Ultrasonic cleaning device and method for deactivated denitration catalyst

A denitration catalyst, ultrasonic cleaning technology, applied in chemical instruments and methods, cleaning methods using liquids, cleaning methods and utensils, etc., to achieve the effect of easy and flexible use, good cleaning effect, and improved cleaning effect

Active Publication Date: 2017-03-22
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technologies do not involve this problem, and the ultrasonic cleaning technology disclosed in the art currently adopts a fixed ultrasonic technology solution in the cleaning process.

Method used

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  • Ultrasonic cleaning device and method for deactivated denitration catalyst
  • Ultrasonic cleaning device and method for deactivated denitration catalyst
  • Ultrasonic cleaning device and method for deactivated denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Ultrasonic cleaning device for deactivating denitrification catalyst.

[0043] Such as figure 1 An ultrasonic cleaning device for deactivating denitration catalysts is shown, including a cleaning tank 1, a first ultrasonic system 2 and a second ultrasonic system 3, the first ultrasonic system 2 is fixed at the bottom of the cleaning tank 1, and the second ultrasonic system 3 passes through Connector 4 is movably connected to the top of cleaning tank 1, and connector 4 is specifically crawler belt; figure 2 As shown, the first ultrasonic system 2 includes 12 ultrasonic vibrating plates 5, respectively T1-T12, arranged symmetrically and orderly in two rows; as image 3 As shown, the second ultrasonic system 3 includes 8 ultrasonic vibrating plates 5, respectively A1-A8, which are arranged symmetrically and orderly in two rows; the frequencies of all ultrasonic vibrating plates 5 can be independently controlled and used separately.

Embodiment 2

[0045] The method for cleaning the deactivated denitration catalyst by using the cleaning device of Example 1.

[0046] The deactivated denitrification catalyst was selected from a coal-fired power plant in China after 24000 hours of V 2 o 5 -WO 3 / TiO 2 Honeycomb denitrification catalyst.

[0047] Include the following steps:

[0048] After removing the ash from the deactivated denitrification catalyst module, check the surface condition of the catalyst after ash removal, and determine the areas with relatively more residual ash accumulation, which are T2, T11 and A2, A8 respectively; put the catalyst in the cleaning tank, add acid cleaning Turn on the ultrasonic vibrating plates T2, T11 and A2, A8 for directional rough cleaning. The frequency of the ultrasonic vibrating plates is 40kHz, the rough washing time is 35min, and the temperature of the cleaning solution is 35°C; after the rough washing is completed, use all the ultrasonic vibrating plates. The switching freque...

Embodiment 3

[0080] The method for cleaning the deactivated denitration catalyst by using the cleaning device of Example 1.

[0081] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 23000 hours of V 2 o 5 -MoO 3 / TiO 2 Flat-plate denitration catalyst. After de-ashing the deactivated denitrification catalyst module, check the surface condition of the catalyst after de-ashing, and determine the areas with relatively more residual ash accumulation, which are T3, T9 and A2, A6 respectively. Put the catalyst in the cleaning tank, add alkaline For cleaning solution, turn on the ultrasonic vibrating plates T3, T9, A2, and A6 for directional coarse cleaning. The frequency of the ultrasonic vibrating plates is 30kHz, the rough cleaning time is 25min, and the temperature of the cleaning liquid is 50°C; after the rough cleaning is completed, put all the ultrasonic vibrating plates into use , switch the frequency of the ultrasonic vibrating plate to...

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Abstract

The invention discloses an ultrasonic cleaning device for a deactivated denitration catalyst. The device includes a cleaning tank, a first ultrasound system and a second ultrasound system, wherein both the first ultrasound system and the second ultrasound system comprise a plurality of ultrasonic vibration plates; the first ultrasound system is fixed at the bottom of the cleaning tank, and the second ultrasound system is movably connected to the upper portion of the cleaning tank. The invention further provides a method for cleaning the deactivated denitration catalyst by using the device. The method includes the three steps of pretreatment, directional low-frequency roughly cleaning and high frequency fine cleaning. The method adopts different ultrasonic cleaning schemes based on different forms of denitration catalysts. The energy consumption of cleaning is low, dust and toxic substances accumulated in pore passages and on the surface of the denitration catalyst can be effectively removed, at the same time, negative impacts of ultrasonic cleaning on physical properties of the catalyst are reduced, and after the catalyst is cleaned, the loss amount of catalyst active component V2O5 is little.

Description

technical field [0001] The invention relates to the technical field of regeneration of selective catalytic reduction catalysts, in particular to a cleaning device and method for deactivated denitration catalysts. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. In my country, coal-fired power plants are NO x important sources of emissions. In recent years, with the popularization and application of selective catalytic reduction (SCR) technology, the NO x The effect of emission reduction is obvious. However, it also brings a series of problems. As the core of SCR denitrification technology, the denitrification catalyst can be divided into three types according to the form: honeycomb type, plate type and corrugated plate type. Generally, it will be deactivated after 24000 hours of operation. x emission indicators, the deactivated catalyst needs to be replaced. If it is directly landfilled, it will not only cause a gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/48B01J38/60B01J38/64B01D53/96B08B3/12
Inventor 王虎李倩黄力纵宇浩陈志平王晓伟
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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