Denitration catalyst extrusion molding equipment

Abstract

The invention relates to denitration catalyst extrusion molding equipment which comprises a screw extruder and a flow guide molding mechanism, the flow guide molding mechanism is arranged at a discharge port of the screw extruder, and after the screw extruder spirally conveys internally mixed raw materials to the flow guide molding mechanism, the flow guide molding mechanism shapes the raw materials into a set honeycomb shape. The problem that fluid forming is blocked in a traditional scheme is solved by arranging the flow guide forming mechanism, low-cost adjustment of different hole numbers under the same mesh number can be achieved through the flow guide forming mechanism, production and machining are more flexible, and the requirement for market diversification can be met.

Description

Technical Field

[0001] The invention belongs to the field of denitration catalyst preparation, and specifically refers to a denitration catalyst extrusion molding equipment. Background Art

[0002] Denitrification catalyst can reduce the nitrogen oxides produced during combustion. Its base material is mainly ceramic raw materials, which are widely used in thermal power plants, steel smelting, petrochemical industry, cement production and other industrial fields. Denitrification catalyst can be divided into three types: plate type, honeycomb type and corrugated plate type. Among them, honeycomb type denitrification catalyst is more widely used.

[0003] The production process of honeycomb denitrification catalyst mainly includes mixing, aging, extrusion, cutting, drying and assembly. Extrusion is a process to shape the raw materials into a honeycomb shape. The extrusion quality is closely related to the subsequent performance. Honeycomb molding is mainly achieved by screw extruders with shaping molds.

[0004] At present, honeycomb forming molds in the industry all adopt the same idea. For example, the Chinese patents with authorization announcement numbers CN205835623U and CN108698252B all adopt the same idea. They are all achieved by arranging the forming mold rod cores in an array, and then staggered holes are opened between the gaps at the roots of the forming mold rod cores. The fluid raw materials flow out from the staggered holes and are then extruded from between the forming mold rod cores.

[0005] In the molding process of this type of solution, because the fluid flow direction is completely perpendicular to the cross section of the mold, when the fluid raw material encounters the mold, the raw material will be subject to obvious resistance and reaction force, which is not conducive to product molding. When there is obvious fluctuation at the feed end, the molding part will be greatly affected, causing pits and uneven defects on the surface of the honeycomb holes. Defects will cause the product to be intolerant to dust erosion and have a short life cycle. At the same time, the extrusion die of the above patent solution can only achieve the production of the same mesh number and fixed side length, and cannot achieve the production of the same mesh number and different side lengths, which has great production limitations. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a denitration catalyst extrusion molding equipment, which at least partially solves the above problems.

[0007] The technical solution adopted by the present invention is as follows: A denitration catalyst extrusion molding equipment proposed in the present invention includes a screw extruder and a flow-guiding molding mechanism, wherein the flow-guiding molding mechanism is arranged at the discharge port of the screw extruder, and after the screw extruder spirally conveys the kneaded raw materials to the flow-guiding molding mechanism, the flow-guiding molding mechanism shapes the raw materials into a set honeycomb shape.

[0008] Furthermore, the diversion molding mechanism includes a transition tank, a diversion tank, a front diversion cone, a rear diversion cone and a shaping pipe, the transition tank is arranged at the discharge port of the screw extruder, the diversion tank is arranged on the side of the transition tank away from the screw extruder, and the shaping pipe is arranged on the side of the diversion tank away from the transition tank.

[0009] Furthermore, a necking tube is provided at the tail of the shaping tube, and the shaping tube and the guide tank are detachable.

[0010] Furthermore, the front guide cone is arranged on the side of the center of the guide tank facing the transition tank, and the rear guide cone is arranged on the side of the center of the guide tank facing the shaping pipe, and the tips of the front guide cone and the rear guide cone point in opposite directions.

[0011] Furthermore, a heating core rod is arranged in an array on the rear guide cone, and a shaping joint is connected to the heating core rod, and the shaping joint and the heating core rod are detachably mounted.

[0012] Furthermore, a central fixing plate is provided at the center of the guide tank on one side close to the transition tank, and the central fixing plate and the guide tank are detachable.

[0013] Furthermore, the opening side of the front guide cone is arranged on a side of the central fixed disk close to the screw extruder, and the opening side of the rear guide cone is arranged on a side of the central fixed disk close to the shaping tube.

[0014] Furthermore, the central fixing plate is provided with a cable hole penetrating the shell of the guide tank, and an array of fixing holes is provided on one side of the central fixing plate facing the shaping tube.

[0015] Furthermore, the conical surface of the rear guide cone is provided with through holes in an array, the projection of the through holes completely coincides with the fixing holes, and the heating core rod is installed on the fixing holes through the through holes.

[0016] Furthermore, the shaping joint comprises a sleeve and a variable rod, the sleeve is sleeved on the top end of the heating core rod, and the variable rod is arranged on the sleeve.

[0017] Furthermore, the gap between the necked tube and the heating core rod is less than one tenth of the length of the variable rod on the shaping joint.

[0018] The beneficial effects achieved by the present invention are as follows: 1. The present invention uses a combination of a front guide cone and a rear guide cone to enable the raw material fluid to flow smoothly to the root of the heating mandrel without being subject to large mold resistance, which is more conducive to reducing defects on the surface of the honeycomb holes; 2. The shaping joint and the heating mandrel are detachably connected. When the side length of the honeycomb hole needs to be adjusted, the shaping joint is disassembled to the required number, and the shaping tube of the corresponding size is replaced. This can achieve the adjustment of different side lengths under the same mesh number. The adjustment cost is low and there is no need to replace the overall mold; 3. By heating the heating core rod and the shaping joint through the built-in cable hole, the forming raw materials can be pre-dried, the surface hardness of the formed honeycomb body can be improved, and it is easy to transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 It is an exploded view of the induction molding mechanism; Figure 3 is a cross-sectional view of the flow-guiding molding mechanism; Figure 4 The diagram is a positional relationship diagram of the guide tank, the front guide cone, the rear guide cone and the shaping pipe; Figure 5 It is a schematic diagram of the position structure of the rear guide cone, the heating core rod and the shaping joint; Figure 6 A partial cross-section of the diversion tank Figure 1 ; Figure 7 A partial cross-section of the diversion tank Figure 1 ; Figure 8 It is a structural schematic diagram of a shaped joint; Fig. 9 Schematic diagram of the structure of the rear guide cone.

[0020] Among them, 1. screw extruder, 2. diversion molding mechanism, 3. transition tank, 4. diversion tank, 5. front diversion cone, 6. rear diversion cone, 7. shaping tube, 8. heating core rod, 9. shaping joint, 10. necking tube, 11. central fixing plate, 12. cable hole, 13. fixing hole, 14. sleeve, 15. variable rod, 16. perforation.

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0024] like Figure 1 As shown, a denitration catalyst extrusion molding device proposed in the present invention includes a screw extruder 1 and a flow-guiding molding mechanism 2. The flow-guiding molding mechanism 2 is arranged at the discharge port of the screw extruder 1. After the screw extruder 1 spirally conveys the kneaded raw materials to the flow-guiding molding mechanism 2, the flow-guiding molding mechanism 2 shapes the raw materials into a set honeycomb shape.

[0025] like Figure 2-Figure 5 As shown, the diversion molding mechanism 2 includes a transition tank 3, a diversion tank 4, a front diversion cone 5, a rear diversion cone 6 and a shaping tube 7. The transition tank 3 is arranged at the discharge port of the screw extruder 1, the diversion tank 4 is arranged on the side of the transition tank 3 away from the screw extruder 1, and the shaping tube 7 is arranged on the side of the diversion tank 4 away from the transition tank 3.

[0026] The tail of the shaping tube 7 is provided with a necking tube 10, the size of which is adapted to the size of the honeycomb catalyst to be formed. The shaping tube 7 and the guide tank 4 are detachable, and the corresponding shaping tube 7 can be replaced according to the side length requirement of the required honeycomb catalyst without replacing the entire mold.

[0027] The front guide cone 5 is arranged on the side of the center of the guide tank 4 facing the transition tank 3, and the rear guide cone 6 is arranged on the side of the center of the guide tank 4 facing the shaping pipe 7, and the tips of the front guide cone 5 and the rear guide cone 6 point in opposite directions.

[0028] A heating core rod 8 is arranged in an array on the rear guide cone 6, and a shaping joint 9 is connected to the heating core rod 8. The shaping joint 9 and the heating core rod 8 can be detachably installed. The end of the heating core rod 8 after detachment can be equipped with an end cover for protection to prevent the fluid raw material from contaminating the end of the heating core rod 8. After the heating core rod 8 is energized, the shaping joint 9 can be heated, and the wall layer of the formed honeycomb deoxidation catalyst is in the form of a thin sheet. The heated shaping joint 9 can perform a better pre-drying treatment on the deoxidation catalyst, and the evaporated water vapor will be discharged outward from the honeycomb hole. The pre-dried honeycomb catalyst has better hardness, which is more conducive to subsequent transportation, and can prevent surface pits from collision during transportation, affecting the appearance quality.

[0029] like Figure 4 , Figure 6 and Figure 7As shown, a central fixed disk 11 is provided at the center of the guide tank 4 near the transition tank 3. The central fixed disk 11 and the guide tank 4 are detachable, so that the central fixed disk 11 of different specifications can be replaced according to needs. The opening side of the front guide cone 5 is provided on the side of the central fixed disk 11 near the screw extruder 1, and the opening side of the rear guide cone 6 is provided on the side of the central fixed disk 11 near the molding tube 7. The central fixed disk 11 is provided with a cable hole 12 that passes through the shell of the guide tank 4, and an array of fixing holes 13 is provided on the side of the central fixed disk 11 facing the molding tube 7.

[0030] like Figure 3 , Figure 5 and Fig. 9 As shown, an array of through holes 16 are provided on the conical surface of the rear guide cone 6, and the projection of the through holes 16 completely coincides with the fixing hole 13. The heating core rod 8 is installed on the fixing hole 13 through the through holes 16. The heating harness is connected to the heating core rod 8 in the fixing hole 13 through the cable hole 12, so that the heating core rod 8 is energized and finally the forming joint 9 on the heating core rod 8 is heated. The harness is not shown in the accompanying drawings.

[0031] like Figure 5 and Figure 8 As shown, the shaping joint 9 includes a sleeve 14 and a variable rod 15. The sleeve 14 is sleeved on the top of the heating core rod 8, and the variable rod 15 is arranged on the sleeve 14. In order to facilitate the connection with the heating core rod 8, the size of the sleeve 14 remains fixed, and the cross-sectional shape and size of the variable rod 15 are changed as needed. When it is necessary to make honeycomb catalysts with different pore shapes at the same mesh number, the corresponding variable rod 15 can be replaced; at the same time, in order to facilitate the molding adjustment of honeycomb catalysts with different side lengths at the same mesh number, only the shaping tube 7 needs to be replaced, and the overall mold does not need to be replaced, so as to achieve cost reduction and efficiency improvement. The gap between the necking tube 10 and the heating core rod 8 is less than one tenth of the length of the variable rod 15 on the shaping joint 9.

[0032] When in use, appropriate rear guide cone 6 and shaping tube 7 are selected according to the mesh number and side length of the denitrified catalyst to be produced. The mesh number of the rear guide cone 6 is consistent with the mesh number required by the product, and the outline size of the necking tube 10 on the shaping tube 7 is adapted to the side length of the denitrified catalyst.

[0033] After the selection is completed, the heating core rod 8 is installed in the fixing hole 13. The number of the heating core rods 8 is the same as the number of the fixing holes 13. Then the rear guide cone 6 is installed on the inner side of the central fixed disk 11. At this time, the heating core rod 8 will pass through the through hole 16 on the rear guide cone 6. Then the front guide cone 5 is installed on the outer side of the central fixed disk 11. Then the guide tank 4 and the transition tank 3 are tightened. Finally, the transition tank 3 is fixed on the screw extruder 1. After the installation is completed, the wiring harness in the cable hole 12 (not shown in the drawing) is connected to the heating core rod 8.

[0034] Then, the shaping joint 9 is fixed to the top end of the heating core rod 8. The number of shaping joints 9 is the same as the total number of holes of the denitrification catalyst (when a large number of shaping joints 9 are installed, they can be uniformly positioned and installed through tooling. This is a mature solution and will not be described in detail here). The shaping joints 9 are equidistantly arranged according to the contour of the denitrification catalyst. At this time, the selected shaping pipe 7 is fixed to the end of the diversion tank 4 away from the transition tank 3. The necking pipe 10 on the shaping pipe 7 is sleeved on the outer periphery of the shaping joint 9, and the shaping joints 9 are equidistantly distributed in an array in the necking pipe 10.

[0035] After the diversion molding mechanism 2 is fully installed, the screw extruder 1 is started, and the catalyst raw material is added into the screw extruder 1. The raw material becomes a fluid paste after mixing. After the fluid enters the transition tank 3, it enters the diversion tank 4 along the outer conical surfaces of the front guide cone 5 and the rear guide cone 6. Driven by the fluid pressure, it will smoothly flow along the conical surface of the rear guide cone 6 into the heating core rods 8 arranged in the array and fill the gaps between the heating core rods 8.

[0036] The fluid continues to move, and when it reaches the forming tube 7, the end of the heating core rod 8 without the forming joint 9 is blocked by the forming tube 7, and the fluid gradually gathers toward the necking tube 10, and finally fills the gap of the forming joint 9, forming a de-catalyst that meets the set mesh number and side length.

[0037] During the movement of the fluid, the wiring harness in the cable hole 12 is connected, and the forming joint 9 is heated by the heating core rod 8, so that the catalyst between the forming joints 9 is heated and baked to evaporate the moisture in the catalyst. The evaporated water vapor will be discharged from the honeycomb. The moisture content inside the preheated catalyst is low, and the overall strength is preliminarily improved. It is not easy to be deformed and damaged during subsequent cutting and transportation.

[0038] When the catalyst is discharged from the shaping tube 7, the required honeycomb deoxidized catalyst is obtained; if catalysts with the same mesh size and different side lengths need to be processed, the shaping tube 7 can be directly replaced. The height and width of the replaced shaping tube 7 must be compatible with the height and width of the catalyst to be processed, and the number of shaping joints 9 must be increased or decreased accordingly.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A denitration catalyst extrusion molding equipment, characterized in that: include, A screw extruder (1) comprising a discharge port; The flow guiding and forming mechanism (2) is arranged at the discharge port of the screw extruder (1), and comprises a transition tank (3), a flow guiding tank (4), a front flow guiding cone (5), a rear flow guiding cone (6) and a shaping tube (7), wherein the transition tank (3) is arranged at the discharge port of the screw extruder (1), the flow guiding tank (4) is arranged on a side of the transition tank (3) away from the screw extruder (1), the shaping tube (7) is arranged on a side of the flow guiding tank (4) away from the transition tank (3), the front flow guiding cone (5) is arranged on a side of the center of the flow guiding tank (4) facing the transition tank (3), the rear flow guiding cone (6) is arranged on a side of the center of the flow guiding tank (4) facing the shaping tube (7), and a heating core rod (8) is arranged in an array on the rear flow guiding cone (6), and a shaping joint (9) is connected to the heating core rod (8).

2. The denitration catalyst extrusion molding equipment according to claim 1, characterized in that: The tail of the shaping tube (7) is provided with a necking tube (10).

3. The denitration catalyst extrusion molding equipment according to claim 2, characterized in that: The shaping joint (9) comprises a sleeve (14) and a variable rod (15); the sleeve (14) is sleeved on the top end of the heating core rod (8); and the variable rod (15) is arranged on the sleeve (14).

4. The denitration catalyst extrusion molding equipment according to claim 3, characterized in that: The gap between the necking tube (10) and the heating core rod (8) is less than one tenth of the length of the variable rod (15) on the shaping joint (9).

5. The denitration catalyst extrusion molding equipment according to claim 1, characterized in that: A central fixing plate (11) is provided at the center of the guide tank (4) on a side close to the transition tank (3).

6. The denitration catalyst extrusion molding equipment according to claim 5, characterized in that: The central fixing plate (11) is provided with a cable hole (12) penetrating the shell of the guide tank (4), and a side of the central fixing plate (11) facing the shaping tube (7) is provided with an array of fixing holes (13).

7. The denitration catalyst extrusion molding equipment according to claim 6, characterized in that: The cone surface of the rear guide cone (6) is provided with perforations (16) in an array, and the projections of the perforations (16) completely overlap with the fixing holes (13).

8. The denitration catalyst extrusion molding equipment according to claim 7, characterized in that: The opening side of the front guide cone (5) is arranged on a side of the central fixed disk (11) close to the screw extruder (1), and the opening side of the rear guide cone (6) is arranged on a side of the central fixed disk (11) close to the shaping tube (7).

9. The denitration catalyst extrusion molding equipment according to claim 1, characterized in that: The tips of the front guide cone (5) and the rear guide cone (6) point in opposite directions.

10. The denitration catalyst extrusion molding equipment according to claim 7, characterized in that: The heating core rod (8) is installed on the fixing hole (13) through the through hole (16).

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