阅读说明：本技术 一种免烧式除尘脱硝陶瓷滤管的再生方法 (Regeneration method of baking-free dedusting denitration ceramic filter tube ) 是由 潘有春 陈志� 王光应 于 2021-10-08 设计创作，主要内容包括：本发明公开一种免烧式除尘脱硝陶瓷滤管的再生方法,涉及工业烟气净化技术领域,包括以下步骤：(1)对免烧式除尘脱硝陶瓷滤管进行清灰；(2)配制清洗剂和活性再生液；(3)将步骤(2)中的清洗剂超声振荡雾化形成雾化气,将雾化汽通过陶瓷滤管,对陶瓷滤管进行预处理；(4)将经过预处理的陶瓷滤管放入水中清洗,然后烘干,放入活性再生液中,再生后进行干燥焙烧。本发明的有益效果在于：本发明将清洗剂并进行超声振荡雾化形成雾化气,对陶瓷滤管进行预清洗,无需采用液态酸洗、碱洗,在恢复再生免烧式陶瓷滤管催化性能的同时保持了其机械强度,可以广泛适用于免烧式陶瓷滤管的再生。(The invention discloses a regeneration method of a baking-free dedusting denitration ceramic filter tube, which relates to the technical field of industrial flue gas purification and comprises the following steps: (1) ash removal is carried out on the baking-free type dust removal denitration ceramic filter tube; (2) preparing a cleaning agent and an active regeneration liquid; (3) ultrasonically oscillating and atomizing the cleaning agent in the step (2) to form atomized gas, and passing the atomized gas through a ceramic filter tube to pretreat the ceramic filter tube; (4) and (3) putting the pretreated ceramic filter tube into water for cleaning, then drying, putting into an active regeneration liquid, and drying and roasting after regeneration. The invention has the beneficial effects that: the cleaning agent is subjected to ultrasonic oscillation and atomization to form atomized gas, the ceramic filter tube is pre-cleaned without liquid acid washing and alkali washing, the catalytic performance of the regeneration burn-free ceramic filter tube is recovered, the mechanical strength of the regeneration burn-free ceramic filter tube is maintained, and the regeneration process can be widely applied to regeneration of the burn-free ceramic filter tube.)

1. A regeneration method of a baking-free dedusting denitration ceramic filter tube is characterized by comprising the following steps: the method comprises the following steps:

(1) ash removal is carried out on the baking-free type dust removal denitration ceramic filter tube;

(2) preparing a cleaning agent and an active regeneration liquid;

(3) ultrasonically oscillating and atomizing the cleaning agent in the step (2) to form atomized gas, and passing the atomized gas through a ceramic filter tube to pretreat the ceramic filter tube;

(4) and (3) putting the pretreated ceramic filter tube into water for cleaning, then drying, putting into an active regeneration liquid, and drying and roasting after regeneration.

2. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: and (2) performing ash removal by adopting high-pressure blowing in the step (1).

3. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: the cleaning agent comprises inorganic acid with the concentration of 180-200g/L and the concentration of 40-50g/LH₂O₂HF with the concentration of 35-50g/L, polyaspartic acid with the concentration of 20-30g/L, polyphenolic acid with the concentration of 10-15g/L, and water is used as a solvent.

4. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 3, characterized in that: heating the cleaning agent to 95 ℃, and then carrying out ultrasonic oscillation atomization, wherein the mass ratio of the consumption of the cleaning agent to the ceramic filter tube is 5-10: 1.

5. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: the regeneration liquid in the step (3) comprises titanyl sulfate with the concentration of 50g/L, citric acid with the concentration of 20-50g/L, ammonium heptamolybdate with the concentration of 15g/L and ammonium metavanadate with the concentration of 5g/L, and the solvent is water.

6. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 5, characterized in that: and (4) soaking the active regeneration liquid in the step (4) for 5-10 min.

7. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: and (4) putting the pretreated ceramic filter tube into water for ultrasonic oscillation cleaning, wherein the cleaning time is 10-20 min.

8. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: the drying temperature in the step (4) is 120 ℃.

9. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: the drying temperature in the step (4) is 60 ℃.

10. The regeneration method of the baking-free dedusting denitration ceramic filter tube as claimed in claim 1, characterized in that: in the step (4), the roasting temperature is 400 ℃, and the roasting time is 3 hours.

Technical Field

The invention relates to the technical field of industrial flue gas purification, in particular to a regeneration method of a baking-free type dust removal denitration ceramic filter tube.

Background

Dust and Nitrogen Oxides (NO)_x) Is burningAtmospheric pollutants generated in the combustion of materials. Dust and Nitrogen Oxide (NO) can be realized by adopting catalytic ceramic filter tube_x) And simultaneously removing. The ceramic substrate of the existing catalytic ceramic filter tube can be divided into a high-temperature sintering type and a baking-free type. For example, the ceramic filter tube prepared in the patent publication No. CN107915475B is of a high-temperature sintering type, while the ceramic filter tube prepared in the patent publication No. CN 108434870A is of a baking-free type.

At present, the dust removal function of the ceramic filter tube can reach 5-8 years generally, and the catalytic function of the ceramic filter tube can be gradually attenuated due to the fact that catalytic components in the ceramic filter tube are easily affected by high temperature and dust components, the service life of the ceramic filter tube is about 3 years generally, and therefore a certain service life mismatch phenomenon exists between the dust removal function and the catalytic function of the ceramic filter tube. Meanwhile, the inactivated catalytic ceramic filter tube belongs to solid hazardous waste, occupies a large area, and is easy to cause environmental pollution when being discarded at will. The regeneration of the catalytic activity of the ceramic filter tube can solve the problem that the dust removal function and the catalytic function of the ceramic filter tube are not matched in service life to a certain extent, and the replacement cost of the ceramic filter tube applicable to enterprises can be remarkably saved. Patent application publication No. CN112090453A discloses a method for regenerating a ceramic filter tube, but it is widely applied to acid leaching and alkali leaching, and the wet treatment process of acid leaching and alkali leaching for a long time will significantly weaken the mechanical strength of a non-fired ceramic filter tube that is bonded with a binder without firing.

Disclosure of Invention

The technical problem to be solved by the invention is that the regeneration method of the ceramic filter tube in the prior art can obviously weaken the mechanical strength of the baking-free ceramic filter tube, and provides a regeneration method capable of maintaining the catalytic performance and the mechanical strength of the baking-free ceramic filter tube.

The invention solves the technical problems through the following technical means:

a regeneration method of a baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) ash removal is carried out on the baking-free type dust removal denitration ceramic filter tube;

(2) preparing a cleaning agent and an active regeneration liquid;

(3) ultrasonically oscillating and atomizing the cleaning agent in the step (2) to form atomized gas, and passing the atomized gas through a ceramic filter tube to pretreat the ceramic filter tube;

(4) and (3) putting the pretreated ceramic filter tube into water for cleaning, then drying, putting into an active regeneration liquid, and drying and roasting after regeneration.

Has the advantages that: the cleaning agent is subjected to ultrasonic oscillation and atomization to form atomized gas, the ceramic filter tube is pre-cleaned without liquid acid washing and alkali washing, the catalytic performance of the regeneration burn-free ceramic filter tube is recovered, the mechanical strength of the regeneration burn-free ceramic filter tube is maintained, and the regeneration process can be widely applied to regeneration of the burn-free ceramic filter tube.

Preferably, the cleaning agent comprises inorganic acid with the concentration of 180-200g/L and the concentration of 40-50g/LH₂O₂HF with the concentration of 35-50g/L, polyaspartic acid with the concentration of 20-30g/L, polyphenolic acid with the concentration of 10-15g/L, and water is used as a solvent.

Has the advantages that: according to the invention, through screening of the cleaning agent, when the concentration of each component of the cleaning agent or the component is not under the recorded conditions, the catalytic performance of the regenerated ceramic filter tube is obviously reduced.

Preferably, the step (1) adopts high-pressure blowing to perform ash removal. Removing the dust adhered to the windward side.

Preferably, in the step (2), the cleaning agent is heated to 95 ℃ and then subjected to ultrasonic oscillation atomization, and the mass ratio of the consumption of the cleaning agent to the mass ratio of the cleaning agent to the cleaning agent.

Has the advantages that: the negative pressure exists in the inner cavity of the ceramic filter tube, so that the atomized steam of the cleaning agent passes through the ceramic filter tube at a constant speed, and the atomized steam reacts with alkali metal and alkaline earth metal which reduce the catalytic efficiency in the ceramic filter tube in the process of passing through the ceramic filter tube, so that catalytic poisoning substances are converted into soluble salts.

Preferably, the regeneration liquid in the step (3) comprises titanyl sulfate with the concentration of 50g/L, citric acid with the concentration of 35-50g/L, ammonium heptamolybdate with the concentration of 15g/L and ammonium metavanadate with the concentration of 5g/L, and the solvent is water.

Has the advantages that: the invention screens the composition and proportion of the regeneration liquid, so that the denitration efficiency of the regenerated ceramic filter tube can be improved.

Preferably, in the step (4), the pretreated ceramic filter tube is placed in water for ultrasonic oscillation cleaning, and the cleaning time is 10-20 min.

Has the advantages that: and (4) negative pressure exists in the inner cavity of the ceramic filter tube, and external solution quickly permeates into the inner cavity of the ceramic filter tube through the pore channel by ultrasonic oscillation cleaning, so that toxic substances dissolved out in the step (3) are brought out.

Preferably, the drying temperature in the step (4) is 120 ℃.

Preferably, the dipping time of the active regeneration liquid in the step (4) is 5-10 min.

Has the advantages that: the ceramic filter tube is dried at high temperature to quickly lose water, and negative pressure still exists in the inner cavity of the ceramic filter tube when the regenerated liquid is soaked, so that the water contact time of the ceramic filter tube matrix is shortened.

Preferably, the drying temperature in the step (4) is 60 ℃.

Preferably, the roasting temperature in the step (4) is 400 ℃, and the roasting time is 3 h.

The invention has the advantages that: the cleaning agent is adopted and subjected to ultrasonic oscillation and atomization to form atomized gas by screening the composition and the proportion of the cleaning agent, the ceramic filter tube is pre-cleaned without adopting liquid acid washing and alkali washing, the mechanical strength of the regenerated baking-free ceramic filter tube is maintained while the catalytic performance of the regenerated baking-free ceramic filter tube is recovered, and the regeneration method can be widely applied to regeneration of the baking-free ceramic filter tube.

When the concentrations of the components of the cleaning agent or the components are not under the above-mentioned conditions, the catalytic performance of the regenerated ceramic filter tube is significantly reduced.

The invention screens the composition and proportion of the regeneration liquid, so that the denitration efficiency of the regenerated ceramic filter tube can be improved.

And (4) negative pressure exists in the inner cavity of the ceramic filter tube, and external solution quickly permeates into the inner cavity of the ceramic filter tube through the pore channel by ultrasonic oscillation cleaning, so that toxic substances dissolved out in the step (3) are brought out.

The ceramic filter tube is dried at high temperature to quickly lose water, and negative pressure still exists in the inner cavity of the ceramic filter tube when the regenerated liquid is soaked, so that the water contact time of the ceramic filter tube matrix is shortened.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.

Example 1

The regeneration method of the baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises nitric acid with concentration of 200g/L and 50g/LH₂O₂HF with the concentration of 50g/L, polyaspartic acid with the concentration of 30g/L and polyphenolic acid with the concentration of 15g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: the regeneration liquid comprises titanyl sulfate with the concentration of 50g/L, citric acid with the concentration of 50g/L, ammonium metavanadate with the concentration of 5g/L and ammonium heptamolybdate with the concentration of 15g/L, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 5min for activity regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Example 2

The regeneration method of the baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises nitric acid with a concentration of 180g/L and 40g/LH₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: the regeneration liquid comprises 50g/L titanyl sulfate, 35g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Example 3

The regeneration method of the baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 200g/L hydrochloric acid and 50g/LH₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: the regeneration liquid comprises 50g/L titanyl sulfate, 35g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Example 4

The regeneration method of the baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/LH₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: the regeneration liquid comprises 50g/L titanyl sulfate, 40g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Example 5

The regeneration method of the baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/L H₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: the regeneration liquid comprises 50g/L titanyl sulfate, 40g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 15 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Example 6

The regeneration method of the baking-free dedusting denitration ceramic filter tube comprises the following steps:

(1) carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/L H₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: the regeneration liquid comprises 50g/L titanyl sulfate, 35g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating the cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 5: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Comparative example 1

(1) Carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/LH₂O₂Polyaspartic acid with the concentration of 20g/L, polyphenolic acid with the concentration of 10g/L and water as a solvent;

(3) preparing ceramic filter tube active regeneration liquid: comprises 50g/L titanyl sulfate, 40g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Comparative example 2

(1) Carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises hydrochloric acid with the concentration of 180g/L, HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, and the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: comprises 50g/L titanyl sulfate, 40g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Comparative example 3

(1) Carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/LH₂O₂HF with the concentration of 35g/L, and the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: comprises 50g/L titanyl sulfate, 40g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Comparative example 4

(1) Carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/LH₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: comprises 50g/L titanyl sulfate, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) heating a cleaning agent for the ceramic filter tube to 95 ℃, and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and preprocessing the filter tube, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 10: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 20 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Comparative example 5

(1) Carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a ceramic filter tube cleaning agent: the cleaning agent comprises 180g/L hydrochloric acid and 40g/LH₂O₂HF with the concentration of 35g/L, polyaspartic acid with the concentration of 20g/L and polyphenolic acid with the concentration of 10g/L, wherein the solvent is water;

(3) preparing ceramic filter tube active regeneration liquid: comprises 50g/L titanyl sulfate, 40g/L citric acid, 5g/L ammonium metavanadate and 15g/L ammonium heptamolybdate, and the solvent is water;

(4) immersing the ceramic filter tube into a ceramic cleaning agent for ultrasonic cleaning for 5min, wherein the mass ratio of the cleaning agent to the ceramic tube is 10: 1;

(5) drying the ceramic filter tube cleaned in the step (4) at 120 ℃, putting the ceramic filter tube into the regeneration liquid in the step (3), and soaking for 10min for active regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Comparative example 6

(1) Carrying out high-pressure blowing ash removal treatment on the ceramic tube to remove the dust adhered to the windward side;

(2) preparing a cleaning agent for the ceramic filter tube, wherein the cleaning agent comprises nitric acid with the concentration of 100g/L and 30g/LH₂O₂HF with the concentration of 20g/L, polyaspartic acid with the concentration of 10g/L and polyphenolic acid with the concentration of 5g/L, wherein the solvent is water;

(3) preparing an active regeneration liquid for the ceramic filter tube, wherein the regeneration liquid comprises 50g/L of titanyl sulfate, 20g/L of citric acid, 5g/L of ammonium metavanadate and 15g/L of ammonium heptamolybdate, and the solvent is water;

(4) heating the ceramic cleaning agent to 95 ℃ and then carrying out ultrasonic oscillation atomization, so that the formed cleaning agent atomized steam passes through the ceramic filter tube, and the filter tube is pretreated, wherein the mass ratio of the consumed cleaning agent to the ceramic tube is 5: 1;

(5) placing the pretreated ceramic filter tube into clear water, and ultrasonically oscillating and cleaning for 10 min;

(6) drying the ceramic filter tube cleaned in the step (5) at 120 ℃, and then putting the ceramic filter tube into the regeneration liquid in the step (3) for soaking for 5min for activity regeneration;

(7) drying the ceramic filter tube regenerated by the active liquid at 60 ℃, and roasting at 400 ℃ for 3h to finish the regeneration process of the ceramic filter tube; and obtaining the regenerated ceramic filter tube.

Experimental data and analysis:

the denitration performance and the rupture strength of the regenerated ceramic filter tube are subjected to performance test, and the denitration performance test conditions are as follows: the simulated gas composition was: NO (1000ppm), NH₃(1000ppm)、O₂(6vol.％)、N₂As carrier gas, the filtering air speed of the ceramic filter tube is 0.5 m/min. The performance results are shown in Table 1.

The flexural strength was measured using the standard GB/T3001 and the results are shown in Table 2.

Table 1 shows the properties of the regenerated ceramic filter tubes in the comparative examples

Table 2 shows the flexural strength of the ceramic filter tubes of example 5, comparative example 5 and before regeneration

It can be seen from tables 1 and 2 that the cleaning agent and the regeneration liquid of the present invention can improve the catalytic performance of the regeneration burn-free ceramic filter tube, and the ultrasonic oscillation atomization method of the present invention is adopted to pretreat the ceramic filter tube, so that the catalytic performance of the regeneration burn-free ceramic filter tube can be improved, and the mechanical strength of the regeneration burn-free ceramic filter tube can be maintained.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.