阅读说明：本技术 一种选择性热烧结成型3d打印脱汞袋笼及其制备方法 (Selective thermal sintering molding 3D printing demercuration bag cage and preparation method thereof ) 是由 杨嵩 刘茜 程广文 郭中旭 付康丽 姚明宇 赵瀚辰 杨成龙 蔡铭 于 2020-11-21 设计创作，主要内容包括：本发明公开了一种选择性热烧结成型3D打印脱汞袋笼及其制备方法,以脱汞催化粉体、聚四氟乙烯粉末、纳米二氧化硅、聚酰亚胺粉末、双十二碳醇酯、领苯二甲酸二辛脂为原料,经球磨、熔融、搅拌、挤出造粒后获得3D打印用材料,通过选择性热烧结3D打印技术制备脱汞袋笼。本发明跳出滤袋脱汞的框架,转变思路,将功能和主体有机结合在一个主体上,采用3D打印技术将催化剂负载于滤袋袋笼上,制备出具有脱汞功能的袋笼,催化剂负载量大,催化剂在袋笼中分布均匀,袋笼上布满微孔,提高袋笼与烟气的接触面积,与常规袋笼相比,本发明对滤袋的支撑更加充分且均匀,进一步降低了滤袋表面的受力,延长了滤袋的寿命,便于工业化规模生产,工程应用价值高。(The invention discloses a selective thermal sintering molded 3D printing demercuration bag cage and a preparation method thereof, which take demercuration catalytic powder, polytetrafluoroethylene powder, nano silicon dioxide, polyimide powder, docosanol ester and dioctyl phthalate as raw materials, obtain a 3D printing material after ball milling, melting, stirring and extrusion granulation, and prepare the demercuration bag cage by a selective thermal sintering 3D printing technology. The support structure of the invention jumps out of a filter bag demercuration frame, changes the thought, organically combines the functions and the main body into one main body, and adopts the 3D printing technology to load the catalyst on the filter bag cage to prepare the bag cage with the demercuration function, the catalyst loading capacity is large, the catalyst is uniformly distributed in the bag cage, micropores are distributed on the bag cage, and the contact area of the bag cage and the flue gas is improved.)

1. A preparation method of a selective thermal sintering molding 3D printing demercuration bag cage is characterized by comprising the following steps:

(1) mixing 30-55 parts by weight of demercuration catalyst powder, 20-45 parts by weight of polytetrafluoroethylene powder, 10-20 parts by weight of polyimide powder, 0.5-4 parts by weight of behenyl ester and 5-10 parts by weight of nano silicon dioxide, performing ball milling, performing melting treatment to obtain a material, adding 0.2-4 parts by weight of dioctyl phthalate into the material, stirring, and extruding and granulating to obtain a printing material for 3D printing;

(2) creating a three-dimensional model of the demercuration bag cage, wherein the main body of the demercuration bag cage is a straight cylinder provided with micropores, the bottom of the straight cylinder is also provided with micropores, and the size and the interval of the micropores are set;

(3) carrying out slicing treatment on the three-dimensional model of the demercuration bag cage obtained in the step (2), and setting the layer height and the wall thickness to obtain a three-dimensional model of the demercuration bag cage capable of executing printing;

(4) adopting a selective thermal sintering method, firstly uniformly paving the printing material in the step (1) on an operation table through a powder paving roller, simultaneously preheating the operation table, then setting the moving speed and power of a printing head, and then performing 3D printing according to the mercury removal bag cage three-dimensional model capable of performing printing in the step (3);

(5) and cooling and shaping after printing is finished, and removing the unsintered powder after cooling and shaping to finally obtain the demercuration bag cage.

2. The preparation method of the selective thermal sintering molding 3D printing demercuration bag cage according to claim 1, wherein the demercuration catalytic powder in the step (1) is obtained by a specific process comprising: adding 15 parts of copper chloride, 16 parts of potassium chloride and 10 parts of ferric chloride into deionized water, stirring to form a solution, adding 90 parts of gamma-alumina powder into the solution, continuously stirring until the gamma-alumina powder is uniformly dispersed, concentrating, drying, roasting in air at 500 ℃ for 6 hours, grinding, and sieving to prepare particles of 1200 meshes, thereby obtaining the mercury oxidation catalyst.

3. The method for preparing the selective thermal sintering molded 3D printed demercuration bag cage according to claim 1, wherein the polytetrafluoroethylene powder in the step (1) has a size of 500nm to 50 μm.

4. The method for preparing the selectively hot-sintered molded 3D-printed demercuration bag cage according to claim 1, wherein the 3D-printed material in the step (1) has a size of 25-100 μm.

5. The preparation method of the selective thermal sintering molding 3D printing demercuration bag cage according to claim 1, wherein the melting temperature in the step (1) is 380-400 ℃.

6. The preparation method of the selective thermal sintering molding 3D printing demercuration bag cage according to claim 1, wherein the micropore size in the 3D modeling in the step (2) is 2-10 mm, and the micropore distance is 4-15 mm.

7. The preparation method of the selective thermal sintering molding 3D printing demercuration bag cage according to claim 1, wherein in the step (3), the height of the layer is 0.2-1 mm, the wall thickness is 0.1-0.3 mm, the size of the micropores is 2-10 mm, and the distance between the micropores is 4-15 mm.

8. The method for preparing the selective hot sintering molding 3D printing mercury-removing bag cage according to claim 1, wherein the moving speed of the printing head in the step (4) is 1000-4000mm/min, and the power is 5-30W.

9. A demercuration bag cage, characterized in that, prepared by the method of any one of claims 1 to 8, the main body is a straight cylinder provided with micropores (2), the bottom of the straight cylinder is a cage bottom (4), the cage bottom (4) is provided with micropores (2), the diameter of the micropores is 2 to 10mm, and the distance (3) between the micropores is 4 to 15 mm.

10. The demercuration bag cage according to claim 9, wherein the top end of the straight cylinder is provided with a flanged upper ring opening (1).

Technical Field

The invention belongs to the technical field of coal-fired flue gas purification, and particularly relates to a selective thermal sintering molded 3D printing demercuration bag cage and a preparation method thereof.

Background

In recent years, with the national environmental protection importance, coal-fired flue gas demercuration has received wide attention. Country, region and industryThe corresponding emission standard of the atmospheric pollutants of the coal-fired boiler is promulgated, and restrictive indexes (50 ug/m) are provided for the emission concentration of mercury³/GB13271-2014,8ug/m³/DB50/659-2016,30ug/m³/DB31/387-2017,8ug/m³/DB 31/860-2014). Therefore, the research on coal-fired flue gas demercuration technology is of great significance.

The SCR demercuration is to utilize an SCR catalyst to remove elemental mercury (Hg) difficult to remove from flue gas⁰) Catalytic oxidation to easily trapped ionic mercury (Hg)²⁺) And then the existing pollutant control equipment (a dust remover and a desulfurizing tower) is utilized to remove the ionic mercury, thereby realizing the demercuration of the flue gas. Compared with the activated carbon injection method which is applied to the engineering of the foreign coal-fired boiler, the method has the advantages of low demercuration cost and simple process, and is more suitable for the environmental protection reconstruction of the coal-fired boiler in China. There are two main ways to realize SCR demercuration: one is to develop a special SCR demercuration catalyst (honeycomb and plate type) to carry out mercury oxidation by means of an SCR demercuration process; the other method is to prepare a demercuration filter bag and carry out mercury oxidation by virtue of a bag-type dust removal process. The former is mainly suitable for coal-fired boilers, and the latter is suitable for industrial boiler (kiln) furnaces.

At present, the preparation method of the demercuration filter bag comprises two methods: (1) the hot pressing method firstly prepares a porous membrane containing the demercuration catalyst, and then fixes the porous membrane on the surface of a conventional filter material through a hot pressing process to form demercuration filter bags (CN110215768A, CN108525514A and CN 110124534A); (2) the impregnation method comprises the steps of preparing a demercuration catalyst or a precursor thereof into a solution (emulsion) as an impregnation solution, impregnating a conventional filter bag, and then drying and calcining to form a demercuration filter bag (CN108926911A, CN109224635A and CN 109603306A). These two methods have the following disadvantages: the catalyst loading capacity in the mercury-removing filter bag prepared by the mercury-removing filter bag is usually smaller and the resistance of the filter bag is larger; the latter filter bags have a poor uniformity of distribution of the catalyst on the filter bag and poor fastness of bonding with the filter bag. The practical application effect of the demercuration filter bag is influenced by the defects.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a selective thermal sintering molded 3D printing demercuration bag cage and a preparation method thereof, a filter bag demercuration frame is skipped, the idea is changed, a catalyst is loaded on the filter bag cage by adopting a 3D printing technology, the bag cage with the demercuration function is prepared, the catalyst loading capacity is large, and the catalyst is uniformly distributed in the bag cage.

In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of a selective thermal sintering molding 3D printing demercuration bag cage comprises the following steps:

(1) mixing 30-55 parts by weight of demercuration catalyst powder, 20-45 parts by weight of polytetrafluoroethylene powder, 10-20 parts by weight of polyimide powder, 0.5-4 parts by weight of behenyl ester and 5-10 parts by weight of nano silicon dioxide, performing ball milling, performing melting treatment to obtain a material, adding 0.2-4 parts by weight of dioctyl phthalate into the material, stirring, and extruding and granulating to obtain a printing material for 3D printing;

(2) creating a three-dimensional model of the demercuration bag cage, wherein the main body of the demercuration bag cage is a straight cylinder provided with micropores, the bottom of the straight cylinder is also provided with micropores, and the size and the interval of the micropores are set;

(3) carrying out slicing treatment on the three-dimensional model of the demercuration bag cage obtained in the step (2), and setting the layer height and the wall thickness to obtain a three-dimensional model of the demercuration bag cage capable of executing printing;

(4) adopting a selective thermal sintering method, firstly uniformly paving the printing material in the step (1) on an operation table through a powder paving roller, simultaneously preheating the operation table, then setting the moving speed and power of a printing head, and then performing 3D printing according to the mercury removal bag cage three-dimensional model capable of performing printing in the step (3);

(5) and cooling and shaping after printing is finished, and removing the unsintered powder after cooling and shaping to finally obtain the demercuration bag cage.

The specific obtaining process of the demercuration catalytic powder in the step (1) comprises the following steps: adding 15 parts of copper chloride, 16 parts of potassium chloride and 10 parts of ferric chloride into deionized water, stirring to form a solution, adding 90 parts of gamma-alumina powder into the solution, continuously stirring until the gamma-alumina powder is uniformly dispersed, concentrating, drying, roasting in air at 500 ℃ for 6 hours, grinding, and sieving to prepare particles of 1200 meshes, thereby obtaining the mercury oxidation catalyst.

The polytetrafluoroethylene powder in the step (1) has the size of 500 nm-50 mu m.

The size of the 3D printing material in the step (1) is 25-100 mu m.

The melting temperature in the step (1) is 380-400 ℃.

The size of the micropores in the 3D modeling in the step (2) is 2-10 mm, and the distance between the micropores is 4-15 mm.

In the step (3), the height of the middle layer is 0.2-1 mm, the wall thickness is 0.1-0.3 mm, the size of the micropores is 2-10 mm, and the distance between the micropores is 4-15 mm.

In the step (4), the moving speed of the printing head is 1000-.

The invention also provides a bag cage prepared based on the method, the main body of the bag cage is a straight cylinder provided with micropores (2), the bottom of the straight cylinder is a cage bottom (4), the micropores (2) are arranged on the cage bottom (4), the diameter of each micropore is 2-10 mm, and the distance (3) between every two micropores is 4-15 mm.

The top end of the straight cylinder is provided with a flanging type upper ring opening (1).

Compared with the prior art, the invention has the following beneficial technical effects:

(1) according to the invention, firstly, the catalyst is implanted into the demercuration bag cage through raw material blending, so that the catalyst loading capacity in the bag cage is large, the catalyst is more uniformly distributed in the bag cage, micropores distributed in the whole bag cage increase the contact area between the bag cage and flue gas, and the demercuration efficiency is improved;

(2) according to the invention, the demercuration bag cage is prepared by adopting a sintering molding 3D printing method, the structural design limit can be fully exerted, the bag cage can have good supporting strength, smaller gas resistance and better demercuration efficiency, the complexity of a filter bag and a bag cage demercuration system can be further seen, and the common filter bag can be improved based on the bag cage, so that the overall performance is improved;

(3) in the raw materials, the polytetrafluoroethylene has good adhesion effect, can play a good main body supporting role for the bag cage after being formed, and simultaneously avoids the reduction of catalytic performance caused by excessive contact of catalyst powder with water by utilizing the good hydrophobicity of the polytetrafluoroethylene; the docosanol ester can improve the oxidation resistance of the bag cage, the nano silicon dioxide has a good reinforcing effect on the bag cage, the strength of the bag cage after molding is further improved, and the dioctyl phthalate improves the granulation extrusion effect in the granulation process and is beneficial to reducing the particle size.

(4) The support for the filter bag prepared by the raw materials and the process is more sufficient and uniform, the stress on the surface of the filter bag is further reduced, and the service life of the filter bag is prolonged; meanwhile, the bag cage has even and many micropores, so that the bag cage has lower air resistance and the catalytic efficiency is also ensured.

The support device is out of a filter bag demercuration frame, changes the thought, organically combines the functions and the structure on a main body, adopts the 3D printing technology to load the catalyst on the filter bag cage to prepare the bag cage with the demercuration function, has large catalyst loading capacity, uniformly distributes the catalyst in the bag cage, is fully distributed with micropores on the bag cage, improves the contact area of the bag cage and the flue gas, and compared with the conventional bag cage, the support device has the advantages that the support device can support the filter bag more fully and uniformly, further reduces the stress on the surface of the filter bag, and prolongs the service life of the filter bag. Meanwhile, as the micropores of the bag cage are uniform and the number of the micropores is large, the resistance of the combination of the conventional filter bag and the demercuration bag cage is smaller than that of the combination of the demercuration filter bag and the conventional bag cage.

Drawings

Fig. 1 is a schematic diagram of a three-dimensional model of a demercuration bag cage.

Fig. 2 is a schematic top view of a practical demercuration bag cage.

Fig. 3 is a schematic side view of an implementable demercuration bag cage.

In the figure: 1 upper ring opening, 2 micropores, 3 micropore intervals and 4 cage bottom.

Detailed Description

The present invention will be described in detail with reference to specific examples.

Referring to fig. 1, 2 and 3, a selective thermal sintering molding 3D printing demercuration bag cage and a preparation method thereof includes the following steps:

(1) mixing 30-55 parts by weight of demercuration catalyst powder, 20-45 parts by weight of polytetrafluoroethylene powder, 10-20 parts by weight of polyimide powder, 0.5-4 parts by weight of behenyl ester and 5-10 parts by weight of nano silicon dioxide, performing ball milling, performing melting treatment to obtain a material, adding 0.2-4 parts by weight of dioctyl phthalate into the material, stirring, and extruding and granulating to obtain a printing material for 3D printing;

(2) creating a three-dimensional model of the demercuration bag cage, wherein the main body of the demercuration bag cage is a straight cylinder provided with micropores, the bottom of the straight cylinder is also provided with micropores, and the size and the interval of the micropores are set;

(3) carrying out slicing treatment on the three-dimensional model of the demercuration bag cage obtained in the step (2), and setting the layer height and the wall thickness to obtain a three-dimensional model of the demercuration bag cage capable of executing printing;

(4) adopting a selective thermal sintering method, firstly uniformly paving the printing material in the step (1) on an operation table through a powder paving roller, simultaneously preheating the operation table, then setting the moving speed and power of a printing head, and then performing 3D printing according to the mercury removal bag cage three-dimensional model capable of performing printing in the step (3);

(5) and cooling and shaping after printing is finished, and removing the unsintered powder after cooling and shaping to finally obtain the demercuration bag cage.

The specific obtaining process of the demercuration catalytic powder in the step (1) comprises the following steps: adding 15 parts of copper chloride, 16 parts of potassium chloride and 10 parts of ferric chloride into deionized water, stirring to form a solution, adding 90 parts of gamma-alumina powder into the solution, continuously stirring until the gamma-alumina powder is uniformly dispersed, concentrating, drying, roasting in air at 500 ℃ for 6 hours, grinding, and sieving to prepare particles of 1200 meshes, thereby obtaining the mercury oxidation catalyst.

In the step (1), the size of the polytetrafluoroethylene powder is 500 nm-50 mu m; the size of the medium 3D printing material is 25-100 mu m; the melting temperature is 380-400 ℃.

The size of the micropores in the 3D modeling in the step (2) is 2-10 mm, and the distance between the micropores is 4-15 mm.

In the step (3), the height of the middle layer is 0.2-1 mm, the wall thickness is 0.1-0.3 mm, the size of the micropores is 2-10 mm, and the distance between the micropores is 4-15 mm.

In the step (4), the moving speed of the printing head is 1000-.

The invention also provides a bag cage prepared based on the method, the main body of the bag cage is a straight cylinder provided with micropores (2), the bottom of the straight cylinder is a cage bottom (4), the micropores (2) are arranged on the cage bottom (4), the diameter of each micropore is 2-10 mm, and the distance (3) between every two micropores is 4-15 mm.

The top end of the straight cylinder is provided with a flanging type upper ring opening (1).

The main body is a straight cylinder provided with micropores 2, the bottom of the straight cylinder is a cage bottom 4, the cage bottom 4 is provided with the micropores 2, the diameter of each micropore is 2-10 mm, and the distance 3 between every two micropores is 4-15 mm; the top of the straight cylinder is provided with a flanging type upper ring opening 1.

It should be noted that the micropores described in the present invention are not necessarily regular circles, and the diameter of the micropore is the average of all radial distances of the micropore.

Example 1

Mixing 6.2kg of demercuration catalyst powder, 5.4kg of polytetrafluoroethylene powder, 2.8kg of polyimide powder, 0.4kg of didodecyl alcohol ester and 1kg of nano-silica, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 220r/min, and grinding is carried out for 5 rounds every 20min, namely the ball milling time is 100 min. Then melting at 380 ℃ to obtain a material A, adding 0.045kg of dioctyl phthalate into the material A, stirring to obtain a material B, and extruding powder particles with the average particle size of 30 mu m by a granulator to obtain a printing material for 3D printing equipment; using Solidworks software to create a 3-dimensional model of the bag cage, the bag cage size being: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 3mm, and the distance between the micropores is 5 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.2mm and the wall thickness to be 0.1 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, meanwhile, the operation table is preheated to 260 ℃, then, after the moving speed of a printing head is set to be 2500mm/min and the power is set to be 30W, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage.

And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 90%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 7.6m³/m²/min。

Example 2

Mixing 7.6kg of demercuration catalyst powder, 5.1kg of polytetrafluoroethylene powder, 2.5kg of polyimide powder, 0.3kg of didodecyl alcohol ester and 1.2kg of nano-silica, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 220r/min, one round is every 20min, and 5 rounds are ground, namely the ball milling time is 100 min. Then carrying out melting treatment at 380 ℃ to obtain a material A, then adding 0.085kg of dioctyl phthalate into the material A, stirring to obtain a material B, and then extruding powder particles with the average particle size of 40 mu m by a granulator to obtain a printing material for 3D printing equipment; using Solidworks software to create a 3-dimensional model of the bag cage, the bag cage size being: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 5mm, and the distance between the micropores is 5 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.2mm and the wall thickness to be 0.2 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, meanwhile, the operation table is preheated to 260 ℃, then, after the moving speed of a printing head is set to be 2500mm/min and the power is set to be 30W, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage.

And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 95%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 8.3m³/m²/min。

Example 3

Mixing 7.6kg of demercuration catalyst powder, 5.1kg of polytetrafluoroethylene powder, 2.5kg of polyimide powder, 0.3kg of didodecyl alcohol ester and 1.25kg of nano-silica, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 250r/min, one round is every 20min, and the ball milling time is 120min for 6 rounds. Then carrying out melting treatment at 400 ℃ to obtain a material A, then adding 0.075kg of dioctyl phthalate into the material A, stirring to obtain a material B, and then extruding powder particles with the average particle size of 60 micrometers through a granulator to obtain a printing material for 3D printing equipment; using Solidworks software to create a 3-dimensional model of the bag cage, the bag cage size being: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 5mm, and the distance between the micropores is 5 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.2mm and the wall thickness to be 0.3 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, meanwhile, the operation table is preheated to 260 ℃, then, after the moving speed of a printing head is set to be 1800mm/min and the power is set to be 25W, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage. And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 97%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 8.35m³/m²/min。

Example 4

Mixing 7.6kg of demercuration catalyst powder, 5.1kg of polytetrafluoroethylene powder, 2.5kg of polyimide powder, 0.3kg of didodecyl alcohol ester and 1.25kg of nano-silica, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 250r/min, one round is every 20min, and the ball milling time is 120min for 6 rounds. Then carrying out melting treatment at 400 ℃ to obtain a material A, then adding 0.075kg of dioctyl phthalate into the material A, stirring to obtain a material B, and then extruding powder particles with the average particle size of 100 micrometers through a granulator to obtain a printing material for 3D printing equipment; using Solidworks software to create a 3-dimensional model of the bag cage, the bag cage size being: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 10mm, and the distance between the micropores is 15 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.6mm and the wall thickness to be 0.3 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, meanwhile, the operation table is preheated to 260 ℃, then, after the moving speed of a printing head is set to be 1800mm/min and the power is set to be 25W, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage.

And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 91.5%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 10.2m³/m²/min。

Example 5

Mixing 7.4kg of demercuration catalyst powder, 5.5kg of polytetrafluoroethylene powder, 2.7kg of polyimide powder, 0.2kg of didodecyl alcohol ester and 1.1kg of nano-silica, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 250r/min, one round is every 20min, and 6 rounds are ground, namely the ball milling time is 120 min. Then melting at 380 ℃ to obtain a material A, adding 0.065kg of dioctyl phthalate into the material A, stirring to obtain a material B, and extruding powder particles with the average particle size of 55 mu m by a granulator to obtain a printing material for 3D printing equipment; a bag cage 3-dimensional model is created using Solidworks software, the collective dimensions being: the bag cage has the following dimensions: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 10mm, and the distance between the micropores is 15 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.8mm and the wall thickness to be 0.3 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, the operation table is preheated to 260 ℃, then, the moving speed of a printing head is set to be 1500mm/min, the power is set to be 20W, and then, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage.

And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 93%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 10.05m³/m²/min。

Example 6

Mixing 9.38kg of demercuration catalyst powder, 4.8kg of polytetrafluoroethylene powder, 3.3kg of polyimide powder, 0.8kg of didodecyl alcohol ester and 2.08kg of nano silicon dioxide, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 250r/min, one round is every 20min, and 6 rounds are ground, namely the ball milling time is 120 min. Then carrying out melting treatment at 400 ℃ to obtain a material A, then adding 0.63kg of dioctyl phthalate into the material A, stirring to obtain a material B, and then extruding powder particles with the average particle size of 60 micrometers through a granulator to obtain a printing material for 3D printing equipment; using Solidworks software to create a 3-dimensional model of the bag cage, the bag cage size being: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 2mm, and the distance between the micropores is 4 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.2mm and the wall thickness to be 0.3 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, meanwhile, the operation table is preheated to 260 ℃, then, after the moving speed of a printing head is set to be 1000mm/min and the power is set to be 5W, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage. And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 94%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 8.15m³/m²/min。

Example 7

Mixing 8.3kg of demercuration catalyst powder, 6.25kg of polytetrafluoroethylene powder, 3.1kg of polyimide powder, 0.1kg of didodecyl alcohol ester and 1.6kg of nano-silica, and placing the mixture on a planetary ball mill for ball milling, wherein the rotating speed of the ball mill is 220r/min, one round is every 20min, and 5 rounds are ground, namely the ball milling time is 100 min. Then melting at 380 ℃ to obtain a material A, adding 0.83kg of dioctyl phthalate into the material A, stirring to obtain a material B, and extruding powder particles with the average particle size of 70 mu m by a granulator to obtain a printing material for 3D printing equipment; using Solidworks software to create a 3-dimensional model of the bag cage, the bag cage size being: the diameter of the upper ring opening is 155mm, the thickness is 5mm, the diameter of the bottom is 120mm, the length of the bag cage is 900mm, the diameter of the micropores is 8mm, and the distance between the micropores is 8 mm. Slicing the created mercury removal bag cage three-dimensional model by using Simplify 3D software, and setting the layer height to be 0.2mm and the wall thickness to be 0.2 mm; the 3D printing adopts a selective thermal sintering technology, firstly, the prepared powder is uniformly paved on an operation table through a powder paving roller, meanwhile, the operation table is preheated to 260 ℃, then, after the moving speed of a printing head is set to be 4000mm/min and the power is set to be 30W, the 3D printing is carried out according to modeling; and (4) after printing is finished, shaping at 100 ℃, cooling, and removing the un-sintered redundant powder to finally obtain the demercuration bag cage.

And (3) carrying out mercury oxidation performance evaluation on the obtained demercuration bag cage on a cloth bag dust removal test bed by using simulated flue gas. And (3) testing the concentrations of the elemental mercury and the divalent mercury in the flue gas at the inlet and the outlet of the bag-type dust remover by using a mercury determinator, and calculating the mercury oxidation efficiency to be 92.5%.

According to GB/T5453-1997 test standard, the air permeability test is carried out on the combination of the conventional PTFE filter bag and the demercuration bag cage under the pressure difference of 200Pa, and the air permeability is 8.9m³/m²/min。

At present, the demercuration catalysis filter bag prepared by an impregnation method is tested according to the standard in the embodiment, and the air permeability is 3.5-7.5 m³/m²Min is less than 7.6-10.2 m of the invention³/m²And/min. As the air permeability is in direct proportion to the resistance, the combination of the conventional filter bag and the demercuration bag cage proves to have smaller resistance compared with the combination of the demercuration filter bag and the conventional bag cage. Meanwhile, due to the adoption of the 3D printing technology for forming, products with different structures and parameters can be conveniently manufactured by changing the model setting. The product has high degree of freedom and strong diversity, and the product has stable quality and strong reliability due to the adoption of automatic control, thereby being suitable for engineering popularization.