Melt extrusion device and sewage denitrification carrier preparation system

Abstract

The utility model provides a melt extrusion device and a sewage denitrification carrier preparation system, and the device comprises a screw conveying part which is provided with an extrusion barrel and double screws; the screw driving part is connected with one ends of the double screws; the temperature control part is arranged on the periphery of the extrusion barrel; the heating module provides heat energy for the temperature control part; the controller is connected with the screw driving part, the temperature control part and the heating module; wherein the temperature control part is provided with a plurality of temperature control sections. The system comprises a powder mixing device, a first feeding device, a melt extrusion device, a cooling cutting device and a screening device which are arranged in sequence, and a second feeding device which is connected below the screening device and above the first feeding device. The device and the system are suitable for preparing the sulfur autotrophic nitrogen removal carrier, heating and mixing are carried out in the screw conveying process, heating and melting of sulfur are achieved by controlling the temperature, then direct extrusion molding is carried out, the preparation technology is simple, continuous production can be achieved, and the device and the system are suitable for large, medium and small scale production.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater denitrification carrier preparation, and specifically relates to a melt extrusion device and a wastewater denitrification carrier preparation system. Background Art

[0002] At present, sulfur autotrophic denitrification technology is widely used and mature in sewage denitrification treatment. Sulfur autotrophic denitrification is an autotrophic denitrification technology that uses elemental sulfur as an electron donor to reduce nitrate and nitrite to nitrogen. However, the use of elemental sulfur has problems such as sulfur being fragile, difficult to backwash, and acidification of effluent. Therefore, composite sulfur autotrophic denitrification carriers containing sulfur and other materials are usually used on the market.

[0003] The existing preparation process of sulfur autotrophic denitrification carrier mostly adopts wet underwater granulation method: first mix the raw materials and then add them into the melting tank for heating and melting, or melt the sulfur first and then add other auxiliary materials into the molten sulfur for stirring and mixing, and then flow into the distributor, and drip into the water cooling device below by the gravity of the material itself, forming spherical particles that sink to the bottom of the water, and finally drain the water and sieve to obtain the sulfur autotrophic composite carrier. The equipment of this preparation process is relatively complex, with large volume, wide area, complex preparation process, high energy consumption, intermittent production, low production efficiency, and unsuitable for small and medium-sized scale production. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned prior art, the purpose of the utility model is to provide a melt extrusion device and a sewage denitrification carrier preparation system. The device and system are suitable for the preparation of sulfur autotrophic denitrification carriers. Heating and mixing are carried out during screw conveying, and the sulfur is heated and melted by controlling the temperature, and then directly extruded and formed. The preparation process is simple, continuous production can be realized, and it is suitable for large, medium and small scale production.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A melt extrusion device, comprising:

[0007] A screw conveying part, comprising an extrusion barrel and a twin screw disposed in the extrusion barrel;

[0008] A screw driving unit connected to one end of the twin screws to drive the twin screws to operate;

[0009] A temperature control unit is disposed on the outer periphery of the extrusion barrel to control the temperature of the extrusion barrel;

[0010] A heating module, providing heat energy to the temperature control part;

[0011] A controller connected to the screw drive unit, the temperature control unit, and the heating module;

[0012] Wherein, the temperature control part is provided with a plurality of temperature control sections in sequence along the conveying direction of the extrusion barrel, and each of the temperature control sections is temperature controlled and heated respectively.

[0013] In one embodiment of the present application, the temperature control unit includes 5 to 10 temperature control sections.

[0014] In one embodiment of the present application, a natural exhaust port is provided in the middle of the extrusion barrel, and a vacuum exhaust port is provided at the rear end, and the vacuum exhaust port is connected to a vacuum pump via a pipeline.

[0015] In one embodiment of the present application, a detachable extrusion head is provided at the rear end of the extrusion barrel.

[0016] In one embodiment of the present application, the heating module is a resistance heater or an induction heater, which is respectively arranged in each of the temperature control sections;

[0017] Alternatively, the heating module is a thermal oil heater, which is connected to each of the temperature control sections via pipelines.

[0018] In one embodiment of the present application, it also includes a water cooling circulation module connected to the controller, and the water cooling circulation module is respectively connected to each of the temperature control sections.

[0019] In one embodiment of the present application, a temperature probe is provided in each of the temperature control sections, and the temperature probe is connected to the controller.

[0020] A sewage denitrification carrier preparation system, comprising:

[0021] A melt extrusion device as described in any one of the above items;

[0022] A powder mixing device is arranged before the melt extrusion device;

[0023] A first feeding device, connecting the discharge port of the powder mixing device and the feed port of the melt extrusion device;

[0024] A cooling and cutting device, arranged after the melt extrusion device, for cooling and cutting the extruded material;

[0025] A screening device, arranged after the cooling and cutting device, for screening;

[0026] The second feeding device is connected to the undersize material of the screening device and the first feeding device, and recovers the undersize material to the first feeding device.

[0027] In one embodiment of the present application, a crusher is further included. The crusher is arranged between the cooling and cutting device and the screening device to crush the coarse carrier formed by cooling and cutting.

[0028] In one embodiment of the present application, the cooling and cutting device includes a cooling water tank, an air dryer and a pelletizer.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] 1. The melt extrusion device of the utility model is provided with a temperature control part outside the extrusion barrel of the screw conveying part. The temperature control part is divided into a plurality of temperature control sections, and temperature control and heating are performed separately, so that the material can be conveyed and mixed while being accurately heated and melted. It is suitable for the preparation of sulfur autotrophic denitrification carriers, can effectively simplify the process, realize continuous production, and is suitable for production needs of different scales, especially for small and medium-sized production.

[0031] 2. The wastewater denitrification carrier preparation system of the utility model has simple equipment and eliminates the liquid sulfur insulation system, liquid sulfur insulation conveying system and melting tank at the front end of the traditional process equipment, which greatly simplifies the preparation process. The temperature control part realizes segmented temperature control heating and melting in the pushing and mixing process. The temperature control is accurate and the sulfur can be melted to a viscous state in a very short time (1-2 minutes) (the traditional process uses a melting tank that takes about 1-2 hours to completely melt). The mechanical propulsion extrusion mode is used instead of the traditional melting tank stirring and gravity dripping mode. While streamlining the stirring device, the extrusion speed can be accurately controlled, which can effectively avoid the problem of uncontrollable extrusion speed during gravity dripping, and can realize continuous production. Compared with traditional intermittent production, it can greatly improve production efficiency. In addition, the preparation system generates less waste, which can be directly recycled, and the morphology and particle size of the extruded product are more controllable and uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the structure of the melt extrusion device in this application.

[0034] Figure 2 This is a schematic diagram of the structure of the wastewater denitrification carrier preparation system in this application.

[0035] Reference numerals:

[0036] 1. Powder mixing device;

[0037] 2. The first feeding device;

[0038] 3. Melt extrusion device; 31. Extrusion barrel; 311. Natural exhaust port; 312. Vacuum exhaust port; 32. Twin screw; 33. Screw drive unit; 34. Temperature control unit; 341. Temperature control section; 35. Extrusion head;

[0039] 4. Cooling and cutting device; 41. Cooling water tank; 42. Air dryer; 43. Pelletizer;

[0040] 5. Screening device;

[0041] 6. Second feeding device;

[0042] 7. Crusher. DETAILED DESCRIPTION

[0043] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0044] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inside", "outside", "axial", "peripheral", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships conventionally placed when the product of the present invention is used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0049] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0050] like Figure 1 As shown, an embodiment of the utility model provides a melt extrusion device, which includes a screw conveying part, a screw driving part 33, a temperature control part 34, a heating module (not shown in the figure) and a controller (not shown in the figure).

[0051] The screw conveying part includes an extrusion barrel 31 and a twin screw 32 arranged in the extrusion barrel 31 and arranged along the axial direction of the extrusion barrel 31. The front end of the screw conveying part is provided with a feed port, and the rear end is an extrusion port. A hopper can be provided at the feed port. The screw conveying part is used to convey and mix materials.

[0052] The screw drive unit 33 is disposed at one end of the screw conveying unit package near the feed port, connected to one end of the twin screws 32, and drives the twin screws 32 to operate, thereby driving material conveying and mixing. The screw drive unit 33 may include a drive motor and a reduction box.

[0053] The temperature control unit 34 is disposed on the outer periphery of the extrusion cylinder 31 and is used to control the temperature inside the extrusion cylinder 31 .

[0054] The heating module is connected to the temperature control part 34 to provide heat energy to the temperature control part 34 .

[0055] The controller is connected with the screw driving part 33, the temperature control part 34 and the heating module, etc., to realize automatic control of the melt extrusion device.

[0056] Specifically, the temperature control part 34 is sequentially arranged in a plurality of temperature control sections 341 along the conveying direction of the extrusion barrel 31. Preferably, each temperature control section 341 has the same size, and each temperature control section 341 performs temperature control and heating separately to ensure that the material at each part of the extrusion barrel 31 is heated to the required temperature.

[0057] Preferably, the temperature control section 34 includes 5 to 10 temperature control sections 341, and more preferably, the temperature control section 34 includes 7 to 10 temperature control sections 341. When used for the preparation of sulfur-containing carriers such as sulfur autotrophic denitrification carriers, the temperature of the temperature control section 34 is usually set in the range of 145 to 170°C. Setting the temperature control section 34 to 5 to 10 temperature control sections 341 can achieve better temperature distribution and control.

[0058] In one embodiment, a natural exhaust port 311 is provided in the middle of the extrusion barrel 31, and a vacuum exhaust port 312 is provided at the rear end. The natural exhaust port 311 is used for natural emptying, and the vacuum exhaust port 312 is connected to a vacuum pump via a hose pipeline for vacuum exhaust. The natural exhaust port 312 can be provided to timely discharge most of the air that enters the extrusion barrel 31 with the material, so that the material can fill the extrusion barrel 31, avoid the generation of bubbles, better mix and transport, and ensure the continuity of production and the uniformity of the product; the vacuum exhaust port 312 is provided at the rear end, and the air in the body of the extrusion barrel 31 close to the extrusion head is extracted by negative pressure, ensuring that the final extruded material has no bubbles, has a denser texture, and meets the requirements of rapid extrusion preparation.

[0059] An extrusion head 35 is disposed at the rear end of the extrusion barrel 31, and preferably the extrusion head 35 is detachably mounted at the extrusion port of the extrusion barrel 31. The melt extrusion device is equipped with extrusion heads 35 of various sizes and shapes to facilitate application of different technical requirements.

[0060] In one embodiment, the heating module (not shown) is a resistance heater or an induction heater, which is respectively arranged in each temperature control section 341 and connected to a controller, and the controller controls the heating of each temperature control section 341 and the corresponding extrusion barrel 31.

[0061] In another embodiment, the heating module is a thermal oil heater, which is connected to the heating chamber or heating pipe of each temperature control section 341 through a circulation pipeline, and thermal oil is pumped into each temperature control section 341 for heating.

[0062] Preferably, a water cooling circulation module is also provided, which is connected to the controller and is also connected to the cooling pipe of each temperature control section 341 through a circulation pipeline. When the temperature in the temperature control section 341 is higher than the set temperature, the controller controls the water cooling circulation module to cool down the temperature control section 341 to ensure that the temperature is maintained within the set temperature range, thereby achieving precise temperature control.

[0063] Each control section 341 is provided with a temperature probe, which is connected to the controller and associated with the heating module and the water cooling circulation module, so as to better monitor and control the temperature of each temperature control section 341 .

[0064] In summary, the melt extrusion device 3 is provided with a temperature control part 34 outside the extrusion barrel 31 of the screw conveying part. The temperature control part 34 is divided into a plurality of temperature control sections 341, and temperature control and heating are performed separately, so that the material can be conveyed and mixed while achieving precise heating and melting. It is suitable for the preparation of sulfur autotrophic denitrification carriers, can effectively simplify the process, realize continuous production, and is suitable for production needs of different scales, especially for small and medium-sized production.

[0065] Based on the same purpose of the invention, the embodiment of the utility model also provides a sewage denitrification carrier preparation system for preparing sulfur-containing carriers such as sulfur autotrophic denitrification carriers.

[0066] like Figure 2 As shown, the sewage denitrification carrier preparation system includes the melt extrusion device 3 mentioned above, as well as a powder mixing device 1, a first feeding device 2, a cooling and cutting device 4, a screening device 5 and a second feeding device 6, etc.

[0067] The powder material mixing device 1 may include a raw material adding mechanism and a stirring and mixing mechanism, which are used to mix the raw materials uniformly according to the proportions to achieve rough mixing of the materials. The powder material mixing device 1 is arranged before the melt extrusion device 3 .

[0068] The first feeding device 2 is located between the powder mixing device 1 and the melt extrusion device 3, and can be a screw conveyor or a belt conveyor. The first feeding device 2 connects the discharge port of the powder mixing device 1 and the feed port of the melt extrusion device 3, and continuously conveys the roughly mixed materials to the powder mixing device 1 for heating, melting, mixing and extrusion.

[0069] The cooling and cutting device 4 is arranged after the melt extrusion device 3, and is used to cool and cut the extruded material. The cooling and cutting device 4 may include a cooling water tank 41, an air dryer 42 and a pelletizer 43 arranged in sequence. The extruded material is quickly cooled by water, and then quickly dried by the air dryer before cutting and forming. The production is continuous and fast, and the particle size of the obtained carrier particles is uniform. The air dryer may include a drying chamber, a conveyor belt, a blower and an exhaust collector.

[0070] The screening device 5 comprises a vibrating screen, which is arranged after the cooling and cutting device 4 and is used for screening and separating the coarse carrier after cutting to obtain the carrier product on the screen.

[0071] The second feeding device 6 can be a screw conveyor or a belt conveyor, which is connected to the under-screen of the screening device 5 and the top of the first feeding device 2, and recovers the materials (crushed materials, waste materials) screened by the screening device 5 to the top of the first feeding device 2 for direct recycling.

[0072] In one embodiment, the sewage denitrification carrier preparation system further includes a crusher 7, which is arranged between the cooling and cutting device 4 and the screening device 5, and is used to perform a certain degree of crushing treatment on the coarse carrier formed by cooling and cutting, and then screen it. The crusher 7 can be set to crush the carrier after cutting and forming, increase the roughness of the carrier surface, obtain carrier particles with a larger specific surface area, and make the obtained carrier morphology more irregular, which is conducive to filling and obtaining a high-density filler layer.

[0073] In summary, the sewage denitrification carrier preparation system is simple in equipment, eliminating the liquid sulfur insulation system, liquid sulfur insulation transportation system and melting tank at the front end of the traditional process equipment, greatly simplifying the preparation process, and realizing segmented temperature control heating and melting in the pushing and mixing process through the temperature control unit 34, the temperature control is precise, and the sulfur can be melted to a viscous state in a very short time (1~2min) (the traditional process uses a melting tank that takes about 1~2h to completely melt); a mechanical propulsion extrusion mode is used instead of the traditional melting tank stirring and gravity dripping mode, while streamlining the stirring device, the extrusion speed can be accurately controlled, and the problem of uncontrollable extrusion speed during gravity dripping can be effectively avoided, and continuous production can be realized. Compared with traditional intermittent production, it can greatly improve production efficiency; and the preparation system generates less waste, which can be directly recycled, and the morphology and particle size of the extruded product are more controllable and uniform.

Claims

1. A melt extrusion device, characterized in that: include: A screw conveying section comprising an extrusion barrel (31) and a twin screw (32) disposed in the extrusion barrel (31); A screw driving unit (33) connected to one end of the twin screws (32) to drive the twin screws (32) to operate; A temperature control unit (34) is disposed on the outer periphery of the extrusion cylinder (31) and controls the temperature of the extrusion cylinder (31); A heating module, providing heat energy to the temperature control part (34); A controller connected to the screw drive unit (33), the temperature control unit (34), and the heating module; The temperature control portion (34) is provided with a plurality of temperature control sections (341) in sequence along the conveying direction of the extrusion barrel (31), and each of the temperature control sections (341) performs temperature control and heating respectively.

2. The melt extrusion device according to claim 1, characterized in that: The temperature control portion (34) comprises 5 to 10 temperature control sections (341).

3. The melt extrusion device according to claim 2, characterized in that: The extrusion barrel (31) is provided with a natural exhaust port (311) in the middle, and a vacuum exhaust port (312) at the rear end, and the vacuum exhaust port (312) is connected to a vacuum pump via a pipeline.

4. The melt extrusion device according to claim 1, characterized in that A detachable extrusion head (35) is provided at the rear end of the extrusion cylinder (31).

5. The melt extrusion device according to claim 1, characterized in that: The heating module is a resistance heater or an induction heater, which is respectively arranged in each of the temperature control sections (341); Alternatively, the heating module is a thermal oil heater, which is connected to each of the temperature control sections (341) via pipelines.

6. The melt extrusion device according to claim 5, characterized in that It also includes a water cooling circulation module connected to the controller, and the water cooling circulation module is respectively connected to each of the temperature control sections (341).

7. The melt extrusion device according to claim 6, characterized in that: Each of the temperature control sections (341) is provided with a temperature probe, and the temperature probe is connected to the controller.

8. A system for preparing a wastewater denitrification carrier, characterized in that: include: The melt extrusion device (3) according to any one of claims 1 to 7; A powder mixing device (1) is arranged before the melt extrusion device (3); A first feeding device (2) connected to the discharge port of the powder mixing device (1) and the feed port of the melt extrusion device (3); A cooling and cutting device (4), arranged after the melt extrusion device (3), for cooling and cutting the extruded material; A screening device (5), arranged after the cooling and cutting device (4), and used for screening; The second feeding device (6) is connected to the undersize of the screening device (5) and the first feeding device (2), and recovers the undersize material to the first feeding device (2).

9. The system for preparing a wastewater denitrification carrier according to claim 8, characterized in that: It also comprises a crusher (7), which is arranged between the cooling and cutting device (4) and the screening device (5) and is used to crush the coarse carrier formed by cooling and cutting.

10. The system for preparing a wastewater denitrification carrier according to claim 8, characterized in that: The cooling and cutting device (4) comprises a cooling water tank (41), an air dryer (42) and a pelletizer (43).

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