Process for cleaning and regenerating denitration catalyst

A denitration catalyst and process technology, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the reduction of denitration catalyst active components, catalyst wear resistance, and denitration efficiency. problem, to increase the activity and thermal stability, prevent the catalyst from arsenic poisoning, and avoid the effects of multiple roasting

Inactive Publication Date: 2015-04-29
中起重工(大连)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing denitrification catalyst regeneration technology has disadvantages su

Method used

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  • Process for cleaning and regenerating denitration catalyst

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Effect test

Embodiment 1

[0012] For inactivated but still mechanical life and SO 2 / SO 3 For the denitrification catalyst with a conversion rate of 0.61%, take the following steps to regenerate: 1. Preparation of cleaning solution and regeneration solution: (1) Preparation of cleaning solution: prepare 0.1mol / L sulfuric acid solution; Fractions are 0.05% ferrous sulfate; 1% manganese sulfate; 0.08% cerium nitrate; 0.10% lanthanum nitrate; 0.05% S-185. (2) Preparation of regeneration solution: first mix 0.5% vanadyl oxalate and 98.75% deionized water evenly, then add 0.3% ammonium metatungstate and 0.05% ammonium molybdate and stir until completely dissolved , and finally put in 0.4% mass fraction of silica sol ST-O and continue stirring until homogeneous. 2. Regeneration method of denitrification catalyst: After the deactivated but still mechanically durable denitrification catalyst module is purged sequentially, soak in the denitrification catalyst cleaning solution prepared in step (1) for 10 minu...

Embodiment 2

[0014] For inactivated but still mechanical life and SO 2 / SO 3 For the denitrification catalyst with a conversion rate of 0.59%, take the following steps to regenerate: 1. Preparation of cleaning solution and regeneration solution: (1) Preparation of cleaning solution: prepare 0.3mol / L sulfuric acid solution; Fractions are 1% ferrous sulfate; 2% manganese sulfate; 0.10% cerium nitrate; 0.10% lanthanum nitrate; 0.1% S-185. (2) Preparation of regeneration solution: first mix 1% vanadyl oxalate and 97.54% deionized water evenly, then add 1% ammonium metatungstate and 0.06% ammonium molybdate and stir until completely dissolved , and finally put in 0.4% mass fraction of silica sol ST-O and continue stirring until homogeneous. 2. Denitrification catalyst regeneration method: After the deactivated but still mechanically durable denitration catalyst modules are purged sequentially, soak in the denitration catalyst cleaning solution prepared in step (1) for 15 minutes, and then soa...

Embodiment 3

[0016] For inactivated but still mechanical life and SO 2 / SO 3 For the denitrification catalyst with a conversion rate of 0.62%, take the following steps to regenerate: 1. Preparation of cleaning solution and regeneration solution: 1) Preparation of cleaning solution: prepare 0.4mol / L sulfuric acid solution; under the condition of strong stirring, add the mass fraction 5% of manganese sulfate; 0.12% of cerium nitrate; 0.12% of lanthanum nitrate; 0.5% of S-185. (2) Preparation of regeneration solution: First, stir 2% vanadyl oxalate and 95.42% deionized water evenly, then add 2% ammonium metatungstate and 0.08% ammonium molybdate and stir until completely dissolved , and finally put in 0.5% mass fraction of silica sol ST-O and continue stirring until homogeneous. 2. Regeneration method of denitrification catalyst: after the deactivated but still mechanically durable denitrification catalyst module is purged sequentially, soak in the denitrification catalyst cleaning solution...

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Abstract

The invention discloses a process for cleaning and regenerating a denitration catalyst. (1) The cleaning solution comprises the following raw material components: dilute acid, an iron salt, a manganese salt, a cerium salt, a lanthanum salt and an emulsifier S-185; (2) the regenerating solution comprises the following raw material components: vanadyl oxalate, ammonium metatungstate, ammonium molybdate, silica sol ST-O and deionized water; and (3) the cleaning and regenerating process comprises the following steps: uniformly stirring the vanadyl oxalate and deionized water, adding the ammonium metatungstate and ammonium molybdate, fully stirring until the materials are completely dissolved, and finally adding the silica sol ST-O, and further stirring until a homogeneous phase is obtained; sequentially performing strong purging on a deactivated denitration catalyst module, soaking in the cleaning solution for 10-25 minutes, soaking the catalyst in the regenerating solution for 20-40 minutes, taking out the catalyst, and roasting. According to the cleaning solution and regenerating solution of the denitration catalyst and the catalyst regeneration method, the activity of the deactivated denitration catalyst can be efficiently restored, and the temperature range of the catalyst activity is widened.

Description

technical field [0001] The invention relates to a cleaning and regeneration process for a denitration catalyst. Background technique [0002] NO x It is one of the main pollutants that cause air pollution. It can cause acid rain and photochemical smog, and it is also very harmful to human health. my country NO x 70% of the emissions come from the direct combustion of coal, and the power industry and boilers are large coal-fired households. Therefore, thermal power plants and boilers are NO x One of the main emission sources. [0003] Selective catalytic reduction (SCR) is currently the most widely used denitrification technology in the world, and most power plants in Japan, Europe, the United States and other countries and regions basically use this technology. Compared with other technologies, SCR denitrification technology has no by-products, no secondary pollution, simple device structure, mature technology, high denitrification efficiency, reliable operation, and eas...

Claims

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Application Information

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IPC IPC(8): B01J38/00B01J38/60B01J38/52B01J38/04
Inventor 周彤李奇宇刘辰
Owner 中起重工(大连)有限公司
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