxide can dissolve inactivated V2O5 and toxic element arsenic on the surface of the catalyst. While the method can selectively supplement the catalyst active component (TiO2), the iron rust removal rate of the metal module framework reaches 19% to 24%. The invention belongs to the field of spent denitration catalyst regeneration.

Description

technical field [0001] The invention relates to a composition for cleaning liquid, its application and a method for restoring the activity of the spent SCR catalyst. Background technique [0002] my country mainly uses coal as the main energy structure, and its combustion emits a large amount of nitrogen oxides (NOx) into the atmosphere, which is an important precursor of pollution events such as regional smog and acid rain, and is the most important air pollutant in my country. one. In this situation, my country's environmental regulations on NOx emissions have become more stringent since the "Twelfth Five-Year Plan". The "Emission Standards of Air Pollutants for Thermal Power Plants" implemented on January 1, 2012 stipulates that the NOx emission of newly built thermal power units must reach 100mg / Nm 3 . On August 23, 2014, the National Development and Reform Commission, the Ministry of Environmental Protection, and the National Energy Administration jointly issued the "...

Claims

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Application Information

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IPC IPC(8): B01J38/48B01J38/60B01J38/04B01D53/86B01D53/56
CPCB01J38/48B01D53/8625B01J38/04B01J38/485B01J38/60
Inventor 王宝冬孙琦郭芳芳王宇峰
Owner 黑龙江丰迪环保科技有限公司
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