阅读说明：本技术 一种失活波纹板脱硝催化剂的再生方法 (Regeneration method of inactivated corrugated plate denitration catalyst ) 是由 蒋宗安 陈志坤 刘炜 肖雷 薛璐 冯艳婷 杨莎莎 姚元庆 侯康杰 于 2020-06-05 设计创作，主要内容包括：本发明属于催化剂再生技术领域,涉及一种失活波纹板脱硝催化剂的再生方法,包括：预处理,对失活波纹板脱硝催化剂模块进行吹灰、清洗和干燥处理；向预处理后的失活波纹板脱硝催化剂模块中添加复孔剂完成复孔,同时去除沉积的有毒物质；向复孔后的失活波纹板脱硝催化剂模块表面添加强化剂,强化其表面活性和耐磨性能；向强化处理后的失活波纹板脱硝催化剂模块添加活性液进行活化处理；对活化处理后的波纹板脱硝催化剂模块进行干燥煅烧处理。本发明通过采用吹灰、清洗、干燥、复孔、强化、活化和干燥煅烧的再生工艺,实现了失活波纹板脱硝催化剂模块的再生,避免了对催化剂强度和性能造成的损失,使催化剂再生后可以循环使用,并保证了脱硝效率。(The invention belongs to the technical field of catalyst regeneration, and relates to a regeneration method of an inactivated corrugated plate denitration catalyst, which comprises the following steps: preprocessing, namely performing soot blowing, cleaning and drying treatment on the deactivated corrugated plate denitration catalyst module; adding a pore-complexing agent into the pretreated deactivated corrugated plate denitration catalyst module to complete pore-complexing, and removing deposited toxic substances; adding a reinforcer to the surface of the deactivated corrugated plate denitration catalyst module after pore recombination to strengthen the surface activity and wear resistance of the deactivated corrugated plate denitration catalyst module; adding active liquid into the strengthened deactivated corrugated plate denitration catalyst module for activation treatment; and drying and calcining the activated corrugated plate denitration catalyst module. According to the invention, by adopting the regeneration process of soot blowing, cleaning, drying, pore re-forming, strengthening, activating and drying and calcining, the regeneration of the deactivated corrugated plate denitration catalyst module is realized, the loss of the strength and performance of the catalyst is avoided, the catalyst can be recycled after regeneration, and the denitration efficiency is ensured.)

1. A regeneration method of a deactivated corrugated plate denitration catalyst, which is characterized by comprising the following steps:

1) preprocessing, namely performing soot blowing, cleaning and drying treatment on the deactivated corrugated plate denitration catalyst module;

2) adding a pore-complexing agent into the pretreated deactivated corrugated plate denitration catalyst module to complete pore-complexing, and removing deposited toxic substances;

3) adding a reinforcer to the surface of the deactivated corrugated plate denitration catalyst module after pore recombination to strengthen the surface activity and wear resistance of the deactivated corrugated plate denitration catalyst module;

4) adding active liquid into the strengthened deactivated corrugated plate denitration catalyst module for activation treatment;

5) and drying and calcining the activated corrugated plate denitration catalyst module.

2. The method according to claim 1, wherein the step 1) specifically comprises:

1.1) blowing ash, namely putting an inactivated corrugated plate denitration catalyst module into an ash blowing system, and intermittently blowing by using compressed air, wherein the interval time is 5-60 min each time, the pressure of the compressed air is 0.3-1 Mpa, and the flow is 30-100 Nm³/min；

1.2) cleaning, namely further cleaning fly ash on the surface and in pore channels of the deactivated corrugated plate denitration catalyst module subjected to soot blowing treatment by using fresh water, wherein the cleaning mode adopts spray type cleaning, and the cleaning time is 0.5-3 h;

1.3) drying, and draining the cleaned deactivated corrugated plate denitration catalyst module by gravity.

3. The method as claimed in claim 2, wherein the pressure of the compressed air in step 1.1) is 0.6Mpa and the flow rate is 60Nm³/min。

4. The method according to claim 1, wherein the pore complexing agent in the step 2) comprises dimethyl sulfoxide or hexamethylenetetramine, and the mass concentration of the pore complexing agent is 0.1-1%; the secondary hole is operated at normal temperature and normal pressure, and water is drained by means of gravity after the secondary hole is completed.

5. The method according to claim 4, wherein the mass concentration of the pore-complexing agent is 0.15%.

6. The method according to claim 1, wherein the enhancer in the step 3) comprises alkylphenol ethoxylate or fatty alcohol ethoxylate, and the mass concentration of the enhancer is 0.1-1%; the strengthening is operated at normal temperature and normal pressure, and the water is drained by means of gravity after soaking.

7. The method according to claim 1, wherein the active solution in the step 4) is an aqueous solution of ammonium metavanadate and ammonium metatungstate dissolved in oxalic acid and monoethanolamine, and the content of vanadium in the active solution is 0.5-2.5%, and the content of tungsten in the active solution is 3-10%.

8. The method as claimed in claim 1, wherein the step 4) of activating is completed and then draining is performed by gravity.

9. The method according to claim 1, wherein the step 5) comprises in particular:

5.1) drying, namely conveying the activated corrugated plate denitration catalyst module into a drying kiln for heating at the temperature of 50-80 ℃ for 3-10 h;

5.2) calcining, wherein after drying operation is finished, the temperature of the drying kiln is gradually increased to 260-350 ℃, and the calcining time is 3-10 h.

Technical Field

The invention belongs to the technical field of catalyst regeneration, and relates to a regeneration method of an inactivated corrugated plate denitration catalyst.

Background

The SCR denitration technology is a flue gas denitration technology widely applied in the world at present, and the catalyst is the most important part in the whole system. The service life of the catalyst is 24000 hours, so that the catalyst may be deactivated and needs to be replaced after 3 to 5 years of operation. In addition, the waste vanadium-titanium-based denitration catalyst is listed in the name of dangerous waste by the national ministry of environmental protection. This means that the enterprise not only needs to purchase new catalyst, but also expends money for disposing of spent catalyst. However, the regenerated deactivated catalyst can be put into use again after being cleaned and supplemented with active ingredients, and the regeneration cost is only one third of the cost of newly purchased catalyst, so that it is very necessary to regenerate and utilize the regenerated denitration catalyst.

The commonly used denitration catalyst is divided into three types, namely a honeycomb type catalyst, a flat plate type catalyst and a corrugated plate type catalyst, the market share of the corrugated plate type catalyst is increased in recent years, and the problem that the catalyst needs to be replaced or regenerated after being used for 3 years is also faced. At present, most of related regeneration processes relate to regeneration of honeycomb denitration catalysts, and fewer regeneration methods relate to regeneration of deactivated corrugated plate denitration catalysts. The catalyst may be deactivated by various reasons, and the deactivation includes reversible deactivation and irreversible deactivation. The reversibly inactivated catalyst should be preferentially recycled to reduce environmental pollution and reduce the operation cost of enterprises, otherwise, the denitration catalyst is used as a dangerous waste, and if the denitration catalyst is not properly disposed, the environmental pollution is serious.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a regeneration method of an inactivated corrugated plate denitration catalyst, so that the catalyst can be recycled after regeneration, and the denitration efficiency is ensured.

The purpose of the invention is realized by the following technical scheme:

the regeneration method of the deactivated corrugated plate denitration catalyst comprises the following steps:

1) preprocessing, namely performing soot blowing, cleaning and drying treatment on the deactivated corrugated plate denitration catalyst module;

2) adding a pore-complexing agent into the pretreated deactivated corrugated plate denitration catalyst module to complete pore-complexing, and removing deposited toxic substances;

3) adding a reinforcer to the surface of the deactivated corrugated plate denitration catalyst module after pore recombination to strengthen the surface activity and wear resistance of the deactivated corrugated plate denitration catalyst module;

4) adding active liquid into the strengthened deactivated corrugated plate denitration catalyst module for activation treatment;

5) and drying and calcining the activated corrugated plate denitration catalyst module.

Further, the step 1) specifically comprises:

1.1) blowing ash, namely putting an inactivated corrugated plate denitration catalyst module into an ash blowing system, and intermittently blowing by using compressed air, wherein the interval time is 5-60 min each time, the pressure of the compressed air is 0.3-1 Mpa, and the flow is 30-100 Nm³/min；

1.2) cleaning, namely further cleaning fly ash on the surface and in pore channels of the deactivated corrugated plate denitration catalyst module subjected to soot blowing treatment by using fresh water, wherein the cleaning mode adopts spray type cleaning, and the cleaning time is 0.5-3 h;

1.3) drying, and draining the cleaned deactivated corrugated plate denitration catalyst module by gravity.

Further, the pressure of the compressed air in the step 1.1) is 0.6Mpa, and the flow rate is 60Nm³/min。

Further, the pore-complexing agent in the step 2) comprises dimethyl sulfoxide or hexamethylenetetramine, and the mass concentration of the pore-complexing agent is 0.1-1%; the secondary hole is operated at normal temperature and normal pressure, and water is drained by means of gravity after the secondary hole is completed.

Further, the mass concentration of the pore-complexing agent is 0.15%.

Further, the reinforcer in the step 3) comprises alkylphenol polyoxyethylene or fatty alcohol polyoxyethylene ether, and the mass concentration of the reinforcer is 0.1-1%; the strengthening is operated at normal temperature and normal pressure, and the water is drained by means of gravity after soaking.

Further, the active solution in the step 4) is an aqueous solution prepared by dissolving ammonium metavanadate and ammonium metatungstate in oxalic acid and monoethanolamine, wherein the content of vanadium in the active solution is 0.5-2.5%, and the content of tungsten in the active solution is 3-10%.

Further, draining water by means of gravity after the activation treatment in the step 4) is completed.

Further, the step 5) specifically comprises:

5.1) drying, namely conveying the activated corrugated plate denitration catalyst module into a drying kiln for heating at the temperature of 50-80 ℃ for 3-10 h;

5.2) calcining, wherein after drying operation is finished, the temperature of the drying kiln is gradually increased to 260-350 ℃, and the calcining time is 3-10 h.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects: according to the unique appearance structure and physicochemical property characteristics of the corrugated plate denitration catalyst, the regeneration of the deactivated corrugated plate denitration catalyst module is realized by adopting the regeneration process of soot blowing, cleaning, drying, pore recombination, strengthening, activating and drying and calcining, the loss of the strength and the performance of the catalyst is avoided, the catalyst can be recycled after regeneration, and the denitration efficiency is ensured.

Detailed Description

The present invention is described in further detail below with reference to examples: