Integrated flue gas treatment material for waste incineration power plant and preparation method thereof

Abstract

The present invention relates to the technical field of flue gas purification, and particularly relates to a material for integrated treatment of flue gas from a waste incineration power plant and a preparation method thereof. The preparation method of the material for integrated treatment of flue gas from a waste incineration power plant includes the following steps: Step (1) preparing MgO-MnO2 core-shell powder; Step (2) preparing MgO-MnO2-ZnO core-shell powder; Step (3) adding an alkali-modified molecular sieve carrier, MgO-MnO2-ZnO core-shell powder and a binder into deionized water, stirring until dry, calcining, grinding and sieving to obtain the material for integrated treatment of flue gas from a waste incineration power plant. The present invention uses MgO@MnO2@ZnO as the active component and an alkali-modified molecular sieve as the carrier. Its characteristic lies in that the micro-particle structure of the active component adopts a multi-layer core-shell structure design, and the synergistic cooperation realizes the synergistic treatment of SO2, NOx and HCl, and is particularly suitable for the integrated treatment of flue gas from a waste incineration power plant.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas purification, and specifically relates to an integrated flue gas treatment material for a waste incineration power plant and a preparation method thereof. Background Art

[0002] In order to improve the living environment and quality of life of the people, it is necessary to professionally treat the flue gas of complex waste incineration power plants. There are many pollutants in the flue gas, such as sulfur dioxide and nitrogen oxides. The desulfurization technology of waste incineration power plants is mainly rotary spray semi-dry desulfurization, and the denitrification technology is SNCR technology. However, the denitrification efficiency of SNCR technology is low, and NH 3 The escape phenomenon is serious. 3 -SCR technology has high denitrification efficiency, but the acidic gases in the flue gas of waste incineration power plants will cause the catalyst to deactivate quickly. In addition, SO 2 、NO x The single treatment of pollutant gases such as HCl is costly and requires a large battlefield space. It is urgent to develop new technologies for flue gas treatment in waste incineration power plants. The existing technologies mostly use a single treatment method that is difficult to effectively control most pollutants. Therefore, materials that can perform integrated treatment of flue gas are needed to effectively control and reduce the emission of various pollutants to achieve better treatment effects. Summary of the invention

[0003] The purpose of the present invention is to provide an integrated flue gas treatment material for a waste incineration power plant and a preparation method thereof, so as to solve the technical problem that the single treatment effect is poor in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a method for preparing an integrated flue gas treatment material for a waste incineration power plant, comprising the following steps:

[0006] Step (1) glycerol and isopropanol are mixed, stirred, MgO microspheres are added, ultrasonic treatment is performed, and then a manganese salt solution is added. After continued stirring, the mixture is transferred to a reactor, subjected to hydrothermal reaction, filtered, washed, dried, calcined, ground and sieved to obtain MgO-MnO 2 Core-shell powder;

[0007] Step (2) Mix glycerol and isopropanol, stir, and then add MgO-MnO 2 The core-shell powder was ultrasonically treated, and zinc salt and pore-forming agent were added. After continuous stirring, the powder was transferred to a reactor, subjected to hydrothermal reaction, filtered, washed, dried, calcined, ground and sieved to obtain MgO-MnO 2 -ZnO core-shell powder;

[0008] Step (3) alkaline modified molecular sieve carrier, MgO-MnO 2 -ZnO core-shell powder and a binder are added into deionized water, stirred until dry, calcined, ground and sieved to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0009] Preferably, in the step (1), the mass ratio of glycerol, isopropanol, MgO microspheres and manganese salt solution is 1:(4-8):(0.5-3.6):(0.34-9.51); the stirring treatment time is 10-15 min; the ultrasonic treatment time is 1-2 h; the manganese salt solution includes one of 50wt% manganese nitrate solution and 50wt% manganese acetate solution; the stirring treatment time is continued for 0.5-1 h; the hydrothermal reaction conditions are: the hydrothermal reaction temperature is 160-210° C., and the hydrothermal reaction time is 8-12 h; the washing method is: the filter residue is washed 3-5 times with deionized water and anhydrous ethanol; the drying conditions are: the drying temperature is 60-80° C., and the drying time is 6-12 h; the calcination conditions are: the calcination temperature is 400-500° C., and the calcination time is 2-4 h; the mesh number of the ground and sieved is 800-900 mesh.

[0010] Preferably, in step (2), glycerol, isopropanol, MgO-MnO 2 The mass ratio of core-shell powder, zinc salt and pore-forming agent is 1:(4-8):(0.5-3.6):(0.17-12.4):(0.017-2.48); the stirring treatment time is 10-15min; the ultrasonic treatment time is 1-2h; the continuous stirring time is 0.5-1h; the hydrothermal reaction conditions: the hydrothermal reaction temperature is 160-210℃, and the hydrothermal reaction time is 8-12h; the washing method: the filter residue is washed 3-5 times with deionized water and anhydrous ethanol; the drying conditions: the drying temperature is 60-80℃, and the drying time is 6-12h; the calcination conditions: the calcination temperature is 400-500℃, and the calcination time is 2-4h; the zinc salt is zinc acetate; the pore-forming agent is monohydrated citric acid; the mesh number of the ground and sieved is 800-900 mesh.

[0011] Preferably, in step (3), the base-modified molecular sieve carrier, MgO-MnO 2 -The mass ratio of ZnO core-shell powder, binder and deionized water is 1:(0.05-0.25):(0.01-0.05):(10-20); the stirring temperature is 60-80°C; the calcination conditions are: the calcination temperature is 400-500°C, and the calcination time is 2-4h; the binder includes at least one of kaolin and montmorillonite; the mesh number of the ground and sieved is 100-300 mesh.

[0012] Preferably, the method for preparing the MgO microspheres comprises the following steps:

[0013] Deionized water and anhydrous ethanol are mixed, stirred, and then magnesium salt and ethylenediaminetetraacetic acid are added. After continued stirring, the mixture is transferred to a reactor, subjected to hydrothermal reaction, filtered, washed, dried, calcined, ground and sieved to obtain MgO microspheres.

[0014] Preferably, the mass ratio of deionized water, anhydrous ethanol, magnesium salt and ethylenediaminetetraacetic acid is 1:(0.2-0.8):(0.12-0.72):(0.096-0.864); the stirring treatment time is 5-10min; the stirring treatment time is continued for 1-2h; the hydrothermal reaction conditions: the hydrothermal reaction temperature is 160-210°C, and the hydrothermal reaction time is 8-12h; the washing method: the filter residue is washed 3-5 times with deionized water and anhydrous ethanol; the drying conditions: the drying temperature is 60-80°C, and the drying time is 6-12h; the calcination conditions: the calcination temperature is 400-500°C, and the calcination time is 2-4h; the magnesium salt is magnesium nitrate; and the mesh number of the ground and sieved is 800-900 mesh.

[0015] Preferably, the method for preparing the base-modified molecular sieve carrier comprises the following steps:

[0016] The molecular sieve is added into the organic alkali solution, stirred, filtered, washed, dried, calcined, ground and sieved to obtain the alkali-modified molecular sieve carrier.

[0017] Preferably, the mass ratio of the molecular sieve and the organic alkali solution is (0.1-0.5):1; stirring treatment conditions: stirring treatment time is 0.5-1h, stirring treatment temperature is 40-60°C; washing method: the filter residue is washed with deionized water 3-5 times; drying conditions: drying temperature is 60-80°C, drying time is 6-12h; calcination conditions: calcination temperature is 400-500°C, calcination time is 2-4h; the organic alkali solution is a 25wt% tetrabutylammonium hydroxide aqueous solution; the molecular sieve includes one of USY type molecular sieve, ZSM-5 type molecular sieve, and BETA type molecular sieve; the mesh number of the ground and sieved is 100-300 mesh.

[0018] The integrated flue gas treatment material for a waste incineration power plant is prepared by the method for preparing the integrated flue gas treatment material for a waste incineration power plant.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] In the present invention, MgO-MnO 2-ZnO is used as the active component, and alkali-modified molecular sieve is used as the carrier to prepare the integrated flue gas treatment catalyst material for waste incineration power plants. The microscopic particle structure of the active component adopts a multi-layer core-shell structure design, with porous zinc oxide (ZnO) as the outermost layer, which can not only adsorb and capture acidic gases, but also prevent acidic gases from corroding the denitrification active sites inside the material and causing catalyst poisoning; manganese dioxide (MnO) with excellent redox performance is used as the transition metal oxide 2 ) is the middle layer, which can catalyze the oxidation of NO into more active NO 2 and higher valence states, greatly improving the capture performance of alkaline substances on nitrogen oxides; using magnesium oxide (MgO) microspheres as the core, the oxidized nitrogen oxides are adsorbed and captured, thereby achieving the simultaneous purification of multiple pollutants. At the same time, the alkali-modified molecular sieve not only has a larger specific surface area, but also has a stronger adsorption capacity for acidic gases. The catalyst prepared by the active component and the alkali-modified molecular sieve can achieve SO 2 、NO x , HCl, and is particularly suitable for the integrated treatment of flue gas in waste incineration power plants; the material removes NO at 100-250°C x Efficiency>90%, SO removal 2 The efficiency is greater than 99%, and the HCl removal efficiency is greater than 99%. The catalyst components are environmentally friendly, low in cost, and will not cause secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a process flow chart of the preparation of the integrated flue gas treatment material for waste incineration power plants of the present invention;

[0023] Figure 2 This is a SEM picture of the integrated flue gas treatment material for a waste incineration power plant of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment discloses a method for preparing MgO microspheres, comprising the following steps:

[0027] 200 g of deionized water and 100 g of anhydrous ethanol were mixed, stirred for 8 minutes, and then 84 g of magnesium nitrate and 96 g of ethylenediaminetetraacetic acid were added. After stirring for 1.5 hours, the mixture was transferred to a reactor and subjected to a hydrothermal reaction at 185°C for 10 hours. The mixture was filtered and the residue was washed with deionized water and anhydrous ethanol for 4 times, dried at 70°C for 9 hours, and then calcined at 450°C for 3 hours. The mixture was ground through a 850-mesh sieve to obtain MgO microspheres.

[0028] Example 2

[0029] This embodiment discloses a method for preparing a base-modified molecular sieve carrier, comprising the following steps:

[0030] 30 g of USY molecular sieve was added to 100 g of organic base solution, stirred at 50°C for 0.75 h, and then filtered and separated. The filter residue was washed with deionized water 4 times, dried at 70°C for 9 h, and then calcined at 450°C for 3 h. The residue was ground through a 200-mesh sieve to obtain an alkali-modified molecular sieve carrier.

[0031] The organic alkali solution is a 25wt% tetrabutylammonium hydroxide aqueous solution.

[0032] Example 3

[0033] This embodiment discloses a method for preparing a base-modified molecular sieve carrier, comprising the following steps:

[0034] 30 g of ZSM-5 molecular sieve was added to 100 g of organic base solution, stirred at 50°C for 0.75 h, and then filtered and separated. The filter residue was washed with deionized water 4 times, dried at 70°C for 9 h, and then calcined at 450°C for 3 h, and ground through a 100-mesh sieve to obtain an alkali-modified molecular sieve carrier.

[0035] Example 4

[0036] This embodiment discloses a method for preparing a base-modified molecular sieve carrier, comprising the following steps:

[0037] 30 g of BETA molecular sieve was added to 100 g of organic base solution, stirred at 50°C for 0.75 h, and then filtered and separated. The filter residue was washed with deionized water 4 times, dried at 70°C for 9 h, and then calcined at 450°C for 3 h, and ground through a 300-mesh sieve to obtain an alkali-modified molecular sieve carrier.

[0038] Example 5

[0039] See also Figure 1As shown, this embodiment discloses a method for preparing an integrated flue gas treatment material for a waste incineration power plant, comprising the following steps:

[0040] Step (1) 10 g of glycerol and 60 g of isopropanol were mixed and stirred for 13 min, then 20.5 g of the MgO microspheres prepared in Example 1 were added, and ultrasonic treatment was performed for 1.5 h. Then 49.3 g of a 50 wt% manganese nitrate solution was added, and the mixture was stirred for 0.75 h. The mixture was transferred to a reactor and subjected to a hydrothermal reaction at 185° C. for 10 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 4 times. The residue was dried at 70° C. for 9 h, and then calcined at 450° C. for 3 h. The residue was ground through a 850 mesh sieve to obtain MgO-MnO 2 Core-shell powder;

[0041] Step (2) 10 g of glycerol and 60 g of isopropanol were mixed and stirred for 13 min, and then 20.5 g of MgO-MnO was added. 2 The core-shell powder was ultrasonically treated for 1.5 h, and then 62.7 g of zinc acetate and 12.5 g of citric acid monohydrate were added. After continuous stirring for 0.75 h, the powder was transferred to a reactor and subjected to hydrothermal reaction at 185 °C for 10 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 4 times, dried at 70 °C for 9 h, and then calcined at 450 °C for 3 h. The residue was ground through a 850 mesh sieve to obtain MgO-MnO 2 -ZnO core-shell powder;

[0042] Step (3) 10 g of the alkali-modified molecular sieve carrier prepared in Example 2, 1.5 g of MgO-MnO 2 -ZnO core-shell powder and 0.3g kaolin were added to 150g deionized water, stirred at 70°C until dry, then calcined at 450°C for 3h, ground through a 200-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0043] Example 6

[0044] See also Figure 1 As shown, this embodiment discloses a method for preparing an integrated flue gas treatment material for a waste incineration power plant, comprising the following steps:

[0045] Step (1) 10 g of glycerol and 40 g of isopropanol were mixed and stirred for 15 min, then 18 g of the MgO microspheres prepared in Example 1 were added, and ultrasonic treatment was performed for 2 h, and then 3.4 g of a 50 wt% manganese acetate solution was added, and the mixture was stirred for 1 h, and then the mixture was transferred to a reactor, and hydrothermally reacted at 160° C. for 12 h, filtered, and the residue was washed with deionized water and anhydrous ethanol for 3 times, dried at 80° C. for 6 h, and then calcined at 500° C. for 2 h, and ground through an 800 mesh sieve to obtain MgO-MnO 2 Core-shell powder;

[0046] Step (2) 10 g of glycerol and 80 g of isopropanol were mixed and stirred for 10 min, and then 20 g of MgO-MnO 2 The core-shell powder was ultrasonically treated for 1 h, and then 123.7 g of zinc acetate and 0.17 g of citric acid monohydrate were added. After continuous stirring for 1 h, the powder was transferred to a reactor and subjected to hydrothermal reaction at 160 °C for 12 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 3 times, dried at 80 °C for 6 h, and then calcined at 500 °C for 2 h. The residue was ground through an 800 mesh sieve to obtain MgO-MnO 2 -ZnO core-shell powder;

[0047] Step (3) 10 g of the alkali-modified molecular sieve carrier prepared in Example 3, 2.5 g of MgO-MnO 2 -ZnO core-shell powder and 0.1g montmorillonite were added to 200g deionized water, stirred at 60°C until dry, then calcined at 500°C for 2h, ground through a 100-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0048] Example 7

[0049] See also Figure 1 As shown, this embodiment discloses a method for preparing an integrated flue gas treatment material for a waste incineration power plant, comprising the following steps:

[0050] Step (1) 10 g of glycerol and 80 g of isopropanol were mixed and stirred for 10 min, then 36 g of the MgO microspheres prepared in Example 1 were added, and ultrasonic treatment was performed for 1 h. Then 95.1 g of a 50 wt% manganese nitrate solution was added, and the stirring treatment was continued for 0.5 h. The mixture was transferred to a reactor and subjected to a hydrothermal reaction at 210° C. for 8 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 5 times. The residue was dried at 60° C. for 12 h, and then calcined at 400° C. for 4 h. The residue was ground through a 900 mesh sieve to obtain MgO-MnO 2 Core-shell powder;

[0051] Step (2) 10 g of glycerol and 40 g of isopropanol were mixed and stirred for 15 min, and then 5 g of MgO-MnO 2 The core-shell powder was ultrasonically treated for 2 h, and then 1.72 g of zinc acetate and 24.8 g of citric acid monohydrate were added. After continuous stirring for 0.5 h, the powder was transferred to a reactor and subjected to hydrothermal reaction at 210 °C for 8 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 5 times, dried at 60 °C for 12 h, and then calcined at 400 °C for 4 h. The residue was ground through a 900 mesh sieve to obtain MgO-MnO 2 -ZnO core-shell powder;

[0052] Step (3) 10 g of the alkali-modified molecular sieve carrier prepared in Example 4, 0.5 g of MgO-MnO2 -ZnO core-shell powder and 0.5g kaolin were added to 100g deionized water, stirred at 80°C until dry, then calcined at 400°C for 4h, ground through a 300-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0053] Example 8

[0054] See also Figure 1 As shown, this embodiment discloses a method for preparing an integrated flue gas treatment material for a waste incineration power plant, comprising the following steps:

[0055] Step (1) 10 g of glycerol and 50 g of isopropanol were mixed and stirred for 14 min, then 10 g of the MgO microspheres prepared in Example 1 were added, and ultrasonic treatment was performed for 1.8 h. Then 15 g of a 50 wt% manganese acetate solution was added, and the stirring treatment was continued for 0.8 h. The mixture was transferred to a reactor and subjected to a hydrothermal reaction at 170° C. for 11 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 4 times, dried at 75° C. for 7 h, and then calcined at 480° C. for 2 h. The residue was ground through a 850 mesh sieve to obtain MgO-MnO 2 Core-shell powder;

[0056] Step (2) 10 g of glycerol and 70 g of isopropanol were mixed and stirred for 11 min, and then 10 g of MgO-MnO 2 The core-shell powder was ultrasonically treated for 1 h, and then 90 g of zinc acetate and 5 g of citric acid monohydrate were added. After continuous stirring for 0.8 h, it was transferred to a reactor and hydrothermally reacted at 170 ° C for 11 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 3 times, dried at 75 ° C for 7 h, and then calcined at 480 ° C for 2 h. It was ground through a 850 mesh sieve to obtain MgO-MnO 2 -ZnO core-shell powder;

[0057] Step (3) 10 g of the alkali-modified molecular sieve carrier prepared in Example 2, 2 g of MgO-MnO 2 -ZnO core-shell powder and 0.2g montmorillonite were added to 180g deionized water, stirred at 65°C until dry, then calcined at 480°C for 3h, ground through a 200-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0058] Example 9

[0059] See also Figure 1 As shown, this embodiment discloses a method for preparing an integrated flue gas treatment material for a waste incineration power plant, comprising the following steps:

[0060] Step (1) 10 g of glycerol and 70 g of isopropanol were mixed and stirred for 11 min, then 30 g of the MgO microspheres prepared in Example 1 were added, and ultrasonic treatment was performed for 1 h. Then 80 g of a 50 wt% manganese nitrate solution was added, and the mixture was stirred for 0.5 h. The mixture was transferred to a reactor and subjected to a hydrothermal reaction at 200° C. for 9 h. The mixture was filtered, and the residue was washed with deionized water and anhydrous ethanol for 5 times, dried at 65° C. for 10 h, and then calcined at 420° C. for 3 h. The mixture was ground through an 800 mesh sieve to obtain MgO-MnO 2 Core-shell powder;

[0061] Step (2) 10 g of glycerol and 50 g of isopropanol were mixed and stirred for 13 min, and then 15 g of MgO-MnO was added. 2 The core-shell powder was ultrasonically treated for 2 h, and then 30 g of zinc acetate and 18 g of citric acid monohydrate were added. After continuous stirring for 0.5 h, the powder was transferred to a reactor and subjected to hydrothermal reaction at 200 °C for 9 h. The residue was filtered and washed with deionized water and anhydrous ethanol for 5 times, dried at 65 °C for 11 h, and then calcined at 420 °C for 3 h. The residue was ground through an 800 mesh sieve to obtain MgO-MnO 2 -ZnO core-shell powder;

[0062] Step (3) 10 g of the alkali-modified molecular sieve carrier prepared in Example 3, 1 g of MgO-MnO 2 -ZnO core-shell powder and 0.4g binder were added to 120g deionized water, stirred at 75°C until dry, then calcined at 420°C for 4h, ground through a 200-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0063] The binder includes at least one of kaolin and montmorillonite.

[0064] Comparative Example 1

[0065] Comparative Example 1 Compared with Example 5, in the process of preparing the integrated flue gas treatment material for waste incineration power plants, MgO microspheres were used instead of MgO-MnO 2 -ZnO core-shell powder, other conditions remain unchanged, as follows:

[0066] 10 g of the alkali-modified molecular sieve carrier prepared in Example 2, 1.5 g of MgO microspheres and 0.3 g of kaolin were added to 150 g of deionized water, stirred at 70° C. until dry, then calcined at 450° C. for 3 h, and ground through a 200-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0067] Comparative Example 2

[0068] Comparative Example 2 Compared with Example 5, in the process of preparing the integrated flue gas treatment material for waste incineration power plants, MgO-MnO2 Core-shell powder replaces MgO-MnO 2 -ZnO core-shell powder, other conditions remain unchanged, as follows:

[0069] 10 g of the alkali-modified molecular sieve carrier prepared in Example 2, 1.5 g of MgO-MnO 2 The core-shell powder and 0.3 g of kaolin were added to 150 g of deionized water, stirred at 70° C. until dry, then calcined at 450° C. for 3 h, and ground through a 200-mesh sieve to obtain an integrated flue gas treatment material for a waste incineration power plant.

[0070] Comparative Example 3

[0071] Comparative Example 3 Compared with Example 5, in the process of preparing the integrated flue gas treatment material for waste incineration power plants in Comparative Example 3, no alkali-modified molecular sieve carrier was added, i.e., the MgO-MnO prepared in step (2) 2 -ZnO core-shell powder is the integrated flue gas treatment material for waste incineration power plants, and other conditions remain unchanged.

[0072] Experimental example

[0073] Experimental conditions: SO 2 500mg / Nm 3 、NO x 200mg / Nm 3 、HCl 100mg / Nm 3 , Temperature: 200℃, Flue gas flow: 30000Nm 3 / h, flue gas flow rate: 7m / s, catalyst dosage: 250kg / h.

[0074] The integrated waste incineration power plant flue gas treatment materials of Examples 5-9 and Comparative Examples 1-3 were used to treat the original flue gas, and the final content of each component in the waste gas of each group after treatment was tested. The test results are shown in Table 1:

[0075] Table 1

[0076]

[0077] From the test results in Table 1, it can be seen that the integrated flue gas treatment material for waste incineration power plants prepared by Example 5 of the present invention has a good removal rate for flue gas. 2 -ZnO core-shell powder is better than adding MgO microspheres, MgO-MnO 2 The core-shell powder has better flue gas removal efficiency; from the comparison between Comparative Example 3 and Example 5, it can be seen that adding alkali-modified molecular sieve carrier is better than adding MgO-MnO alone. 2-ZnO core-shell powder has better flue gas removal efficiency.

[0078] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0079] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing an integrated flue gas treatment material for a waste incineration power plant, characterized in that: The following steps are involved: Step (1) mixing glycerol and isopropanol, stirring, adding MgO microspheres, ultrasonically treating, and then adding a manganese salt solution, stirring, transferring to a reactor, hydrothermally reacting, filtering, washing, drying, calcining, grinding and sieving to obtain MgO-MnO2 core-shell powder; Step (2) mixing glycerol and isopropanol, stirring, adding MgO-MnO2 core-shell powder, ultrasonically treating, adding zinc salt and pore-forming agent, continuously stirring, transferring to a reactor, hydrothermally reacting, filtering, washing, drying, calcining, grinding and sieving to obtain MgO-MnO2-ZnO core-shell powder; Step (3) adding the alkali-modified molecular sieve carrier, MgO-MnO2-ZnO core-shell powder and the binder into deionized water, stirring until dry, calcining, grinding and sieving to obtain the integrated flue gas treatment material for waste incineration power plants.

2. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 1, characterized in that: In the step (1), the mass ratio of glycerol, isopropanol, MgO microspheres and manganese salt solution is 1:(4-8):(0.5-3.6):(0.34-9.51); the stirring treatment time is 10-15 minutes; the ultrasonic treatment time is 1-2 hours; the manganese salt solution includes one of 50wt% manganese nitrate solution and 50wt% manganese acetate solution; the stirring treatment time is continued for 0.5-1 hour; the hydrothermal reaction conditions are: the hydrothermal reaction temperature is 160-210°C, and the hydrothermal reaction time is 8-12 hours; the washing method is: the filter residue is washed with deionized water and anhydrous ethanol for 3-5 times; the drying conditions are: the drying temperature is 60-80°C, and the drying time is 6-12 hours; the calcination conditions are: the calcination temperature is 400-500°C, and the calcination time is 2-4 hours; the mesh number of the ground and sieved is 800-900 meshes.

3. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 1, characterized in that: In the step (2), the mass ratio of glycerol, isopropanol, MgO-MnO2 core-shell powder, zinc salt and pore-forming agent is 1:(4-8):(0.5-3.6):(0.17-12.4):(0.017-2.48); the stirring treatment time is 10-15 min; the ultrasonic treatment time is 1-2 h; the continuous stirring time is 0.5-1 h; the hydrothermal reaction conditions: the hydrothermal reaction temperature is 160-210°C, and the hydrothermal reaction time is 8-12 h; the washing method: the filter residue is washed 3-5 times with deionized water and anhydrous ethanol; the drying conditions: the drying temperature is 60-80°C, and the drying time is 6-12 h; the calcination conditions: the calcination temperature is 400-500°C, and the calcination time is 2-4 h; the zinc salt is zinc acetate; the pore-forming agent is citric acid monohydrate; the mesh number of the ground and sieved is 800-900 mesh.

4. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 1, characterized in that: In the step (3), the mass ratio of the alkali-modified molecular sieve carrier, MgO-MnO2-ZnO core-shell powder, binder, and deionized water is 1:(0.05-0.25):(0.01-0.05):(10-20); the stirring temperature is 60-80°C; the calcination conditions are: the calcination temperature is 400-500°C, and the calcination time is 2-4h; the binder includes at least one of kaolin and montmorillonite; and the mesh number of the ground and sieved is 100-300 mesh.

5. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 1, characterized in that: The preparation method of the MgO microspheres comprises the following steps: Deionized water and anhydrous ethanol are mixed, stirred, and then magnesium salt and ethylenediaminetetraacetic acid are added. After continued stirring, the mixture is transferred to a reactor, subjected to hydrothermal reaction, filtered, washed, dried, calcined, ground and sieved to obtain MgO microspheres.

6. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 5, characterized in that: The stirring treatment time is 5-10min; the stirring treatment time is continued for 1-2h; the hydrothermal reaction conditions: the hydrothermal reaction temperature is 160-210℃, and the hydrothermal reaction time is 8-12h; the washing method: the filter residue is washed 3-5 times with deionized water and anhydrous ethanol; the drying conditions: the drying temperature is 60-80℃, and the drying time is 6-12h; the calcination conditions: the calcination temperature is 400-500℃, and the calcination time is 2-4h; the magnesium salt is magnesium nitrate; the mesh number of the ground and sieved is 800-900 mesh.

7. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 1, characterized in that: The preparation method of the base-modified molecular sieve carrier comprises the following steps: The molecular sieve is added into the organic alkali solution, stirred, filtered, washed, dried, calcined, ground and sieved to obtain the alkali-modified molecular sieve carrier.

8. The method for preparing the integrated flue gas treatment material for waste incineration power plants according to claim 7, characterized in that: The mass ratio of the molecular sieve and the organic alkali solution is (0.1-0.5):1; the stirring treatment conditions: the stirring treatment time is 0.5-1h, and the stirring treatment temperature is 40-60°C; the washing method: the filter residue is washed with deionized water for 3-5 times; the drying conditions: the drying temperature is 60-80°C, and the drying time is 6-12h; the calcination conditions: the calcination temperature is 400-500°C, and the calcination time is 2-4h; the organic alkali solution is a 25wt% tetrabutylammonium hydroxide aqueous solution; the molecular sieve includes one of a USY molecular sieve, a ZSM-5 molecular sieve, and a BETA molecular sieve; the mesh number of the ground and sieved is 100-300 meshes.

9. An integrated flue gas treatment material for waste incineration power plants, characterized in that: The material is obtained by the preparation method of the integrated flue gas treatment material for waste incineration power plants as described in any one of claims 1 to 8.

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