A stirring impregnation device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst

Abstract

The application discloses a kind of steel sintering flue gas CO catalytic combustion catalyst production with stirring impregnation device, including kettle body, main stirring paddle, multiple side rotating cylinders, first push piece, second push piece, multiple connecting pieces, multiple stirring blades, main stirring paddle, side rotating cylinder are set to positive and negative rotation, side rotating cylinder upper and lower portion is communicated with kettle body inner cavity respectively, each side rotating cylinder is set with the connecting piece that is circumferentially limited with it and upper and lower sliding connection, multiple stirring blades should be fixed on connecting piece, first push piece is screwed with main stirring paddle, multiple connecting pieces pass through first push piece and are circumferentially slidably set with it, first push piece is slidably connected with kettle body inner wall, second push piece includes connecting portion and push disc portion, second push piece is circumferentially slidably connected with connecting piece by connecting portion and is connected with upper and lower limit, first push piece is abutted to connecting portion, push disc portion passes through first push piece and is spaced apart from first push piece.The application can promote the uniform dispersion of active substance, improve the catalytic oxidation activity and stability of catalyst.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of catalyst production equipment, in particular to a stirring impregnation device for producing steel sintering flue gas CO catalytic combustion treatment catalyst. BACKGROUND

[0002] The steel sintering flue gas CO catalytic combustion treatment catalyst belongs to a denitration catalyst. The preparation of this kind of catalyst usually involves stirring and impregnating a catalyst carrier in a precursor solution containing active components (transition metal precursors, noble metal precursors, etc.), removing the remaining liquid after adsorption equilibrium is reached, and then drying, calcining, and activating the catalyst carrier to prepare the catalyst product. However, the existing stirring impregnation devices usually use a single stirring blade to stir horizontally and circumferentially, which cannot achieve ideal mixing effect, resulting in uneven distribution of active components, affecting the quality and performance of the final catalyst, and making the catalyst unable to fully function. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a stirring impregnation device for producing steel sintering flue gas CO catalytic combustion treatment catalyst. The device can promote the uniform dispersion of active substances and improve the catalytic oxidation activity and stability of the catalyst through multiple ways of material flow.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A stirring impregnation device for producing steel sintering flue gas CO catalytic combustion treatment catalyst, comprising a kettle body and a main stirring paddle, a plurality of side rotating cylinders, a first pushing piece, a second pushing piece, a plurality of connecting pieces, and a plurality of stirring blades arranged in the kettle body. The plurality of side rotating cylinders are circumferentially distributed outside the main stirring paddle. The main stirring paddle and the side rotating cylinders are both arranged for forward and reverse rotation. The upper and lower parts of the side rotating cylinders are respectively connected with the inner cavity of the kettle body. Each side rotating cylinder is sleeved with a connecting piece which is connected with the side rotating cylinder in the circumferential direction and is connected with the side rotating cylinder in the up-down direction. A plurality of stirring blades are fixed on the upper part of the connecting piece one by one. The first pushing piece is screwed on the main stirring paddle, and the plurality of connecting pieces pass through the first pushing piece and are sleeved with the first pushing piece in the circumferential direction. The first pushing piece is connected with the inner wall of the kettle body in the up-down direction. The second pushing piece comprises a plurality of connecting parts and a plurality of pushing disc parts. The second pushing piece is connected with the connecting piece in the circumferential direction and is connected with the connecting piece in the up-down direction through the connecting part. The first pushing piece abuts against the connecting part upward. The pushing disc part passes through the first pushing piece and is spaced from the first pushing piece.

[0006] When the first pushing piece moves downward, the first pushing piece is sealingly fitted with the pushing disc part and can push the second pushing piece to move downward, thereby driving the connecting piece and the stirring blade to move downward while rotating with the side rotating drum; when the first pushing piece moves upward after moving downward, the first pushing piece moves upward to abut against the connecting part and is disengaged from the sealing fitting with the pushing disc part, and the first pushing piece pushes the second pushing piece to move upward and drives the connecting piece and the stirring blade to move upward while rotating with the side rotating drum.

[0007] The second pushing piece further comprises an annular inner ring and an annular outer ring distributed inside and outside, a plurality of the pushing disc parts are distributed in two rings inside and outside and are connected to the inner ring and the outer ring respectively, and a plurality of the connecting parts are circumferentially distributed and connected to the inner ring and the outer ring.

[0008] The connecting piece is provided with a circular ring-shaped sliding groove at the upper portion, and the connecting part comprises a circular ring-shaped sleeve ring part which is circumferentially slidingly fitted with the sliding groove.

[0009] The connecting part further comprises a connecting rod part connected to the outer walls on both sides of the sleeve ring part, the inner side connecting rod part is connected to the inner ring, the outer side connecting rod part is connected to the outer ring, and the first pushing piece abuts upward to the connecting rod part.

[0010] A plurality of through holes are formed in the first pushing piece, the through holes are in the shape of a circular truncated cone which is small at the top and large at the bottom, the pushing disc part comprises a circular truncated cone-shaped main disc part which is sealingly fitted with the through hole.

[0011] The pushing disc part further comprises a connecting column which is connected to the upper and lower portions of the circular truncated cone-shaped main disc part, and the connecting column corresponds to the inner ring and the outer ring.

[0012] The upper portion and the lower portion of the side rotating drum are respectively provided with circumferentially distributed perforations, and the first pushing piece drives the stirring blade to move in the area between the upper portion perforations and the lower portion perforations.

[0013] A plurality of the side rotating drums are drivingly connected to the main stirring paddle.

[0014] The beneficial effects of the present application are as follows: the main stirring paddle is used for stirring, the first pushing piece is used for driving the stirring blade to rotate and lift at the same time, the first pushing piece is used for pushing the material below into the side rotating drum during the descending process of the first pushing piece, and the material is then radiated into the inner cavity of the kettle above the first pushing piece, the stirring blade is used for stirring, and the first pushing piece is used for pushing the second pushing piece to move upward, so that a gap is formed between the first pushing piece and the second pushing piece, the material above the first pushing piece can be dispersed and fallen in a radial manner, the material can flow in multiple directions through multiple ways, the uniform dispersion of the active substance is promoted, and the catalytic oxidation activity and stability of the catalyst are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure diagram of the present application is shown in the figure;

[0016] Figure 2 is Figure 1 enlarged view of A in the middle;

[0017] Figure 3 is Figure 1 sectional view of B-B in the middle;

[0018] Figure 4 is a perspective view of the second pushing piece;

[0019] Figure 5 is a structural schematic view when the first pushing piece pushes the second pushing piece and the stirring blade moves up.

[0020] In the figure: kettle body 1, baffle 11, main stirring paddle 2, main shaft 21, blade 22, gear A 23, side rotating cylinder 3, shaft key 31, perforation 32, side upper shaft part 33, gear B 34, first pushing piece 4, through hole 41, second pushing piece 5, inner ring 51, outer ring 52, connecting part 53, collar part 531, connecting rod part 532, flange 5321, pushing disc part 54, connecting column 541, main disc part 542, connecting piece 6, sliding slot 61, stirring blade 7, motor 8. DETAILED DESCRIPTION

[0021] The application will be further described below in combination with the drawings and specific embodiments:

[0022] As Figures 1-5 shown, a stirring impregnation device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst, comprising a kettle body 1 and a main stirring paddle 2, a plurality of side rotating cylinders 3, a first pushing piece 4, a second pushing piece 5, a plurality of connecting pieces 6, and a plurality of stirring blades 7 arranged in the kettle body 1 respectively, the plurality of side rotating cylinders 3 are circumferentially distributed at the outer circle of the main stirring paddle 2, the main stirring paddle 2 and the side rotating cylinder 3 are both arranged in forward and reverse rotation, the upper part and the lower part of the side rotating cylinder 3 are respectively communicated with the inner cavity of the kettle body 1, each side rotating cylinder 3 is sleeved with a connecting piece 6 which is connected in circumferential limiting and sliding connection, a plurality of stirring blades 7 are fixed on the upper part of the connecting piece 6 one by one, the stirring blades 7 are located above the first pushing piece 4 and the second pushing piece 5, the first pushing piece 4 is screwed on the main stirring paddle 2, and a plurality of connecting pieces 6 pass through the first pushing piece 4 and are sleeved with the first pushing piece 4 in circumferential sliding, the first pushing piece 4 is slidingly connected with the inner wall of the kettle body 1, the second pushing piece 5 comprises a plurality of connecting parts 53 and a plurality of pushing disc parts 54, the second pushing piece 5 is slidingly connected with the connecting piece 6 in circumferential direction and is connected in limiting connection in up and down direction through the connecting part 53, the first pushing piece 4 abuts upward to the connecting part 53, and the pushing disc part 54 passes through the first pushing piece 4 and is spaced from the first pushing piece 4.

[0023] When the first pushing piece 4 moves downward, the first pushing piece 4 is sealingly embedded with the pushing disc part 54 and can push the second pushing piece 5 to move downward, and in turn drive the connecting piece 6 and the stirring blade 7 to move downward while the edge rotating cylinder 3 rotates; when the first pushing piece 4 moves upward after moving downward, the first pushing piece 4 moves upward to abut against the connecting part 53 and is disengaged from the sealing embedding with the pushing disc part 54, and the first pushing piece 4 pushes the second pushing piece 5 to move upward and in turn drives the connecting piece 6 and the stirring blade 7 to move upward while the edge rotating cylinder 3 rotates.

[0024] The plurality of edge rotating cylinders 3 are in driving connection with the main stirring paddle 2. The main stirring paddle 2 comprises a main shaft 21 and a blade 22 installed at the lower part of the main shaft 21, and the upper part of the edge rotating cylinder 3 is connected with an edge upper shaft part 33, which is in meshing driving connection with the upper part of the main shaft 21. A partition plate 11 is arranged in the upper part of the kettle body 1, and the main shaft 21 and the edge upper shaft part 33 are both rotatably arranged through the partition plate 11. An A gear 23 is arranged on the main shaft 21, and a B gear 34 is arranged on the edge upper shaft part 33, and each B gear 34 is in meshing with the A gear 23. The lower end of the edge rotating cylinder 3 is rotatably connected with the bottom of the kettle body 1. A motor 8 is arranged at the top of the kettle body 1, and the motor 8 is connected with the main shaft 21 to drive the main stirring paddle 2 to rotate in opposite directions, and the main stirring paddle 2 drives the edge rotating cylinder 3 to rotate in opposite directions.

[0025] The upper part and the lower part of the edge rotating cylinder 3 are respectively provided with circumferentially distributed perforations 32; the first pushing piece 4 drives the stirring blade 7 to move in the area between the upper perforations 32 and the lower perforations 32.

[0026] The outer wall of the edge rotating cylinder 3 is provided with circumferentially distributed shaft keys 31, which are arranged along the length direction of the edge rotating cylinder 3, and the connecting piece 6 is in clamping and up-down sliding connection with the shaft keys 31.

[0027] The second pushing piece 5 further comprises an annular inner ring 51 and an annular outer ring 52 distributed in the inner and outer circles, and a plurality of pushing disc parts 54 are distributed in the inner and outer circles and are respectively connected to the inner ring 51 and the outer ring 52. That is, the lower end of the inner ring 51 is connected with the inner circle pushing disc part 54, and the lower end of the outer ring 52 is connected with the outer circle pushing disc part 54. A plurality of connecting parts 53 are circumferentially distributed and connected with the inner ring 51 and the outer ring 52. The main stirring paddle 2 is coaxially distributed with the inner and outer circles of the inner ring 51. The inner circle pushing disc part 54 is connected through the inner ring 51, the outer circle pushing disc part 54 is connected through the outer ring 52, and the inner ring 51 and the outer ring 52 are connected through the connecting part 53, so that the second pushing piece 5 is integrated. In order to facilitate the installation of the second pushing piece 5, the inner ring 51, the outer ring 52, the connecting part 53 and the pushing disc part 54 are in detachable structure and are connected through fasteners.

[0028] The upper part of the connecting piece 6 is provided with a circular ring-shaped sliding groove 61, and the connecting part 53 comprises a circular ring-shaped sleeve ring part 531, which is in circumferential sliding embedding with the sliding groove 61.

[0029] The connecting part 53 further comprises connecting rod parts 532 connected to the outer walls on both sides of the collar part 531, the inner connecting rod part 532 is connected to the inner ring 51, the outer connecting rod part 532 is connected to the outer ring 52, and the first pushing piece 4 is upwardly abutted to the connecting rod part 532. Specifically, the lower surface of the connecting rod part 532 is protruded to form a flange 5321, and the first pushing piece 4 is upwardly abutted to the flange 5321.

[0030] A plurality of through holes 41 are formed in the first pushing piece 4, the through holes 41 are in the shape of a circular truncated cone column with a small upper part and a large lower part, the pushing disc part 54 comprises a circular truncated cone column-shaped main disc part 542, and the main disc part 542 is sealingly fitted with the through holes 41. The pushing disc part 54 further comprises a connecting column 541 connected to the upper and lower parts of the circular truncated cone column-shaped main disc part 542, and the connecting column 541 is correspondingly connected to the inner ring 51 and the outer ring 52.

[0031] In fact, in order to facilitate the installation of the first pushing piece 4, the connecting piece 6 comprises a cylindrical A connecting part and a cylindrical B connecting part which are detachably connected in an up-down manner, the upper part of the cylindrical B connecting part is arranged on the circular annular stepped part, and the A connecting part and the B connecting part are connected in an up-down manner, so that the lower surface of the A connecting part is matched with the stepped part to form a sliding groove 61.

[0032] Initially, the first pushing piece 4 is disengaged from the sealingly fitted pushing disc part 54, and the first pushing piece 4, the second pushing piece 5, the connecting piece 6, and the stirring blade 7 are all located above. When the stirring and impregnation operation is performed, the material is input into the chamber of the kettle body 1 below the first pushing piece 4, and then the main stirring paddle 2 and the side rotating cylinder 3 are driven to rotate, and the stirring blade 7 rotates with the rotation of the side rotating cylinder 3, and the first pushing piece 4 moves downward under the driving of the main stirring paddle 2 to make the first pushing piece 4 sealingly fit with the pushing disc part 54, and the first pushing piece 4 continues to move downward to push the second pushing piece 5 to move downward, and further drive the connecting piece 6 and the stirring blade 7 to move downward, so that the connecting piece 6 and the stirring blade 7 rotate with the side rotating cylinder 3 and are driven to move downward; due to the fitting of the first pushing piece 4 and the pushing disc part 54, when the first pushing piece 4 and the second pushing piece 5 move downward, the material in the chamber of the kettle body 1 below the first pushing piece 4 can enter the inner cavity of the side rotating cylinder 3 and be sprayed through the upper perforations 32 to the chamber of the kettle body 1 above the first pushing piece 4, and the stirring blade 7 rotates to stir the material entering the chamber of the kettle body 1 above the first pushing piece 4, and the material is sprayed below the main stirring paddle 2 and the side rotating cylinder 3, so that the material enters the chamber of the kettle body 1 above the first pushing piece 4 in a dispersed state, which is more conducive to the uniform mixing of the material and promotes the uniform distribution of the active substance, and in addition, the side rotating cylinder 3 can also serve as a guide for the movement of the first pushing piece 4. When the first pushing piece 4 moves to the lower end, the main stirring paddle 2 and the side rotating cylinder 3 rotate in the opposite direction, the first pushing piece 4 is pushed to move upward to abut against the connecting rod part 532 and further push the connecting piece 6 and the stirring blade 7 to rotate with the side rotating cylinder 3 and be pushed to move upward, the first pushing piece 4 and the pushing disc part 54 are no longer sealingly fitted, and the material in the chamber of the kettle body 1 above the first pushing piece 4 can flow downward through the gap between the first pushing piece 4 and the pushing disc part 54 to the chamber of the kettle body 1 below the first pushing piece 4, and due to the circular truncated columnar structure of the main disc part 542, the material can be radially dropped into the chamber of the kettle body 1 below the first pushing piece 4, which is more conducive to the uniform mixing of the material. Through the above-mentioned reciprocating process, the material is stirred and impregnated.

[0033] The application is applied to a specific method for producing a catalyst for catalytic combustion treatment of steel sintering flue gas CO, which comprises the following steps: a VWMoTi carrier is prepared by using an impregnation method, 10 kg of TiO2 is taken as raw material, an oxalic acid solution of ammonium metavanadate (NH4VO3: C2H2O4: H2O has a molar ratio of 1:2:100) and ammonium metatungstate and ammonium molybdate are added at a temperature of 30 °C, the mass ratio of V2O5: WO3: MoO3: TiO2 in the final product catalyst is controlled to be 0.01: 0.02: 0.04: 1, then 40 L of deionized water is added, stirring and impregnation is carried out for 3 h, spray drying treatment is carried out, then calcination is carried out at a temperature of 500 °C to obtain the VWMoTi carrier, and the VWMoTi is ground into a powder with a particle size of 80-200 mesh by using a grinding machine. At a temperature of 30 °C, 5000 ml of a chloroplatinic acid solution containing Pt with a content of 0.001 g / ml and 5000 ml of a palladium chloride solution containing Pd with a content of 0.001 g / ml are added to the VWMoTi powder, then 40 L of deionized water is added, stirring and impregnation is carried out for 3 h, spray drying treatment is carried out, the powder sample after spray drying is calcined in a kiln at a temperature of 500 °C to obtain a PtPd / VWMoTi catalyst powder, then the powder is ground into a powder with a particle size of 80-200 mesh. The PtPd / VWMoTi catalyst powder and a binder are added to a small mixing machine for mud mixing (the binder is carboxymethyl cellulose, and the mass ratio of the binder to the PtPd / VWMoTi catalyst powder is 0.001: 1), then the mixed mud is aged for 24 hours, and is input into a mud filter for filtration; the filtered mud is extruded under an extrusion pressure of 3.5 MPa to obtain a honeycomb type catalyst mud with a length of 300 mm and a 3×3 hole; then the mud is dried at 80 °C for 120 hours, so that the water content of the formed mud is less than 5%, then the mud is placed in a kiln at a temperature of 500 °C for calcination for 4 hours to obtain a formed honeycomb catalyst.

[0034] Catalyst activity test: The activity experiment is carried out on a fixed bed reactor, the catalyst is 300 mm long and has a 3×3 hole. The initial gas concentration is: [CO]=5000 ppm, [SO2]=30 ppm, [O2]=10 vol%, [H2O]=10 vol%, N2 is a carrier gas, GHSV (volume hourly space velocity) = 8000 h -1 The CO conversion efficiency of the catalyst is 99.9% at 300 °C, and 99.9% of CO2 is produced. The CO conversion efficiency of the catalyst is 99.8% at 250 °C, and 99.8% of CO2 is produced. In a 24-hour stability test at 250 °C, the activity decreases to 98.2%, and the activity can basically remain stable.

[0035] The catalyst was prepared according to the method of the above example and using a conventional single direction stirring impregnation apparatus. It was found that the CO conversion efficiency of the catalyst obtained was decreased by 5.4% at 250 °C, and the catalytic activity was decreased by 3.55% respectively in the 24 hours stability test at 250 °C.

[0036] The above description is merely the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A kind of production steel sintering flue gas CO catalytic combustion treatment catalyst stirring impregnation device, including kettle body (1) and respectively in kettle body (1) Main stirring paddle (2), multiple side rotating drum (3), first push piece (4), second push piece (5), multiple connecting pieces (6), multiple stirring blade (7), it is characterized in that, A plurality of said side rotating drums (3) are circumferentially distributed outside the main stirring paddle (2), the main stirring paddle (2) and the side rotating drum (3) are both provided with forward and reverse rotation, the upper part and the lower part of the side rotating drum (3) are respectively communicated with the inner cavity of the kettle body (1), each said side rotating drum (3) is sleeved with a connecting piece (6) which is circumferentially limited and connected and is connected in sliding mode, a plurality of stirring blades (7) are fixed on the upper part of the connecting piece (6) in one-to-one correspondence, the first pushing piece (4) is screwed on the main stirring paddle (2), and a plurality of connecting pieces (6) pass through the first pushing piece (4) and are circumferentially slidably sleeved with the first pushing piece (4), the first pushing piece (4) is connected in sliding mode with the inner wall of the kettle body (1), the second pushing piece (5) comprises a plurality of connecting parts (53) and a plurality of pushing disc parts (54), the second pushing piece (5) is connected in sliding mode with the connecting piece (6) through the connecting part (53) and is connected in limiting mode in upward and downward directions, the first pushing piece (4) is abutted upward to the connecting part (53), the pushing disc part (54) passes through the first pushing piece (4) and is spaced from the first pushing piece (4); the upper part and the lower part of the side rotating drum (3) are respectively provided with circumferentially distributed perforations (32), the first pushing piece (4) drives the stirring blade (7) to move in the area between the upper perforation (32) and the lower perforation (32); When the main stirring paddle (2) rotates, the first pushing piece (4) moves downward under the driving of the main stirring paddle (2); when the first pushing piece (4) moves downward, the first pushing piece (4) is sealingly embedded with the pushing disc part (54) and can drive the second pushing piece (5) to move downward, thereby driving the connecting piece (6) and the stirring blade (7) to move downward while rotating with the side rotating drum (3); after the first pushing piece (4) moves downward and moves upward, the first pushing piece (4) moves upward to abut the connecting part (53) and is disengaged from the sealing embedding with the pushing disc part (54), and the first pushing piece (4) drives the second pushing piece (5) to move upward and drives the connecting piece (6) and the stirring blade (7) to move upward while rotating with the side rotating drum (3).

2. The agitator immersion device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst according to claim 1, characterized by, The second pushing piece (5) further comprises an annular inner ring (51) and an annular outer ring (52) which are distributed in the inner and outer circles, a plurality of pushing disc parts (54) are distributed in the inner and outer circles and are respectively connected to the inner ring (51) and the outer ring (52), and a plurality of connecting parts (53) are circumferentially distributed and connected to the inner ring (51) and the outer ring (52).

3. The agitator immersion device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst according to claim 2, characterized by, The upper part of the connecting piece (6) is provided with a circular annular sliding groove (61), the connecting part (53) comprises a circular annular sleeve ring part (531), and the sleeve ring part (531) is circumferentially slidably embedded with the sliding groove (61).

4. The agitator immersion device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst according to claim 3, characterized by, The connecting part (53) further comprises a connecting rod part (532) connected to the outer walls on both sides of the sleeve ring part (531), the inner side connecting rod part (532) is connected to the inner ring (51), and the outer side connecting rod part (532) is connected to the outer ring (52), and the first pushing piece (4) is abutted upward to the connecting rod part (532).

5. The agitator immersion device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst according to claim 2, characterized by, A plurality of through holes (41) are formed on the first pushing piece (4), the through holes (41) are in the shape of a circular truncated cone with the upper part small and the lower part large, the pushing disc part (54) comprises a main disc part (542) in the shape of a circular truncated cone, and the main disc part (542) is sealingly embedded with the through hole (41).

6. The agitator impregnation device for producing a steel sintering flue gas CO catalytic combustion treatment catalyst according to claim 5, characterized by, The pushing disc part (54) further comprises a connecting column (541) connected to the main disc part (542) in an up-down manner, and the connecting column (541) is correspondingly connected to the inner ring (51) and the outer ring (52).

7. The agitator immersion device for manufacturing a steel sintering flue gas CO catalytic combustion treatment catalyst according to claim 1, wherein The plurality of side rotating drums (3) are in driving connection with the main stirring paddle (2).

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