阅读说明：本技术 失活scr催化剂改性再生实现同步脱硝脱二噁英的方法 (Method for realizing synchronous denitration and dioxin removal by modification and regeneration of deactivated SCR catalyst ) 是由 何川 张发捷 孔凡海 王乐乐 鲍强 姚燕 李乐田 马云龙 卞子君 于 2020-11-06 设计创作，主要内容包括：本发明一种失活SCR催化剂改性再生实现同步脱硝脱二噁英的方法、产品及应用,包括以下步骤：失活催化剂清灰与清洗、活性物质改性负载、干燥和煅烧,得到同步脱硝脱二噁英的SCR催化剂产品。本发明提供的失活SCR催化剂改性再生实现同步脱硝脱二噁英的方法、产品及应用,通过清洗液对失活SCR催化剂清洗,在强力去除催化剂表面杂质的基础上最大范围地保留原有催化剂中的活性组分,使用CeO-2、V-2O-5、Co-2O-3作为失活SCR催化剂改性再生的活性物质,以硝酸铈、硫酸氧钒、硝酸钴作为活性物质前驱体,各活性物质有效负载,能够制备适用于垃圾焚烧烟气的同步脱硝脱二噁英催化剂,大幅降低垃圾焚烧烟气处理成本,环保效益显著。(The invention relates to a method for realizing synchronous denitration and dioxin removal by modification and regeneration of an inactivated SCR catalyst, a product and application thereof, wherein the method comprises the following steps: and (3) deashing and cleaning the deactivated catalyst, modifying and loading active substances, drying and calcining to obtain the SCR catalyst product for synchronously denitrating and removing dioxin. The method, the product and the application for realizing synchronous denitration and dioxin removal by modification and regeneration of the deactivated SCR catalyst provided by the invention are characterized in that the deactivated SCR catalyst is cleaned by cleaning fluid and is strongly removedThe active components in the original catalyst are retained to the maximum extent on the basis of impurities on the surface of the catalyst, and CeO is used 2 、V 2 O 5 、Co 2 O 3 As the active substances modified and regenerated by the deactivated SCR catalyst, cerium nitrate, vanadyl sulfate and cobalt nitrate are used as active substance precursors, and the active substances are effectively loaded, the synchronous denitration and dioxin removal catalyst suitable for waste incineration flue gas can be prepared, the waste incineration flue gas treatment cost is greatly reduced, and the environmental protection benefit is remarkable.)

1. A method for realizing synchronous denitration and dioxin removal by modification and regeneration of a deactivated SCR catalyst is characterized by comprising the following steps:

first, ash cleaning and cleaning of deactivated catalyst

Cleaning the deactivated catalyst with cleaning liquid after ash removal, and drying for later use;

secondly, active substance modification loading, drying and calcining;

preparing a negative carrier liquid;

dipping the sample obtained in the step one in a loading solution for 0.5-3 min; and then placing the catalyst in an oven, drying the catalyst for 6-24 hours at 95-130 ℃, then placing the catalyst in a muffle furnace, and calcining the catalyst for 3-10 hours at 400-600 ℃ to complete the modification regeneration of the deactivated SCR catalyst, thereby obtaining the SCR catalyst product with synchronous denitration and dioxin removal.

2. The method for realizing synchronous denitration and dioxin removal through modified regeneration of the deactivated SCR catalyst according to claim 1, wherein in the first step, the cleaning solution comprises the following components in percentage by weight:

3.0-6.0 wt% of coconut oil fatty acid diethanolamide, 1-5.0 wt% of alkyl glycoside, 0-1.0 wt% of JFC penetrant, 0.5-2.0 wt% of sodium carbonate, 0.5-2.0 wt% of sulfuric acid and the balance of water.

3. The method for realizing synchronous denitration and dioxin removal by modification and regeneration of the deactivated SCR catalyst according to claim 1, wherein in the first step, the preparation of the cleaning solution comprises the following steps:

sequentially adding 3.0-6.0 wt% of coconut oil fatty acid diethanolamide, 1-5.0 wt% of alkyl glycoside, 0-1.0 wt% of JFC penetrant, 0.5-2.0 wt% of sodium carbonate and 0.5-2.0 wt% of sulfuric acid into water, and uniformly stirring to obtain the required cleaning solution.

4. The method for realizing synchronous denitration and dioxin removal by modification and regeneration of the deactivated SCR catalyst according to claim 1, wherein in the first step, the step of cleaning the deactivated SCR catalyst by the cleaning solution includes:

placing the deactivated SCR catalyst sample in deionized water to be washed for 30-90 min; taking out and placing the mixture in the cleaning solution to soak and clean at normal temperature for 30-90 min, wherein ultrasonic disturbance is assisted in the cleaning process; and finally, drying the cleaned sample in an oven at 95-130 ℃ for 6-24 h, thus finishing the cleaning process.

5. The method for realizing synchronous denitration and dioxin removal by modification and regeneration of the deactivated SCR catalyst according to claim 1, wherein in the second step, the preparation of the negative carrier liquid comprises the following steps:

firstly, adding 1.0-5.0 wt% of cosolvent oxalic acid into water, then sequentially adding 1.0-5.0 wt% of cerium nitrate, 1.5-6.0 wt% of vanadyl sulfate and 0-4.0 wt% of cobalt nitrate, and fully and uniformly stirring to obtain the required negative carrier liquid.

6. An SCR catalyst for synchronous denitration and dioxin removal is characterized by being prepared by the method for realizing synchronous denitration and dioxin removal by modifying and regenerating the deactivated SCR catalyst according to any one of claims 1 to 5.

7. The synchronous denitration and dioxin removal SCR catalyst according to claim 6, characterized in that the product comprises the following components in percentage by weight: 1.0 to 3.5 wt% of CeO₂、0.5～5.0wt％V₂O₅、0～5.0wt％Co₂O₃、1.0～10.0wt％WO₃、77.0～90.0wt％TiO₂。

8. The use of the SCR catalyst for simultaneous denitration and dioxin removal according to claim 6 in the denitration and dioxin removal of waste incineration flue gas.

Technical Field

The invention belongs to the technical field of air pollution control and catalyst regeneration, and particularly relates to a method for realizing synchronous denitration and dioxin removal by modification and regeneration of an inactivated SCR catalyst, a product and application.

Background

With the progress and development of society, the waste incineration technology has become an important means for harmless disposal of solid waste in China. The waste incineration flue gas contains a large amount of nitrogen oxides (NOx) and dioxins (Dioxin), and can cause serious pollution to the atmospheric environment. Nitrogen oxides are important pollutants causing acid rain, haze and photochemical pollution, and China has long provided strict control standards for emission of the nitrogen oxides. Dioxin is discharged into the atmospheric environment, can cause great harm to exposed people, and has serious carcinogenicity, teratogenicity, immunotoxicity, reproductive toxicity, neurotoxicity and chronic toxicity. Therefore, the waste incineration facility must strictly control the emission levels of nitrogen oxides and dioxins to minimize secondary pollution to the atmospheric environment.

The Selective Catalytic Reduction (SCR) technology is the most mature and effective NOx removal means at present, and is widely applied to most coal-fired power generating units and partial waste incineration facilities in China. Conventional commercial SCR catalysts have a limited catalytic oxidative degradation of dioxins. If the SCR catalyst is applied to the degradation of dioxin in waste incineration flue gas, the formula of the SCR catalyst needs to be adjusted to improve the oxidation capability of the dioxin catalyst and adapt to the waste incineration flue gas.

The activity of the SCR catalyst is gradually reduced along with the running time, and the periodic efficiency improvement is needed. Compared with the replacement of a new catalyst, the regeneration technology of the active catalyst has obvious advantages in the aspects of performance recovery, price, reduction of solid waste secondary pollution and the like, and is an important measure for improving the efficiency of SCR denitration performance and reducing the operation cost. The invention aims at a catalyst regeneration technology, modifies the conventional deactivated SCR catalyst in the regeneration process, and finally prepares the synchronous denitration and dioxin removal catalyst suitable for waste incineration flue gas.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide a method, a product and application for realizing synchronous denitration and dioxin removal by modification and regeneration of an inactivated SCR catalyst.

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

a method for realizing synchronous denitration and dioxin removal by modification and regeneration of a deactivated SCR catalyst comprises the following steps:

first, ash cleaning and cleaning of deactivated catalyst

Cleaning the deactivated catalyst with cleaning liquid after ash removal, and drying for later use;

secondly, active substance modification loading, drying and calcining;

preparing a negative carrier liquid;

dipping the sample obtained in the step one in a loading solution for 0.5-3 min; and then placing the catalyst in an oven, drying the catalyst for 6-24 hours at 95-130 ℃, then placing the catalyst in a muffle furnace, and calcining the catalyst for 3-10 hours at 400-600 ℃ to complete the modification regeneration of the deactivated SCR catalyst, thereby obtaining the SCR catalyst product with synchronous denitration and dioxin removal.

Further, in the first step, the cleaning solution comprises the following components in percentage by weight:

3.0-6.0 wt% of coconut oil fatty acid diethanolamide, 1-5.0 wt% of alkyl glycoside, 0-1.0 wt% of JFC penetrant, 0.5-2.0 wt% of sodium carbonate, 0.5-2.0 wt% of sulfuric acid and the balance of water.

Further, in the first step, the preparation of the cleaning solution includes:

sequentially adding 3.0-6.0 wt% of coconut oil fatty acid diethanolamide, 1-5.0 wt% of alkyl glycoside, 0-1.0 wt% of JFC penetrant, 0.5-2.0 wt% of sodium carbonate and 0.5-2.0 wt% of sulfuric acid into water, and uniformly stirring to obtain the required cleaning solution.

Further, in the first step, the step of cleaning the deactivated SCR catalyst with the cleaning solution includes:

placing the deactivated SCR catalyst sample in deionized water to be washed for 30-90 min; taking out and placing the mixture in the cleaning solution to soak and clean at normal temperature for 30-90 min, wherein ultrasonic disturbance is assisted in the cleaning process; and finally, drying the cleaned sample in an oven at 95-130 ℃ for 6-24 h, thus finishing the cleaning process.

Further, in step two, the preparation of the negative carrier liquid comprises:

firstly, adding 1.0-5.0 wt% of cosolvent oxalic acid into water, then sequentially adding 1.0-5.0 wt% of cerium nitrate, 1.5-6.0 wt% of vanadyl sulfate and 0-4.0 wt% of cobalt nitrate, and fully and uniformly stirring to obtain the required negative carrier liquid.

The invention discloses an SCR catalyst for synchronous denitration and dioxin removal, which is prepared by adopting the method for realizing synchronous denitration and dioxin removal by modifying and regenerating the deactivated SCR catalyst according to any one of claims 1 to 5.

Further, the SCR catalyst product for synchronous denitration and dioxin removal comprises the following components in percentage by weight: 1.0 to 3.5 wt% of CeO₂、0.5～5.0wt％V₂O₅、0～5.0wt％Co₂O₃、1.0～10.0wt％WO₃、77.0～90.0wt％TiO₂。

The invention discloses an application of an SCR catalyst for synchronous denitration and dioxin removal in denitration and dioxin removal of waste incineration flue gas.

Compared with the prior art, the invention has the beneficial effects that:

the invention discloses a method for realizing synchronous denitration and dioxin removal by modification and regeneration of an inactivated SCR catalyst, a product and application thereof, wherein the method comprises the following steps: and (3) deashing and cleaning the deactivated catalyst, modifying and loading active substances, drying and calcining to obtain the SCR catalyst product for synchronously denitrating and removing dioxin. The method, the product and the application for realizing synchronous denitration and dioxin removal by modification and regeneration of the deactivated SCR catalyst provided by the invention have the advantages that the deactivated SCR catalyst is cleaned by the cleaning solution, and the active component V in the original catalyst is reserved to the maximum extent on the basis of strongly removing impurities on the surface of the catalyst₂O₅、WO₃、TiO₂Using CeO₂、V₂O₅、Co₂O₃As an active substance for modification and regeneration of the deactivated SCR catalyst, cerium nitrate, vanadyl sulfate and cobalt nitrate are used as an active substance precursor, a negative carrier liquid is prepared, active substance modification loading, drying and calcining are completed, modification and regeneration of the deactivated SCR catalyst are realized, each active substance can be effectively loaded, impurities such as Si, Al and the like on the surface of the deactivated SCR catalyst can be effectively removed, a synchronous denitration and dioxin removal catalyst suitable for waste incineration flue gas can be prepared, the waste incineration flue gas treatment cost is greatly reduced, the existing resources are effectively utilized, the environmental protection benefit is remarkable, and the application prospect is wide.

Drawings

Fig. 1 is a block diagram of the working principle of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.

As shown in fig. 1, a method for realizing synchronous denitration and dioxin removal by modification and regeneration of an inactivated SCR catalyst mainly comprises the steps of ash removal and cleaning of the inactivated SCR catalyst, modification and loading of active substances, drying, calcination and the like, and specifically comprises the following steps:

first, deashing and cleaning of deactivated SCR catalyst

1) Cleaning surface fly ash of honeycomb type deactivated SCR catalyst (hereinafter referred to as deactivated SCR catalyst) of a conventional coal-fired generator set, and blowing by adopting compressed air to ensure that all pore passages of the deactivated SCR catalyst are smooth;

2) the cleaning solution disclosed by the invention is used for cleaning the deactivated SCR catalyst, and the active component V in the original catalyst is reserved to the maximum extent on the basis of strongly removing impurities on the surface of the deactivated SCR catalyst₂O₅、WO₃、TiO₂And the like.

In the step 2), the cleaning solution comprises the following components in percentage by weight:

3.0-6.0 wt% of coconut oil fatty acid diethanolamide, 1-5.0 wt% of alkyl glycoside, 0-1.0 wt% of JFC penetrant, 0.5-2.0 wt% of sodium carbonate, 0.5-2.0 wt% of sulfuric acid and the balance of water.

The preparation method of the cleaning solution comprises the following steps:

sequentially adding 3.0-6.0 wt% of coconut oil fatty acid diethanolamide, 1-5.0 wt% of alkyl glycoside, 0-1.0 wt% of JFC penetrant, 0.5-2.0 wt% of sodium carbonate and 0.5-2.0 wt% of sulfuric acid into water, and uniformly stirring to obtain the required cleaning solution.

The step of cleaning the deactivated SCR catalyst by the cleaning solution comprises the following steps:

placing the deactivated SCR catalyst sample in deionized water to be washed for 30-90 min; taking out and placing the mixture in the cleaning solution to soak and clean at normal temperature for 30-90 min, wherein ultrasonic disturbance is assisted in the cleaning process; and finally, drying the cleaned sample in an oven at 95-130 ℃ for 6-24 h, thus finishing the cleaning process.

Secondly, active substance modification loading, drying and calcining

The main components of the deactivated SCR catalyst are as follows: v₂O₅、WO₃、TiO₂. For catalysis after regeneration of the modificationThe agent achieves the purposes of effectively denitrating and removing dioxin, and the active substances modified and regenerated by the inactivated SCR catalyst used by the invention are as follows: CeO (CeO)₂、V₂O₅、Co₂O₃The load liquid prepared by the invention respectively takes cerous nitrate, vanadyl sulfate and cobalt nitrate as CeO₂、V₂O₅、Co₂O₃A precursor of the active substance.

The step of modified regeneration of the deactivated SCR catalyst comprises:

according to the weight percentage, 1.0-5.0 wt% of oxalic acid cosolvent is added into water, then 1.0-5.0 wt% of precursor cerium nitrate of active substances, 1.5-6.0 wt% of vanadyl sulfate and 0-4.0 wt% of cobalt nitrate are sequentially added, and the required negative carrier liquid can be obtained after the mixture is fully stirred for 12 hours; placing the catalyst which is subjected to the cleaning process in the step one in a negative carrier liquid, and fully soaking for 0.5-3 min; and taking out the sample, placing the sample in an oven, drying the sample for 6-24 hours at the temperature of 95-130 ℃, then placing the sample in a muffle furnace, and calcining the sample for 3-10 hours at the temperature of 400-600 ℃, so that the modification regeneration process of the deactivated SCR catalyst is completed, and the SCR catalyst product with synchronous denitration and dioxin removal functions and synchronous denitration and dioxin removal functions is obtained.

The SCR catalyst product for synchronous denitration and dioxin removal comprises the following components in percentage by weight: 1.0 to 3.5 wt% of CeO₂、0.5～5.0wt％V₂O₅、0～5.0wt％Co₂O₃、1.0～10.0wt％WO₃、77.0～90.0wt％TiO₂。

Example 1

The inactivated SCR catalyst is a waste catalyst sample of a certain 1000MW coal-fired power generating unit in China, and has the size: 150mm × 150mm × 780mm, the number of holes being: 20X 20 wells.

The method for cleaning the deactivated SCR catalyst after ash removal treatment comprises the following steps:

sequentially adding 5.0 wt% of coconut oil fatty acid diethanolamide, 2.0 wt% of alkyl glycoside, 0.1 wt% of JFC penetrant, 1.0 wt% of sodium carbonate and 1.0 wt% of sulfuric acid into deionized water, and uniformly stirring to obtain a cleaning solution; placing the deactivated catalyst sample in deionized water for washing for 60min, taking out, placing in the cleaning solution, soaking and cleaning at normal temperature for 60min, and assisting ultrasonic disturbance in the cleaning process; finally, placing the cleaned sample in an oven to be dried for 10 hours at the temperature of 110 ℃;

carrying out active substance modification loading on the cleaned sample:

firstly, adding 2.0 wt% of cosolvent oxalic acid into water, then sequentially adding 2.5 wt% of precursor cerium nitrate of an active substance and 4.0 wt% of vanadyl sulfate, and fully stirring for 12 hours to obtain the required negative carrier liquid; placing the catalyst which is subjected to the cleaning process in a negative carrier liquid, fully soaking for 3min, taking out, placing a sample in an oven for drying at 120 ℃ for 10h, then placing in a muffle furnace for calcining at 600 ℃ for 5h to obtain the SCR catalyst for synchronous denitration and dioxin removal, wherein the SCR catalyst comprises the following main components in percentage by weight: 1.5 wt% CeO₂、2.6wt％V₂O₅、4.5wt％WO₃、82.0wt％TiO₂。

Example 2

The inactivated SCR catalyst is a waste catalyst sample of a certain 300MW coal-fired power generating unit in China, and the size is as follows: 150mm × 150mm × 1000mm, the number of holes being: 18X 18 wells.

The method for cleaning the deactivated SCR catalyst after ash removal treatment comprises the following steps:

sequentially adding 3.0 wt% of coconut oil fatty acid diethanolamide, 2.0 wt% of alkyl glycoside, 0.5 wt% of JFC penetrant, 1.0 wt% of sodium carbonate and 1.0 wt% of sulfuric acid into deionized water, and uniformly stirring to obtain a cleaning solution; the deactivated catalyst sample was washed in deionized water for 60 min. Taking out, soaking and cleaning in the cleaning solution at normal temperature for 60min, and performing ultrasonic disturbance during cleaning. And (3) drying the cleaned sample block in an oven at 110 ℃ for 10 h.

Carrying out active substance modification loading on the cleaned sample:

firstly, adding 2.5 wt% of cosolvent oxalic acid into water, then sequentially adding 3.5 wt% of precursor cerium nitrate of an active substance, 2.8 wt% of vanadyl sulfate and 1.8 wt% of cobalt nitrate, and fully stirring for 12 hours to obtain the required negative carrier liquid; placing the catalyst which has been cleaned in the negative carrier liquid, fully soaking for 3min, taking out, placing the sample in a drying oven for drying for 10h at 110 ℃,then placing the catalyst in a muffle furnace to calcine for 5 hours at 600 ℃ to obtain the SCR catalyst for synchronous denitration and dioxin removal, wherein the SCR catalyst comprises the following main components in percentage by weight: 2.0 wt% CeO₂、2.2wt％V₂O₅、1.1wt％Co₂O₃、5.2wt％WO₃、79.8wt％TiO₂。

Example 3

The inactivated SCR catalyst is a waste catalyst sample of a certain 300MW coal-fired power generating unit in China, and the size is as follows: 150mm × 150mm × 950mm, the number of holes being: 21X 21 wells.

The method for cleaning the deactivated SCR catalyst after ash removal treatment comprises the following steps:

sequentially adding 1.8 wt% of coconut oil fatty acid diethanolamide, 2.5 wt% of alkyl glycoside, 0.7 wt% of JFC penetrant, 0.9 wt% of sodium carbonate and 1.3 wt% of sulfuric acid into deionized water, and uniformly stirring to obtain a cleaning solution; and (3) placing the deactivated catalyst sample in deionized water for washing for 60min, taking out, placing in the cleaning solution for soaking and cleaning at normal temperature for 70min, assisting ultrasonic disturbance in the cleaning process, and placing the cleaned sample block in an oven for drying for 12h at 100 ℃.

Carrying out active substance modification loading on the cleaned sample:

firstly, adding 3.6 wt% of cosolvent oxalic acid into water, then sequentially adding 5.0 wt% of precursor cerium nitrate of an active substance, 1.6 wt% of vanadyl sulfate and 0.9 wt% of cobalt nitrate, and fully stirring for 12 hours to obtain the required negative carrier liquid; placing the catalyst which is subjected to the cleaning process in a negative carrier liquid, fully soaking for 3min, taking out, placing a sample in an oven for drying at 110 ℃ for 10h, then placing in a muffle furnace for calcining at 600 ℃ for 5h to obtain the SCR catalyst for synchronous denitration and dioxin removal, wherein the SCR catalyst comprises the following main components in percentage by weight: 3.1 wt% CeO₂、0.6wt％V₂O₅、0.5wt％Co₂O₃、2.0wt％WO₃、81.5wt％TiO₂。

Example 4

The deactivated SCR catalyst is a waste catalyst sample of a certain 630MW coal-fired power generating unit in China, and the size is as follows: 150mm × 150mm × 1050mm, the number of holes being: 18X 18 wells.

The method for cleaning the deactivated SCR catalyst after ash removal treatment comprises the following steps:

sequentially adding 5.5 wt% of coconut oil fatty acid diethanolamide, 4.1 wt% of alkyl glycoside, 0.1 wt% of JFC penetrant, 1.8 wt% of sodium carbonate and 1.7 wt% of sulfuric acid into deionized water, and uniformly stirring to obtain a cleaning solution; placing the deactivated catalyst sample in deionized water for washing for 60 min; taking out, soaking and cleaning in the cleaning solution at normal temperature for 30min, and performing ultrasonic disturbance during cleaning. And (3) drying the cleaned sample block in an oven at 120 ℃ for 18 h.

Carrying out active substance modification loading on the cleaned sample:

firstly, adding 4.4 wt% of cosolvent oxalic acid into water, then sequentially adding 1.9 wt% of precursor cerium nitrate of active substances, 2.0 wt% of vanadyl sulfate and 4.0 wt% of cobalt nitrate, and fully stirring for 12h to obtain the required negative carrier liquid. Placing the catalyst which is subjected to the cleaning process in a negative carrier liquid, fully soaking for 3min, taking out, placing a sample in an oven for drying for 12h at 110 ℃, then placing in a muffle furnace for calcining for 4h at 500 ℃ to obtain the SCR catalyst for synchronous denitration and dioxin removal, wherein the SCR catalyst comprises the following main components in percentage by weight: 1.2 wt% CeO₂、1.6wt％V₂O₅、3.2wt％Co₂O₃、7.4wt％WO₃、83.2wt％TiO₂。

The sample was tested using an X-ray fluorescence spectrometer. The main components of the deactivated SCR catalyst samples and the modified regenerated SCR catalyst samples for simultaneous denitration and dioxin removal in examples 1 to 4 are shown in table 1.

TABLE 1

As shown in Table 1, the modification regeneration method of the present invention can effectively remove impurities such as Si and Al on the surface of the deactivated SCR catalyst, and at the same time, CeO₂、V₂O₅、Co₂O₃The active substance is effectively loaded.

Example 5

And (4) performing performance evaluation on the modified and regenerated SCR catalyst sample for synchronous denitration and dioxin removal.

And (3) respectively crushing and grinding the products obtained in the embodiments 1-4, sieving the products with a 40-60-mesh sieve, taking 2ml of the obtained granular samples to prepare granular samples, and then carrying out denitration and dioxin removal performance tests on a fixed bed reactor.

The simulation smoke of the waste incineration consists of 500ppm NO and 500ppm NH₃、30ppm SO₂、7％O₂、10％H₂O、3.0ng-TEQ/m³Dioxins and equilibrium N₂The flow is controlled by a mass flowmeter. The components of the flue gas enter a fixed bed reactor through a mixer, and the fixed bed reactor is made of a quartz tube with the diameter of 8 mm. And (3) placing a test sample in a constant-temperature section of the fixed bed reactor, testing the temperature of flue gas to be 260 ℃, and discharging the flue gas at the outlet of the fixed bed reactor after the flue gas is treated by an activated carbon tail gas treatment system.

And (3) calculating the dioxin removal efficiency of the sample according to the formula (1).

E＝(C_in-C_out)/C_in×100 (1)

In the formula: e is the dioxin removal efficiency of the sample; c_inThe concentration of dioxin in the flue gas at the inlet of the fixed bed reactor; c_outIs the concentration of dioxin in the flue gas at the outlet of the fixed bed reactor.

The concentration of NO in the flue gas is tested at the inlet and the outlet of the fixed bed reactor, and the denitration efficiency of the sample is calculated by the formula (2):

η＝(NO_in-NO_out)/NO_in×100 (2)

in the formula: eta is the denitration efficiency of the sample; NO_inIs the concentration of the flue gas NO at the inlet of the fixed bed reactor; NO_outIs the concentration of the NO in the flue gas at the outlet of the fixed bed reactor.

The samples of the deactivated SCR catalyst and the modified regenerated SCR catalyst for simultaneous denitration and dioxin removal in examples 1 to 4 were subjected to a denitration and dioxin removal performance test, and the results are shown in table 2.

TABLE 2

As can be seen from table 2, the modification regeneration method of the present invention can effectively improve the denitration and dioxin removal efficiency of the modified and regenerated deactivated SCR catalyst, and solve the problem of efficient and synchronous removal of NOx and dioxin from the waste incineration flue gas while performing resource recycling, and can prepare a synchronous denitration and dioxin removal catalyst suitable for the waste incineration flue gas, thereby greatly reducing the waste incineration flue gas treatment cost₂O₅、WO₃、TiO₂The existing resources are effectively utilized, the environmental protection benefit is remarkable, and the prepared catalyst has high denitration and dioxin removal performance and wide application prospect.

The parts of the invention not specifically described can be realized by adopting the prior art, and the details are not described herein.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.