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SCR denitration catalyst regeneration cleaning agent and regeneration method of regeneration cleaning agent

A technology of denitrification catalyst and cleaning agent, which is applied in the direction of chemical instruments and methods, detergent compounding agents, detergent compositions, etc., can solve problems such as environmental pollution, poor biodegradability, and personal poisoning injuries, and reduce the difficulty of processing and loss The effect of low rate and reduced churn

Inactive Publication Date: 2017-01-25
HUANENG POWER INTERNATIONAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Both Chinese patent applications 201210512916.6 and 201410456853.6 use corrosive fluorine-containing environmentally harmful compounds as cleaning agent formulas, which are prone to personal poisoning and injury during regeneration operations; , which is an environmental hormone with poor biodegradability, which will bring new environmental pollution problems

Method used

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  • SCR denitration catalyst regeneration cleaning agent and regeneration method of regeneration cleaning agent
  • SCR denitration catalyst regeneration cleaning agent and regeneration method of regeneration cleaning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Preparation of cleaning agent

[0023] In the cleaning tank, with deionized water as solvent, the mass fraction of sodium dodecylsulfonate is 15%, the mass fraction of PBTCA is 1%, the mass fraction of DTPMPA is 1%, and the mass fraction of hydrolyzed polymaleic anhydride is 5%. , perform mechanical stirring for 10 minutes to make it evenly mixed, and then place it for aging for 30 minutes.

[0024] 2. Clean the invalid denitrification catalyst

[0025] The cross-section of the spent catalyst during cleaning is 150mm×150mm, the number of holes is 20×20, and the length is 670mm.

[0026] 1) The denitration catalyst to be regenerated is purged and deashed by gas, and the floating ash attached to the surface is removed;

[0027] 2) Soak the denitrification catalyst that is purged and deashed by gas in a cleaning pool filled with the cleaning agent, and the soaking time is 30 minutes;

[0028] 3) After soaking, use bubbling / ultrasonic disturbance cleaning to remove th...

Embodiment 2

[0032] 1. Preparation of cleaning agent

[0033] In the cleaning tank, with deionized water as a solvent, the mass fraction of sodium dodecylsulfonate is 12%, the mass fraction of PBTCA is 5%, the mass fraction of DTPMPA is 1%, and the mass fraction of hydrolyzed polymaleic anhydride is 1%. , perform mechanical stirring for 10 minutes to make it evenly mixed, and then place it for aging for 30 minutes.

[0034] 2. Clean the invalid denitrification catalyst

[0035] The cross-section of the spent catalyst during cleaning is 150mm×150mm, the number of holes is 20×20, and the length is 670mm.

[0036] 1) The denitration catalyst to be regenerated is purged and deashed by gas, and the floating ash attached to the surface is removed;

[0037] 2) Soak the denitrification catalyst with gas purging and deashing in the cleaning pool filled with the cleaning agent, and the soaking time is 60 minutes;

[0038] 3) After soaking, use bubbling / ultrasonic disturbance cleaning to remove th...

Embodiment 3

[0042] 1. Preparation of cleaning agent

[0043] In the cleaning tank, with deionized water as a solvent, the mass fraction of sodium dodecylsulfonate is 12%, the mass fraction of PBTCA is 1%, the mass fraction of DTPMPA is 5%, and the mass fraction of hydrolyzed polymaleic anhydride is 1%. , perform mechanical stirring for 10 minutes to make it evenly mixed, and then place it for aging for 30 minutes.

[0044] 2. Clean the invalid denitrification catalyst

[0045] The cross-section of the spent catalyst during cleaning is 150mm×150mm, the number of holes is 20×20, and the length is 670mm.

[0046] 1) The denitration catalyst to be regenerated is purged and deashed by gas, and the floating ash attached to the surface is removed;

[0047] 2) Soak the denitrification catalyst with gas purging and deashing in the cleaning tank equipped with the cleaning agent, and the soaking time is 45 minutes;

[0048] 3) After soaking, use bubbling / ultrasonic disturbance cleaning to remove ...

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Abstract

The invention discloses an SCR denitration catalyst regeneration cleaning agent and a regeneration method of the regeneration cleaning agent. The SCR denitration catalyst regeneration cleaning agent comprises the following components in mass fraction: 5%-15% of sodium dodecyl sulfate, 1%-5% of 2-phosphate-1,2,4-tricarboxylic acid butane PBTCA, 1%-5% of diethylene triamine penta(methylene phosphonic acid) DTPMPA, 1%-5% of hydrolytic polymaleic anhydride and the balance of a deionized water solvent. The regeneration method comprises the following steps: (1) carrying out gas purging dusting on a to-be-regenerated denitration catalyst, so as to remove floating dust attached to the surface of the denitration catalyst; (2) soaking the processed denitration catalyst into a cleaning tank filled with the cleaning agent; (3) after the soaking, removing blocked dust dirt in a denitration catalyst pore in a bubbling / ultrasonic disturbing cleaning manner; (4) bleaching the cleaned denitration catalyst by virtue of pressurized clean water; and (5) drying the bleached denitration catalyst, so as to obtain the regenerated denitration catalyst.

Description

technical field [0001] The invention belongs to the field of selective catalytic reduction denitrification purification of flue gas in thermal power plants, and in particular relates to a cleaning agent for regenerating an SCR denitration catalyst and a cleaning method. Background technique [0002] The amount of nitrogen oxides emitted by thermal power plants into the atmosphere accounts for 30% to 40% of the national total. With the promulgation of the latest "Environmental Standards for Air Pollutants in Thermal Power Plants GB13223-2011", NOx emissions are gradually being strictly controlled. The most effective flue gas denitrification technology has been more and more widely used in flue gas denitrification in thermal power plants. The catalyst is the core of the SCR denitrification process, and its cost accounts for about 30% of the initial construction cost of the overall denitrification system. However, the catalyst gradually ages and fails as the flue gas scours vio...

Claims

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Application Information

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IPC IPC(8): C11D1/14C11D3/60C11D3/36C11D3/37
CPCC11D1/14C11D3/364C11D3/365C11D3/3765
Inventor 王凯张强李建玺吴国勋郭利静尹琢然罗奖合
Owner HUANENG POWER INTERNATIONAL