CN110756024B - Flue gas denitration composition and flue gas treatment method - Google Patents
Flue gas denitration composition and flue gas treatment method Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention relates to the technical field of gas separation and purification, and discloses a flue gas denitration composition and a flue gas treatment method. The flue gas denitration composition comprises a main absorbent, an activator, an antioxidant, an acidity regulator and water, wherein the weight of the water is 1000 parts, the weight of the main absorbent is 20-40 parts, the weight of the activator is 0.5-5 parts, and the weight of the antioxidant is 0.05-0.5 part; the weight portion of the acidity regulator is based on regulating the acidity of the flue gas denitration composition to 5-8. The flue gas denitration composition has the advantages of oxidation resistance, stability, low corrosivity, regeneration, cyclic utilization and the like; the flue gas denitration composition has good complexing removal capability on NO in flue gas, and has higher removal efficiency on nitrogen oxides and sulfur dioxide in the flue gas; and after the flue gas denitration composition is regenerated, the flue gas denitration composition still keeps higher removal efficiency on nitrogen oxides and sulfur dioxide in the flue gas.
Description
Technical Field
The invention relates to a gas separation and purification technology, in particular to a flue gas denitration composition and a flue gas treatment method.
Background
A series of new emission standards of the steel industry, such as the emission standard of atmospheric pollutants for the steel sintering and pelletizing industry (GB28662-2012) are officially implemented from 10/1/2012, and the latest emission standard is implemented from 1/2015, and the special emission limit values of the sintering process are that the particles are less than 50mg/Nm3 and SO2Less than 200mg/Nm3、NOxLess than 300mg/Nm3。
In 2018, in 5 months, the ministry of ecological environment of China issued "ultra-low emission improvement working scheme (survey draft) of iron and steel enterprises" explicitly stipulates that the flue gas of a sintering machine head and the flue gas of pellet roasting have the reference oxygen contentAt 16% condition, particulate matter, SO2、NOxThe discharge concentration is not higher than 10, 35 and 50mg/Nm3. In conclusion, advanced treatment of pollutants in flue gas provides new requirements for flue gas treatment technology, and the state of 4 months in 2019 issues 'opinions on promoting implementation of ultralow emission of steel industry' (environment [2019 ]]35), it is clearly indicated that in 2025, the iron and steel enterprises basically completed the ultra-low emission transformation.
At present, only activated coke (charcoal), an ozone oxidation and circulating fluidized bed absorption method, an FOSS-D technology, a limestone wet desulphurization and medium-low temperature SCR denitration technology, and a limestone semi-dry desulphurization and medium-low temperature SCR denitration technology are used for ultralow treatment of low-sulfur sintering flue gas in China, and are applied to high-sulfur sintering flue gas temporary non-desulphurization and denitration engineering. However, the active carbon can realize NO in high-sulfur smoke and smokexThe ultra-low emission needs to be provided with a secondary adsorption tower, the problems of serious acid-making wastewater and active carbon loss exist simultaneously, the ozone oxidation technology has the defects of ozone escape, difficulty in utilizing desulfurized ash and the like, the limestone wet desulphurization and SCR denitration technology has the defects of white smoke phenomenon, desulfurized wastewater treatment, high system energy consumption, high operation cost and the like, and the problems of difficulty in utilizing desulfurized ash and high denitration cost exist in limestone semi-dry desulphurization and SCR denitration.
The wet-process simultaneous desulfurization and denitrification has the advantages of simple process, low equipment investment and the like, and has more advantages for high-sulfur sintering flue gas, coal-fired flue gas and smelting flue gas. The complex absorption method is a low-temperature wet denitration technology which is considered by scholars to be expected to realize industrial application, and the core of the technology is selection of a flue gas denitration agent.
Disclosure of Invention
The invention aims to solve the problems of low denitration efficiency, high cost and high consumption of a denitration agent in the low-temperature denitration catalysis process in the prior art, and provides a flue gas denitration composition and a flue gas treatment method, wherein the flue gas denitration composition has good complexing removal capability on NO in flue gas, has high removal efficiency on nitrogen oxides in the flue gas, and has the advantages of oxidation resistance, stability, low corrosivity, regeneration, cyclic utilization and the like; meanwhile, the method provided by the invention is based on wet desulphurization, and adopts a low-temperature wet denitration technology, so that the defects of flue gas temperature change and the like between desulphurization and denitration processes are overcome, the energy consumption of the system is greatly reduced, and no secondary pollutant is generated.
In order to achieve the above object, according to one aspect of the present invention, there is provided a flue gas denitration composition comprising a main absorbent, an activator, an antioxidant, an acidity regulator, and water, wherein the main absorbent is 20 to 40 parts by weight, the activator is 0.5 to 5 parts by weight, and the antioxidant is 0.05 to 0.5 part by weight, based on 1000 parts by weight of water; the weight portion of the acidity regulator is based on regulating the acidity of the flue gas denitration composition to 5-8.
Preferably, the primary absorbent is a mixture of a divalent cobalt salt and N, N-bis (2-hydroxyethyl) glycine.
Preferably, the divalent cobalt salt is cobalt sulfate or cobalt nitrate.
Preferably, the weight ratio of the divalent cobalt salt to the N, N-bis (2-hydroxyethyl) glycine is 1:1 to 1.5.
Preferably, the activator is one or more of tetraethylenepentamine, hydroxyethylethylenediamine, diethylenetriamine, triethylenetetramine and triethylenediamine.
Preferably, the antioxidant is alkylphenol ethoxylates.
Preferably, the acidity regulator is an acid solution or an alkali solution.
Preferably, the acid solution is one or more of sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid or citric acid.
Preferably, the alkali solution is a sodium hydroxide solution.
In another aspect, the present invention provides a method for treating flue gas, comprising: contacting flue gas with a flue gas denitration composition, wherein the flue gas denitration composition is the flue gas denitration composition described above.
Preferably, the contacting means is countercurrent contacting.
Preferably, the temperature of the flue gas denitration composition is 20-80 ℃ in the process of contacting the flue gas with the flue gas denitration composition; the liquid-gas ratio of the flue gas denitration composition to the flue gas is 0.05-5.0kg/Nm3。
Preferably, the method further comprises preparing a flue gas denitration composition according to the following process: the main absorbent, the activator, the antioxidant and water are mixed into a solution, and then the acidity of the solution is adjusted by the acidity regulator.
Preferably, the method further comprises regenerating the flue gas denitration composition after contacting with the flue gas, and recycling the regenerated flue gas denitration composition for the flue gas treatment process.
Preferably, the regeneration process comprises adding urea and zinc powder or iron powder into the flue gas denitration composition after being contacted with the flue gas.
Preferably, the weight ratio of the flue gas denitration composition contacted with the flue gas to the sum of the weight of the urea and the zinc powder or the iron powder is 1000: 5-12.
Preferably, the weight ratio of the urea to the zinc powder or the iron powder is 1: 0.2-1.
Preferably, the regeneration conditions include: the temperature is 70-90 ℃; the time is 20-40 min.
In the invention, the flue gas denitration composition prepared by combining the main absorbent, the activating agent, the antioxidant and the water in a specific ratio has the advantages of oxidation resistance, stability, low corrosivity, regeneration and cyclic utilization and the like; the flue gas denitration composition has good complexing and removing capability on NO in flue gas, has high removing efficiency on nitrogen oxides in the flue gas, and also has good removing efficiency on sulfur dioxide in the flue gas; after the flue gas denitration composition is regenerated, the flue gas denitration composition still keeps higher removal efficiency on nitrogen oxides and sulfur dioxide in flue gas; meanwhile, the method provided by the invention is based on wet desulphurization, and adopts a low-temperature wet denitration technology, so that the defects of flue gas temperature change and the like between desulphurization and denitration processes are overcome, the energy consumption of the system is greatly reduced, and no secondary pollutant is generated.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a flue gas denitration composition, which comprises a main absorbent, an activator, an antioxidant, an acidity regulator and water, wherein the weight of the water is 1000 parts, the weight of the main absorbent is 20-40 parts, the weight of the activator is 0.5-5 parts, and the weight of the antioxidant is 0.05-0.5 part; the weight portion of the acidity regulator is based on regulating the acidity of the flue gas denitration composition to 5-8.
In a preferred embodiment, the primary absorbent is 25 to 35 parts by weight, the activator is 0.5 to 5 parts by weight, and the antioxidant is 1 to 5 parts by weight, based on 1000 parts by weight of water.
In a preferred embodiment, the weight part of the acidity regulator is based on regulating the acidity of the flue gas denitration composition to 5 to 7. In a more preferred embodiment, the weight part of the acidity regulator is based on regulating the acidity of the flue gas denitration composition to 5 to 6.5.
In the flue gas denitration composition, the main absorbent is a mixture of divalent cobalt salt and N, N-bis (2-hydroxyethyl) glycine. The divalent cobalt salt may be selected conventionally in the art, and preferably, the divalent cobalt salt is cobalt sulfate or cobalt nitrate.
The weight ratio of the divalent cobalt salt to the N, N-bis (2-hydroxyethyl) glycine is 1: 1-1.5; specifically, the weight ratio of the divalent cobalt salt to N, N-bis (2-hydroxyethyl) glycine may be 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, or 1: 1.5; preferably, the weight ratio of the divalent cobalt salt to the N, N-bis (2-hydroxyethyl) glycine is 1:1.
In the flue gas denitration composition of the present invention, the activating agent may be a conventional one in the art, and preferably, the activating agent is one or more of tetraethylenepentamine, hydroxyethylethylenediamine, diethylenetriamine, triethylenetetramine and triethylenediamine; more preferably, the activator is tetraethylenepentamine or triethylenetetramine.
In the flue gas denitration composition, the antioxidant can effectively reduce the degradation or oxidation of the flue gas denitration composition in the flue gas treatment process, and especially can effectively reduce the degradation or oxidation of the main absorbent in the flue gas treatment process. The antioxidant may be selected as is conventional in the art, and preferably, the antioxidant is alkylphenol ethoxylates.
In the flue gas denitration composition of the present invention, the acidity regulator is used to regulate the acidity of the flue gas denitration composition. The acidity regulator can be an acid solution or an alkali solution which is conventionally used in the field, and preferably, the acid solution is one or more of sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid or citric acid; preferably, the alkali solution is a sodium hydroxide solution.
In another aspect, the present invention provides a method for treating flue gas, comprising: contacting flue gas with a flue gas denitration composition, wherein the flue gas denitration composition is the flue gas denitration composition described above.
The flue gas can be sintering flue gas, smelting flue gas, circular collecting flue gas or coal-fired flue gas and other industrial tail gases.
In the flue gas treatment method of the present invention, the contact manner is not particularly required, as long as the flue gas can be sufficiently contacted with the flue gas denitration composition. In order to increase the contact area of the flue gas with the flue gas denitration composition, the contact mode is preferably countercurrent contact.
In the flue gas treatment method, in the process of contacting flue gas with the flue gas denitration composition, the temperature of the flue gas denitration composition is 20-80 ℃, and the liquid-gas ratio of the flue gas denitration composition to the flue gas is 0.05-5.0kg/Nm3(ii) a Preferably, in the process of contacting the flue gas and the flue gas denitration composition, the temperature of the flue gas denitration composition is 25-60 ℃, and the liquid-gas ratio of the flue gas denitration composition to the flue gas is 0.05-2.5kg/Nm3(ii) a More preferably, in the process of contacting the flue gas and the flue gas denitration composition, the temperature of the flue gas denitration composition is 30-50 ℃, and the liquid-gas ratio of the flue gas denitration composition to the flue gas is 0.08-1.5kg/Nm3。
In the flue gas treatment method of the present invention, the method further comprises preparing a flue gas denitration composition according to the following process: the main absorbent, the activator, the antioxidant and water are mixed into a solution, and then the acidity of the solution is adjusted by the acidity regulator.
In the preparation process of the flue gas denitration composition, the flue gas denitration composition prepared by the main absorbent, the activating agent, the antioxidant and the water according to the specific proportion has good complexing and removing capability on NO in flue gas, and the flue gas denitration composition has the advantages of strong oxidation resistance, stability and low corrosivity, and can be regenerated and recycled.
The flue gas denitration composition prepared by the invention can remove nitrogen oxide in flue gas and SO in the flue gas2And the like.
In the flue gas treatment method, the method also comprises the steps of regenerating the flue gas denitration composition contacted with the flue gas, and recycling the regenerated flue gas denitration composition for the flue gas treatment process.
Preferably, the regeneration process comprises adding urea and zinc powder or iron powder into the flue gas denitration composition after being contacted with the flue gas.
In the regeneration process, the weight ratio of the flue gas denitration composition contacted with the flue gas to the sum of the weight of urea and zinc powder or iron powder is 1000: 5-12; specifically, the weight ratio of the flue gas denitration composition contacted with the flue gas to the sum of the weight of urea and zinc powder or iron powder can be 1000:5, 1000:6, 1000:7, 1000:8, 1000:9, 1000:10, 1000:11 or 1000: 12; preferably, the weight ratio of the flue gas denitration composition contacted with the flue gas to the sum of the weight of the urea and the zinc powder or the iron powder is 1000: 7.
In the regeneration process, the weight ratio of urea to zinc powder or iron powder is 1: 0.2-1; specifically, the weight ratio of urea to zinc powder or iron powder may be 1:0.2, 1:0.4, 1:0.6, 1:0.8 or 1: 1; preferably, the weight ratio of urea to zinc powder or iron powder is 1:1.
In the regeneration process, the regeneration temperature is 70-90 ℃; specifically, the regeneration temperature may be 70 ℃, 75 ℃, 80 ℃, 85 ℃ or 90 ℃; preferably, the regeneration temperature is 80 ℃.
In the regeneration process, the regeneration time is 20-40 min; specifically, the regeneration time may be 20min, 25min, 30min, 35min, or 40 min; preferably, the regeneration time is 30 min.
In the regeneration process, sodium ions and sulfate radicals in the flue gas denitration composition after being contacted with the flue gas can be removed by adopting a freezing crystallization method.
In the invention, the flue gas denitration composition prepared by the main absorbent, the activating agent, the antioxidant and the water according to a specific proportion has good complexing removal capability on NO in flue gas, has high removal efficiency on nitrogen oxide and sulfur dioxide in the flue gas, and has the advantages of oxidation resistance, stability, low corrosivity, regeneration, cyclic utilization and the like; meanwhile, the method provided by the invention is based on wet desulphurization, and adopts a low-temperature wet denitration technology, so that the defects of flue gas temperature change and the like between desulphurization and denitration processes are overcome, the energy consumption of the system is greatly reduced, and no secondary pollutant is generated.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
Example 1
The gas composition of the inlet flue gas in example 1 comprises NOx、CO2、O2、CO、SO2、N2In which NO isxIs 600mg/m3、SO2Is 40mg/m3In which NOxIs NO, NO290% of NO.
S1 preparation of flue gas denitration composition
Mixing 15 parts by weight of cobalt nitrate, 20 parts by weight of N, N-bis (2-hydroxyethyl) glycine, 5 parts by weight of tetraethylenepentamine, 2 parts by weight of alkylphenol polyoxyethylene and 1000 parts by weight of water to form a solution, and then adjusting the acidity of the solution to 6.5 by using sulfuric acid to obtain a flue gas denitration composition;
s2 flue gas treatment process
Heating the flue gas denitration composition prepared in the step S1 to 45 ℃, feeding the flue gas denitration composition into a packed tower provided with a glass net ring from the upper end of the packed tower by using a micro vacuum pump, introducing inlet flue gas into a flue gas pipe from the bottom end of the packed tower, wherein the inlet flue gas is in reverse contact with the flue gas denitration composition sprayed from the upper end, and the liquid-gas ratio of the flue gas denitration composition to the inlet flue gas is 0.3kg/Nm3And the purified outlet flue gas is discharged from the top of the absorption tower, and the flue gas denitration composition contacted with the inlet flue gas enters a denitration pregnant solution tank. Detection of NO in the Exit Smoke with enhanced Smoke Analyzer (Germany, model: Vario Plus)xAnd SO2In the content of NO in the outlet flue gasxIs 66mg/m3，SO2Is 9mg/m3；
S3 regeneration of denitration composition after contact with inlet flue gas
Adding 4 parts by weight of urea and 4 parts by weight of zinc powder into 1000 parts by weight of the denitration composition contacted with the inlet flue gas, and regenerating for 20min at 80 ℃;
s4, carrying out the steps S1 and S2 on the flue gas denitration composition after regenerationTreating the smoke to detect NO in the smokexIs 69mg/m3，SO2Is 13mg/m3。
Example 2
The gas composition of the inlet flue gas in example 1 comprises NOx、CO2、O2、CO、SO2、N2In which NO isxIs 450mg/m3、SO2Is 52mg/m3In which NOxIs NO, NO290% of NO.
S1 preparation of flue gas denitration composition
Mixing 12 parts by weight of cobalt sulfate, 18 parts by weight of N, N-bis (2-hydroxyethyl) glycine, 5 parts by weight of triethylene tetramine, 2 parts by weight of alkylphenol polyoxyethylene and 1000 parts by weight of water to form a solution, and then adjusting the acidity of the solution to 6 by using hydrochloric acid to obtain a flue gas denitration composition;
s2 flue gas treatment process
Heating the flue gas denitration composition prepared in the step S1 to 50 ℃, feeding the flue gas denitration composition into a packed tower provided with a glass net ring from the upper end of the packed tower by using a micro vacuum pump, introducing inlet flue gas into a flue gas pipe from the bottom end of the packed tower, wherein the inlet flue gas is in reverse contact with the flue gas denitration composition sprayed from the upper end, and the liquid-gas ratio of the flue gas denitration composition to the inlet flue gas is 1kg/Nm3And the purified outlet flue gas is discharged from the top of the absorption tower, and the flue gas denitration composition contacted with the inlet flue gas enters a denitration pregnant solution tank. Detection of NO in the Exit Smoke with enhanced Smoke Analyzer (Germany, model: Vario Plus)xAnd SO2In the content of NO in the outlet flue gasxIs 48mg/m3，SO2Is 8mg/m3；
S3 regeneration of denitration composition after contact with inlet flue gas
Adding 4 parts by weight of urea and 4 parts by weight of iron powder into 1000 parts by weight of the denitration composition contacted with the inlet flue gas, and regenerating for 30min at 90 ℃;
s4, adopting the regenerated flue gas denitration composition to carry out the treatment according to the methods of the steps S1 and S2The inlet flue gas in the embodiment is treated, and NO in the outlet flue gas is detectedxIs 55mg/m3，SO2Is 10mg/m3。
Example 3
The procedure was followed as in example 1, except that the acidity of the solution was adjusted to 8 with sodium hydroxide solution in step S1, and as a result, NO in the outlet flue gas was detected in step S2xIs 69mg/m3，SO2Is 10mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedxIs 72mg/m3，SO2Is 11mg/m3。
Example 4
The procedure of example 1 was repeated, except that the liquid-gas ratio in step S2 was 3kg/Nm3As a result, NO in the outlet flue gas is detected in step S2xIs 70mg/m3，SO2Is 11mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedxIs 73mg/m3，SO2Is 12mg/m3。
Comparative example 1
The procedure was as in example 1 except that cobalt nitrate and bicine were not added in step S1, and NO in the outlet flue gas was detected in step S2x266mg/m3，SO2Is 26mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedxIs 289mg/m3，SO2Is 28mg/m3。
Comparative example 2
The procedure was followed as in example 1 except that tetraethylenepentamine was not added in step S1, and as a result, NO in the outlet flue gas was detected in step S2xIs 165mg/m3，SO2Is 18mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedxIs 181mg/m3，SO2Is 19mg/m3。
Comparative example 3
The procedure was as in example 1, except that in step S1, no alkane was addedPolyoxyethylene alkylphenol ether, as a result, NO in the outlet flue gas is detected in step S2xIs 236mg/m3，SO2Is 23mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedxIs 248mg/m3，SO2Is 24mg/m3。
Comparative example 4
The procedure of example 1 was followed except that the acidity of the solution was not adjusted in step S1, and as a result, NO in the outlet flue gas was detected in step S2xIs 241mg/m3，SO2Is 22mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedx259mg/m3，SO2Is 23mg/m3。
Comparative example 5
The procedure of example 1 was followed, except that 8 parts by weight of cobalt sulfate and 7 parts by weight of bicine were added in step S1, and as a result, NO in the outlet flue gas was detected in step S2xIs 124mg/m3，SO2Is 16mg/m3(ii) a In step S4, NO in the outlet flue gas is detectedxIs 131mg/m3，SO2Is 18mg/m3。
As can be seen from the results of examples 1 to 4 and comparative examples 1 to 5, the flue gas denitration composition prepared according to the method of the present invention can be used for the treatment of NO in flue gasxHas higher removal rate and can simultaneously remove SO in the flue gas2Also has better removal rate. Meanwhile, after the regeneration process is adopted to regenerate the flue gas denitration composition contacted with the inlet flue gas, the regenerated flue gas denitration composition is used for treating NO in the flue gasxAnd SO2Still maintain higher removal rate.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (14)
1. The flue gas denitration composition is characterized by comprising 20-40 parts by weight of main absorbent, 0.5-5 parts by weight of activator and 0.05-0.5 part by weight of antioxidant in terms of 1000 parts by weight of water; the weight part of the acidity regulator is based on regulating the acidity of the flue gas denitration composition to 5-8;
the main absorbent is a mixture of divalent cobalt salt and N, N-bis (2-hydroxyethyl) glycine, and the weight ratio of the divalent cobalt salt to the N, N-bis (2-hydroxyethyl) glycine is 1: 1-1.5;
the antioxidant is alkylphenol ethoxylates;
the activating agent is one or more of tetraethylenepentamine, hydroxyethyl ethylenediamine, diethylenetriamine, triethylene tetramine and triethylene diamine.
2. The flue gas denitration composition of claim 1, wherein the divalent cobalt salt is cobalt sulfate or cobalt nitrate.
3. The flue gas denitration composition of claim 1, wherein the acidity regulator is an acid solution or an alkali solution.
4. The flue gas denitration composition of claim 3, wherein the acid solution is one or more of sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid or citric acid.
5. The flue gas denitration composition of claim 3, wherein the alkali solution is a sodium hydroxide solution.
6. A method of flue gas treatment, the method comprising: contacting a flue gas with a flue gas denitration composition, wherein the flue gas denitration composition is the flue gas denitration composition of any one of claims 1 to 5.
7. The process of claim 6, wherein the contacting is counter current.
8. The method according to claim 6 or 7, wherein the temperature of the flue gas denitration composition during the contacting of the flue gas with the flue gas denitration composition is 20-80 ℃; the liquid-gas ratio of the flue gas denitration composition to the flue gas is 0.05-5.0kg/Nm3。
9. The method of claim 6, further comprising preparing a flue gas denitration composition according to the following process: the main absorbent, the activator, the antioxidant and water are mixed into a solution, and then the acidity of the solution is adjusted by the acidity regulator.
10. The method of claim 6, further comprising regenerating the flue gas denitration composition after contacting the flue gas, and recycling the regenerated flue gas denitration composition for use in the flue gas treatment process.
11. The method of claim 10, wherein the regeneration comprises adding urea and zinc dust or iron dust to the flue gas denitration composition after contacting the flue gas.
12. The method of claim 11, wherein the weight ratio of the flue gas denitration composition after contacting with the flue gas to the sum of the weight of urea and zinc powder or iron powder is 1000: 5-12.
13. The method of claim 11, wherein the weight ratio of urea to zinc powder or iron powder is 1: 0.2-1.
14. The method of claim 11, wherein the regeneration conditions comprise: the temperature is 70-90 ℃; the time is 20-40 min.
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