阅读说明：本技术 一种铊中毒脱硝催化剂再生方法 (Thallium-poisoned denitration catalyst regeneration method ) 是由 雷嗣远 卞子君 陈宝康 宋玉宝 孔凡海 王乐乐 杨晓宁 王丽朋 刘鹏 于 2021-08-19 设计创作，主要内容包括：本发明提供一种铊中毒脱硝催化剂再生方法,其包括如下步骤：(1)对铊中毒脱硝催化剂进行预处理；(2)将步骤(1)处理后的铊中毒脱硝催化剂用第一清洗剂进行清洗,第一清洗剂包括硫酸、分散剂和非离子表面活性剂的混合溶液；(3)将步骤(2)处理后的铊中毒脱硝催化剂用第二清洗剂进行清洗,第二清洗剂包括硝酸、硝酸铵和离子螯合剂的混合溶液；(4)对步骤(3)处理后的脱硝催化剂进行干燥、烘焙处理。本发明提供的再生方法,对于催化剂中活性物质钒、钨流失极少,不仅可以将灰分覆盖微孔、碱金属占用活性位造成的失活恢复,还可将铊元素导致的中毒恢复,且不需负载活性物质,具有良好的经济效益；清洗过程不涉及加热等工艺,能耗较低。(The invention provides a thallium poisoning denitration catalyst regeneration method, which comprises the following steps: (1) pretreating a thallium-poisoned denitration catalyst; (2) cleaning the thallium poisoning denitration catalyst treated in the step (1) by using a first cleaning agent, wherein the first cleaning agent comprises a mixed solution of sulfuric acid, a dispersing agent and a nonionic surfactant; (3) cleaning the thallium poisoning denitration catalyst treated in the step (2) by using a second cleaning agent, wherein the second cleaning agent comprises a mixed solution of nitric acid, ammonium nitrate and an ion chelating agent; (4) and (4) drying and baking the denitration catalyst treated in the step (3). The regeneration method provided by the invention has little loss of active substances vanadium and tungsten in the catalyst, can not only cover micropores with ash and recover the inactivation caused by the occupation of active sites by alkali metal, but also recover the poisoning caused by thallium element, does not need to load active substances, and has good economic benefit; the cleaning process does not involve heating and other processes, and the energy consumption is low.)

1. A thallium-poisoned denitration catalyst regeneration method is characterized by comprising the following steps: the method comprises the following steps:

(1) pretreating a thallium-poisoned denitration catalyst;

(2) preparing a first cleaning agent, and cleaning the thallium poisoning denitration catalyst treated in the step (1) by using the first cleaning agent, wherein the first cleaning agent comprises a mixed solution of sulfuric acid, a dispersing agent and a nonionic surfactant;

(3) preparing a second cleaning agent, and cleaning the thallium poisoning denitration catalyst treated in the step (2) by using the second cleaning agent, wherein the second cleaning agent comprises a mixed solution of nitric acid, ammonium nitrate and an ion chelating agent;

(4) and (4) drying and baking the denitration catalyst treated in the step (3).

2. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (2), the dispersing agent comprises one or more of an ethylene oxide condensate, sodium diisooctyl succinate sulfonate and alkyl betaine, and the nonionic surfactant comprises one or more of alkylphenol ethoxylates, long-chain fatty alcohol polyoxyethylene ether, high-carbon fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester and polyoxyethylene alkylamine.

3. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (2), in the first cleaning agent: the mass content of the sulfuric acid ranges from 0.5 to 0.6 wt%, the mass content of the dispersing agent ranges from 1 to 3 wt%, and the mass content of the nonionic surfactant ranges from 1 to 4 wt%.

4. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (3), the ion chelating agent comprises one or more of glycolic acid, organic polyphosphonic acid, fumaric acid (fumaric acid) -propylene sulfonic acid copolymer and ammonium citrate.

5. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (3), in the second cleaning agent: the mass content of the nitric acid is 0.1-0.3 wt%, the mass content of the ammonium nitrate is 1.5-4 wt%, and the mass content of the ion chelating agent is 1.5-3 wt%.

6. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (2), the soaking time of the thallium poisoning denitration catalyst treated in the step (1) in the first cleaning agent is 1-2 hours.

7. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (3), the soaking time of the thallium poisoning denitration catalyst treated in the step (2) in the second cleaning agent is 0.5-2 hours.

8. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: and (3) before the step (3), carrying out clean water bubbling washing on the thallium-poisoned denitration catalyst treated in the step (2) for 0.05-0.2 hour.

9. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: and (4) before the step (4), carrying out clean water bubbling washing on the thallium-poisoned denitration catalyst treated in the step (3) for 0.4-0.6 hour.

10. The method for regenerating a thallium-poisoned denitration catalyst according to claim 1, characterized in that: in the step (1), the pretreatment step comprises dry ash removal, wet ash removal and clean water bubbling, wherein in the dry ash removal step, floating ash on the surface of the thallium poisoning denitration catalyst is removed firstly, and then high-pressure air is used for blowing; in the wet ash removal step, spraying deionized water on the catalyst subjected to dry ash removal treatment for cleaning; in the step of bubbling clean water, the catalyst subjected to wet ash removal treatment is soaked in clean water, and compressed air is adopted for bubbling.

Technical Field

The invention belongs to the field of catalyst regeneration, and particularly relates to a regeneration method of a thallium-poisoned denitration catalyst.

Background

Currently, with the national emphasis on environmental protection, ultra-low emission requirements are moving from the power industry to the non-power industry. In the non-electric industry, cement is a nitrogen oxide emission standard, and the outlet nitrogen oxide can be controlled to 200mg/m through the conventional SNCR method control³The following. However, with the push of ultra-low emission requirements, nitrogen oxides are reduced to 50mg/m³Hereinafter, only the SCR process is usually adopted. In the SCR process, the catalyst is deactivated due to high ash, high alkali metal or the like, and in addition, heavy metal element "thallium" carried from pyrite, which is a cement raw material, also causes catalyst poisoning, resulting in deterioration of denitration performance.

Thallium (Tl) is a heavy metal element and is contained in mineral raw materials such as mica, potassium feldspar, manganese ores, alunite, jarosite and the like with high content, and in the service process of the catalyst, thallium can enter a catalyst pore channel, and is enriched in the catalyst to occupy and destroy an active site of the catalyst, and finally thallium exists on the surface of the catalyst in a layered covering mode of thallium trioxide and thallium sulfate, so that the catalyst is inactivated.

The SCR denitration catalyst thallium poisoning is irreversible, and a conventional regeneration method can only clean conventional ash and alkali metal but cannot regenerate the thallium poisoning catalyst. However, in the prior patent documents, only a method specially aimed at thallium-poisoned catalyst regeneration cannot effectively clean the conventionally deactivated part, and the active material needs to be re-loaded.

The patent application with publication number CN111715210A discloses a regeneration method of thallium poisoning SCR denitration catalyst of cement kiln, which comprises the steps of dedusting, cleaning, soaking, rinsing, drying thallium poisoning SCR denitration catalyst, implanting titanium-vanadium-tungsten soluble active substance for subsequent calcination, thereby recovering the activity of the catalyst, and loading the active substance again; and the concentration of the used sulfuric acid is higher, so that a certain amount of active components of the catalyst are lost, and the operation safety is influenced.

Disclosure of Invention

The invention aims to provide a thallium-poisoned denitration catalyst regeneration method to solve the problems that a conventional deactivated part cannot be effectively cleaned and active substances need to be reloaded.

In order to achieve the purpose, the invention adopts the technical scheme that:

a thallium-poisoned denitration catalyst regeneration method comprises the following steps:

(1) pretreating a thallium-poisoned denitration catalyst;

(2) preparing a first cleaning agent, and cleaning the thallium poisoning denitration catalyst treated in the step (1) by using the first cleaning agent, wherein the first cleaning agent comprises a mixed solution of sulfuric acid, a dispersing agent and a nonionic surfactant;

(3) preparing a second cleaning agent, and cleaning the thallium poisoning denitration catalyst treated in the step (2) by using the second cleaning agent, wherein the second cleaning agent comprises a mixed solution of nitric acid, ammonium nitrate and an ion chelating agent;

(2) (4) drying and baking the denitration catalyst treated in the step (3), wherein the drying and baking steps are preferably as follows: the denitration catalyst is dried for 4-6h at the temperature of 120-140 ℃, and then calcined for 4-6h at the temperature of 350-450 ℃ to complete the regeneration. The calcined catalyst has higher mechanical strength and better wear resistance.

Preferably, in the step (2), the dispersing agent comprises one or more of ethylene oxide condensate, sodium diisooctyl succinate sulfonate and alkyl betaine, and the nonionic surfactant comprises one or more of alkylphenol ethoxylate, long-chain fatty alcohol ethoxylate, high-carbon fatty alcohol ethoxylate, fatty acid polyoxyethylene ester and polyoxyethylene alkylamine.

Preferably, in the step (2), in the first cleaning agent: the mass content of the sulfuric acid is 0.5-0.6 wt%, the mass content of the dispersing agent is 1-1.5 wt%, and the mass content of the nonionic surfactant is 1-1.8 wt%.

Preferably, in step (3), the ion chelating agent comprises one or more of glycolic acid, organic polyphosphonic acid, fumaric acid (fumaric acid) -propylene sulfonic acid copolymer, ammonium citrate.

Preferably, in the step (3), in the second cleaning agent: the mass content of the nitric acid is 0.1-0.15 wt%, the mass content of the ammonium nitrate is 1.5-4 wt%, and the mass content of the ion chelating agent is 1.5-3 wt%.

Preferably, in the step (2), the soaking time of the thallium-poisoned denitration catalyst treated in the step (1) in the first cleaning agent is 1-2 hours, and preferably 1.5 hours.

Preferably, in the step (3), the soaking time of the thallium-poisoned denitration catalyst treated in the step (2) in the second cleaning agent is 0.5-2 hours, and preferably 0.5 hour.

Preferably, before the step (3), the thallium-poisoned denitration catalyst treated in the step (2) is subjected to a clean water bubbling washing for 0.05 to 0.2 hours, preferably 0.1 hour.

Preferably, before the step (4), the thallium-poisoned denitration catalyst treated in the step (3) is subjected to a clean water bubbling washing for 0.4 to 0.6 hours, preferably 0.5 hours.

Preferably, in the step (1), the pretreatment step comprises dry ash removal, wet ash removal and clean water bubbling, wherein in the dry ash removal step, floating ash on the surface of the thallium-poisoned denitration catalyst is removed firstly, and then high-pressure air is used for purging; in the wet ash removal step, spraying deionized water on the catalyst subjected to dry ash removal treatment for cleaning; in the step of bubbling clean water, the catalyst subjected to wet ash removal treatment is soaked in clean water, and compressed air is adopted for bubbling.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

according to the regeneration method provided by the invention, a graded cleaning mode is adopted, firstly, the conventionally-deactivated part of the thallium-poisoned denitration catalyst is cleaned by the first cleaning agent, and secondly, the thallium-poisoned part is cleaned by the second cleaning agent, so that the loss of active substances vanadium and tungsten in the catalyst is very little, not only can the deactivation recovery caused by micropores covered by ash and active sites occupied by alkali metal be realized, but also the poisoning recovery caused by thallium element can be realized, and in addition, the active substances do not need to be loaded, the catalyst surface thallium removal rate is higher, and the method has good economic benefits; the process is simple, the cleaning process does not involve heating and other processes, and the energy consumption is low; the operation is safe, the service life of the regenerated catalyst is prolonged, and the method has good popularization prospect.

Detailed Description

The invention will be further described with reference to the examples shown below.

The embodiment provides a thallium-poisoned denitration catalyst regeneration method, preferably aiming at an SCR denitration deactivation catalyst in the cement industry, which comprises the following steps:

(1) pretreating a thallium-poisoned denitration catalyst;

the pretreatment step comprises the following steps of dry ash removal, wet ash removal and clean water bubbling in sequence, wherein the dry ash removal step is carried out firstly: firstly, conveying the inactivated thallium poisoning catalyst into an ash removal room, manually removing floating ash on the surface of the thallium poisoning catalyst, and blowing by using high-pressure air to remove ash in macroscopic pore channels as much as possible; and then carrying out wet ash removal: spraying deionized water on the catalyst subjected to dry ash removal treatment for cleaning, for example, moving the thallium poisoning catalyst to a regeneration spraying system, and spraying deionized water on the thallium poisoning catalyst by using a high-pressure water gun with appropriate pressure for primary cleaning; then, carrying out clear water bubbling: soaking the catalyst subjected to wet ash removal treatment in clean water, and simultaneously bubbling the catalyst by using compressed air, specifically placing the catalyst in a regeneration cleaning tank, soaking the catalyst in the clean water for 0.5-2 hours (preferably 1 hour), and simultaneously bubbling the catalyst in the bottom of the cleaning tank by using the compressed air to soften dirt.

(3) Preparing a first cleaning agent, and cleaning the thallium poisoning denitration catalyst treated in the step (1) by using the first cleaning agent, wherein the cleaning process is as follows: and (3) moving the pretreated thallium poisoning denitration catalyst into an ultrasonic tank, adding a prepared first cleaning agent, starting ultrasonic sound waves (good ultrasonic cleaning effect), and cleaning comprehensively for 1-2 hours, preferably for 1.5 hours.

The first cleaning agent comprises a mixed solution of sulfuric acid, a dispersing agent and a nonionic surfactant, and when the first cleaning agent is prepared: adding sulfuric acid, a dispersant and a nonionic surfactant with preset weight into deionized water, stirring uniformly at normal temperature, and standing.

Wherein, the dispersant comprises one or more of ethylene oxide condensate, sodium diisooctyl succinate sulfonate and alkyl betaine, and the ethylene oxide condensate is preferably used only. The nonionic surfactant comprises one or more of alkylphenol polyoxyethylene, long-chain fatty alcohol polyoxyethylene, high-carbon fatty alcohol polyoxyethylene, fatty acid polyoxyethylene and polyoxyethylene alkylamine, preferably only alkylphenol polyoxyethylene is adopted.

In the first cleaning agent: the mass content of the sulfuric acid is 0.5-0.6 wt%, the mass content of the dispersing agent is 1-3 wt%, and the mass content of the nonionic surfactant is 1-4 wt%.

The sulfuric acid is used as a main acid source of the cleaning agent and can partially dissolve ash and scale components in the pores of the thallium-poisoned denitration catalyst. The condensate of the dispersant (such as ethylene oxide) has better dispersion performance, can ensure that ash scale stripped from the catalyst is not easy to agglomerate, keeps dispersion and is more beneficial to cleaning and removal. The nonionic surfactant (such as alkylphenol ethoxylates) is used as an effective component of the detergent, can change the contact performance of the ash and dirt on the surface of the catalyst, and promotes the stripping and removal of the ash and dirt on the surface of the pore channel.

Preferably, the thallium-poisoned denitration catalyst treated in the step (2) is subjected to clean water bubbling flushing to remove residues of the first cleaning agent on the surface for 0.05-0.2 hours, preferably 0.1 hour.

(4) Preparing a second cleaning agent, and cleaning the thallium-poisoned denitration catalyst treated in the step (2) by using the second cleaning agent, wherein the cleaning process is as follows: and moving the thallium-poisoned denitration catalyst into an ultrasonic tank, adding a prepared second cleaning agent, starting ultrasonic sound waves (good ultrasonic cleaning effect), and cleaning comprehensively for 0.5-2 hours, preferably for 1 hour.

The second cleaning agent comprises a mixed solution of nitric acid, ammonium nitrate and an ion chelating agent, and when the second cleaning agent is prepared, nitric acid, ammonium nitrate and the ion chelating agent with preset weight are added into deionized water, and the mixture is stirred uniformly at normal temperature and then stands.

Wherein the ion chelating agent comprises one or more of glycolic acid, organic polyphosphonic acid, fumaric acid (fumaric acid) -propylene sulfonic acid copolymer, and ammonium citrate, preferably only glycolic acid is used.

In the second cleaning agent: the mass content of the nitric acid is 0.1-0.3 wt%, the mass content of the ammonium nitrate is 1.5-4 wt%, and the mass content of the ion chelating agent is 1.5-3 wt%.

Preferably, the thallium-poisoned denitration catalyst treated in the step (3) is subjected to clean water bubbling flushing to remove residues of the first cleaning agent on the surface for 0.4-0.6 hour, preferably 0.5 hour.

The nitric acid is used as an acid auxiliary source, has extremely strong dissolving performance on the metal thallium, and can efficiently realize comprehensive and rapid removal and dissolution of the metal thallium in the catalyst; the ammonium nitrate has stronger oxidizability, can carry out a complex reaction with the metal thallium, and enhances the removal of the washed metal thallium; the ion chelating agent (such as glycolic acid) has ion chelating performance, can be complexed with various metal impurities, and can effectively remove the thallium metal component in the catalyst.

(5) Drying and baking the denitration catalyst treated in the step (3), wherein the drying and baking steps are preferably as follows: the denitration catalyst is dried for 4-6h at the temperature of 120-140 ℃, and then calcined for 4-6h at the temperature of 350-450 ℃ to complete the regeneration.

The regeneration method adopts two cleaning agent grades, and can carry out full-process regeneration on the thallium poisoning catalyst: firstly, cleaning a thallium-poisoned denitration catalyst by using a first cleaning agent, and simultaneously removing poisoning of conventional metals such as alkali metals and the like in the thallium-poisoned denitration catalyst on the basis of mainly removing substances such as silicon, aluminum, calcium, magnesium and the like in conventional ash scale on the thallium-poisoned denitration catalyst; and cleaning the cleaned thallium poisoning denitration catalyst by using a second cleaning agent, and mainly removing thallium metal and other heavy metals with high efficiency.

Example one

This example provides a method for regenerating a thallium-poisoned denitration catalyst, which includes the following steps:

(1) pretreating a thallium-poisoned denitration catalyst;

(2) preparing a first cleaning agent: adding 0.55 wt% of sulfuric acid, 1.3 wt% of ethylene oxide condensation compound and 1.4 wt% of alkylphenol polyoxyethylene into deionized water, stirring uniformly at normal temperature, standing, cleaning the thallium poisoning denitration catalyst treated in the step (1) by using a first cleaning agent, and carrying out clean water bubbling washing on the catalyst after cleaning to remove surface residues for 0.1 hour;

(3) preparing a second cleaning agent: adding 0.13 wt% of nitric acid, 2.5 wt% of ammonium nitrate, 2.4 wt% of glycolic acid and deionized water, stirring uniformly at normal temperature, and cleaning the thallium poisoning denitration catalyst treated in the step (2) by using a second cleaning agent; after cleaning, carrying out clean water bubbling washing on the catalyst to remove surface residues for 0.5 hour;

(4) and (4) drying and baking the denitration catalyst treated in the step (3).

Example two

This example provides a method for regenerating a thallium-poisoned denitration catalyst, which includes the following steps:

(1) pretreating a thallium-poisoned denitration catalyst;

(2) preparing a first cleaning agent: adding 0.5 wt% of sulfuric acid, 0.9 wt% of ethylene oxide condensation compound and 1.1 wt% of alkylphenol polyoxyethylene into deionized water, stirring uniformly at normal temperature, standing, cleaning the thallium poisoning denitration catalyst treated in the step (1) by using a first cleaning agent, and carrying out clean water bubbling washing on the catalyst after cleaning to remove surface residues for 0.1 hour;

(3) preparing a second cleaning agent: adding 0.2 wt% of nitric acid, 4 wt% of ammonium nitrate, 3 wt% of glycolic acid and deionized water, stirring uniformly at normal temperature, and cleaning the thallium poisoning denitration catalyst treated in the step (2) by using a second cleaning agent; after cleaning, carrying out clean water bubbling washing on the catalyst to remove surface residues for 0.5 hour;

(4) and (4) drying and baking the denitration catalyst treated in the step (3).

EXAMPLE III

This example provides a method for regenerating a thallium-poisoned denitration catalyst, which includes the following steps:

(1) pretreating a thallium-poisoned denitration catalyst;

(2) preparing a first cleaning agent: adding 0.6 wt% of sulfuric acid, 1.8 wt% of ethylene oxide condensation compound and 2.0 wt% of alkylphenol polyoxyethylene into deionized water, stirring uniformly at normal temperature, standing, cleaning the thallium poisoning denitration catalyst treated in the step (1) by using a first cleaning agent, and carrying out clean water bubbling washing on the catalyst after cleaning to remove surface residues for 0.1 hour;

(3) preparing a second cleaning agent: adding 0.10 wt% of nitric acid, 1.8 wt% of ammonium nitrate, 1.5 wt% of glycolic acid and deionized water, stirring uniformly at normal temperature, and cleaning the thallium poisoning denitration catalyst treated in the step (2) by using a second cleaning agent; after cleaning, carrying out clean water bubbling washing on the catalyst to remove surface residues for 0.5 hour;

(4) and (4) drying and baking the denitration catalyst treated in the step (3).

Comparative example

The thallium-poisoned denitration catalyst provided in the present example is different from the first example in that: this comparative example only pretreats the thallium-poisoned denitration catalyst.

After an SCR denitration system of a certain cement plant operates for one year, the ammonia consumption of a reaction site is increased, the ammonia escape is increased, and the denitration performance is poor. A thallium poisoning denitration catalyst sample monomer is selected in the reactor, the monomer is 13 multiplied by 13 holes, and the length is 980 mm. The thallium-poisoned denitration catalyst sample monomer is regenerated in a laboratory by using the regeneration method, and the sample before regeneration (comparative example) and after regeneration (example) is subjected to physicochemical analysis and activity test, a full-size Chinese-style bench is adopted, and the detection results are as follows:

test 1

And (3) detecting activity: according to DL/T1286-. The simulated gas composition was: flue gas amount 168m³/h，O₂(2.5vol.％)、HO₂(7vol.％)N₂As a carrier gas, NO (350 mg/Nm)³) NH is introduced into the reactor in a molar ratio of 1 to 1 of ammonia nitrogen₃The test temperature was 240 ℃.

Activity results: the activity of the catalyst of the comparative example (before regeneration) was 20.5m/h, and the activity of the catalysts of examples one to three (after regeneration) was restored to 28.6m/h, 28.0m/h and 28.1m/h, respectively, as shown in Table 1. The activity of the regenerated catalyst is greatly improved, which shows that the overall performance of the regenerated catalyst is well recovered.

TABLE 1 catalyst of comparative example (before regeneration), catalyst of examples one to three (after regeneration) Activity (in m/h)

Test 2

Detecting the microscopic specific surface area: the specific surface area of the catalyst is measured by using an ASAP 2460BET specific surface instrument.

Specific surface area results: the catalyst of the comparative example (before regeneration) had a microscopic specific surface area of: 45.23m²The microscopic specific surface area of the catalysts of examples one to three (after regeneration) was raised to 56.85m²/mg、57.91m²Mg and 56.80m²In mg, see Table 2. The micro pore channel of the regenerated catalyst is well dredged, and the reaction area is recovered.

Table 2 microscopic specific surface area (unit m) of catalyst of comparative example (before regeneration), catalyst of examples one to three (after regeneration)²/mg)

Test 3

The detection results of the main components are as follows:

(1) the thallium concentration in the catalyst sample was measured using ICP, and the thallium concentration in the catalyst of comparative example (before regeneration) was 7.4%, and the thallium concentrations in the catalysts of examples one to three (after regeneration) were 0.70%, 0.79%, and 0.95%, respectively, as shown in table 3. Indicating that a large amount of thallium metal is removed after regeneration.

Table 3 thallium concentration table (unit%)

(2) XRF was used to detect other components in the catalyst sample, detailed in the table below:

table 4 composition table (unit%)

Composition (I)	Comparative example	Example one	Example two	EXAMPLE III
					TiO2	72.48	73.30	71.89	72.64
MoO3	7.69	7.49	7.34	7.07
					WO3	3.29	3.10	3.15	3.09
V2O5	2.30	2.12	2.15	2.06
					SiO2	8.94	3.24	4.17	3.31
CaO	3.94	0.80	1.10	0.82
					SO3	2.96	0.91	1.13	0.92
Al2O3	2.31	0.49	0.61	0.45
					MgO	1.15	0.35	0.40	0.37
Na2O	1.23	0.26	0.34	0.22
					K2O	1.45	0.17	0.26	0.15

As can be seen from Table 4 above, active material V in the regenerated catalyst sample₂O₅、WO₃、MoO₃Little loss, foreign material SiO₂、CaO、Al₂O₃、MgO、Na₂O、K₂The O is clearly removed, thus demonstrating good regeneration.

The activity and the surface area of the catalyst regenerated by the regeneration method are remarkably recovered, the influence on active components vanadium and tungsten is small, multiple losses are avoided, additional active substances do not need to be supplemented, and the method has good economic benefit.

According to the regeneration method provided by the invention, a graded cleaning mode is adopted, firstly, the conventional deactivated part of the thallium-poisoned denitration catalyst is cleaned, and secondly, the thallium-poisoned part is cleaned, so that the loss of active substances vanadium and tungsten in the catalyst is very little, not only can the deactivation recovery caused by that micropores are covered by ash and alkali metal occupies active sites, but also the poisoning recovery caused by thallium element can be realized, and active substances do not need to be loaded; the process is simple, the cleaning process does not involve heating and other processes, and the energy consumption is low.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.